Analysis Of Transient Response Of Helicopter During Rotor Start On Ground

The helicopter's rotor start on ground is one of the most important processes before the helicopter taking off on ground , which attracts many people's attention.In the dissertation, the transient response of the nonlinear aeroelastic system coupled by the helicopter's rotor and fuselage was researched and analyzed when the helicopter's rotor started on ground, and the transient response of this system was also visualized in this process, which is helpful for further study on the stability of helicopter during its rotor started on ground.In the second chapter, a nonlinear aeroelastic model for analyzing the helicopter'transient responses of rotor and fuselage dynamics coupling was established based on multi-body analysis with the effects of variations both rotation speed and pitch considered, and then, the dynamics equation was also set up. After that, the stability of nonlinear aeroelastic model was studied with the method of eigenvalue . In the third chapter, the transient responses of all the system's freedoms were simulated and analyzed successfully before the helicopter taking off on ground with all kinds of controls in practice, and the simulation results were also analyzed and compared.In order to reflect the transient responses of rotor and fuselage dynamics coupling system intuitively for helicopter's ground drive, in the fourth chapter , visualization research was done based on the language of Visual Basic and OpenGL, and the visualization software for the helicopter's rotor start on ground was designed with detailed instructions.