航空锥齿轮阻尼环减振作用分析与试验验证

针对航空锥齿轮出现的节径型行波共振问题,通过加装阻尼环对其进行减振,并对减振效果进行仿真分析和试验验证。通过对锥齿轮进行模态分析和振动应力计算,分析附加阻尼环对齿轮行波共振的影响;试验中在齿轮上粘贴应变片,获取齿轮的振动应变。计算与试验结果对比表明,锥齿轮在转速范围内主要存在前4节径行波共振模态,共振转速计算值与试验值误差较小,在共振转速下计算的阻尼减振效果与试验数据接近,满足一定的工程预测要求,验证了该计算方法的有效性,表明附加阻尼环对于行波共振具有良好的抑制作用。

System Life and Reliability Modeling of a Multiple Power Takeoffs Accessory Gearbox Transmission

A mathematical model for system life and reliability of a multiple power takeoffs aeroengine accessory gearbox transmission is presented.The geometry model of gear train is distributed into several subsystems by different transmitted powers.The lives of each component are combined to determine the units,subsystems and entire system lives sequentially according to a strict series probability model.The unit and subsystem interface models are defined to dispose the loads of common components.The algorithm verification is presented and a numerical example is given to illustrate the use of this program.The initial design could not fulfill the life requirement.A design modification shows that the gear train has a more balanced life distribution by strengthening the weak parts,and the overall life of entire system is increased above the design requirement.This program can help the designer to approach an optimal accessory gearbox transmission design efficiently.