Modal testing and model updating of space deployable antenna
In order to accurately predict the mechanical properties of the structure and accurately approximate the test results of the simulation,the finite element model must be corrected.In this paper,the modal test of the 3 m deployable antenna prototype was carried out,and the natural frequencies and vibration model shapes of the structure were obtained under the free state of the prototype.In view of the characteristics of the flexible and complex structure modal parameters of the deployable antenna,which are difficult to identify and there are many parameters to be corrected,the modified parameters were selected in a targeted manner.The finite element model was corrected by using the model correction method based on the sensitivity type of design parameters,the error between the prototype and the simulated natural frequency and mode shape was reduced,a modal test process and a model correction method containing the cable-net structure were obtained.
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