2721 2自由度振り子の非線形相互干渉を考慮した渦励振の数値シミュレーション(J20-5 流体関連の騒音と振動(5) 流体連成振動の解析法,ジョイントセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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The purpose of this research is to investigate the self-induced oscillation of blunt bodies due to Karman Vortex Street and to invent an effective way to prevent the body from getting the oscillation. Most engineering problems occur at the systems with multi degrees of freedom or the elastic bodies. Thus, we selected a double pendulum as a body influenced by the fluid. If the body of the pendulum executes the plane motion, then the system is a two degrees of freedom. Our pendulum consists of an elliptic cylinder and a string. We solve the Navier-Stokes equations by the FDM (Finite Difference Method), and the ALE (Arbitrary Lagrangian-Eulerian) method is applied to the moving-boundary problems. An interpolation scheme is adopted to the convective term of N-S equations. We show that two different oscillation-modes of the system induced by vortices at wake.
社団法人日本機械学会の論文
2008-08-02