Method, apparatus, and program for evaluating the operating noise of rotating machinery.

Abstract

To provide a method, device and program for evaluating the operation noise of a rotary machine.SOLUTION: The present invention comprises: a step in which 1 / 24-octave band analysis is carried out on the operation noise of a rotary machine, and a 1 / 24-octave band spectrum is generated that indicates a relationship between frequency and sound pressure level for each 1 / 24 octave; a step in which the process of setting a 1 / 1-octave band frame to the 1 / 24-octave band spectrum, calculating a reference level based on the energy sum of the sound pressure levels of 1 / 24-octave components included in the frame, and subtracting the reference level from the sound pressure levels of the components for the 1 / 24-octave components included in the frame so as to obtain a protruding level, is carried out by shifting the 1 / 1-octave band frame a 1 / 24 octave at a time; and a step in which the scores of the 1 / 24-octave components are calculated on the basis of the protruding level regarding the 1 / 24-octave components that was calculated in each of the 1 / 1-octave band frame.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method, apparatus, and program for evaluating the operating sound of a rotating machine.

Background Art

[0002] Rotating machines such as pumps and blowers emit operating sounds more or less. If the sound pressure level at a specific frequency included in the operating sound is prominent, it can cause unpleasant noise. On the other hand, even if the sound pressure level at a certain frequency is high, if there are other frequencies with high sound pressure levels, it may not cause unpleasant noise. Such a phenomenon is known as the auditory masking effect.

[0003] On the spectrum obtained by the existing narrow-band analysis (FFT method), there are multiple peaks, and it may be difficult to identify which of them causes unpleasant noise.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a method, apparatus, and program for evaluating the operating sound of a rotating machine.

Means for Solving the Problems

[0006] According to one aspect of the present invention, there is provided a method for evaluating the operating sound of a rotating machine, comprising: It should be noted that there is an error in the original text where "特開2019-95315号公報" is translated as "Japanese Patent Laid-Open No. 2019-95315" in the above translation. It should be "Japanese Unexamined Patent Application Publication No. 2019-95315". And there is also an error in the translation of "三十三" which should be corrected according to the correct content. The corrected translation is as follows:

Technical Field

[0001] The present invention relates to a method, apparatus, and program for evaluating the operating sound of a rotating machine.

Background Art

[0002] Rotating machines such as pumps and blowers emit operating sounds more or less. If the sound pressure level at a specific frequency included in the operating sound is prominent, it can cause unpleasant noise. On the other hand, even if the sound pressure level at a certain frequency is high, if there are other frequencies with high sound pressure levels, it may not cause unpleasant noise. Such a phenomenon is known as the auditory masking effect.

[0003] On the spectrum obtained by the existing narrow-band analysis (FFT method), there are multiple peaks, and it may be difficult to identify which of them causes unpleasant noise.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a method, apparatus, and program for evaluating the operating sound of a rotating machine.

Means for Solving the Problems

[0006] According to one aspect of the present invention, there is provided a method for evaluating the operating sound of a rotating machine, comprising: The steps include: performing a 1 / 24 octave band analysis on the operating noise of the rotating machine and generating a 1 / 24 octave band spectrum showing the relationship between frequency and sound pressure level for each 1 / 24 octave; (1) In the 1 / 24 octave band spectrum, a 1 / 1 octave band frame is set; (2) A reference level is calculated based on the energy sum of the sound pressure levels of each 1 / 24 octave component contained within the set frame; (3) For each 1 / 24 octave component contained within the set frame, the value obtained by subtracting the reference level from the sound pressure level of that component is calculated as the prominence level; this is done while shifting the 1 / 1 octave band frame by 1 / 24 octaves at a time; A method is provided which includes the step of calculating a score for each of the 1 / 24 octave components based on the prominence level for each of the 1 / 24 octave components calculated within each of the 1 / 1 octave bands.

[0007] The aforementioned reference level may be the value obtained by subtracting a predetermined value from the energy sum of the sound pressure levels of each 1 / 24 octave component included in the set frame.

[0008] The score may be the sum, arithmetic mean, or energy mean of the outlier levels calculated within each of the 1 / 1 octave bands.

[0009] According to one aspect of the present invention, a method for evaluating the operating noise of a rotating machine, The steps include: performing a 1 / 24 octave band analysis on the operating noise of the rotating machine and generating a 1 / 24 octave band spectrum showing the relationship between frequency and sound pressure level for each 1 / 24 octave; (1) In the 1 / 24 octave band spectrum, a frame based on the critical bandwidth is set; (2) A reference level is calculated based on the energy sum of the sound pressure levels of each 1 / 24 octave component included in the set frame; and (3) For each 1 / 24 octave component included in the set frame, the value obtained by subtracting the reference level from the sound pressure level of that component is calculated as the prominence level, and this is done while shifting the frame based on the critical bandwidth by 1 / 24 octaves at a time. A method is provided which includes the step of calculating a score for each of the 1 / 24 octave components based on the protrusion level for each of the 1 / 24 octave components calculated in each of the frames based on the critical bandwidth.

[0010] Setting a frame based on the critical bandwidth may involve setting a frame corresponding to a set frequency, based on a predetermined relationship between the frequency and the critical bandwidth.

[0011] Setting a frame based on the critical bandwidth may involve setting a frame corresponding to the set frequency based on an approximate formula that shows the relationship between a predetermined frequency and the critical bandwidth.

[0012] According to one aspect of the present invention, a device for evaluating the operating noise of a rotating machine, A means for performing 1 / 24 octave band analysis on the operating noise of the aforementioned rotating machine and generating a 1 / 24 octave band spectrum showing the relationship between frequency and sound pressure level for each 1 / 24 octave, (1) In the 1 / 24 octave band spectrum, a frame of 1 / 1 octave bands is set; (2) A reference level is calculated based on the energy sum of the sound pressure levels of each 1 / 24 octave component contained within the set frame; and (3) For each 1 / 24 octave component contained within the set frame, the value obtained by subtracting the reference level from the sound pressure level of that component is calculated as the prominence level, and this is done while shifting the frame of the 1 / 1 octave band by 1 / 24 octaves at a time. The present invention provides a means for calculating the score of each of the 1 / 24 octave components based on the protrusion level for each of the 1 / 24 octave components calculated within each of the frames of the 1 / 1 octave band.

[0013] According to one aspect of the present invention, a program for evaluating the operating noise of a rotating machine, wherein a computer is used. A means for performing 1 / 24 octave band analysis on the operating noise of the aforementioned rotating machine and generating a 1 / 24 octave band spectrum showing the relationship between frequency and sound pressure level for each 1 / 24 octave, (1) In the 1 / 24 octave band spectrum, a frame of 1 / 1 octave bands is set; (2) A reference level is calculated based on the energy sum of the sound pressure levels of each 1 / 24 octave component contained within the set frame; and (3) For each 1 / 24 octave component contained within the set frame, the value obtained by subtracting the reference level from the sound pressure level of that component is calculated as the prominence level, and this is done while shifting the frame of the 1 / 1 octave band by 1 / 24 octaves at a time. A program is provided that functions as a means for calculating the score of each of the 1 / 24 octave components based on the prominence level of each of the 1 / 24 octave components calculated within each of the 1 / 1 octave band frames.

[0014] According to one aspect of the present invention, a device for evaluating the operating noise of a rotating machine, A means for performing 1 / 24 octave band analysis on the operating noise of the aforementioned rotating machine and generating a 1 / 24 octave band spectrum showing the relationship between frequency and sound pressure level for each 1 / 24 octave, (1) In the 1 / 24 octave band spectrum, set a frame based on the critical bandwidth, (2) calculate a reference level based on the energy sum of the sound pressure levels of each 1 / 24 octave component included in the set frame, and (3) for each 1 / 24 octave component included in the set frame, calculate the value obtained by subtracting the reference level from the sound pressure level of the component as the prominence level, and perform this while shifting the frame based on the critical bandwidth by 1 / 24 octave each time. There is provided an apparatus including means for calculating a score for each of the 1 / 24 octave components based on the prominence level for each of the 1 / 24 octave components calculated in each of the frames based on the critical bandwidth.

[0015] According to one aspect of the present invention, there is a program for evaluating the operating sound of a rotating machine, which causes a computer to perform 1 / 24 octave band analysis on the operating sound of the rotating machine to generate a 1 / 24 octave band spectrum showing the relationship between frequency and sound pressure level for each 1 / 24 octave. (1) In the 1 / 24 octave band spectrum, set a frame based on the critical bandwidth, (2) calculate a reference level based on the energy sum of the sound pressure levels of each 1 / 24 octave component included in the set frame, and (3) for each 1 / 24 octave component included in the set frame, calculate the value obtained by subtracting the reference level from the sound pressure level of the component as the prominence level, and perform this while shifting the frame based on the critical bandwidth by 1 / 24 octave each time. There is provided a program that functions as means for calculating a score for each of the 1 / 24 octave components based on the prominence level for each of the 1 / 24 octave components calculated in each of the frames based on the critical bandwidth.

Advantages of the Invention

[0016] The operating sound of a rotating machine can be evaluated.

Brief Description of the Drawings

[0017] [Figure 1] A flowchart showing an example of a processing procedure for evaluating the operating noise of a rotating machine. [Figure 2A] A diagram schematically showing the generated 1 / 24 octave band spectrum. [Figure 2B] A diagram schematically showing an enlarged part of the generated 1 / 24 octave band spectrum. [Figure 3A] A diagram schematically showing the first frame set in the 1 / 24 octave band spectrum of FIG. 2A. [Figure 3B] A diagram schematically showing an enlarged view of the vicinity of the first frame in the 1 / 24 octave band spectrum. [Figure 4] A diagram schematically showing the prominence levels of the 1 / 24 octave components included in each frame. [Figure 5A] A diagram schematically showing the second frame set in the 1 / 24 octave band spectrum of FIG. 2A. [Figure 5B] A diagram schematically showing an enlarged view of the vicinity of the second frame in the 1 / 24 octave band spectrum. [Figure 6A] A diagram for explaining the prominence level in the 1 / 24 octave component. [Figure 6B] A diagram for explaining the prominence level in the 1 / 24 octave component. [Figure 7] A diagram schematically showing the score S together with the 1 / 24 octave band spectrum shown in FIG. 2A. [Figure 8] A diagram showing the relationship between the frequency f and the critical bandwidth Δf. [Figure 9] A diagram showing the relationship between the frequency f and the critical bandwidth Δf according to an approximation formula.

Modes for Carrying Out the Invention

[0018] Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

[0019] (First Embodiment) Figure 1 is a flowchart showing an example of a processing procedure for evaluating the operating noise of a rotating machine according to the first embodiment.

[0020] First, the operating noise of the rotating machinery to be evaluated (e.g., pumps and blowers) is acquired using a microphone or similar device (Step S1). This allows the sound pressure level for each frequency to be obtained.

[0021] Next, a 1 / 24 octave band analysis is performed on the acquired operating sound to generate a 1 / 24 octave band spectrum (Step S2).

[0022] Figure 2A schematically shows the generated 1 / 24 octave band spectrum. Figure 2B schematically shows a magnified portion of the generated 1 / 24 octave band spectrum. As shown in Figure 2B, the 1 / 24 octave band spectrum shows the sound pressure levels P1, P2, P3... at each of the 1 / 24 octave frequencies f1, f2, f3....

[0023] Returning to Figure 1, a frame of the i-th 1 / 1 octave band (hereinafter sometimes simply referred to as the "frame") is set on the generated 1 / 24 octave band spectrum (step S3A). The first frame is set so that its lower end (lowest frequency) includes the desired frequency (for example, the lowest frequency of the acquired operating sound).

[0024] Figure 3A schematically shows the first frame set in the 1 / 24 octave band spectrum of Figure 2A. Figure 3B schematically shows a magnified view of the vicinity of the first frame in the 1 / 24 octave band spectrum.

[0025] To define a 1 / 1 octave band frame within a 1 / 24 octave band spectrum, the frame contains 24 1 / 24 octave components. Below, the frequencies corresponding to these 24 1 / 24 octave components contained in this first frame will be denoted as frequencies f1 to f24, starting from the lowest frequency.

[0026] Returning to Figure 1, we calculate the reference level for the first set frame (step S3B). The reference level is based on the sound pressure level of each 1 / 24 octave component contained within the frame. If Pk is the sound pressure level of the 1 / 24 octave component corresponding to frequency fk (k=1~24), then assuming that sound pressure levels P1~P24 are the same, the sound pressure level (energy) of the 1 / 24 octave component will be 1 / 24 compared to the 1 / 1 octave (equivalent to -13.8 dB). Therefore, as an example, the reference level A1 for the first frame (generally, the reference level for the i-th frame is Ai) can be calculated using the following equation (1).

[0027] Reference level A1 = 10 * log(Σ10) Pk / 10 )-10*log24 =10*log(Σ10 Pk / 10 )-13.8 ···(2)

[0028] In other words, the reference level A1 is the sum of the energies of the respective sound pressure levels P1 to P24 of the 1 / 24 octave components f1 to f24 contained within the frame, 10*logΣ10 Pk / 10 It can be the value obtained by subtracting a predetermined value (13.8) from that value.

[0029] Next, the protrusion level is calculated for each of the 24 1 / 24 octave components contained in the first frame (step S3C). As an example, the protrusion level Qk_1 of the 1 / 24 octave component corresponding to frequency fk (k=1~24) in the first frame (generally, the protrusion level Qk_i of the 1 / 24 octave component corresponding to frequency fk in the i-th frame) can be calculated using the following equation (3).

[0030] Qk_1 = Pk - Reference Level A1 ... (3)

[0031] In other words, for each of the 1 / 24 octave components included in the set frame, the protrusion level can be defined as the value obtained by subtracting the reference level from the sound pressure level of each component.

[0032] This completes the processing for the first frame that was set. Figure 4 schematically shows the protrusion levels Q1_1 to Q24_1 of the 1 / 24 octave component corresponding to frequencies f1 to f24 in the first frame.

[0033] Here, if the sound pressure level of the 1 / 24 octave component corresponding to a certain frequency fk is high, and there are other components with high sound pressure levels within the first frame, the prominence level Qk_1 will be relatively low. This is because the reference level A1 becomes larger. In this way, when there are other frequencies with high sound pressure levels around the peak frequency fk of interest, a prominence level Qk_1 is obtained that indicates that the sound of this frequency fk is not very noticeable.

[0034] On the other hand, even if the sound pressure level of the 1 / 24 octave component corresponding to the same frequency fk is high, if there are no other components with high sound pressure levels within the first frame, the prominence level Qk_1 will be relatively high. This is because the reference level A1 becomes smaller. In this way, when there are no other frequencies with high sound pressure levels around the peak frequency fk of interest, a prominence level Qk_1 is obtained that indicates how prominent the sound of this frequency fk is heard.

[0035] In this embodiment, since the reference level A1 is determined by the sound pressure level of the 1 / 24 octave component included within the frame, the calculated protrusion level Qk_1 incorporates the influence of the sound pressure level of the surrounding band and takes into account the auditory masking effect.

[0036] Next, shift the first frame by 1 / 24 octave and set the next second frame to a 1 / 24 octave band spectrum (YES, S3A in step S3D).

[0037] FIG. 5A is a diagram schematically showing the second frame set in the 1 / 24 octave band spectrum of FIG. 2A. FIG. 5B is a diagram schematically showing an enlarged view of a vicinity portion of the second frame in the 1 / 24 octave band spectrum. When comparing FIG. 3B and FIG. 5B, since the frame is shifted by only 1 / 24 octave, the 1 / 24 octave component corresponding to the frequency f1 included in the first frame is not included in the second frame, and the 1 / 24 octave component corresponding to the frequency f25 not included in the first frame is included in the second frame.

[0038] Then, a reference level A2 for the second frame is calculated (step S3B). Similar to the reference level A1 for the first frame, it can be calculated by the following equation (4).

[0039] Reference level A2 = 10 * log(Σ10 Pk / 10 ) - 10 * log24 = 10 * log(Σ10 Pk / 10 ) - 13.8 ···(4)

[0040] The calculation formula itself is the same as the reference level A1 in the first frame. However, the reference level can vary depending on the sound pressure level of the 1 / 24 octave components included in the frame. Specifically, the higher the overall sound pressure level of the 1 / 24 octave components included in the frame, the higher the reference level. More specifically, if P1 < P25, the reference level A2 of the second frame is higher than the reference level A1 of the first frame.

[0041] Next, a prominence level is calculated for each of the 24 1 / 24 octave components included in the second frame (step S3C). In the second frame, the prominence level Qk_2 of the 1 / 24 octave component corresponding to the frequency fk (k = 2 to 25) can be calculated by the following equation (5).

[0042] Qk_2 = Pk - reference level A2 ···(5)

[0043] This completes the processing for the second frame that was set. Figure 4 schematically shows the protrusion levels Q2_2 to Q25_2 of the 1 / 24 octave component corresponding to frequencies f2 to f25, respectively.

[0044] The above steps S3A to S3D are performed while shifting the frame by 1 / 24 octave at a time until the upper end (highest frequency) of the set frame reaches the desired frequency (for example, the highest frequency of the acquired operating sound).

[0045] Based on the above, the projection level for each 1 / 24 octave component is calculated for each frame. Here, since the reference level is calculated for each frame, the projection level for a 1 / 24 octave component in one frame may differ from the projection level for a 1 / 24 octave component in another frame. This will be explained using Figures 6A and 6B.

[0046] For example, as shown in Figure 6A, a certain m-th box contains frequency fx. Since frequency fx is the only peak in this m-th box, the reference level Am is a small value. Therefore, the prominence level Qx_m of the 1 / 24 octave component corresponding to that frequency fx is a relatively large value. In this way, because there are no other frequencies with high sound pressure levels around the peak frequency fx of interest, we obtain a prominence level Qx_m that indicates how much more noticeable the sound of this frequency fx is.

[0047] On the other hand, as shown in Figure 6B, another nth frame also contains frequency fx. However, since there are other peaks in this nth frame besides frequency fx, the reference level An becomes a large value. Therefore, the prominence level Qx_n of the 1 / 24 octave component corresponding to that frequency fx becomes a relatively small value.

[0048] Thus, in this embodiment, the protrusion level is calculated by also considering the sound pressure levels of other frequencies included in the frame (i.e., in the peripheral band).

[0049] Returning to Figure 1, after calculating the prominence level for all frames, the score for each 1 / 24 octave component is calculated based on the prominence level for each 1 / 24 octave component calculated for each 1 / 1 octave band frame (Step S4).

[0050] For example, as shown in Figure 4, the 1 / 24 octave component corresponding to frequency f24 is included in the 1st to 24th frames, and the prominence levels Q24_1 to Q24_24 are calculated. Therefore, the score S24 of the 1 / 24 octave component corresponding to frequency f24 (generally, the score for frequency fk is denoted as sk) is obtained by statistically processing the prominence levels Q24_1 to Q24_24 (e.g., summation, arithmetic mean, or energy mean). The score obtained in this way indicates the dominance of the sound, taking into account the sound pressure levels of the surrounding bands.

[0051] Then, the scores are graphed as needed (Step S5). Figure 7 schematically shows the score S together with the 1 / 24 octave band spectrum shown in Figure 2A. This graph represents the score for each of the 1 / 24 octave components. This score allows, for example, an operator to easily identify frequencies that may cause unpleasant noise. Specifically, frequencies with high scores can be identified as frequencies that cause unpleasant noise.

[0052] As described above, in this embodiment, a 1 / 1 octave band frame is set for a 1 / 24 octave band spectrum, and a reference level is calculated for each frame. Then, the prominence level of each 1 / 24 octave band spectrum is calculated based on this reference value. Therefore, a score can be calculated for each 1 / 24 octave band spectrum, taking into account the sound pressure level of the surrounding band (i.e., taking into account the auditory masking effect). Based on this score, frequencies that may cause unpleasant noise can be easily identified.

[0053] Further, part or all of the processes shown in FIG. 1 may be performed manually, or a program for performing each process may be prepared and each process may be performed by a computer executing the program.

[0054] (Second Embodiment) The second embodiment to be described next is a modification of the first embodiment. Hereinafter, the differences from the first embodiment will be mainly described.

[0055] In the present embodiment, in step S3A of FIG. 1, instead of setting the 1 / 1 octave band frame, a frame based on the critical bandwidth Δf is set. The critical bandwidth Δf corresponds to the frequency range of auditory masking. The relationship between the frequency f and the critical bandwidth Δf is determined in advance, for example, as shown in FIG. 8, and the critical bandwidth Δf increases non-linearly as the frequency f increases. Therefore, generally, when i < i', the bandwidth of the frame set at the i'-th position is wider than the frame set at the i-th position.

[0056] For example, in FIG. 3B, the first frame is set for the frequency f1. As an example, if the i-th frame is set for the frequency 50 Hz, referring to FIG. 8, the bandwidth of that frame is 100 Hz. On the other hand, if the i'-th frame is set for the frequency 1,000 Hz, referring to FIG. 8, the bandwidth of that frame is 160 Hz.

[0057] However, in FIG. 8, the relationship between the frequency f and the critical bandwidth Δf is only defined discretely. Therefore, depending on the set frequency, the critical bandwidth Δf may not be defined in advance. For example, the critical bandwidth Δf when the set frequency is 900 Hz is not defined in FIG. 8.

[0058] Therefore, an approximate formula (for example, a polynomial) showing the relationship between the frequency f and the critical bandwidth Δf may be prepared. And the critical bandwidth Δf corresponding to the set frequency f may be calculated to set the frame.

[0059] The approximation formula may be, for example, the cubic equation shown below. Figure 9 shows the relationship between frequency f and critical bandwidth Δf based on this approximation formula. Δf = a*f 3 +b*f 2 +c*f+d a = -0.0000000003 b = 0.0000173187 c=0.0831250103 d=76.1402217580

[0060] In the first embodiment, a 1 / 1 octave band frame is set, so the frame contains 24 1 / 24 octave components. In contrast, in this embodiment, a frame is set based on a critical bandwidth Δf that increases with increasing frequency, so the number of 1 / 24 octave components included in the frame is not constant and increases with increasing frequency.

[0061] Even in that case, the reference level Ai in step S3B of Figure 1 can be calculated using the same approach as in the first embodiment. Specifically, if Mi is the number of components contained in the i-th frame, the reference level Ai is expressed by the following formula.

[0062] Reference level Ai = 10 * log(Σ10) Pk / 10 )-10*log(Mi)

[0063] Furthermore, in step S3C of Figure 1, the protrusion level is calculated for each of the Mi components contained within the frame. Other processing may be the same as in the first embodiment.

[0064] Thus, in the second embodiment, since a frame based on the critical bandwidth is set, it is possible to more accurately and easily identify frequencies that may cause unpleasant noise.

[0065] Furthermore, the first embodiment can be considered as an approximation of the critical bandwidth in the second embodiment to 1 / 1 octave. According to the first embodiment, there is no need to calculate the approximation formula, and the 1 / 1 octave band frame is always set, making the processing simpler. On the other hand, according to the second embodiment, accuracy is improved because the frame is set based on the critical bandwidth corresponding to the frequency range of auditory masking.

[0066] The embodiments described above are intended to enable persons with ordinary skill in the art to implement the present invention. Various modifications of the above embodiments can be made naturally by those skilled in the art, and the technical idea of ​​the present invention can be applied to other embodiments as well. Therefore, the present invention is not limited to the embodiments described, but should be in the broadest scope according to the technical idea defined by the claims.

Claims

1. A method for evaluating the operating noise of rotating machinery, The steps include: performing a 1 / 24 octave band analysis on the operating noise of the rotating machine and generating a 1 / 24 octave band spectrum showing the relationship between frequency and sound pressure level for each 1 / 24 octave; (1) In the 1 / 24 octave band spectrum, a 1 / 1 octave band frame is set; (2) A reference level is calculated based on the energy sum of the sound pressure levels of each 1 / 24 octave component contained within the set frame; (3) For each 1 / 24 octave component contained within the set frame, the value obtained by subtracting the reference level from the sound pressure level of that component is calculated as the peak level; and these steps are performed while shifting the 1 / 1 octave band frame by 1 / 24 octaves at a time. A method comprising the step of calculating a score for each of the 1 / 24 octave components based on the prominence level for each of the 1 / 24 octave components calculated within each of the frames of the 1 / 1 octave band.

2. The method according to claim 1, wherein the reference level is the value obtained by subtracting a predetermined value from the energy sum of the sound pressure levels of each 1 / 24 octave component included in the set frame.

3. The method according to claim 1 or 2, wherein the score is the sum, arithmetic mean, or energy mean of the outlier levels calculated within each of the 1 / 1 octave bands.

4. A method for evaluating the operating noise of rotating machinery, The steps include: performing a 1 / 24 octave band analysis on the operating noise of the rotating machine and generating a 1 / 24 octave band spectrum showing the relationship between frequency and sound pressure level for each 1 / 24 octave; (1) In the 1 / 24 octave band spectrum, a frame based on the critical bandwidth is set; (2) A reference level is calculated based on the energy sum of the sound pressure levels of each 1 / 24 octave component included in the set frame; (3) For each 1 / 24 octave component included in the set frame, the value obtained by subtracting the reference level from the sound pressure level of that component is calculated as the peak level; and these steps are performed while shifting the frame based on the critical bandwidth by 1 / 24 octaves at a time. A method comprising the step of calculating a score for each of the 1 / 24 octave components based on the protrusion level for each of the 1 / 24 octave components calculated in each of the frames based on the critical bandwidth.

5. The method according to claim 4, wherein setting a frame based on the critical bandwidth means setting a frame according to the set frequency based on a predetermined relationship between the frequency and the critical bandwidth.

6. The method according to claim 4, wherein setting a frame based on the critical bandwidth means setting a frame according to the set frequency based on an approximate formula showing the relationship between a predetermined frequency and the critical bandwidth.

7. A device for evaluating the operating noise of rotating machinery, A means for performing 1 / 24 octave band analysis on the operating noise of the aforementioned rotating machine and generating a 1 / 24 octave band spectrum showing the relationship between frequency and sound pressure level for each 1 / 24 octave, (1) In the 1 / 24 octave band spectrum, a frame of 1 / 1 octave bands is set; (2) A reference level is calculated based on the energy sum of the sound pressure levels of each 1 / 24 octave component contained within the set frame; and (3) For each 1 / 24 octave component contained within the set frame, the value obtained by subtracting the reference level from the sound pressure level of that component is calculated as the peak level, and this is done while shifting the frame of the 1 / 1 octave band by 1 / 24 octaves, An apparatus comprising: means for calculating the score of each of the 1 / 24 octave components based on the protrusion level for each of the 1 / 24 octave components calculated within each of the frames of the 1 / 1 octave band.

8. A program for evaluating the operating noise of rotating machinery, using a computer, A means for performing 1 / 24 octave band analysis on the operating noise of the aforementioned rotating machine and generating a 1 / 24 octave band spectrum showing the relationship between frequency and sound pressure level for each 1 / 24 octave, (1) In the 1 / 24 octave band spectrum, a frame of 1 / 1 octave bands is set; (2) A reference level is calculated based on the energy sum of the sound pressure levels of each 1 / 24 octave component contained within the set frame; and (3) For each 1 / 24 octave component contained within the set frame, the value obtained by subtracting the reference level from the sound pressure level of that component is calculated as the peak level, and this is done while shifting the frame of the 1 / 1 octave band by 1 / 24 octaves, A program that functions as a means for calculating the score of each of the 1 / 24 octave components based on the prominence level of each of the 1 / 24 octave components calculated within each of the frames of the 1 / 1 octave band.

9. A device for evaluating the operating noise of rotating machinery, A means for performing 1 / 24 octave band analysis on the operating noise of the aforementioned rotating machine and generating a 1 / 24 octave band spectrum showing the relationship between frequency and sound pressure level for each 1 / 24 octave, (1) In the 1 / 24 octave band spectrum, a frame based on the critical bandwidth is set; (2) A reference level is calculated based on the energy sum of the sound pressure levels of each 1 / 24 octave component included in the set frame; and (3) For each 1 / 24 octave component included in the set frame, the value obtained by subtracting the reference level from the sound pressure level of that component is calculated as the peak level, and this is done while shifting the frame based on the critical bandwidth by 1 / 24 octaves at a time. An apparatus comprising: means for calculating the score of each of the 1 / 24 octave components based on the protrusion level for each of the 1 / 24 octave components calculated in each of the frames based on the critical bandwidth.

10. A program for evaluating the operating noise of rotating machinery, using a computer, A means for performing 1 / 24 octave band analysis on the operating noise of the aforementioned rotating machine and generating a 1 / 24 octave band spectrum showing the relationship between frequency and sound pressure level for each 1 / 24 octave, (1) In the 1 / 24 octave band spectrum, a frame based on the critical bandwidth is set; (2) A reference level is calculated based on the energy sum of the sound pressure levels of each 1 / 24 octave component included in the set frame; and (3) For each 1 / 24 octave component included in the set frame, the value obtained by subtracting the reference level from the sound pressure level of that component is calculated as the peak level, and this is done while shifting the frame based on the critical bandwidth by 1 / 24 octaves at a time. A program that functions as a means for calculating the score of each of the 1 / 24 octave components based on the prominence level of each of the 1 / 24 octave components calculated in each of the frames based on the critical bandwidth.

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