齿轮箱箱体高精度模态识别方法研究及结构优化设计

Research on High Precision Modal Identification Method and Structural Optimization Design of Gearboxes

考虑到齿轮箱箱体结构的复杂性,使用单点激励-多点响应模态识别技术对其前6阶模态进行识别,模态置信度即模态识别精度高。以试验获得的齿轮箱箱体前6阶模态为指标,提出了兼顾计算精度和计算效率的模态有限元计算方法;使用拓扑优化方法对齿轮箱箱体结构进行优化设计,优化后齿轮箱箱体在不同固有频率处的变形均得到了减小。研究为齿轮箱箱体结构优化设计提供了新思路。

Considering the complexity of the gearbox structure,the first six orders are identified by using the single-point excitation and multipoint response modal identification technology,and the modal confidence,namely,the modal identification accuracy is high.Based on the first six orders of the gearbox obtained from the test,a modal finite element calculation method considering both calculation accuracy and calculation efficiency is proposed.Subsequently,the topology optimization method is used to optimize the structure of the gearbox.Af⁃ter optimization,the deformation of the gearbox at different natural frequencies is reduced,which provides a new idea for the optimization design of the gearbox structure.