Finite Element Analysis Of Dynamics Of Helicopter's Tail Transmission

Helicopter is widely used for its flexible and hovering, No matter in military use or civilian use, the research on the helicopter has been highly valued and become important problem in many countries. In the transmission system of the helicopter, it is very important to transmit power to the tail rotor. The key technique to improve the helicopter's capability is to accurately predict the dynamic response of the tail transmission.Firstly, based on the elasticity theory and finite element analysis theory, this paper discussed the design feature of the helicopter tail rotor transmission system, and built the parameterized finite element model of the main parts of system by using ANSYS. The equivalent dynamic characteristics parameters of joints were researched, and the finite elements model of the combined frame was built up using spring elements. While the parameters of the system were inputted in parameter text, it obtained the parameterized model of the helicopter tail rotor transmission system.Secondly, the dynamic mode analysis was done for the parameterized model, and obtained the natural frequency and the vibration mode of flexural vibration and torsional vibration. Then, discussed how the parameters exercises influence on the natural frequency and the vibration mode.Finally, the special interface of ANSYS for the APDL parameterized program of the helicopter tail rotor transmission system was designed by UIDL language. The special interface could be inputted the parameter and obtain the parameterized modeling. Later on, it could call the APDL program of tail rotor transmission system. This method provided the convenience for design and analysis and substantial fundament for static and dynamic transient analysis.