Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2019
Date : August 27, 2019 - August 30, 2019
Beams with folds may have mode of vibration with locally large amplitude. This paper proposes a design method to give vibration modes having a large amplitude at desired position and desired natural frequency for a folded beam. The method consists of two steps. In step 1, focusing on the waves propagating in the beam, the position and angle of the fold are determined from the increase and decrease of the wave at the fold. Wave vector is introduced in order to deal with waves propagating through the beam. It is possible to determine design variables sequentially by the assumption to avoid numerical instability caused by evanescent waves. In step 2, numerical optimization is performed to match the natural frequency to the desired frequency. The validity of the proposed method is confirmed by designing several folded beams.
