CN110406554B - Dust cover noise reduction structure and noise reduction method of rail train - Google Patents
Dust cover noise reduction structure and noise reduction method of rail train Download PDFInfo
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- CN110406554B CN110406554B CN201810401224.1A CN201810401224A CN110406554B CN 110406554 B CN110406554 B CN 110406554B CN 201810401224 A CN201810401224 A CN 201810401224A CN 110406554 B CN110406554 B CN 110406554B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D17/00—Construction details of vehicle bodies
- B61D17/04—Construction details of vehicle bodies with bodies of metal; with composite, e.g. metal and wood body structures
- B61D17/18—Internal lining, e.g. insulating
- B61D17/185—Internal lining, e.g. insulating for sound insulating
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Abstract
The invention relates to a dust cover noise reduction structure and a noise reduction method of a rail train. The dust cover noise reduction structure comprises a dust cover, a plurality of quarter wave pipes and an acoustic packaging material, wherein the quarter wave pipes are arranged on the outer surface of the dust cover, one end of each quarter wave pipe is communicated with the inside of the dust cover, the other end of each quarter wave pipe is sealed, and the acoustic packaging material covers the area, on the outer surface of the dust cover, where the quarter wave pipes are not arranged. According to the invention, the acoustic package and the quarter-wave tube are combined, so that the noise sound pressure level in the railway train is effectively reduced, the sound quality in the train is effectively improved, and the problem that the motor cannot be wrapped to perform acoustic package treatment is solved.
Description
Technical Field
The invention relates to the field of rail trains, in particular to a dust cover noise reduction structure and a noise reduction method of a rail train.
Background
In the running process of a rail train, two noises are obvious in the environment inside the train, one is the squeaking noise of a motor, and particularly in the energy feedback stage in the braking process, the frequency is high, and the sound is sharp; the other is tire noise generated by friction between the tire and the track beam, the frequency is relatively low, and the rough feeling is strong.
The existing noise reduction schemes mainly have two types: one is passive noise reduction, also called physical noise reduction, which comprises structure optimization, resonance elimination, sound absorption and insulation by damping materials and the like; the other is active noise reduction, which generates an acoustic signal with a phase opposite to that of the noise signal to perform phase cancellation on low-frequency motor noise.
The traditional sound absorption and insulation physical noise reduction technology is a general technology at present, but the physical noise reduction is limited by the heat dissipation index of a motor, and can only be adopted in a limited way, and the high-frequency noise of the motor still cannot meet the ideal requirement. Moreover, the system structure between the driving motor and the tire of the rail train is complex, and acoustic packaging is not easy to perform. On the other hand, because the frequency of the motor noise is very high and the wavelength is very short, it is difficult to capture the phase of the motor noise to generate the inverse sound wave to actively cancel, and even if the phase can be captured, the search step length is continuously adjusted, so the number of cycles is very large, the calculation amount is very large, the algorithm is difficult to implement, even if the algorithm can be implemented, the requirement on hardware is very high, and the cost is high.
Disclosure of Invention
The invention aims to provide a dust cover noise reduction structure of a rail train, which can effectively reduce the noise sound pressure level transmitted from the position of the dust cover to the inside of the train.
In order to achieve the above object, the present invention provides a dust cover noise reduction structure of a rail train, the dust cover noise reduction structure including a dust cover, a plurality of quarter wave tubes arranged on an outer surface of the dust cover, one end of each quarter wave tube communicating with an inside of the dust cover and the other end being closed, and an acoustic packing material covering an area on the outer surface of the dust cover where the quarter wave tubes are not arranged.
Optionally, the plurality of quarter wave tubes comprises quarter wave tubes of various lengths.
Optionally, a plurality of mounting holes are formed in the dust cover, and each quarter-wave tube is inserted into a corresponding mounting hole.
Optionally, the quarter wave tube is vertically mounted on the dust cover.
Optionally, one end of the quarter wave tube inserted into the dust cover is flush with the inner surface of the dust cover.
Optionally, the quarter wave tubes extend into the interior of the dust cap, the extension length of each quarter wave tube being equal.
Optionally, the gaps between the outer surfaces of the quarter wave tubes are filled with a sealing foam rubber.
Optionally, the acoustic packaging material includes a damping vibration reduction layer, a first heavy sound insulation layer, a damping sound absorption layer, a coupling sound insulation layer, and a second heavy sound insulation layer, which are sequentially arranged from inside to outside, the damping vibration reduction layer is made of a wide temperature range damping material, the first heavy sound insulation layer and the second heavy sound insulation layer are made of a heavy rubber sound insulation material, the damping sound absorption layer is made of a porous rubber material, and the coupling sound insulation layer is made of a closed-cell foam material.
Optionally, the porous rubber material is a three-dimensional porous material formed by bonding rubber particles by an adhesive; the closed-cell foam material is at least one selected from polyethylene, ethylene propylene diene monomer, silicone rubber and nitrile rubber; the heavy rubber sound insulation material is an ethylene propylene diene monomer rubber-based sound insulation material and/or an ethylene-vinyl acetate copolymer-based sound insulation material; the wide temperature range damping material is at least one selected from butyl benzene rubber, acrylate, nitrile rubber and asphalt damping material.
Optionally, the length of the quarter-wave tube is defined as L, the target muffling frequency is defined as f, and a formula is satisfied
Where c is the speed of sound in air and n is a natural number.
According to the invention, the acoustic package and the quarter-wave tube are combined, so that the noise sound pressure level in the railway train is effectively reduced, the sound quality in the train is effectively improved, and the problem that the motor cannot be wrapped to perform acoustic package treatment is solved.
The invention also provides a noise reduction method of the rail train, which comprises the following steps:
collecting and analyzing the noise transmitted from the dust cover to the interior of the vehicle, and determining a target noise elimination frequency f;
according to the formula
Determining the length of the quarter wave tube, wherein L is the length of the quarter wave tube and c is the speed of sound in airN is a natural number;
manufacturing a quarter-wave tube according to the determined length;
mounting the manufactured quarter-wave tube on a dustproof cover;
acoustically packaging a region of the outer surface of the dust cap where the quarter wave tube is not disposed.
Optionally, the noise reduction method further comprises: and injecting sealing foam rubber into the gap between the outer surfaces of the quarter-wave tubes.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
1-3 are perspective views from three different perspectives of a dust cap noise reduction structure according to one embodiment of the present invention;
FIG. 4 is a cross-sectional view of a dust cap noise reduction feature according to an embodiment of the present invention;
FIG. 5 is a graph of the noise spectrum of one surface of the dust cover.
Description of the reference numerals
1 dust cover 2 quarter wave tube
3 damping layer of acoustic packaging material 31
32 first heavy sound-insulating layer 33 damping sound-absorbing layer
34 coupled sound insulation layer 35 second sound insulation layer
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The definition and determination method of part of parameters in the invention are as follows:
sound absorption coefficient: section 1 of the measurement of sound absorption coefficient and sound impedance in GB/T18696.1-2004 acoustic impedance tubes: standing wave ratio method ".
Average Noise Reduction Coefficient (English name: Noise Reduction Coefficient, abbreviated as NRC): the calculation method comprises the following steps: average values of sound absorption measured at 250, 500, 1000, 2000 Hz.
Weighting sound insulation amount (or called average sound insulation amount): part 1 is measured using the "acoustical building and building component sound insulation intensity method: laboratory measurements "were performed.
Closed pore rate: the determination is carried out by using GB/T10799 and 2008 determination of open-cell and closed-cell volume percentage of the rigid foam.
Damping coefficient (may also be referred to as damping loss factor): determination of dynamic Properties of vulcanizates or thermoplastic rubbers Using "GB/T9870.1-2006 part 1: general rules "determine.
Areal density specifies the mass per unit area of material for a thickness of 1.2 mm.
European Union N45545-2R1 hazard class HL1 data requirements (European Union EN 45545 locomotive fire protection-part 2: fire protection requirements for materials and elements): the CFE flame extension test is more than or equal to 20; the heat release amount is not required; the smoke density of Ds (4) is less than or equal to 600; the smoke density of the VOF (4) is less than or equal to 1200; the toxicity test is less than or equal to 1.2.
In the present invention, the terms "inside" and "outside" used herein refer to the inside and outside of the outline of the dust cover itself, unless otherwise specified.
As shown in fig. 1 to 3, according to one aspect of the present invention, there is provided a dust cap noise reduction structure of a railway train, the dust cap noise reduction structure comprising a dust cap 1, a plurality of quarter wave tubes 2, and an acoustic packing material 3, the plurality of quarter wave tubes 2 being arranged on an outer surface of the dust cap 1, one end of each quarter wave tube 2 communicating with an interior of the dust cap 1 and the other end being closed, the closed ends (tops) of the quarter wave tubes 2 being located outside the dust cap 1, the acoustic packing material 3 covering an area on the outer surface of the dust cap 1 where the quarter wave tubes 2 are not arranged.
The dust cover 1 covers a power system of the rail train and is used for separating the power system from the interior of the train, so that dust, sundries and the like are prevented from entering the train. The inventors of the present invention found through studies that the dust cover 1 is a main propagation path of noise transmitted from the outside of the vehicle to the inside of the vehicle. Based on the above findings, the present invention arranges the acoustic packing material 3 on the outer surface of the dust cover 1 in the region where the quarter-wave tube 2 is not arranged by attaching the quarter-wave tube 2 to the dust cover 1.
In the prior art, an effective noise reduction method aiming at high-frequency noise of a motor is not available, and the frequency band noise cannot be fundamentally processed at present. The invention creatively combines the acoustic package with the quarter-wave tube, effectively reduces the noise sound pressure level in the railway train, effectively improves the sound quality and solves the problem that the motor can not be wrapped for acoustic package treatment.
The working principle of the quarter-wave tube is explained in detail below.
A quarter wave tube is a typical passive muffler, which is a closed tube mounted on a main pipe. When the sound wave enters the quarter-wave tube from the main tube, the sound wave is reflected by the closed end to return to the main tube, and the sound wave with certain frequency and the same sound wave in the main tube are mutually offset due to opposite phases, so that the aim of silencing is fulfilled. If the transmission loss is used to evaluate the muffling effect of the quarter-wave tube, it is expressed by the following equation:
in the above formula, L is the length of 1/4 wave tubes, m is the ratio of the sectional area of the quarter wave tube to the sectional area of the main tube, and λ is the wavelength of the sound wave. In the above formula
(n is a natural number), the transmission loss is the largest. At this time
When n is equal to 1, the compound is,
the resonance frequency of the quarter-wave tube is:
where C is the speed of sound in air.
In the running process of a rail train, two noises are obvious in the environment inside the train, one is the squeaking noise of a motor, and particularly in the energy feedback stage in the braking process, the frequency is high, and the sound is sharp; the other is tire noise generated by friction between the tire and the track beam, the frequency is relatively low, and the rough feeling is strong. The application of the quarter wave tube can reduce the sound pressure level of high-frequency components of noise on one hand, and can excite certain low-frequency sound components on the other hand, so that the low-frequency proportion is increased, the high-frequency proportion is reduced, and the sharpness is reduced.
In the noise reduction structure of the dust cover of the present invention, in order to eliminate noises of various frequencies, as shown in fig. 1 to 3, the quarter-wave tube 2 mounted on the dust cover 1 includes quarter-wave tubes 2 of various lengths, and each quarter-wave tube 2 of various lengths is used to eliminate noises of corresponding frequencies, thereby more effectively reducing the total sound pressure level of the noises transmitted to the vehicle interior.
In order to facilitate the installation of the quarter-wave tube 2 on the dust cover 1, in one embodiment, as shown in fig. 1 to 3, a plurality of installation holes are opened on the dust cover 1, and one end of each quarter-wave tube 2 is inserted into the corresponding installation hole. In other alternative embodiments, the quarter wave tube 2 may be integrally formed with the dust cap 1.
In order to increase the effective length of the quarter wave tube 2 as much as possible and save the material cost of the quarter wave tube 2, in one embodiment, as shown in fig. 3, one end of the quarter wave tube 2 inserted into the dust cap 1 is flush with the inner surface of the dust cap 1, that is, the bottom of the quarter wave tube 2 is in the same plane with the inner surface of the dust cap 1. In an alternative embodiment, the quarter wave tubes 2 may extend into the interior of the dust cap 1, the protruding length of each quarter wave tube 2 being uniform.
In the dust cover noise reduction structure of the present invention, preferably, as shown in fig. 1 to 3, the quarter wave tubes 2 are assembled perpendicularly to the dust cover 1, that is, each quarter wave tube 2 is perpendicular to the surface of the dust cover 1 on which it is placed. With quarter wave pipe 2 perpendicular assembly on dust cover 1, can avoid the sound face of advancing of wave pipe 2 and the axis of wave pipe 2 to be the acute angle on the one hand, avoid producing the noise of whistling, on the other hand can guarantee by the blind end of wave pipe 2 reflect back dust cover 1 the sound wave just in time opposite with the sound wave of same frequency in the dust cover 1, promote noise reduction effect.
Further, in one embodiment, the gaps between the outer surfaces of the quarter wave tube 2 are filled with a sealing foam (not shown). The main component of the sealing foam adhesive is polyurethane, which has two main functions, namely fixing the quarter-wave tube 2 and eliminating the gap between the outer surfaces of the quarter-wave tube 2 to prevent a new sound cavity from being formed.
In the dust cover noise reduction structure of the present invention, in order to further enhance the noise reduction effect, the region on the outer surface of the dust cover 1 where the quarter wave tube 2 is not arranged is covered with the acoustic packing material 3.
Here, the acoustic packaging layer may have any suitable structure and composition. In one embodiment, as shown in fig. 4, the acoustic packaging material 3 includes a damping vibration-damping layer 31, a first heavy sound-insulating layer 32, a damping sound-absorbing layer 33, a coupling sound-insulating layer 34, and a second heavy sound-insulating layer 35, which are arranged in this order from the inside to the outside. The damping vibration attenuation layer 31 is made of a wide-temperature-range damping material, the first heavy sound insulation layer 32 and the second heavy sound insulation layer 35 are made of heavy rubber sound insulation materials, the damping sound absorption layer 33 is made of an open-cell foam material, and the coupling sound insulation layer 34 is made of a closed-cell foam material.
The damping vibration attenuation layer 31 can perform damping loss on vibration from a rail and a wheel in a wide temperature range, so that the damping vibration attenuation layer can have a good noise reduction effect on friction noise between the rubber pneumatic tire and the rail beam by matching with the heavy sound insulation layer. The damping vibration attenuation layer 31 is a double-sided adhesive damping sheet, and has three functions: firstly, as an adhesive, the outer surface and the outer layer material of the dust cover 1 are connected; secondly, the vibration of the dust cover 1 is reduced; third, a portion of the transfer noise is attenuated.
Coupling puigging 34 can be through the well low frequency noise of the effective isolated bogie of its closed cell structure and braking system, and the porous structure in the damping sound absorbing layer 33 can have syllable-dividing and sound absorbing effect concurrently, has good noise reduction effect to the electromagnetic noise that high frequency motor produced, has promoted rail train's in-car travelling comfort greatly, and the in-car noise reduction effect is greater than more than 13dB, and adopts the compound mode of multilayer to realize the wide band ization of power assembly noise and absorbs.
The open-cell foam material can be a three-dimensional porous material formed by bonding rubber particles by an adhesive, the adhesive can be at least one selected from acrylic adhesive, polyurethane adhesive and silicone-based adhesive, the material of the rubber particles can be at least one selected from nitrile rubber, ethylene propylene diene monomer and butadiene rubber, the particle size of the rubber particles can be 0.5-3 mm, and the porosity and pore volume of the porous rubber material/the volume of the porous rubber material can be 80-95%. The damping sound absorption layer 33 is formed by small and simple rubber particle units to form long-chain molecular sound absorption balls, the long-chain molecular sound absorption balls are connected with each other through physical chains by using an adhesive, a porous structure is formed in the three-dimensional direction, the average noise reduction coefficient is generally above 0.7, the weighting sound insulation quantity can reach above 27 decibels, and the damping sound absorption layer has the noise reduction effect of sound absorption and insulation.
The closed cell ratio of the closed cell foam material is preferably more than 95%, the blocking effect of air inside the material cell on sound wave is more obvious, and the closed cell ratio of the closed cell foam material is more than 95%. The weighted sound insulation quantity of the heavy rubber sound insulation material is preferably above 25 decibels. The damping coefficient of the wide temperature range damping material at the temperature range of minus 10 ℃ to minus 50 ℃ is preferably 0.01-0.5. The thickness of the sound-absorbing damping layer 33 can be 10-50 mm, preferably 10-30 mm, the smaller the rubber particles in the sound-absorbing damping layer 33, the smaller the cells, the higher the density, the better the sound-absorbing and insulating properties, and the more the materialHeavy, but combined with the effect of light weight, the areal density can be from 0.2 to 3.0 kg/m2Preferably 0.2-1.5 kg/m2(ii) a The coupling noise insulation layer 34 may have a thickness of 10-25 mm and an areal density of 0.2-2.7 kg/m2(ii) a The first heavy sound-insulating layer 32 and the second heavy sound-insulating layer 35 may have a thickness of 0.8 to 2mm and an areal density of 2.5 to 7 kg/m2(ii) a The thickness of the damping layer 31 can be 2-8 mm, and the surface density can be 1.5-4.5 kg/m2Since the surface density of the heavy sound insulation layer is greater than that of the damping sound absorption layer 33, a density gradient layer can be formed, and the sound insulation effect is improved.
In order to improve the fireproof effect, the materials of the damping sound absorption layer 33, the coupling sound insulation layer 34, the first heavy sound insulation layer 32, the second heavy sound insulation layer 35 and the damping vibration attenuation layer 31 can all reach the flame retardant grade standard of the European Union N45545-2R1 danger grade HL1 or above, the flame retardant grade is mainly related to the structure of the material and the dosage of the adopted flame retardant, the materials which can reach the flame retardant standard at present are few, and the materials comprise melamine, polyether sulfone resin, rubber, plastics and the like.
The closed-cell foam material can be at least one selected from polyethylene, ethylene propylene diene monomer, silicone rubber and nitrile rubber; the heavy rubber sound insulation material can be an ethylene propylene diene monomer rubber-based sound insulation material and/or an ethylene-vinyl acetate copolymer-based sound insulation material, and the wide temperature range damping material can be at least one selected from butyl benzene rubber, acrylate, nitrile rubber and asphalt damping material.
According to another aspect of the present invention, there is provided a noise reduction method of a rail train, the noise reduction method including the following steps.
Step S1: collecting and analyzing the noise transmitted from the dust cover to the interior of the vehicle, and determining a target noise elimination frequency f;
step S2: according to the formula
And determining the length of the quarter-wave tube, wherein L is the length of the quarter-wave tube, c is the sound velocity in air, and n is a natural number.
Step S3: manufacturing a quarter-wave tube according to the determined length;
step S4: mounting the manufactured quarter-wave tube on a dustproof cover;
step S5: acoustically packaging the areas of the outer surface of the dust cap where the quarter wave tube is not disposed.
In step S1, due to the structural arrangement of the power system, there are differences in the noise transmitted on the different faces of the dust boot, and these differences need to be clarified to accurately design the wavelength tube. Fig. 5 shows a graph of the noise spectrum on a face of the dust cap 1, from which the contributions of the individual frequencies to the total sound pressure level can be derived, four peak frequency points being derived which have a greater influence on the total sound pressure level: 586Hz/73.9dB (SPL), 809Hz/78.9dB (SPL), 891Hz/76.4dB (SPL), 1640Hz/70.8dB (SPL), so a quarter-wave tube length design is made for these four points.
In step S2, according to the formula
The lengths of the quarter-wave tubes are 14.5cm, 10.5cm, 10.6cm and 5.2cm in sequence, so that the lengths of the quarter-wave tubes are 14.5cm, 10.5cm and 5.2cm (the effect of 10.5cm and 10.6cm is not greatly different).
In order to determine the tube diameter of the quarter-wave tube in the noise reduction method of the present invention, in one embodiment, wave tubes having different tube diameter sizes are simulated, respectively, and a target tube diameter size is selected according to the effect achieved by each simulated wave tube. For example, two pipe diameter sizes of 80mm and 100mm are selected under the conditions allowed by simulation and assembly, and then the software simulation is used for determining that the effect of 100mm is better, so that 100mm is selected as the pipe diameter of the quarter-wave pipe.
Optionally, the noise reduction method further comprises: and injecting sealing foam rubber into the gap between the outer surfaces of the quarter-wave tubes.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (11)
1. A dust cover noise reduction structure of a railway train is characterized by comprising a dust cover (1), a plurality of quarter wave tubes (2) and acoustic packaging materials (3), wherein the dust cover (1) is used for covering a power system of the railway train to separate the power system from the interior of the train, the quarter wave tubes (2) are arranged on the outer surface of the dust cover (1), one end of each quarter wave tube (2) is communicated with the interior of the dust cover (1), the other end of each quarter wave tube is closed, and the acoustic packaging materials (3) cover the area, where the quarter wave tubes (2) are not arranged, on the outer surface of the dust cover (1);
the acoustic packaging material (3) comprises a damping vibration reduction layer (31), a first heavy sound insulation layer (32), a damping sound absorption layer (33), a coupling sound insulation layer (34) and a second heavy sound insulation layer (35) which are sequentially arranged from inside to outside, the damping vibration reduction layer (31) is made of a wide-temperature-range damping material, the first heavy sound insulation layer (32) is made of a material, the second heavy sound insulation layer (35) is made of a material which is heavy rubber sound insulation material, the damping sound absorption layer (33) is made of a porous rubber material, and the coupling sound insulation layer (34) is made of a closed-cell foaming material.
2. A dust cover noise reduction structure according to claim 1, wherein the plurality of quarter wave tubes (2) comprises quarter wave tubes (2) of various lengths.
3. A dust cover noise reduction arrangement according to claim 1, wherein the dust cover (1) is provided with a plurality of mounting holes, and each quarter wave tube (2) is plugged into a corresponding mounting hole.
4. A dust cover noise reduction arrangement according to claim 3, characterized in that the quarter wave tube (2) is mounted vertically on the dust cover (1).
5. A dust cover noise reduction arrangement according to claim 3, characterized in that the end of the quarter wave tube (2) inserted into the dust cover (1) is flush with the inner surface of the dust cover (1).
6. A dust cover noise reduction arrangement according to claim 3, characterized in that the quarter wave tubes (2) protrude into the interior of the dust cover (1), the protruding length of each quarter wave tube (2) being equal.
7. A dust cover noise reducing construction according to claim 1, characterized in that the gaps between the outer surfaces of the quarter wave tubes (2) are filled with sealing foam.
8. The dust cover noise reduction structure of claim 1, wherein the porous rubber material is a three-dimensional porous material formed by bonding rubber particles with an adhesive; the closed-cell foam material is at least one selected from polyethylene, ethylene propylene diene monomer, silicone rubber and nitrile rubber; the heavy rubber sound insulation material is an ethylene propylene diene monomer rubber-based sound insulation material and/or an ethylene-vinyl acetate copolymer-based sound insulation material; the wide temperature range damping material is at least one selected from butyl benzene rubber, acrylate, nitrile rubber and asphalt damping material.
9. The method of any one of claims 1-8The dust hood noise reduction structure is characterized in that the length of the quarter-wave tube (2) is defined as L, the target noise elimination frequency is defined as f, and a formula is met
Where c is the speed of sound in air and n is a natural number.
10. A method of noise reduction for a rail train comprising the dust cover noise reduction structure of any one of claims 1-9, the method comprising:
collecting and analyzing the noise transmitted from the dust cover (1) to the interior of the vehicle, and determining a target noise elimination frequency f;
according to the formula
Determining the length of a quarter-wave tube, wherein L is the length of the quarter-wave tube, c is the sound velocity in air, and n is a natural number;
manufacturing a quarter-wave tube according to the determined length;
mounting the manufactured quarter-wave tube on a dustproof cover;
acoustically packaging a region of the outer surface of the dust cap where the quarter wave tube is not disposed.
11. The noise reduction method according to claim 10, further comprising: and injecting sealing foam rubber into the gap between the outer surfaces of the quarter-wave tubes.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1511092A (en) * | 2001-05-22 | 2004-07-07 | �����ɷ� | Sound absorptive protective mat |
| CN2661520Y (en) * | 2003-09-22 | 2004-12-08 | 张桂强 | Noise eliminator for light rail train |
| CN101275488A (en) * | 2007-03-30 | 2008-10-01 | 霓佳斯株式会社 | Soundproof cover |
| CN202193088U (en) * | 2011-09-05 | 2012-04-18 | 左红 | Sound absorption device for trains |
| KR20140041014A (en) * | 2012-09-27 | 2014-04-04 | 한국철도기술연구원 | Reduction apparatus for rolling noise of a train wheel |
| CN103790743A (en) * | 2014-02-18 | 2014-05-14 | 黑龙江工程学院 | Automobile noise reduction system with one-fourth wavelength pipes combined with Helmholtz silencer |
| CN203895110U (en) * | 2013-12-13 | 2014-10-22 | 李巍巍 | Sound-absorption composite material in sandwich structure |
| CN106005043A (en) * | 2016-07-26 | 2016-10-12 | 广西德福特科技有限公司 | Automobile wheel cover sound absorption pad |
| CN206394718U (en) * | 2017-01-13 | 2017-08-11 | 宁波星陆汽车部件有限公司 | A kind of corrosion resistant noise reduction wheel cover of automobile |
| CN107933001A (en) * | 2016-10-13 | 2018-04-20 | 惠州赛力珑新材料有限公司 | Safe and healthy environmental protection silicon decorative material for wall surface and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106985836B (en) * | 2016-12-29 | 2019-04-19 | 比亚迪股份有限公司 | Train steering mechanism and monorail train system with it |
| CN106985869B (en) * | 2016-12-29 | 2019-05-17 | 比亚迪股份有限公司 | For the steering mechanism of track train, track train and Rail Transit System |
-
2018
- 2018-04-28 CN CN201810401224.1A patent/CN110406554B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1511092A (en) * | 2001-05-22 | 2004-07-07 | �����ɷ� | Sound absorptive protective mat |
| CN2661520Y (en) * | 2003-09-22 | 2004-12-08 | 张桂强 | Noise eliminator for light rail train |
| CN101275488A (en) * | 2007-03-30 | 2008-10-01 | 霓佳斯株式会社 | Soundproof cover |
| CN202193088U (en) * | 2011-09-05 | 2012-04-18 | 左红 | Sound absorption device for trains |
| KR20140041014A (en) * | 2012-09-27 | 2014-04-04 | 한국철도기술연구원 | Reduction apparatus for rolling noise of a train wheel |
| CN203895110U (en) * | 2013-12-13 | 2014-10-22 | 李巍巍 | Sound-absorption composite material in sandwich structure |
| CN103790743A (en) * | 2014-02-18 | 2014-05-14 | 黑龙江工程学院 | Automobile noise reduction system with one-fourth wavelength pipes combined with Helmholtz silencer |
| CN106005043A (en) * | 2016-07-26 | 2016-10-12 | 广西德福特科技有限公司 | Automobile wheel cover sound absorption pad |
| CN107933001A (en) * | 2016-10-13 | 2018-04-20 | 惠州赛力珑新材料有限公司 | Safe and healthy environmental protection silicon decorative material for wall surface and preparation method thereof |
| CN206394718U (en) * | 2017-01-13 | 2017-08-11 | 宁波星陆汽车部件有限公司 | A kind of corrosion resistant noise reduction wheel cover of automobile |
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| CN110406554A (en) | 2019-11-05 |
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