基于应变能分析的附加阻尼结构设计评价和准则优化方法  

An evaluation and optimization criteria method for structures with damping treatments based on strain energy analysis

作　　者：吕毅宁[1,2] 吕振华[1] 赵波[1] 王超[1] 

机构地区：[1]清华大学汽车工程系汽车安全与节能国家重点实验室,北京100084 [2]中国船级社技术研究开发中心,北京100007

出　　处：《振动工程学报》2010年第6期620-624,共5页Journal of Vibration Engineering

基　　金："十一五"863计划重点资助项目(2006AA110103)

摘　　要：基于附加阻尼结构的模态应变能分析方法,对模态损耗因子关于附加阻尼的灵敏度和附加阻尼材料的相对利用效率进行了分析,并推导了以模态损耗因子最大为设计目标的附加阻尼层材料厚度分布的优化设计准则。对此推广,又进一步对强迫振动条件下结构的损耗因子关于附加阻尼的灵敏度和附加阻尼材料的相对利用效率进行了分析。由此,建立了一种分别根据自由振动模态和强迫振动响应对附加阻尼结构设计进行分析评价的方法。基于附加阻尼层材料厚度分布的优化设计准则,还给出了一个附加阻尼结构的迭代优化设计方法。通过对一个车身地板附加阻尼结构的计算分析,验证了提出的分析评价和优化设计方法的有效性。Based on a modal strain energy analysis method,both the sensitivity of modal loss factors with respect to applied damping and the relative usage efficiency of applied damping materials are analyzed for structures with damping treatments.With the objective of maximizing modal loss factors,an optimization criteria is proposed for optimal thickness distribution of damping layer.As a generalization,corresponding sensitivity and relative usage efficiency analyses are further performed for the forced frequency response of structures with damping treatments.So far an evaluation method for applied damping treatment design is obtained according to both modal and forced responses.Based on the optimizaion criteria,an iterative optimization procedure is proposed as well.The damping treatment design for the floor panel of an actual car body is evaluated and optimized,which demonstrates the effectiveness of the proposed methods.

关 键 词：附加阻尼 应变能分析 灵敏度分析 结构优化设计 车身结构 

分 类 号：U463.82[机械工程—车辆工程] O328[交通运输工程—载运工具运用工程]