The Helicopter Main Blade Fatigue Test System Dynamic Characteristics Anslysis

As the most critical one of several major components of the helicopter, rotor blades go with long-term exposure complex cycle alternating load, so the performance of the rotor blades affects the overall performance of the helicopter directly, also related to the safety of flight. Currently,An effective way to solve this problem is to obtain the fatigue performance of the blade through the fatigue test. Thus, mechanism and dynamics fatigue test rig affect the assessment of the fatigue properties of the blade directly. This topic research the helicopter main blade fatigue test system mainly from two aspects. Firstly, start from finite element analysis of dynamic simulation module and erect the finite element model of helicopter main blade fatigue test system; Secondly, erect the mechanical model of helicopter main blade fatigue testing system based on the kinetic theory. Finally, provide a theoretical basis for improving helicopter main blade fatigue testing system by comparing the results of the analysis.This paper establish the helicopter main blade fatigue test system theoretical mechanical model through the kinetic theory, four mechanical models were built during the course of theoretical modeling, obtain the comparative analysis of the advantages and disadvantages of these four dynamic model s. Then introduces the basic theory and basic principles of the finite element dynamics simulation analysis, starting from the finite element software ANSYS, simulation analysis be applied on helicopter main blade fatigue test system then establishing the dynamic model, analyzing from three aspects: model analysis, harmonic analysis, and transient kinetic analysis and getting the first six natural frequencies of this system, amplitude-frequency response curve and kinetics curve. Finally, analyze this system natural frequency vibration mode diagrams and steady vi bration response with the fourth mechanical model. Theoretical analysis fit the simulation results well, verifies the validity of this project in the finite element analysis model well and provide a strong basis of the kinetic theory for optimizing and improving the follow-up helicopter main blade fatigue test system.