Method and system for identifying modal frequency of whole-satellite flexible vibration using satellite gyroscope data
A flexible vibration and modal frequency technology, applied in the field of measurement and testing, can solve the problems of increasing the number of slip ring signal channels of the drive mechanism, increasing design difficulty, and restrictions
Active Publication Date: 2020-10-09
SHANGHAI SATELLITE ENG INST
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Problems solved by technology
Second, the number of vibration sensors installed on flexible accessories is limited by engineering implementation
Generally, flexible accessories need to be deployed on rails, and the installation and fixing of various speed, acceleration, and displacement sensors, as well as cable laying, will have adverse effects on the deployment mechanism, increasing the difficulty of design
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[0028] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the inventive concept. These all belong to the protection scope of the present invention.
[0029] like figure 1 As shown, the present invention provides a method for identifying the flexural vibration modal frequency of an entire satellite by using satellite gyro data, comprising:
[0030] Data selection steps: select the attitude angular velocity measurement data of the under-damped free vibration zone after the satellite on-orbit jet closed-loop control;
[0031] Band-pass filtering step: perform band-pass filtering of the frequency band of interest on the attitude angular velocity measurement dat...
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The invention provides a method and system for identifying the whole-spacecraft flexible vibration modal frequency through data of a satellite gyroscope. The method includes the steps of selecting theattitude angular velocity measuring data of an underdamping free vibration area after satellite on-orbit jet closed loop control, conducting band-pass filtering of the focused frequency band on the attitude angular velocity measuring data to obtain the filtered attitude angular velocity, analyzing the power spectrum density of the filtered attitude angular velocity, and calculating the on-orbit vibration frequency of the focused modal. The requirement for identifying the flexible satellite on-orbit structure dynamic characteristic is met, no other sensors need to be installed on a flexible accessory, and analysis treatment is conducted only through the measuring data of an existing inertial attitude sensor on a satellite platform. The satellite design, manufacturing difficulty and on-orbit operation risks increased due to the installation of other vibration sensors are avoided.
Description
technical field [0001] The invention relates to the technical field of measurement and testing, in particular, to a method and a system for identifying the flexural vibration mode frequency of an entire satellite by using satellite gyro data. Background technique [0002] With the continuous development of aerospace technology, large-scale space structures have become an important development direction in the aerospace field, and will also be the necessary infrastructure for space development. Please refer to (Yu Dengyun, Xia Renwei, Sun Guojiang. On-orbit spacecraft power Research on Science Parameter Identification Technology. China Space Science and Technology, February 2008, No. 1). In order to obtain the dynamic characteristics of the flexible satellite structure, methods such as finite element modeling, ground test and on-orbit identification are often used to calculate the vibration modal parameters. Model simplification and conditional assumptions in the finite elem...
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IPC IPC(8): G01M7/02
CPCG01M7/02G01M7/025
Inventor 吕旺董瑶海周徐斌王皓苏若斌宋效正
Owner SHANGHAI SATELLITE ENG INST