JP2011191181A - Abnormality diagnostic system of rotary apparatus, abnormality diagnostic device of the same, and abnormality diagnosis method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an abnormality diagnostic system of a rotating apparatus, an abnormality diagnostic device of the same, and an abnormality diagnosis method of the same, capable of detecting in the noncontact state, the noise emitted from the rotating apparatus in abnormality diagnosis of the rotating apparatus, and diagnosing accurately an abnormality of the rotary apparatus. <P>SOLUTION: Four speakers 8a-8d are installed on each center part of four sides of the outer periphery of an installation space 1, and the speakers 8a-8d output beacon signals set to have mutually different frequencies, as going toward the inner side of the installation space 1. A vibration sound emitted from the rotary apparatus 2a and the beacon signals are measured by the abnormality diagnostic device 9 at a measuring position. The measurement position is specified based on the beacon signals, and the sound pressure of the vibration sound measured at the measuring position is corrected to a sound pressure that is assumed as being acquired, if the sound pressure is measured at a reference position. Abnormality diagnosis of the rotating state of the rotary apparatus 2a is performed, on the basis of the effective value after the correction of the sound pressure . <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an abnormality diagnosis system, an abnormality diagnosis device, and an abnormality diagnosis method for diagnosing an abnormality of a rotating device during operation.

  It is generally known that a rotating device can diagnose whether there is an abnormality in the rotating device by measuring and analyzing vibration and noise of the rotating device main body during operation. For example, defective, damaged, or deteriorated bearings of rotating equipment can be detected by detecting characteristic frequencies. Further, it is possible to detect the insulation failure on the rotor side by detecting the “beat component” included in the noise of the rotating equipment.

  As a device for measuring and analyzing vibrations of a rotating device main body, a vibration sensor connected to the diagnostic device main body is directly attached to the rotating device, and the vibration sensor detects the vibration of the rotating device, and the rotating device in operation There is a diagnostic device for rotating equipment that diagnoses abnormalities (see, for example, Patent Document 1).

  The rotating device diagnosis apparatus described in Patent Document 1 diagnoses a bearing abnormality by directly attaching the vibration sensor to a bearing housing of the rotating device and measuring and analyzing vibration during operation of the rotating device. The vibration sensor must be attached to a rotating device to be diagnosed every time an abnormality diagnosis is made. For this reason, the mounting operation is troublesome, and a careful operation is required to avoid the hand from coming into contact with the rotating exposed portion.

JP 2004-279322 A

  On the other hand, in the method of measuring and analyzing the noise of the rotating rotating device main body during operation, it is possible to perform abnormality diagnosis without contacting the rotating device. When receiving noise emitted from a rotating device using a measuring instrument and making an abnormality diagnosis of the rotating device, it is difficult to keep the noise measurement position constant every time it is measured. The distance of is easy to fluctuate. Accordingly, since the signal level of the noise of the rotating device that receives the sound fluctuates, the reliability of the rotating device cannot be detected with high accuracy.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to detect a vibration state generated by a rotating device for abnormality diagnosis of the rotating device by vibro-acoustics and accurately perform abnormality diagnosis of the rotating device. An object of the present invention is to provide a device abnormality diagnosis system, a rotation device abnormality diagnosis device, and a rotation device abnormality diagnosis method.

  In order to achieve the above-described object, at least three rotating device abnormality diagnosis systems according to the present invention are arranged in the installation space of a rotating device to be diagnosed and output sound signals that are set at different frequencies. And an abnormality diagnosing device that is movably provided and diagnoses an abnormality in the rotational state of the rotating device, the abnormality diagnosing device being emitted from the vibration sound and the sound generator that are emitted during operation of the rotating device A sound receiver that receives the beacon sound and a signal level of the beacon sound that is output from at least three sound generators that are received by the sound receiver in the installation space of the sound receiver. A position specifying means for specifying a sound receiving position; and a signal level of the vibration sound received by the sound receiver based on the sound receiving position specified by the position specifying means. Correction means for correcting the signal level to be a signal level received at a reference position for diagnosing the rotation abnormality of the rotating device, and rotating abnormality of the rotating device based on the vibration acoustic signal corrected by the correction means. And diagnostic means for diagnosing (invention of claim 1).

  In order to achieve the above-described object, an abnormality diagnosis device for a rotating device according to the present invention is an abnormality diagnosis device used in the abnormality diagnosis system for a rotating device according to claim 1, and is used as the sound receiver. A microphone is configured to be connectable to the microphone, and includes a main body unit including the position specifying unit, the correcting unit, and the diagnostic unit (invention of claim 7).

  In order to achieve the above-mentioned object, the abnormality diagnosis method for a rotating device according to the present invention includes at least three sound generators that output beacon sounds set at different frequencies in the installation space of the rotating device to be diagnosed. The method for diagnosing abnormalities in the rotating device, wherein the receiving device receives the vibration sound emitted during operation of the rotating device and the marker sound emitted from the sound generator by the sound receiver. Based on the signal level of at least three beep sounds that have been sounded, the B step of identifying the sound receiving position by the sound receiver, and the signal level of the vibration sound received by the sound receiver are specified by the position specifying means C process for correcting the sound level to be the signal level when the sound is received at the reference position for diagnosing the rotation abnormality of the rotating device based on the received sound position, before the correction by the correcting means D step for diagnosing the abnormal rotation of the rotating equipment based on the vibration acoustic signal, a and performing in this order (the invention of claim 8).

  According to the above-described invention, it is possible to detect the vibration state generated by the rotating device in a non-contact manner by vibro-acoustics and to perform the abnormality diagnosis of the rotating device with high accuracy.

The figure which is a 1st Example of this invention and shows a mode that the abnormality diagnosis of a rotation equipment is performed by the abnormality diagnosis apparatus of a rotation equipment. Diagram showing an overview of an abnormality diagnosis device for rotating equipment Functional block diagram showing the electrical configuration of the rotating equipment abnormality diagnosis device Flow chart showing the procedure for abnormality diagnosis of rotating equipment Figure showing an example of a measured beacon signal A diagram showing an example of measured vibroacoustics Diagram of diagnostic data file Diagram for explaining correction of vibroacoustic signal FIG. 2 is a second embodiment of the present invention, corresponding to FIG. 3 equivalent figure 4 equivalent diagram The figure which shows the example which measured the vibration sound and the beacon signal simultaneously Equivalent to FIG.

(First embodiment)
A rotating device abnormality diagnosis system according to a first embodiment of the present invention will be described below with reference to FIGS. The abnormality diagnosis system for a rotating device receives speakers 8a to 8d installed in the installation space 1 and a beacon signal as a beacon sound emitted from the speakers 8a to 8d and receives vibration sound generated by the rotating device. And an abnormality diagnosis device 9 that performs correction, analysis, and diagnosis.

  As shown in FIG. 1, a plurality of (four in this embodiment) rotating devices 2 a to 2 d (for example, induction motors) are installed in a predetermined installation space 1 such as a factory. Cylindrical joining plates 6 and 7 are fixedly attached to the tip of the rotating shaft 3 of the rotating devices 2a to 2d and the tip of the rotating shaft 5 of the load device (for example, a pump) 4, and are joined. The plates 6 and 7 are joined to each other and fixed with bolts, whereby the rotating shaft 3 of the rotating devices 2a to 2d and the rotating shaft 5 of the load device 4 are mechanically connected. Speakers 8a to 8d, which are four sound generators, are installed at the central portions of the four sides of the outer periphery of the installation space 1, and these speakers 8a to 8d are different from each other toward the inside of the installation space 1. A beacon signal set to the frequency is output.

The measurement target of the vibration sound emitted from the rotating devices 2a to 2d is an audible frequency band up to 10 kHz, and the beacon signal emitted from the speakers 8a to 8d is 10 kHz to 20 kHz higher than the frequency band of the vibration sound measurement target. The frequency (f _a , f _b , f _c , f _d ) of the ultrasonic frequency band is set.

  A rotating device abnormality diagnosis device 9 shown in FIG. 2 measures and stores vibrational sound and sound pressure (Pa) of a beacon signal, and is a so-called PDA (Personal Digital) which is a portable information terminal device. Assistant) 10 is a main body, and a microphone 15, a pre-processor 14, a CF card 13, and a PDA 10 are connected in this order.

  An information display device such as an LCD (Liquid Crystal Display) is provided on the upper surface of the PDA 10, and a display input unit 11 configured to allow pen touch input, a push button type operation key 12, and the like are arranged. A card slot (not shown) for connecting the CF card 13 is formed at the upper end of the PDA 10.

  The microphone 15 is used to receive vibrational sound emitted from the rotating devices 2a to 2d and a beacon signal output from the speakers 8a to 8d, and can receive audible sound and sound in the ultrasonic frequency band. . When the CF card 13 is inserted into the card slot of the PDA 10, the microphone 15 is connected to the PDA 10, and the sound received by the microphone 15 is converted into an electric signal and input to the PDA 10.

Next, the electrical configuration of the abnormality diagnosis device 9 will be described with reference to FIG.
The pre-processor 14 filters an input signal from the microphone 15, and includes a jack 17, a DC component cut filter 18, a buffer 19, a changeover switch 20, a vibration acoustic filter 21 (second filter means), and a beacon signal. A filter 22 (first filter means) is provided. The DC component cut filter 18, the buffer 19 and the changeover switch 20 are connected in this order, and the DC component cut filter 18 is connected to the plug 16 of the microphone 15 via the jack 17. The changeover switch 20 is provided so that the input signal can be switched to either the vibration acoustic filter 21 or the beacon signal filter 22.

  The DC component cut filter 18 is a high-pass filter set to, for example, a cutoff frequency of 0.05 Hz and −20 dB / dec. The vibroacoustic filter 21 is configured by, for example, a secondary Butterworth low-pass filter set to a cutoff frequency of 10 kHz and −40 dB / dec, and allows a vibroacoustic signal in a frequency band of 0 Hz to 10 kHz to pass therethrough. The beacon signal filter 22 is composed of, for example, a secondary Butterworth high-pass filter with a cutoff frequency of 10 kHz and an antialiasing filter with a cutoff frequency of 20 kHz set to −40 dB / dec, and 10 kHz to 20 kHz of the input signal. A beacon signal set to a frequency in the frequency band is passed.

  The CF card 13 performs A / D conversion on the signal input from the preprocessor 14, and outputs the signal. The amplifier circuit 23, A / D converters 24 and 25, a CF card controller 26, a CPU 27, a memory 28, and a connector. 29.

  The A / D converter 24 is set to a sampling rate of 25 kHz necessary for sampling of the vibration acoustic frequency band, and the A / D converter 25 is set to a sampling rate of 50 kHz required for sampling of the frequency band of the beacon signal. Has been. The A / D converters 24 and 25 are connected in parallel between the amplifier circuit 23 and the CF card controller 26. Since the frequency band of vibroacoustics 0 Hz to 10 kHz is lower than the frequency band 10 kHz to 20 kHz of the beacon signal, the sampling rate of the A / D converter 24 is set lower than the sampling rate of the A / D converter 25.

  A CF card controller 26 and a memory 28 are connected to the CPU 27 via a bus. The CPU 27 controls the CF card controller 26 and the memory 28. The CF card controller 26 operates by decoding a control command given from the CPU 27 by an internal decoder (not shown), and transfers data between the CF card 13 and the PDA 10. The CF card controller 26 receives the data output from the A / D converters 24 and 25 and transfers the data to the PDA 10 side via the connector 29.

  The PDA 10 includes a connector 30, a CPU 31, a memory 32, an ISA bus I / F 33, a D / A converter 34, and a headphone jack 35. The ISA bus I / F 33 performs bus control with the CF card 13. An operating system (OS) is installed in the memory 32, and although not shown as an application program operating on the OS, a position specifying program (position specifying means), a vibration acoustic data correction program (correcting means), and an abnormality diagnosis A program (diagnostic means) is also stored.

  Note that a media player is mounted as the application program, and an audio signal can be reproduced and output based on a diagnostic data file 36 (see FIG. 7) described later. The audio signal is output from the headphone jack 35 via the D / A converter 34. That is, the operator can hear the vibration acoustic data as sound by connecting a headphone (not shown) to the headphone jack 35.

Next, the measurement of the beacon signal and the vibration sound according to the above configuration will be described.
First, in the measurement of the beacon signals of the speakers 8 a to 8 d, when the beacon signal measurement operation is performed by the PDA 10, the preprocessor 14 is switched to the beacon signal filter 22 side by the changeover switch 20, and the CF card 13 The sampling rate is switched to the A / D converter 25 side with 50 kHz. In this state, when the microphone 15 is directed to the speaker 8a (8b to 8d) to be measured, a beacon signal emitted from the speaker 8a (8b to 8d) is received by the microphone 15. The received beacon signal is passed through a beacon signal filter 22 in the preprocessor 14 and a signal in the frequency band of 10 kHz to 20 kHz, and thereafter converted into a digital signal by the A / D converter 25 in the CF card 13. , Input to the PDA 10. In the PDA 10, these beacon signals are stored in the memory 32 in the form described later as waveform data converted into digital signals.

Further, in the measurement of vibroacoustics of the rotary device 2a, when the operation of vibroacoustics is performed by the PDA 10, the preprocessor 14 switches to the vibroacoustic filter 21, and the CF card 13 has a sampling rate of 25 kHz. The A / D converter 24 is switched. In this state, when the microphone 15 is directed to the rotating device 2a that is a measurement target, vibration sound corresponding to the rotating state emitted from the rotating device 2a is received. The received vibration sound passes through a signal in a frequency band from 0.05 Hz to 10 kHz and is converted into a digital signal via the A / D converter 24. The vibration acoustic digital signal is stored in the memory 32 as waveform data in the PDA 10.
Note that each of the beacon signal and the vibration acoustic signal converted into a digital signal is a signal corresponding to sound pressure (Pa), and in the following description, the magnitude of this signal is treated as a signal level.

As described above, the beacon signal and the sound pressure of the vibroacoustic are measured. When the abnormality of the rotational state of the rotating device 2a is diagnosed, the sound pressure data of the vibroacoustic as a reference is acquired prior to this. . That is, when installing a rotating device 2a (2b to 2d as well) in the installation space 1, is obtained as reference data P ₀ data vibroacoustic sound pressure when being operated in a normal state. Vibro-acoustic measurement is performed in the same manner as described above, and the position A _{0 at} which the measurement is performed is performed at a predetermined position. Accordingly, the reference data P ₀ vibroacoustic as a reference measured at the reference position A ₀ is obtained.

Further, as the data necessary for calculating the position of in the installation space 1, the data signal level as a reference to the sound receiving at the reference position A ₀ beacon signal loudspeaker 8a~8d outputs B _a0, B _b0 , B _c0 and B _d0 are stored in advance together with the distance data to the speakers 8a to 8d. The vibration acoustic reference data P ₀ and the beacon signal data B _a0 , B _b0 , B _c0 , B _d0 are stored in advance in the memory of the PDA 10 as reference data for the rotating device 2 a. Similar data is measured in advance for the other rotating devices 2 b to 2 d and stored in the memory 32.

Next, measurement of abnormality diagnosis will be described with reference to the procedure of FIG.
In this embodiment, when a sound is received by the microphone 15, in order to enable measurement at any measurement position A ₁ other than the reference position A _{0 with} respect to the rotating device 2a described above, the measurement position is first detected. A beacon signal is received, thereby calculating a position A ₁ in the installation space 1 and determining a difference in distance from the reference position A ₀ . Thereafter, the vibration sound of the rotating device at the measurement position A ₁ is measured, and the signal level corresponding to the sound pressure is corrected to the signal level when it is received at the reference position A ₀ . Thereafter, it is determined whether or not the sound pressure p of vibro-acoustic sound corresponding to the signal received at the reference position A ₀ is at an abnormal level with respect to the reference data p ₀ .

As a procedure for abnormality diagnosis, first, the PDA 10 is operated to measure the beacon signal, the beacon signal filter 22 is set, and the A / D converter 25 is set so as to obtain the beacon signal rate ( S1). Next, a beacon signal is measured for the speakers 8a to 8c, for example, as at least three of the four speakers 8a to 8d by the microphone 15. In measurement, the microphone 15 receives sound for a predetermined time toward the speaker 8a (8b, 8c) to be measured (S2). Accordingly, digital signals of three beacon signals B _a , B _b , and B _c can be obtained.

  Next, the vibration sound of the rotating device 2a to be measured is measured. Similarly, the PDA 10 is operated to switch to the vibration acoustic filter 21 and the A / D converter 24 (S3). Subsequently, the microphone 15 is directed toward the rotating device 2a to receive vibrational sound. As a result, it is possible to acquire the vibration acoustic signal as data converted into a digital signal (S4).

Note that the beacon signal and vibrational sound data measured as described above are stored in the memory 32 as the diagnostic data file 36.
FIG. 7 shows the data area structure of the diagnostic data file 36. The diagnosis data file 36 has, for example, a data area structure including information chunks 37 and wave chunks 38 in the RIFF WAVE format, and is created for each abnormality diagnosis and stored in the memory 32 of the PDA 10.

The wave chunk 38 is a data area for recording audio data, and vibration acoustic data 39 and three beacon signal data 40, 41, and 42 are recorded therein. On the other hand, the information chunk 37 is an area for the user to record arbitrary data. For example, B _a0 , B _b0 , B _c0 , B _d0 are recorded in the sound pressure 43 of the beacon signal at the reference position, and the measurement is performed. For example, the sound pressures B _a , B _b , and B _c of the beacon signals of the speakers 8 a to 8 _c are recorded in the sound pressure 44 of the beacon signal at the position.

Next, the measurement position A ₁ is calculated from the digital signal data of the three measured beacon signals B _a , B _b and B _c (S5). Here, first, the frequency of the beacon signal is specified by performing FFT (Fast Fourier Transform) processing on the data of the three measured beacon signals, and the levels B _a1 , B _b1 , Each distance to each speaker 8a, 8b, 8c is calculated by calculating with B _c1 . Here, the speakers 8a at the reference position A _0, 8b, the distance to 8c La, Lb, using data of Lc, the sound pressure is calculated based on the rule that is inversely proportional to the square of the distance from the sound source be able to. The position of the measurement position A _{1 in} the installation space 1 can be calculated. Thus, it is possible to calculate the distance between the rotation device 2a of interest at the measurement position A _1.

Then, by operating the vibration data correction program described above, when any of the sound pressure of the frequency of the vibration noise measured at the measurement position A ₁ to the p _1, after correction for the measured in the reference position A ₀ The sound pressure p is obtained. Since the sound pressure is inversely proportional to the square of the distance from the sound source, the relationship between the sound pressure p ₁ and the sound pressure p can be expressed by the following equation (1).
p = (L ₁ / L ₀ ) ² × p ₁ (1)

According to the actual measurement results of the present inventors, the expression (1) is effective when the condition of (L ₁ / L ₀ ) ≧ 2 is satisfied, and (L ₁ / L ₀ ) <2. When the condition is satisfied, that is, when the distance between the measurement position A ₁ and the rotating device 2a as the sound source is close to the distance L ₀ from the reference position A ₀ , the following equation (2) may be effective. I know by measurement. This is presumed to be due to the reception of reflected sound due to the difference in sound transmission depending on the installation environment, and the sound pressure is inversely proportional to the distance from the sound source. For this reason, when (L ₁ / L ₀ ) <2, the sound pressure p ₁ is corrected to the sound pressure p at the reference position A ₀ using Equation (2).
p = (L ₁ / L ₀ ) × p ₁ (2)

That is, according to the formula (1) or (2), the sound pressure p ₁ measured at the measurement position A ₁ is corrected to the sound pressure p measured at the reference position A ₀ . The determination as to whether or not the rotational state of the rotating device 2a described below is abnormal is made based on the corrected sound pressure p. FIG. 8 shows the result of FFT processing on the data of the sound pressure p ₁ measured at the measurement position A ₁ . In FIG. 8, a curve 45 indicates a curve corresponding to the level of the sound pressure p ₁ measured at the measurement position A ₁ , and a curve 46 indicates a level of the corrected sound pressure p measured at the reference position A _0. A curve corresponding to is shown.

In the abnormality determination based on the effective value of the vibroacoustic data, the effective value is obtained from the frequency component of the corrected sound pressure p of the vibroacoustic sound measured at the reference position A ₀ and compared with a threshold value to be described later. It is determined whether or not the state is abnormal (S6). Specifically, the threshold value is set to, for example, a value that is five times the effective value of the vibration acoustic sound pressure p _{0 in} the initial state of the rotating device 2a. The effective value of the corrected sound pressure p of the vibroacoustic sound measured at the reference position A ₀ is compared with this threshold value to determine whether or not this effective value is smaller than the threshold value. When this effective value is smaller than the threshold value, it is determined that there is no abnormality in the rotation state of the rotating device 2a (S7: NO), and the abnormality diagnosis of the rotation state is ended. On the other hand, when it is determined that the effective value is greater than the threshold value, it is determined that the rotation state of the rotating device 2a is abnormal (S7: YES), and the process proceeds to step S8.

  In the vibroacoustic data analysis (S8), a well-known analysis based on (1) FFT, (2) symptom parameter, and (3) bearing path frequency is performed, and a more detailed abnormality diagnosis of the rotating state of the rotating device 2a is performed. In step S9, these diagnosis results are displayed on the display input unit 11 of the PDA 10.

  According to the above configuration, the abnormality diagnosis of the rotation state of the rotating device 2a can be performed only by measuring the vibration sound emitted from the rotating device 2a by the microphone 15 without contact. For this reason, there is no worry that the operator touches the rotation exposed portion of the rotating device 2a at the time of abnormality diagnosis, and the abnormality diagnosis can be performed safely and with good work efficiency.

Further, in order to correct the vibration and sound of the rotating device 2a measured at the measurement position A ₁ as the vibration and sound of the rotating device 2a measured at the reference position A ₀ , the vibration and sound of the rotating device 2a are measured by the variation in the measurement position. An error in sound pressure that is a signal level can be eliminated, and abnormality diagnosis can be performed with high accuracy.
Further, since the vibration acoustic sampling rate of the rotating device 2a is lower than the sampling rate of the beacon signal, the total number of data to be sampled can be reduced, and the capacity of the memory 32 of the abnormality diagnosis device 9 that stores the sampled data is reduced. This is economically advantageous.

(Second embodiment)
Hereinafter, an abnormality diagnosis system for a rotating device according to a second embodiment of the present invention will be described with reference to FIGS. 9 to 13. Parts that are substantially the same as those of the first embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and different points will be described.
The rotating device abnormality diagnosis system according to the present embodiment is the first embodiment in that each of the rotating devices 2a to 2d installed in the installation space 1 is provided with one speaker 51a to 51d that emits a beacon signal. This is different from the abnormality diagnosis system for rotating equipment.

  As shown in FIG. 9, a plurality of (four in this embodiment) rotating devices 2 a to 2 d are installed in the installation space 1. A speaker 51a is installed on the upper surface of the rotating device 2a. Similarly to the rotating device 2a, the rotating devices 2b to 2d are respectively provided with speakers 51b to 51d on their upper surfaces. The speakers 51a to 51d emit beacon signals set at different frequencies in the ultrasonic frequency band of 10 kHz to 20 kHz, respectively, toward the reference position.

Speaker 51a~51d each position specifying information in the beacon signal _{(frequency: e a, e b, e} c, e d), information for a rotary device identification _{(Frequency: e a1, e b1, e} c1, e d1) In addition, information for specifying the operation status (frequency: e _a2 , e _b2 , e _c2 , e _d2 ) and the like are superimposed. In the present embodiment, the operating status means the rotational speed of the rotating devices 2a to 2d. In the information for identifying the rotating device, a unique frequency (e _a1 , e _b1 , e _c1 , e _d1 ) is assigned to each rotating device 2a to 2d. For example, a beacon emitted from the speaker 51a If the signal of frequency e _a1 is superimposed on the signal, the rotating device 2a can be identified from the rotating devices 2a to 2d.

In the information for specifying the operating status of the rotating devices 2a to 2d, a unique frequency corresponding to the rotation speed of the rotating devices 2a to 2d is assigned. For example, the frequency e _a2 is assigned to the beacon signal emitted from the speaker 51a. If the above signal is superimposed, it can be seen that the rotational speed of the rotating device 2a at the time of measuring the beacon signal is a rotational speed corresponding to the frequency _ea2 .

  FIG. 10 is a functional block diagram showing the electrical configuration of the abnormality diagnosis device 52. As shown in FIG. The rotating device abnormality diagnosis device 52 includes a portable information portable device, a so-called PDA 10, as a main body, and a microphone 15, a preprocessor 54, a CF card 53, and a PDA 10 are connected in this order.

  The preprocessor 54 filters an input signal from the microphone 15 and is configured by connecting the jack 17, the DC component cut filter 18, the buffer 19, and the anti-aliasing filter 57 in series in this order. The anti-aliasing filter 57 is a filter having a cutoff frequency of 20 kHz set to −40 dB / dec, and is connected to the amplifier circuit 23 of the CF card 53.

  The CF card 53 A / D-converts and outputs an input signal from the pre-processor 54 and includes an amplifier circuit 23, an A / D converter 25, a CF card controller 26, a CPU 27, a memory 28, and a connector 29. ing. The signal input to the CF card 53 is amplified by the amplifier circuit 23, then supplied to the A / D converter 25 and converted into a digital signal.

  The A / D converter 25 is set to a sampling rate of 50 kHz necessary for sampling a vibration acoustic signal having a frequency band of 0 Hz to 10 kHz and a beacon signal having a frequency band of 10 kHz to 20 kHz, and converts the vibration acoustic signal and the beacon signal into a digital signal. To do. The A / D converter 25 is connected to the CF card controller 26. The CF card controller 26 receives the data output from the A / D converter 25 and transfers the data to the PDA 10 side via the connector 29.

Next, the measurement of the beacon signal and the vibration sound according to the above configuration will be described.
In this embodiment, the vibration sound of the rotating device 2a (2b to 2d) and the beacon signal of the speaker 8a (8b to 8d) are simultaneously measured. When the PDA 10 is operated to measure the vibration sound / beacon signal, the anti-aliasing filter 57 of the pre-processor 54 and the A / D converter 25 of the CF card 53 are activated. In this state, when the microphone 15 is directed to the rotating device 2a (2b to 2d) to be measured, the vibration sound corresponding to the rotating state emitted from the rotating device 2a (2b to 2d) and the speaker 8a ( The beacon signals emitted by 8b to 8d) are simultaneously received by the microphone 15.

  The received vibrational sound and beacon signal is passed through a signal in a frequency band of 0.05 Hz to 20 kHz by the anti-aliasing filter 57 in the pre-processor 54, and then digitalized by the A / D converter 25 in the CF card 53. It is converted into a signal and input to the PDA 10. In the PDA 10, the vibration acoustic signal and the beacon signal are stored in the memory 32 as waveform data converted into a digital signal.

As described above, the sound pressure of the vibration sound and the beacon signal is measured. In the abnormality diagnosis of the rotation state of the rotating device 2a, the acquisition of the sound pressure data of the vibration sound serving as a reference prior to this is described above. This is performed in the same manner as in the first embodiment. That is, the reference data P ₀ vibroacoustic of the rotating device 2a as a reference measured at the reference position A ₀ (2b to 2d) is obtained.

The reference data C localization information of each rotating devices 2a regard to beacon signal speakers 8a (8 b to 8 d) emitted provided corresponding to (2b to 2d), the beacon signal measured at the reference position A _{0 0} is acquired.

Next, measurement of abnormality diagnosis will be described with reference to the procedure of FIG.
Beacon In this embodiment, when the sound receiving by a microphone 15, which is also in order to enable the measurement, measured in the measurement position A ₁ in any of the measuring positions A ₁ other than the reference position A ₀ with respect to the rotation device 2a described above based on the sound pressure C ₁ and the reference data C ₀ localization information of the signal, when the signal level corresponding to the sound pressure of the vibration sound of the rotating device 2a as measured at a measurement position a ₁ and the sound receiving at the reference position a ₀ The signal level is corrected so that Thereafter, it is determined whether or not the sound pressure p of vibro-acoustic sound corresponding to the signal received at the reference position A ₀ is at an abnormal level with respect to the reference data p ₀ .

As a procedure for abnormality diagnosis, first, the PDA 10 is operated to simultaneously measure the vibrational sound and the beacon signal (S11). Next, the microphone 15 measures the vibration sound of the rotating device 2a and the beacon signal of the speaker 8a simultaneously. In the measurement, the microphone 15 receives sound for a predetermined time toward the rotating device 2a to be measured (S12). Thereby, it is possible to obtain a digital signal of the vibration sound p ₁ , the sound pressure C ₁ of the position specifying information of the beacon signal, the sound pressure of the information for identifying the rotating device, and the sound pressure of the information for specifying the driving situation.

Next, the vibration sound p ₁ obtained as a digital signal and the beacon signal are subjected to FFT processing to separate the vibration sound p ₁ in the frequency band of 0.05 Hz to 10 kHz and the beacon signal in the frequency band of 10 kHz to 20 kHz. (S14). The vibration sound and beacon signal data obtained as described above are stored in the memory 32 as the vibration data file 36.

In the vibroacoustic data correction, the sound pressure of the vibroacoustic separated in step S13 is corrected (S14). Specifically, the correction is performed so that the sound pressure of the vibroacoustic at the measurement position A ₁ becomes the sound pressure measured at the reference position A ₀ .

As described above, generally, since the sound pressure (Pa) is inversely proportional to the square of the distance from the sound source, the expression (1) is introduced.
p = (L ₁ / L ₀ ) ² × p ₁ (1)
Here, the relationship of the sound pressure distance attenuation of the position specifying information of the beacon signal is expressed by the following equation (3).
C ₀ = (L ₁ / L ₀ ) ² × C ₁ (3)
Equation (3) can be transformed into the following equation (4).
(L ₁ / L ₀ ) ² = C ₀ / C ₁ (4)
The following formula (5) is derived from the formulas (1) and (4).
p = (C ₀ / C ₁ ) × p ₁ (5)
Operating the vibration data correction program described above, if any of the sound pressure frequency vibroacoustic of the rotating device 2a measured at the measurement position A ₁ to the p _1, after correction for the measured in the reference position A ₀ The sound pressure p is obtained using equation (5).

Similar to the first embodiment, according to the actual measurement results of the present inventors, the expression (5) is effective when the condition of (C ₀ / C ₁ ) ≧ 2 ² = 4 is satisfied. , (C ₀ / C ₁ ) <4, that is, when the distance between the measurement position A ₁ and the rotating device 2a is close to the distance from the reference position A ₀ , the following formula (6 ) Is found to be effective by measurement. This is presumed to be due to the reception of reflected sound due to the difference in sound transmission depending on the installation environment, and the sound pressure is inversely proportional to the distance from the sound source. For this reason, when (C ₀ / C ₁ ) <4, the sound pressure p ₁ is corrected to the sound pressure p at the reference position A ₀ using Equation (6).
p = (C ₀ / C ₁ ) ^1/2 × p ₁ (6)

That is, the correction is performed by Equation (5) or (6) so that the sound pressure p measured at the reference position A ₀ is obtained based on the sound pressure p ₁ measured at the measurement position A ₁ . The diagnosis of the rotation abnormality of the rotating device 2a uses the corrected sound pressure p. FIG. 13 shows the result of FFT processing of the vibration sound and beacon signal data measured at the measurement position A ₁ . In FIG. 13, a curve 55 indicates a curve corresponding to the level of the sound pressure p ₁ measured at the measurement position A ₁ , and a curve 56 indicates a level of the corrected sound pressure p measured at the reference position A _0. A curve corresponding to is shown.

In the abnormality determination based on the effective value of the vibroacoustic data, the effective value is obtained from the frequency component of the corrected sound pressure p of the vibroacoustic sound measured at the reference position A ₀ and compared with a threshold value to be described later. It is determined whether or not the state is abnormal (S15). Specifically, the threshold value is set to a value five times the effective value of the sound pressure p ₀ of the vibroacoustic sound in the initial state of the rotating device 2a, which is performed by the above-described abnormality diagnosis program. The effective value of the corrected sound pressure p of the vibroacoustic sound measured at the reference position A ₀ is compared with this threshold value to determine whether or not this effective value is smaller than the threshold value. If this effective value is smaller than the threshold value, it is determined that there is no abnormality in the rotation state of the rotating device 2a (step S16: NO), and the abnormality diagnosis of the rotation state is terminated. On the other hand, when it is determined that the effective value is greater than the threshold value, it is determined that the rotation state of the rotating device 2a is abnormal (step S16: YES), and the process proceeds to step S17.

  In the vibroacoustic data analysis (step S17), a well-known analysis based on (1) FFT, (2) indication parameters, and (3) bearing path frequency is performed, and more detailed abnormality diagnosis of the rotating state of the rotating device 2a is performed. . In step S <b> 18, these diagnosis results are displayed on the display input unit 11 of the PDA 10.

  According to the above configuration, since both the vibration sound of the rotating device 2a and the beacon signal emitted from the speaker 51a are measured at the same time, the abnormality diagnosis of the rotating state of the rotating device 2a can be performed in a short time. Man-hours can also be reduced.

Further, since the abnormality diagnosis device 52 only measures one frequency band, it is sufficient to provide one filter for the pre-processor 54 and one A / D converter for the CF card 53, respectively. Can be easy.
Furthermore, in addition to the position specifying information, the information for identifying the rotating device and the information for specifying the operation status of the rotating device 2a are superimposed on the beacon signal. Therefore, monitoring of the rotating device 2a can be performed more efficiently.

(Other examples)
In addition, this invention is not limited to an above-described Example, It can implement suitably by changing in the range which does not deviate from the summary of this invention.
In the embodiment described above, it is assumed that the installation space 1 is indoors such as a factory. However, the present invention is not limited to this, and the present invention can also be applied to an installation space located outdoors.
Further, in the above embodiment, in the abnormality judgment by the effective value of the vibration sound data, although the threshold value is set to 5 times the value of the effective value of the sound pressure p ₀ vibroacoustic the initial state of the rotating device 2a, in which The threshold value is not limited, and the user can arbitrarily set the threshold value.

  Moreover, you may implement this invention combining the above-mentioned 1st Example and 2nd Example. That is, a plurality of rotating devices are installed in the installation space, and among them, a speaker that emits a beacon signal is installed in a specific rotating device, and at least three beacon signals are provided at the center of the outer periphery of the installation space. You may make it install the speaker which emits.

  Further, in the above-described embodiment, the law that the sound pressure is inversely proportional to the square of the distance from the sound source is based on the difference in how sound is transmitted depending on the installation environment and the like, and the sound pressure is inversely proportional to the first power of the distance from the sound source. However, if the actual value does not match because the multiplier sharply changes from “1st power” to “2nd power”, the multiplier between “1st power” and “2nd power” is stepwise or continuous. You may make it set to.

  In the drawings, 1 is an installation space, 2a to 2d are rotating devices, 8a to 8d are speakers (sound generators), 9 is an abnormality diagnosis device, 10 is a PDA (main body), 15 is a microphone (sound receiver), and 21 is Vibration acoustic filter (second filter means), 22 beacon signal filter (first filter means), 24 and 25 are A / D converters, 39 is vibration acoustic data (vibration sound), 40, 41, 42 is beacon signal data (sign sound), 51a to 51d are speakers (sound generators), 52 is an abnormality diagnosis device, and 57 is an anti-aliasing filter.

Claims (9)

A sound generator that outputs at least three beacon sounds set at different frequencies in the installation space of the rotating device to be diagnosed;
An abnormality diagnosing device that is movably provided and diagnoses an abnormality in the rotational state of the rotating device;
The abnormality diagnosis device includes:
A sound receiver that receives the vibration sound emitted during operation of the rotating device and the marker sound emitted from the sound generator;
Position specifying means for specifying a sound receiving position in the installation space of the sound receiver based on a signal level of the marker sound output from at least three sound generators received by the sound receiver;
A signal when the vibration acoustic signal level received by the sound receiver is received at a reference position for diagnosing rotation abnormality of the rotating device based on the sound receiving position specified by the position specifying means. Correction means for correcting the level,
Diagnosing means for diagnosing abnormal rotation of the rotating device based on the vibroacoustic signal corrected by the correcting means;
An abnormality diagnosis system for a rotating device, comprising:   2. The abnormality diagnosis system for a rotating device according to claim 1, wherein the marker sound is set to a frequency in a frequency band higher than a frequency band of the vibration sound emitted during operation of the rotating device. First filter means for extracting a signal in a frequency band of the beacon sound from a signal received by the receiver;
Second filter means for extracting a signal in the frequency band of the vibrational sound from a signal received by the sound receiver;
The position specifying means performs the position specifying process using the signal of the marker sound extracted by the first filter means from the signal received by the sound receiver,
The correction means uses the vibration acoustic signal extracted by the second filter means from the signal received by the sound receiver, based on the sound receiving position information specified by the position specifying means. The abnormality diagnosis system for a rotating device according to claim 2, wherein the signal level of vibroacoustics is corrected. An A / D converter for converting the signal of the beacon sound and the vibration sound extracted by the first and second filter means into a digital signal for diagnosis;
The A / D converter is
The beacon sound is sampled at a sampling rate necessary for sampling the beacon sound frequency band signal,
The abnormality diagnosis system for a rotating device according to claim 3, wherein the vibrational sound is sampled at a sampling rate lower than a sampling rate of the beacon sound. The signal of the beacon sound and the vibration sound received by the sound receiver is sampled at a sampling rate necessary for sampling the signal in the frequency band of the beacon sound and converted into a digital signal for diagnosis A / With a D converter,
The position specifying means extracts the beacon sound signal existing in the frequency band of the beacon sound from the digital signal obtained from the A / D converter, and uses the extracted beacon sound signal for the position. Do specific processing,
The correction means extracts the vibration acoustic signal existing in the vibration acoustic frequency band from the digital signal obtained from the A / D converter, and is based on the position specifying information specified by the position specifying means. The abnormality diagnosis system for a rotating device according to claim 2, wherein the vibration acoustic signal level is corrected. The distance from the rotating device to the sound receiving position is the sound receiving distance,
The distance from the rotating device to the reference position is a reference distance,
The correction means when the sound receiving distance is a predetermined distance not exceeding twice the reference distance,
Based on the measurement result in which the sound pressure as the signal level is inversely proportional to the distance from the sound source, the vibration acoustic signal that the sound level received at the sound receiving position is received at the reference position. The abnormality diagnosis system for a rotating device according to any one of claims 1, 3 and 5, wherein the level is corrected to a level.   The information for identifying the rotating device and the information for specifying the operating condition of the rotating device are superimposed on the beacon sound as a beacon sound having a different frequency. Rotating equipment abnormality diagnosis system. An abnormality diagnosis device used in the abnormality diagnosis system for a rotating device according to claim 1,
A microphone as the sound receiver;
The microphone is configured to be connectable, and a main body unit including the position specifying unit, the correcting unit, and the diagnostic unit;
An apparatus for diagnosing abnormalities in rotating equipment, comprising: In the installation space of the rotating device to be diagnosed, there are provided at least three sound generators that output beacon sounds set at different frequencies,
A method for diagnosing abnormality of the rotating device,
A process in which the sound receiving device receives the vibration sound generated during operation of the rotating device and the sign sound emitted from the sound generator;
B step of identifying the sound receiving position by the sound receiver based on the signal level of at least three marker sounds received by the sound receiver;
A signal when the vibration acoustic signal level received by the sound receiver is received at a reference position for diagnosing rotation abnormality of the rotating device based on the sound receiving position specified by the position specifying means. C process to correct to level
D process for diagnosing abnormal rotation of the rotating device based on the vibration acoustic signal corrected by the correcting means;
A method for diagnosing abnormalities in rotating equipment, wherein

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