CN115077690A - Method for evaluating periodic pulsation noise of internal combustion engine - Google Patents
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Abstract
The invention discloses a method for evaluating periodic pulsation noise of an internal combustion engine, which comprises the following steps: step 1, collecting a noise signal and a rotating speed signal; step 2, carrying out segmented filtering on the noise signal; step 3, performing Hilbert transform on the multi-section filtering signals; step 4, Fourier transform is carried out on each section of signal; step 5, calculating the modulation depth of each frequency band signal; step 6: calculating the modulation depth of each order; and 7, calculating the periodic pulse index. The invention can accurately identify the periodic pulsating noise based on the auditory sensation of human ears and the nature of the periodic pulsating noise. By the evaluation method, the severity of the periodic pulsating noise can be judged, and the main contribution frequency of the pulsating noise can be judged.
Description
Technical Field
The invention belongs to the technical field of NVH analysis and evaluation of engines, and particularly relates to a method for evaluating periodic pulsating noise of an internal combustion engine.
Background
For the reciprocating internal combustion engine, sounds like valve sound, oil injection sound and the like which are periodically fluctuated along with the rotating speed of the engine always exist objectively, and the characteristics of the periodic fluctuation can be sensitively felt, so that attention and complaints are attracted; the characteristics of the pulsating sound cannot be effectively identified only by adopting the index of the sound pressure level for evaluation, and complaints are still caused by the existence of the pulsating sound under the condition that the sound pressure level meets the requirements in the process of project development. The uncontrollable performance is measured by subjective evaluation, and the evaluated results of the same sound are different due to different auditory characteristics and subjective preferences of different people.
Patent document CN201910035860.1 discloses an objective evaluation method for diesel engine impulse noise, which first calculates the time-varying specific loudness of sound signals within 24 critical frequency bands, and then calculates the line-to-pulse amplitude of compressed signals within 24 frequency bands and the absolute amplitude of uncompressed signals, and obtains an objective impulse noise evaluation index by integration. However, the general idea of this method is still from the perspective of the magnitude of the sound, and the root cause of the periodic impulse of the signal is not considered, and for the noise with a low magnitude contribution and a large periodic impulse contribution, it is difficult to accurately identify the magnitude of the impulse contribution, and meanwhile, the noise is greatly influenced by the background noise with a frequency close to that of the impulse signal, which has a great limitation.
Therefore, it is necessary to develop a new method for evaluating the periodic pulsation noise of the internal combustion engine.
Disclosure of Invention
The invention aims to provide an evaluation method of periodic pulsating noise of an internal combustion engine, which can accurately identify the periodic pulsating noise based on the auditory perception of human ears and the nature of the periodic pulsating noise; the severity of the periodic ripple noise can be determined, and the main contribution frequency of the ripple noise can be determined.
The invention discloses a method for evaluating periodic pulsation noise of an internal combustion engine, which comprises the following steps of:
And 3, performing Hilbert transform on the multi-segment filtering signals: the 24 time domain signals S 1 、S 2 。......S 24 Hilbert transform is performed to obtain the envelope time domain signals of each signal, which are respectively T 1 、T 2 。......T 24 ；
And 4, Fourier transform is carried out on each section of signals: each envelope a time domain signal T 1 、T 2 。......T 24 Fourier transform is carried out to obtain frequency domain signals of each envelope signal, which are Y respectively 1 、Y 2 。......Y 24 ；
And 6: calculating the modulation depth of each order, specifically:
step 6a, with X 1 、X 2 。......X 24 Combining the frequency information of the step 2 to obtain critical-band-F m --M d A three-dimensional spectrogram;
step 6b, calculating the crankshaft rotation speed time domain signal RPM in the step 1 according to a formula RPM/60 to obtain the frequency corresponding to the 1-order of the engine under the rotation speed, namely f orde1 ＝RPM/60*1，f orde0.5 ＝RPM/60*0.5，f orde1.5 ＝RPM/60*1.5，f orde2 ＝RPM/60*2；
Step 6c, the critical-band- -F in step 6a m --M d In the three-dimensional spectrogram, let F m Is f orde0.5 Will be at f orde0.5 All M at modulation frequency d The modulation depths are superposed to obtain M order0.5 In the same way, M can be obtained order1 ，M order1.5 ，M order2 ；
And 7, calculating a periodic pulse index: according to the formula
And obtaining an evaluation index for evaluating the periodic pulsating noise, wherein i is order1, order1.5 and order 2.
Optionally, in the step 1, continuous time domain signals of the noise signal S and the crankshaft speed signal RPM under the stable speed operation condition of the internal combustion engine are collected in a time tracking manner.
Optionally, in step 2, the filtering frequency of the band-pass filter is sequentially set according to a frequency band range of 1-24 barg defined by critical-band, wherein, the time-domain signal S is 1 Containing frequency-domain information, time-domain signals S, only within 1-barg band 2 Containing frequency-domain information, time-domain signals S, only within 2-bar bands 3 Containing only frequency domain information within 3 barg bands, … …, time domain signal S 24 Only frequency domain information within 24 barg bands is included.
The invention has the following advantages:
the invention firstly carries out the frequency band division of the model according to the criterion-band, fully considers the physiological and psychological influence of people on the aspect of sound hearing, and on the other hand, from the modulation angle of the signal, the invention is closer to the periodic characteristic of the periodic pulse signal, and carries out quantitative analysis and evaluation on the noise more intuitively and objectively.
The method provided by the invention is simple to operate and strong in practicability, can greatly reduce the labor and time cost for organizing subjective evaluation and achieving unified opinions, can effectively unify the subjective and objective evaluation, and makes the evaluation standard of periodic pulsating noise according to the method, thereby providing a basis for NVH design and optimal control of the internal combustion engine.
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Fig. 1 is a schematic calculation flowchart of the present embodiment.
Fig. 2 is a schematic diagram of a steady-state noise continuous time domain signal of the internal combustion engine in the embodiment.
FIG. 3 is a schematic diagram of a crankshaft speed signal of the internal combustion engine according to the present embodiment.
FIG. 4 is a schematic diagram of the noise segmented filter decomposition of the internal combustion engine according to the present embodiment.
Fig. 5 is a schematic diagram of the segmented noise after hilbert transform.
Fig. 6 is a schematic diagram of the completion of fourier transform of noise after hilbert transform in this embodiment.
Fig. 7 is a schematic diagram of signal amplitude conversion to modulation depth in this embodiment.
FIG. 8 is a three-dimensional spectrum diagram of critical-band- -Fm- -Md in the present embodiment.
FIG. 9 is a schematic diagram of the calculation ranges of modulation depths of 0.5, 1, 1.5, and 2 orders in this embodiment
Fig. 10 is a schematic diagram of modulation depths of 0.5, 1, 1.5, and 2 orders after superposition in this embodiment.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, in the present embodiment, a method for evaluating periodic pulsation noise of an internal combustion engine includes the steps of:
And 2, performing time-domain filtering processing on the noise signal S by adopting a band-pass filter, wherein the filtering frequency of the band-pass filter is sequentially set according to the frequency band range of 1-24 barg specified by critical-band. The noise time domain signal S is decomposed into 24 time domains containing different frequency information by a filterDomain signals, respectively S 1 、S 2 。......S 24 (ii) a As shown in fig. 4.
And 3, performing Hilbert transform on the multi-segment filtering signals: decomposing S in the step 2 1 、S 2 。......S 24 The total 24 time domain signals are subjected to Hilbert transform to obtain S 1 、S 2 。......S 24 The envelope time domain signal of each signal is T in turn 1 、T 2 。......T 24 As shown in fig. 5.
And 4, step 4: fourier transform is carried out on each signal: step 3, T 1 、T 2 。......T 24 Performing discrete Fourier transform on 24 envelope time domain signals to obtain frequency domain signal Y of the envelope signal 1 、Y 2 。......Y 24 The calculated Y 1 、Y 2 。......Y 24 The abscissa of the signal corresponds to S 1 、S 2 。......S 24 Modulation frequency F of each signal m The ordinate is the corresponding amplitude A at the respective frequency m Wherein, the corresponding amplitude is A when the modulation frequency is 0 C As shown in fig. 6.
step 6a, with X 1 、X 2 。......X 24 Combining the frequency information of 1-24bark critical-band in the step 2 to obtain the critical-band-F m --M d A three-dimensional spectral plot, as shown in fig. 8.
Step 6b: calculating the crankshaft rotation speed time domain signal RPM in the step 1 according to a formula RPM/60 to obtain the frequency f corresponding to the 1-order engine of the engine at the rotation speed orde1 ＝RPM/60*1，f orde0.5 ＝RPM/60*0.5，f orde1.5 ＝RPM/60*1.5，f orde2 ＝RPM/60*2。
As shown in FIG. 1, the crankshaft speed RPM is 717, and the frequency corresponding to 1-step engine speed at the crankshaft speed RPM is obtained according to the formula RPM/60, namely f orde1 RPM/60 × 1 to 11.95Hz, frequency f corresponding to 0.5 steps orde0.5 RPM/60 × 0.5 × 5.975Hz, corresponding to a frequency f of order1.5 orde1.5 RPM/60 × 1.5 × 17.925Hz, frequency f corresponding to 2 steps orde2 ＝RPM/60*2＝23.9Hz。
Step 6c, the critical-band- -F in step 6a m --M d In the three-dimensional spectrogram, let F m Is f orde0.5 Will be at f orde0.5 All M at modulation frequency d The modulation depths are superposed to obtain M order0.5， In the same way, M can be obtained order1 ，M order1.5 ，M order2 ；
And 7, calculating a periodic pulse index: according to the formula
And obtaining an evaluation index for evaluating the periodic pulsating noise, wherein i is order1, order1.5 and order 2.
In the data shown in FIG. 7, let F m Is sequentially f orde0.5 ＝5.975Hz，f orde1 ＝11.95Hz，f orde1.5 ＝17.925Hz，f orde2 23.9Hz will be all M at the corresponding modulation frequency d The modulation depths are superimposed, and the regions are marked as shown in FIG. 9, to obtain M order0.5 ，M order1 ，M order1.5 ，M order2 As shown in FIG. 10, M order0.5 ＝9.1，M order1 ＝2.6，M order1.5 ＝2.4，M order2 1.4; finally according to the formula
Obtaining a noise periodThe sexual pulsation index was 9.86.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (3)
1. A method for evaluating periodic pulsation noise of an internal combustion engine, characterized by: the method comprises the following steps:
step 1, collecting noise signals and rotating speed signals: collecting a noise signal S and a continuous time domain signal of a crankshaft rotating speed signal RPM under the working condition of stable rotating speed operation of the internal combustion engine;
step 2, carrying out segmented filtering on the noise signal: performing time domain filtering processing on the continuous noise time domain signal acquired in the step 1 by adopting a band-pass filter, and decomposing the continuous noise time domain signal into 24 time domain signals containing different frequency information, namely S 1 、S 2 。......S 24 ；
And 3, performing Hilbert transform on the multi-segment filtering signals: the 24 time domain signals S 1 、S 2 。......S 24 Hilbert transform is performed to obtain the envelope time domain signals of each signal, which are respectively T 1 、T 2 。......T 24 ；
And 4, Fourier transform is carried out on each section of signals: each envelope a time domain signal T 1 、T 2 。......T 24 Fourier transform is carried out to obtain frequency domain signals of each envelope signal, which are Y respectively 1 、Y 2 。......Y 24 ；
Step 5, calculating the modulation depth of each frequency band signal: the frequency domain signal Y of each envelope signal 1 、Y 2 。......Y 24 Amplitude A at each modulation frequency m Divided by the amplitude A corresponding to a modulation frequency of 0 C Obtaining the modulation depth M corresponding to the modulation frequency one by one d (ii) a At a modulation frequency F m As abscissa, by modulation of depth M d As ordinate, i.e. each envelope signalFrequency domain signal Y 1 、Y 2 。......Y 24 Conversion into a new signal X 1 、X 2 。......X 24 ；
Step 6: calculating the modulation depth of each order, specifically:
step 6a, with X 1 、X 2 。......X 24 Combining the frequency information of the step 2 to obtain critical-band-F m --M d A three-dimensional spectrogram;
step 6b, calculating the crankshaft rotation speed time domain signal RPM in the step 1 according to a formula RPM/60 to obtain the frequency corresponding to the 1-order of the engine under the rotation speed, namely f orde1 ＝RPM/60*1，f orde0.5 ＝RPM/60*0.5，f orde1.5 ＝RPM/60*1.5，f orde2 ＝RPM/60*2；
Step 6c, the critical-band- -F in step 6a m --M d In the three-dimensional spectrogram, let F m Is f orde0.5 Will be at f orde0.5 All M at modulation frequency d The modulation depths are superposed to obtain M order0.5 In the same way, M can be obtained order1 ，M order1.5 ，M order2 ；
And 7, calculating a periodic pulse index: according to the formula
And obtaining an evaluation index for evaluating the periodic pulsating noise, wherein i is order1, order1.5 and order 2.
2. The method of evaluating periodic pulsation noise of an internal combustion engine according to claim 1, wherein: in the step 1, continuous time domain signals of a noise signal S and a crankshaft rotating speed signal RPM under the working condition of stable rotating speed operation of the internal combustion engine are collected in a time tracking mode.
3. The evaluation method of periodic pulsation noise of an internal combustion engine according to claim 1 or 2, characterized in that: in the step 2, the filtering frequency of the band-pass filter is 1-24bark specified by critical-bandA frequency band range is set, wherein, the time domain signal S 1 Containing frequency-domain information, time-domain signals S, only within 1-barg band 2 Containing frequency-domain information, time-domain signals S, only within 2-bar bands 3 Containing only frequency domain information within 3 barg bands, … …, time domain signal S 24 Containing only frequency domain information within the 24-barg band.
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Cited By (2)
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| CN117990378A (en) * | 2024-04-07 | 2024-05-07 | 潍柴动力股份有限公司 | Engine sound quality evaluation method and device, electronic equipment and storage medium |
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