某导弹振动夹具设计及测试分析

目的设计符合某导弹振动试验要求的夹具。方法采用SolidWorks和Workbench两种软件协同分析的方法,对振动夹具进行设计。首先使用SolidWorks建立导弹振动夹具的实体模型,之后在Workbench中采用有限元方法对夹具进行模态分析。根据模态分析结果,在对夹具进行多次的结构修改和分析计算后,得到满足设计要求的夹具。将设计合格的夹具加工制作后,在振动台进行传递特性分析,以验证设计和分析结果。结果根据振动夹具模态振型的变化趋势,可以通过增加夹具的底板和立板的厚度来提高夹具的固有频率。通过计算,将夹具底板和立板的厚度均增加到30.0 mm时,夹具的固有频率达到了311.68 Hz。将加工好的夹具按照实际试验方式固定在振动台,并进行动态响应测试,得到夹具一阶频率为410.0 Hz。结论设计方法达到了振动夹具的基频大于被试品3~4倍的目标,满足了导弹振动夹具的动力学特性要求。

Design and Test Analysis of Vibration Fixture for a Missile

A fixture is designed to meet the vibration test requirement of the missile. The vibration fixture was designed using the collaborative analysis method of both SolidWorks and Workbench software. Firstly, SolidWorks was used to build the solid model of the missile vibration fixture, and then the modal analysis of the fixture was performed in Workbench using the finite element method. According to the modal analysis results, a fixture that meets the design requirements is obtained after several structural modifications and analytical calculations of the fixture. After machining and fabricating the designed fixture, The transfer characteristic analysis of the fixture is carried out on the shaker to verify the results of the analysis and design after the fixture is manufactured. According to the variation trend of the modal shapes, the inherent frequencies can be increased by enhancing the thickness of the bottom plate and vertical plate of the fixture. The first-order inherent frequency reaches 311.68 Hz by increasing the thickness of the bottom plate and vertical plate to 30.0 mm. The manufactured fixture is fixed on the shaker according to the practical test method, and the inherent frequency of the fixture is obtained with 410.0 Hz after the dynamic response test for the fixture. The objective is attained for the fundamental frequency of the fixture is greater than the tested object, and the dynamic characteristic requirement of the fixture is satisfied.