Abstract
In this study, the optimal mechanical design method for model of fixed-pitch coaxial-rotor helicopter is proposed. The fixed-pitch coaxial-rotor helicopter has several advantages compared with other type helicopters. For example, it has great simplicity of the mechanisms, well maintainability, and well energy conversion efficiency, and so on. However, fixed-pitch coaxial-rotor helicopter has a drawback in forward flight named pitch-up phenomenon. Pitch-up phenomenon causes a little cruise speed of the helicopter, and it is fatal problem. To overcome such a problem, optimal mechanical design of the fixed-pitch coaxial-rotor helicopter is proposed. The optimal design is based on the precise mathematical model and numerical optimization method. The mechanical parameters are examined to maximize the cruise speed of the helicopter model. Mechanical parameter optimization based on mathematical model and Particle Swarm Optimization (PSO) method is proposed. The fundamental optimization of mechanical parameter is performed to show the validity of proposed optimal design method.
