A Method to Integrate Drive System Design

A rotorcraft drive system is a complex and tightly coupled system. The integration of such a system requires an understanding of the multi-disciplinary interactions that occur during design. The function of the drive system is to transfer engine power, with speed reductions to the lifting rotor, anti-torque device, and other accessory systems, while minimizing transmission power losses. This paper discusses a method to lessen the complexity of design due to tight coupling. Through digitization of geometry and data, interfaces are created to design the systems jointly. The preliminary design of the drive system takes into consideration the vehicle concept, power requirements, airframe layout for engine and transmission housing, and gear optimization. Higher fidelity gear design using FEA and application of topology optimization are also discussed.