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A large number of maritime structures used for commercial, exploration and military purposes are equipped with a helicopter landing deck or winching area, respectively. Offshore flight operations are a highly complex and specialized process. It requires high levels of training, competence and skill to plan a flight, land and takeoff from an offshore installation even in good weather flying conditions. These operations can be seriously degraded by environmental effects that may be present around installations, vessels and their helidecks. The effects of wind turbulence from topsides structures or hot gases cause difficult landings and temporary loss of aircraft control by the pilot. Hot exhaust plumes from gas turbines on an installation can affect helicopter performance. The power output of the turbine engines on a helicopter is reduced as the air temperature at the intake increases. Rapid temperature changes can also induce engine surge and even compressor stall or flameout. The low cloud at helideck and other weather conditions affect visibility. The wind and wave induced dynamic motions on helidecks, on floating installations and vessels which represent a potential hazard to helicopter operations. Therefore, development of new equipment and technologies are required in order to ease helicopter crew with the execution of flight operation. Aiming at assists pilots in these flight operations, we propose a new approach using an active helideck. Active-helideck based on Stewart-Gough platform is designed, developed, computational simulated and tested as a helicopter floating helideck. The objective of this testbed is to show the advantages of helicopters that use an active helideck upon landing on and taking off from ships or from offshore structures. Active-helideck compensates simulated movements of a ship at sea. The main goal of this study is to maintain the robot's end effector (helideck) in a quasi-static position in accordance to an absolute inertial frame. Compensation is carried out through the coordinate action of its six prismatic actuators in function of an inertial measurement unit. Moreover, the simulation of the sea movement is done by a parallel robot called ship platform with three degrees of freedom. A Computed Aided Engineering (CAE) system is used for modeling, simulation and analysis before construction testbed. The ship platform is 6

Robotic Strategies to Assist Pilots in Landing and Takeoff of Helicopters on Ships and Offshore