基于LMS系统的某型高射机枪模态分析

摘要

Based on the LMS Test Lab modal analysis software and data acquisition system, multi-point incentive and single-point response method was used in the excitation experiments on a certain type of AAMG mounted on a homemade gun rack. The PolyMax modal extraction method was used, the modal parameters and the corresponding vibration modes of the first eleven orders of AAMG were obtained. Conclusion is that the deformation of the machine gun exhibited as the vertical and horizontal vibration characteristics;and the stiffness of the homemade experimental gun rack conformed with the experimental standard. The results provide theoretical basis for further improving the structure dynamic characteristic of this type of AAMG.%基于LMS Test Lab模态分析软件及数据采集系统,对自制实验枪架上的某型高射机枪,采用多点激励单点响应法进行激振实验.通过PolyMAX模态参数识别方法,对测试数据进行模态分析,获得了该机枪结构的11阶模态固有频率、阻尼及其振型;得出机枪的变形主要表现为纵向和横向的振动特性;证明了自制实验枪架的刚度符合射击实验的标准.本研究得到的结果,为进一步指导该型高射机枪系统结构动态优化设计提供了理论依据.