齿轮变位对传动振动的影响

本文就齿轮变位对传动振动的影响作了分析，探讨了通过选择适当的变位形式与变位系数降低传动振动的方法。同时还作了模型试验，试验结果与理论分析结果基本吻合。     

基于ADAMS的行星齿轮传动系统运动学仿真分析

介绍了ADAMS的功能、特点以及建模方法，利用ADAMS对行星齿轮运动学仿真分析，得出速度曲线，进而分析行星齿轮传动系统的运动平稳性，研究行星齿轮传动系统运动学的主要目的，就是确定行星齿轮传动系统中各构件间的传动比和各构件的加速度通过上述过程，对系统的仿真分析，进行系统科学试验的研究全过程，使得大量的成品的缺陷在未成型之前就得到处理，从而大大缩短的产品的周期和减低了成本，提高了产品的竞争力。     

PHEV行星齿轮传动系统设计及仿真

分析了并联式混合动力电动汽车(PHEV)行星齿轮传动系统的设计条件,针对条件要求进行了配齿计算,选择了齿轮的主要参数.在并联式混合动力电动汽车启动加速阶段,利用Simulink软件建立了系统的转速关系、输出扭矩和功率的仿真模型,仿真得出系统的输出转速特性、功率分配特性和扭矩输出特性曲线.结果表明:设计的行星齿轮系统符合PHEV启动加速工作模式的动力分配性要求.     

一种分析行星齿轮变速器的新方法

提出了一种利用波尔(Boo1ean)参数对行星齿轮变速器进行分析的新方法，由于它能将变速器的运动学和动力学方程用一组含波尔参数的代数方程表示，因而，既能使分析过程简化，又特别适用于此类变速器的设计。     

基于键合图的行星变速器动力学研究

在考虑系统的弹性特性、支撑的刚度和阻尼、齿间啮合刚度和阻尼的情况下。建立行星变速器一个档位的键合图模型。用MATLAB／Simulink进行动力学仿真并对其输出结果进行分析。从而为该系统的动力学研究提供一种正确建立模型和仿真分析方法。并为该系统的设计提供参考。     

内齿行星轮传动的平衡

通过对内齿行星轮传动中的三环减速器的平衡分析，构造出了可达到动平衡要求的内齿行星轮传动的设计方案。     

土压平衡盾构减速器三级行星齿轮传动系统动力学特性研究

采用集中质量参数法建立了土压平衡盾构减速器三级行星齿轮传动系统纯扭转动力学模型,模型中考虑了时变啮合刚度、啮合阻尼及传动误差等因素.根据盾构减速器的设计参数,求得了系统的固有频率和振型;使用变步长的Runge - Kutta法求得了传动系统各齿轮的振动位移;计算了各齿轮副的动态啮合力.进行了盾构减速器的振动测试实验,结果表明,理论分析结果与实验数据具有较好的一致性.     

液力变速器行星齿轮传动接触分析

利用三维建模软件UG精确地建立了行星齿轮传动的三维模型,并在分析时进行了相应简化。选定变速器四挡工况,运用ANSYS Workbench对参与传动的P3行星齿轮机构进行静态接触分析和瞬态动力学分析,得到了齿轮啮合的最大接触应力值、轮齿变形量、最大瞬态冲击力以及冲击力稳态值,验证了设计结构强度和可靠性,并与理论结果进行对比验证了软件分析的正确性。     

大型行星齿轮系统可靠性设计的多目标优化

大型行星齿轮传动系统工况复杂,安全性能要求高,常规的设计方法因过于注重安全性,设计的结果偏于保守,技术经济指标不佳.以行星齿轮传动系统为对象,提出了大型机构可靠性设计的多目标优化模型,即以齿轮的关键参数——齿数、齿宽、模数为设计变量,充分考虑工程设计的约束性、多解性等特征,建立数学模型,进行可靠性分析计算,并在MATLAB优化工具箱里采用积极集策略进行多目标优化.将得到的结果与传统设计方案结果相比较,为大型行星齿轮系统的优化设计提供新思路.     

塑料行星齿轮系统振动与噪声特性的研究

为了进一步了解塑料行星齿轮传动系统的传动特性,建立了塑料行星齿轮传动系统的物理模型和实验模型.对塑料行星齿轮传动在不同工况下的振动特性及噪声特性进行了研究.研究结果表明:塑料行星齿轮传动的振动主要分布在齿轮啮合基频带及各次倍频、谐频带和转子不平衡频带等;转速和负载的增大加剧了塑料行星齿轮在啮合基频处和谐频处的振动强度;负载的增加会抑制塑料行星齿轮在啮合2倍频处的振动强度;负载和转速的增加会明显的抑制转子不平衡的影响;噪声随着转速的增大而增大,负载的增大会抑制噪声的强度,噪声的峰值与各频带的共振峰值有着对应的关系.     

混合动力行星齿轮动力传动系统方案及参数匹配研究

从混合动力电动汽车需求考虑,对行星齿轮机构的3个基本构件与发动机、电动机/发电机及发电机组成的6种连接方式进行定量分析比较,确定最佳形式,并设计传动系统方案.依据设计目标、4参数控制策略及传动系统结构特点对发动机、电动机/发电机、发电机、电池、主减速器传动比、行星齿轮机构相关参数等进行参数匹配,并在Matlab/Simulink环境下对动力传动系统进行建模仿真,仿真结果验证了方案的可行性.     

等效杠杆法分析行星齿轮传动

利用等效杠杆法^[1],建立了行星机构的转速图,对行星齿轮机构在各种工况下,各基本构件和各行星轮的转速．以及接合元件的相对转速,进行了全面系统的分析.     

Deformability of elements of a planetary gear transmission

An analytical method is outlined for determining the stress state of the pole and satellite shaft in a planetary gear transmission within their contact zone. The influence of these elements on the pliability of the joint and on the directional error of the satellite shaft is established. Measures are proposed for equalizing the loads in the couplings.     

NN型渐开线少齿差行星传动齿轮副的设计

对NN型渐开线少齿差行星齿轮减速器的传动原理、传动特点、齿轮副的主要干涉限制条件、设计参数的选择提出一些看法和认识.提出简明实用的设计计算方法,可简化设计工作,避免反复计算.     

内齿行星轮传动中内齿行星轮个数的选择

通过对内齿行星轮传动静、动态受力分析，研究了内齿行星轮个数与内齿行星轮传动特性的关系。通过分析得知，内齿行星轮个数为3和6的传动是实用的。     

An assemblability check methodology for the kinematic configurations of automatic transmission planetary gear trains

Automotive automatic transmissions typically use a planetary gear train to transmit power at a number of desired output-to-input speed ratios. This is achieved by connecting the gear sets forming the train in various ways as well as connecting certain members to the input and outputs shafts as well as friction elements to hold them stationary. As the gear train is coaxial, the connections between the members of the gear sets as well as input, output and fixed member connections must be planar (i.e. do not intersect) for the transmission to be assemblable. This paper proposes a methodology to perform such planarity (assembly) checks to examine if kinematic configurations of a given concept design for an automatic planetary gear train be mechanically assembled by using a vertex addition algorithm based on graph theory. The proposed methodology is demonstrated through selected planar and non-planar transmission examples.

     

基于层次分析法的行星齿轮传动多目标优化设计

传统的行星齿轮优化一般仅从最小体积出发,其最优解并未考虑对机构其他参数的影响.通过分析行星齿轮机构的多种性能指标,包括外形尺寸、体积、齿面接触强度和齿根弯曲强度,从机构总体最优出发建立模型,采用层次分析法进行多目标优化.结果表明该模型能有效的满足设计要求.     

行星轮边减速器动态接触特性研究

针对新能源车辆齿轮接触特性不明的问题,对新能源车辆轮边减速器动态接触特性进行了研究。首先,基于齿轮接触理论,建立了轮边减速器的三维模型及有限元模型,应用有限元分析软件进行了动态接触仿真分析;然后,将理论计算结果与有限元仿真结果进行了对比,对有限元模型的可靠性进行了验证,进一步对比分析了不同负载、转速对传统燃油和新能源车辆轮边减速器各齿轮最大等效应力、变形量的影响;最后,分析了不同摩擦和刚度对新能源车辆轮边减速器动态接触特性的影响。研究结果表明:新能源车辆轮边减速器各齿轮最大等效应力、变形量显著大于传统燃油车;随负载和转速增大,各齿轮最大等效应力、变形均有不同程度增大,相邻条件转速下太阳轮最大等效应力值增幅达31.2%,太阳轮齿顶变形量增加0.6801 mm;随摩擦和刚度增大,齿轮齿面最大接触应力增大,刚度增大,齿面穿透深度减小。     

Dynamic characteristics of a planetary gear system based on contact status of the tooth surface

Studies on the planetary gear have attracted considerable attention because of its advantages, such as compactness, large torque-to-weight ratio, vibrations, and high efficiency, which have resulted in its wide applications in industry, wind turbine, national defense, and aerospace fields. We have established a novel dynamic model of the planetary gear transmission by using Newton’s theory, in which some key factors such as time-variant meshing stiffness, phase relationships, and tooth contact characteristics are considered. The influences of gear axial tipping, operating conditions, and the meshing phase on the contact characteristics and the dynamic characteristics were researched systematically. It was found that the contact area of the tooth surface was moved due to the axial gear tipping, which obviously affected the meshing stiffness. With the increase in the inclination angle of the sun gear, the meshing stiffness decreases, which produces an evident influence on the high natural frequency in the planetary transmission system. In terms of the dynamic characteristics of the system, the component of rotating frequency appeared in the dynamic meshing force of the sun gear and the planetary gear. Moreover, the floating track of the center wheel varied significantly and exhibited an oval distribution as the inclination angle of the sun gear changed. When the inclination angle of the sun gear increased, the rotating frequency component increased significantly, but the other meshing frequency components remained unchanged; meanwhile, the deformation of the floating track also increased. If the inclination angle of the sun gear changes, the vibration state of the system and the collision impact could become more serious, and the lifetime of the planetary transmission system will reduce. Furthermore, when the load was increased, we found that the gear-tooth contact zone transformed from line contact to surface contact, the meshing stiffness increased, the effect of high natural frequency on the planetary transmission system became more evident, but its low-order natural frequency remained stable. With regard to the dynamic characteristics of the system, the components of the major frequency at the external gearing remained unchanged, but the rotation frequency of the sun gear and the meshing frequency amplitude increased linearly with the increase in load. In conclusion, the variation in the meshing stiffness of the planetary gear system had minor impact on the low-order natural frequency, but had a significant impact on the high natural frequency of the planetary transmission system due to the phase variation of the gear.