Micro-vibration signal processing method

A signal processing and micro-vibration technology, which is applied to measuring devices, instruments, and measuring ultrasonic/sonic/infrasonic waves, etc., can solve unseen problems, reduce workload, reduce the accumulation of calibration errors, and facilitate use.

Active Publication Date: 2014-01-08
BEIJING INST OF SPACECRAFT SYST ENG +1
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Problems solved by technology

[0004] At present, there is no literature report on the micro-vibration signal processing of this kind of micro-vibration measurement system at home and abroad.

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Embodiment Construction

[0028] Such as image 3 As shown, the present invention provides a micro-vibration signal processing method, the voltage signal measurement is carried out on an eight-sensor six-component rigid force measuring platform, characterized in that the steps are as follows:

[0029] (1) Install the calibration plate on the eight-sensor six-component rigid force measuring platform, and tighten it with bolts; the calibration plate is a square aluminum plate, such as figure 1 As shown, there are 3 percussion points evenly distributed on the four sides of the calibration plate, 4 percussion points are distributed on the upper surface, and the lower surface is connected with the eight-sensor six-component rigid force measuring platform; the eight-sensor six-component rigid force measuring The platform is composed of eight unidirectional piezoelectric sensors, four of which are arranged along the horizontal direction to ensure that two disturbance forces along the horizontal direction and ...

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Abstract

The invention discloses a micro-vibration signal processing method for processing acquired micro-vibration signals and obtaining disturbance-vibration force and error analysis. The micro-vibration signal processing method comprises the following steps of: firstly, installing a calibration disc on a six-component eight-sensor disturbance-vibration-force testing platform fixedly, hammering 16 calibration points on the calibration disc by using a standard force hammer, and when hammering at every time, acquiring voltage time-domain signals of the force hammer and eight sensors and a frequency response function of the six-component disturbance-vibration force testing platform; obtaining a calibration matrix and calibration errors by the calibration process; secondly, acquiring time-domain data by a data acquisition system when moving parts on the six-component eight-sensor disturbance-vibration-force testing platform generate small disturbance for the testing platform, acquiring the time-domain data by the data acquisition system, obtaining a frequency-domain result by fast Fourier transform, obtaining a disturbance-vibration-force frequency-domain signal by the calibration matrix and obtaining disturbance-vibration-force time-domain data by inverse Fourier transform.

Description

technical field [0001] The invention relates to a micro-vibration signal processing method, which can be used for dynamic measurement of vibration signals of spacecraft micro-disturbance loads on 8 sensors, and the disturbance force is obtained by processing the micro-vibration signals through relevant theories. Background technique [0002] Most of the current spacecraft are large-scale flexible deployment mechanisms with a large number of optical elements, which have high requirements for pointing accuracy and stability. In addition, in the attitude control system of modern spacecraft, reaction wheels, single-frame moment gyroscopes and solar wing drive mechanisms are important components in the control system. While they provide the necessary control power, they will also cause some harmful vibrations ( For simplicity, the above three systems are collectively referred to as disturbance sources below). These disturbances are mainly caused by flywheel unbalance, bearing di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H11/06
Inventor 杨文涛程伟李果董家俊王成伦王云峰刘凤晶赵煜王光远沈中
Owner BEIJING INST OF SPACECRAFT SYST ENG
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