Jixie chuandong (Dec 2022)
Dynamic Analysis on the Transmission Gear System of the Cutter Head Main Drive of Large Shield Machines
Abstract
Aiming at the transmission gear system of the head main drive of large shield machines with a diameter of 16 m and in order to explore the dynamic characteristics of the multiple sources parallel drive transmission gear system (including 16 groups of power sources) under real driving conditions, an equivalent dynamic model of 68 DOF bending-torsional coupling of the main drive gear system of the large scale shield machine is established using the lumped parameter method. Considering the influence of the nonlinear factors such as time-varying meshing stiffness, gear transmission error and gear clearance, the model analyzes the time-frequency dynamic response characteristics of the transmission system under the action of multi-source driving torque in actual driving conditions. The results show that the vibration frequency of the system mainly consists of gear meshing frequency and its frequency doubling, and the maximum value of dynamic meshing force occurs at the frequency doubling of corresponding meshing frequency. The amplitude of gear vibration and its meshing force are obviously affected by the input torque fluctuation of hydraulic motors.
