CN110455395A - For tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle - Google Patents
For tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle Download PDFInfo
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- CN110455395A CN110455395A CN201910802537.2A CN201910802537A CN110455395A CN 110455395 A CN110455395 A CN 110455395A CN 201910802537 A CN201910802537 A CN 201910802537A CN 110455395 A CN110455395 A CN 110455395A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D63/00—Motor vehicles or trailers not otherwise provided for
- B62D63/06—Trailers
- B62D63/062—Trailers with one axle or two wheels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
- G01H1/12—Measuring characteristics of vibrations in solids by using direct conduction to the detector of longitudinal or not specified vibrations
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Abstract
For tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle, the present invention relates to a kind of near-field test equipment for carrying out noise produced by outdoor tire-road reciprocation, it in order to solve the problems, such as that existing tire-road noise sound test equipment is easily affected by environment and counterweight adjust it is complicated for operation.It is that two leaf springs are arranged in axle that the present invention, which moves weight formula two-wheel noise measuring vehicle, square steel vehicle frame is arranged on leaf spring, four lead screws of lifting device are vertically arranged on the frame body of square steel vehicle frame, otic placode on square frame covers on lead screw, the blimp is located at surrounding and the top of wheel group, microphone accesses outside car body, is fixed below square steel vehicle frame, and microphone is located at the inside of wheel.The present invention controls tire load-carrying come accurate movement balance position by ball-screw to realize, ensure that the practicability of test result as close as vehicle operation result using with single shaft dicycly trailer configuration similar in actual vehicle.
Description
Technical field
The present invention relates to a kind of near-field test equipment for carrying out noise produced by outdoor tire-road reciprocation, specifically
It is related to a kind of for tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle.
Background technique
Road noise includes three kinds of kinetic noise, car body noise and tire-road noise classifications, tire-road therein
Noise is the emphasis of road worker concern.Especially for Noise Reduction Pavement research, evaluating its anti-acoustic capability must be by means of
Reliable tire-road noise measuring system.Since Noise Reduction Pavement mainly solves tire-road noise problem, ordinary traffic noise testing
Method is no longer applicable in, thus develops the equipment for capableing of objective reality reflection tire-road reciprocation generation noise size, right
Noise Reduction Pavement research is of great significance.
Include two methods of near field and far field test at present in terms of the outdoor test of road rumble: (1) far field is surveyed
Examination, it is suitable for evaluating the noise of entire traffic flow；(2) near-field test, it is suitable for the tire of profession-road noise sound researchs.Wherein,
The method of near-field test can be subdivided into two kinds again, it may be assumed that (1) plug-in sound level meter method, the noise that this method measures are all not
Tire-road noise, also by from other vehicles noise and wind make an uproar and influenced.(2) trailer method, this method energy maximum limit
The interference of the reduction ambient noise and reflecting background of degree, more accurately acquires tire-road noise sound, is the survey being worth of widely use
Trial work section.
Can be seen that noise measuring vehicle from above-mentioned narration is for the optimal selection of tire-road noise sound test.What is applied
Using mainly having in trailer method research department cover tire-road noise electroacoustic test device or process patent, " weight type tire/pavement noise is examined
Survey trailer " (application number 200820233821.X) and " double-wheel counter-weight adjustable type tyre road noise measuring vehicle " (application number
201120251986.1), the two patents all devise counterweight loading system, solve foreign correlative study design defect.But
It is that these device structures are complicated and load adjusting is inconvenient, needs to be needed to carry several balance weight irons at any time according to test；Separately
On the one hand, it (specification ISO 11819-2 requirement: makes an uproar interference, acoustic hood bottom and road surface to reduce wind since acoustic hood height fixes
Spacing must not exceed 5cm), cause trailer traveling to be difficult to adapt to complex road condition requirement.Therefore, it is necessary to a kind of operation out newly developed
Easy, accurate testing tire-road noise measuring vehicle.
Summary of the invention
The purpose of the present invention is to solve existing tire-road noise sound test equipment, and easily affected by environment, counterweight adjusts operation
It is complicated and the problem of be difficult to adapt to complex road condition, and develop a kind of for tire-road noise sound test shifting weight formula two-wheel noise
Detect vehicle.
The present invention includes wheel group, leaf spring, square steel vehicle for tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle
Frame, lifting device, loading device, blimp and data collection system are provided with axle between two wheels and form wheel group, In
A leaf spring is respectively set at left and right sides of axle, square steel vehicle frame is horizontally set on two leaf springs by support rod
On；Wherein the loading device is by square frame, linear bearing, straight-line transmitting moving axis, ball screw and counter weight group in side
The inner horizontal of shape frame is horizontal two straight-line transmitting moving axis and a ball screw, and ball screw is located at two straight-line transmitting moving axis
Between and be arranged in parallel with straight-line transmitting moving axis, a linear bearing is arranged on every straight-line transmitting moving axis respectively, clump weight is fixed
On two linear bearings, swing roller screw rod keeps clump weight left and right directions mobile, in addition, the left side frame plate of square frame and the right side
The outer plate surface of lateral shelf plate is respectively set there are two otic placode；
The lifting device includes four lead screws and multiple nuts, and four lead screws of lifting device are vertically arranged in square steel
It on the frame body of vehicle frame, is arranged on every lead screw there are two nut, the otic placode on square frame covers on lead screw and is located at two spiral shells
Between mother, nut above has the function of limitation, fixed square frame displacement, and nut below can control square frame and side
The spacing of steel vehicle frame, to control the terrain clearance of acoustic hood；
The blimp is located at surrounding and the top of wheel group, is additionally provided with intermediate sound insulation between two wheels
Plate；
The data collection system includes multiple microphones, and microphone accesses outside car body, is fixed on square steel vehicle frame
Lower section, microphone is located at the inside of wheel, and is arranged with the nearside wheel wall interval of wheel.
It will include sound-absorbing and sound insulation system, loading system, data acquisition control that the present invention, which moves weight formula two-wheel noise measuring car owner,
The parts such as system, guidance system and field power supply system processed.It can be carried out using the noise measuring vehicle including sound pressure level, sound audio
A variety of acoustics index research including Spectral structure characteristic, more can comprehensively acquire true tire and practical road surface in varying environment
Under acoustic information.
For the interference for avoiding the noises such as engine, exhaust tube, it is unpowered drag that the present invention, which moves weight formula two-wheel noise measuring vehicle,
Acoustic hood is arranged in vehicle outside detection vehicle, and there are enough spacing for guarantee microphone and tractor tyre.Using with uniaxial two-wheel
Structure, the driving status of truer simulation actual tire, simplifies trailer shape, while improving the stability of trailer.
To reduce interfering with each other for two test tires, determine that trailer is surveyed after comprehensively considering the legitimacy and safety of later period upper road traveling
Examination wheel wheelspan, and sound insulationg board is set between two-wheeled.For improve noise measuring vehicle overall stability and applicability, in main body knot
One height-adjustable Universal support wheel is installed in front of structure, and height adjustment device is set on acoustic hood.
The trailer acoustic hood of present invention sound absorption and sound insulation system is based on trailer itself steel skeleton, from outside to inside successively
For steel plate, sound insulating pad, rubber and plastic cotton, rough ground, plane plasterboard, high-elastic polyester fiber acoustical cotton, rough ground, perforating gypsum board and
Polyester of high density fiber acoustical cotton.On the other hand, at all rigid connections of trailer, rubber pad is posted to obstruct vibration
Transmitting.Seam crossing at left and right sides of trailer also has sealing strip, to reduce pouring into for test process apoplexy.Entire acoustic hood
Lifting device is carried, the safe distance of road table and acoustic hood can be controlled by promoting, reducing acoustic hood, to guarantee to test
The accuracy of data and the safety of driving.
The field power supply system is to carry to export through voltage-stablizer after battery is converted with inverter by tractor
Power supply.
The present invention for the shifting of tire-road noise sound test weight formula two-wheel noise measuring vehicle include it is following the utility model has the advantages that
1, tire load-carrying is controlled come accurate movement balance position to realize by ball-screw, has reached quick change tire
Load and the effect for simplifying device structure, under the premise of not needing to load and unload back and forth, increase and decrease balance weight iron, change is can be completed in one
The work of tire load greatly improves the flexibility of equipment, saves manpower and material resources.
2, internal trailer carries lifting device, and the peace of road table and acoustic hood can be controlled by promoting, reducing acoustic hood
Full distance ensure that trailer had not only been able to satisfy test specification requirement, but also perfect can adapt to complex road condition, ensure that the applicability of equipment
And safety.
3, it is protected using with single shaft dicycly trailer configuration similar in actual vehicle as close as vehicle operation result
The practicability of test result has been demonstrate,proved, while having also simplified trailer shape, has improved the stability of trailer.
4, by effective sound-absorbing and sound insulation system, outside noise is shielded to greatest extent and reduces internal noise reflection,
It ensure that tire-road noise sounding test result accuracy.
Detailed description of the invention
Fig. 1 is the overall structure diagram that the present invention moves weight formula two-wheel noise measuring vehicle for tire-road noise sound test；
Fig. 2 is the side cross-sectional structural schematic diagram that weight formula two-wheel noise measuring vehicle is moved for tire-road noise sound test；
Fig. 3 is the top view cross section structural schematic diagram that weight formula two-wheel noise measuring vehicle is moved for tire-road noise sound test；
Fig. 4 is the side structure schematic view of lifting device and loading device；
Fig. 5 is the overlooking structure diagram of loading device；
Fig. 6 is the overlooking structure diagram of square steel vehicle frame；
Fig. 7 is microphone arrangement schematic diagram；
Fig. 8 is the structural schematic diagram of sound insulation cover material.
Specific embodiment
Specific embodiment 1: present embodiment includes for tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle
Wheel group 1, leaf spring 18, square steel vehicle frame 116, lifting device 2, loading device 3, blimp 4 and data collection system, at two
It is provided with axle between wheel and forms wheel group 1, a leaf spring 18, square steel vehicle frame are respectively set at left and right sides of axle
116 are horizontally set on two leaf springs 18 by support rod 17；Wherein the loading device 3 is by square frame 31, straight
Spool holds 32, straight-line transmitting moving axis 33, ball screw 34 and clump weight 35 form, and has two the inner horizontal of square frame 31 is horizontal
Root straight-line transmitting moving axis 33 and a ball screw 34, ball screw 34 is located between two straight-line transmitting moving axis 33 and and Linear transmission
Axis 33 is arranged in parallel, and is arranged with a linear bearing 32 on every straight-line transmitting moving axis 33 respectively, and clump weight 35 is fixed on two directly
Spool is held on 32, and swing roller screw rod 34 keeps 35 left and right directions of clump weight mobile, the left side frame plate and left side frame of square frame 31
The outer plate surface of plate is respectively set there are two otic placode 36；
The lifting device 2 includes four lead screws 21 and multiple nuts 22, and four lead screws 21 of lifting device 2 are set vertically
It sets on the frame body of square steel vehicle frame 116, is arranged on every lead screw 21 there are two nut 22,36 sets of otic placode on square frame 31 exists
On lead screw 21 and it is located between two nuts 22；
The blimp 4 is located at surrounding and the top of wheel group 1, is additionally provided with intermediate sound insulation between two wheels
Plate 44；
The data collection system includes multiple microphones 51, and microphone 51 accesses outside car body, is fixed on square steel
116 lower section of vehicle frame, microphone 51 is located at the inside of wheel, and is arranged with the nearside wheel wall interval of wheel.
Leaf spring described in present embodiment is most widely used a kind of elastic element in automotive suspension, it be by
The spring beam for the approximately equi-strength that if dry plate is wide but the alloy spring piece of Length discrepancy is composed.
Specific embodiment 2: the present embodiment is different from the first embodiment in that being set in the outside of loading device 3
Set arc top cover 11.
Specific embodiment 3: the present embodiment is different from the first and the second embodiment in that being used for tire-road noise sounding
The shifting weight formula two-wheel noise measuring vehicle of examination further includes guiding device, and guiding device includes draw bar 115, support wheel 114 and hydraulic
One end of telescopic rod 113, draw bar 115 is connect with square frame 31, and the other end of draw bar 115 is connect with tractor, is being led
Draw and be vertically arranged with hydraulic telescopic rod 113 on bar 115, the lower part of hydraulic telescopic rod 113 is provided with support wheel 114.
Support wheel in present embodiment is used to support car body, indoor short distance transloading equipment and trailer-erector frame is assisted to arrive
It is used when on tractor, support wheel direction can be adjusted by bottom steering bearing, and support wheel height is by the crank in hydraulic telescopic rod
It adjusts.Further to adapt to different traction heights, draw bar is adjusted with fixed screw and is fixed.Draw bar top is equipped with trailer
Bulb 112 controls the driving direction of trailer for the connection with tractor.In the field test stage, directive wheel passes through hydraulic
Device rises to avoid its caused tire-road noise acoustic jamming test result；In the non-test stage, support wheel is fallen thus with dragging
Two testing wheel thes form of the foetus of vehicle at supported at three point steady state.
Specific embodiment 4: blimp described unlike one of present embodiment and specific embodiment one to three
4 are made of two the first sound insulationg boards, 41, two the second sound insulationg boards 42, top sound insulationg board 43 and intermediate sound insulationg board 44, and two first
Sound insulationg board 41 is located at the front-rear direction of detection vehicle, and two the second sound insulationg boards 42 are located at the left and right directions of detection vehicle, two first every
Sound plate 41 and two the second sound insulationg boards 42 are all connected on square frame 31.
Specific embodiment 5: the top sound insulationg board of present embodiment and blimp 4 unlike specific embodiment four
43 are connected to the lower surface of square steel vehicle frame 116.
Present embodiment blimp passes through lifting device up and down adjustment with vehicle frame, so that it is liftoff to reach change acoustic hood
The purpose of height；In addition, intermediate sound insulationg board center is provided with gap, wherein sound-proof material is clogged, to facilitate wheel when adjusting height
Axis is mobile.In addition, posting the rubber pad of 3mm at rigid connection to obstruct the transmitting of vibration.Connecing at left and right sides of trailer
Also has sealing strip at seam, to reduce pouring into for test process apoplexy.
Specific embodiment 6: the material of blimp 4 unlike one of present embodiment and specific embodiment one to four
Material is from outside to inside successively by steel plate, sound insulating pad, rubber and plastic cotton, the first rough ground, plasterboard, first (high-elastic) polyester fiber sound-absorbing
Cotton, the second rough ground, perforating gypsum board and second (high density) polyester fiber acoustical cotton composition.
Present embodiment first pierces long drive screw to the first rough ground since steel plate, then bores since the second rough ground
Enter long drive screw to the first rough ground, secondly pierces short thread since perforating gypsum board and follow closely to the second rough ground, finally use
Second (high density) polyester fiber acoustical cotton is fitted on perforating gypsum board and is reinforced using nailing by bonding agent.
The structure of present embodiment blimp as shown in figure 8, steel plate, sound insulating pad and rubber and plastic cotton (frame A) represent trailer every
The acoustic material of acoustic shell, because steel vehicle frame can inevitably generate vibration while the car is driving, this can generate low-frequency resonance
Interference noise, while extraneous environmental noise and vehicular traffic noise readily penetrate through steel plate and reach inside, so needing using highly dense
The sound insulating pad of degree and certain thickness rubber and plastic cotton obstruct noise transmission.First rough ground, plasterboard, first (high-elastic) polyester are fine
Dimension acoustical cotton, the second rough ground, perforating gypsum board and the second (high density) polyester fiber acoustical cotton (frame B) represent trailer sound insulation
The sound-absorbing material of cover.It selects sound-absorption coefficient to be not less than 0.9 polyester fiber acoustical cotton, is absorbed by the vesicular structure of its own
Dissipation sound energy, while some cavitys are created by interting rough ground between acoustical cotton, it is propagation of the noise in acoustical cotton
The condition of multiple reflections is provided with sound wave of decaying.
Specific embodiment 7: present embodiment and the material of blimp 4 unlike specific embodiment six by outside to
Inside successively by 2mm steel plate, 3mm sound insulating pad, 3cm rubber and plastic cotton, the first rough ground of 2cm, 1cm plasterboard, 5cm first (high-elastic) polyester
Fiber acoustical cotton, the second rough ground of 2cm, 1cm perforating gypsum board and 1cm second (high density) polyester fiber acoustical cotton composition.
Specific embodiment 8: data collection system unlike one of present embodiment and specific embodiment one to seven
It further include digital anemometer and Non-contacting Infrared Thermometer, using the wind speed size during digital anemometer monitoring and test,
Using the temperature on Non-contacting Infrared Thermometer test road surface and wheel.
Present embodiment use Tyke graceful split type digital anemometer TD8901, resolution ratio 0.1m/s, can be fixed on
Near microphone is level, for the wind speed size during monitoring and test, it is desirable that be no more than 5m/s, the acoustic pressure otherwise acquired
Data invalid；The equipment can also measure ambient air temperature simultaneously, and 0.2 DEG C of resolution ratio.Using Non-contacting Infrared Thermometer
Road surface and tyre temperature are obtained, precision is 0.1 DEG C.
Specific embodiment 9: in square steel vehicle frame unlike one of present embodiment and specific embodiment one to eight
There are four otic placode 117, lead screw 21 is welded on the surface of otic placode 117 vertically for 116 settings.
Embodiment: the present embodiment includes wheel group 1, steel plate for tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle
Spring 18, square steel vehicle frame 116, lifting device 2, loading device 3, blimp 4 and data collection system are set between two wheels
It is equipped with axle and forms wheel group 1, a leaf spring 18 is respectively set at left and right sides of axle, square steel vehicle frame 116 passes through support
Bar 17 is horizontally set on two leaf springs 18 (i.e. support rod 17 is arranged on leaf spring 18)；Wherein load dress
It sets 3 to be made of square frame 31, linear bearing 32, straight-line transmitting moving axis 33, ball screw 34 and clump weight 35, in square frame 31
Inner horizontal it is horizontal have two straight-line transmitting moving axis 33 and a ball screw 34, ball screw 34 is located at two straight-line transmitting moving axis
It is arranged in parallel between 33 and with straight-line transmitting moving axis 33, is arranged with a linear bearing 32 on every straight-line transmitting moving axis 33 respectively, matches
Pouring weight 35 is fixed on two linear bearings 32, and swing roller screw rod 34 keeps 35 left and right directions of clump weight mobile, square frame 31
Left side frame plate and the outer plate surface of right side frame plate be respectively set there are two otic placode 36；
The lifting device 2 includes four lead screws 21 and multiple nuts 22, and four lead screws 21 of lifting device 2 are set vertically
It sets on the frame body of square steel vehicle frame 116, is arranged on every lead screw 21 there are two nut 22,36 sets of otic placode on square frame 31 exists
On lead screw 21 and it is located between two nuts 22；
The blimp 4 is by two the first sound insulationg boards, 41, two the second sound insulationg boards 42, top sound insulationg board 43 and middle interval
Sound plate 44 forms, and two the first sound insulationg boards 41 are located at the front-rear direction of detection vehicle, and two the second sound insulationg boards 42 are located at detection vehicle
Left and right directions, two the first sound insulationg boards 41 and two the second sound insulationg boards 42 are all connected in the circumferential direction of square frame 31, top every
Sound plate 43 is connected to the lower surface of square steel vehicle frame 116, and intermediate sound insulationg board 44, intermediate sound insulationg board are additionally provided between two wheels
44 are connected on the sound insulationg board 43 of top；
The data collection system includes multiple microphones 51, airspeedometer and Non-contacting Infrared Thermometer, microphone
51 are fixed on 116 lower section of square steel vehicle frame, and the angle that microphone 51 is presented 45 ° and 135 ° with direction of advance respectively is arranged, distance wheel
The horizontal distance of tire inner sidewall is 200mm, and the vertical range apart from ground is 100mm, and diameter is selected to be not less than the wind ball of 45mm,
Reduce the influence that test process apoplexy is made an uproar etc. to microphone.
The present embodiment uses popularity MP201 type sound pressure sensor, MA231 type preamplifier and VA-Lab electroacoustical measurement
System software composition data acquisition control system realizes measurement and data processing to noise.
The present embodiment uses Tyke graceful split type digital anemometer TD8901, resolution ratio 0.1m/s, can be solid by axle
Be scheduled on microphone it is level near, for the wind speed size during monitoring and test, it is desirable that be no more than 5m/s, otherwise acquire
Acoustic pressure data it is invalid；The equipment can also measure ambient air temperature simultaneously, and 0.2 DEG C of resolution ratio.
The present embodiment obtains road surface and tyre temperature using Non-contacting Infrared Thermometer, and precision is 0.1 DEG C.
The present embodiment for tire-road noise sound test move weight formula two-wheel noise measuring vehicle overall dimensions be about long 3.5m ×
Wide 2.25m × high 1.4m.
The present embodiment moves the acoustic hood of weight formula two-wheel noise measuring vehicle and being adjusted for ground for tire-road noise sound test
Spacing is 0-15cm, and the unilateral adjustable load-carrying range of tire is 400-600kg.
The present embodiment moves the test accuracy confirmatory experiment of weight formula two-wheel noise measuring vehicle such as tire-road noise sound test
Under:
In order to prove the noise basis sheet of acquisition from tire-road contact noise, therefore, to assure that acoustic hood can completely cut off
Ambient noise, while the reflecting background inside acoustic hood is absorbed as far as possible, to illustrate the sound source of equipment acquisition in tire-
Road rumble.
Ambient noise
The ambient noise of test process includes extraneous vehicular traffic noise, ambient noise etc., in order to illustrate the sound of acquisition
Not by the interference of ambient noise, verified using best tire-road combined method.Operating process is as follows:
(1) low noise tire is used first, one layer of road surface upper berth, blanket is tested to simulate asphalt road surface,
This Work condition analogue is in tire-road noise sound very little, car body own mechanical noise, Anterior crossbite vehicle noise, other traffic noises outside vehicle
Deng the ambient noise size constituted.
(2) then, comparison uses noise situations of the conventional tyre on plain asphalt road surface, this Work condition analogue includes background
Noise situations when actually detected including noise, tire-road noise sound.
(3) finally, the difference of comparison (1) and (2) collected noise sound twice.
Although the audio frequency range that the mankind can experience be 20Hz-20000Hz, human ear to Middle and low frequency noise more
Good sensitivity.According to the requirement of specification ISO 11819-2, if whole section 1/3 than operating condition (1) on 500-5000Hz of operating condition (2)
The high 6dB of octave noise perhaps whole section third-octave noise high 4dB of the high 1dB of each frequency range on 315-400Hz or every
A high 2dB of frequency range can just think noise basis sheet measured by microphone from tire-road noise sound.Because it is more complicated to measure situation,
It is difficult to ensure that each frequency range has the difference of 1dB or 2dB, so unified standard is the sound pressure level of entire 315-5000Hz frequency range
When high 10dB, the interference that can ignore that ambient noise when test can be proved.
Below for when speed is 50km/h, whether detection ambient noise has an impact to test result, operating condition (1): low
Noise tire+carpet；Operating condition (2): normal tire+bituminous pavement.Operating condition (1) noise size is L at this timem=84.59dB, operating condition
(2) noise size is Lbgm=71.67dB.It is noted that the synthesis of sound pressure level and decomposition operation are not that simple plus-minus is transported
It calculates, sound pressure level directly cannot be added and subtracted mutually, it is necessary to operation is carried out with form of energy, therefore, according to the Superposition Formula of sound pressure level:
In formula: Lm--- the sound pressure level (dB (A)) of actual test；
Lbgm--- the sound pressure level (dB (A)) of ambient noise；
L --- the true sound pressure level of tested point (dB (A))；
It is 84.36dB that true tire/road rumble sound pressure level size, which is calculated, compared with the 84.59dB of actual measurement, difference
Only 0.23dB differs very little, so why this standardizes operating condition (2) than operating condition (1) in 315-5000Hz if also just being explained
It can be seen that the reason of measured result can ignore ambient noise interference when the high 10dB of the sound pressure level of frequency range.Therefore, towing equipment
The noise result of acquisition is hardly influenced by ambient noise, and true acoustic pressure can be replaced with the sound pressure level of actual test
Grade.
Reflecting background
The noise that reflecting background in test process is primarily referred to as the sending of tire-road reciprocation comes inside acoustic hood
Noise caused by reflecting is returned, reflecting background can be fully absorbed in order to illustrate the sound-absorbing material inside acoustic hood, guarantee acquisition
Sound not by the interference of reflecting background, determine to be verified using sound source modeling method.Operating process is as follows:
(1) firstly, removing tire, a sound level is suitable with tire-contact area to be measured much higher than ambient noise, size
Loudspeaker, be placed on the position of original tire and ground face contact, play tire-road noise sound audio for recording in advance, then completely
Close acoustic hood (being consistent with actual test state), it is ensured that there are normal gap between acoustic hood and ground, test noise is big
Small L1。
(2) then, acoustic hood is removed, making an uproar when microphone and loudspeaker are placed in identical position, acquire without acoustic hood
Sound size L2。
(3) finally, the difference of comparison (1) and (2) collected noise sound twice.
It is required that the noise without acoustic hood is than there is whole section third-octave of the noise of acoustic hood on 315Hz-5000Hz to make an uproar
Sound pitch 3dB can think that noise measured by microphone does not include reflecting background.
Corresponding operating condition (1), the sound pressure level of noise is L at this time1=60.98dB；To operating condition (2), the sound pressure level of noise at this time
For L2=64.75dB.The two differs 3.77dB.It is therefore contemplated that the inside sound-absorbing effect of acoustic hood is good, it can satisfy and adopt
The requirement that the sound of collection is not interfered by reflecting background.
Claims (9)
1. for tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle, it is characterised in that this is used for tire-road noise sound test
Moving weight formula two-wheel noise measuring vehicle includes wheel group (1), leaf spring (18), square steel vehicle frame (116), lifting device (2), load dress
(3), blimp (4) and data collection system are set, axle is provided between two wheels and forms wheel group (1), on a left side for axle
A leaf spring (18) is respectively set in right two sides, and square steel vehicle frame (116) is horizontally set on two steel plates by support rod (17)
On spring (18)；Wherein the loading device (3) is by square frame (31), linear bearing (32), straight-line transmitting moving axis (33), rolling
Ballscrew (34) and clump weight (35) composition, the inner horizontal of square frame (31) it is horizontal have two straight-line transmitting moving axis (33) and
A piece ball screw (34), ball screw (34) are located between two straight-line transmitting moving axis (33) and parallel with straight-line transmitting moving axis (33)
It is arranged, is arranged with a linear bearing (32) respectively on every straight-line transmitting moving axis (33), clump weight (35) is fixed on two straight lines
On bearing (32), swing roller screw rod (34) keeps clump weight (35) left and right directions mobile, the left side frame plate of square frame (31) and
The outer plate surface of right side frame plate is respectively set there are two otic placode (36)；
The lifting device (2) includes four lead screws (21) and multiple nuts (22), four lead screws (21) of lifting device (2)
It is vertically arranged on the frame body of square steel vehicle frame (116), is arranged on every lead screw (21) there are two nut (22), square frame (31)
On otic placode (36) cover on lead screw (21) and be located between two nuts (22)；
The blimp (4) is located at surrounding and the top of wheel group (1), is additionally provided with intermediate sound insulation between two wheels
Plate (44)；
The data collection system includes multiple microphones (51), and microphone (51) is fixed below square steel vehicle frame (116), is passed
Sound device (51) is located at the inside of wheel, and is arranged with the nearside wheel wall interval of wheel.
2. according to claim 1 for tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle, it is characterised in that
Arc top cover (11) are arranged in the external of loading device (3).
3. according to claim 1 for tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle, it is characterised in that use
In tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle further include guiding device, guiding device include draw bar (115),
One end of support wheel (114) and hydraulic telescopic rod (113), draw bar (115) is connect with square frame (31), draw bar (115)
The other end connect with tractor, hydraulic telescopic rod (113) are vertically arranged on draw bar (115), in hydraulic telescopic rod
(113) lower part is provided with support wheel (114).
4. according to claim 1 for tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle, it is characterised in that institute
The blimp (4) stated is by two the first sound insulationg boards (41), two the second sound insulationg boards (42), top sound insulationg board (43) and intermediate sound insulation
Plate (44) composition, two the first sound insulationg boards (41) are located at the front-rear direction of detection vehicle, and two the second sound insulationg boards (42) are located at detection
The left and right directions of vehicle, two the first sound insulationg boards (41) and two the second sound insulationg boards (42) are all connected on square frame (31).
5. according to claim 4 for tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle, it is characterised in that every
The top sound insulationg board (43) of sound cover (4) is connected to the lower surface of square steel vehicle frame (116).
6. according to claim 1 for tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle, it is characterised in that every
The material of sound cover (4) is from outside to inside successively by steel plate, sound insulating pad, rubber and plastic cotton, the first rough ground, plasterboard, the first polyester fiber
Acoustical cotton, the second rough ground, perforating gypsum board and the second polyester fiber acoustical cotton composition.
7. according to claim 6 for tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle, it is characterised in that every
The material of sound cover (4) is from outside to inside successively by 2mm steel plate, 3mm sound insulating pad, 3cm rubber and plastic cotton, the first rough ground of 2cm, 1cm gypsum
Plate, the first polyester fiber of 5cm acoustical cotton, the second rough ground of 2cm, 1cm perforating gypsum board and 1cm the second polyester fiber acoustical cotton group
At.
8. according to claim 1 for tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle, it is characterised in that number
It further include digital anemometer and Non-contacting Infrared Thermometer according to acquisition system, during digital anemometer monitoring and test
Wind speed size, using the temperature on Non-contacting Infrared Thermometer test road surface and wheel.
9. according to claim 1 for tire-road noise sound test shifting weight formula two-wheel noise measuring vehicle, it is characterised in that
There are four otic placode (117), lead screw (21) is welded on the surface of otic placode (117) vertically for square steel vehicle frame (116) setting.
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| CN201910802537.2A CN110455395B (en) | 2019-08-28 | 2019-08-28 | Weight-moving type double-wheel noise detection vehicle for tire-road noise test |
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