CN113884312A - TPA analysis model-based in-vehicle rumbling troubleshooting method - Google Patents
TPA analysis model-based in-vehicle rumbling troubleshooting method Download PDFInfo
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- 230000005540 biological transmission Effects 0.000 claims abstract description 26
- 238000005096 rolling process Methods 0.000 claims abstract description 9
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- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
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Abstract
The invention provides a method for checking the rolling of the interior of a vehicle based on a TPA analysis model, which comprises the following steps: whether a working condition with high accelerating noise in the vehicle exists is determined through subjective evaluation, if so, noise test is carried out on the problem working condition, and a noise signal in the vehicle is collected; carrying out spectrum analysis on the in-vehicle noise signal to judge whether abnormal spectrum occurs in the in-vehicle noise, and if so, carrying out investigation on an excitation source and a transmission path of the noise by combining test data with subjective evaluation; constructing a TPA analysis model according to the excitation sources and the transmission path, and testing and analyzing the noise signals in the vehicle according to the TPA analysis model to determine the sound pressure in the vehicle, the number of the excitation sources and the specific positions; and carrying out experimental identification on each excitation source and the transmission path through the TPA analysis model so as to determine the contribution amount of the rolling noise in the vehicle. The invention can improve the efficiency and accuracy of the noise test in the automobile and increase the comfort of the automobile.
Description
Technical Field
The invention relates to the technical field of automobile noise detection, in particular to an in-automobile rumbling inspection method based on a TPA analysis model.
Background
With the development of the current automobile market, consumers have higher and higher requirements on various performances of automobiles, and the problem of NVH of automobiles is more and more emphasized, wherein NVH refers to Noise, Vibration and Harshness (sound and Vibration Harshness), and the three occur simultaneously and are inseparable in mechanical Vibration of automobiles and the like, so the three are often put together for research. The quality of NVH becomes an important factor for purchasing automobiles. The problem of the NVH is serious when the vehicle interior is in an acceleration condition and the roaring sound is too large. The roaring sound in the automobile can cause people to feel tinnitus and dizziness, and in severe cases, drivers and passengers feel nausea and chest distress, so that the comfort of the automobile and the safety of driving are greatly influenced. The existing correction of the in-vehicle bombing sound under the acceleration working condition mainly depends on the experience of NVH engineers, and the main parts influencing the acceleration noise are subjected to exclusivity tests, such as the elimination through methods of balancing weight, replacing parts and the like. This approach is not only time consuming and difficult to distinguish between the source and path contributions, but the results of the investigation are often related to the engineer's experience.
Disclosure of Invention
The invention provides an in-vehicle rumbling troubleshooting method based on a TPA analysis model, which solves the problems that the correction of the in-vehicle rumbling sound under the acceleration working condition mainly depends on the experience of engineers and lacks objective analysis basis, can improve the efficiency and the accuracy of in-vehicle noise test, and increases the comfort of an automobile.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for checking rolling sound in a vehicle based on a TPA analysis model comprises the following steps:
whether a working condition with high accelerating noise in the vehicle exists is determined through subjective evaluation, if so, noise test is carried out on the problem working condition, and a noise signal in the vehicle is collected;
carrying out spectrum analysis on the in-vehicle noise signal to judge whether abnormal spectrum occurs in the in-vehicle noise, and if so, carrying out investigation on an excitation source and a transmission path of the noise by combining test data with subjective evaluation;
constructing a TPA analysis model according to the excitation sources and the transmission path, and testing and analyzing the noise signals in the vehicle according to the TPA analysis model to determine the sound pressure in the vehicle, the number of the excitation sources and the specific positions;
and carrying out experimental identification on each excitation source and the transmission path through the TPA analysis model so as to determine the contribution amount of the rolling noise in the vehicle.
Preferably, the TPA analytical model comprises:
the in-vehicle sound pressure calculation formula is as follows:
wherein P is the sound pressure in the vehicle and HiIs the structural transfer function, fiFor working load, HkAs a function of air transfer, QkFor acoustic loading, i is the number of transmission paths, and k is the number of acoustic excitation sources.
Preferably, the TPA analysis model further comprises: measuring the frequency response function between the receiving point and the excitation point, and multiplying the actual excitation input of each excitation point by the corresponding frequency response function to obtain the partial response of each transfer path generated at the receiving point.
Preferably, the TPA analysis model further comprises: a structural transfer model and an air transfer model;
the structure transfer model is used for setting a reference point and an excitation point according to vibration sources in the vehicle so as to determine the structure transfer function of each vibration source;
the air transfer model is used for setting reference points and excitation points according to noise sources in the vehicle so as to determine the air transfer function of each noise source.
Preferably, the vibration source includes: the engine power assembly, the exhaust hanger and the air conditioning system.
Preferably, the noise source includes: the engine, gearbox, intake pipe and blast pipe.
Preferably, the method further comprises the following steps:
comparing the in-vehicle sound pressure calculated by the TPA analysis model with a test result, and if the in-vehicle sound pressure is consistent with the test result, analyzing the correlation between the excitation source and the path transfer function and the noise frequency band so as to sequence the total noise contribution amount;
acquiring a main contribution source, and changing the corresponding excitation source and the corresponding transmission path in the TPA analysis model to test whether the noise peak value in the vehicle is reduced;
and if so, sequencing the contribution quantity of the excitation source and the transmission path which influence the peak value of the in-vehicle noise so as to correct the in-vehicle booming noise.
Preferably, the testing and analyzing the noise signals in the vehicle according to the TPA analysis model includes:
and (3) performing a 3-gear full-accelerator acceleration test on the performance of a test field, testing the noise signal in the vehicle at the engine speed of 1000-5000 rpm, and determining the frequency and order of the noise through spectral analysis and order analysis.
Preferably, the testing and analyzing the noise signal in the vehicle according to the TPA analysis model further includes: testing a path transfer function and testing a working load;
the testing of the path transfer function comprises: placing a medium and low frequency volume acceleration sound source at a target point for excitation, testing acceleration or sound pressure signals of an excitation point in structure transfer and air transfer, and calculating a target point transfer function;
the testing of the workload comprises: and testing acceleration signals or sound pressure signals of the excitation point and the reference point under the operating condition to calculate the working load.
The invention provides an in-vehicle rumbling troubleshooting method based on a TPA analysis model, which is characterized in that the TPA analysis model is constructed through an excitation source and a transmission path in a vehicle to test and analyze an in-vehicle noise signal so as to determine an in-vehicle rumbling noise source. The problem of mainly relying on engineer's experience to the rectification of the interior roaring sound of getting off to the operating mode of accelerating now, lack objective analysis basis is solved, efficiency and the accuracy of noise test in the car can be improved, the travelling comfort of car is increased.
Drawings
In order to more clearly describe the specific embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below.
Fig. 1 is a schematic diagram of a method for checking rolling in a vehicle based on a TPA analysis model.
Fig. 2 is a flowchart of in-vehicle booming troubleshooting according to an embodiment of the present invention.
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
Aiming at the problem that the existing correction of the in-vehicle roaring sound lacks objective analysis basis, the invention provides an in-vehicle roaring investigation method based on a TPA analysis model. The method solves the problems that the correction of the internal booming sound of the automobile under the acceleration working condition mainly depends on the experience of engineers and lacks the objective analysis basis, can improve the efficiency and the accuracy of the noise test in the automobile, and increases the comfort of the automobile.
As shown in fig. 1, a method for checking rolling singing in a vehicle based on a TPA analysis model includes:
s1: whether a working condition with high accelerating noise in the vehicle exists is determined through subjective evaluation, if so, noise test is carried out on the problem working condition, and a noise signal in the vehicle is collected;
s2: carrying out spectrum analysis on the in-vehicle noise signal to judge whether abnormal spectrum occurs in the in-vehicle noise, and if so, carrying out investigation on an excitation source and a transmission path of the noise by combining test data with subjective evaluation;
s3: constructing a TPA analysis model according to the excitation sources and the transmission path, and testing and analyzing the noise signals in the vehicle according to the TPA analysis model to determine the sound pressure in the vehicle, the number of the excitation sources and the specific positions;
s4: and carrying out experimental identification on each excitation source and the transmission path through the TPA analysis model so as to determine the contribution amount of the rolling noise in the vehicle.
Specifically, the method analyzes the booming noise generated in the vehicle by using TPA (Transmission Path Analysis), as shown in fig. 2, by constructing an Analysis model of a noise Transmission Path of a typical working condition of the entire vehicle at a design stage and a real stage, fitting the model at the design stage and the real stage to obtain the noise in the vehicle, analyzing the contribution of each excitation source and Transmission Path of the entire vehicle to the noise in the vehicle, and performing rectification optimization on the main contribution. The method can solve the problems that the correction of the inner boom sound of the automobile under the acceleration working condition mainly depends on the experience of an engineer and lacks the objective analysis basis, reduce the noise elimination time, improve the accuracy of noise analysis and increase the comfort of the automobile.
The TPA analysis model comprises: the in-vehicle sound pressure calculation formula is as follows:
wherein P is the sound pressure in the vehicle and HiIs the structural transfer function, fiFor working load, HkAs a function of air transfer, QkFor acoustic loading, i is the number of transmission paths, and k is the number of acoustic excitation sources.
Further, the TPA analysis model further comprises: measuring the frequency response function between the receiving point and the excitation point, and multiplying the actual excitation input of each excitation point by the corresponding frequency response function to obtain the partial response of each transfer path generated at the receiving point.
Still further, the TPA analysis model further comprises: structural transfer models and air transfer models. The structure transfer model is used for setting reference points and excitation points according to vibration sources in the vehicle so as to determine the structure transfer function of each vibration source. The air transfer model is used for setting reference points and excitation points according to noise sources in the vehicle so as to determine the air transfer function of each noise source.
The vibration source includes: the engine power assembly, the exhaust hanger and the air conditioning system. The noise source includes: the engine, gearbox, intake pipe and blast pipe.
In practical applications, TPA analysis measures the Frequency Response Function (FRF) between the receive point and the excitation point. During the test, the point of application of the excitation source (force or volume velocity) shall include all the possible locations (i.e. all possible paths) where the energy excitation can be generated to obtain the FRF, and the actual excitation input (force or volume velocity) when each excitation point works is multiplied by the respective FRF, i.e. the partial response generated by each path at the receiving point is obtained. In actual operation, the total sound pressure level of the receiving points can be considered as the superposition of the contributions of the individual path responses. Collecting structural acoustic excitation-power assembly suspension vehicle body end excitation force, half shaft hub unit mounting point excitation, air conditioning expansion valve vehicle body end excitation force and exhaust suspension vehicle body end excitation force under an acceleration working condition; collecting air acoustic excitation-power assembly air radiation noise, air radiation noise of an air inlet pipe opening and air radiation noise of an air outlet pipe opening.
In one embodiment, the TPA analysis model is established by determining the number and specific positions of the excitation points and the reference points according to a specific vehicle type, and the excitation points and the reference points of the structure transfer model are shown in table 1.
TABLE 1
TABLE 2
The method further comprises the following steps:
s5: comparing the in-vehicle sound pressure calculated by the TPA analysis model with a test result, and if the in-vehicle sound pressure is consistent with the test result, analyzing the correlation between the excitation source and the path transfer function and the noise frequency band so as to sequence the total noise contribution amount;
s6: acquiring a main contribution source, and changing the corresponding excitation source and the corresponding transmission path in the TPA analysis model to test whether the noise peak value in the vehicle is reduced;
s7: and if so, sequencing the contribution quantity of the excitation source and the transmission path which influence the peak value of the in-vehicle noise so as to correct the in-vehicle booming noise.
Further, the testing and analyzing of the noise signals in the vehicle according to the TPA analysis model comprises: and (3) performing a 3-gear full-accelerator acceleration test on the performance of a test field, testing the noise signal in the vehicle at the engine speed of 1000-5000 rpm, and determining the frequency and order of the noise through spectral analysis and order analysis.
Furthermore, the testing and analyzing the noise signals in the vehicle according to the TPA analysis model further comprises: testing a path transfer function and testing a working load;
the testing of the path transfer function comprises: and placing a medium and low frequency volume acceleration sound source at the target point for excitation, testing acceleration or sound pressure signals of an excitation point in structure transfer and air transfer, and calculating a target point transfer function.
The testing of the workload comprises: and testing acceleration signals or sound pressure signals of the excitation point and the reference point under the operating condition to calculate the working load.
In practical application, the working load can be calculated through analysis software, and the specific steps are that a III-gear full-accelerator acceleration (III-WOT) test is carried out on a test field performance track, the rotating speed of an engine is 1000rpm → 5000rpm, the working condition of a driving right noise signal in a test vehicle is tested, an acceleration signal or a sound pressure signal of an excitation point and a reference point under the test operation condition is tested, and the working load can be calculated in the software according to the data. Meanwhile, an inverse matrix method may be employed to obtain the input excitation, which is based on measuring the structural response of the receiving side caused by all path input force excitations and inverting the measured acceleration matrix.
In one embodiment, when the III-gear full throttle of a certain trolley is accelerated, the driving right noise in the trolley generates about 3dB (A) fluctuation around 3800rpm, the auditory perception of people is influenced, the influence is mainly influenced by 2-order (127 Hz) noise of an engine, and the influence of 4-order and 6-order noise is small. Aiming at the peak noise, the TPA test is used to identify that the four paths with large contribution quantity are as follows in sequence: the engine comprises an engine left suspension (Z direction), an engine rear suspension (Z direction), an engine right surface and an engine upper surface. The large contribution of these four paths is mainly due to the problem of the path transfer function, rather than the load, which provides a clear direction for the rectification. And virtually modifying and predicting the excitation source and the transfer function respectively for the transfer path with higher correlation so as to adjust the sound pressure in the vehicle.
The method for checking the in-vehicle rumbling comprises the steps of constructing a TPA analysis model through an excitation source and a transmission path in the vehicle to test and analyze an in-vehicle noise signal, and further determining an in-vehicle rumbling noise source. The method solves the problems that the correction of the internal booming sound of the automobile under the acceleration working condition mainly depends on the experience of engineers and lacks the objective analysis basis, can improve the efficiency and the accuracy of the noise test in the automobile, and increases the comfort of the automobile.
The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.
Claims (9)
1. A method for checking the rolling sound in a vehicle based on a TPA analysis model is characterized by comprising the following steps:
whether a working condition with high accelerating noise in the vehicle exists is determined through subjective evaluation, if so, noise test is carried out on the problem working condition, and a noise signal in the vehicle is collected;
carrying out spectrum analysis on the in-vehicle noise signal to judge whether abnormal spectrum occurs in the in-vehicle noise, and if so, carrying out investigation on an excitation source and a transmission path of the noise by combining test data with subjective evaluation;
constructing a TPA analysis model according to the excitation sources and the transmission path, and testing and analyzing the noise signals in the vehicle according to the TPA analysis model to determine the sound pressure in the vehicle, the number of the excitation sources and the specific positions;
and carrying out experimental identification on each excitation source and the transmission path through the TPA analysis model so as to determine the contribution amount of the rolling noise in the vehicle.
2. The TPA analysis model-based in-vehicle roar troubleshooting method of claim 1 wherein the TPA analysis model comprises:
the in-vehicle sound pressure calculation formula is as follows:
wherein P is the sound pressure in the vehicle and HiIs the structural transfer function, fiFor working load, HkAs a function of air transfer, QkFor acoustic loading, i is the number of transmission paths, and k is the number of acoustic excitation sources.
3. The TPA analysis model-based in-vehicle roar troubleshooting method of claim 2 wherein the TPA analysis model further comprises: measuring the frequency response function between the receiving point and the excitation point, and multiplying the actual excitation input of each excitation point by the corresponding frequency response function to obtain the partial response of each transfer path generated at the receiving point.
4. The TPA analysis model-based in-vehicle roar troubleshooting method of claim 3 wherein the TPA analysis model further comprises: a structural transfer model and an air transfer model;
the structure transfer model is used for setting a reference point and an excitation point according to vibration sources in the vehicle so as to determine the structure transfer function of each vibration source;
the air transfer model is used for setting reference points and excitation points according to noise sources in the vehicle so as to determine the air transfer function of each noise source.
5. The TPA analysis model-based in-vehicle roar troubleshooting method of claim 4 wherein the vibration source comprises: the engine power assembly, the exhaust hanger and the air conditioning system.
6. The TPA analysis model-based in-vehicle roar troubleshooting method of claim 5 wherein the noise source comprises: the engine, gearbox, intake pipe and blast pipe.
7. The TPA analysis model-based in-vehicle roar troubleshooting method of claim 6 further comprising:
comparing the in-vehicle sound pressure calculated by the TPA analysis model with a test result, and if the in-vehicle sound pressure is consistent with the test result, analyzing the correlation between the excitation source and the path transfer function and the noise frequency band so as to sequence the total noise contribution amount;
acquiring a main contribution source, and changing the corresponding excitation source and the corresponding transmission path in the TPA analysis model to test whether the noise peak value in the vehicle is reduced;
and if so, sequencing the contribution quantity of the excitation source and the transmission path which influence the peak value of the in-vehicle noise so as to correct the in-vehicle booming noise.
8. The TPA analysis model-based in-vehicle roaring investigation method according to claim 7, wherein the testing and analyzing of the in-vehicle noise signal according to the TPA analysis model comprises:
and (3) performing a 3-gear full-accelerator acceleration test on the performance of a test field, testing the noise signal in the vehicle at the engine speed of 1000-5000 rpm, and determining the frequency and order of the noise through spectral analysis and order analysis.
9. The TPA analysis model based in-vehicle roaring investigation method according to claim 8, wherein the testing and analyzing of the in-vehicle noise signal according to the TPA analysis model further comprises: testing a path transfer function and testing a working load;
the testing of the path transfer function comprises: placing a medium and low frequency volume acceleration sound source at a target point for excitation, testing acceleration or sound pressure signals of an excitation point in structure transfer and air transfer, and calculating a target point transfer function;
the testing of the workload comprises: and testing acceleration signals or sound pressure signals of the excitation point and the reference point under the operating condition to calculate the working load.
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Application publication date: 20220104 |