机载装置的振动试验夹具设计

Design of Fixture for Airborne Equipment in Vibration Test

根据某机载装置振动试验条件及有关振动环境试验夹具设计规范,在分析复杂机载装置的结构和振动试验台选型的基础上,进行了夹具的结构设计。基于夹具的三维实体模型进行了有限元模态分析,得到了夹具的固有频率和振型。通过对夹具有限元模型进行PSD谱分析,得到了夹具上各点的"能量"放大云图。测试结果表明:所设计的夹具具有较好的刚性、合理的品质因数。

According to the vibration conditions and the fixture design standardization in vibration environment test, the fixture for the airborne equipment is designed with the help of the analysis of the complex airborne equipment structure and the model selection of vibrating test bench. The finite element modal analysis of the fixture is per formed based on the threedimension solid model, thus its natural frequency and vibrating mode are obtained. Fur thermore, the ＂Energy＂ magnifying cloud picture is drawn on the basis of the PSD spectral analysis of the fixture fi nite element model. The research and the relevant test show that the designed fixture has good stiffness and reasona ble quality factor, which can satisfy the fixture design requirements. The present approach can be applied to the de sign of vibration test fixture for large scale as well as complex structure.