内燃机缸体模态参数的稳态图识别方法

Modal Parameters Identification of Diesel Engine's Body Using LSCE Stabilization Diagram

利用LMS Test.Lab模态测试与分析系统,采用锤击法对某内燃机缸体进行模态试验。用最小二乘复指数法计算各阶模态的极点和留数,然后介绍建立稳态图的方法和利用稳态图判别真实模态频率的方法。最后给出此内燃机缸体的模态稳态图以及所识别出的前几阶模态参数。

With the use of hammering excitation method, the modal test of a diesel engine＇s body was made using LMS Test.Lab modal test and analysis system. The pole and the residue of each mode were calculated using least square complex exponential（LSCE） method. Then the stabilization diagram was built and the modal parameters of some low orders of the engine＇ s body were provided.