高速列车铝型材模态参数识别及阻尼影响分析  

Modal Parameter Identification of Aluminum Corrugated Section and Damping Effect Analysis

作　　者：刘佳[1,2] 王瑞乾[1,3] 肖新标[1] 金学松[1] 张玉梅[1] 韩健[1] 

机构地区：[1]西南交通大学牵引动力国家重点实验室,成都610031 [2]中国核动力研究设计院设计所,成都610031 [3]常州大学城市轨道交通学院,江苏常州213164

出　　处：《机械科学与技术》2016年第10期1629-1635,共7页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家863计划项目(2011AA11A103-2-2);国家自然科学基金项目(51475390;U1434201);教育部创新团队项目(IRT1178);中央高校基本科研业务费专项资金项目(SWJTU12ZT01);牵引动力国家重点实验室自由探索自主研究课题项目(2011TPL-T05)资助

摘　　要：为准确辨识像波纹状铝型材板这样的"空腔铝型板"结构模态,利用力锤敲击方法,获取激励点与响应点之间的频率响应函数并进行模态参数识别。模态参数识别过程中,首先获取了复模态指示函数法、稳态图法两种方法的识别结果,结合声振试验探讨识别结果中声腔模态对结构模态的影响,利用模态判定准则(MAC)验证模态重根;进而根据仿真频率和振型,对比两种模态参数识别结果的准确性;最后,基于仿真验证后的模态参数识别方法,探究阻尼材料对于铝型材模态密度和模态阻尼比的影响。结论表明:对波纹状铝型材板而言,复模态指示函数法结合声振试验分析可获取其真实模态;喷涂4 mm123WF阻尼材料后,模态阻尼比在整个频段内大大提高,模态密度在500 Hz、1 250 Hz和1 600 Hz频段内显著降低;结合我国高速列车车体板件振动实测频谱,建议车体顶板、边顶板、侧墙中部和侧板使用4 mm此类型阻尼材料。For the accurate identification of the physical modes of the aluminum corrugated-section plate with cavities,the hammer excitation method is hired to obtain the frequency response functions of the plate and its modal parameters are identified. In the modal parameter identification,the results obtained by using two methods are compared,and the two methods are,respectively,called the complex mode indicator function and the stabilization diagram. The influence of acoustic modes on the vibration modes is analyzed through the acoustic- vibration test,and the multiple roots are validated by using the modal assurance criterion（ MAC）. The accuracy of the two methods is validated through comparing the simulation results. The influence of damping materials by means of identification of modal parameters after the multiple roots validated is further analyzed. The obtained conclusions are as follows： as for the plate of aluminum corrugated section,the physical modes can be recognized with the complex mode indicator function with the aid of acoustic-vibration test; using the damping material can improve the modal damping significantly and dramatically reduce modal density at 500 Hz,1250 Hz and 1600 Hz. This type of damping material is suitable for use of high speed train car roof,roof,side wall and side panels with low vibration and noise,according to the measured frequency spectrum of plate vibration of high-speed trains from the fields.

关 键 词：模态参数识别 空腔铝型板 复模态指示函数法 稳态图法 阻尼影响 

分 类 号：TB535[理学—物理] TB53[理学—声学]