State-of-the-Art On-Deck Dynamic Interface Analysis

Dynamic interface analysis involves the investigation of all aspects of integrating helicopter and ship operations that are related to the effect of ship motion. Specifically, it includes analysis of the approach, hover and landing, and on-deck securing and handling phases of aircraft operation. This paper identifies the important role of both ship and embarked aircraft simulation and focuses on several key elements. These include essential ship motion simulation and analysis capabilities; the structure of the nonlinear governing differential equations describing the 15-degree-of-freedom model required to simulate the aircraft/ship system; detailed modelling of the characteristics of suspension stations including kinematics, nonlinear oleo characteristics, and an intermittent contact tire model; and the importance of accurate modelling of aerodynamic forces including drag forces and induced rotor loads. Discussions are supported by a summary of wind tunnel measurements of induced rotor loads resulting from preliminary collaborative wind-tunnel testing conducted at the National Research Council of Canada Institute for Aerospace Research and sample results drawn from current dynamic interface analyses investigating various aspects of dynamic interface behaviour. An indication of the direction of continuing research and development is also included.