制御板を用いた正方形柱のインライン流力振動の制御

抄録

This study investigated the phenomenon that a square prism, which is one of the structural elements, vibrates in the flow direction. By attaching a control plate to the corner of the surface of the prism, the vibration was controlled by a method of controlling the flow of separation from the object. In the experiment, the test model was installed in the in-line free vibration experimental device in the wind tunnel, and the fluid dynamic response characteristics were investigated by changing the length and mounting method of the control plate in various ways. In addition, the length and mounting method of the control plate that effectively suppresses the occurrence of vibration were examined. The test model is elastically supported at it's both end and is restricted to vibrate in only in-line direction. Instantaneous displacement of test model was measured by means of Laser Displacement Anemometer, and degree of vibration was evaluated by rms value of the fluctuating displacement. As a result, it was found that the vibration effect obtained differs depending on the mounting method, length, and angle of attack of the control plate. Therefore, the method used in this study can suppress the displacement of flow-induced vibration in the inline direction.