... a nonlinear frequency-domain approach to analyze the system's dynamics. Symmetrically arranged HAM devices are modeled as Jenkins friction elements. Using the harmonic balance method, the HAM control force is approximated as stiffness and damping, both dependent on wave frequency and amplitude, forming...

... the continuity conditions at the junction nodes, the final governing equation of the whole structure is assembled. Two types of frequency response functions are chosen as the cost functions and the optimal control force corresponding to every control strategy is derived. Numerical analysis is conducted...

... wind turbine subsea system structural control mass block wind speed control force dynamic response ABSTRACT The load shedding control of offshore floating wind turbine (OFWT) under the action of wind and wave is studied. A three-degree-of-freedom model is established for a wind turbine...

... subsea system constraint control force thrust allocation strategy optimization problem azimuth angle allocation artificial intelligence upstream oil & gas thruster extreme operating sea condition allocation result allocation algorithm red zone saturation protocol power...

... theory, ASAC methods can be divided into two category: One method is based on the vibration mode of structure. The control of sound radiation from structure by vibration mode utilize the mechanism of modal suppression, the control force was put on the position of maximum responses of vibrate to suppress...

... strategy platform chunyan ji huajun li artificial intelligence frequency effectiveness control algorithm weighting function control force control strategy upstream oil & gas engineering frequecy offshore platform qingdao qingdao Optimal Vibration Control Strategy for Offshore Platforms...

... computer simulations" (i) where a control force cancels the time-invariant reactive terms in the device dynamics, and (ii) where an additional control force derived f rom predictions of device velocity attempts to match the time-varying radiation impedance of the device. An Auto- Regressive (AR) model...

..., which was connected to the ship through a linear actuator, providing a control displacement for the system. The active control theory (Optimal Regulator Theory) was applied to the system, and the optimal control force for the actuator to provide the control displacement was determined for various...

.... Pipe and ship are dynamically positioned to follow the moving miner during the mining operation (Chung and Tsurusaki, 1994). soil friction force variation vehicle vector friction force control force hydrodynamic drag sltc algorithm artificial intelligence simulation operation track...

... and nonlinearity of hydrodynamic force may make the result of conventional optimal control inaccurate. In adaptive control, hydrodynamic terms like added mass and drag coefficient in the riser dynamics are identified and control forces on the floating body and riser are calculated simultaneously. An adaptive...

... evaluation but also the reduction of the responses. reservoir characterization active control force effect tmd system control force equation time history control method denote offshore platform dynamic response artificial intelligence superstructure active control force upstream oil...

... and the riser are protected from structural damage. The low-frequency motion is induced by small wave drifting force and can be controlled by small control force. The first order wave force is very large and control of this high-frequency response is not practical. The control method is optimal control...

... deformation sway displacement current velocity simulation equation artificial intelligence expenment nser thruster real system control force riser lower end line show water depth deflection automatic reentry system experiment upstream oil & gas displacement Proceedings of the Fourth...

.... Although the active control method requires some external forces on the structure, but it will provide more effective reductions of the dynamic responses. In this study, the TMD system subjected to the active control force is applied for the reduction of the dynamic response of the jacket type offshore...

... reduction of dynamic responses. wave force reduction natural frequency weighting coefficient displacement response offshore structure control force response reduction artificial intelligence mean wave period active control force dynamic response frequency active control method dominant...

... controlled trajectory tracking ability of ROV will dramatically reduce the load on operator. In transporting stage, operator have only to give information about trajectory to ROV. This enables the long time operation in deep waters. One problem arisen computer vector control force transducer...