CN102013251A - Acoustic resonance device - Google Patents

Abstract

An acoustic resonance device is installed in a compartment of a vehicle so as to reduce a low-frequency sound pressure (or noise) dependent upon a natural vibration. Specifically, an acoustic resonance device is a panel/diaphragm resonator, a resonance pipe, or a Helmholtz resonator, the inner space of which communicates with the compartment via an opening. The acoustic resonance device is positioned in proximity to an antinode of sound pressure owing to a natural vibration occurring in a driver/passenger space inside the compartment. Alternatively, the acoustic resonance device increases a particle velocity at a specific natural frequency or decreases sound pressure at an excitation frequency which occurs due to an external condition of the vehicle. The acoustic resonance device can be installed in a roof, a seat, a pillar supporting the roof, or a door of a vehicle.

Description

Acoustics sympathetic response device

The cross reference of correlation technique

The application requires the right of priority of Japanese patent application 2009-206496 number, and its content is incorporated herein by reference.

Technical field

The present invention relates to reduce the acoustics sympathetic response device of sound/noise in vehicle passenger cabin/compartment.

Background technology

Developed various technology traditionally, improved peace and quiet/noise-free environment in vehicle passenger cabin/compartment by adopting acoustic absorbant.Patent documentation 1 discloses a kind of acoustic absorbant (for example felt materials) on the airduct in the instrument panel in the vehicle passenger cabin that is attached to.Patent documentation 2 discloses a kind of plate/film sound absorption structure, and wherein plate/film Vib. and back cavity (or the air chamber in the Vib. rear portion) cooperatively interact to absorb sound.

Even the technology of patent documentation 1 has been taked the sound absorption structure of patent documentation 2, also be difficult to fully to reduce car engine sound and (friction during owing to vehicle ' between tire and the road produces) low-frequency sound that frictional noise brought.The technology of patent documentation 1 can actually hear that driver and/or passenger the seat position place of sound/noise in the vehicle can not demonstrate the high acoustic absorption effect.

Patent documentation 1: Japanese Patent Application Publication 2001-97020 number

Patent documentation 2: Japanese Patent Application Publication 2006-11412 number

Summary of the invention

An object of the present invention is to provide a kind of acoustics sympathetic response device, it reduces low-frequency sound, thereby demonstrates acoustically effective driver and/or the actual seat position place of sound/noise in the vehicle that hears of passenger.

Acoustics sympathetic response device according to the present invention is installed in the compartment of vehicle, and is made of at least one acoustic resonance device with inner space and opening.Acoustic resonance device is arranged in the compartment of vehicle so that its inner space communicates with the compartment by opening.Acoustic resonance device has reduced the acoustic pressure at specific natural frequency place, and described specific natural frequency is corresponding to the antinode of the proper vibration that occurs in the driver/passenger space of vehicle car inside.

Preferably, its position was approached the acoustic pressure at the proper vibration antinode place of driver/passenger space most among acoustic resonance device was located a plurality of antinodes of the natural frequency that reduces to take place in vehicle car.

In addition, acoustic resonance device has increased the particle rapidity with the corresponding specific natural frequency of the antinode of the proper vibration that occurs place in the driver/passenger space of vehicle car inside.

And, the acoustic pressure at that acoustic resonance device has reduced to occur owing to the outside vehicle condition and different excitation frequency place with specific natural frequency.

Hereinbefore, proper vibration is a main vibration mode (primary mode of vibration) of propagating acoustic pressure on vehicle-width direction.Replacedly, proper vibration is a less important vibration mode (secondary mode ofvibration) of propagating acoustic pressure on the vehicle fore-and-aft direction.

In the seat that acoustic resonance device can be installed in the vehicle car with driver/passenger space is associated.Acoustic resonance device can be installed in the roof of vehicle.Acoustic resonance device can be installed in the post of support vehicle roof.Acoustic resonance device can be installed in the door of vehicle.

Generally speaking, driver/passenger's low-frequency sound that can obviously be felt as noise largely depends on the proper vibration that occurs in the compartment of vehicle.Consider the proper vibration that occurs at the height place that equals driver on the front stall/head of passenger position, wavelength is approximately the twice of vehicle width, thereby acoustic pressure is propagated on the Width of vehicle.The antinode of the acoustic pressure that proper vibration causes appears near the side window of vehicle Qianmen upper fixed.Therefore, acoustics sympathetic response device locatees the acoustic pressure that approaches the acoustic pressure antinode place of driver/passenger space among a plurality of antinodes of the acoustic pressure that proper vibration is caused most to reduce, or the particle rapidity at this place is increased, thereby implementation pattern suppresses.That is, the present invention can reduce low-frequency sound pressure, thereby and improves at the actual noise reduction effect that suffers the driver/passenger position place of noise effect of driver/passenger.

Description of drawings

With reference to the following drawings, these and other objects of the present invention, aspect and embodiment will be described in more detail.

Fig. 1 illustrates the skeleton view that is equipped with according to the outward appearance of the vehicle of the acoustics sympathetic response device of first embodiment of the invention.

Fig. 2 is part illustrates associated mechanical part in compartment and the vehicle with section a side view.

Fig. 3 is the skeleton view that illustrates as the outward appearance of the plate/film acoustic resonance device of the acoustics sympathetic response device of first embodiment.

Fig. 4 is the cross-sectional view along the intercepting of the line II-II among Fig. 3.

Fig. 5 A is the skeleton view at the front stall back side on the interior diagonal of vehicle.

Fig. 5 B is the curve map that the proper vibration that acoustic pressure wherein propagates on the box width direction is shown.

The schematically illustrated details of testing of Fig. 6 about the measurement of vibration two-dimensional model.

Fig. 7 is the curve map that the measurement test result that is illustrated in each acoustic pressure of estimating the position is shown.

Fig. 8 is the perspective exploded view that roof is equipped with the vehicle of plate/film acoustic resonance device.

Fig. 9 is the skeleton view that is illustrated in the front stall back side on the interior diagonal of the vehicle that is equipped with plate/film acoustic resonance device.

Figure 10 is the cross-sectional view along the intercepting of the line VIII-VIII among Fig. 2, shows the formation of the roof that is equipped with plate/film acoustic resonance device.

Figure 11 is the cross-sectional view of the center pillar that cuts in the plane perpendicular to length direction.

Figure 12 A is the transverse cross-sectional view along the intercepting of the line A-A on the front stall among Fig. 9.

Figure 12 B is the longitudinal sectional drawing along the intercepting of the line B-B on the front stall among Fig. 9.

Figure 13 is the longitudinal sectional drawing at the Qianmen of cutting in the plane perpendicular to vehicle-width direction.

Figure 14 A is the front elevation of the resonance tube unit that is made of a plurality of resonance tubes that acoustic pressure is decayed.

Figure 14 B illustrates to combine to cause the cross-sectional view of the inner structure of two adjacent resonance tubes of coupled oscillations between the two.

Figure 15 is the decomposition diagram that roof is equipped with the vehicle of resonance tube unit.

Figure 16 is the skeleton view that is equipped with rear portion of front stall on diagonal, vehicle car inside of resonance tube unit.

Figure 17 is the cross-sectional view along the intercepting of the line VIII-VIII among Fig. 2, shows the formation of the roof that is equipped with the resonance tube unit.

Figure 18 is along the front pillar cross-sectional view of the intercepting of the line D-D among Figure 16, shows the installation of resonance tube unit.

Figure 19 is the skeleton view of part with the Qianmen that is equipped with the resonance tube unit shown in the section.

Figure 20 A is the skeleton view that illustrates as according to helmholtz (Helmholtz) acoustic resonance device of the acoustics sympathetic response device of third embodiment of the invention.

Figure 20 B is the cross-sectional view of the helmholtz acoustic resonance device that is made of main body and tubular portion.

Figure 21 is along the cross-sectional view of the intercepting of the line VIII-VIII among Fig. 2, and the formation that also is equipped with the roof of helmholtz acoustic resonance device except plate/film acoustic resonance device is shown.

Figure 22 is the curve map that the frequency characteristic of acoustic pressure is shown, and has shown that the noise aspect the A characteristic acoustic pressure that is brought by acoustic resonance device reduces effect.

Figure 23 A is the cross-sectional view according to the tubular portion of secondary vibration in the helmholtz acoustic resonance device.

Figure 23 B is the planimetric map of the tubular portion that is made of outer tube, interior pipe and opening.

Figure 24 A is the decomposition diagram of grill member that is attached to the roof inner panel of vehicle.

Figure 24 B is the side view of grill member on direction F among Figure 24 A.

Thereby Figure 25 illustrates the curve map to the analog result of plate/membranaceous acoustic resonance device that calculates the relation of acoustical absorption coefficient and frequency by the different surfaces density that adopts Vib..

Figure 26 is the skeleton view according to the accordion plate of the 5th modification.

Embodiment

By embodiment and modification the present invention is described in further detail with reference to the accompanying drawings.

1, first embodiment

Fig. 1 illustrates the skeleton view that is equipped with according to the outward appearance of the vehicle 100 (being four-door sedan) of the acoustics sympathetic response device of first embodiment of the invention.Main cabin/the compartment 105 of the schematically illustrated vehicle 100 of Fig. 2.Here, 101, four doors 150 of hood (bonnet) (as the access doors in compartment 105) and boot door 103 are installed on the chassis (as the skeleton of vehicle 100) in the opening/closing mode.The chassis of vehicle 100 comprises the part (being supported by these posts) of base plate 104, center pillar 120 (extending upward from base plate 104), front pillar 130 and rear pillar 180 and roof 110.Compartment 105 is limited by each door 150 in the vehicle 100.Compartment 105 is interior spaces of holding the driver/passenger who enters vehicle 100.At the rear portion of vehicle 100 Rear Parcel Shelf 220 has been installed.Rear Parcel Shelf 220 has covered the dividing plate (not shown) that is between compartment 105 and the luggage case.As shown in Figure 2, the front portion of vehicle 100 corresponding to vehicle 100 forwards to (or travel direction), and the rear portion of vehicle 100 is corresponding to the backward directions of vehicle 100.

Compartment 105 comprises driver and/or passenger residing driver/passenger space in vehicle 100.With known automotive interior structural similarity, the driver/passenger space in compartment 105 comprises front stall 140 and back seat 190.Particularly, front stall 140 comprises operating seat 140A and its adjacent seats 140B.Hold the driver and/driver/passenger space in passenger's compartment 105 pre-determines in the design phase.Four doors 150 comprise two Qianmen 150A that install near front stall 140 and two back door 150B that install near back seat 190.Door 150 is equipped with side window 153.When side window 153 was closed as shown in Figure 1, it was arranged in the tip position of Qianmen 150A.

Acoustics sympathetic response device has been installed so that reduce low-frequency sound in the compartment 105 in vehicle 100.Acoustics sympathetic response device comprises the acoustic resonance device that resonates with the sound in the decay compartment 105.First embodiment has adopted plate/film acoustic resonance device to be used for acoustics sympathetic response device.

The outward appearance of the schematically illustrated plate of Fig. 3/film acoustic resonance device 1.Fig. 4 is the cross-sectional view along the intercepting of the line II-II among Fig. 3, shows the inside of plate/film acoustic resonance device 1.

Plate/film acoustic resonance device 1 is divided into shell 10 and Vib. 15 basically.Shell 10 is that the rectangular parallelepiped parts as opening 12 are opened on a top.Shell 10 is made of opening 12 and rectangular parallelepiped cavity 13 (i.e. the hollow space that communicates with opening 12).Shell 10 is made by timber; But this is not restriction.That is, shell 10 can be made by harder hard material (as synthetic resin and metal) by the material of ratio vibrator 15.Vib. 15 is as plate or film and so on rubber-like rectangular parallelepiped parts.For example, Vib. 15 is to be made by the resilient material that causes elastic vibration, and such as synthetic resin, metal and fiberboard, perhaps Vib. 15 is films of being made by resilient material or polymer composites.The edge on a surface of Vib. 15 is supported by shell 10, thus the opening 12 of Vib. 15 closures 10.Because the opening 12 of shell 10 is covered by Vib. 15, has therefore formed cavity 13 in plate/film acoustic resonance device 1 inside.In fact cavity 13, is the air chamber that comprises gas molecule as the layer of being made up of gas molecule.

In compartment 105, plate/film acoustic resonance device 1 is arranged so that it communicates with a space of standing sound attenuating.In other words, the cavity 13 of plate/film acoustic resonance device 1 is arranged in the space of standing the acoustic pressure that need be attenuated.When producing sound in this space, plate/1 pair of acoustic pressure of film acoustic resonance device produces resonance.Because resonance, between the inside acoustic pressure of the cavity 13 of the acoustic pressure in this space and plate/film acoustic resonance device 1, produce pressure differential.Pressure differential causes Vib. 15 vibrations, thus sound energy consumption; Then, acoustic energy radiation once more.Work on this surface that operates in plate/film acoustic resonance device 1, make that the acoustic pressure near the Vib. 15 the space reduces.

The frequency that resonance by plate/film acoustic resonance device 1 reduces acoustic pressure depends on the resonant frequency of the spring-quality system of mass component (being the weight of Vib. 15) based on cavity 13 and elastic component.The vibration of spring-quality system is called " piston vibration ".Because rubber-like Vib. 15 has little area, therefore, because being supported and the elastic vibration at confined part place by shell 10 of Vib. causes additional bending system character.That is, plate/film acoustic resonance device 1 has Vib. 15 that stands " crooked vibration " and the cavity 13 that is arranged in Vib. 15 back sides.

Next, will the condition that be provided with of the plate/film acoustic resonance device 1 relevant with the crooked resonant frequency that vibrates with the resonant frequency of piston vibration be described.

Express the resonant frequency f that piston vibrates, wherein ρ by equation (1) ₀[kg/m ³] density of expression gas medium, i.e. atmospheric density; c ₀[m/s] representative voice speed; ρ [kg/m ³] represent the density of Vib.; T[m] represent the thickness of Vib.; And L[m] represent the thickness of air layer.

$f=\frac{1}{2\mathrm{\&pi;}}\{\frac{{\mathrm{\&rho;}}_0{\mathrm{<figure-callout\; id="0"\; label="c"\; filenames="HSA00000262321100171.png"\; state="\{\{state\}\}">c</figure-callout>}}_0^2}{\mathrm{\&rho;tL}}{\}}^{1/2}---\left(1\right)$

Piston vibration and the crooked resonant frequency f that vibrates the two are expressed by equation (2), and wherein Vib. is a rectangle, and a rectangular edge lengths is " a " [m], and another side length is " b " [m]; E[Pa] represent the Young modulus of Vib.; σ [-] represents the Poisson ratio of Vib.; And p, q are the positive integers of expression mode hierarchies (mode degree).This resonant frequency f adopts in building acoustics design once in a while.

$f=\frac{1}{2\mathrm{\&pi;}}{\{\frac{{\mathrm{\&rho;}}_0{\mathrm{<figure-callout\; id="0"\; label="c"\; filenames="HSA00000262321100171.png"\; state="\{\{state\}\}">c</figure-callout>}}_0^2}{\mathrm{\&rho;tL}}+\left[{{\left(\frac{p}{a}\right)}^2+{\left(\frac{q}{b}\right)}^2]}^2\right[\frac{{\mathrm{\&pi;}}^4{\mathrm{<figure-callout\; id="3"\; label="Et"\; filenames="HSA00000262321100131.png,HSA00000262321100132.png"\; state="\{\{state\}\}">Et</figure-callout>}}^3}{12\mathrm{\&rho;t}(1-{\mathrm{\&sigma;}}^2)}]\}}^{1/2}---\left(2\right)$

As mentioned above, plate/film acoustic resonance device 1 has caused the resonance and because the resonance that crooked vibration causes that are caused by piston vibration.Here, piston vibration and crooked vibration are not to take place independently of each other.When they resonant frequency mutually near the time, the resonance of spring-quality system and the resonance of bending system are cooperated mutually, have determined total resonant frequency of plate/film acoustic resonance device 1.When the resonant frequency of the resonant frequency of spring-quality system and bending system not simultaneously, they are operated independently of each other and they can partly influence each other simultaneously.For this reason, the fundamental oscillation of bending system becomes phase-splitting to cooperate with the spring of backside cavity, make to have driven significantly vibration in the frequency band between the fundamental frequency of the resonant frequency of spring-quality system and bending system, thus the decay that has increased acoustic pressure.

The plate of first embodiment/film acoustic resonance device 1 is worked satisfactorily and has been reduced acoustic pressure in the frequency band that its centre frequency is arranged on low relatively resonant frequency place.We have done various tests at (being the present inventor), wherein express the fundamental frequency fa of bending system with equation (3), and express the resonant frequency fb of spring-quality system with equation (1).We find that plate/film acoustic resonance device 1 of regulating parameter according to equation (4) can fully reduce acoustic pressure.

$\mathrm{fa}=\frac{1}{2\mathrm{\&pi;}}\{{\left(\frac{p}{a}\right)}^2+{\left(\frac{q}{b}\right)}^2\}\&CenterDot;{\left\{\frac{{\mathrm{\&pi;}}^4{\mathrm{<figure-callout\; id="3"\; label="Et"\; filenames="HSA00000262321100131.png,HSA00000262321100132.png"\; state="\{\{state\}\}">Et</figure-callout>}}^3}{12\mathrm{\&rho;t}(1-{\mathrm{\&sigma;}}^2)}\right\}}^{1/2}---\left(3\right)$

$0.05\&le;\frac{\mathrm{fa}}{\mathrm{fb}}\&le;0.65---\left(4\right)$

Because the fundamental oscillation of bending system and the spring composition of the air chamber at the back side are cooperated mutually and are made and driven violent oscillatory motion in the frequency band between the fundamental frequency of the fundamental frequency of piston vibration and crooked vibration, therefore cause such resonance effect: (fundamental frequency of crooked vibration) fa＜(crest frequency that acoustic pressure decays) f＜(fundamental frequency that piston vibrates) fb.This makes plate/film acoustic resonance device 1 give off anti-phase reflection wave, thereby has reduced the lip-deep acoustic pressure of Vib. 15.

When the above-mentioned parameter with plate/film acoustic resonance device 1 is conditioned when satisfying equation (5), to compare with the fundamental frequency of piston vibration, the crest frequency of acoustic pressure decay further reduces.

$0.05\&le;\frac{\mathrm{fa}}{\mathrm{fb}}\&le;0.40---\left(5\right)$

In order fully to reduce the acoustic pressure in (corresponding to the centre frequency of 1/3rd octaves) from 160Hz to the 315Hz frequency range, plate/film acoustic resonance device 1 need be provided with above-mentioned parameter, such as ρ ₀=1.225[kg/m ³], c ₀=340[m/s], ρ=940[kg/m ³], t=0.0017[m], L=0.03[m], a=b=0.1[m] and, E=1.0[GPa], σ=0.4, and p=q=1.

Next, the method that detailed description is used for the installation site of definite plate/film acoustic resonance device 1.Fig. 5 A is the skeleton view that the back diagonal is observed the front stall 140A of its center in compartment 105, and Fig. 5 B is the curve that is illustrated in the proper vibration that (corresponding to the transverse width of vehicle 100) propagated on the Width in the compartment 105 (or normal mode of vibration).The curve of Fig. 5 B is illustrated in the distribution about the acoustic pressure in the dimensional pattern of the vibration of standing wave (or axial wave), and in described standing wave, acoustic pressure is propagated on the Width of vehicle 100.The wavelength of axial wave is roughly the twice of the width in compartment 105.The width in compartment 105 is depended in proper vibration, and wherein the natural frequency in compartment 105 for example is low relatively 167Hz.The position of the transverse axis presentation graphs 5A dotted line H of the curve of Fig. 5 B promptly be sitting in the people's at front stall 140 places the height of head (or ear), and Z-axis is illustrated in the acoustic pressure under the one dimension mode vibration.

The low frequency that inventor hypothesis is in about the 170Hz that people in the compartment 105 can be identified as it noise depends primarily on proper vibration.Put it briefly, most patterns of vibration concentrate in the audio frequency range in the diffuse sound field; Therefore, acoustic pressure is evenly propagated in sound field, shows the even distribution of the sound field of each position in the sound field on frequency axis clearly.In contrast, some vibration modes that are difficult to decay appear in the sound field in little space in compartment 105 and so on of vehicle 100 for example.In other words, in compartment 105, some vibration modes are disconnected from each other on frequency axis.At low natural frequency place, in compartment 105, the antinode of acoustic pressure is propagated in the mode of rarefaction wave (rarefactional); Therefore, the acoustic pressure antinode can appear at the ad-hoc location of sound field, and comparing with other position greatly in the acoustic pressure of this specific location increases.The clastotype of vibration demonstrates the high acoustic energy that is difficult to decay corresponding to a dimensional pattern (causing axial wave) of vibration.Compare with other pattern of vibration, a dimensional pattern of vibration causes a small amount of incident of sound wave on metope in the time per unit, makes acoustic energy seldom be absorbed by metope.

We have found a kind of simple solution that the sound at specific natural frequency place in the little sound field is decayed, and wherein need to specify the corresponding position of antinode with the acoustic pressure of specific natural frequency, and reduce acoustic pressure wherein.This solution has reduced the low-frequency sound in the little sound field effectively.In other words, when having specified when carrying out the acoustic pressure decay, can weaken the proper vibration in the sound field corresponding to the position of the antinode of proper vibration and to it.Can adopt acoustic resonance device as the component parts that is used to reduce acoustic pressure, wherein the opening of acoustic resonance device is positioned near the position of acoustic pressure antinode.Here, term " near " be meant the distance that satisfies the needs reduce antinode place acoustic pressure.Small distance can reduce the acoustic pressure at specific natural frequency place, wherein can this distance be set to the sixth of wavelength for example or littler.

We carry out following measurement test, to confirm whether really reduced low-frequency sound pressure in the little sound field by above-mentioned principle of work.

Fig. 6 shows the details of measuring test, the proper vibration that its schematically illustrated wherein acoustic pressure is propagated on the short transverse of rectangular parallelepiped sound field.Specifically, Fig. 6 illustrates the two-dimensional model of vibration, wherein produces the low natural frequency of 158Hz owing to the height dimension of sound field.Diagonal line hatches partly represents to occur the position of maximum sound pressure or the position that acoustic pressure increases the biglyyest; Therefore, these positions are corresponding to the antinode of acoustic pressure.Other dash area with perpendicular line represents to occur the position of minimum acoustic pressure or the position that acoustic pressure reduces minimumly; Therefore, these positions are corresponding to the node of acoustic pressure.Other blank parts (or unblanketed part) expression acoustic pressure remains on the position of by-level.The mode of the simulation of acoustic field by adopting finite element method (FEM) is come the two-dimensional model of the vibration of calculating chart 6.

We have specified 15 circular marks of numbering from " 1 " to " 15 " as estimating the position, measure acoustic pressure in these positions.Estimate the position at each and arrange a microphone.Arrange evaluation position 1 to 9 along the edge line that on the sound field short transverse, extends, wherein arrange these positions with equidistant from distance.Along the edge line position 9 to 15 that on sound field Width or baseline, extends, wherein arrange these positions with equidistant from distance.Estimate the place, an angle that position 9 is set at sound field, and auditory localization is being located from estimating angle farthest, position 9.

Fig. 7 is the curve map that the result who measures test is shown, and produces thereby the sound that this curve negotiating sends from sound source with microphone reception that is arranged in each evaluation position detects the mode of acoustic pressure.In Fig. 7, position 1 to 15 is estimated in horizontal line representative, and perpendicular line representative and centre frequency are that unit is the acoustic pressure of decibel (dB) in the corresponding 160Hz frequency band of 1/3rd octave bands of 160Hz.Here, solid line representative is by decayed at the antinode place of the proper vibration measurement result A of acoustic pressure of sympathetic response mode, and wherein, the place, four angles of the horizontal plane that evaluation position in its height and sound field 5 is corresponding arranges four acoustic resonance device.Specifically, each four acoustic resonance device that all have an openend (communicating with its cavity) and another sealing end is arranged and makes its openend be positioned four angles.The predetermined resonance frequencies place of each acoustic resonance device in the 160Hz frequency band resonates.Dotted line representative is by decayed at the node place of the proper vibration measurement result B of acoustic pressure of sympathetic response mode, wherein, arranges four acoustic resonance device at the place, four angles of its height horizontal plane corresponding with estimating position 7.The measurement result C of acoustic resonance device is not arranged in the dot-and-dash line representative.

Measurement result A (seeing the solid line among Fig. 7) clearly illustrates in evaluation position 5 place's acoustic pressures corresponding with the antinode of proper vibration and that approach the acoustic resonance device openend and reduces greatly that wherein acoustic pressure is reduced to about 62dB.At the evaluation position 3,4,6 and 7 places that approach to estimate position 5, acoustic pressure is about 90dB; Therefore, this acoustic pressure is less than the measurement result C (seeing the dotted line among Fig. 7) that does not use acoustic resonance device and produced.At 8 to 15 places, evaluation position away from the acoustic resonance device position, the measurement result C that the acoustic pressure ratio does not use acoustic resonance device and produced hangs down about 20dB.Above-mentioned measurement result A illustrates, and adopts acoustic resonance device can reduce the acoustic pressure at the antinode place of proper vibration greatly, also can reduce in the acoustic pressure away from other position of acoustic resonance device position.This proof acoustic resonance device can improve the peace and quiet/noise-free environment in the sound field that produces in vehicle car.This effect can be called " mode suppression effect " hereinafter.

Measurement result B (seeing the dotted line among Fig. 7) clearly illustrates in evaluation position 7 place's acoustic pressures corresponding with the node of proper vibration and that approach the openend of acoustic resonance device and reduces greatly that wherein this acoustic pressure is reduced to about 76dB.On the contrary, C compares with measurement result, and estimating the position at other does not have discovery mode to suppress effect.Measurement result C shows, adopts the acoustic resonance device at the node place that is arranged in proper vibration can not fully reduce acoustic pressure; Therefore, it is very difficult to obtain the mode suppression effect in sound field.

With reference to Fig. 5 A that a dimensional pattern of vibration is shown, wherein acoustic pressure is propagated on the Width in compartment 105 again, and we find that the antinode of acoustic pressure appears near the height of the driver/passenger's who is sitting in front stall 140A/140B head (or ear).Antinode may appear near the opposite end on the Width in compartment 105, and wherein they can approach the side window 153 of Qianmen 150A.Wavelength corresponding to the natural frequency of proper vibration may be the twice of the width in compartment 105.For example, the wavelength of natural frequency 167Hz is about 2.0m, and the width range in compartment 105 is from 0.8m to 1.5m in the vehicle of common size.

The standing wave of near the acoustic pressure antinode of the generation side window 153 in the compartment 105 that is subjected to normal mode vibration needn't be via Width, propagating (or axial wave) and taking place.We can estimate that the antinode of sound wave can take place via depending on the propagating the axial wave of acoustic pressure on Width of one dimension mode vibration.Say that strictly the antinode of acoustic pressure is relevant with the axial wave that (see figure 2) on the fore-and-aft direction of vehicle 100 is propagated acoustic pressure; In other words, the antinode of acoustic pressure may take place owing to the tangential wave that depends on the two-dimensional model vibration.In addition, the antinode of acoustic pressure may take place owing to the oblique wave (slanted wave) that depends on the three dimensional pattern vibration, and the vibration of this three dimensional pattern is relevant with the axial wave of propagating acoustic pressure on the short transverse in compartment 105.Do not consider the type of related vibration, we find such fact, and the antinode of the acoustic pressure that proper vibration causes appears near front stall 140 and the side window 153.

In compartment 105, the vibration mode of a plurality of separation occurs on the frequency axis in the low-frequency range (especially at the 160Hz frequency band), makes acoustic pressure be actually to propagate according to those vibration modes in sound field.We find that among the vibration mode of those separation, certain certain vibration pattern (seeing Fig. 5 B) of propagating acoustic pressure on Width need be suppressed, so that realize that noise reduces effect preferably in compartment 105.Promptly, when according to driver/passenger position and definite and when near the antinode of the proper vibration that occurs front stall 140 and the side window 153 is controlled selectively in sound field, can improve greatly driver/passenger and hear that the noise of the position of sound reduces effect.Consider the internal specifications of vehicle 100, be necessary in front stall 140 or the selected location place that approaching the inside surface of the front stall 140 in the compartment 105 embeds acoustic resonance device with known configurations and size.

The material and the shape in compartment 105 depended in the position of the antinode of proper vibration; Therefore, can just easily measure this position by unactual steering vehicle 100.In practice, the loudspeaker of sound to be measured from be installed in known vehicle car with preset frequency sends, and is disposed in the microphone reception of pre-position in the compartment; Then, detect acoustic pressure, thereby the acoustic pressure that produces shown in Fig. 5 B distributes according to the measurement result of sound to be measured.Put it briefly, conventional truck adopts the compartment of similar shape and size; Therefore, we can say that the antinode of acoustic pressure is to occur near the front stall in being subjected to the driver/passenger space of proper vibration.

Next, detailed description is arranged in the location of the plate/film acoustic resonance device 1 in the compartment 105.The location of plate/film acoustic resonance device 1 is provided to the 160Hz frequency band implementation pattern based on proper vibration is suppressed.Specifically, the resonant frequency of plate/film acoustic resonance device 1 is provided to consistent generally with natural frequency.

Fig. 8 is the decomposition diagram of vehicle, and Fig. 9 is the skeleton view that central authorities are illustrated in the back side of the oblique front stall 140A that looks in the compartment 105.In the present embodiment, on a plurality of plates/film acoustic resonance device 1 each position attached to vehicle 100 inside.Particularly, plate/film acoustic resonance device 1 is attached to roof 110, center pillar 120, front pillar 130, front stall 140 and Qianmen 150A.Among them, roof 110, center pillar 120, front pillar 130 and Qianmen 150A are the ingredients in compartment 105.Plate/film acoustic resonance device 1 is located the acoustic pressure with the antinode place that reduces to occur nearby in the compartment 105 that is subjected to proper vibration.Specifically, they be positioned in the antinode of proper vibration in about small distance (for example 30cm) scope corresponding to the natural frequency wavelength.Each plate/film acoustic resonance device 1 all is positioned and makes cavity 13 communicate with compartment 105 via opening 12.

In the following description, term " upside " is illustrated in the higher position on the short transverse in compartment 105, and " downside " is illustrated in the lower position on the short transverse in compartment 105.The left-hand component of term " left side " expression vehicle 100 on travel direction, and the right-hand component of " right side " expression vehicle 100 on travel direction.In addition, the position of side window 153 is meant the upper end of the side window 153 of closing, wherein its highly approximately and the actual driver/passenger's who is sitting in front stall 140 height consistent.

Next, the formation of roof 110 will be described in detail.Figure 10 is the cross-sectional view along the intercepting of the line VIII-VIII among Fig. 2, shows the roof 110 of vehicle 100.

As Fig. 8 and shown in Figure 10, plate/film acoustic resonance device 1 is positioned on the ceiling, just in time driver/the passenger space in front stall 140A and 140B above roof 110 among.Specifically, two groups of plates/film acoustic resonance device 1 (three every group) of arranging linearly on the fore-and-aft direction of vehicle 100 is embedded in the roof 110.Because the antinode of acoustic pressure appears at the place, high position of the side window 153 that approaches Qianmen 150A, therefore plate/film acoustic resonance device 1 need be arranged in the roof 110.On the Width of vehicle 100, each of plate/film acoustic resonance device 1 is all located and is made Vib. 15 approach side window 153 location.

Roof 110 is attached on the part as the chassis of the basic structure of vehicle 100, and wherein roof 110 comprises the roof inner panel 114 that is made of acrylic resin.Roof inner panel 114 has the baseplate material of being made by wood-fiber board 111.Arranged surfacing 112 near the roof inner panel 114 in compartment 105, this surfacing 112 constitutes by allowing acoustic pressure therefrom to propagate the cloth material that passes through.Plate/film acoustic resonance device 1 is embedded within the recess 113 on the upper surface that is formed at baseplate material 111, wherein plate/film acoustic resonance device 1 by adhesive to roof inner panel 114.The fixation that is used for plate/film acoustic resonance device 1 is fixed in roof inner panel 114 need not be confined to bonding agent; Therefore, can adopt other fixation, such as screw, nut, belt etc.In brief, can take to be suitable for any fixation of between plate/film acoustic resonance device 1 and roof inner panel 114, fixing.Each all is attached to baseplate material 111 plate/film acoustic resonance device 1, and Vib. 15 is communicated by the inner space of surfacing 112 with compartment 105.In addition, other plate/film acoustic resonance device 1 embeds and also is fixed within the recess 115 that the opposite two ends on the Width of roof inner panel 114 forms, and wherein they are embedded near the sloping portion of the ceiling the side window 153.Specifically, plate/film acoustic resonance device 1 is positioned near the handrail 200, and handrail attaches to the sidepiece near the driver/passenger position in the vehicle 100 with known configurations of ceiling.In the time of near plate/film acoustic resonance device 1 is positioned at handrail 200, Vib. 15 is positioned to very close side window 153, has therefore further improved the sound attenuation to the acoustic pressure antinode.Plate/film the acoustic resonance device 1 that embeds in the roof 110 has been realized the mode suppression to proper vibration effectively.

Next, the formation of center pillar 120 and the formation of front pillar 130 will be described in detail.Figure 11 is at the cross-sectional view perpendicular to the center pillar 120 that cuts down in the plane longitudinally.Center pillar 120 is made of center pillar outside plate 121 (as the part on chassis) and center pillar inner panel 122 (being fixed to center pillar outside plate 121 by pin 122A).The surfacing 123 that is made of the cloth material that allows acoustic pressure therefrom to propagate to pass through is attached near the interior section compartment 105 of being positioned at of center pillar inner panel 122.

Plate/film acoustic resonance device 1 is embedded in the center pillar 120, make Vib. 15 in the face of center pillar inner panel 122.On the interior section of center pillar inner panel 122, form a plurality of holes 124.The sound that produces in compartment 105 arrives the Vib. 15 of plate/film acoustic resonance device 1 by hole 124.As shown in Figure 9, center pillar 120 be arranged in front stall 140A and Qianmen 150A near.Plate/film acoustic resonance device 1 in the embedding center pillar 120 has effectively been realized the mode suppression in the compartment 105.

Fig. 9 shows another plate/film acoustic resonance device 1 that embeds in the front pillar 130, and wherein its fixed sturcture is similar to above-mentioned being used for plate/film acoustic resonance device 1 is fixed on the structure within the center pillar 120.Since front pillar 130 be arranged in front stall 140A and Qianmen 150A near, therefore embed plate/film acoustic resonance device 1 in the front pillar 130 and effectively realized mode suppression in the compartment 105.

Next, the formation of front stall 140 will be described in detail.Figure 12 A is the transverse cross-sectional view along the intercepting of the line A-A on the front stall 140A among Fig. 9, and Figure 12 B is the longitudinal sectional drawing along the intercepting of the line B-B on the front stall 140A among Fig. 9.The surrounding space of front stall 140 has constituted compartment 105.

Front stall 140 is divided into headrest 141 and backrest 142.Headrest 141 is attached to backrest 142 by the leg (not shown) that inserts backrest 142.Regulate the position of headrest 141 with the occipital bone zone of the head that is sitting in driver/passenger in the front stall 140.Headrest 141 supports driver/passenger's head.To fill the headrest bag of making by leather or leatheret 143 such as the filling material of low elasticity isocyanurate foam and so on.Cover headrest bag 143 with headrest cover 144.In backrest 142, to fill backrest bag 145 such as the filling material of isocyanurate foam and so on.Cover the surface of backrest bag 145 with backrest cover 146.Headrest cover 144 and backrest cover 146 are all made by allowing acoustic pressure therefrom to propagate the cloth material that passes through.

Shown in Figure 12 A, embedded two plates/film acoustic resonance device 1 at headrest in 141, make the opposite end of Vib. 15 on the Width in compartment 105.Because the antinode of the acoustic pressure that is caused by proper vibration appears near the side window 153, so the Vib. 15 of plate/film acoustic resonance device 1 needs the location to come antinode near acoustic pressure.Because Vib. 15 is internally arranged to communicate with compartment 105 towards headrest cover 144, therefore is not easy to be seen by driver/passenger.In addition, plate/film acoustic resonance device 1 with respect to headrest 141 location regularly, wherein is fixed to a plurality of legs or frame (not shown) with plate/film acoustic resonance device 1, wherein will rest the head on by these legs or frame 141 is attached to backrest 142.

Shown in Figure 12 B, plate/film acoustic resonance device 1 embeds backrest 142, makes Vib. 15 be positioned at upper surface and a left side/right lateral surface (preferably, at the height that approaches side window 153).The Vib. 15 of plate/film acoustic resonance device 1 arranges internally that towards backrest cover 146 wherein they are not easy to be seen by driver/passenger to communicate with compartment 105.Plate/film acoustic resonance device 1 is fixed on the frame (not shown) of backrest 142, so fix in position.Because the Vib. 15 of plate/film acoustic resonance device 1 is embedded near the side window 153 the front stall 140, therefore can realize the mode suppression in the compartment 105 effectively.Especially, front stall 140 has occupied driver/passenger space in the compartment 105, therefore make can location-plate/film acoustic resonance device 1 Vib. 15.Therefore, improved the actual sound attenuation of hearing the driver/passenger position place of sound greatly driver/passenger.

Even will rest the head on 141 and backrest 142 integral body when forming a seat, also can come installation plate/film acoustic resonance device 1 in the mode of the front stall 140 that is similar to divided type.

Next, the formation of Qianmen 150A will be described in detail.In the present embodiment, plate/film acoustic resonance device 1 is installed among the 150A of Qianmen, and does not have installing plate/film acoustic resonance device in each back door 150B.

Figure 13 is the longitudinal sectional drawing of the Qianmen 150A that cuts down in the plane perpendicular to compartment 105 Widths.

Qianmen 150A has baseplate material 151, and it has installed on the vertical direction of Qianmen 150A movably side window 153.The surfacing of being made by the cloth material that allows acoustic pressure therefrom to propagate to pass through 154 is attached on the inside surface of the baseplate material 151 that defines compartment 105.The baseplate material 151 of Qianmen 150A has the glass storage chamber 151A that deposits side window 153 when side window 153 is opened.The baseplate material 151 of Qianmen 150A has and is arranged in the inner internal space S than glass storage chamber 151A.Installing plate in the 150A of Qianmen/film acoustic resonance device 1 is so that Vib. 15 communicates with internal space S.On the interior section of the baseplate material 151 of Qianmen 150A, form a plurality of holes 155, internal space S is communicated with compartment 105 by hole 155.

Because the sound that produces in the compartment 105 enters internal space S by hole 155, therefore can reduce acoustic pressure in the mode of plate/film acoustic resonance device 1 resonance at the antinode place of proper vibration.With plate/film acoustic resonance device 1 be arranged on appropriate position make Vib. 15 be positioned at side window 153 in the upside that is installed in Qianmen 150A near.In the present embodiment, plate/film acoustic resonance device 1 is positioned in the upside of internal space S, and does not have installation plate/film acoustic resonance device 1 in the downside that approaches 105 floors, compartment of internal space S.

The acoustics sympathetic response device of first embodiment is made of the plate/film acoustic resonance device 1 that is attached on front stall 140 (being positioned at the driver/passenger space in compartment 106) and roof 110, center pillar 120, front pillar 130 and the Qianmen 150A (they are as near the surrounding wall in the compartment 105 driver/passenger space).In compartment 105, be positioned at corresponding to the acoustic pressure antinode of low natural frequency the front stall 140 height place of driver/head of passenger (especially) and Qianmen 150A side window 153 near.Therefore, the next plate/film acoustic resonance device 1 near the acoustic pressure antinode in each location can effectively be realized the mode suppression in the compartment 105.As mentioned above, first embodiment designs and reduces because the sound at the acoustic pressure antinode place of close driver/passenger space among the acoustic pressure antinode that causes of proper vibration.

First embodiment designs the low-frequency sound that reduces in the compartment 105, thereby has improved peace and quiet/noise-free environment, especially the actual peace and quiet/noise-free environment of hearing the driver/passenger position place of sound of driver/passenger.

2, second embodiment

Next, will describe about being installed in the second embodiment of the present invention of the acoustics sympathetic response device (it is made of the resonance tube unit 2 that comprises a plurality of resonance tubes) in the vehicle 100.

Figure 14 A and Figure 14 B show the formation of resonance tube unit 2.Figure 14 A illustrates the outward appearance of the resonance tube unit 2 that is made of five resonance tubes 21 (being that 21-1 is to 21-5).Resonance tube 21 is arranged in the orientation perpendicular to their longitudinal directions, wherein by fixation or bonding agent they is combined into one.Each resonance tube 21 is made by the metal or the synthetic resin of the shape that forms pipe.Each resonance tube 21 is made of blind end 22, openend 23 and hollow space 25; Therefore, it is the pipe with end sealing of an openend and a blind end.Openend 23 linear array of resonance tube 21 are with adjacency.Can seal the neck of the openend 23 of resonance tube 21 with the Fluistor 24 with flow resistance (being gas permeable material) as glass wool, cloth or gauze.During acoustic pressure in reducing hollow space 25, preferably select appropriate material to be used as Fluistor 24.

The sound attenuation of resonance tube unit 2 then, is described with reference to Figure 14 B.

Figure 14 B shows two adjacent resonance tube 21-j and the 21-k (k=j+1 here) that has blind end 22-j, openend 23-j and Fluistor 24-j and blind end 22-k, openend 23-k and Fluistor 24-k in the resonance tube unit 2.Here, L1 represents the length of the hollow space 25 of resonance tube 21-j, and L2 represents the length of the hollow space 25 of resonance tube 21-k, because the hollow space 25 of all resonance tubes 21 has equal length, so L1=L2.When sound wave when the compartment 105 of vehicle 100 incides openend 23-j, the 23-k of resonance tube 21-j, 21-k, they are introduced into hollow space 25 and in blind end 22-j, the reflection of 22-k place, thus they send from openend 23-j, 23-k.At this moment, wavelength X c is that the sound wave of four times (being L1=L2=λ/4) of length L 1, the L2 of hollow space 25 causes standing wave S1, S2.Sound wave in resonance tube 21-j, 21-k inside duration of oscillation back and forth, because the friction on the resonance tube 21-j, 21-k inwall and owing to the glutinousness of openend 23-j, 23-k place air molecule has consumed acoustic energy, thus near openend 23-j, 23-k to having reduced acoustic pressure with the corresponding centre frequency of wavelength X c.In Figure 14 B, for example, length L 1=L2 equals 0.53m, thereby wavelength X c equals 2.12m.

Resonance tube unit 2 is arranged and makes the hollow space 25 of resonance tube 21 communicate with the predetermined space that is subjected to sound attenuating.When receiving sound, 21 pairs of sound that enter openend 23 of resonance tube resonate, in case receive sound, resonance tube 21 resonates with the sound that enters openend 23, so have reduced near the acoustic pressure the openend 23.Here, resonant frequency f is provided with the acoustic pressure that reduces in the 160Hz frequency band; Therefore, the length of the hollow space 25 of resonance tube 21 is set to 1/4th of the wavelength corresponding with frequency 160Hz.That is, the length of the hollow space 25 of resonance tube 21 can be in the scope from 40cm to 80cm for example.

The sound wave that sends in the reflection of blind end 22-j, 22-k place and from openend 23-j, 23-k is at openend 23-j, 23-k diffraction, thereby sends acoustic energy.Part acoustic energy sends and reenters the openend 23 of other adjacent resonance tube 21 from the openend 23 of a resonance tube 21.That is, between adjacent resonance tube 21-j, 21-k, produce coupled oscillations mutually, thereby exchange acoustic energy mutually.During coupled oscillations,, therefore reduced acoustic pressure owing to the friction on the inwall of hollow space 25 and owing to the openend 23-j of resonance tube 21-j, 21-k, the glutinousness of 23-k place air molecule have consumed acoustic energy.This coupled oscillations can be assumed to be the pattern of opposite end sealed tube, and wherein two adjacent resonance tube 21-j, 21-k gang wherein can be with respect to reducing acoustic pressure with the corresponding centre frequency of the wavelength that depends on the L1+L2 total length.

The resonance tube unit 2 of Figure 14 A is made of five pipes 21; But this is not restriction.The quantity of the resonance tube that comprises in the resonance tube unit 2 can at random be set.In the following description, second embodiment is designed to use resonance tube unit 2 that is made of five resonance tubes 21 or the resonance tube unit 2 that only is made of a resonance tube 21.

Next, the structure of the resonance tube unit 2 be used for arranging compartment 105 is described with reference to Figure 15.Being installed in resonance tube unit 2 in the compartment 105 is provided with and locates implementation pattern in preset frequency (being the natural frequency of 160Hz frequency band) and suppress.That is, the resonant frequency of resonance tube unit 2 roughly is set to the natural frequency of proper vibration.

Figure 15 is the decomposition diagram that is equipped with the vehicle 100 of resonance tube unit 2.Figure 16 is the skeleton view that is illustrated in the rear portion of the front stall 140 corresponding with the center, rear portion of front stall 140A of its center on diagonal in the compartment 105 of vehicle 100.As Figure 15 and shown in Figure 16, a plurality of resonance tubes unit 2 has been installed in a plurality of positions in compartment 105, and is similar to the installation site of the plate/film acoustic resonance device 1 of the first embodiment (see figure 9).That is, resonance tube unit 21 embeds among roof 110a, center pillar 120a, front pillar 130a and front stall 140 and the Qianmen 150A.Resonance tube unit 2 arranged make the openend 23 of hollow space 25 of resonance tube 21 communicate with compartment 105.The effect of resonance tube unit 2 is similar to the effect of plate/film acoustic resonance device 1.

Next, the structure of the roof 110a that is used to install resonance tube unit 2 will be described with reference to Figure 17.Figure 17 is the cross-sectional view along the intercepting of the line VIII-VIII among Fig. 2.

As Figure 15 and shown in Figure 17, in the part above the just driver/passenger space on front stall 140A and 140B of the ceiling of resonance tube unit 2 embedding roof 110a.Each resonance tube unit 2 comprises five resonance tubes 21, and the orientation of resonance tube 21 is fore-and-aft directions of vehicle 100.Because the antinode of acoustic pressure appears near the side window 153 of Qianmen 150A, the openend 23 of resonance tube 21 points to side window 153, has therefore improved the sound attenuation at side window 153 places.In other words, resonance tube unit 21 is arranged in 105 inside, compartment, makes the openend 23 of resonance tube 21 point to the contiguous with it inwall on compartments 105 Widths.

As shown in figure 17, in the roof inner panel 114a of roof 110a the openend 23 of the resonance tube 21 of resonance tube unit 2 near formed a plurality of holes 116.These holes 116 communicate with the upper space of roof inner panel 114a top.The sound that produces in compartment 105 enters the openend 23 of resonance tube 21 through via hole 116.Other resonance tube unit 2 is attached to the proper sidepiece at handrail 200 rears of roof inner panel 114a, and wherein each resonance tube unit 2 all is made of the single resonance tube 21 that its length direction is placed along the fore-and-aft direction of vehicle 100.In the sidepiece of roof inner panel 114a, form other hole 117, introduce in the openend 23 of resonance tube 21 with the sound that will produce in the compartment 105.Similar with first embodiment, second embodiment can effectively realize the mode suppression in the compartment 105.

Next, with reference to Figure 18 the formation of center pillar 120a and the formation of front pillar 130a are described.Figure 18 is the cross-sectional view along the center pillar 120a of the intercepting of the line D-D among Figure 16.Center pillar 120a comprises the center pillar inner panel 122a that is attached to center pillar outside plate 121 (seeing Figure 11).Surfacing 123 is attached to the inside surface of the center pillar inner panel 122a the compartment 105 near.Between center pillar inner panel 122a and surfacing 123, form internal space S a.In order to form internal space S a, in the upside of center pillar inner panel 122a, form recess 125, make its rear portion outside outstanding towards vehicle 100 on Width.In the lower end of recess 125, form hole 126.In center pillar 120a, embed resonance tube unit 2, make the openend 23 of resonance tube 21 engage in the hole 126 of recess 125.The sound that produces in compartment 105 enters in the openend 23 of resonance tube 21 by surfacing 123 and internal space S a.The sound that produces in resonance tube unit 2 and the compartment 105 resonates, reducing the acoustic pressure at proper vibration antinode place, thus the mode suppression in the realization compartment 105.

As shown in figure 16, also embedded resonance tube unit 2 among the front pillar 130a.Be used for arranging that at front pillar 130a the similar of resonance tube unit 2 is in the structure that is used for arranging at center pillar 120a resonance tube unit 2; Therefore, be equipped with the front pillar 130a of resonance tube unit 2 to suppress by implementation pattern, and will omit its detailed description.

Next, describe the structure of the front stall 140 that is equipped with resonance tube unit 2 in detail with reference to Figure 16.

In the headrest 141 of front stall 140 and backrest 142, arranged resonance tube unit 2.Specifically, in the backrest 142 of front stall 140, be arranged vertically two resonance tubes 21, made each openend 23 point to the upper surface of backrest 142.That is, arrange resonance tube unit 2 in the backrest 142 of front stall 140, make the hollow space 25 of resonance tube 21 communicate with compartment 105 by openend 23, wherein, the sound that produces in compartment 105 enters the openend 23 of resonance tube 21 by backrest cover 146.In the headrest 141 of front stall 140, arranged another resonance tube unit 2, wherein in order fully to guarantee total length, folding resonance tube 21 in headrest 141.The openend 23 of the resonance tube 21 that embeds in the headrest 141 of front stall 140 points to the inwall in compartment 105.

Next, the formation of the Qianmen 150A be equipped with public labyrinth cabinet unit 2 is described with reference to Figure 19.In aspect this, in the 150B of Qianmen, do not arrange the resonance tube unit.

As shown in figure 19, in the baseplate material 151 of Qianmen 150A, be arranged vertically resonance tube unit 2, make the openend 23 of resonance tube 21 point to side window 153.The openend 23 of resonance tube 21 is positioned at the upside of the baseplate material 151 of Qianmen 150A, with near the sound attenuation at the antinode place of the acoustic pressures of the appearance raising side window 153.In the upside of the baseplate material 151 of Qianmen 150A, form opening, therefore allow sound easily to enter the openend 23 of resonance tube 21.Preferably the opening of the baseplate material 151 of Qianmen 150A is handled, can not seen easily making it by driver/passenger.

Because the antinode of the acoustic pressure that characteristic frequency (being the natural frequency in the 160Hz frequency band) is located appears near driver/passenger space, therefore adopted second embodiment of the layout of above-mentioned resonance tube unit 2 can realize similar mode suppression with first embodiment.That is, second embodiment among near the antinode of the acoustic pressure that occurs front stall 140 and the side window 153 the acoustic pressure at the antinode place of close driver/passenger space decay.

When resonance tube unit 2 is made of a plurality of resonance tubes 21 that cause coupled oscillations, can reduce acoustic pressure at other frequency place different with natural frequency, therefore further improved the peace and quiet/noise-free environment in the compartment 105.

3, the 3rd embodiment

The third embodiment of the present invention is characterised in that uses helmholtz acoustic resonance device 3, and it is installed in the compartment 105.Be similar to first embodiment aspect the installation site of the 3rd embodiment resonance tube in the general construction of vehicle 100 and compartment 105, wherein identical component parts specified numeral with subscript " b "; Therefore, will omit its detailed description.

Helmholtz acoustic resonance device 3 is as the acoustics sympathetic response device of the 3rd embodiment.Figure 20 A is the skeleton view that the outward appearance of helmholtz acoustic resonance device 3 is shown, and Figure 20 B is the cross-sectional view along the intercepting of the line E-E among Figure 20 A.Helmholtz acoustic resonance device 3 is made of main body 31 and tubular portion 32.At main body 31 and the tubular portion 32 inner hollow spaces that form, hollow space communicates with the opening 33 of tubular portion 32.

At the main body 31 inner cavitys that form, it makes and forms cylindrical by fibre reinforced plastics (FRP).Tubular portion 32 is open tubes of being made by vinyl chloride, and its opposite end is opened.Tubular portion 32 forms as one with main body 31, makes tubular portion 32 insert in the mesopore of main body 31.Helmholtz acoustic resonance device 3 is arranged and is made main body 31 and the tubular portion 32 interior hollow spaces that form communicate with the space in the compartment 105 that is subjected to sound attenuating.When sound entered opening 33, the resonance of the 3 pairs of sound generating of helmholtz acoustic resonance device was to reduce near the acoustic pressure the opening 33.Particularly, helmholtz acoustic resonance device 3 is spring-quality systems, and wherein mass component is corresponding to the air (or body gas) that exist in the tubular portion 32, and the spring composition is corresponding to the cavity of main body 31.Owing to the friction of air on the inwall of tubular portion 32 makes acoustic energy be converted to heat energy, thereby reduced acoustic energy near the particle rapidity having increased opening 33.Resonant frequency f corresponding to the spring-quality system of helmholtz acoustic resonance device 3 satisfies equation (5), and wherein Le represents the effective length of tubular portion 32.Shown in Figure 20 B,, can calculate effective length Le by the cavity length (being in the scope between the opposite end) of measurement tubular portion 32 and by proofreading and correct this cavity length with the openend corrected value.In addition, V represents the volume of the cavity that forms in the main body 31, and Sc represents the area of opening 33.

$f=\frac{{\mathrm{<figure-callout\; id="0"\; label="c"\; filenames="HSA00000262321100171.png"\; state="\{\{state\}\}">c</figure-callout>}}_0}{2\mathrm{\&pi;}}\&CenterDot;{\left(\frac{S}{\mathrm{LeV}}\right)}^{1/2}---\left(5\right)$

In aspect this, needn't be equipped with single tubular portion 32 to helmholtz acoustic resonance device 3; But can on main body 31, unite two tubular portions 32.In addition, can adopt the opening 33 of flow-resistant material (such as glass wool, cloth and gauze) closed tube part 32 with gas penetration potential.

Next, detailed description is used for arrange the structure of helmholtz acoustic resonance device 3 in the compartment 105 of vehicle 100.Similar with first embodiment, helmholtz acoustic resonance device 3 is installed among roof 110b, center pillar 120b, front pillar 130b and front stall 140 and the Qianmen 150A.Because the 3rd embodiment can adopt the installation site identical with first embodiment, so helmholtz acoustic resonance device 3 layouts make hollow space communicate with compartment 105 by opening 33.Helmholtz acoustic resonance device 3 can realize with first embodiment in the similar effect of the plate/film acoustic resonance device that adopts 1.Roof 110b as the installation site example will be described below.

Figure 21 is the cross-sectional view along the roof 110b of the intercepting of the line VIII-VIII among Fig. 2.On the planar section of the roof inner panel 114b of roof 110b, arrange a plurality of plates/film acoustic resonance device 1, and on the angled sides (its area is less than the area of plane surface and just in time be positioned at handrail 200 rears) of roof inner panel 114b, arranged a plurality of helmholtz acoustic resonance device 3.Therefore, can on roof 110b, arrange dissimilar acoustic resonance device effectively.

The 3rd embodiment can realize and the first embodiment similar effects.

4, noise reduction effect

Figure 22 is the curve that illustrates the measurement test result of the noise reduction effect that brings owing to the acoustic resonance device that previous embodiment has been installed in the compartment 105 of vehicle 100.This curve is illustrated in the frequency characteristic of the acoustic pressure of measuring in the operating seat (or noise level), and wherein solid line represents to use the measurement result of acoustic resonance device, and dotted line represents not use the measurement result of acoustic resonance device.Measure test by carrying out with the actual steering vehicle of speed of 60km/h, wherein, therefore accurately detected the frequency characteristic that approaches the actual sense of hearing by using 1/3rd octave band pass filters to come acoustic characteristic (or A characteristic) acoustic pressure is carried out the measurement test.

Figure 22 is clear to be illustrated in the frequency range of 125Hz to 200Hz and to have reduced noise level.Especially, detect noise at 160Hz frequency band place and reduced 5dB or more, show that acoustic pressure reduces greatly in low-frequency range.Compare with the technology of the acoustic pressure of other position that reduces to be different from the proper vibration antinode, previous embodiment that adopt to point to the various acoustic resonance device of acoustic pressure antinode can be improved the peace and quiet/noise-free environment in the compartment 105, therefore shows the noise of brilliance that is subjected to the driver/passenger position place of noise driver/passenger and reduces effect.In addition, the previous embodiment design comes careful selection to help acoustic resonance device " effectively " installation site of noise reduction effect; This has prevented to arrange too much acoustic resonance device in unessential position.

5, modification

The present invention need not be confined to previous embodiment, can also suitably combine or make amendment with following variety of way.

(1) first modification

First embodiment has adopted plate/film acoustic resonance device 1; Second embodiment has adopted resonance tube unit 2; And the 3rd embodiment has adopted helmholtz acoustic resonance device 3.Certainly, plate/film acoustic resonance device 1, resonance tube unit 2 and the helmholtz acoustic resonance device 3 that is installed in selectively in the compartment 105 of vehicle 100 can be combined.The type of acoustics sympathetic response device need not be confined to them, comes the acoustics sympathetic response device that communicates with compartment 105 by opening because the present invention needs to have hollow space simply.Preferably acoustics sympathetic response device can reduce to approach most the acoustic pressure at the antinode place of driver/passenger space by near the arrange openings acoustic pressure antinode.Also preferably the opening of acoustics sympathetic response device is pointed to driver/passenger space.

Each of previous embodiment is designed to make acoustics sympathetic response device is arranged among roof 110, center pillar 120, front pillar 130 front stalls 140 and the Qianmen 150A.Can be among them with acoustics sympathetic response Unit Installation position limit.In the compartment shown in Fig. 5 A 105, only in operating seat 140B, arranged acoustics sympathetic response device, and in copilot seat 140A, do not arranged acoustics sympathetic response device.In addition, can take in the compartment 105 a plurality of installation sites a large-sized acoustics sympathetic response device is installed.

(2) second modification

Previous embodiment design is controlled the acoustic pressure at proper vibration antinode place, because a dimensional pattern of vibration has determined near the antinode (it appears at the side window probably) in the acoustic pressure of propagating on the Width.If the AD HOC with vibration is not a main target, then can reduce the acoustic pressure at the actual any antinode place that occurs in driver/passenger space.This can also present the similar sound attenuation of previous embodiment.Do not consider to depend on the antinode of the acoustic pressure of vibrating different mode, can in the compartment of any kind that is subjected to the low-frequency sound influence, realize significant mode suppression effect.

Can pay close attention in compartment 105 the relevant proper vibration of front and back length on that take place and fore-and-aft direction vehicle 100.Because the length of vehicle 100 is longer than the width of vehicle 100, therefore in the compartment 105 that is subjected to the less important one dimension mode vibration of propagation acoustic pressure on the vehicle fore-and-aft direction, the acoustic pressure antinode of low frequency can appear.Specifically, the antinode of acoustic pressure can appear at the end of the front and back length of vehicle 100, such as the center pillar 120 in the compartment 105 that is subjected to proper vibration, rear pillar 180 and Rear Parcel Shelf 220 (seeing Fig. 2 and Fig. 5 A).Acoustic resonance device can be arranged in the end of the front and back length of vehicle 100, thereby implementation pattern suppresses.Under the situation of less important one dimension mode vibration, around compartment 105 middle positions during the antinode of acoustic pressure can occur on vehicle 100 fore-and-aft directions; Therefore, must arrange that acoustic resonance device suppresses with implementation pattern at front stall 140A, 140B place.

Previous embodiment design arranges that acoustics sympathetic response device is to reduce the acoustic pressure at the acoustic pressure antinode place of close driver/passenger space; But this is also unrestricted.Can on other position, arrange acoustics sympathetic response device.About with the different proper vibration of main pattern of vibration, the antinode of acoustic pressure is arranged very near driver/passenger space, but they need not to be the most close driver/passenger space.The measurement result of Fig. 6 and Fig. 7 shows, do not consider vibration mode (for example a dimensional pattern, two-dimensional model and three dimensional pattern) and vibration order (for example main order (primaryorder), with less important order (secondary order)), present embodiment can reduce the low-frequency sound pressure in compartment 105, and improve at the actual noise reduction effect of hearing the driver/passenger position place of noise of driver/passenger, because acoustics sympathetic response device is arranged the acoustic pressure at the antinode place that is suppressed near the acoustic pressure that occurs driver/passenger space.

(3) the 3rd modification

Can revise the 3rd embodiment, the feasible length that can freely change the tubular portion 32 of helmholtz acoustic resonance device 3.Figure 23 A and Figure 23 B illustrate the modified example of the helmholtz acoustic resonance device 3 of the tubular portion 32a with variable-length.Figure 23 A is the cross-sectional view of tubular portion 32a, and Figure 23 B is the front view with tubulose 32a of opening 323.

Tubular portion 32a is made of outer tube 321 and interior pipe 322.Interior pipe 322 is to have externally threaded tubular part on its outer peripheral face.Interior pipe 322 rotations of tubular portion 32a also are fixed on the main body 31.Outward appearance 321 is tubular parts, and its internal diameter also has internal thread on the surface within it greater than the diameter of interior pipe 322.Pipe 322 was screwed in the outer tube 321 by screw thread in tubular portion 32a assembled and makes.Pipe 322 was screwed into the length in the outer tube 321 in the length L of tubular portion 32a depended on.The contour shape of outer tube 321 is hexagons shown in Figure 23 B; Therefore, the user can regulate the length that is screwed into as the machine tool of spanner and so on by using, and has therefore freely changed the length L of tubular portion 32a.Because the resonant frequency of helmholtz acoustic resonance device 3 depends on the length L of tubular portion 32a, therefore can regulate resonant frequency in case of necessity.

Figure 23 A and Figure 23 B illustrate tubular portion 32a and adopted helicitic texture in outer tube 321 and interior pipes 322, therefore can freely regulate length L; But this is also unrestricted.Tubular portion 32a can be made up of three or more screwed parts.Replacedly, can provide the tubular portion 32a of the pipe of band cornice as helmholtz acoustic resonance device 3.That is, tubular portion 32a can adopt the various structures of the dirigibility that has expansion and shrink.The contour shape of outer tube 321 needn't form sexangle; But preferably the shape of tubular portion 32a allows the user can easily regulate its length.

The 3rd modification allows the user easily to select to suppress greatly the frequency of acoustic pressure, even the frequency of selecting in order to improve peace and quiet/noise-free environment is according to the difference of the different and type of vehicle of material that is applicable to compartment 105 and structure and difference.

(4) the 4th modification

Can adopt grill member 4 to substitute resonance tube unit 2.Figure 24 A and Figure 24 B illustrate the grill member 4 that is used as according to the acoustics sympathetic response device of the 4th embodiment.Figure 24 A is the decomposition diagram of grill member 4, and Figure 24 B is the side view of the grill member 4 of looking from the direction F shown in Figure 24 A.

Shown in Figure 24 A, grill member 4 is made of single dividing plate 4A (it elongates on single direction) and six dividing plate 4B (it intersects with dividing plate 4A and elongates perpendicular to dividing plate 4A) that intersect with it.Grill member 4 is attached to the upper surface of roof inner panel 114, makes dividing plate 4A be positioned on the fore-and-aft direction of vehicle 100, and the dividing plate 4B that intersects is positioned on the Width perpendicular to the fore-and-aft direction of vehicle 100.Therefore, the lower end of grill member 4 is by roof inner panel 114 sealing, and the upper end of grill member 4 is used as the part (such as the roof outer panel 160 that combines with roof inner panel 114) on chassis of the skeleton of vehicle and covers.

Grill member 4 has ten hollow spaces, and they are limited between the adjacent separator 4B of intersection and have the opening that points to Width, therefore realized 26S Proteasome Structure and Function all with resonance tube unit 2 similar acoustics sympathetic response device roughly.In aspect this, the top and bottom of grill member 4 all can be sealed, also can only seal the upper end of grill member 4 or closed lower only.Grill member 4 has substituted the resonance tube unit 2 of the ceiling (being roof 110) that is attached to vehicle 100.Can change the quantity of the dividing plate 4B that intersects according to the quantity of the hollow space of expecting arbitrarily.

(5) the 5th modification

Figure 26 shows by the accordion plate of making such as the flexible material of resin and so on 5, and it has a plurality of recesses that in fact are used as a plurality of acoustic resonance device.Accordion plate 5 can be attached to the ceiling portion or the inwall in compartment 105, makes a plurality of acoustic resonance device absorb the ceiling portion in compartment 105 or the sound at inwall place.Have flexible accordion plate 5 can be easily according to the surface deformation of curved surface; Therefore can easily 105 desired locations place realizes a plurality of acoustic resonance device in the compartment.

(6) the 6th modification

The plate of first embodiment/film acoustic resonance device 1 is made of the Vib. 15 of the opening 12 of rectangular parallelepiped shell 10, closure 10 and the cavity 13 that is formed on shell 10 inside.The contour shape of shell need not be confined to rectangular shape, can replace with cylindrical or polyhedron-shaped.Irrelevant with the contour shape of shell 10, the lumped mass (concentrated mass) that changes the condition of vibration acoustic resonance device 15 preferably is positioned at the core of Vib. 15.

Plate/film acoustic resonance device 1 has the sound absorption mechanism that is made of spring-quality system and bending system.We come the acoustical absorption coefficient at resonant frequency place is tested by the superficial density that changes Vib. 15.

Specifically, we have prepared the sample of shell 10, and its middle chamber 13 has the length of 100mm, the width of 100mm and the thickness of 10mm; The sample that has also prepared Vib. 15, it has the length of 100mm, the width of 100mm and the thickness of 0.85mm, and wherein the core of Vib. 15 (having the length of 20mm, the width of 20mm and the thickness of 0.85mm) changes aspect superficial density.Figure 25 is the curve that the plate/analog result of film acoustic resonance device 1 aspect normal incidence absorption coefficient is shown.We have adopted, and (title is " determining-part 2 of acoustical absorption coefficient in acoustics-impedance tube and impedance " according to Japanese Industrial Standards JIS A1405-2, Acoustics-Determination of sound absorption coefficient andimpedance in impedance tubes-Part 2) analogy method, wherein plate/film acoustic resonance device 1 is arranged in the sound chamber so that determine its sound field by finite element method, afterwards, use transport function to calculate sound absorption characteristics.Specifically, the curve of Figure 25 shows five family curves (1) to (5), and they are based on (in the central part office of Vib.) different surfaces density, such as (1) 399.5[g/m ²], (2) 799[g/m ²], (3) 1199[g/m ²], (4) 1598[g/m ²] and (5) 2297[g/m ²]; Similar face 799[g/m in the periphery office of Vib. 15 ²] density; And the different average densities of Vib. 15, such as (1) 783[g/m ²], (2) 799[g/m ²], (3) 815[g/m ²], (4) 831[g/m ²] and (5) 863[g/m ²].This analog result is clearly shown that, the peak value of acoustical absorption coefficient mainly appears in the frequency from 300Hz to 500Hz and near the 700Hz frequency.

Because become the sympathetic response of the spring-quality system that branch forms by the spring of the mass component of Vib. 15 and cavity 13, acoustical absorption coefficient is local maximum near the 700Hz frequency.Plate/film acoustic resonance device 1 is sentenced the peak value acoustical absorption coefficient at the resonant frequency of spring-quality system and is absorbed sound, even wherein the superficial density of the core of Vib. 15 increases, the gross mass of Vib. 15 can significantly not change yet; This shows, no matter the superficial density of the core of Vib. 15 how, the resonant frequency of spring-quality system can not change greatly.The resonance of the bending system that causes owing to being vibrated by the bending of Vib. 15 maximizes in the frequency range of acoustical absorption coefficient between from 300Hz to 500Hz.Plate/film acoustic resonance device 1 causes the peak value acoustical absorption coefficient at the lower frequency side of the resonant frequency of bending system, and its superficial density along with the core of Vib. 15 increases and becomes lower.Put it briefly, the resonant frequency of bending system determines that by the formula of the motion of the elastic oscillation of leading Vib. 15 wherein the density (or superficial density) of this resonant frequency and Vib. 15 is inversely proportional to.The resonant frequency of bending system is subjected to the density influence of the antinode (becoming maximum in this place's amplitude) of proper vibration greatly.That is, the resonant frequency of bending system changes, because top simulation has changed the antinode zone of 1 * 1 characteristic model with different Vib.s 15 core superficial densities.

Above-mentioned analog result shows, along with the superficial density of the core of Vib. 15 increases to superficial density greater than the peripheral part of Vib. 15, in a plurality of peak value acoustical absorption coefficienies, the peak value acoustical absorption coefficient of lower frequency side moves to more low frequency.This shows that the peak value acoustical absorption coefficient can move to more low frequency or higher frequency by the superficial density of the core that changes Vib. 15.Thereby with Vib. 15 is formed by comparing by the technology that the gross mass that increases plate/film acoustic resonance device 1 changes the sound absorption frequency with writing board shape that plate/film acoustic resonance device 1 identical materials constitutes, present technique can not change the gross mass of plate/film acoustic resonance device 1 and freely reduce the sound absorption frequency, because the superficial density of core that can be by changing the Vib. 15 in plate/film acoustic resonance device 1 simply changes the sound absorption frequency corresponding with the peak value acoustical absorption coefficient.

Cavity 13 by with sound-absorbing porous material (for example foamed resin, felt materials and such as the cotton fiber of polyester woolen cloth and so on) infill panel/film acoustic resonance device 1 can change resonance characteristics.This modification can be tackled owing to vibration mode changes (for example change of the quantity of personnel and luggage and shape) and noise changes the variation of the compartment 105 interior noisinesss that (for example tire changes and road conditions change) cause.

(7) the 7th modification

First embodiment has adopted identical shaped to all plates/film acoustic resonance device 1; But can take different shapes plate/film acoustic resonance device 1.Therefore, can widen the frequency range that has reduced acoustic pressure, this be because the resonant frequency of plate/film acoustic resonance device 1 according to the difference of the size of shell 10 and difference.Can different resonant frequencies be set to front stall 140A and 140B.In addition, can with center pillar 120 different resonant frequencies be set to roof 110.The acoustic pressure that this has reduced in the wide frequency ranges wherein can reduce to be suitable for the acoustic pressure at the optimum frequency place of each position.That is, various group each all adopt single acoustic resonance device or a plurality of acoustic resonance device to form, and wherein every group of acoustic resonance device has different resonant frequencies.Similarly, can adopt the various types of resonance tubes unit 2 with different resonant frequencies and various types of helmholtz acoustic resonance device 3 with different resonant frequencies.

Second embodiment has adopted the pipe of sealing as the resonance tube 21 with an openend 23 and a blind end 22.Can adopt open tube that two opposite ends all open as resonance tube 21.As an alternative, can in resonance tube unit 2, mix use sealed tube and open tube.

(8) the 8th modification

Previous embodiment has been used acoustics sympathetic response device to the vehicle 100 of car and so on; But can also be to the vehicle applied acoustics sympathetic response device of other type, such as train, steamer, aircraft, space station and pontoon barge.Term " vehicle " comprises delivery people/or the conveying arrangement of article.In addition, this term also comprises carrier and the facility that the non-communications and transportation used in the amusement park is used, such as Ferris Wheel.The application of acoustics sympathetic response device need not be confined to the residing compartment of people in the vehicle; Therefore, acoustics sympathetic response device can be applied to machine room and the baggage room that the compartment with vehicle separates.Personnel enter machine room or baggage room probably.Some vehicles are not equipped with the seat in the driver/passenger space in compartment.Many passengers do not use the seat in open-top car, bus and the train.Comprise in the vehicle of passenger space at those, can realize being suitable for the mode suppression of passenger space, therefore realized and the previous embodiment similar effects at acoustic pressure antinode place.

The vehicle of car type has been equipped with can install acoustics sympathetic response Unit Installation structure, and such as roof, center pillar, front pillar, front stall and Qianmen, and the vehicle of other type differs to establish a capital and is equipped with such mounting structure.But, acoustics sympathetic response device can be attached in other vehicle the suitable counter structure of mounting structure with car type vehicle.Will not be attached on the mounting structure that is combined in vehicle and the compartment 105 by acoustics sympathetic response device.Before mounting structure and vehicle 100 and compartment 105 are combined into one, can earlier acoustics sympathetic response device be installed in vehicle 100 and the compartment 105.

The present invention does not limit acoustics sympathetic response Unit Installation position, and the installation site is not necessarily limited to the wall on every side in compartment 105 and the seat of driver/passenger space.Acoustics sympathetic response device can be attached to any position of the acoustic pressure at the antinode place that helps reducing proper vibration.

(9) the 9th modification

The 3rd embodiment can be revised the tubular portion 32a that regulates helmholtz acoustic resonance device 3 automatically.This need comprise the self-checking device of microphone, frequency analyzer, controller and driver.In this self-checking device, microphone receives sound, and then the sound that received of frequency analyzer analysis is to point out to have increased greatly the frequency of noise.Controller is according to the length of pointed frequency computation part helmholtz acoustic resonance device 3 tubular portion 32a; Then, the drive signal of the length calculated to driver (as solenoid) output expression of controller.Actuator response is regulated the length of the tubular portion 32a of helmholtz acoustic resonance device 3 in this drive signal, thereby has reduced especially the acoustic pressure at the pointed frequency place that increases noise greatly.In aspect this, can use FEEDBACK CONTROL to the controller that drives tubular portion 32a.

Can use expansion/contraction mechanism to helmholtz acoustic resonance device 3, thereby change the size of main body 31.This cavity volume that has changed main body 31 is to change the resonant frequency of helmholtz acoustic resonance device 3.Similarly, can use expansion/contraction mechanism to regulate the length of resonance tube 21 to resonance tube unit 2.

(10) the tenth modification

Previous embodiment is arranged in the selected location place corresponding with the acoustic pressure antinode at the specific natural frequency place of proper vibration with acoustics sympathetic response device, and wherein resonant frequency is provided to increase the value that reduces in the acoustic pressure at natural frequency antinode place.The resonant frequency of decay acoustic pressure can be arranged on other frequency place different with natural frequency.

During the transport condition of vehicle 100, tire makes vehicle 100 be subjected to the vibration of characteristic frequency (hereinafter referred to as excitation frequency) as driving source (causing the vibration in the compartment 105), thereby causes the noise in the compartment 105.Even compartment 105 has the natural frequency of 167Hz, in compartment 105, it is maximum that acoustic pressure reaches at the frequency place of 155Hz; Therefore, these frequencies belong to the same frequency range that is subjected to mode suppression, but they are slightly different each other.Here, the frequency range that is subjected to mode suppression equals for example 160Hz frequency band.Previous embodiment is selected the position of acoustics sympathetic response device according to proper vibration, and wherein they can determine resonant frequency according to the caused sound of driving source.Promptly, when specific natural frequency since external condition (for example friction force of tire running on the road surface) and with the excitation frequency that is applied to compartment 105 not simultaneously, can determine that resonant frequency is implemented in the sound attenuation at the high-frequency place that the excitation owing to the excitation frequency place increases.In practice, acoustics sympathetic response device is arranged near the acoustic pressure antinode in the 160Hz frequency band, so acoustics sympathetic response device produces resonance to the frequency of 155Hz according to proper vibration.Because excitation frequency and natural frequency may belong to same frequency range, therefore need regulate the acoustic pressure that acoustics sympathetic response device reduces those frequency places at the resonant frequency place; Therefore, will not be confined to the 160Hz frequency band by resonant frequency.

In the tenth modification, adopt each resonant frequency is set to mode by the caused crest frequency of excitation at the excitation frequency place under compartment 100 transport conditions, can realize the automatic control of the 9th embodiment.Put it briefly, the vehicle of car type can meet with the situation that excitation frequency changes when travels down, make the excitation frequency characteristic change often, and each sound field has unique natural frequency characteristic; Therefore, the natural frequency characteristic can always not appear in the compartment.Therefore, the microcontroller of microcomputer and so on comes automatic guide sound to learn the sympathetic response device with the adjusting resonant frequency in response to excitation frequency, thereby has effectively reduced the noise in the compartment.Here, microcomputer can such as travel speed, engine speed, accelerator open degree and automobile gear position, calculate excitation frequency according to various parameters.

(11) the 11 modification

The resonant frequency of acoustics sympathetic response device does not need to be fixed on natural frequency; But by the interactional mode that causes owing to the coupled oscillations between the inner space of the space of having arranged acoustics sympathetic response device and acoustics sympathetic response crust of the device, acoustics sympathetic response device has reduced the acoustic pressure at natural frequency place.Broadly explain, can regard the structure of having arranged acoustics sympathetic response device as be connected to acoustics sympathetic response device less important acoustic resonance device.Because the coupled oscillations of the interrelated formation between acoustics sympathetic response device and the less important acoustic resonance device, add between the less important acoustic resonance device at compartment and acoustics sympathetic response device to have exchanged acoustic energy, thereby be implemented in the extra sound attenuation in another frequency range.

(12) the 12 modification

Resonance tube unit 2 has consumed acoustic energy by viscosity resistance between inwall and the air molecule and friction.In the position of the high particle rapidity that stands sound wave, the consumption of acoustic energy increases.For this reason, when being arranged in the position of standing high particle rapidity, resonance tube unit 2 can effectively reduce acoustic pressure.Can test the position of specifying high particle rapidity by the measurement that the particle rapidity except the acoustic pressure antinode is measured.

(13) the 13 modification

Previous embodiment arranges that acoustics sympathetic response device reduces the acoustic pressure at the antinode place of proper vibration; But, can arrange that acoustics sympathetic response device only is used to increase the movement velocity (being particle rapidity) such as the medium of particle and so on.Speed when specifically, the movement velocity of particle is particle vibration.

The antinode place of the acoustic pressure in the compartment 105 that stands proper vibration, acoustic pressure maximum and particle rapidity minimum.The particle rapidity that increases acoustic pressure antinode place can change proper vibration, has therefore improved the peace and quiet/noise-free environment in the compartment 105.This causes the resonance at the medium of acoustic pressure antinode place (wherein acoustic pressure is owing to proper vibration increases); Therefore, can realize and the previous embodiment similar effects.

Resonance tube can satisfy the requirement according to the above-mentioned acoustics sympathetic response device of the 13 modification.Even in the hollow space of the resonance tube that meets critical conditions (being zero wherein), have standing wave, also locate maximization at main resonant frequency (that is minimum resonant frequencies) in the particle rapidity of resonance tube opening part in resonance tube opening part particle rapidity.That is, can increase particle rapidity at the resonance tube opening part of the antinode that equals or approach the acoustic pressure that proper vibration causes.When using resonance tube to increase particle rapidity, preferably do not use Fluistor.Because do not use the resonance tube of Fluistor to cause high particle rapidity by resonance.Except resonance tube (or resonance tube unit 2), can also adopt plate/film acoustic resonance device 1 or helmholtz acoustic resonance device 3, wherein can increase particle rapidity at the Vib. 15 of plate/film acoustic resonance device 1 or opening 33 places of helmholtz acoustic resonance device 3.

The said structure that increases particle rapidity only is an example; Therefore, can adopt the acoustic resonance device that can increase any kind of particle rapidity by resonance.In brief, thus the 13 Variant Design determine the layout of acoustic resonance device and increase the particle rapidity at the antinode place of the acoustic pressure that causes by proper vibration.

(14) the 14 modification

Peace and quiet/noise-free environment except passenger space on the back seat 190 that improves the peace and quiet/noise-free environment around the front stall 140, can also improve the antinode influence that suffers the acoustic pressure that causes by proper vibration.In this case, layout acoustics sympathetic response device is controlled the acoustic pressure at proper vibration antinode place, and this proper vibration antinode appears near the back ceiling portion that just in time is positioned at back seat 190, back door 150B and rear pillar 180 tops.The present invention need not be confined to improve the layout of acoustics sympathetic response device of the peace and quiet/noise-free environment of driver/passenger space on the front stall 140; Therefore, can control the acoustic pressure at proper vibration antinode place according to any space in compartment 105.

The wall that has embedded acoustics sympathetic response device need not be confined to the dividing plate between compartment 105 and vehicle 100 outsides; Therefore, acoustics sympathetic response device can be installed in other wall that is communicated with compartment 105, such as door and support component.

The previous embodiment emphasis is at the antinode based on the acoustic pressure in the 160Hz frequency band of proper vibration; But, also can be at other natural frequency.

The position of opening is depended in the zone that (by the resonance of acoustics sympathetic response device) has reduced the zone of acoustic pressure and increased particle rapidity.These zones needn't be arranged in compartment 105, but can be positioned at any position of vehicle 100.

As mentioned above, the present invention need not be confined to previous embodiment and modification, can further revise the present invention in every way within the scope of the invention that claims limit.

Claims (21)

1. acoustics sympathetic response device, it comprises at least one acoustic resonance device with inner space and opening, the inner space of wherein said acoustic resonance device communicates with the compartment of vehicle by described opening, and wherein said acoustic resonance device reduced with driver/passenger space at the interior of vehicle in the acoustic pressure at the corresponding specific natural frequency of antinode place of the proper vibration that occurred.

2. according to the acoustics sympathetic response device of claim 1, wherein said acoustic resonance device is arranged among a plurality of antinodes of the proper vibration that reduces and occur its position acoustic pressure at the corresponding specific natural frequency of the antinode place of the proper vibration of close driver/passenger space in the compartment of vehicle.

3. acoustics sympathetic response device, it comprises at least one acoustic resonance device with inner space and opening, the inner space of wherein said acoustic resonance device communicates with the compartment of vehicle by described opening, and wherein said acoustic resonance device increased with driver/passenger space at the interior of vehicle in the particle rapidity at the corresponding specific natural frequency of antinode place of the proper vibration that occurred.

4. according to the acoustics sympathetic response device of claim 1, wherein said acoustic resonance device has reduced the acoustic pressure at excitation frequency place by the mode of sympathetic response, and described excitation frequency produces owing to the external condition of vehicle and be different with specific natural frequency.

5. according to the acoustics sympathetic response device of claim 3, wherein said acoustic resonance device has reduced the acoustic pressure at excitation frequency place, and described excitation frequency produces owing to the external condition of vehicle and be different with specific natural frequency.

6. according to the acoustics sympathetic response device of claim 4, wherein said proper vibration is a main vibration mode of propagating acoustic pressure on the Width of vehicle.

7. according to the acoustics sympathetic response device of claim 5, wherein said proper vibration is a main vibration mode of propagating acoustic pressure on the Width of vehicle.

8. according to the acoustics sympathetic response device of claim 4, wherein said proper vibration is a less important vibration mode of propagating acoustic pressure on the fore-and-aft direction of vehicle.

9. according to the acoustics sympathetic response device of claim 5, wherein said proper vibration is a less important vibration mode of propagating acoustic pressure on the fore-and-aft direction of vehicle.

10. according to the acoustics sympathetic response device of claim 4, wherein at least one seat is modified to install acoustic resonance device in the seat in driver/passenger space.

11. according to the acoustics sympathetic response device of claim 5, wherein at least one seat is modified to install acoustic resonance device in the seat in driver/passenger space.

12. according to the acoustics sympathetic response device of claim 4, wherein said acoustic resonance device is installed in the roof of vehicle.

13. according to the acoustics sympathetic response device of claim 5, wherein said acoustic resonance device is installed in the roof of vehicle.

14. according to the acoustics sympathetic response device of claim 4, wherein said acoustic resonance device is installed in the post of support roof of vehicle.

15. according to the acoustics sympathetic response device of claim 5, wherein said acoustic resonance device is installed in the post of support roof of vehicle.

16. according to the acoustics sympathetic response device of claim 4, wherein said acoustic resonance device is installed in the door of vehicle.

17. according to the acoustics sympathetic response device of claim 5, wherein said acoustic resonance device is installed in the door of vehicle.

18. according to the acoustics sympathetic response device of claim 1, the opening of wherein said acoustic resonance device points to the outside of vehicle.

19. according to the acoustics sympathetic response device of claim 3, the opening of wherein said acoustic resonance device points to the outside of vehicle.

20. acoustics sympathetic response device according to claim 1, wherein said acoustic resonance device is attached to the roof of vehicle, and relatively arrange to communicate with the extraneous air of vehicle with the inner space in compartment, and near the opening of the wherein said acoustic resonance device sensing hole, described hole is passed the roof of vehicle and is communicated with the inner space in compartment.

21. acoustics sympathetic response device according to claim 3, wherein said acoustic resonance device is attached to the roof of vehicle, and relatively arrange to communicate with the extraneous air of vehicle with the inner space in compartment, and near the opening of the wherein said acoustic resonance device sensing hole, described hole is passed the roof of vehicle and is communicated with the inner space in compartment.

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