Development of an adaptive disturbance rejection system for the rapidly deployable stable platform—Part 2

VanZwieten, Tannen S.; VanZwieten, James H.; Balas, Mark J.; Driscoll, Frederick

doi:10.1016/j.oceaneng.2010.07.005

Cited by 3 publications

(1 citation statement)

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“…This was previously applied to the RDSP without the inclusion of frequency synthesis for wave and load disturbance rejection in [11][12][13]. The concept of augmenting the algorithm with a PLL in order to reject disturbances at coarsely known frequencies was considered in [7,14], and applied to a simplified 1-DOF RDSP simulation.…”

Section: Introductionmentioning

confidence: 99%

Direct Adaptive Rejection of Vortex-Induced Disturbances for a Powered Spar Platform

VanZwieten

Balas

et al. 2009

Volume 5: Polar and Arctic Sciences and Technology; CFD and VIV

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The Rapidly Deployable Stable Platform (RDSP) is a novel vessel designed to be a reconfigurable, stable at-sea platform. It consists of a detachable catamaran and spar, performing missions with the spar extending vertically below the catamaran and hoisting it completely out of the water. Multiple thrusters located along the spar allow it to be actively controlled in this configuration. A controller is presented in this work that uses an adaptive feedback algorithm in conjunction with Direct Adaptive Disturbance Rejection (DADR) to mitigate persistent, vortex-induced disturbances. Given the frequency of a disturbance, the nominal DADR scheme adaptively compensates for its unknown amplitude and phase. This algorithm is extended to adapt to a disturbance frequency that is only coarsely known by including a Phase Locked Loop (PLL). The PLL improves the frequency estimate on-line, allowing the modified controller to reduce vortexinduced motions by more than 95% using achievable thrust inputs.

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