Influence of shaft torsional stiffness on dynamic response of four-stage main transmission system

Dynamic response analysis has potential for increasing fatigue life of the components in the transmission of a multi-stage main transmission system. The calculated data can demonstrate the influence of shaft torsional stiffness on dynamic characteristics of the system. Defining key shafts corresponded by each branch of the system and analyzing its sensitivity are important for the design of four-stage deceleration helicopter. Lumped mass method is applied for dynamic modelling and Fourier method is used to solve differential equation of the system. Results of the analysis indicate key shafts can be designed carefully to improve the performance of the transmission system