柱状海洋構造物の振動制御

概要

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In the design of an off-shore tower-like structure, which consists of two pipe sections assembled with universal joints and attached to a buried sinker block on the sea bed, enough buoyancy can be provided to keep the structure vertical. It is desirable to reduce both the structural oscillations due to random wave excitation forces and the reaction forces acting on the sinker block. Assuming that the motion of the structure is two-dimensional in the vertical plane, these design requirements can be effectively satisfied if appropriate restoring and damping coefficients are provided at the joints. In this study, we employed the statistical equivalent linearization technique to linearize a nonlinear fluid drag force, and applied a sub-optimal control theory with control structural constraints to obtain the optima stiffness and damping coefficients required at the joints after a trade-off between the rms values of the top displacement of structure and the rms values of control moments at the joints.
一般社団法人日本機械学会の論文
1988-07-25