振动试验扩展台的设计与动力学分析

Design and Dynamic Analysis of Vibration Test Expansion Table

目的验证碗型工装和板型工装结构在动力学试验方面的优劣。方法由于导弹舱段进行振动、冲击、加速度等动力学试验时,不能直接安装在台面结构上,需要设计和优化工装进行固定安装。针对某弹体舱段试验用的工装进行结构设计,并通过有限元仿真分析得出前六阶模态的频率和振型方式,判别碗型和板型两种结构设计方式的优劣。同时,对设计工装的结构进行优化,得出加强筋对模态参数的影响。结果质量相同的碗型工装的各阶频率均高于板型工装,加强筋的优化方式对于碗型工装结构的前三阶模态频率提升25%左右。结论碗型的工装结构形式能够有效地传递力学信号,保证信号传递的均匀性,加强筋结构可以有效地增强工装结构的动力学性能。

The paper aims to verify advantages and disadvantages of bowl-type and plate-type tooling structure in dynamic test.When the dynamic tests such as vibration,shock,acceleration,etc.were performed on missile cabin,it can not be directly installed on the mesa structure.Therefore,it is necessary to design and optimize the tooling for fixed installation.In this paper,the tooling for test of missile cabin was designed,and the frequency and vibration mode of the first six modes were obtained by FEM simulative analysis to discriminate the advantages and disadvantages of the bowl-type and plate-type structural design method.Meanwhile,the structure of the designed tooling was optimized to obtain the effect of stiffeners on modal parameters.The frequency of bowl-type structure in each order with the same quality was higher than that of plate-type structure.The optimization method of stiffener structure increased the frequency of the first three modes of bowl-type structure by about 25%.The bowl-type fixture structure can effectively transmit the mechanical signal and ensure the uniformity of signal transmission.The stiffener structure can effectively enhance the dynamic performance of the tooling structure.