空気流体振動現象を対象としたリアルタイムハイブリッド式実験法とその応用

概要

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In the present papers, we propose a new approach for simulating the aerodynamic vibration of structures in a wind tunnel and discuss its application. The concept of the proposed approach is a step-by-step computer simulation using the measured external wind force acting on a structural model in the air flow of a wind tunnel. This approach is referred as to the Modified Hybrid Aerodynamic vibration Technique (MHAT). At first, the concept and advantages are explained. In the next place, the development of a simulation system based on this approach and the accuracy of this system are described. In additional, the outline of conducted simulation by means of this approach is indicated. In order to demonstrate the application of MHAT, two simulations are performed. First, the aerodynamic vibration of a square prism on a single-degree-of-freedom elastic model is simulated in three-dimensional flow. Then, the air pressure field acting on the model is analyzed by means of the Proper Orthogonal Decomposition. Second, the aerodynamic vibration of a square prism is simulated using a multi-degree-of freedom elasto-plastic model. These simulations prove the broad applicability of MHAT. In additional, it is discussed whether MHAT can simulate the vibration of structures in liquid sodium even under in air flow or not.