Study On Dynamic Response Of Transmission Shaft System Under Impact Load

The shaft drive mechanism is usually designed according to the maximum steady-state static strength under normal use specifications,that is,under the assumption of steady-state operation,the drive shaft system is designed and calibrated according to the maximum effective static strength and safety factor.In actual construction machinery design,such as stone crusher size irregular shape of the incoming material,wind generator impeller rotation in the transient wind,airborne gas turbine generator set transient high power load loading and ship propeller contact impact conditions,will produce a large impact load in the drive shaft system,especially for high speed small power rotating equipment is more obvious.The transient shock load will far exceed the strength design margin,resulting in torsional deformation of the drive shaft and even fracture in severe cases,affecting the safety of the entire system.Therefore,the strength design and calibration of the drive shaft system should take full account of the impact of the shock loads that may exist in the actual operating conditions.To address the problem that the traditional rigid body static strength analysis method does not reflect the actual load bearing condition on the drive shaft system,this paper takes a typical second order reduction system’and a typical shock load source-variable speed and constant frequency alternator as examples to carry out research on the dynamic response and strength analysis method of the drive shaft system under shock load.Firstly,applying the principle of elastic mechanics and the moment balance equation of the transmission shaft system,the dynamics model of the drive shaft system as a whole was established.A simulation model of the dynamic response of the drive shaft system was built in MATLAB/Simulink.The dynamic response of the drive shaft system to the impact load under transient loading and the influence of the drive shaft parameters on the impact load are analysed.The dynamic response of the drive shaft system under transient loading and the influence of the drive shaft parameters on the impact load are analysed.Secondly,in order to study the dynamic response of the drive shaft system under real shock loads,this paper selects an aviation variable speed and constant frequency alternator as a typical shock load source,establishes a mathematical model of the variable speed and constant frequency alternator,builds a Simulink model of the dynamic performance and torque calculation of the variable speed and constant frequency alternator,and studies the influence of the variation of the generator body parameters on the shock load.Thirdly,integrating the drive shaft system and the variable speed and constant frequency alternator model,this paper builds an overall Simulink model of the airborne power generation system and simulates and analyses the dynamic response of the drive shaft system under impact loads under various operating conditions;and builds an airborne power generation system simulation and calculation software based on the MATLAB/GUI module.Finally,for the damage form of transmission shaft system under impact load,this paper researches the strength analysis method of transmission shaft system under impact load based on ANSYS workbench,the analysis shows that: the traditional static strength design method of transmission system shaft system subjected to impact load will not meet the requirements of shaft strength design,in the design of transmission shaft,according to the dynamic response of impact moment on transmission shaft and its In the design of the drive shaft,the frequency and the equivalent force in the weak link of the drive shaft should be calculated according to the dynamic response of the impact moment on the drive shaft and its mode,as a basis for the strength design of the drive shaft.The dynamic response of the drive shaft system under transient loading and the strength analysis method of the drive shaft under impact loading used in this paper can be used as a reference for the strength design of similar drive shaft systems.