发动机激励下行星传动非线性啮合力特性  

Study on Nonlinear Meshing Force Dynamic Behavior of Planetary Gears on Engine Excitation

作　　者：刘辉[1,2] 蔡仲昌[1,2] 项昌乐[1,2] 

机构地区：[1]北京理工大学机械与车辆学院北京,100081 [2]北京理工大学车辆传动国防科技重点实验室,北京100081

出　　处：《振动．测试与诊断》2014年第1期83-89,191,共7页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(51375047,51075033)

摘　　要：建立了发动机波动转矩激励下的行星传动纯扭非线性振动模型,模型中考虑了齿侧间隙、时变啮合刚度及其相位差、综合啮合误差以及各行星轮位置相角时变性。根据信号调制原理,分析了行星排啮合力边频带的产生原因。把发动机转速、转矩分成4种典型工况,在时域和频域内对行星排啮合力进行深入分析。研究表明,啮合力以单边冲击为主,啮频倍频与部件转频倍频调制普遍存在,受发动机工作状态影响相对较小,啮频倍频与波动转矩频率倍频调制则受工作状态影响很大,高速重载时作用最显著。该结论为行星齿轮传动设计提供了依据。A nonlinear torsional dynamic model excited by diesel engine is established,wherein the backlash,time-varying mesh stiffness and its engaging phase difference,gear mesh composite errors and timevarying planet position angle are considered.On the basis of signal modulation principle,the reason of modulation sidebands of planetary gears is analyzed.According to different rotational speed and torque,engine operational terms are categorized into four work conditions.The torsional vibration angle and meshing force are described in details by time history and frequency spectrum.The results demonstrate that meshing force is at single-sided impact state mostly,and frequency modulation takes more great effect on meshing force.Frequency modulation that associates with rotational frequency of parts relative to meshing frequency widely exists in different working conditions,and it does not come under the influence of working conditions.Frequency modulation that associates with rotational frequency of fluctuant torque to meshing frequency is opposite to the former,and it only operates definitively in high speed heavy load condition.It provides reference for the design of planetary gears in automobile transmission.

关 键 词：行星齿轮传动 非线性动力学 啮合力 发动机激励 调制边频带 

分 类 号：TH132.41[机械工程—机械制造及自动化] TB123[理学—工程力学]