上海交通大学学报
• •
摘要: 本文设计了窄流道内两端固定的矩形平板流致振动实验,获得了该平板的振动响应特性。结果表明:导致平板振动的物理机理为湍流激振和涡激振动。湍流激发平板的一阶固有频率响应,激励随流速的增大而增大。涡激振动频率与流速呈线性正相关关系,实验范围内得到的St数为0.24。当泄涡频率接近固有频率时产生“锁定”现象并引发共振,且存在非线性倍频响应。随着流速的变化,平板的一阶固有频率没有明显的变化趋势。此外,湿模态分析表明,声固耦合法计算得到的结果与实验吻合较好。
关键词: 矩形平板, 流致振动, 湿模态, 声固耦合
Abstract: Experiments on flow induced vibration of a rectangular flat plate with two ends fixed in a confined channel are conducted in this study, and vibration response characteristics of the plate are obtained. The results show that the main physical mechanisms of vibration are turbulent-induced vibration and vortexinduced vibration. The turbulence excites response of the first natural frequency of plate and is amplified with the increasing flow velocity. The frequency of vortex-induced vibration shows a linear increase with the flow velocity, and the St number is 0.24 within the test range. The ‘lock-in’ phenomenon and resonance occur when the vortex shedding frequency is approaching the natural frequency, and the non-linear harmonic shows up. In addition, the wet modal analysis based on acoustic-solid coupling method were conducted and the predicted results show a good agreement with the experimental values.
Key words: Rectangular flat plat, Flow-induced vibration, Wet modal, Acoustic-solid coupling
中图分类号:
O35
吴逸恺, 朱晔晨, 龚圣捷. 窄矩形流道内平板流致振动响应(网络首发)[J]. 上海交通大学学报, doi: 10.16183/j.cnki.jsjtu.2024.106.
WU Yikai, ZHU Yechen, GONG Shengjie. Flow-induced Vibration Response of a Flat Plate in a Confined Rectangular Channel[J]. Journal of Shanghai Jiao Tong University, doi: 10.16183/j.cnki.jsjtu.2024.106.
/ 推荐
导出引用管理器 EndNote|Ris|BibTeX
链接本文: https://xuebao.sjtu.edu.cn/CN/10.16183/j.cnki.jsjtu.2024.106