EXPERIMENTAL STUDY ON VIBRATIONAL CHARACTERISTICS OF A RECTANGULAR BOTTOM PLATE IN CONTACT WITH FLUID

摘要

The vibration of fluid-structure interaction system is a key problem in many fields. In this paper, the vibrational characteristics of a rectangular plate clamped at the bottom of a container filled with fluid is studied through experimental approach. The natural frequencies of the fluid-plate system with different fluid depth are derived by modal test. The frequency results show that the natural frequencies of the plate decrease greatly in contact with fluid compared to that in air. Dynamic response test of the plate subjected to mechanical excitation in the cases both in contact with fluid and in air are also carried out. When the plate is subjected to mechanical excitation, the acceleration frequency response peaks of the plate in contact with fluid wholly shift to the low frequency range with the fluid height increasing.