Analysis of Structural Coupling And Decoupling Problems Using Generalized Modal Force Technique

• Main Authors: Jang, Ian Been, 張豔鬢
• Other Authors: Jiann-Lin Hwang
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/08464301616300732559

碩士 === 逢甲大學 === 自動控制工程研究所 === 84 === To design a structure, it is often required to add or extract a substructure to meet the design criteria without re- analyzing the changed structure. Many component synthesis methods are developed in recent years, but only Inamura and Dowell discuss the decoupling technique. It directly deal with the mass and stiffness matrices for finite element analysis. Recently, Yee, Tsuei and Lin developed a component synthsis method named Modal Force Technique. It directly works with the frequency response functions at joint to predict the dynamic behavior of a synthesized structure. By using this method, fewer orders of the system matrix, no matrix inversion and the system matrix containing both of the system and substructure modes are its privileges. These features can be applied to the dynamic decoupling. A very similar concept of the Modal Force Technique is used to derive the decoupled system equation. The eigensolution of this decoupled system gives the natural frequency and corresponding eigenvector of the decoupled structure. Futher investigating these coupled and decoupled system equations, a generalized Modal Force Technique can be summarized for structural analysis both in the area of coupling and decoupling. To illustrate the generalized Modal Force Technique, a lumped system and a beam structure are presented. The numerical results indicate that the generalized Modal Force Technique is effective in dynamic coupling as well as in dynamic decoupling and can be used in structural analysis and design.