Boundary control for floating beam system in irregular waves under one end pinned to reduce hydroelastic response

Abstract

The structural stability is of great importance in research and development of very large floating structure (VLFS). The vibration reduction on VLFS would not only prevent the structural fatigue but also improve the platform serviceability. In order to reduce the hydroelastic response on VLFS in the actual ocean environment for better land use, especially on the area close to boundaries, we investigate a boundary control method for a floating beam system with irregular waves in this paper. Through utilizing Lyapunov direct method, a boundary controller is proposed to reduce the hydroelastic response of the floating beam system restrained at its downstream end. The numerical simulation with experimental calibration is given to verify the effectiveness of the suggested control strategies on the floating beam system. Then, we further investigate the hydroelastic performance of floating beam system under boundary control with various wave amplitudes and bending stiffness. The results demonstrate that the boundary control method could be a potential solution to improve the serviceability of the system in the actual uncertain ocean environments.