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。
Abstract
A newly woodbamboo composite material was used as the busplatform. Modal parameter was identified using the Experiment Model Analysis (EMA). The modal parameter (the natural frequency and damping ratio ) of woodbamboo composites used as the busplatform 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 free 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 lowmodes vibration.
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基金
收稿日期：2008-04-21修回日期：2008-10-15基金项目：国家高技术研究发展计划(2002AA2415171)；江苏省科技攻关项目(BE2003309)作者简介：杨淑琴(1970—)，工程师。* 杨家富(通讯作者)，教授，研究方向为林业与木工机械、测控技术。Email: jfyang@njfu.com.cn引文格式：杨淑琴,杨家富,罗江丽,等. 基于EMA理论的木/竹复合客车底板参数识别技术[J]. 南京林业大学学报:自然科学版,2009,33(2):103-106.
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