谐波齿轮传动柔轮变形与变形力研究

针对新型弹性波发生器的提出,建立了谐波齿轮传动柔轮变形与变形力的计算模型,并对XB1-100-80机型的柔轮进行了变形量与变形力测试实验,通过对测得的实验数据进行拟合分析,对柔轮变形与变形力的计算模型进行了修正,为新型弹性波发生器的设计提供了理论依据.     

凸轮波发生器作用下柔轮截面应力有限元分析

建立了柔轮在凸轮波发生器作用下的有限元模型,进行了静力学接触分析.深入地分析了柔轮在凸轮波发生器作用下的截面应力特征,找出了柔轮的危险截面,得出在凸轮波发生器作用下危险截面是离端面距离为14.4 mm的截面的齿槽部分,为谐波齿轮传动的设计提供了重要的依据.     

Nonlinear dynamic analysis of an external gear system with meshing beyond pitch point

Journal of Mechanical Science and Technology - A two-dimensional non-linear dynamics model of a gear with meshing beyond pitch point with six degrees has been established, considering time-varying...     

Total harmonic distortion of a pseudosinusoidal signal of an arbitrary wave form generator

In its simplest shape, the pseudosinusoidal signal given by an arbitrary wave form generator is constituted by a continuation of samples which involve the presence of parasitic harmonics and an increase in its total harmonic distortion (THD) value. It seems evident that the signal shape can be improved by using a linear interpolation between two consecutive samples but, to our knowledge, this improvement is not evaluated quantitatively to date. So, we propose to calculate this THD (according to the number of samples used to build the signal) with or without linear interpolation. SPICE simulations and experimental results agree with theory.     

谐波齿轮传动柔轮的变形分析

柔轮是谐波齿轮传动装置的主要部件,柔轮的变形直接影响柔轮的应力、寿命及谐波齿轮传动机构工作的可靠性.本文通过理论推导,建立了双波谐波齿轮传动环形柔轮变形量、截面弯矩的计算模型,提出了柔轮变形敏感度的概念,并对柔轮变形的敏感度与中性层曲率半径变化进行了仿真,得出了柔轮齿数的合理取值范围及柔轮圆环危险截面的位置,可为柔轮的性能分析、改进设计提供参考.     

齿轮基体的柔性变形分析

轮齿重复受载后,轮齿就会变形,并逐步扩展,致使轮齿疲劳折断。采用有限元仿真软件ANSYS,研究齿轮在受载时的柔性变形[1]。为齿轮结构优化设计、抗断裂设计和安全设计打下基础。     

Investigation of a flea gear tooth modification

Journal of Mechanical Science and Technology - Gear has been considered as the greatest invention of human elements. One always believed that gears were man-made products, since there was...     

Design and construction of a temperature wave generator

A sinusoidal temperature wave generator has been developed and constructed. It consists of a cold plate, a heating coil, and an electronic feedback control with a thermocouple sensor. The design criteria, heating and cooling calculations, and electronic and mechanical construction details are presented and described. Results are shown, and possible modifications are discussed.     

基于外部链接的通用法兰生成器的研制

提出了一种集成于AutoCAD环境的计算机辅助法兰图形生成方法,并对数据组织、程序结构和界面设计等方面的问题进行了探讨。     

Experimental analysis of the flow dynamics in the suction chamber of an external gear pump

Time-Resolved Particle Image Velocimetry (TRPIV) has been used to investigate the flow inside the suction chamber of an external gear pump where the movement of the fluid through the pump is maintained by the rotation of the gears. The main purpose of this paper is to study the characteristics of the complex flow pattern of this pump system in order to help in improving its total performance. The applied experimental techniques establish a method that allows visualising the flow inside the gear pump with a high rotational velocity system. Small micro air bubbles have been used as flow seeding. The images have been processed using domestic PIV software that uses specific aspects of the TRPIV technique. Instantaneous and phase-locked ensemble average fluid motions have been obtained for different gear pump rotational velocities to investigate the turbulence effect of rotating gears to the system.     

齿轮啮合弹性变形的动力学分析

齿轮啮合传动过程中轮齿产生弹性变形，从而引起振动，用一与轮齿啮合点处的法线相重合的弹簧表示这一弹性变形，建立了该系统的数学模型，分析了这一参数激励和强迫振动并存系统的稳定性。     

An analysis of external spline gear forming by an upper bound energy method

Closed-die forging of external spline gear forms is analysed using an upper bound elemental energy method. The kinematically admissible velocity field for the three-dimensional deformation was obtained on the assumption that the profiled surface of the tooth was straight but tapered. The upper bound to the deforming load necessary and the deformed configurations are predicted using integration of the formulation of energy expressions which were obtained from the presented velocity fields. Two different forging methods denoted here as A, viz. a side extrusion method and B, an upset forging method, the details of which are given in the text, were considered in the present analysis and the theoretical results compared with experimental ones. Experiments were carried out on plasticine as model material at room temperature where talcum powder was used as a lubricant. The present investigation revealed that the analytical method B predicts a reduced forging load and improved configuration better than method A for the forged products.     

Small-scale characteristics and turbulent statistics of the flow in an external gear pump by time-resolved PIV

Recent technology advancements in Particle Image Velocimetry (PIV) technique offers a new possibility to study the complex turbulent flows over a wide range of scales. It can be used for the estimation of the turbulent kinetic energy dissipation rate including spatial derivatives of the velocity fluctuation components. In this study the flow characteristics of an external gear pump were studied with time-resolved Particle Image Velocimetry. Measurements were performed for two different spatial resolution configurations and various interrogation areas to estimate the dissipation rate of the turbulent kinetic energy. Results show that the spatial resolution is a critical factor in the accuracy of the measurements in the dissipation rate estimations. The optimal results can be achieved if the interrogation area is neither too large (sampling phenomenon) nor too small (noise in the measurement data). The effect of number of samples employed in the ensemble-averaging was considered as well.     

螺旋锥齿轮铣齿机结构发展的研究

介绍螺旋锥齿轮铣齿机的切齿原理和结构演变历程,并对其各自的优缺点进行了比较。为该类机床的设计提供了理论依据。     

基于完全封闭解的外啮合齿轮泵运动学流动特性分析

该文运用封闭式的流量方程研究了外啮合齿轮泵的流动特性.对带有和不带有缓冲槽的外啮合齿轮泵的流量和流量脉动系数进行了计算和比较.最后讨论了设计参数齿数和齿顶高系数对外啮合齿轮泵的流量特性的影响.     

Formation of finely dispersed emulsions in a flow wave generator with oils of various viscosities

This study is devoted to the improvement of planar-type generators for obtaining the finely dispersed and homogeneous emulsions from concrete immiscible liquids. The results of the experimental investigation on the influence of oil viscosity and surface vortex generators on the formation of a uniform finely dispersed water-oil emulsion in the planar-type flow wave generator are presented. The new experimental data on the development of emulsions for concrete components of immiscible media are presented.     

使用二级脱盐水时外啮合齿轮泵端面间隙的确定方法研究

该文通过对二级脱盐水水质标准、二级脱盐水在液压传动中使用特点进行分析,研究探讨使用二级脱盐水时外啮合齿轮泵齿轮端面间隙的确定方法.     

基于Matlab的外啮合齿轮泵结构优化

以体积最小为目标函数,建立了满足一定约束条件的外啮合齿轮泵的优化设计数学模型.在此基础上编制了m文件,利用Matlab优化工具箱对齿轮泵结构参数进行优化,并对优化结果进行了分析.结果表明,与原结构相比,优化后的齿轮泵重量减轻了27.52%,可大大降低制造成本.