Moving part disturbance measurement and calculation method used for dynamics analysis of whole satellite
A technology for dynamic analysis and moving parts, applied in the field of satellite overall analysis to reduce dependence and test costs
Inactive Publication Date: 2017-03-22
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology
[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the existing technology, the disturbance force obtained from the single machine disturbance force test of the existing satellite active parts has a certain deviation from the disturbance force directly borne by the active parts, and directly substitute it into the whole satellite Analyzing the structural dynamics model will cause large errors, and provide a simple, low-cost, high-precision measurement and calculation method for the disturbance measurement and calculation of moving parts for dynamic analysis of the whole star
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[0087] The disturbance force test process of a control moment gyroscope (CMG) with a certain type of moving parts is as follows: Figure 5 As shown, since the CMG mounting surface does not match the mechanical interface of the Kistler force measuring platform, a flat transition tooling is used to connect the two. The Kistler force measuring platform is fixed on a rigid foundation. The control moment gyroscope 1 is installed on the force-measuring platform 3 through the first adapter tool 2, and the force-measuring platform 3 is mounted on the rigid platform through the second adapter tool 4. Before the disturbance force test, hammering signals in three orthogonal directions are first applied to the CMG installation surface, and the frequency response of the disturbance force measurement channel of the force measuring platform is measured, which is the reciprocal of the frequency domain correction function, as shown in Figure 7 shown. It can be seen from the figure that for ...
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The invention discloses a moving part disturbance measurement and calculation method used for dynamics analysis of a whole satellite. According to the method, a disturbance force obtained for a test has a certain deviation from a disturbance force which a moving part directly bears; and if the disturbance force obtained for the test is directly substituted into the whole satellite to perform structure dynamics analysis, a relatively large error is possibly caused. A mechanism for measuring the disturbance force of the moving part is analyzed; the influence of structure flexibility of the moving part and structure flexibility of a force test platform on a measurement error is discussed; a frequency domain correction function is defined in an influence relationship; and it is proposed that the frequency domain correction function is obtained by directly utilizing an existing test condition, and a calculated disturbance force measurement true value is directly used for the structure dynamics analysis of the whole satellite. The analysis of a CMG case of a type shows that due to the flexibility of a test tool, test data is remarkably distorted, and after a frequency domain correction method is adopted, a peak value corresponding to a main disturbance frequency is remarkably reduced. Moreover, the frequency domain correction function is implemented in the disturbance force measurement process, so that the method is simple, convenient and easy.
Description
technical field [0001] The invention relates to a method for measuring and calculating the disturbance of movable parts used for dynamic analysis of the whole satellite, and belongs to the technical field of overall satellite analysis. Background technique [0002] With the increasing accuracy of remote sensing satellite imaging, the vibration caused by moving parts on the satellite has an increasingly significant impact on imaging quality, microwave pointing accuracy, and satellite attitude accuracy. Testing the disturbance characteristics of moving parts on the star and analyzing the vibration response of the whole star caused by it is a necessary means to evaluate the degree of impact on imaging quality. [0003] The stand-alone test of moving parts is generally carried out on a six-component force measuring platform. The moving parts are fixed on the force measuring platform, and the disturbance force and moment are obtained through the sensors inside the platform. At p...
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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20
Inventor 何德华王光远蔡亚宁陈恩涛王涛马健张和芬
Owner BEIJING INST OF SPACECRAFT SYST ENG