机械振动与机械设计及设备工作具有密切的关系。在设计及设备工作中常常需要获得振动系统的固有角频率及相应的主振型。对于多自由度的机械振动系统要计算上述数据须作相当烦锁的数字运算。本文对多自由度无阻尼振动系统采用了有效的矩阵迭代法 Mechanical vibration and mechanical design and equipment are closely related. In the design and equipment work, it is often necessary to obtain the natural angular frequency of the vibration system and the corresponding main mode. For the multi-degree-of-freedom mechanical vibration system to calculate the above data to be quite annoying digital computing. In this paper, an effective matrix iteration method is adopted for the multi-degree of freedom undamped vibration system