Feedback Mechanism of Combinated Vibration Phenomenon of Fluid-Structure and Its Control

流固复合振动现象的反馈机制及其控制

• 批准号: 10650156
• 负责人: SAKAMOTO Hiroshi
• 金额: $ 2.18万
• 依托单位: Kitami Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650156/
• 关键词: Forced vibration; Free vibration; Rectangular prism; Flow-Induced vibration; Feedback Mechanism; Response characteristics of Oscillation; Suppration of Flow-Induced vibration; Flutter phenomenon; 流体・構造体連成振動; 自由振動実験; 低風速フラッタ; 渦励振; 高風速フラッタ; 空力振; Forced vibration; Free vibration; Rectangular prism; Flow-Induced vibration; Feedback Mechanism; Response characteristics of Oscillation; Suppration of Flow-Induced vibration; Flutter phenomenon; 流体・構造体連成振動; 自由振動実験; 低風速フラッタ; 渦励振; 高風速フラッタ; 空力振

The objective of this study to investigate the feedback mechanism of combined vibration phenomenon of fluid-structure and its control. The rectangular prism with various ratio of depth having a fundamental structure configuration is adopted. The response characteristics of rotary oscillation of the rectangular prism are investigated on the free and forced vibration test. The suppression of the flow-induced vibrations is established by a T-shape plate and a splitter plate attached to the upstream and downstream of rectangular prism. The main results can be summarized as follows.(1) The fluctuating pressure on side surface of the prism except near the trailing edge is generated by impinging leading-edge vortex shed periodically from the leading edge of the prism.(2) Flow-induced vibrations of a prism with B/H=3 is induced by impinging leading-edge vortex and wake vortices. The T-shape plate suppresses the generation of impinging leading-edge vortex and the splitter plate suppresses the g … More eneration of the wake vortices.(3) The fluctuating moment of the prism with splitter plate is almost same to the plain prism. However, the fluctuating moment of the prism with T-shape plate greatly decreases in comparison with the plain prism. Therefore, it is recognized that flow-induced vibrations of the prism are strongly dependent on the impinging leading-edge vortices rather than the wake vortices.(4) The work done by fluctuating moment of the plain prism and the prism with splitter plate becomes a positive within forced oscillation frequency Sv<1.0 and flow-induced vibration diverges. On the other hand, the work of the prism with T-shape plate becomes almost zero value in the range of Sv=0 to 0.06. And the vibration converges because the work is negative in the range to Sv=0.23.(5) From the free-vibration test for the plain rectangular prism with impinging leading-edge vortices, it is found that there exists three types of flow-induced vibration, I.e., low-speed torsion flutter, vortex excitation and high-speed torsion flutter.(6) The vortex excitation is suppressed when the splitter plate is attached at the downstream of a prism. The low-speed and the high-speed torsion flutter and the vortex excitation are suppressed when the T-shape plate is attached at the upstream side. Therefore, suppression of the flow-induced vibrations of the prism is done with the most effectiveness when the impinging leading-edge vortices are suppressed with the T-shape plate. Less

这项研究的目的是研究流体结构及其控制的组合振动现象的反馈机制。采用具有各种深度比率具有基本结构配置的矩形棱镜。在自由振动试验中研究了矩形棱镜旋转振荡的响应特征。流动引起的振动的抑制是通过T形板和附着在矩形棱镜上游和下游的分离板确定的。 （1）棱镜侧面表面的波动压力可以总结，除了在后边缘附近，通过撞击棱镜前缘的前沿脱离的前沿脱落而产生。（2）通过撞击B/H = 3的流动诱导的棱镜振动，通过撞击前沿式边缘vortex和Wake vortex and Wake vortex and Wake vortex and Wake vortices。 T形板抑制了撞击前沿涡流的产生，而分离板抑制了g…更多的尾流涡流。（3）用分离板的棱镜的波动时刻与平原棱镜几乎相同。然而，与普通棱镜相比，用T形板的棱镜的波动瞬间大大降低。因此，人们认识到，棱镜的流动引起的振动很大程度上取决于撞击前缘涡流而不是尾流涡旋。（4）（4）通过透明棱镜的波动时刻和用拆分器板的棱镜在强迫振荡频率SV <1.0和流动诱导的振动振动介绍中所做的工作变得很积极。另一方面，在SV = 0到0.06的范围内，具有T形板的棱镜的工作几乎变为零值。振动的收敛是因为工作在范围内为负到SV = 0.23。（5）从平淡的矩形Prism的自由振动测试中，构成了前沿涡流，发现存在三种流动诱导的振动，即低速旋转，涡旋式兴奋和高速造成的Trame tripter trabters trabters defters trupter flutter flutter flutter fluts。板固定在棱镜的下游。当T形板连接在上游侧时，低速和高速扭转颤动和涡流兴奋会被抑制。因此，当撞击前沿涡流被T形板抑制时，对棱镜流动诱导的振动的抑制是最有效的。较少的