JP2005315595A - Specifying device of abnormal sound generation source and specifying method for abnormal sound generation source - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a specifying device of abnormal sound generation source capable of specifying abnormal sound generation source without variation. <P>SOLUTION: The allophone generation source specifying device 1 for specifying abnormal sound generation source in a shift control mechanism 100 generating abnormal sound comprises a microphone 20 for detecting sound generated from the shift control mechanism 100, vibration sensors 10a to 10k detecting the vibration in a plurality of locations of the shift control mechanism 100, and a computer 30 for comparing each vibration waveform detected with each vibration sensor 10a to 10k with the sound waveform detected with the microphone 20 and specifying the location generating vibration having a waveform closest to the sound waveform in a plurality of vibrations as the abnormal sound generation source in the shift control mechanism 100. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an allophone generation source specifying device and an allophone generation source specifying method for specifying an allophone generation source in a mechanical device that generates an allophone.

  As an abnormal sound source identifying device for identifying an abnormal sound source in a mechanical device that generates abnormal noises, vibration sensors at normal times in the mechanical device are stored in advance, and vibration sensors attached to a plurality of locations in the mechanical device The vibration pattern is detected by comparing the detected vibration pattern with the normal vibration pattern, and when the detected vibration pattern deviates from the normal vibration pattern, it is determined as abnormal vibration and the abnormal sound source is specified. An apparatus is conventionally known (see, for example, Patent Document 1).

  If an abnormal sound source is specified by relying only on abnormal noise in a mechanical device, it is easy to perceive that there is a problem at the location where the abnormal noise is the largest. It is effective to use one parameter for specifying the abnormal sound source.

  However, in the above-described abnormal sound source identification device, the vibration pattern that deviates from the normal pattern is determined to be abnormal based solely on the vibration pattern.For example, when a plurality of abnormal vibrations occur at the same time, etc. The causal relationship between the abnormal noise and the vibration pattern is not clarified, and the source of the abnormal noise cannot be specified accurately.

Therefore, in order to accurately specify the abnormal sound source, it is preferable to specify the abnormal sound source by associating the actually detected abnormal sound with the vibration. It is difficult to automate, and as a result, it has to depend on the senses of the examiner, and there is a problem that variations occur in the specification of the abnormal sound source.
JP 2002-257623 A

An object of the present invention is to provide an allophone generation source specifying device and an allophone generation source specifying method capable of specifying an allophone source without variation.
In order to achieve the above object, according to the present invention, an abnormal sound source identifying device for identifying an abnormal sound source in a mechanical device that emits abnormal noise, the sound wave detecting a sound wave emitted from the mechanical device. Detection means, a plurality of vibration detection means for detecting vibrations at a plurality of locations of the mechanical device, and the vibrations detected by the vibration detection means with respect to the waveform of the sound wave detected by the sound wave detection means Each of the plurality of vibrations, and a specifying means for identifying a portion that generates a vibration having a waveform that most closely approximates the waveform of the sound wave among the plurality of vibrations as an abnormal sound source in the mechanical device, At least an abnormal sound source identification device is provided.

  In order to achieve the above object, according to the present invention, there is provided an abnormal sound source identification method for identifying an abnormal sound source in a mechanical device that emits abnormal noise, the method detecting a sound wave emitted from the mechanical device. And detecting vibrations at a plurality of locations in the mechanical device, comparing the waveforms of the detected vibrations with the waveforms of the detected sound waves, and converting the waveforms of the sound waves into the waveforms of the sound waves. There is provided an abnormal sound generation source specifying method for specifying a portion generating vibration having a waveform that is most approximate as an abnormal noise generation source in the mechanical device.

  In the present invention, abnormal sound waves emitted from the mechanical device are detected, vibrations at a plurality of locations in the mechanical device are detected, and a waveform that is closest to the waveform of the sound waves among the detected plurality of vibrations. A location that generates vibration having a noise is identified as an abnormal sound source. Thereby, it is possible to automatically associate the abnormal sound and the vibration to automate the specification of the abnormal sound source, and it is possible to specify the abnormal sound source without variation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic diagram showing the overall configuration of an abnormal sound source identifying apparatus according to an embodiment of the present invention, FIG. 2 is a flowchart showing the procedure of an abnormal sound source identifying method according to an embodiment of the present invention, and FIG. ) Is a graph showing an example of a sound wave waveform detected by a microphone in the embodiment of the present invention, FIG. 3B is a graph showing an example of a vibration waveform detected by a vibration sensor in the embodiment of the present invention, and FIG. 3A is a graph showing the result of frequency analysis for the sound wave waveform shown in FIG. 3A, FIG. 4B is a graph showing the result of frequency analysis for the vibration waveform shown in FIG. 3B, and FIG. Is a graph showing the sound wave waveform after filtering the sound wave waveform shown in FIG. 3 (A), and FIG. 5 (B) is after filtering the vibration waveform shown in FIG. 3 (B). FIG. 6 is a graph showing the vibration waveform of FIG. It is a graph showing the respective waveforms after the feature enhancement processing respectively to the vibration waveform shown in sonic waveforms and Figure 5 shows in A) (B).

  First, an abnormal sound source specifying device according to an embodiment of the present invention will be described. As shown in FIG. 1, the abnormal sound source specifying device 1 includes eleven vibration sensors 10a to 10k (vibration detecting means). One microphone 20 (sound wave detection means), and a computer 30 that identifies an abnormal sound source based on the vibration waveform and the sound wave waveform detected by the vibration sensors 10a to 10k and the microphone 20, This is a device for specifying an abnormal noise generation source in the shift control mechanism 100 that operates a vehicle transmission device (not shown) via a cable 102 by operating a shift lever 101. In the present invention, the mechanical device to be specified as the abnormal sound source is not particularly limited to the shift control mechanism in the present embodiment, and may be, for example, an engine device for a vehicle. In addition, the abnormal sound emitted from the mechanical device in the present invention includes, for example, the abnormal sound that the driver feels uncomfortable, in addition to the abnormal noise that accompanies the failure of the mechanical device.

  Each of the vibration sensors 10a to 10k of the abnormal sound source identification device 1 is a sensor that detects vibration based on, for example, acceleration, and is attached to each of the shift control mechanisms 100 where there is a high possibility of generating abnormal noise. Specifically, in the present embodiment, each of the vibration sensors 10a to 10k includes a lever driving unit 10a that is driven by the shift lever 101, lever side end portions 10b and 10c of the cable 102, and a mission side end, as shown in FIG. The parts 10d and 10e, and the parts that are driven by the operation of the shift control mechanism 100 such as the vehicle body through parts 10f and 10g through which the cable 102 penetrates the vehicle body, the bolt fastening parts 10h to 10j, and the vehicle body attaching part 10k In this manner, the shift control mechanism 100 is attached to each fixed portion. In FIG. 1, the plate 103 to which the vibration sensor 10 k is attached in the vehicle body attachment portion is fixed to a vehicle body or the like with a bolt, for example, although not shown.

  These vibration sensors 10a to 10k are connected to the computer 30 so that the detected vibration waveform data can be input. Note that the number and mounting position of the vibration detection means in the present invention are not particularly limited to the number and mounting position of the vibration sensors 10a to 10k in the present embodiment, and an arbitrary number of vibration detection means of two or more are set to arbitrary positions. Can be attached.

  The microphone 20 of the abnormal sound source identification device 1 is disposed in the vicinity of the shift lever 101 of the shift control mechanism 100, although not particularly illustrated. The microphone 20 is connected to the computer 30 so that the detected sound wave waveform data can be input. In addition, the number of the sound wave detection means in this invention is not specifically limited to the number of the microphones 20 in this embodiment, What is necessary is just to provide at least 1 sound wave detection means. Further, the arrangement of the sound wave detection means in the present invention is not particularly limited, for example, may be arranged at the driver's ear position in the passenger compartment, from the viewpoint of removing background noise as much as possible around the mechanical device, It is preferable to arrange in the vicinity of the mechanical device to be specified as the abnormal sound source as in this embodiment.

  The computer 30 of the abnormal sound source identification device 1 captures vibration waveform data detected by the vibration sensors 10a to 10k, and also captures sound wave waveform data detected by the microphone 20, and compares each waveform data with a later-described comparison. After performing a series of processing for specifying an abnormal sound source such as enabling processing, noise removal processing, feature enhancement processing, and similarity calculation, various information such as an abnormal sound source identification result is displayed on the display 40. Output is possible. Therefore, the computer 30 in the present embodiment corresponds to a comparison enabling processing unit, a noise removing unit, an enhancement processing unit, and a specifying unit in the claims.

  The specific configuration of the computer 30 is not particularly shown, but is different from an input port for inputting waveform data from the vibration sensors 10a to 10k and the microphone 20, and a RAM for temporarily storing input / output data. A ROM that stores a program for executing a series of processes for specifying a sound generation source and a CPU that processes data from the RAM based on the program read from the ROM are provided. A keyboard 50 for inputting various information to the computer 30 is provided.

  Next, the abnormal sound source identification method according to the present embodiment by the apparatus 1 will be described with reference to the flowchart of FIG. This method for identifying an abnormal sound source can be used when a mechanical device such as the shift control mechanism 100 or the engine device according to the present embodiment is prototyped or in a production line.

  First, in step S10 of FIG. 2, the microphone 20 detects a sound wave emitted from the shift control mechanism 100, and the vibration sensors 10a to 10k detect vibrations at predetermined positions of the shift control mechanism 100, respectively. Sound wave waveform data and vibration waveform data detected by the microphone 20 and the vibration sensors 10a to 10k are taken into the computer 30 through the input port. An example of the sound wave waveform detected by the microphone 20 is shown in FIG. 3A, and an example of the vibration waveform detected by the vibration sensors 10a to 10k is shown in FIG. Although only one vibration waveform is shown in FIG. 3B, there are as many vibration waveforms as the number of vibration detection means attached to the mechanical device in the present invention. For example, in this embodiment, shift control is performed. Since eleven vibration sensors 10a to 10k are attached to the mechanism 100, there are eleven vibration waveforms as shown in FIG.

Next, in step S20 of FIG. 2, the computer 30 adds the sound waveform data and each vibration waveform data to the waveform of the sound wave detected in step S10 and the vibration waveform. For each, comparison processing is performed. The units of sound waves [Pa] and vibrations [m / s ² ] are different from each other and cannot be compared as they are. However, the effect of the difference in units of sound waves and vibrations by this computer 30 can be compared. It is possible to compare the sound wave waveform and the vibration waveform.

  As specific processing contents of the comparison enabling process, the maximum value of the absolute value of the amplitude of the sound wave waveform and the maximum value of the absolute value of the amplitude of the vibration waveform are set to the same value.

More specifically, the processing according to the following Expression 1 is performed on the sound wave waveform detected by the microphone 20 and the vibration waveform detected by each of the vibration sensors 10a to 10k.

However, in the above equation 1, A ₀ = {a ₀ [i], (i = 0,1,..., I−1)} is the data a ₀ [i] at time i before the comparison enabling process. A ₁ = {a ₁ [i], (i = 0,1,..., I-1)} is the data a ₁ [i] at time i after the enabling process. a collected waveform, in this embodiment, ultrasonic wave and the vibration waveform before comparable process is equivalent to waveform a _0, sonic waveform and vibration waveform after the processing is equivalent to waveform a _1.

In the above equation 1, the waveform A ₀ obtained by collecting data along the time axis is divided by the maximum value max | A ₀ | after the absolute value processing, and the maximum value of the amplitude in the waveform A ₁ after the calculation is obtained. By setting it to 1, the influence of the unit is removed.

  The comparison enabling process according to the equation 1 is performed for each of the sound wave waveform and the vibration waveform. In this embodiment, one sound wave waveform detected by the microphone 20 and each vibration sensor 10a to 10k. Each of the 11 vibration waveforms detected by the above is processed. Since the maximum value of the amplitude is 1 in any waveform after the processing, the influence of the unit of sound wave and vibration is removed from any waveform.

  Next, in step S30 of FIG. 2, the computer 30 performs noise removal processing for cutting off a predetermined frequency region so that the noise is removed from the sound wave waveform and the vibration waveform from which the unit influence is removed in step S20. Do this for each vibration waveform.

  Specifically, when the shift control mechanism 100 is used as the target for detecting the abnormal sound source as in the present embodiment, it is difficult for the abnormal sound to be generated in a high frequency region of 500 [Hz] or more, and FIG. As shown in the frequency analysis of the sound wave waveform and the vibration waveform in (A) and (B), there is a relationship between the shape of the sound wave waveform and the shape of the vibration waveform at a frequency of about 200 [Hz] or less (same as above). The noise removal process is performed by a high frequency region cutoff filter that cuts off a frequency region of 500 [Hz] or higher.

  This filtering process is performed on each of the sound wave waveform and the vibration waveform as in the above-described comparison enabling process. In this embodiment, one sound wave waveform detected by the microphone 20 and each vibration sensor are used. Each of the 11 vibration waveforms detected by 10a to 10k is processed. An example of the sound wave waveform filtered in step S30 is shown in FIG. 5A, and an example of the vibration waveform similarly filtered is shown in FIG. In FIG. 5B, only one vibration waveform is shown, but in the present embodiment, eleven vibration sensors 10a to 10k are attached to the shift control mechanism 100, so FIG. There are 11 vibration waveforms after filtering as shown in FIG.

  By such a filtering process, background noise existing around the shift control mechanism 100 is appropriately removed, and an abnormal sound source can be specified accurately. It should be noted that the frequency region cut off by this filter processing can be appropriately set according to the frequency of the abnormal sound generated by the mechanical device that is the target of the abnormal sound generation source, the sound environment around the mechanical device, and the like.

  Next, in step S40 of FIG. 2, the computer 30 performs feature enhancement processing on the sound wave waveform and the vibration waveform, respectively, so as to emphasize the strengths of the amplitudes of the sound wave waveform and the vibration waveform from which noise has been removed in step S30. I do.

As a specific method of this feature enhancement processing, a predetermined one of the waveforms A ₂ = {a ₂ [i], (i = 0, 1,..., I−1)} filtered in step S30 is used. Frame A ′ = {a ′ [j], (j = 0,1,..., J−1)} is extracted, and further, the entire time of the waveform A ₂ according to Equation 2 below over the area, by plotting by calculating the difference between the minimum value minA 'and' maximum amplitude maxA of the 'each frame a, a waveform was enhancement waveform _{a 2 B = {b [j} ], ( j = 0,1, ..., J-1)}.

  More specifically, in this embodiment, 32 frames are defined as one frame (= 32/2000 [sec]) for a sampling frequency of 2 [kHz] (= 1/2000 [sec]). The sound wave waveform is created over the entire time region while shifting by half frame (ie, 16 points (= 16/2000 [sec])), and the maximum and minimum values of the amplitude of the sound wave waveform in each frame By calculating and plotting the difference, the sound wave waveform feature enhancement processing is performed.

  Similarly, 32 points are set as one frame with respect to the sampling frequency 2 [kHz], and such a frame is generated over the entire time region while shifting the frame by half a frame, and the vibration waveform in each frame is generated. By calculating and plotting the difference between the maximum value and the minimum value of each of the amplitudes, the feature emphasis processing of each vibration waveform is performed. In the present embodiment, such feature enhancement processing is performed on each of 11 vibration waveforms detected by the vibration sensors 10a to 10k.

  Such feature enhancement processing facilitates later-described similarity calculation. In particular, when the waveform detected by the microphone 20 or the vibration sensors 10a to 10k is an impact waveform, the feature can be more clearly emphasized. I can do it.

  Next, in step S50 of FIG. 2, the computer 30 compares each vibration waveform with the sound waveform, and calculates the similarity S of each vibration waveform with respect to the sound waveform.

  Specifically, the similarity S is basically calculated based on the difference between the amplitude of the enhanced sound waveform and the amplitude of the enhanced vibration waveform. In the present embodiment, for example, The similarity S is calculated by applying a DP matching method (Dynamic Programming Matching) used in a technical field such as speech recognition.

In the method of calculating the similarity S using the DP matching method, as shown in the following equations 3 and 4, the sound wave waveform X = {x [m], (m = 0, 1,..., M− 1)} data x [m] at each time m and vibration waveform Y = {y [n], (n = 0, 1,... N-1)} each data Y [n at each time n ] And the amplitude x [m _k ] of the sound waveform X and the amplitude Y [n _k ] of the vibration waveform Y at each lattice point k (k = 0, 1,..., K−1) The smallest of the accumulated amplitude differences obtained by adding the difference d [k] (see the following formula 4) over the entire time region of the enhanced sound wave waveform and the amplitude waveform is defined as the similarity S (the following formula 3). reference). Note that both the sound wave waveform X and the vibration waveform Y correspond to the waveform B after the above feature enhancement processing. Further, w [k] in Equation 3 below is a weight at each lattice point k and can be arbitrarily set.

In the present embodiment, since 11 pieces of the vibration waveform by the vibration sensors 10a~10k is detected, in step S50, eleven similarity _S 1 _{to S 11} corresponding to the vibration waveform is calculated. Incidentally, each of the similarities S _{1 to} S ₁₁ calculated in step S50 expresses the degree of approximation of each vibration waveform with respect to the sound wave waveform, and the closer this value is, the larger the approximation is. In the case of zero, it means that the sound wave waveform and the vibration waveform are the same waveform.

  In this embodiment, by calculating the similarity of the vibration waveform with respect to the sound wave waveform using the DP matching method, the sound wave waveform and the vibration waveform can be compared even at different times. It is possible to accurately calculate the degree.

  Next, in step S <b> 60 of FIG. 2, the computer 30 specifies an abnormal sound generation source by specifying a vibration waveform having a waveform that most closely approximates the sound wave waveform among the 11 vibration waveforms.

As a specific method for specifying the vibration waveform that is most approximate to the sound wave waveform, the vibration waveform having the minimum value among the ₁₁ similarities S _{1 to} S ₁₁ calculated in step S50 described above is the most. Since it approximates the sound wave waveform, the location where the vibration sensor that detects the vibration waveform having the minimum similarity is attached is specified as the abnormal sound source in the shift control mechanism 100.

In the present embodiment, the similarity of the vibration waveform detected respectively in each of the vibration sensors 10a~10k is _S 1 _{to S 11} each, for example, the vibration sensor 10b attached to the end of the shift lever 101 of the cable 102 similarity similarity S ₂ of the detected vibration waveform by S ₁ in the case to S ₁₁ was minimal in the different ends of the shift lever 101 of the cable 102 that the vibration sensor 10b is attached Identified as a sound source. The noise generation source specified in this way is displayed on the display 40 from the computer 30.

  As described above, in the present embodiment, abnormal sound waves emitted from a mechanical device such as a shift control mechanism are detected, and vibrations at a plurality of locations in the mechanical device are detected. Among the detected plurality of vibrations, By identifying the location of the vibration that has the waveform closest to the waveform of the sound wave as an abnormal sound source, the abnormal sound and the vibration are automatically associated to automate the identification of the abnormal sound source. Therefore, it is possible to accurately identify the noise generation source without variation.

  In addition, when identifying an abnormal sound source depending on the inspector's sense as in the past, it is necessary to repeat the cycle of removing the specified parts and performing a reproduction experiment, which requires a lot of man-hours. However, a significant reduction in man-hours can be achieved by automating the identification of abnormal noise sources.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

FIG. 1 is a schematic diagram illustrating the overall configuration of an abnormal sound source identification device according to an embodiment of the present invention. FIG. 2 is a flowchart showing the procedure of the abnormal sound source specifying method according to the embodiment of the present invention. FIG. 3A is a graph showing an example of a sound wave waveform detected by the microphone in the embodiment of the present invention, and FIG. 3B is a graph of the vibration waveform detected by the vibration sensor in the embodiment of the present invention. It is a graph which shows an example. 4A is a graph showing the result of frequency analysis for the sound wave waveform shown in FIG. 3A, and FIG. 4B shows the result of frequency analysis for the vibration waveform shown in FIG. 3B. It is a graph. FIG. 5A is a graph showing a sound wave waveform after filtering the sound wave waveform shown in FIG. 3A, and FIG. 5B is a vibration waveform shown in FIG. It is a graph which shows the vibration waveform after performing a filter process with respect to. FIG. 6 is a graph showing each waveform after the feature enhancement processing is performed on the sound wave waveform shown in FIG. 5A and the vibration waveform shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Noise source identification apparatus 10a-10k ... Vibration sensor 20 ... Microphone 30 ... Computer 40 ... Display 50 ... Keyboard 100 ... Shift control mechanism 101 ... Shift lever 102 ... Cable 103 ... Plate

Claims (16)

An abnormal sound source identifying device for identifying an abnormal sound source in a mechanical device that emits abnormal noise,
Sound wave detecting means for detecting sound waves emitted from the mechanical device;
A plurality of vibration detecting means for detecting vibrations at a plurality of locations of the mechanical device;
The waveform of each of the vibrations detected by each of the vibration detection means is compared with the waveform of the sound wave detected by the sound wave detection means, and the waveform of the sound wave is most approximated among the plurality of vibrations. An apparatus for identifying an abnormal sound source comprising at least specifying means for identifying a portion generating vibration having a waveform as an abnormal sound source in the mechanical device. Comparability processing means for processing the waveforms of the sound waves detected by the sound wave detection means and the waveforms of the vibrations detected by the plurality of vibration detection means so as to be comparable,
Enhancement processing means for processing to emphasize the characteristics of the waveform of the sound wave processed by the comparison enabling processing means and the characteristics of the waveforms of the vibrations processed by the comparison enabling processing means; Further comprising
The specifying unit compares the waveform of each vibration processed by the enhancement processing unit with the waveform of the sound wave processed by the enhancement processing unit, and the waveform of the sound wave among the plurality of vibrations. The abnormal sound source identifying device according to claim 1, wherein a portion generating vibration having a waveform that is most approximate to is identified as an abnormal sound source in the mechanical device.   The noise generation source specifying device according to claim 2, wherein the characteristic of the waveform includes the amplitude of the waveform.   The comparison enabling processing unit has the same value as the maximum absolute value of the amplitude of the sound wave detected by the sound wave detection unit and the maximum absolute value of the amplitude of the vibration detected by the vibration detection unit. The abnormal sound source identification device according to claim 2 or 3, wherein the processing is performed so that the waveform of the sound wave and the waveform of the vibration can be compared.   The enhancement processing unit plots the difference between the maximum value and the minimum value of the amplitude of the sound wave over a predetermined time length over the entire time region of the sound wave detected by the sound wave detection unit. And the difference between the maximum value and the minimum value of the vibration amplitude in the predetermined time length is the total time of the vibration detected by the vibration detection means. The abnormal sound source identification device according to any one of claims 2 to 4, wherein processing is performed so as to emphasize a characteristic of the vibration waveform by plotting over a region.   The specifying means determines the similarity of the vibration waveform to the sound wave waveform, the amplitude of the sound wave waveform processed by the enhancement processing means, and the amplitude of the vibration waveform processed by the enhancement processing means. The abnormal noise generation source specifying device according to claim 2, wherein the noise generation source is specified for each of the vibrations based on the difference between the noises, and a portion generating the vibration with the minimum similarity is specified as an abnormal noise generation source.   The abnormal sound source identification device according to claim 6, wherein the identification unit calculates the similarity by a DP matching method.   8. The apparatus according to claim 1, further comprising a noise removing unit that cuts off a predetermined frequency region in the waveform of the sound wave detected by the sound wave detecting unit and the waveform of the vibration detected by the vibration detecting unit. An apparatus for identifying an abnormal sound source described in 1. An abnormal sound source identifying method for identifying an abnormal sound source in a mechanical device that emits abnormal noise,
Detecting sound waves emitted from the mechanical device, detecting vibrations at a plurality of locations in the mechanical device, comparing the waveforms of the detected vibrations with the detected sound wave waveforms, and An abnormal sound source specifying method for specifying a portion generating vibrations having a waveform most similar to the waveform of the sound wave as an abnormal sound source in the mechanical device. Detecting the sound wave emitted from the mechanical device and detecting vibrations at a plurality of locations in the mechanical device;
A comparison enabling processing step for processing the detected sound wave waveform and the detected vibration waveform so as to be comparable; and
An emphasis processing step for emphasizing the characteristics of the waveform of the sound wave subjected to the comparison processing and the characteristics of the waveform of each vibration subjected to the comparison processing;
Compare each waveform of each of the enhanced vibrations with respect to the waveform of the enhanced sound wave, and generate a vibration having a waveform that is closest to the waveform of the sound wave among the plurality of vibrations. The abnormal sound source specifying method according to claim 9, further comprising: a specifying step of specifying a place where the noise is present as an abnormal sound source in the mechanical device.   The abnormal sound source identification method according to claim 10, wherein the characteristic of the waveform includes the amplitude of the waveform.   In the comparison enabling processing step, the maximum value of the absolute value of the amplitude of the detected sound wave and the maximum value of the absolute value of the amplitude of the detected vibration are set to the same value, so that the waveform of the sound wave and 12. The abnormal sound source identification method according to claim 10 or 11, wherein the processing is performed so that the waveform of the vibration can be compared.   In the emphasis processing step, the difference between the maximum value and the minimum value of the amplitude of the sound wave in a predetermined time length is plotted over the entire time region of the sound wave detected in the detection step. Processing is performed to emphasize the characteristics of the waveform, and the difference between the maximum value and the minimum value of the amplitude of the vibration in the predetermined time length is determined over the entire time region of the vibration detected in the detection step. The abnormal noise generation source specifying method according to claim 10, wherein processing is performed so as to emphasize the characteristics of the vibration waveform by plotting.   In the specifying step, the degree of similarity of the vibration waveform with respect to the waveform of the sound wave, the amplitude of the waveform of the sound wave processed in the enhancement processing step, and the amplitude of the waveform of vibration processed in the enhancement processing step The abnormal sound source identification method according to any one of claims 9 to 13, wherein the noise generation source is specified for each vibration based on the difference between the noises, and a portion generating the vibration having the minimum similarity is identified as an abnormal noise generation source.   The abnormal sound source identification method according to claim 14, wherein the similarity is calculated by a DP matching method in the identification step.   The noise removing step of cutting off a predetermined frequency region in the waveform of the sound wave detected in the detecting step and the waveform of the vibration detected in the detecting step is further provided. Method for identifying abnormal noise sources.

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