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Mechanical fault monitoring system based on adaptive filter circuit

A technology of adaptive filtering and mechanical failure, which is applied to the testing, measuring devices, instruments, etc. of machine/structural components, which can solve the problems of increasing the difficulty of system processing and the false alarm rate, and reduce the false alarm rate of monitoring and the processing failure rate. effect of difficulty

Inactive Publication Date: 2019-11-08
AVIC SHANGHAI AERONAUTICAL MEASUREMENT CONTROLLING RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, mechanical vibration / fault is often a gradual process. In the process of slowly rising / falling, there is only one fundamental frequency, and the frequency that should be collected and analyzed is only a frequency band around the fundamental frequency. When collecting data in the full frequency band When , irrelevant noise and frequency will be sampled by the filtering system, which increases the difficulty of system processing and the false alarm rate

Method used

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  • Mechanical fault monitoring system based on adaptive filter circuit
  • Mechanical fault monitoring system based on adaptive filter circuit
  • Mechanical fault monitoring system based on adaptive filter circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In order to verify the effectiveness of the solution of the present invention, the following simulation experiments are carried out.

[0021] Assume that when a certain type of engine is working, when the spindle speed is 20Hz, according to the working principle of the gear transmission / reduction box, other shaft speeds are also multiples of 20Hz, and the maximum frequency of the engine output shaft is 1000Hz. When a fault occurs, the fault frequency Dots tend to be periodic and below 1000Hz. So we can set the filter's low-pass cutoff frequency to 2KHz.

[0022] At this time, the electrical signal output by the rotational speed sensor connected to the spindle is 20Hz. This signal is collected by the FPGA, and according to the preset input-output comparison table, the FPGA generates a 20KHz PWM wave to drive the programmable filter. According to the "input frequency_cutoff frequency" ratio of the programmable filter 10:1, the low pass cutoff frequency of the programmabl...

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Abstract

The invention discloses a mechanical fault monitoring system based on an adaptive filter circuit. The system comprises a vibration sensor, a rotating speed sensor, a programmable filter connected to the vibration sensor, a filter circuit connected to the programmable filter, an analog-digital converter connected to the filter circuit, a processor connected to the analog-digital converter and an FPGA connected to the processor, the rotating speed sensor and the programmable filter, wherein the vibration sensor and the rotating speed sensorare connected to a tested machine. According to the system, the cut-off frequency of the filter circuit can be changed, can be set according to a base frequency value obtained from the rotating speed sensor, and can also be set according to data of the processor; and the processing difficulty of the back-end processor can be reduced and the false alarm rate can be monitored by adaptively filtering the unwanted frequency.

Description

technical field [0001] The invention relates to a mechanical fault detection technology, in particular to a mechanical fault monitoring system based on an adaptive filter circuit. Background technique [0002] The vibration sensor installed on the mechanical surface will vibrate with the vibration or rotation of the monitored part, and obtain an electrical signal that is consistent with the frequency of the monitored part and whose amplitude is positively correlated with the vibration acceleration value. When a fault occurs, the electrical signal will appear Amplitude or frequency values ​​that exceed thresholds, therefore, mechanical faults can be detected by monitoring the electrical signal of the vibration sensor. The fault monitoring system requires that the passband range of the filter circuit must cover the frequency range of mechanical vibration, and the frequency range of mechanical vibration is generally distributed from a few Hz to dozens of KHz, so the passband ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M99/00
CPCG01M99/004
Inventor 巩玉楠徐丽清汪慧云李兴旺
Owner AVIC SHANGHAI AERONAUTICAL MEASUREMENT CONTROLLING RES INST