JP2018009970A - Diagnostic device, diagnostic system, diagnostic method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diagnostic device, a diagnostic system, a diagnostic method and a program, capable of identifying a discontinuous part included in a target signal being a recording signal serving as an analysis object.SOLUTION: A diagnostic device includes: a first acquisition part configured to acquire a target signal detected at a detection part configured to detect a target signal outputted by a drive part of a diagnostic object machine; a second acquisition part configured to acquire a reference signal generated by a signal generator; a discontinuity detection part configured to detect whether or not there is a discontinuous part in the reference signal acquired by the second acquisition part; and a specification part configured to identify, if the discontinuity detection part detects that there is a discontinuous part in the reference signal, a waveform part of the target signal corresponding to the discontinuous part of the reference signal, as the discontinuous part.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a diagnostic device, a diagnostic system, a diagnostic method, and a program.

  In a diagnostic system that records the sound generated by the machine and performs frequency analysis etc. on the recorded sound, diagnosing the presence or absence of defects such as defects due to aging of parts in the machine. (Discontinuous part) may occur. In addition, the gain adjustment for the recorded sound in the diagnostic system may not be appropriate, and the waveform data of the recorded sound may overflow, or the recording level may be too low to be used as waveform data for analysis.

  As described above, as a system for diagnosing the presence / absence of abnormality of the machine from the waveform data, the signal output from the vibration detecting means for detecting the vibration of the rotator for the purpose of diagnosing the presence / absence of the abnormality of the rotator provided in the machine. A system is disclosed in which an abnormality diagnosis is performed by excluding a region where the influence of noise is large (see Patent Document 1).

  If the waveform data of the recorded sound is discontinuous for some reason or if the recorded waveform data overflows, a frequency component that should not have been included in the frequency analysis of the recorded sound is detected. It can't be analyzed correctly. However, since the waveform of the recorded sound has an irregular shape, it is difficult to determine whether there is no discontinuous portion and the recording is properly performed.

  However, in the technique described in Patent Document 1, if there is a discontinuous portion in the vibration signal corresponding to the waveform data of the recorded sound described above, the analysis result is affected as an error. The problem that it is difficult to determine the presence or absence of a part has not been solved.

  The present invention has been made in view of the above-described problems, and provides a diagnostic device, a diagnostic system, a diagnostic method, and a program capable of specifying a discontinuous portion included in a target signal that is a recorded signal to be analyzed. The purpose is to do.

  In order to solve the above-described problems and achieve the object, the present invention provides a first acquisition unit that acquires a target signal detected by a detection unit that detects a target signal emitted by a drive unit of a diagnosis target machine, and a signal generator A second acquisition unit that acquires a reference signal generated from the reference signal, a discontinuity detection unit that detects whether the reference signal acquired by the second acquisition unit includes a discontinuous portion, When it is detected that there is a discontinuous portion, a specifying unit is provided that specifies a waveform portion of the target signal corresponding to the discontinuous portion of the reference signal as a discontinuous portion.

  According to the present invention, it is possible to specify a discontinuous portion included in a target signal that is a recorded signal to be analyzed.

FIG. 1 is a schematic diagram illustrating an example of the overall configuration of a diagnostic system according to an embodiment. FIG. 2 is a diagram illustrating an example of a hardware configuration of the diagnostic apparatus according to the embodiment. FIG. 3 is a diagram illustrating an outline of a hardware configuration of the processing machine according to the embodiment. FIG. 4 is a diagram illustrating an example of a functional block configuration of the diagnostic system according to the embodiment. FIG. 5 is a diagram illustrating an example of the waveform data of the target sound and the waveform data of the reference sound. FIG. 6 is a diagram illustrating an example when the waveform data is discontinuous. FIG. 7 is a flowchart illustrating an example of the discontinuous portion specifying operation for the target sound of the diagnostic system according to the embodiment. FIG. 8A is a diagram illustrating an example of waveform data of a reference sound that is a sine wave and a spectrogram thereof. FIG. 8-2 is a diagram illustrating an example of waveform data and a spectrogram when the discontinuous portion is included in the reference sound that is a sine wave. FIG. 9 is a diagram for explaining that waveform data including a discontinuous portion is excluded. FIG. 10 is a diagram for explaining gain adjustment for the waveform data of the reference sound. FIG. 11A is a diagram of an example of waveform data of a reference sound that is a sweep signal and a spectrogram thereof. FIG. 11B is a diagram illustrating an example of waveform data and a spectrogram when the reference sound that is the sweep signal includes a discontinuous portion. FIG. 12 is a diagram for explaining the waveform data obtained by binarizing the waveform data of the reference sound. FIG. 13A is a diagram for explaining the duty ratio when the waveform data of the reference sound includes a discontinuous portion. FIG. 13B is a diagram for explaining the duty ratio when the waveform data of the reference sound includes a discontinuous portion. FIG. 14 is a diagram illustrating an example of the waveform data of the reference sound when the waveform data becomes discontinuous due to omission. FIG. 15 is a diagram illustrating an example of waveform data and a spectrogram when the reference sound that is a sine wave includes a discontinuous portion due to missing data. FIG. 16 is a diagram illustrating an example of the waveform data of the reference sound when the waveform data becomes discontinuous due to fluctuations in the sampling frequency. FIG. 17 is a diagram illustrating an example of waveform data and a spectrogram thereof in the case where a discontinuous portion is included in the reference sound that is a sine wave due to a variation in the sampling frequency. FIG. 18 is a diagram illustrating an example of waveform data and a spectrogram thereof in the case where a discontinuous portion is included in the reference sound that is a sine wave due to fluctuations in which the sampling frequency is lowered. FIG. 19 is a diagram for explaining the duty ratio in the case where the waveform data of the reference sound includes a discontinuous portion due to the variation of the sampling frequency.

  Hereinafter, embodiments of a diagnostic apparatus, a diagnostic system, a diagnostic method, and a program according to the present invention will be described in detail with reference to the drawings. In addition, the present invention is not limited by the following embodiments, and constituent elements in the following embodiments are easily conceivable by those skilled in the art, substantially the same, and so-called equivalent ranges. Is included. Furthermore, various omissions, substitutions, changes, and combinations of the constituent elements can be made without departing from the scope of the following embodiments.

(Overall configuration of diagnostic system)
FIG. 1 is a schematic diagram illustrating an example of the overall configuration of a diagnostic system according to an embodiment. The overall configuration of the diagnostic system 1 according to the present embodiment will be described with reference to FIG.

  The diagnostic system 1 shown in FIG. 1 records sounds generated by a machine (for example, a processing machine 10 described later), and performs frequency analysis or the like on the recorded sounds (target sound) (an example of a target signal). Is a system for diagnosing the presence or absence of an abnormality such as a defect due to a change over time of a component (for example, a rotating body such as a drill or a grindstone). As shown in FIG. 1, the diagnosis system 1 includes a sensor 11, an A / D converter 12, a diagnosis device 13, and a reference sound generator 14 (signal generation) installed in a processing machine 10 (an example of a diagnosis target machine). An example of an apparatus).

  The sensor 11 is a sensor that detects sound or vibration generated by a driving unit such as a rotary body such as a drill or a grindstone installed in the processing machine 10. The sensor 11 includes, for example, a microphone, an acceleration sensor, an AE (Acoustic Emission) sensor, or the like. Here, the sensor 11 is demonstrated as what detects the sound which the drive part of the processing machine 10 emits. The processing machine 10 is a machine tool that performs processing such as cutting, cutting, grinding, or polishing on a workpiece using a rotating body such as a drill or a grindstone.

  The A / D converter 12 is a device that converts an analog detection signal input from the sensor 11 and a reference sound analog signal input from the reference sound generator 14 into a digital signal. The analog detection signal output from the sensor 11 and the reference sound analog signal output from the reference sound generator 14 are input to separate channels of the A / D converter 12, respectively. Since each channel of the A / D converter 12 is sampled with the same clock, when a discontinuity described later occurs, a discontinuous portion is included in synchronization with the signal input to each channel. Will be. The A / D converter 12 outputs the converted digital signal to the diagnostic device 13.

  The diagnostic device 13 inputs the digital signal of the detection signal of the sensor 11 input from the A / D converter 12 and the digital signal of the reference sound of the reference sound generator 14 and performs frequency analysis on each digital signal. This is a device for diagnosing the presence or absence of an abnormality such as a defect due to a change with time of a part of the processing machine 10 by being performed. The diagnosis device 13 is an information processing device such as a PC (Personal Computer) or a workstation.

  The reference sound generator 14 is a device that generates a reference sound (an example of a reference signal) such as a sine wave.

  Although the diagnosis system 1 is provided with the A / D converter 12 independently, the diagnosis system 1 is not limited to this and may be replaced with an A / D conversion board that can be attached to the diagnosis device 13. Good.

(Hardware configuration of diagnostic device)
FIG. 2 is a diagram illustrating an example of a hardware configuration of the diagnostic apparatus according to the embodiment. The hardware configuration of the diagnostic apparatus 13 according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 2, the diagnostic device 13 includes a CPU (Central Processing Unit) 51, a ROM (Read Only Memory) 52, a RAM (Random Access Memory) 53, a communication I / F (Interface) 54, and an input. An output I / F 55, an input device 56, a display 57, an auxiliary storage device 58, and a speaker 59 are provided.

  The CPU 51 is an arithmetic device that controls the operation of the entire diagnostic device 13. The ROM 52 is a nonvolatile storage device that stores programs such as BIOS (Basic Input / Output System) and firmware for the diagnostic device 13. The RAM 53 is a volatile storage device used as a work area for the CPU 51.

  The communication I / F 54 is an interface for performing data communication with the A / D converter 12. The communication I / F 54 may be an interface for communicating with the processing machine 10.

  The input / output I / F 55 is an interface for connecting various devices (for example, the input device 56 and the display 57) and the bus 60.

  The input device 56 is an input device such as a mouse or a keyboard for performing operations such as inputting characters and numbers, selecting various instructions, and moving a cursor.

  The display 57 is a display device such as an LCD (Liquid Crystal Display), a plasma display, or an organic EL (Electro-Luminescence) display that displays various information such as a cursor, menu, window, characters, or images.

  The auxiliary storage device 58 is a storage device such as an OS (Operating System), application programs, and HDD (Hard Disk Drive) or SSD (Solid State Drive) that stores various data. The auxiliary storage device 58 is included in the diagnostic device 13, but is not limited thereto, and may be, for example, a storage device installed outside the diagnostic device 13, or the diagnostic device. 13 may be a storage device provided in a server device capable of data communication with the communication device 13.

  The speaker 59 is a device that outputs sound in accordance with the control of the CPU 51.

  The CPU 51, ROM 52, RAM 53, communication I / F 54, input / output I / F 55, auxiliary storage device 58, and speaker 59 are connected to each other via a bus 60 such as an address bus and a data bus.

(Outline of hardware configuration of processing machine)
FIG. 3 is a diagram illustrating an outline of a hardware configuration of the processing machine according to the embodiment. An outline of a hardware configuration of the processing machine 10 according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 3, the processing machine 10 includes a CPU 61, a ROM 62, a RAM 63, a communication I / F 64, a drive control circuit 65, a motor 66, and a sensor 67.

  The CPU 61 is an arithmetic device that controls the overall operation of the processing machine 10. The ROM 62 is a storage device that stores a program for the processing machine 10. The RAM 63 is a volatile storage device used as a work area for the CPU 61.

  The communication I / F 64 is an interface for communicating data via a network. The communication I / F 64 may be an interface for communicating with the diagnostic device 13.

  The drive control circuit 65 is a circuit that controls a drive unit such as the motor 66. The motor 66 is a motor that rotates a tool such as a drill or a grindstone at a high speed.

  The sensor 67 is a sensor that detects a physical quantity that changes according to the operation of the processing machine 10 and outputs detection information. The sensor 67 outputs the detected detection information to the A / D converter 12. The sensor 67 corresponds to, for example, the sensor 11 illustrated in FIG.

  The CPU 61, the ROM 62, the RAM 63, the communication I / F 64, and the drive control circuit 65 are connected to each other via a bus 68 such as an address and data bus so as to communicate with each other.

(Configuration and operation of functional block of diagnostic system)
FIG. 4 is a diagram illustrating an example of a functional block configuration of the diagnostic system according to the embodiment. FIG. 5 is a diagram illustrating an example of the waveform data of the target sound and the waveform data of the reference sound. FIG. 6 is a diagram illustrating an example when the waveform data is discontinuous. The configuration and operation of functional blocks of the diagnostic system 1 according to the present embodiment will be described with reference to FIGS.

  As shown in FIG. 4, the diagnostic system 1 includes a detection unit 111 attached to the processing machine 10, an A / D converter 12, a diagnostic device 13, and a reference sound generator 14.

  The processing machine 10 is a machine tool that is a diagnosis target of the diagnosis system 1. The processing machine 10 includes a numerical control unit 101, a communication control unit 102, a drive control unit 103, and a drive unit 104. In addition, as described above, the detection unit 111 is attached to the processing machine 10.

  The numerical control unit 101 is a functional unit that executes a processing operation (cutting, cutting, grinding, polishing, or the like) by the processing machine 10 by numerical control (NC: Numerical Control). For example, the numerical control unit 101 generates and outputs numerical control data for controlling the operation of the driving unit 104. The numerical control unit 101 is realized by, for example, a program that operates on the CPU 61 illustrated in FIG.

  The communication control unit 102 is a functional unit that controls communication with an external device such as the diagnostic device 13. For example, the communication control unit 102 transmits context information and the like corresponding to the current operation to the diagnostic device 13. The communication control unit 102 is realized by, for example, the communication I / F 64 illustrated in FIG.

  The drive control unit 103 is a functional unit that controls the drive of the drive unit 104 based on the numerical control data obtained by the numerical control unit 101. The drive control unit 103 is realized by, for example, the drive control circuit 65 illustrated in FIG.

  The drive unit 104 is a functional unit that is a target of drive control by the drive control unit 103. The drive unit 104 is an actuator and a tool that are driven and controlled by the drive control unit 103. For example, the drive unit 104 is realized by the motor 66 illustrated in FIG. 3 and a rotary body such as a drill or a grindstone that is rotationally driven by the motor 66. .

  The detection unit 111 is a functional unit that detects sound (target sound) generated by the drive unit 104 (for example, a rotary body such as a drill or a grindstone). For example, the detection unit 111 detects the target sound emitted by the drive unit 104 and outputs waveform data of the target sound as shown in FIG. The detection unit 111 is realized by, for example, the sensor 67 illustrated in FIG.

  The reference sound generator 14 has a generator 141.

  The generation unit 141 is a functional unit that generates a reference sound such as a sine wave. For example, the generating unit 141 generates a sine wave-shaped reference sound as shown in FIG.

  The A / D converter 12 includes a first conversion unit 121, a second conversion unit 122, and an adjustment unit 123.

  The first conversion unit 121 is a functional unit that receives an analog detection signal of the target sound detected by the detection unit 111, converts the detection signal into a digital signal, and outputs the digital signal. The second converter 122 is a functional unit that receives an analog signal of the reference sound generated by the reference sound generator 14, converts the analog signal into a digital signal, and outputs the digital signal.

  The adjustment unit 123 is a functional unit that performs gain adjustment on the analog signals input to the first conversion unit 121 and the second conversion unit 122.

  The diagnostic device 13 includes a communication control unit 131, a discontinuity detection unit 132, a specification unit 133, an exclusion unit 134, a storage unit 135, an analysis unit 136, a setting unit 137, and a notification unit 138. .

  The communication control unit 131 is a functional unit that controls data communication with the A / D converter 12. The communication control unit 131 is realized by, for example, the communication I / F 54 illustrated in FIG. The communication control unit 131 includes a first reception unit 131a (first acquisition unit), a second reception unit 131b (second acquisition unit), and a transmission unit 131c.

  The first receiving unit 131 a is a functional unit that receives the digital signal of the target sound converted by the first conversion unit 121 of the A / D converter 12. The second receiving unit 131 b is a functional unit that receives the digital signal of the reference sound converted by the second conversion unit 122 of the A / D converter 12. The transmission unit 131 c is a functional unit that transmits a control signal and the like to the A / D converter 12.

  The discontinuity detecting unit 132 is configured to detect a malfunction of the system (for example, simply referred to as “reference sound waveform data” hereinafter) based on the digital data of the reference sound received by the second receiving unit 131b. This is a functional unit that detects a discontinuous portion of a waveform that occurs due to a malfunction of the A / D converter 12 or the like. For example, as shown in FIG. 6B, the discontinuity detector 132 detects a discontinuous portion in the reference sound waveform portion 301 in the waveform data of the reference sound. The discontinuity detection unit 132 is realized by, for example, a program that operates on the CPU 51 illustrated in FIG.

  The identifying unit 133 is detected by the discontinuity detecting unit 132 in waveform data based on the digital signal of the target sound received by the first receiving unit 131a (hereinafter, sometimes simply referred to as “target sound waveform data”). This is a functional unit that identifies the waveform portion of the target sound corresponding to the discontinuous portion of the reference sound waveform as the discontinuous portion. For example, as illustrated in FIG. 6A, the specifying unit 133 specifies a discontinuous portion in the target sound waveform portion 302 in the target sound waveform data 301 corresponding to the reference sound waveform portion 301 in the reference sound waveform data. . The specifying unit 133 is realized by, for example, a program that operates on the CPU 51 illustrated in FIG.

  The excluding unit 134 is a functional unit that excludes the discontinuous portion specified by the specifying unit 133 from the waveform data of the target sound. The exclusion unit 134 is realized by, for example, a program that operates on the CPU 51 illustrated in FIG.

  The storage unit 135 is a functional unit that stores the waveform data of the target sound received by the first receiving unit 131a and the waveform data of the reference sound received by the second receiving unit 131b. The storage unit 135 is realized by, for example, the RAM 53 or the auxiliary storage device 58 illustrated in FIG.

  The analysis unit 136 is a functional unit that performs analysis using Fourier transform or the like on the remaining waveform data in which the discontinuous portion is excluded from the waveform data of the target sound by the exclusion unit 134. Based on this analysis result, the analysis unit 136 diagnoses the presence or absence of an abnormality such as a defect due to a change over time of the drive unit 104 of the processing machine 10. The analysis unit 136 is realized by, for example, a program that operates on the CPU 51 illustrated in FIG.

  The setting unit 137 is a functional unit that sets threshold values (set upper limit value and set lower limit value) for the waveform of the reference sound that is a sine wave received by the second receiving unit 131b. Details of this threshold will be described later with reference to FIG. The setting unit 137 is realized by, for example, a program that operates on the CPU 51 illustrated in FIG.

  The notification unit 138 is configured when the waveform data of the reference sound is out of the threshold range, that is, out of the range between the set lower limit value and the set upper limit value, with the gain adjustment by the adjusting unit 123 of the A / D converter 12. This is a functional unit that notifies the user to that effect. Note that the notification unit 138 may notify the fact when, for example, the detection of the discontinuous portion in the waveform data of the reference sound by the discontinuity detection unit 132 occurs more than a predetermined number of times within a predetermined time. . The notification unit 138 is realized by, for example, at least one of the display 57 and the speaker 59 illustrated in FIG. That is, the notification unit 138 may be notified by at least one of display on the display 57 and voice notification by the speaker 59.

  Note that some or all of the discontinuity detection unit 132, the identification unit 133, the exclusion unit 134, the analysis unit 136, and the setting unit 137 are realized by hardware circuits such as an IC (Integrated Circuit) instead of a program that is software. May be.

  Moreover, each function part of the processing machine 10, the A / D converter 12, the diagnostic device 13, and the reference sound generating device 14 shown in FIG. It is not limited to. For example, a plurality of functional units illustrated as independent functional units in FIG. 4 may be configured as one functional unit. On the other hand, the function of one functional unit in FIG. 4 may be divided into a plurality of functions and configured as a plurality of functional units.

(Specific operation of discontinuous part for target sound of diagnostic system)
FIG. 7 is a flowchart illustrating an example of the discontinuous portion specifying operation for the target sound of the diagnostic system according to the embodiment. FIG. 8A is a diagram illustrating an example of waveform data of a reference sound that is a sine wave and a spectrogram thereof. FIG. 8-2 is a diagram illustrating an example of waveform data and a spectrogram when the discontinuous portion is included in the reference sound that is a sine wave. FIG. 9 is a diagram for explaining that waveform data including a discontinuous portion is excluded. The specific operation of the discontinuous portion corresponding to the target sound of the diagnostic system 1 will be described with reference to FIGS.

<Step S11>
The first receiver 131a receives (records) the digital signal of the target sound converted by the first converter 121 of the A / D converter 12. The second receiver 131b receives (records) the digital signal of the reference sound converted by the second converter 122 of the A / D converter 12. The waveform data based on the digital signals recorded by the first receiving unit 131a and the second receiving unit 131b may be stored in the storage unit 135. Then, the process proceeds to step S12.

<Step S12>
The discontinuity detecting unit 132 detects the presence or absence of a discontinuous portion of the waveform that occurs due to a system failure in the waveform data of the reference sound received by the second receiving unit 131b. Specifically, the discontinuity detection unit 132 performs frequency analysis using Fourier transform or the like on the waveform data of the reference sound. The waveform shown in FIG. 8A shows the waveform (sine wave) of the reference sound in the normal state, and the result of frequency analysis performed on the waveform data of the reference sound is shown in FIG. It is a spectrogram with the horizontal axis shown representing time and the vertical axis representing frequency. As shown in the spectrogram of FIG. 8-1 (b), when the mixing of noise or the like is ignored, the waveform of the reference sound in the normal state is a sine wave including one frequency. It is constant at the frequency of the sine wave. On the other hand, the waveform shown in FIG. 8-2 (a) shows the waveform of the reference sound including the discontinuous portion in the discontinuous waveform portion 311. The result of frequency analysis of the waveform data of the reference sound is shown in FIG. -2 (b) is a spectrogram. As shown in the spectrogram of FIG. 8-2 (b), the waveform of the reference sound including the discontinuous portion includes a frequency component other than the frequency of the sine wave such as a high frequency component in addition to the frequency of the original sine wave. Therefore, as a result of the Fourier transform, there is a rising portion indicating a high-frequency component or the like in the time corresponding to the discontinuous portion of the waveform of the reference sound in FIG. As described above, when the discontinuity detection unit 132 determines that the frequency analysis of the reference sound waveform data includes frequency components other than the frequency of the sine wave, such as a high frequency component, the reference sound waveform data is discontinuous. Is detected.

  If a discontinuous portion is detected (step S12: Yes), the process proceeds to step S13. If not detected (step S12: No), the process proceeds to step S16.

<Step S13>
The specifying unit 133 sets the waveform portion of the target sound corresponding to the discontinuous portion of the waveform of the reference sound detected by the discontinuity detecting unit 132 in the waveform data of the target sound received by the first receiving unit 131a as a discontinuous portion. As specified. Then, the process proceeds to step S14.

<Step S14>
The excluding unit 134 excludes the discontinuous portion specified by the specifying unit 133 from the waveform data of the target sound. Specifically, for example, the waveform data of the target sound recorded by the first receiving unit 131a and the waveform data of the reference sound recorded by the second receiving unit 131b are stored as waveform data sets every predetermined time as a storage unit. It is assumed that one file is stored in 135 and managed as a waveform data set group 321 which is a set of files as shown in FIG. In the waveform data set (that is, the waveform data of the target sound and the waveform data of the reference sound) stored in the storage unit 135, the reference sound waveform data of the file of the nth waveform data set is discontinuous. It is assumed that the detection unit 132 detects that a discontinuous portion is included. In this case, as shown in FIG. 9, the excluding unit 134 excludes the waveform data set 322 that is a file (an example of a predetermined unit) of the nth waveform data set from the waveform data set group 321, and the waveform data set It is set as a group 321a.

  Here, excluding the discontinuous portion specified by the specifying unit 133 from the waveform data of the target sound means that the discontinuity detecting unit 132 discontinues the reference sound waveform data as shown in FIG. 9 described above. In addition to excluding the file itself that is detected to contain a part, it is a unit (an example of a predetermined unit) for applying a Fourier transform from the waveform data of the target sound of a file containing a discontinuous part. Including excluding a waveform portion corresponding to a unit to be included, and directly excluding a waveform portion corresponding to a discontinuous portion of the waveform data of the reference sound from the waveform data of the target sound of the file including the discontinuous portion. It is assumed to be a concept. Furthermore, the waveform data of the target sound including the discontinuous portion is analyzed using waveform data other than the waveform portion related to the discontinuous portion, and the waveform portion related to the discontinuous portion is not used for the analysis. Regardless of whether or not a continuous portion is included, the waveform data of the target sound in the waveform data set group 321 is analyzed by Fourier transform or the like, and among the analysis results, the waveform data of the target sound including the discontinuous portion is obtained. It is assumed that the concept also includes not using the analysis result.

  Then, the process proceeds to step S15.

<Step S15>
The analysis unit 136 uses the remaining waveform data in which the discontinuous portion is excluded from the waveform data of the target sound by the exclusion unit 134, that is, the waveform data other than the waveform data including the discontinuous portion of the waveform data of the target sound. Then, analysis using Fourier transform or the like is performed. Thus, the process ends.

<Step S16>
Since the discontinuity detection unit 132 does not detect a discontinuous portion in the waveform data of the reference sound, the analysis unit 136 performs analysis using Fourier transform or the like on the entire waveform data of the target sound. Thus, the process ends.

  Through the processes in steps S11 to S16 described above, the discontinuous portion specifying operation corresponding to the target sound of the diagnostic system 1 is performed.

(Gain adjustment)
FIG. 10 is a diagram for explaining gain adjustment for the waveform data of the reference sound. The gain adjustment for the target sound and the reference sound input to the A / D converter 12 will be described with reference to FIG.

  10A shows the waveform data of the target sound. However, since the waveform of the target sound has a complicated shape, it is not possible to detect it when an overflow occurs. Have difficulty. On the other hand, FIG. 10B shows a case where the waveform data of the reference sound has overflowed, but since the reference sound is a simple sine wave, it is easily confirmed visually that an overflow has occurred. can do. Alternatively, as described above with reference to FIG. 8B, when the discontinuity detection unit 132 performs frequency analysis on the waveform data of the reference sound and determines that the frequency component other than the frequency of the sine wave is included, It is detected that a discontinuous portion, that is, an overflow occurs in the sound waveform data.

  Further, as shown in FIG. 10C, if the adjusted gain is too low, the amplitude of the waveform data of the reference sound becomes small, and the analysis may not be performed normally. Thus, even when the amplitude of the waveform data of the reference sound is small, it can be easily confirmed visually.

  As described above, if the adjustment unit 123 causes the waveform data of the target sound to reflect the gain appropriately adjusted without overflow in the waveform data of the reference sound and without the amplitude being too small, With respect to the waveform data, it is possible to suppress the occurrence of overflow and the occurrence of analysis failure due to the amplitude being too small.

  In addition, in order to appropriately adjust the gain of the reference sound by the adjusting unit 123, for example, as shown in FIGS. 10C and 10D, the peak of the reference sound has a predetermined set lower limit value and set upper limit value. The gain adjustment may be performed so as to be within the range. In this case, a setting lower limit value and a setting upper limit value for the waveform data of the reference sound that is a sine wave may be set in advance by the setting unit 137. In addition, the notification unit 138 detects whether or not the peak of the waveform data of the reference sound is between the set lower limit value and the set upper limit value. If the peak is below the set lower limit value, the notifying unit 111 (sensor 11) or the like. What is necessary is just to notify a user that a connection failure or a gain is too low. Moreover, the notification part 138 should just notify a user that a gain is too high, when the peak of the waveform data of a reference | standard sound is more than a setting upper limit. Thereby, the workability of gain adjustment with respect to the reference sound by the user can be improved. FIG. 10C shows an example when the gain is too low, and FIG. 10D shows an example when the gain is appropriately adjusted.

  As described above, since the waveform of the target sound generated by the processing machine 10 has a complicated shape, even if a discontinuous portion is included due to an abnormality in the system, it cannot be easily identified. Frequency analysis of the sine wave), the discontinuous part in the waveform data of the reference sound can be detected, and by specifying the waveform part of the waveform data of the target sound corresponding to the discontinuous part in time, A discontinuous portion of waveform data can be easily identified. Also, when analyzing the waveform data of the target sound by applying some kind of filter or machine learning, if the frequency component other than the frequency component originally possessed by the target sound is included, the analysis result will be an error. As described above, the discontinuous portion of the waveform data of the target sound can be specified, so that this portion can be excluded and analyzed, and the analysis accuracy can be improved. .

  In addition, in order to diagnose the presence or absence of an abnormality such as a defect due to a temporal change of the drive unit 104, a learning model to be compared is generated using the recorded target sound, but the target sound itself for generating the learning model If a discontinuous part is included, an abnormal learning model is generated. When such an abnormal learning model is generated, it may be determined that the recorded target sound is abnormal although it is a normal sound that does not include abnormality. However, as described above, since the discontinuous portion of the waveform data of the target sound can be easily specified, it is possible to generate a normal learning model appropriately, and solve the above-described problems. be able to.

(Modification 1)
The diagnostic system according to the first modification of the present embodiment will be described focusing on differences from the diagnostic system 1 according to the present embodiment. In the above-described embodiment, the case where the reference sound generated by the generation unit 141 is a sine wave has been described. In this modification, a case where the reference sound generated by the generation unit 141 is a sweep sound will be described. Note that the overall configuration and functional block configuration of the diagnostic system according to the present modification, and the hardware configurations of the processing machine 10 and the diagnostic apparatus 13 are the same as those described in the above-described embodiment.

  FIG. 11A is a diagram of an example of waveform data of a reference sound that is a sweep signal and a spectrogram thereof. FIG. 11B is a diagram illustrating an example of waveform data and a spectrogram when the reference sound that is the sweep signal includes a discontinuous portion. With reference to FIGS. 11A and 11B, the operation for detecting the discontinuous portion when the sweep sound is used as the reference sound will be described.

  The generating unit 141 of the reference sound generator 14 generates a sweep sound as the reference sound. For example, as illustrated in FIG. 11A, the generation unit 141 generates a sweep signal whose frequency gradually increases. Note that the sweep signal is not limited to a signal whose frequency gradually increases as shown in FIG. 11A. For example, a signal whose frequency gradually decreases, and the frequency repeatedly increases and decreases. When the signal and frequency gradually increase and reach a predetermined size, it returns to the predetermined frequency, and then gradually increases again from there, or the frequency gradually decreases and decreases to the predetermined size. In some cases, the signal may be a signal that increases to a predetermined frequency and gradually decreases again.

  The second conversion unit 122 receives an analog sweep signal as a reference sound generated by the generation unit 141, converts the analog sweep signal into a digital signal, and outputs the digital signal. The second reception unit 131b receives (records) the digital signal of the reference sound converted by the second conversion unit 122.

  The discontinuity detector 132 detects the presence / absence of a discontinuous portion of the waveform generated due to a system failure in the waveform data of the reference sound (sweep signal) received by the second receiver 131b. Specifically, the discontinuity detection unit 132 performs frequency analysis using Fourier transform or the like on the waveform data of the reference sound. The waveform shown in FIG. 11-1 (a) shows the waveform (sweep signal) of the reference sound in the normal state, and the result of frequency analysis performed on the waveform data of the reference sound is shown in FIG. It is a spectrogram with the horizontal axis shown representing time and the vertical axis representing frequency. As shown in the spectrogram of FIG. 11-1 (b), when the mixing of noise or the like is ignored, the frequency of the vertical axis gradually increases because the waveform of the reference sound at normal time is a waveform whose frequency gradually increases. On the other hand, the waveform shown in FIG. 11-2 (a) shows the waveform of the reference sound including the discontinuous portion in the discontinuous waveform portion 331, and the result of frequency analysis performed on the waveform data of the reference sound is shown in FIG. -2 (b) is a spectrogram. As shown in the spectrogram of FIG. 11-2 (b), the waveform of the reference sound including the discontinuous portion is a frequency other than the frequency included in the reference sound such as a high frequency component in addition to the frequency included in the reference sound that is the original sweep signal. Since the frequency component is included, as a result of the Fourier transform, a rising portion indicating a high-frequency component or the like exists at a time corresponding to the discontinuous portion of the waveform of the reference sound in FIG. As described above, when the discontinuity detecting unit 132 determines that the frequency analysis of the reference sound waveform data includes a frequency component other than the frequency included in the reference sound, such as a high frequency component, the reference sound waveform data is discontinuous. Detect that part is included.

  The operation of the functional unit of the other diagnostic system 1 is the same as the operation described in the above embodiment.

  As described above, in this modified example, the sweep signal is used as the reference sound used for specifying the discontinuous portion included in the target sound. For example, in the above-described embodiment, the case where a sine wave is used as a reference sound has been described. In the case of missing, the shape of the sine wave may be the same as the shape before the missing. In such a case, the discontinuity portion of the reference sound cannot be detected by the discontinuity detecting unit 132, and the waveform data of the target sound includes the discontinuous portion, but it is not specified and is analyzed. There is a possibility of being used. However, when the sweep signal is used as the reference sound, the frequency constantly fluctuates, so that any part of the waveform is lost, as shown in FIG. 11-2 (b), as a result of frequency analysis. There is an advantage that it can be detected as occurrence of a discontinuous portion.

(Modification 2)
The diagnostic system according to the second modification of the present embodiment will be described focusing on differences from the diagnostic system 1 according to the present embodiment. In the above-described embodiment, the operation has been described in which the waveform data of the reference sound which is a sine wave is directly subjected to frequency analysis to detect a discontinuous portion. In this modification, an operation of binarizing waveform data of a reference sound that is a sine wave and detecting a discontinuous portion using the duty ratio of the binarized waveform data will be described. Note that the overall configuration and functional block configuration of the diagnostic system according to the present modification, and the hardware configurations of the processing machine 10 and the diagnostic apparatus 13 are the same as those described in the above-described embodiment.

  FIG. 12 is a diagram for explaining the waveform data obtained by binarizing the waveform data of the reference sound. FIGS. 13A and 13B are diagrams illustrating the duty ratio when the waveform data of the reference sound includes a discontinuous portion. With reference to FIGS. 12, 13-1, and 13-2, the operation for detecting the discontinuous portion in the waveform data of the reference sound by the discontinuity detecting unit 132 will be described.

  The discontinuity detecting unit 132 binarizes the waveform data of the reference sound in order to detect the presence or absence of a discontinuous portion of the waveform caused by a system failure in the waveform data of the reference sound received by the second receiving unit 131b. Turn into. Specifically, the discontinuity detection unit 132 sets a section that is equal to or higher than a predetermined threshold in the waveform data of the sine wave reference sound illustrated in FIG. 12A to a “High” state and is lower than the predetermined threshold. By setting the section to the “Low” state, binarized rectangular waveform data (hereinafter, sometimes referred to as “rectangular waveform data”) is generated. Then, as shown in FIG. 12B, the discontinuity detecting unit 132 combines the period T0 (that is, the period of “High” and the period of “Low” of normal rectangular waveform data) that is the period of the sine wave. The duty ratio, which is a ratio of the “High” period H 0 of the normal rectangular waveform data to the normal rectangular waveform data, is obtained in advance as a normal duty ratio. Then, the discontinuity detection unit 132 sequentially obtains the duty ratio in the rectangular waveform data and compares it with the normal duty ratio. When the duty ratio different from the normal duty ratio is detected as a result of the comparison, the discontinuity detecting unit 132 includes a discontinuous portion in the waveform portion of the reference sound corresponding to the waveform portion having a different duty ratio in the rectangular waveform data. It is judged that

  In the case of the example illustrated in FIG. 13A, the discontinuity detecting unit 132, as illustrated in FIG. 13B, when the duty ratio is determined as (H1 / T1) in a specific portion of the rectangular waveform data, Since it is different from the normal duty ratio (H0 / T0), it is discontinuous in the waveform portion of the reference sound shown in FIG. 13A corresponding to the waveform portion of the rectangular waveform data whose duty ratio is (H1 / T1). Detect that there is a part. In the case of the example illustrated in FIG. 13B, the discontinuity detection unit 132 has obtained the duty ratio (H0 / T2) at a specific portion of the rectangular waveform data as illustrated in FIG. 13B. In this case, since it is different from the normal duty ratio (H0 / T0), the waveform portion of the reference sound shown in FIG. 13-2 (a) corresponding to the waveform portion of the rectangular waveform data whose duty ratio is (H0 / T2). Detect the presence of discontinuities.

  The operation of the functional unit of the other diagnostic system 1 is the same as the operation described in the above embodiment.

  As described above, in this modification, the waveform data of the reference sound that is a sine wave is binarized, the duty ratio of the binarized rectangular waveform data is obtained, and the duty ratio is different from the normal duty ratio. It is determined that there is a continuous part. In this way, as described in the above embodiment, binarization processing is performed on the waveform data of the reference sound that is a sine wave without performing heavy frequency analysis, and the duty ratio is not used. Since the continuous portion is detected, it is possible to reduce the load of the discontinuous portion detection process for the waveform data of the reference sound.

(Modification 3)
The diagnostic system according to the third modification of the present embodiment will be described focusing on differences from the diagnostic system 1 according to the present embodiment. In this modification, a mode for inspecting a failure (particularly, the A / D converter 12) of the diagnostic system 1 will be described. Note that the overall configuration and functional block configuration of the diagnostic system according to the present modification, and the hardware configurations of the processing machine 10 and the diagnostic apparatus 13 are the same as those described in the above-described embodiment.

  As described in the above embodiment, the diagnostic system 1 identifies the discontinuous portion of the waveform data of the target sound generated from the processing machine 10 by detecting the discontinuous portion of the waveform data of the reference sound, By analyzing the waveform data of the target sound other than the identified discontinuous portion, the presence or absence of an abnormality such as a defect due to a change with time of the drive unit 104 is diagnosed. However, depending on the state of occurrence of the discontinuous portion with respect to the waveform data of the reference sound, there is a possibility that a problem such as a malfunction of the diagnostic system 1 itself, particularly a malfunction of the A / D converter 12 has occurred. Therefore, the detection mode may be set so that the detection unit 111 does not record the target sound from the processing machine 10 and inspects the malfunction of the diagnostic system 1 itself.

  Specifically, based on the detection of the discontinuous portion of the waveform data of the reference sound by the discontinuity detecting unit 132 described in the above-described embodiment, the presence / absence of a defect in the diagnostic system 1 itself may be determined. . For example, when the discontinuity detection unit 132 detects a discontinuous portion a predetermined number of times in a predetermined period, the notification unit 138 notifies the contents that the diagnosis system 1 itself may have a problem. do it. By making it possible to set the inspection mode in this way, it is possible to find a problem in the diagnostic system 1 itself.

(Modification 4)
A diagnostic system according to the fourth modification of the present embodiment will be described focusing on differences from the diagnostic system 1 according to the present embodiment. In the above-described embodiment, the operation of specifying the discontinuous portion of the waveform data of the target sound when the discontinuous portion occurs in the waveform data of the reference sound due to a malfunction of the system has been described. In the present modification, a case will be described in which this discontinuous portion is caused in particular by a lack of reference waveform data. Note that the overall configuration and functional block configuration of the diagnostic system according to the present modification, and the hardware configurations of the processing machine 10 and the diagnostic apparatus 13 are the same as those described in the above-described embodiment.

  FIG. 14 is a diagram illustrating an example of the waveform data of the reference sound when the waveform data becomes discontinuous due to omission. The reference sound waveform portion 341 in the waveform data of the reference sound shown in FIG. 14 is in a state in which a malfunction of the system, particularly, a data input operation by the A / D converter 12 occurs, and a discontinuous portion occurs due to data loss. An example is shown. When a problem occurs in the data input operation by the A / D converter 12, as shown in FIG. 14, the value of the reference sound is detected as a constant value during the period of the reference sound waveform portion 341 (detected as if the value has increased). Or the value of the reference sound may be detected as ± 0 due to the temporary inability of the input operation itself. Even in such a case, the discontinuity detection unit 132 detects the discontinuity in the waveform data of the reference sound.

  FIG. 15 is a diagram illustrating an example of waveform data and a spectrogram when the reference sound that is a sine wave includes a discontinuous portion due to missing data. The waveform shown in FIG. 15A shows the waveform of the reference sound including the discontinuous portion generated due to the above-mentioned missing data in the discontinuous waveform portion 351, and the frequency analysis was performed on the reference waveform data. The result is a spectrogram shown in FIG. As shown in the spectrogram of FIG. 15B, the waveform of the reference sound including the discontinuous portion includes frequency components other than the sine wave frequency such as a high frequency component in addition to the original sine wave frequency. As a result of the Fourier transform, a rising portion indicating a high-frequency component or the like exists at a time corresponding to the discontinuous portion of the waveform of the reference sound in FIG. As described above, when the discontinuity detection unit 132 determines that the frequency analysis of the reference sound waveform data includes frequency components other than the frequency of the sine wave, such as a high frequency component, the reference sound waveform data is discontinuous. Is detected.

  As described above, by analyzing the frequency of the reference sound (sine wave), for example, even when a discontinuous portion is generated due to data loss due to a malfunction of the A / D converter 12, the discontinuous portion can be detected. By specifying the waveform portion of the waveform data of the target sound that temporally corresponds to the discontinuous portion, the discontinuous portion of the waveform data of the target sound can be easily specified.

  In addition to detecting the discontinuous portion of the waveform data of the reference sound as in the present modification example, the waveform data of the reference sound is binarized and binarized as in the second modification example described above. It is also possible to detect a discontinuous portion using the duty ratio of the waveform data.

(Modification 5)
A diagnostic system according to the fifth modification of the present embodiment will be described focusing on differences from the diagnostic system 1 according to the present embodiment. In the above-described embodiment, the operation of specifying the discontinuous portion of the waveform data of the target sound when the discontinuous portion occurs in the waveform data of the reference sound due to a malfunction of the system has been described. In the present modification, a case will be described in which this discontinuous portion is caused in particular by fluctuations in the sampling frequency of the A / D converter 12. Note that the overall configuration and functional block configuration of the diagnostic system according to the present modification, and the hardware configurations of the processing machine 10 and the diagnostic apparatus 13 are the same as those described in the above-described embodiment.

  FIG. 16 is a diagram illustrating an example of the waveform data of the reference sound when the waveform data becomes discontinuous due to fluctuations in the sampling frequency. A reference sound waveform portion 361 in the waveform data of the reference sound shown in FIG. 16A shows an example of a state in which a discontinuous portion is generated due to a malfunction of the system, in particular, a fluctuation in which the sampling frequency in the A / D converter 12 increases. ing. A reference sound waveform portion 362 in the waveform data of the reference sound shown in FIG. 16B shows an example of a state in which a discontinuous portion is generated due to a malfunction of the system, in particular, a fluctuation in which the sampling frequency in the A / D converter 12 is lowered. ing. As in the example shown in FIG. 16, the waveform portion in which the frequency of the reference sound waveform fluctuates due to the fluctuation of the sampling frequency is also a portion of a different frequency that is not continuous with the normal frequency (base frequency) of the reference sound. It shall be included in the concept of data discontinuity. Even in such a case, the discontinuity detection unit 132 detects the discontinuity in the waveform data of the reference sound.

  FIG. 17 is a diagram illustrating an example of waveform data and a spectrogram thereof in the case where a discontinuous portion is included in the reference sound that is a sine wave due to a variation in the sampling frequency. The waveform shown in FIG. 17A shows the waveform of the reference sound including the discontinuous portion generated by the above-described fluctuation in which the sampling frequency is increased in the discontinuous waveform portion 371, and frequency analysis is performed on the reference waveform data. The result of performing is a spectrogram shown in FIG. As shown in the spectrogram of FIG. 17B, the waveform of the reference sound including the discontinuous portion is obtained from the normal frequency (base frequency) of the reference sound at the time corresponding to the discontinuous waveform portion 371 as a result of Fourier transform. Will also contain high frequency components.

  FIG. 18 is a diagram illustrating an example of waveform data and a spectrogram thereof in the case where a discontinuous portion is included in the reference sound that is a sine wave due to fluctuations in which the sampling frequency is lowered. The waveform shown in FIG. 18A shows the waveform of the reference sound including the discontinuous portion generated by the above-described fluctuation in which the sampling frequency is lowered in the discontinuous waveform portion 372, and frequency analysis is performed on the reference waveform data. The result of performing is a spectrogram shown in FIG. As shown in the spectrogram of FIG. 18B, the waveform of the reference sound including the discontinuous portion is obtained from the normal frequency (base frequency) of the reference sound at the time corresponding to the discontinuous waveform portion 372 as a result of Fourier transform. Will also contain low frequency components.

  As described above, when the discontinuity detecting unit 132 determines that a frequency component different from the base frequency of the reference sound is included as a result of the frequency analysis of the reference sound waveform data, the reference sound waveform data includes a discontinuous portion. Is detected. Further, the discontinuous portion may be detected using a duty ratio of binarized waveform data as shown in FIG.

  FIG. 19 is a diagram for explaining the duty ratio in the case where the waveform data of the reference sound includes a discontinuous portion due to the variation of the sampling frequency. As shown in FIG. 19, when a frequency component different from the base frequency of the reference sound is included due to the fluctuation of the sampling frequency as shown in FIG. 16 described above, the waveform data of the reference sound that is a sine wave is binarized, A discontinuous portion can be detected using the duty ratio of the digitized waveform data. Specifically, the discontinuity detecting unit 132 detects the presence or absence of a discontinuous portion of the waveform generated by the sampling frequency variation in the waveform data of the reference sound received by the second receiving unit 131b. Binary waveform data. In the waveform data of the sine wave reference sound shown in FIG. 19A, the discontinuity detection unit 132 sets a section that is equal to or higher than a predetermined threshold to “High”, and sets a section that is lower than the predetermined threshold to “Low”. In this state, binarized rectangular wave data is generated. Then, as shown in FIG. 19B, the discontinuity detection unit 132 combines the period T0 that is the cycle of the sine wave (that is, the “High” period and the “Low” period of normal rectangular waveform data). The duty ratio, which is a ratio of the “High” period H 0 of the normal rectangular waveform data to the normal rectangular waveform data, is obtained in advance as a normal duty ratio. Then, the discontinuity detection unit 132 sequentially obtains the duty ratio in the rectangular waveform data and compares it with the normal duty ratio. When the duty ratio different from the normal duty ratio is detected as a result of the comparison, the discontinuity detecting unit 132 includes a discontinuous portion in the waveform portion of the reference sound corresponding to the waveform portion having a different duty ratio in the rectangular waveform data. It is judged that

  In the case of the example shown in FIG. 19, the discontinuity detecting unit 132, when the duty ratio is determined as (H3 / T3) in a specific portion of the rectangular waveform data as shown in FIG. Since it is different from (H0 / T0), it is detected that there is a discontinuous portion in the waveform portion of the reference sound shown in FIG. 19 (a) corresponding to the waveform portion of the rectangular waveform data whose duty ratio is (H3 / T3). To do.

  As described above, by analyzing the frequency of the reference sound (sine wave), for example, even when a discontinuous portion occurs due to a change in the sampling frequency of the A / D converter 12, the discontinuous portion can be detected. By specifying the waveform portion of the waveform data of the target sound that temporally corresponds to the discontinuous portion, the discontinuous portion of the waveform data of the target sound can be easily specified. In this case, as shown in FIG. 19, the discontinuity detecting unit 132 can binarize the waveform data of the reference sound and detect the discontinuous portion using the duty ratio of the binarized waveform data. is there.

  In the above-described embodiment or each modification, the signal detected by the detection unit 111 is a sound (target sound), and the signal generated by the reference sound generator 14 is also a sound (reference sound). It is not limited, and other signals such as a vibration waveform may be used.

  Further, in the above-described embodiment, discontinuous portions caused by a system malfunction (such as a malfunction of the A / D converter 12) in the waveform data of the reference sound will be described. Further, in the fourth modification, the waveform data of the reference sound In the fifth modification, the discontinuous portion caused by fluctuations in the sampling frequency of the A / D converter 12 has been described. However, these do not specify the cause of the occurrence of the discontinuous portion of the waveform data of the reference sound. Even when the discontinuous portion is generated due to any factor, the discontinuous portion may be detected by the discontinuity detecting unit 132. It is possible, and the discontinuous part of the waveform data of the target sound can be easily specified.

  In the above-described embodiments and modifications, when at least one of the functional units of the diagnostic device 13 is realized by executing a program, the program is provided by being incorporated in a ROM or the like in advance. The program executed by the diagnostic device 13 according to the above-described embodiment and each modified example is a CD-ROM (Compact Disc Read Only Memory), a flexible disk (FD) in an installable or executable format file. ), A CD-R (Compact Disk Recordable), a DVD (Digital Versatile Disc), or the like. Further, the program executed by the diagnostic device 13 according to the above-described embodiment and each modified example is stored on a computer connected to a network such as the Internet and provided by being downloaded via the network. May be. Further, the program executed by the diagnostic device 13 according to the above-described embodiment and each modification may be configured to be provided or distributed via a network such as the Internet. In addition, the program executed by the diagnostic device 13 according to the above-described embodiment and each modification has a module configuration including at least one of the above-described functional units. By reading the program from the ROM 52 or the auxiliary storage device 58 and executing the program, the above-described functional units are loaded onto the main storage device (RAM 53 or the like) and generated.

DESCRIPTION OF SYMBOLS 1 Diagnostic system 10 Processing machine 11 Sensor 12 A / D converter 13 Diagnostic device 14 Reference sound generator 51 CPU
52 ROM
53 RAM
54 Communication I / F
55 I / O I / F
56 Input device 57 Display 58 Auxiliary storage device 59 Speaker 60 Bus 61 CPU
62 ROM
63 RAM
64 Communication I / F
65 drive control circuit 66 motor 67 sensor 68 bus 101 numerical control unit 102 communication control unit 103 drive control unit 104 drive unit 111 detection unit 121 first conversion unit 122 second conversion unit 123 adjustment unit 131 communication control unit 131a first reception unit 131b Second receiver 131c Transmitter 132 Discontinuity detector 133 Identification unit 134 Exclusion unit 135 Storage unit 136 Analysis unit 137 Setting unit 138 Notification unit 141 Generation unit 301 Reference sound waveform portion 302 Target sound waveform portion 311 Discontinuous waveform portion 321 , 321a Waveform data set group 322 Waveform data set 331 Discontinuous waveform portion 341 Reference sound waveform portion 351 Discontinuous waveform portion 361, 362 Reference sound waveform portion 371, 372 Discontinuous waveform portion

JP 2003-130724 A

Claims (14)

A first acquisition unit that acquires the target signal detected by a detection unit that detects a target signal emitted by the drive unit of the diagnosis target machine;
A second acquisition unit for acquiring a reference signal generated from the signal generator;
A discontinuity detection unit for detecting whether or not the reference signal acquired by the second acquisition unit has a discontinuous portion;
When the discontinuity detecting unit detects that there is a discontinuous portion in the reference signal, a specifying unit that identifies the waveform portion of the target signal corresponding to the discontinuous portion of the reference signal as a discontinuous portion;
Diagnostic device with   The diagnostic device according to claim 1, wherein the second acquisition unit acquires a sine wave signal as the reference signal generated from the signal generator.   The discontinuity detection unit binarizes the reference signal using a predetermined threshold, obtains a duty ratio of the binarized rectangular signal, and differs from a duty ratio corresponding to the case where the reference signal is normal The diagnostic apparatus according to claim 2, wherein a waveform portion of the reference signal corresponding to a duty ratio is detected as a discontinuous portion.   The diagnostic device according to claim 1, wherein the second acquisition unit acquires a sweep signal as the reference signal generated from the signal generator.   The discontinuity detection unit performs frequency analysis on the reference signal and detects that the reference signal includes a discontinuous portion when it is determined that the reference signal includes a frequency component other than the frequency of the normal reference signal. 2. The diagnostic device according to 2, or 4. An excluding unit that excludes a predetermined unit waveform portion including a discontinuous portion of the target signal specified by the specifying unit from the target signal;
An analysis unit that performs analysis on the remaining target signal from which the waveform unit of the predetermined unit is excluded by the exclusion unit;
The diagnostic device according to any one of claims 1 to 5, further comprising: An excluding unit that excludes a predetermined unit of a waveform portion including a discontinuous portion of the target signal identified by the identifying unit;
An analysis unit for performing analysis on the target signal other than the waveform portion of the predetermined unit excluded from the analysis target by the exclusion unit;
The diagnostic device according to any one of claims 1 to 5, further comprising: An analysis unit for analyzing the target signal acquired by the first acquisition unit;
Of the analysis results analyzed by the analysis unit, an exclusion unit that excludes the analysis result corresponding to the discontinuous portion of the target signal identified by the identification unit;
The diagnostic device according to any one of claims 1 to 5, further comprising:   The diagnostic device according to claim 1, further comprising a notification unit that notifies that the discontinuous portion in the target signal has been specified by the specifying unit. A setting unit for setting a threshold for determining whether or not the amplitude of the reference signal is included in a predetermined range;
When the amplitude of the reference signal is not included in the predetermined range based on the threshold set by the setting unit, a notification unit that notifies the fact,
The diagnostic device according to any one of claims 1 to 8, further comprising: The diagnostic device according to any one of claims 1 to 10,
The detection unit;
Diagnostic system with   The diagnostic system according to claim 11, further comprising the signal generator. A first acquisition step of acquiring the target signal detected by the detection unit that detects the target signal emitted by the drive unit of the diagnosis target machine;
A second acquisition step of acquiring a reference signal generated from the signal generator;
A detection step of detecting whether or not the acquired reference signal has a discontinuous portion;
If it is detected that there is a discontinuous portion in the reference signal, a specifying step of specifying the waveform portion of the target signal corresponding to the discontinuous portion of the reference signal as a discontinuous portion;
A diagnostic method comprising: Computer
A first acquisition unit that acquires the target signal detected by a detection unit that detects a target signal emitted by the drive unit of the diagnosis target machine;
A second acquisition unit for acquiring a reference signal generated from the signal generator;
A discontinuity detection unit for detecting whether or not the reference signal acquired by the second acquisition unit has a discontinuous portion;
When the discontinuity detecting unit detects that there is a discontinuous portion in the reference signal, a specifying unit that identifies the waveform portion of the target signal corresponding to the discontinuous portion of the reference signal as a discontinuous portion;
Program to make it function.

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