Equivalent stiffness method proposed by the authors is used to calculate free-vibration of thin high bridge piers, then the result of calculation is analyzed and compared with that of FEA method.
推导出薄壁高桥墩自振频率的计算公式，并将该公式计算结果与有限单元法计算值进行了分析与比较。
This paper presents a new method, the equivalent dynamic stiffness factor method, in dynamic balancing rotors.
用一种新的方法—等效动刚度系数法对转子的动平衡进行了研究。
Then, an equivalent linearization method is applied to get its linearized stiffness matrix. The estimating method for the equivalent fundamental frequency of the membrane is deduced.
应用等效线性化方法得到方程组的线性化刚度矩阵，给出了结构等效一阶频率的计算方法；
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