A Helicopter Main Gear Planetary Drive System Dynamics Modeling And Analysis

Helicopters are widely used in military, scientific research, disaster relief and otherfields, has a pivotal role in national security and economic development. Planetarygear transmission as one of the important parts of the helicopter main gearbox, thevibration and noise become the key factor affecting the reliability of the transmissionsystem, the life and work environment.Although the dynamics of the development has been a long history, but itsapplication in particular, on the planetary gear system gear system is only still in thetheoretical stage, almost no real use on the actual product, which is used in thehelicopter is few. Because of the special nature of the helicopter, the dynamics of thetransmission planetary gear train to increasingly demanding higher. In this paper,existing in a certain type of planetary gear reducer helicopter main source parameters,the planetary gear train dynamics research and analysis of the dynamics of planetarygear transmission system improvements for the planetary gear train design andmanufacturing to provide a theoretical the basis to achieve the effect of reducingvibration and noise. The main contents are as follows:1. An in-depth study of planetary gear train helicopter amendment to reverse themodel and use it to study the natural frequencies and mode shapes of planetary geartrain, got two kinds of classical planetary gear train vibration modes, and weresupported from the torsional stiffness of the ring gear, planetary axles gear bearingstiffness and stiffness of the three aspects of the planetary gear train natural frequencyis analyzed.2. At the basis of pure torsional vibration model, are described varying meshstiffness, backlash, and comprehensive engagement of calculation errors and othernonlinear factors, and these factors into account nonlinear planetary gear train so as toestablish a non-linear vibration dynamics model.3. Using variable step size fourth-order Runge-Kutta method for solving equations,respectively, from the damping, stiffness, dimensionless speed, backlash, etc. Studythe dynamic characteristics of the planetary gear system.