复杂结构冲击声合成及实验验证  

Impact sound synthesis method of complex structures and the experimental verification

作　　者：张冰瑞[1] 陈克安[1] 丁少虎[1] 

机构地区：[1]西北工业大学航海学院环境工程系,西安710072

出　　处：《物理学报》2014年第22期217-223,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11074202);西北工业大学博士论文创新基金(批准号:cx201233)资助的课题~~

摘　　要：以复杂结构受击振动响应的时域计算为目的,讨论了结构阻尼的计算方法,给出一种用于冲击声合成的综合数值方法,并进行了实验验证.首先,考虑到阻尼是影响瞬态振动时变特性的重要因素,详细讨论了两种模态阻尼的计算方法;其次,对阻尼板的受击振动和声辐射进行了时域仿真,并与时域有限差分法的计算结果进行对比,显示出两种声音合成方法的计算结果具有高度的一致性;最后,针对有限长圆柱壳的受击振动,将合成声与实验录音进行了对比研究.结果表明,合成声与实际录音的时域包络、频谱结构以及衰减趋势基本一致,证明了采用数值方法进行冲击声合成的有效性.In order to simulate the structural vibration and acoustic field in time domain, we discuss the calculation method of the structural damping and provide an integrated numerical method for impact sound synthesis which is finally well verified experimentally. Firstly, since the damping is considered to be one of the factors influencing the time-varying characteristics of the transient vibration, the detailed information are obtained by both of modal damping calculating methods. Secondly, the vibration and sound radiation of damping impacted plates are simulated in the time domain, showing that they are highly consistent with the results from the finite-difference time-domain method. Finally, the comparison between the impact sound of the finite cylindrical shell and the experimental results is performed, indicating that the two sounds are much the same in the temporal envelope, spectral structure and decay trend. What is more, the results imply that it is quite effective to use the these numerical methods to synthesize impact sounds.

关 键 词：声音合成 模态阻尼 冲击声 数值方法 

分 类 号：O321[理学—一般力学与力学基础]