The Law Of Vibration Energy Flow Transfer In The Cabin Of Satellite Platform And Experimental Research

As remote sensing satellites are more and more widely used in various fields of life,people’s requirements for the accuracy of satellite photography are getting higher and higher.Various types of precision instruments have begun to be applied to remote sensing satellites,which puts forward the working environment of satellites.higher requirement.There are many factors that affect the quality of satellite imaging,of which vibration is one of the main factors.Traditional vibration research mainly analyzes by obtaining parameters such as displacement,acceleration,stress,etc.,and cannot show the specific transmission process of vibration energy.However,the structural sound intensity law focuses on the analysis of the internal vibration energy distribution law from the viewpoint of energy flow.And the transmission conditions provide a convenient and accurate means for the analysis of the vibration characteristics of the structure.This subject takes the satellite platform cabin structure as the research object,and combines the structural sound intensity method to study the vibration energy transfer law on the platform cabin structure.First,briefly explain the structural composition of the satellite and the functional characteristics of the relevant single aircraft on the satellite,and combine the equivalent plate theory to perform equivalent treatment of the cabin honeycomb panel structure to obtain the elastic modulus,Poisson’s ratio,density and other related parameters of the equivalent plate,And establish the finite element model of the cabin structure.Analyze the disturbance characteristics of the main disturbance source flywheel on the satellite,establish the relevant mathematical model,derive the relevant expressions of the disturbance force and the disturbance torque,and build a flywheel disturbance force measurement platform to collect the flywheel at a stable rotation speed of 2000 rpm The disturbance data is prepared for the application of load in the subsequent dynamic analysis.Then,the matrix expression of the structure sound intensity and the transformation matrix of the spatial coupling structure coordinate system are deduced and established in detail,and the calculation method of the vibration energy flow of the spatial structure is obtained,and the correctness of the method is verified through experiments.The whole platform cabin structure is analyzed,and the vibration energy transmission path is divided into four according to the obtained streamline cloud chart result.The net transfer ratio is introduced,and the vibration energy transmitted by different paths and different waveforms are compared.The results show that the vibration energy transmitted from the front panel to the camera installation area is the largest,and the longitudinal waves on the first three paths are the main waveforms for transmitting energy,followed by shearing.Wave,the main waveform that transfers energy on the fourth path is shear wave,and bending wave energy is mainly generated near the vibration source,and there is mutual conversion between the waveforms in the process of energy transfer.Then,the law of vibration energy transfer and coupling characteristics under multisource disturbances are studied,a finite element model containing two excitation sources is established,and the energy transfer situation is compared with single source excitation.It is found that both of them pass through the front panel and the left partition.The plate transfers energy upwards,when multi-source excitation,the energy transferred by the left diaphragm is relatively large,and the longitudinal wave is the main wave of energy transfer.The multi-source coupling characteristics are deduced in detail from the theoretical aspect,and compared through simulation,it is concluded that the vibration energy flow does not satisfy the linear superposition.Reinforcement measures are taken on the left partition to block the energy transfer process,and good results have been achieved.Finally,the experimental measurement of the vibration energy flow of the cabin structure is carried out.The principle of vibration energy flow measurement is deduced,the parameters that need to be acquired for measurement are determined,the vibration energy flow test platform is built to collect the signals from the camera mounting side,and the data is processed in combination with the theoretical formula to verify the correctness of the simulation results.