列车白车身损耗因子试验研究  

Experimental study on loss factors for train carriage body in white

作　　者：欧阳山[1,2] 鲁帆[2] 伍先俊[2] 隋富生[2] 

机构地区：[1]中国科学院大学,北京100190 [2]中国科学院声学研究所噪声与振动重点实验室,北京100190

出　　处：《振动与冲击》2015年第5期20-25,共6页Journal of Vibration and Shock

基　　金：国家973计划(2013CB632900);国家863计划(2011AA11A103)资助项目

摘　　要：对7 m长高铁车厢白车身划分子系统,根据能量平衡方程确立子系统总损耗因子、内损耗因子和耦合损耗因子的关系,通过测量总损耗因子和能量比可以直接计算内损耗因子和耦合损耗因子。为了准确测量总损耗因子,计算中采用Hilbert变换求瞬态信号对数衰减率的方法,其创新点在于不需要测量输入功率就可以得到完整方程并获得统计能量分析参数。内损耗因子和耦合损耗因子的计算结果可以为建立车厢能量统计模型提供数据参考。The train carriage body in white（ BIW）,with the length of 7 meters,was divided into 6 subsystems.Based on the energy balance equation,the interrelation among total loss factor,internal loss factor and coupling loss factor of subsystems was determined. Internal loss factor and coupling loss factor can be calculated by using experimental results of total loss factor and the energy ratio. In order to improve the accuracy of experimental results of total loss factor,a method of Hilbert transform, without need of measuring input power, was introduced to calculate the logarithmic decrement of transient response. The results of loss factors can be used for building up the statistical energy analysis（ SEA） model of high speed railway carriage.

关 键 词：白车身 统计能量分析 总损耗因子 内损耗因子 耦合损耗因子 HILBERT变换 

分 类 号：TB535.1[理学—物理] U271.91[理学—声学]