基于EMA理论的木/竹复合客车底板参数识别技术  

Parameter identification of wood-bamboo composites used as the bus-platform using EMA theory

作　　者：杨淑琴[1] 杨家富[2] 罗江丽[3] 张晓冬[4] 

机构地区：[1]南京应天职业技术学院,江苏南京210046 [2]南京林业大学机械电子工程学院,江苏南京210037 [3]成都航空职业技术学院,四川成都610021 [4]南京林业大学竹材工程研究中心,江苏南京210037

出　　处：《南京林业大学学报（自然科学版）》2009年第2期103-106,共4页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家高技术研究发展计划项目(2002AA2415171);江苏省科技攻关项目(BE2003309)

摘　　要：基于实验模态分析(EMA)理论,利用脉冲激励试验和数字信号处理软件CRAS V5.1对木/竹复合客车底板的动态性能进行测试,分析了脉冲响应函数及实频、虚频特性曲线,研究了木/竹复合客车底板在不同支承条件下横、纵向的动态特性。结果表明:相同试件,自由支承条件下所测得的频率比悬臂梁状态要小2%左右,悬臂梁状态阻尼比明显大于自由状态阻尼比;同样支承方式,同一材料的横向固有频率明显小于纵向固有频率,约为纵向固有频率的88%,纵、横向阻尼比相差不大。A newly wood-bamboo composite material was used as the bus-platform. Modal parameter was identified using the Experiment Model Analysis （EMA）. The modal parameter （the natural frequency and damping ratio ） of wood-bamboo composites used as the bus-platform were analyzed by means of impulse excitation as well as the technique of signal processing. According to the impulse response function and real frequency/imaginary frequency figure under fi＇ee end bearing and cantilever beam condition. The results showed that for the same species, the natural frequency under free end bearing condition was smaller 2% than that under cantilever beam condition. For the same supporting, the transverse natural frequency was smaller than the lengthways natural frequency . This provided a basis in dynamic design and modification. Furthermore, this simple and effective approach could also be used as a reference for any test of the dynamic characteristic at low-modes vibration.

关 键 词：木/竹复合板 客车底板 模态分析 参数识别 

分 类 号：S781[农业科学—木材科学与技术]