CN110186556A - A kind of New energy automobile motor bench test noise rating method - Google Patents
A kind of New energy automobile motor bench test noise rating method Download PDFInfo
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- CN110186556A CN110186556A CN201910484351.7A CN201910484351A CN110186556A CN 110186556 A CN110186556 A CN 110186556A CN 201910484351 A CN201910484351 A CN 201910484351A CN 110186556 A CN110186556 A CN 110186556A
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- 238000011156 evaluation Methods 0.000 description 6
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- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
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Abstract
The present invention provides a kind of noise rating method based on noise order sound pressure level gradient parameter, detailed process are as follows: accelerated test is carried out using motor bench, during calculating motor bench accelerated test, and the sound pressure level of each order motor；Based on the sound pressure level of each order motor, each order motor acoustic pressure gradient is calculated, noise rating is carried out to motor according to the acoustic pressure gradient.The method of the present invention evaluates noise of motor using each order motor acoustic pressure gradient, can correctly evaluate New energy automobile motor bench test suddenly accelerate and anxious decelerating mode under noise, have quickly, simple, convenient and correct effect.
Description
Technical field
The invention belongs to technical field of new energy, and in particular to a kind of New energy automobile motor bench test noise is commented
Valence method.
Background technique
New energy automobile motor manufacturer and entire new energy automobile manufacturer testing crew are in motor stand test
When with vehicle NVH road test, the discovery noise sound of motor and loudness value of series under certain operating condition revolving speeds be not high, but tries
The personnel of testing have found that noise subjective sensation of these motors in suddenly acceleration and anxious moderating process is poor, trace it to its cause and essentially consist in
Motor producer and automobile production manufacturer do not use suitable noise rating method.
Summary of the invention
In view of this, the purpose of the invention is to overcome the defect of prior art, for accurate evaluation electric car electricity
Machine suddenly accelerate and anxious decelerating mode under noise evaluation problem, propose a kind of based on noise order sound pressure level gradient parameter
Noise rating method.
The method of the present invention is achieved through the following technical solutions:
A kind of noise rating method based on noise order sound pressure level gradient parameter, detailed process are as follows:
Accelerated test is carried out using motor bench, each order motor acoustic pressure gradient is calculated, according to the acoustic pressure gradient to electricity
Machine carries out noise rating；
It is described to calculate each order motor acoustic pressure gradient specifically:
Firstly, during calculating motor bench accelerated test, the sound pressure level of each order motor；
Secondly, the sound pressure level based on each order motor, calculates each order motor sound pressure level gradient Si；
Wherein, SiFor the motor sound pressure level gradient of the i-th order, i is noise of motor order, LitIt is the i-th order of motor
Sound pressure level, LimFor motor the i-th order sound pressure level maximum value, LijFor the sound pressure level of j-th of frequency band of the i-th order of motor, n is electricity
The revolving speed of machine, α are bandwidth factor.
Further, the present invention carries out noise rating to motor according to the acoustic pressure gradient specifically: judges whether there is
Sound pressure level gradient SiMore than preset critical value, and if it exists, the result evaluated at this time is that noise of motor is unsatisfactory for requiring.
Beneficial effect
The method of the present invention is compared prior art, is evaluated using each order motor acoustic pressure gradient noise of motor, can
Correct evaluation New energy automobile motor bench test suddenly accelerate and anxious decelerating mode under noise, have quickly, it is simple, convenient and
Correct effect.
Detailed description of the invention
Fig. 1 is noise of motor order figure when motor of the embodiment of the present invention accelerates to 9990r/min from 3500r/min；
Fig. 2 is each order gradient of noise of motor when motor of the embodiment of the present invention accelerates to 9990r/min from 3500r/min
Curve.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described.
The embodiment of the present invention provides a kind of noise rating method based on noise order sound pressure level gradient parameter, substantially real
It is as follows to apply process:
Firstly, during calculating motor bench accelerated test, the sound pressure level of each order motor, as shown in Figure 1, wherein horizontal seat
It is designated as motor speed, ordinate is noise sound.
It is risen or fallen since sound pressure level curve shown in FIG. 1 cannot effectively reflect motor speed (especially anxious to accelerate
In anxious moderating process) when noise situation of change, need to find new parameter to evaluate noise of motor.
According to mathematically to the definition of gradient: the gradient in scalar field on certain point is directed toward the fastest-rising side of scalar field
To the length of gradient is this maximum change rate.In the case where single argument real-valued function, gradient is derivative.If motor
The noise sound in somewhere is L in sound field, and the parameter is L+dL at motor speed change dn, then is known as the ladder of the sound pressure level
Degree namely the sound pressure level with revolving speed change rate.
Therefore, the embodiment of the present invention proposes to evaluate noise of motor variation using sound pressure level gradient.
Secondly, for the motor sound pressure level gradient objective data and people's evaluation result one that obtain noise transducer measurement
It causes, needs to comprehensively utilize motor sound pressure level gradient parameter.The embodiment of the present invention propose using motor sound pressure level maximum value gradient and
The weighted value curve of each sound control gradient simulates the impression (evaluation) that people changes noise of motor, each order i motor
Sound pressure level gradient SiCalculation formula is as follows:
Wherein, i is noise of motor order, LitIt is the sound pressure level of the i-th order of motor, LimFor motor the i-th order sound pressure level
Maximum value, LijFor the sound pressure level of j-th of frequency band of the i-th order of motor, n is the revolving speed of motor, α be bandwidth weighting coefficient (for
Third-octave, α=0.15), N is third-octave band number.
As a certain order i sound pressure level gradient SiWhen variation is more than a certain critical value, illustrate that noise of motor howling becomes non-
Chang Yanchong, therefore can judge whether noise of motor meets the requirements by given threshold.
Fig. 2 is the noise of motor when motor being calculated according to formula (1) accelerates to 9990r/min from 3500r/min
The order gradient curve of 2nd, the 3rd, the 4th and the 16th.From Figure 2 it can be seen that when motor speed suddenly accelerated to from 4100rpm 4450rpm, with
And when from 9100rpm suddenly accelerating to 9450rpm, the sound pressure level gradient factor S of the 16th order, the 2nd order and the 4th order16、S2With
S4It has been above 0.4, has illustrated that this revolving speed section noise of motor becomes abnormal obvious, this evaluation result and live noise of motor examination
The subjective assessment of testing crew is consistent when testing, therefore can accurately be commented noise of motor using the method for the embodiment of the present invention
Valence, and the result evaluated is consistent with the subjective assessment of testing crew, suitable for instructing the design of motor.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (2)
1. a kind of noise rating method based on noise order sound pressure level gradient parameter, which is characterized in that detailed process are as follows:
Using motor bench carry out accelerated test, calculate each order motor acoustic pressure gradient, according to the acoustic pressure gradient to motor into
Row noise rating；
It is described to calculate each order motor acoustic pressure gradient specifically:
Firstly, during calculating motor bench accelerated test, the sound pressure level of each order motor；
Secondly, the sound pressure level based on each order motor, calculates each order motor sound pressure level gradient Si；
Wherein, SiFor the motor sound pressure level gradient of the i-th order, i is noise of motor order, LitIt is the acoustic pressure of the i-th order of motor
Grade, LimFor motor the i-th order sound pressure level maximum value, LijFor the sound pressure level of j-th of frequency band of the i-th order of motor, n is motor
Revolving speed, α are bandwidth factor.
2. the noise rating method according to claim 1 based on noise order sound pressure level gradient parameter, which is characterized in that root
Noise rating is carried out to motor according to the acoustic pressure gradient specifically: judge whether there is sound pressure level gradient SiIt is critical more than preset
Value, and if it exists, the result evaluated at this time is that noise of motor is unsatisfactory for requiring.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578704A (en) * | 2019-09-10 | 2019-12-17 | 湖南猎豹汽车股份有限公司 | Method for adjusting gear corresponding rotating speed of air blower of automobile air conditioner |
| CN112857834A (en) * | 2021-02-25 | 2021-05-28 | 浙江航驱汽车科技有限公司 | Method for evaluating running noise of double-pinion type electric power steering gear |
| CN114485918A (en) * | 2022-01-22 | 2022-05-13 | 重庆长安汽车股份有限公司 | Method for evaluating noise of vehicle generator |
| CN115273894A (en) * | 2022-06-15 | 2022-11-01 | 中国第一汽车股份有限公司 | Automobile electrical appliance sound evaluation method based on music principle |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578704A (en) * | 2019-09-10 | 2019-12-17 | 湖南猎豹汽车股份有限公司 | Method for adjusting gear corresponding rotating speed of air blower of automobile air conditioner |
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| CN112857834A (en) * | 2021-02-25 | 2021-05-28 | 浙江航驱汽车科技有限公司 | Method for evaluating running noise of double-pinion type electric power steering gear |
| CN114485918A (en) * | 2022-01-22 | 2022-05-13 | 重庆长安汽车股份有限公司 | Method for evaluating noise of vehicle generator |
| CN115273894A (en) * | 2022-06-15 | 2022-11-01 | 中国第一汽车股份有限公司 | Automobile electrical appliance sound evaluation method based on music principle |
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