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Diagnostic system of non-contact type rotary mechanical failure

A rotating machinery and non-contact technology, applied in the system field of detection technology, can solve problems such as not getting rid of contact measurement, and achieve the effect of strong generalization ability

Active Publication Date: 2011-01-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] After searching the existing literature, it is found that the Chinese patent application number is: 200810214410.0, and the name is "On-line Diagnosis Device and Method for Mechanical Equipment Faults". The device includes: microprocessor, liquid crystal display, digital signal processing chip, complex programmable logic Devices, high-speed signal analog-to-digital conversion chips, first-in-first-out memory, dynamic random access memory, etc., this paper collects vibration signals (temperature signals) of bearing housings and shafts, and diagnoses equipment failures according to the correlation dimension and shaft center trajectory, but the technology Acquisition of signals is limited to tactile measurements where sensors are easily placed
[0005] After searching, it was found that the Chinese patent application number is: 03135535.8, and the name is "Intelligent Diagnosis Method and Device for Rotating Machinery Faults". The fault diagnosis system is composed of four modules: decision fusion module, expert knowledge base, data engine module and intelligent reasoning engine to realize intelligent fault diagnosis of equipment. The disadvantages of measurement, and the intelligent diagnosis based on fuzzy neural network needs to be based on a large number of sample data

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  • Diagnostic system of non-contact type rotary mechanical failure

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Embodiment Construction

[0019] The system of the present invention is further described below: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0020] Take the gear fault in the JZQ250 two-stage transmission gearbox as an example below. The gearbox is driven by a three-phase motor connected with an elastic coupling. 1 =64 / 35, low-speed gear ratio i 2 =81 / 18, input shaft speed n during work 1 = 1500 rpm, output shaft n 2 =176 rpm.

[0021] When the gear is in the normal and abnormal state, the impact meshing vibration will occur due to the meshing of the teeth, but the magnitude of the impact will change with the different gear states. Various abnormal conditions of the gears will cause the increase of the meshing impact force, and the fault frequency of the abnormal gears is generally ...

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Abstract

The invention relates to a diagnostic system of a non-contact type rotary mechanical failure in the technical field of detection, comprising a sound pressure measurement device, a computer, a sound field reconstructing module, an acoustic holography training sample storage module, an acoustic holography test sample storage module, an off-line training module and an online diagnostic module, wherein the sound pressure measurement device is connected with the computer, the computer is connected with the sound field reconstructing module, the sound field reconstructing module is connected with the acoustic holography training sample storage module and the acoustic holography test sample storage module, the acoustic holography training sample storage module is connected with the off-line training module, the acoustic holography test sample storage module is connected with the online diagnostic module, the off-line training module is connected with the online diagnostic module, the acoustic holography training sample storage module and the acoustic holography test sample storage module are connected with the computer, and the acoustic holography training sample storage module is connected with the online diagnostic module. The invention is a non-contact type, has simplicity and high accuracy rate and obtains favorable online diagnostic effect through optimization.

Description

Technical field [0001] The invention relates to a system in the field of detection technology, specifically a non-contact rotating machinery fault diagnosis system. Background technique [0002] At present, rotating machinery fault diagnosis is mainly based on vibration signal measurement and analysis. However, fault diagnosis based on vibration signals must place the sensor on the surface of the vibrating machine. However, it is difficult to arrange the sensor in harsh environments such as the vibrating surface of complex components, moving parts, high temperature or oil dirt. It can only measure the vibration of several isolated measuring points on the vibrating surface. The signal is analyzed, so it can only reflect the local vibration information of the equipment; and in some fault situations, the vibration characteristics are not obvious, while other characteristics (such as acoustic characteristics) are more obvious. [0003] Mechanical noise contains rich machine sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M99/00G01H17/00
Inventor 蒋伟康鲁文波侯俊剑
Owner SHANGHAI JIAO TONG UNIV
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