复杂结构模态的精细试验识别方法研究  

Study on fine experimental identification method of complex structure mode

作　　者：郑光泽[1] 肖鹏[2] 

机构地区：[1]重庆理工大学汽车零部件先进制造技术教育部重点试验室,重庆400054 [2]重庆理工大学机械工程学院,重庆400054

出　　处：《自动化与仪器仪表》2015年第2期179-182,共4页Automation & Instrumentation

基　　金：国家科技支撑计划项目2012BAH32F01;02资助

摘　　要：以发动机缸体为对象,本文研究了复杂结构试验模态参数的精确识别方法。基于缸体有限元模型的模态分析结果,采用预试验方法确定模态试验测点布置方案;利用模态置信度MAC、模态相位共线性MPC以及平均相位偏移MPD等指标检验模态识别精度;基于变形协调原理利用结构分析软件对试验模态进行模态扩展分析,得到较好的模态振型识别精度。Taking engine block as an example, the precise identification method of test modal parameters of complex structure was investigated. Based on modal simulation results of engine block, the sensor layout scheme was determined with pre-test technology supported by LMS Corporation. The precision of experiment mode was verified by the Modal Assurance Criterion（MAC）,the Modal Phase Collinearity（MPC）,and the Modal Phase Deflection（MPD）. In order to view the local mode accurately, based on the deformation consistency principle, test mode was expanded using the existed finite element model by structure analysis software.The better recognition accuracy of mode shape was achieved compared to conventional test modal parameter identification methods.

关 键 词：复杂结构 试验模态 识别精度 模态扩展 

分 类 号：TP212.6[自动化与计算机技术—检测技术与自动化装置]