惯导环架静动态特性分析与结构优化

Static and Dynamic Characteristics Analysis and Structure Optimization of Inertial Guidance Ring

环架是惯性导航装置的重要零件,其静动态特性对惯导系统的精度和稳定性至关重要。为提高惯导环架的刚度和抗振性,应用有限元方法对某型惯性导航装置的环架进行了静力学分析和振动模态分析。首先使用三维造型软件Inventor建立环架CAD模型;然后在有限元分析CAE软件ANSYS Workbench上对其进行了静力学分析和振动模态分析,得到了环架最大变形、应变、应力和固有频率;最后为减轻重量,对其进行拓扑优化,得到环架的最佳重量。结果表明,在满足静动态性能要求的前提下可实现环架轻量化目标,重量较优化前下降12.84%,为下一步改进设计提供了参考依据。

The ring is an important part of the inertial guidance device, and its static and dynamic characteristics have a crucial influence on the accuracy and stability of the inertial guidance system. In order to improve the stiffness and anti-vibration character of the ring, the finite element method is used to analyze the static and modal vibration characteristics of a certain type of inertial guidance ring. Firstly, Inventor is adopted to establish the three-dimensian CAD model of the ring. Secondly, the engineering analysis CAE software ANSYS Workbench is used to conduct the static and modal vibration analysis, so the maximum deformation, strain, stress and natural frequency of the ring are obtained. Finally, to reduce the ring weight and obtain the optimal weight, the topology optimization is performed. The results show that on the premise of guaranteeing the static and vibration characteristics requirements, structure optimization and lightweight of the ring can be achieved, and the weight is reduced by 12.84% after optimization, which provides a reference for the next step to improve the design.