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Abnormal sound diagnosis device

A technology for diagnosing device and abnormal sound, which can be applied to measurement devices, electrical devices, instruments, etc., and can solve problems such as no diagnosis results.

Inactive Publication Date: 2012-12-05
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, since the area where the intensity of the time-frequency distribution is high is calculated upside down from the observation data, there is still a problem that the optimal diagnosis result cannot be guaranteed.

Method used

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Experimental program
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Embodiment approach 1

[0023] This embodiment is a device for diagnosing abnormal sound pressure emitted by equipment constituting the inspection target system. It is installed as software on a personal computer (hereinafter referred to as PC), and has a learning mode and an acquisition mode for acquiring normal waveforms. Enter the diagnostic mode of the waveform at the time of the test. When the measurer installs a microphone, a vibration sensor, etc. in the device to be inspected, and connects the microphone, vibration sensor, etc. to the input terminal of the USB (Universal Serial Bus: Universal Serial Bus) interface of the PC to perform the learning mode and the diagnosis mode operation.

[0024] As the system to be inspected, take the following situation as an example: for example, a microphone is installed in the car of an elevator, and the signal of the microphone is taken into a PC placed in the machine room through a control cable, and the car is reciprocated, so that Diagnose the operati...

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Abstract

The invention provided an abnormal sound diagnosis device. Time-frequency analysis of waveform data of the sound or vibration of an object device which is taken in by a waveform data acquisition unit is made by a time-frequency analyzing unit, the time-frequency distribution of the time axis and the frequency axis is determined, a plurality of regions specified by coordinate values of the time axis and the frequency axis of the time-frequency distribution are generated, regions containing variation components different from a stable state of the time-frequency distribution are extracted by a region extracting unit, and abnormality judgment and outputting are performed by a judging unit based on the time-frequency distribution contained in the extracted regions.

Description

technical field [0001] The present invention relates to a device for judging the possibility of abnormal sound of equipment in operation by time-frequency analysis of signals collected by a loudspeaker (hereinafter referred to as a microphone) and a vibration sensor. In particular, it relates to an abnormal sound diagnosis device for diagnosing various abnormal sounds generated during operation of a system composed of a plurality of devices. Background technique [0002] As the first technique related to the conventional abnormal noise diagnosis device for diagnosing abnormal noise, there is a technique of extracting the intensity of unstable vibration from the time-frequency distribution obtained by performing time-frequency analysis processing on the vibration data from the object to be judged. The technique of judging the possibility of occurrence of abnormal noise based on the extracted unstable vibration data based on the unsteady vibration data at a time above the set ...

Claims

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Application Information

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IPC IPC(8): G01M99/00G01H17/00
CPCG01H11/06
Inventor 阿部芳春
Owner MITSUBISHI ELECTRIC CORP
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