摩擦型ダンパ翼の振動解析

抄録

Recently, in order to improve power plant thermal efficiency, the turbine blade, which is the most important element of the power plant, has been used under severe conditions of high loading. Therefore, for the purpose of increasing plant reliability, the blade with friction dampers has been used. This paper presents the analysis method to predict damping characteristics of the dampered blades by applying the harmonic balance method to the bladed disk. The numerical results show that a large damping effect can be obtained by using the damper elements. It is found that the peak frequencies of the dampered blades can be estimated by the linear finite-element method, if we choose the appropriate ratio of the friction force and the excitation force. Also, the validity of the method used in this paper is examined by comparing the calculated results with the experimental data.