摘要
在力限振动试验复杂TDFS方法研究中,提出了一种带约束边界结构有效模态质量的获取方法—广义模态约束反力法。针对具有约束边界的结构,从其整体分块动力学方程出发,对其进行了详细理论推导,获得由各阶模态频率及对应的广义约束反力来计算各阶有效模态质量的理论方法。最终通过一端约束的悬臂梁的有限元计算结果说明了该方法的有效性。
In complex TDFS method of limited vibration testing, acquiring a structure with restriction boundary, a novel non-force-measured method is presented to acquire effective modal mass of a structure with restriction boundary. For a structure with restriction boundary, beginning with it’s whole dynamic equation, through particular reduction each mode frequency and effective modal mass with generalized reaction force was derived. Finally validity of this method was demonstrated by using the FEM result of a cantilevered beam.
出处
《强度与环境》
2010年第2期24-28,共5页
Structure & Environment Engineering
关键词
有效模态质量
广义约束反力
约束边界
effective modal mass
generalized reaction force
restriction boundary
