基于有效模态质量的子结构主模态选择方法  

Selection of Substructure Normal Modes Based on Effective Modal Mass

作　　者：邓兆祥[1,2] 李兴泉[1,3] 章竟成[1] 李英强[1] 阳小光[1,2] 

机构地区：[1]重庆大学,机械传动国家重点实验室,重庆400030 [2]汽车噪声振动和安全技术国家重点实验室,重庆400039 [3]重庆长安铃木汽车有限公司,重庆401321

出　　处：《汽车工程》2013年第6期543-547,564,共6页Automotive Engineering

基　　金：973国家计划项目(2010CB736104);汽车噪声振动和安全技术国家重点实验室开放基金(NVHSKL-201104)资助

摘　　要：根据建筑物抗震设计中有效模态质量计算的基本原理,推导了固定界面模态综合中子结构各阶主模态的模态参与因子和有效模态质量,以及总的有效模态质量的计算方法。根据各阶有效模态质量与总的有效模态质量之比,对某样车模型的子结构主模态进行截断。结果表明:在一定频率范围内,采用子结构主模态截断法,仅保留少数低阶主模态,即可使样车低频振动特性计算结果具有较高的精度。Based on the basic principle of effective modal mass calculation in the seismic design of building,a calculation method for the modal participation factor and effective modal mass for each normal mode of substructure,as well as the total effective mass in fixed interface modal synthesis is derived.The normal modes of each substructure for a sample vehicle are truncated base on the ratio of each normal mode effective mass over total effective mass.The results show that in certain frequency range,using substructure normal mode truncation method can get a calculation result of the low-frequency vibration characteristics of sample vehicle with high accuracy by retaining only a few low-order normal modes.

关 键 词：振动 频率 模态综合 子结构 有效模态质量 

分 类 号：TU352.11[建筑科学—结构工程]