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Abnormal noise detection system

A detection system and abnormal sound technology, which is applied in the direction of measuring vibration, measuring device, vibration measurement in fluid, etc., can solve the problem that the search takes a long time, etc.

Active Publication Date: 2015-02-25
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since only partial pruning is used, there is a disadvantage that it takes a long time to search for a huge accumulated signal.

Method used

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Embodiment Construction

[0034] Embodiments of the present invention are described with reference to the drawings. In addition, in each figure, the same code|symbol is attached|subjected to the same or similar component, and description is abbreviate|omitted.

[0035] figure 1 This is an example of a configuration diagram of an abnormal noise detection system. figure 2 is an example of hardware configuration. Such as figure 1 As shown, the abnormal sound detection system 1 has a cycle calculation unit 101, a zero point calculation unit 102, a zero point size calculation unit 103, a zero point density distribution calculation unit 104, an accumulated signal checking unit 105, a normal / abnormal diagnosis unit 106, and a zero point density database 107 . figure 1 The abnormal sound detection system 1 shown, with figure 2 The shown data processing unit H02 corresponds, and the processing is realized by, for example, a computer, a microcomputer, or the like. Additionally, display figure 1 The show...

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Abstract

The purpose of the present invention is to detect, among abnormal noises emitted from a device, abnormal noises in which changes in amplitude intensity (sound pressure) do not occur or are negligible, and abnormal noises in which a phase change occurs. This abnormal noise detection system, which diagnoses abnormalities in a device being diagnosed using sound data extracted from the device as an input signal, comprises: a zero point magnitude calculation unit that calculates zero point magnitudes of the sound data for one cycle of the input signal; a zero point density distribution calculation unit that calculates a zero point density distribution from the zero point magnitudes; and a normal / abnormal diagnosis unit that determines whether the device being diagnosed is normal or abnormal by comparing the zero point density distribution of the input signal with the zero point density distribution of normal sound data.

Description

technical field [0001] The invention relates to an abnormal sound detection system. Background technique [0002] As a background art of this technical field, in order to maintain the operation rate of a facility, the diagnosis of a facility is important. When diagnosing a device, as a countermeasure against the fact that it is difficult to attach a sensor to a site to be diagnosed, attention has been paid to audio-based diagnosis that does not require touching the site to be diagnosed. Therefore, conventionally, diagnosis using sound has been employed. [0003] Patent Document 1 describes "an acoustic diagnosis support device that supports the diagnosis of a sound source that generates abnormal noise at a predetermined cycle when an abnormality occurs" and "makes it easy to grasp the abnormality". It is described as follows: For this purpose, "the sound collector records the measurement data obtained by sampling the sound generated from the rotating machine at a given fre...

Claims

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Application Information

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IPC IPC(8): G01H3/00G01M99/00
CPCG01M7/00G01H3/00
Inventor 峰村今朝汤田晋也佐伯崇
Owner HITACHI LTD
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