CN105628170A - Method for measuring and calculating reverberation time in vehicle - Google Patents
Method for measuring and calculating reverberation time in vehicle Download PDFInfo
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Abstract
The invention provides a method for measuring and calculating the reverberation time in a vehicle. The method comprises a step S1 of calculating an original average value of the measured sound source sound pressure; a step S2 of setting a first value of the sound source sound pressure before attenuation and a second value after attenuation at each measuring point in the vehicle respectively according to the original average value of the sound source sound pressure; a step S3 of calculating the sound pressure attenuation slope at each measuring point according to the difference between the first value and the second value and the time of linear attenuation from the first value to the second value; and a step S4 of calculating the reverberation time of the measuring points according to the sound pressure attenuation slope at each measuring point. According to the invention, the average reverberation time in the vehicle is calculated according to the sound pressure attenuation slope, and in this way, the acoustical absorption coefficient of acoustic materials in the vehicle can be evaluated, so as to provide a basis for analyzing and improving the acoustic absorption property of the acoustic materials. In addition, the process is completed when the vehicle is in a static state, no frequent road test is required, the manpower and material resources and the cost are saved, and repeated verification and continuous improvement are carried out at all stages of development.
Description
Technical field
The present invention relates to car acpistocs technical field, particularly relate to measurement and the computational methods of average reverberation time in a kind of car.
Background technology
In car acpistocs engineering development process, general first performance according to acoustics in the car of market competition vehicle sets noise technique index system. Obviously, in car, acoustical behavior depends directly on the human ear Auditory Perception process to sound event, and internal car noise is made the judgement of subjective sensation by people simultaneously in this process. , for car acpistocs engineer, being inadequate only according to subjective assessment car acpistocs characteristic, before this, acousticians have studied a lot of objective parameters,acoustic to describe sound quality, and this is evaluate and improve car acpistocs performance to provide important foundation. It is applied in the physical quantity on car acpistocs at present very many, than if any reverberation time, loudness, sharpness, roughness, speech intelligibility etc. And inside disclosed document, it does not have inventor have found that the method being used for the reverberation time acoustic surrounding in car being analyzed and improving. Further, at present for the measurement of sound absorbing capabilities in car, it is mostly realized by the examination of actual road under dynamic operation condition. If to be used for the reverberation time acoustic surrounding in car being analyzed and improving, then need the road examination of several times to carry out debugging or verifying, not only make process multifarious, be also consumed by a large amount of manpower and materials, very uneconomical.
Summary of the invention
The technical problem to be solved is in that, measurement and the computational methods of reverberation time in a kind of car can implemented under static operating mode are provided, this physical index of reverberation time can be obtained without passing through dynamic operation condition road examination frequently, provide basis for analyzing and evaluate absorbing property in car quickly and easily.
In order to solve above-mentioned technical problem, the present invention provides measurement and the computational methods of reverberation time in a kind of car, including:
Step S1, calculates the surveyed original meansigma methods of sound source acoustic pressure;
Step S2, according to the described original meansigma methods of sound source acoustic pressure, sets the first value before the sound source acoustic pressure decay of each measuring point in car and the second value after decay respectively;
Step S3, the difference according to described first value and the second value, and it is worth the linear attenuation time to described second value from described first, calculate the acoustic pressure attenuation slope of each measuring point respectively;
Step S4, calculates the reverberation time obtaining described measuring point according to the acoustic pressure attenuation slope of described each measuring point.
Wherein, described step S1 specifically includes:
The steady statue noise signal that before decaying according to described sound source acoustic pressure, each measuring point in car receives, automatically calculates each frequency band sound pressure level, then seeks its meansigma methods.
Wherein, described first value deducts the first adjusted value for the described original meansigma methods of sound source acoustic pressure, and described second value deducts the second adjusted value for the described original meansigma methods of sound source acoustic pressure.
Wherein, described first adjusted value value is 5, and described second adjusted value value is 35.
Wherein, described acoustic pressure attenuation slope is obtained to the time of described second value divided by described first value linear attenuation by the difference of described first value and the second value.
Wherein, the described reverberation time is obtained divided by described acoustic pressure attenuation slope by 60.
Wherein, also include:
Step S5, averaged to the reverberation time of described each measuring point, it is thus achieved that the average reverberation time of each measuring point.
Wherein, also include:
It is arranged in car by sound source diverse location, often changes a position, namely perform once described step S2-S5, and the reverberation time of the described each measuring point obtained when sound source is positioned at diverse location averages, it is thus achieved that the average reverberation time in car.
Implement the present invention to be had the benefit that according to the reverberation time average in the calculated car of acoustic pressure attenuation slope, the acoustic absorptivity of acoustical material in car can be evaluated, thus the sound absorbing capabilities for analyzing and improve acoustical material provides the foundation. And, these processes all complete when vehicle static, try without frequent road, use manpower and material resources sparingly and cost, also can the sound absorption improvement project of engineering sample car progressively corresponding implement after, PT1, the PT2(PrototypeTest follow-up) preproduction car and SOP(StartofProduction) the volume production car incipient stage repeatedly verifies and updates. Except the reverberation time average in car, the reverberation time of each measuring point can be used for evaluating the sound absorbing capabilities of zones of different sound-absorbing material in the car of place, is improved with specific aim.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of the measurement of reverberation time in a kind of car of the embodiment of the present invention and computational methods.
Fig. 2 is acoustic pressure attenuation curve schematic diagram in the embodiment of the present invention.
Fig. 3 is the relation curve schematic diagram of reverberation time and acoustic absorptivity in the embodiment of the present invention.
Fig. 4 is the layout schematic diagram of sound source and microphone in the embodiment of the present invention.
Fig. 5 is experimental model and the sound pressure level attenuation curve schematic diagram with reference to car in the embodiment of the present invention.
Fig. 6 is experimental model and the interior average reverberation time curve synoptic diagram of car with reference to car in the embodiment of the present invention.
Fig. 7 is the acoustic absorptivity correlation curve schematic diagram that in the embodiment of the present invention, acoustical material improves front and back.
Detailed description of the invention
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
Refer to shown in Fig. 1, the embodiment of the present invention one provides measurement and the computational methods of reverberation time in a kind of car, including:
Step S1, calculates the surveyed original meansigma methods of sound source acoustic pressure;
Step S2, according to the described original meansigma methods of sound source acoustic pressure, sets the first value before the sound source acoustic pressure decay of each measuring point in car and the second value after decay respectively;
Step S3, the difference according to described first value and the second value, and it is worth the linear attenuation time to described second value from described first, calculate the acoustic pressure attenuation slope of each measuring point respectively;
Step S4, calculates the reverberation time obtaining described measuring point according to the acoustic pressure attenuation slope of described each measuring point.
Hereinafter each step is specifically described.
The original meansigma methods of sound source acoustic pressure in step S1, the steady statue noise signal that before being the decay of sound source acoustic pressure, the microphone of each point layout in car receives, automatically calculate, by acoustical material systems soft ware, the meansigma methods that then each frequency band sound pressure level takes, the present embodiment is designated as Yavg��
In step S2, it is contemplated that in the ideal case, sound pressure level and time are linear, and background noise is of a sufficiently low, therefore can set that sound source acoustic pressure from the first value be linear attenuation to the second value, wherein, first value of the present embodiment is set to Y1, the second value is set to Y2. As in figure 2 it is shown, the first value Y1The value after a period of time is stablized, close to Y for sound source acoustic pressure original valueavg, show as YavgDeduct the first adjusted value R1, the corresponding time is designated as T1; And the second value Y2Then close to the stationary value after decay, show as YavgDeduct the second adjusted value R2, the corresponding time is designated as T2. Reasonable set is worth Y from first1It is worth Y to second2Linear decrement, contribute to the present invention calculating to acoustic pressure attenuation slope and reverberation time.
As an example, R1Value is 5, R2Value is 35.
Thus, in step S3, acoustic pressure attenuation slope (is designated as Slope) and is obtained by following manner calculating:
Slope=�� Y/ �� T=(Y2�CY1)/(T2�CT1)
Owing to being acoustic pressure decay, the second value Y2It is less than the first value Y1, the acoustic pressure attenuation slope therefore drawn is also for negative value.
The definition considering the reverberation time is that sound field reaches stable state, after sound source stops sounding, sound pressure level reduces the time required for 60dB, therefore, after step S3 calculates the acoustic pressure attenuation slope Slope obtaining measuring point, step S4 calculating reverberation time (being designated as RT) can be obtained by following manner:
RT=�C60/Slope
Namely the reverberation time is on the linear attenuation curve of same slope, the time needed for acoustic pressure decay 60dB.
By after the reverberation time that above-mentioned flow process obtains each measuring point, the present embodiment also includes:
Step S5, averaged to the reverberation time of described each measuring point, it is thus achieved that the average reverberation time of each measuring point.
Additionally, above-mentioned steps S1 is the calculating original meansigma methods of sound source acoustic pressure when sound source is positioned at a certain position, for making every effort to the accuracy calculating the reverberation time, the embodiment of the present invention also includes: be arranged in car by sound source diverse location, often change a position, namely perform a step S2-S5, and the average reverberation time of the described each measuring point obtained when sound source is positioned at diverse location averages, it is thus achieved that the average reverberation time in car.
The present embodiment calculates the analysis and improvement that obtain the reverberation time and be applied in car acoustic surrounding, realizes mainly by the relation set up in reverberation time and car between the acoustic absorptivity of acoustical material. Owing to car inner volume is constant, and the surface area of acoustical material is also by measuring and calculating, and when volume and surface area are known, can immediately determine that reverberation time RT and the relation of acoustic absorptivity a according to Sabine formula.
According to definition, the mean free path L between two secondary reflections closed in space is: L=4V/S, and wherein V is volume, and S is surface area; When a��0.3, directly utilizing Sabine(Sa guest) formula a=0.041L/T can calculate acoustic absorptivity a; And as a > 0.3 time, according to Eyring(Ealing) to the revised expression formula a of Sabine formulaEyr=0.041L/ (ln (1 a)), can draw than Sabine formula closer to actual result. For another example Fig. 3, runs a curve figure in conjunction with the result of calculation of Sabine formula and Eyring formula and reverberation time, it is thus possible to represent the relation of material acoustic absorptivity and reverberation time in car intuitively: the reverberation time is more long, then acoustic absorptivity is more little. According to Sabine formula T60=0.163V/a, owing to same level vehicle interior volume V difference is only small, therefore in the big then car of acoustic absorptivity a the average reverberation time just short.
Therefore, according to the reverberation time average in the calculated car of acoustic pressure attenuation slope, the acoustic absorptivity of acoustical material in car can be evaluated, thus the sound absorbing capabilities for analyzing and improve acoustical material provides the foundation. And, these processes all complete when vehicle static, try without frequent road, use manpower and material resources sparingly and cost, also can the sound absorption improvement project of engineering sample car progressively corresponding implement after, PT1, the PT2(PrototypeTest follow-up) preproduction car and SOP(StartofProduction) the volume production car incipient stage repeatedly verifies and updates. Except the reverberation time average in car, the reverberation time of each measuring point can be used for evaluating the sound absorbing capabilities of region sound-absorbing material, is improved with specific aim.
Below in conjunction with an example, the measurement of parameter, the process of calculation analysis such as average reverberation time and acoustic absorptivity are described.
Advancing equipment and test is come: front-seat in car respectively and heel row respectively arranges two microphones (totally 4) shown in Fig. 4, and sound source (1) is successively placed on 6 positions (Fig. 2 illustrates 3 positions) respectively, console (sound source mouth is respectively forward and backward), IP (InstrumentPanel) left end and right-hand member (sound source mouth is backwards), hat rack left end and rear end (sound source mouth is forward). Obtain experimental model, reference car 1 and the acoustic pressure attenuation curve with reference to car 2 three chassis respectively. When adopting the excitation of same sound source and point layout, as it is shown in figure 5, the original average sound pressure value of experimental model is maximum, acoustic pressure decays also the slowest, secondly be with reference to car 1, and decaying the fastest is reference car 2. And the average reverberation time in the car of three chassis, as shown in Figure 6, at more than 500Hz, the average reverberation time of experimental model is about 120ms, the longest; Secondly it is with reference to car 1; The shortest is with reference to car 2, is about 100ms. From acoustic pressure attenuation slope and the Che Nei average reverberation time, the gap that sample car examines car with two Radix codonopsis pilosulae is all very prominent.
Can correspondence make improvements after judging, by the reverberation time, the sound absorbing capabilities that sound-absorbing material is current, such as the acoustical material inside front panel adopts PU foam pad scheme, after simultaneously thickness increases 10mm, shown in Figure 7, acoustic absorptivity each main frequency range totally to improve effectiveness comparison obvious.
Above disclosed it is only present pre-ferred embodiments, certainly can not limit the interest field of the present invention, the equivalent variations therefore made according to the claims in the present invention with this, still belong to the scope that the present invention contains.
Claims (8)
1. the measurement of reverberation time and computational methods in car, including:
Step S1, calculates the surveyed original meansigma methods of sound source acoustic pressure;
Step S2, according to the described original meansigma methods of sound source acoustic pressure, sets the first value before the sound source acoustic pressure decay of each measuring point in car and the second value after decay respectively;
Step S3, the difference according to described first value and the second value, and it is worth the linear attenuation time to described second value from described first, calculate the acoustic pressure attenuation slope of each measuring point respectively;
Step S4, calculates the reverberation time obtaining described measuring point according to the acoustic pressure attenuation slope of described each measuring point.
2. method according to claim 1, it is characterised in that described step S1 specifically includes:
The steady statue noise signal that before decaying according to described sound source acoustic pressure, each measuring point in car receives, automatically calculates each frequency band sound pressure level, then seeks its meansigma methods.
3. method according to claim 2, it is characterised in that described first value deducts the first adjusted value for the described original meansigma methods of sound source acoustic pressure, and described second value deducts the second adjusted value for the described original meansigma methods of sound source acoustic pressure.
4. method according to claim 3, it is characterised in that described first adjusted value value is 5, described second adjusted value value is 35.
5. method according to claim 3, it is characterised in that described acoustic pressure attenuation slope is worth linear attenuation by the difference of described first value and the second value divided by described first and obtains to the time of described second value.
6. method according to claim 5, it is characterised in that the described reverberation time is obtained divided by described acoustic pressure attenuation slope by 60.
7. method according to claim 6, it is characterised in that also include:
Step S5, averaged to the reverberation time of described each measuring point, it is thus achieved that the average reverberation time of each measuring point.
8. method according to claim 7, it is characterised in that also include:
It is arranged in car by sound source diverse location, often changes a position, namely perform once described step S2-S5, and the average reverberation time of the described each measuring point obtained when sound source is positioned at diverse location averages again, it is thus achieved that the average reverberation time in final car.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018024058A1 (en) * | 2016-08-02 | 2018-02-08 | 电信科学技术研究院 | Reverberation time estimation method and apparatus |
| CN108613736A (en) * | 2018-04-20 | 2018-10-02 | 中车青岛四方机车车辆股份有限公司 | Damping loss factor test method, device and system |
| CN109506962A (en) * | 2018-11-28 | 2019-03-22 | 中车长春轨道客车股份有限公司 | Acoustic absorptivity test method in track train drivers' cab based on vehicle semianechoic room |
| CN111341345A (en) * | 2020-05-21 | 2020-06-26 | 深圳市友杰智新科技有限公司 | Control method and device of voice equipment, voice equipment and storage medium |
| CN111535470A (en) * | 2020-05-09 | 2020-08-14 | 广州大学 | Method and system for improving indoor language definition |
| CN112067319A (en) * | 2020-08-24 | 2020-12-11 | 安徽江淮汽车集团股份有限公司 | Tire noise testing method, device, equipment and storage medium |
| CN113569434A (en) * | 2021-09-26 | 2021-10-29 | 西南交通大学 | Method for predicting spatial reverberation time of railway tunnel in vehicle state |
| CN114166949A (en) * | 2021-10-27 | 2022-03-11 | 东风汽车集团股份有限公司 | In-vehicle acoustic absorption test method, device and equipment |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018024058A1 (en) * | 2016-08-02 | 2018-02-08 | 电信科学技术研究院 | Reverberation time estimation method and apparatus |
| CN108613736A (en) * | 2018-04-20 | 2018-10-02 | 中车青岛四方机车车辆股份有限公司 | Damping loss factor test method, device and system |
| CN108613736B (en) * | 2018-04-20 | 2021-02-09 | 中车青岛四方机车车辆股份有限公司 | Damping loss factor testing method, device and system |
| CN109506962A (en) * | 2018-11-28 | 2019-03-22 | 中车长春轨道客车股份有限公司 | Acoustic absorptivity test method in track train drivers' cab based on vehicle semianechoic room |
| CN111535470A (en) * | 2020-05-09 | 2020-08-14 | 广州大学 | Method and system for improving indoor language definition |
| CN111535470B (en) * | 2020-05-09 | 2021-11-19 | 广州大学 | Method and system for improving indoor language definition |
| CN111341345A (en) * | 2020-05-21 | 2020-06-26 | 深圳市友杰智新科技有限公司 | Control method and device of voice equipment, voice equipment and storage medium |
| CN112067319A (en) * | 2020-08-24 | 2020-12-11 | 安徽江淮汽车集团股份有限公司 | Tire noise testing method, device, equipment and storage medium |
| CN112067319B (en) * | 2020-08-24 | 2021-09-28 | 安徽江淮汽车集团股份有限公司 | Tire noise testing method, device, equipment and storage medium |
| CN113569434A (en) * | 2021-09-26 | 2021-10-29 | 西南交通大学 | Method for predicting spatial reverberation time of railway tunnel in vehicle state |
| CN114166949A (en) * | 2021-10-27 | 2022-03-11 | 东风汽车集团股份有限公司 | In-vehicle acoustic absorption test method, device and equipment |
| CN114166949B (en) * | 2021-10-27 | 2024-04-02 | 东风汽车集团股份有限公司 | In-vehicle sound absorption testing method, device and equipment |
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