抄録
In this paper, the stability and mitigation of the vibration of the structure subjected to annular flow is investigated when the parameters of structure and fluid have uncertainness. Equation of motion of structure is given by Euler-Bernoulli type partial differential equation with uncertainness. Equation of motion of fluid is given by Navier-Stokes equation with uncertainness. The fluid-structure coupled equation with uncertainness is derived from these equations. By drawing root locus of the coupled equation, the stability of the coupled system with uncertainness is investigated. Since the parameters of structure and fluid have uncertainness, the critical flow velocities change. Furthermore to reduce the coupled vibration of the system with uncertainness, the robust control is employed here. By this control, the system with uncertainness is stabilized. In the result, the critical flow velocities are increased.
