基于有限元的激光板厚测量系统C形框架结构设计

运用结构有限元优化设计方法，对C形框架进行模态分析和优化设计。通过结构的动态分析，结合激光测厚原理，确定了影响测量精度的关键模态为第1、2、6、8阶模态。以提高各阶模态固有频率为目标函数，以避开现场共振频率为约束方程，进行结构频率优化。通过优化后框架的各阶模态的固有频率得到提高，同时避开影响测量精度的共振频率。优化后结构能够适合于现场工作环境，保证整个装置的测量精度。

Structural Design of C-frame in Sheet Thickness Measurement System with Laser Based on FEM

By means of finite element method,modal analysis and structure optimization of C-frame was introduced.Combined with thickness measurement theory,and with dynamic analysis of structure,it was determined that the first-order mode,second-order mode,6th-order mode and 8th-order mode are the key modes of C-frame structure which influence the measurement accuracy.The objective function was set to increase every mode's natural frequencies of C-frame and the constraint equation was set to avoide the frequencies which lead to resonant vibration with the(vibration) from working environment.By optimization of structure,the natural frequencies are increased.And at the same time,the key modes which can arouse sympathetic vibration and influence the measurement accuracy are avoided greatly.The structure of C-frame after optimization can adapt to industrial environment and guarantee measurement precision of the equipment.