Linear active control of articulated tower

摘要

Three strategies for the linear active control of the nonlinear response of an Articulated Leg Platform (ALP) are presented. The first control strategy obtains the control law based on the initial (structural) damping and stiffness of the system. All the nonlinearities are brought to the right hand side load term. In the second and third strategies, a part of the hydrodynamic damping is used in deriving the control forces. In particular, the second control strategy obtains a linearized drag solutio. An iterative frequency domain technique is used to obtain the controlled and uncontrolled responses. The rms and peak responses obtained by different control strategies, are compared for an ALP under a random sea state.