803 レーザーを用いた新しい加振実験方法

Abstract

The impulse excitation method in vibration test is generally carried out with an impulse hammer. However, it is not suitable for measuring the vibration characteristics of structures in high frequency region because the input with the impulse hammer doesn't become an ideal impulse wave form. In this paper, an approach to generate an ideal impulse force is proposed with laser ablation caused by a high-power laser irradiation to the structure. The ideal impulse excitation can be achieved by the proposal technique, resulting in a significant improvement on precision and reliability in high frequency measurement.