CN108122560A - A kind of system and method for extracting engine noise tone degree - Google Patents
A kind of system and method for extracting engine noise tone degree Download PDFInfo
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- CN108122560A CN108122560A CN201611062356.3A CN201611062356A CN108122560A CN 108122560 A CN108122560 A CN 108122560A CN 201611062356 A CN201611062356 A CN 201611062356A CN 108122560 A CN108122560 A CN 108122560A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 238000000605 extraction Methods 0.000 claims description 11
- 238000001228 spectrum Methods 0.000 claims description 8
- 230000004888 barrier function Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 5
- 230000003321 amplification Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
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Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
- G10L21/0324—Details of processing therefor
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
- G10L25/18—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being spectral information of each sub-band
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Signal Processing (AREA)
- Audiology, Speech & Language Pathology (AREA)
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- Computational Linguistics (AREA)
- Acoustics & Sound (AREA)
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Abstract
A kind of system and method for extracting engine noise tone degree, and in particular to a kind of test engine noise under whole vehicle state simultaneously extracts the system and method for its tone degree.Its device includes computer, gain amplifier, analog/digital conversion plate, microphone and its stent.Its method is that first test vehicle is parked in anechoic room rotating hub；Three generators are arranged in the sound pressure level under each operating mode of engine environment test；Test data is analyzed and processed, extract tonal content and calculates sound scheduling result.Present system is easily achieved, simple operation, and measuring accuracy is high, is had wide applicability, has been filled up the blank of engine noise testing field.
Description
Technical field
The present invention relates to engine work noise testing fields, and in particular to one kind test engine under whole vehicle state is made an uproar
Sound and the system and method for extracting engine noise tone degree.
Background technology
Tone, loudness and tone color are to evaluate 3 elements of sound.Tone is one of major influence factors of psychologic acoustics,
The height of pure tone ingredient in representative voice.Lack means measured directly for the height of tone at present, typically with letter
Number processing means identify tonal content on sound spectrum and calculate the ratio shared by it.
Engine noise is the Main Noise Sources of automobile, is to discriminate between one of an important factor for automobile brand is fine or not.Engine
Noise except in addition to the parameter evaluations such as acoustic pressure, acoustical power, more and more psychoacoustic parameters are used in recent years, as loudness,
Tone degree, sharpness etc..Its medium pitch degree is significant for the quality and engine diagnosis of engine evaluated noise.
In order to obtain higher measuring accuracy, often made an uproar in engineering using stand test method measurement engine in anechoic room
Sound.This method needs the supports such as dedicated frock clamp, rat tail and engine off-line calibration file, therefore test process
Complexity takes time and effort.
Engine noise is tested under whole vehicle state in conclusion the present invention designs one kind, and is directly extracted
Go out the method for the system of its tone degree, it is simple in structure, easy to operate, accuracy is high, compensate for engine noise testing field
Blank.
The content of the invention
The object of the present invention is to provide a kind of system and methods for extracting engine noise tone degree, solve conventional apparatus
And many deficiencies of method in practical applications, it is simple in structure, measuring accuracy is high, easy to operate.
The technical proposal of the invention is realized in this way：A kind of system for extracting engine noise tone degree, including being used for
Measure position sound pressure signal microphone, for fix and adjust microphone position stent, for conversion signal mould/
Number change-over panel carries out computing for the gain amplifier to signal progress noise filtering and amplification and to gathering the voice signal come
The computer of processing.
Further：The microphone mounting structure includes tripod, the vertical telescopic bar on tripod, is located at
The horizontal extension bar of vertical telescopic boom end and the rotary joint for clamping microphone.
A kind of method for extracting engine noise tone degree, using aforementioned device, comprises the following steps：
Step 1:By vehicle parking to be measured in the chassis dynamometer rotating hub in semianechoic room, to influence engine noise its
Its main sound source parts carries out suitable acoustic barrier or acoustics amendment；
Step 2：Microphone is mounted on outside enging cabin on microphone arm, and is placed according to point position；
Step 3:Initialize installation is carried out to system, microphone is demarcated；
Step 4:It is tested by operating mode, each microphone acoustic pressure data is recorded by data acquisition device, repeat to record 4 groups of surveys
Try data；
Step 5:The each group of data of each measuring point is compared and analyzed, choose valid data and calculates being averaged for valid data
Value, as the sound pressure signal finally measured；
Step 6：Fourier analysis is carried out to sound pressure signal, frequency spectrum is drawn, and then the frequency of tonal content is drawn by the frequency spectrum
Bandwidth △z, the centre frequency of tonal contentfWith the sound pressure level size △ of tonal contentL；Its tone spy is calculated according to equation below
Levy function：
；
In formula,w 1For bandwidth feature function,w 2 Centered on frequecy characteristic function,w 3 For sound pressure level characteristic function；
△zFor the frequency bandwidth of tonal content,fFor the centre frequency of tonal content, △LFor the sound pressure level size of tonal content；
Then, tone weighting function is calculated according to equation below：
；
Finally, row index of going forward side by side to the weighting function of all tonal contents is averaged, so that it may show that tonal content is shared in noise
Ratio.
Further：Other main sound source parts that possibility described in step 1 influences engine noise include air inlet
Nozzle, air intake assembly and exhaust pipe mouth；
The suitable acoustic barrier of carry out or acoustics are modified to：Before test, intake muffler is installed in air inlet mouth of pipe, and is disappeared
Sound device is apart from any 2 meters of measuring microphone or more；Sound absorption and insulation material is tied up in vehicle intake component outsourcing；In exhaust pipe mouth, installation
Exhaust silencer.
Further：In steps of 5, each group of data of each measuring point is compared and analyzed, chooses coherence and be higher than 85%
Data are as valid data.
Beneficial effects of the present invention：The system and method for present invention extraction engine noise tone degree, can directly, fast
Acquisition engine noise tone degree, test result precision is high, without being destroyed to vehicle.Due to being according to actual condition
It is tested, as a result more objectivity, is particularly suitable for the accumulation in competing product model data storehouse；Microphone arm can be according to difference
The engine free of vehicle is put.Present system is easily achieved, simple operation, and measuring accuracy is high, has extensive be applicable in
Property, fill up the blank of engine noise testing field.Further screening makees data by degree of coherence and peak difference, can make
As a result more accurate, the index of evaluation is closer to real human body.
Description of the drawings
Fig. 1 is the system structure diagram of present invention extraction engine noise tone degree；
Fig. 2 is that the microphone in the present invention arranges front view；
Fig. 3 is the microphone arm in the present invention；
Fig. 4 is the method flow diagram of present invention extraction engine noise tone degree；
Fig. 5 is inventive engine noise tone degree test result example.
Specific embodiment
1~Fig. 5 is described further embodiments of the present invention below in conjunction with the accompanying drawings.
Embodiment 1：
In the present embodiment extraction engine noise tone degree system, as shown in Figure 1, including computer 1, gain amplifier 2,
3,3 microphones 4 of analog/digital conversion plate.Vehicle parking to be measured is in chassis dynamometer rotating hub, microphone 4 is positioned in anechoic room
On stent.Horizontal distance of 3 microphones 4 apart from engine outer surface is 1 meter.As shown in Fig. 2, enging cabin front end is transaudient
Distance of the device 4 apart from ground is 2 times of engine terrain clearance；Microphone 4 position in cabin both sides is and engine center
It is wired on the extended line of 45° angle.The signal input part of the signal output part connection analog/digital conversion plate 3 of microphone 4；Analog turns
Change the input terminal of the output terminal connection gain amplifier 2 of plate 3；The input terminal of the output terminal connection computer 1 of gain amplifier 2.
Computer 1 in the present embodiment carries out calculation process to gathering the voice signal come, and exports tone degree and calculate knot
Fruit；
Gain amplifier 2 in the present embodiment is used to carry out noise filtering and amplification to signal, and Texas Instrument can be selected（Texas
Instruments）Input operational amplifier TL084 types；
Analog/digital conversion plate 3 in the present embodiment can recognize that for the analog voltage signal of microphone generation is converted to computer 1
Digital signal；American National instrument can be selected（National Instruments）9234 types of data collecting system NI, tool
The passage for having 3 performance parameters completely the same, and two passages keep synchronous acquisition at work.
Microphone 4 in the present embodiment, for measuring the sound pressure signal of position and being converted into voltage signal；This
Microphone 4 in embodiment is fixed using stent.As shown in figure 3, microphone mounting structure includes tripod 5, vertical telescopic bar
6th, horizontal extension bar 7 and rotary joint 8；It is bolted between each component.
Embodiment 2：
Difference lies in particularly send out vehicle to the system of extraction engine noise tone degree in the present embodiment with embodiment 1
The related components of dynamic area of aircraft cabins are handled, on that may influence other main sound of power assembly radiated noise test result
Source parts carry out suitable acoustic barrier or acoustics amendment.Air inlet mouth of pipe is nearer apart from engine, the influence to test result
It is larger, therefore additional intake muffler can be installed to shield air inlet mouth of pipe noise.Exhaust pipe mouth noise apart from power assembly farther out,
It is relatively small on test result influence, if desired, additional exhaust silencer can be installed and/or increase acoustical barriers under vehicle,
Shield exhaust system radiated noise.
Embodiment 3：
Difference lies in test environment if deposit with embodiment 1 for the system of extraction engine noise tone degree in the present embodiment
In high-speed flow, microphone front end should eliminate test error using hurricane globe.
Embodiment 4：
Difference lies in ensure test result with embodiment 1 for the system of extraction engine noise tone degree in the present embodiment
Precision and uniformity, temperature, humidity, the atmospheric pressure level of test environment should keep stable, around without electromagnetic interference and the back of the body
Scape noise should be less than 36 decibels.
Embodiment 5：
The method of extraction engine noise tone degree in the present embodiment, using the device of such as embodiment 1, flow such as Fig. 4 institutes
Show, comprise the following steps：
Step 1:By vehicle parking to be measured in the chassis dynamometer rotating hub in semianechoic room, to influence engine noise its
Its main sound source parts carries out suitable acoustic barrier or acoustics amendment；
Step 2：Microphone is mounted on outside enging cabin on microphone arm, and according to point position as described in example 1 above
It places；
Step 3:Initialize installation is carried out to system, in order to describe conveniently, microphone is demarcated；
Step 4:It is tested by the required working condition tested, each microphone acoustic pressure is recorded by data acquisition device
Data repeat to record 4 groups of test datas；The data acquisition device be embodiment 1 in include computer, gain amplifier,
Data acquisition device including analog/digital conversion plate and microphone；
Step 5:The each group of data of each measuring point is compared and analyzed, is compared by degree of coherence, removal coherence is less than 85%
Data choose remaining valid data and calculate the average value of valid data, as the sound pressure signal finally measured；
Step 6：Fourier transform is carried out to sound pressure signal, corresponding frequency spectrum is drawn, and then tonal content is drawn by the frequency spectrum
Frequency bandwidth △ z, the centre frequency f of tonal content and the sound pressure level size △ L of tonal content；Its sound is calculated according to equation below
Adjust characteristic function：
；
In formula,w 1For bandwidth feature function,w 2 Centered on frequecy characteristic function,w 3 For sound pressure level characteristic function；
△zFor the frequency bandwidth of tonal content,fFor the centre frequency of tonal content, △LFor the sound pressure level size of tonal content；
Then, tone weighting function is calculated according to equation below：
；
Finally, row index of going forward side by side to the weighting function of all tonal contents is averaged, so that it may show that tonal content is shared in noise
Ratio, that is, tone degree.
Preferably：In step 6, on the frequency spectrum of sound pressure signal, if before and after corresponding peak value is more than under a certain frequency
All more than peak value 6dB within 10Hz, then the corresponding ingredient of the peak value be denoted as tonal content and calculated, with this peak difference
Data are made with further screening, result can be made more accurate, the index of evaluation is closer to real human body.
The above description is merely a specific embodiment, but protection scope of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in change or replacement, should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (5)
1. a kind of system for extracting engine noise tone degree, it is characterised in that：Including being used to measure position sound pressure signal
Microphone, for fix and adjust microphone position stent, for the analog/digital conversion plate of conversion signal, for signal
It carries out the gain amplifier of noise filtering and amplification and the computer of calculation process is carried out to gathering the voice signal come.
2. the system of extraction engine noise tone degree as described in claim 1, it is characterised in that：The microphone arm
Structure include tripod, the vertical telescopic bar on tripod, positioned at vertical telescopic boom end horizontal extension bar and be used for
Clamp the rotary joint of microphone.
3. a kind of method for extracting engine noise tone degree, using device as described in claim 1, it is characterised in that：Bag
Include following steps：
Step 1:By vehicle parking to be measured in the chassis dynamometer rotating hub in semianechoic room, to influence engine noise its
Its main sound source parts carries out suitable acoustic barrier or acoustics amendment；
Step 2：Microphone is mounted on outside enging cabin on microphone arm, and is placed according to point position；
Step 3:Initialize installation is carried out to system, microphone is demarcated；
Step 4:It is tested by operating mode, each microphone acoustic pressure data is recorded by data acquisition device, repeat to record 4 groups of surveys
Try data；
Step 5:The each group of data of each measuring point is compared and analyzed, choose valid data and calculates being averaged for valid data
Value, as the sound pressure signal finally measured；
Step 6：Fourier analysis is carried out to sound pressure signal, frequency spectrum is drawn, and then the frequency of tonal content is drawn by the frequency spectrum
Bandwidth △z, the centre frequency of tonal contentfWith the sound pressure level size △ of tonal contentL；Its tone spy is calculated according to equation below
Levy function：
1.jpg；
In formula,w 1For bandwidth feature function,w 2 Centered on frequecy characteristic function,w 3 For sound pressure level characteristic function；
△zFor the frequency bandwidth of tonal content,fFor the centre frequency of tonal content, △LFor the sound pressure level size of tonal content；
Then, tone weighting function is calculated according to equation below：
2.jpg；
Finally, row index of going forward side by side to the weighting function of all tonal contents is averaged, so that it may show that tonal content is shared in noise
Ratio.
4. the method for extraction engine noise tone degree as claimed in claim 3, it is characterised in that：Described in step 1 can
Can influence other main sound source parts of engine noise includes air inlet mouth of pipe, air intake assembly and exhaust pipe mouth；
The suitable acoustic barrier of carry out or acoustics are modified to：Before test, intake muffler is installed in air inlet mouth of pipe, and is disappeared
Sound device is apart from any 2 meters of measuring microphone or more；Sound absorption and insulation material is tied up in vehicle intake component outsourcing；In exhaust pipe mouth, installation
Exhaust silencer.
5. the method for extraction engine noise tone degree as claimed in claim 3, it is characterised in that：In steps of 5, to each survey
The each group of data of point compares and analyzes, and chooses data of the coherence higher than 85% as valid data.
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| CN201611062356.3A CN108122560A (en) | 2016-11-28 | 2016-11-28 | A kind of system and method for extracting engine noise tone degree |
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| CN201611062356.3A CN108122560A (en) | 2016-11-28 | 2016-11-28 | A kind of system and method for extracting engine noise tone degree |
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Cited By (5)
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| CN109324120A (en) * | 2018-11-30 | 2019-02-12 | 重庆长安汽车股份有限公司 | A kind of speed changer sound transmission loss test method and test macro |
| CN113071408A (en) * | 2020-01-06 | 2021-07-06 | 广州汽车集团股份有限公司 | Method and device for processing sounding characteristics of warning sound of pedestrian outside vehicle and vehicle |
| CN114136435A (en) * | 2021-11-18 | 2022-03-04 | 大连交通大学 | Wireless portable expanded type railway vehicle structure noise measurement system and method |
| CN114893260A (en) * | 2022-04-13 | 2022-08-12 | 东风汽车股份有限公司 | Structure for simply eliminating noise of supercharger and test method thereof |
| CN117949215A (en) * | 2024-03-27 | 2024-04-30 | 潍柴动力股份有限公司 | Engine squeal fault determining method and device, vehicle and storage medium |
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| CN113071408A (en) * | 2020-01-06 | 2021-07-06 | 广州汽车集团股份有限公司 | Method and device for processing sounding characteristics of warning sound of pedestrian outside vehicle and vehicle |
| CN113071408B (en) * | 2020-01-06 | 2023-10-24 | 广州汽车集团股份有限公司 | Method and device for processing sounding characteristics of warning sound of vehicle exterior pedestrian and vehicle |
| CN114136435A (en) * | 2021-11-18 | 2022-03-04 | 大连交通大学 | Wireless portable expanded type railway vehicle structure noise measurement system and method |
| CN114893260A (en) * | 2022-04-13 | 2022-08-12 | 东风汽车股份有限公司 | Structure for simply eliminating noise of supercharger and test method thereof |
| CN117949215A (en) * | 2024-03-27 | 2024-04-30 | 潍柴动力股份有限公司 | Engine squeal fault determining method and device, vehicle and storage medium |
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