伝達関数合成法を用いた柔軟付属物を有する弾性支持剛体の振動解析

抄録

In machine tools, the low frequency vibrations are produced due to the acceleration and deceleration of the machining table. They lead to the relative displacement between the tool and the workpiece, resulting in lower machining accuracy. The vibrations are mainly rigid body vibrations of the entire machine installed on the foundation. Although they are affected by the characteristics of the foundation, it is difficult to theoretically estimate the vibration characteristics of the foundation. In this study, we propose a method for predicting the vibration characteristics of the machine installed on the foundation before its installation based on the FRF(frequency response functions)-based substructuring method. The method combines the FRFs of the foundation measured by the vibration test with those of the machine. As a basic study, we verify the validity of the prediction method using an analytical model for a rigid body with a flexible appendage supported by elastic bodies with which the supports and the foundation are modeled. Furthermore, we examine the support location to reduce the relative displacement between the rigid body and the flexible appendage.