基于SolidWorks的齿轮五杆机构运动仿真

齿轮五杆机构作为一种组合机构,在机械设计中应用十分广泛.掌握该机构连杆曲线所具有的性质及影响因素是对机构进行设计应用的前提.基于SolidWorks平台,利用其参数化造型的特点,建立齿轮五杆机构的动态仿真系统,对机构各杆件的长度、初始相位角、齿轮的齿数比等参数对连杆曲线的影响进行了研究.结果表明,齿数比和初始相位角是改变连杆曲线形状的两个重要参数.与传统的图解法和解析法相比,该方法简单高效,通用性和可视性极佳.     

对称双曲柄齿轮五杆机构连杆曲线及其应用

系统地研究了一种特殊的双曲柄齿轮五杆机构——对称双曲柄齿轮五杆机构。首先分析了齿轮传动比和两齿轮的相对初始相位角对这种机构连杆曲线形状的影响 ,进而分析了该机构实现直线轨迹时的运动特性 ,并给出了这种机构的设计方法 ,最后给出了一些应用实例     

混合驱动五杆机构的构型和连杆曲线变化规律的研究

从分析平面五杆机构的相对杆长关系入手 ,给出了平面五杆机构可装配条件及五杆机构中周转副存在的充要条件 ,并据此对平面五杆机构的构型进行了分析 ,得出了平面五杆机构中无条件三曲柄、无条件双曲柄、曲柄摇杆机构、双摇杆机构存在的条件 ;并借助于计算机机构仿真的方法 ,研究了双曲柄混合输入五杆机构的连杆曲线随机构尺寸参数和运动参数变化的新规律。     

实现变传动比成组轨迹的混合驱动机构的综合

改变混合驱动五杆机构的尺寸参数和运动参数，可以得到不同的连杆曲线；因此可以采用混合驱动五杆机构实现具有不同传动比要求的、成组的连杆曲线。本文建立了实现成组轨迹的混合驱动机构的综合模型，实现了具有不同传动比要求的成组连杆曲线综合。     

影响双曲柄铰接五连杆机构连杆曲线的因素

介绍了铰接五连杆机构的连杆曲线的求解方法，分析了影响铰接五连杆机构连杆曲线的因素，绘出了几种特殊的铰接五连杆机构的连杆曲线，并简要介绍了铰接五连杆机构的应用前景。     

平面四杆曲柄摇杆机构连杆曲线形状分布规律的研究

本文以平面四杆曲柄摇杆机构的连杆参数Ｌ和α的分解研究为基础，描述了连杆曲线形状的类似性和渐变过程。确立了连杆曲线的分布域，进而揭示了连杆曲线分布的一些新规律。     

对称五杆机构连杆曲线的对称性研究

利用matlab建立仿真模型,对对称五杆机构连杆曲线具有的特殊性质进行研究,发现在一定条件下该机构的连杆曲线具有对称性,并对这一特性进行深入分析与证明,为对称五杆机构连杆曲线图谱的建立和机构优化综合提供理论依据。     

连杆曲线的全局结构分析

提出了对连杆曲线的一个实用分类方法，并给出了不同曲线分布区域的边界方程；完成了四杆机构连杆曲线全局结构分析；初步分析了一般连杆曲线及其全局结构的演化规律。     

对称五杆机构连杆曲线的特性研究

对称五杆机构作为一种具有特殊结构尺寸的五杆机构,在机械设计中有着广泛的应用,掌握其连杆曲线具有的特殊性质是对机构进行设计应用的前题。利用Matlab6.5语言建立仿真模型,对对称五杆机构连杆曲线具有的特殊性质进行研究,发现在一定条件下该机构的连杆曲线具有稳定性、相似性、对称性等特殊性质,并对这些特性进行深入分析,为对称五杆机构连杆曲线变化规律及曲线分类研究、特征电子图谱的建立和机构优化综合时初值确定提供理论依据。     

齿轮五杆机构轨迹曲线生成系统的研制

借助于计算机辅助设计的方法,研制了齿轮五杆机构的轨迹曲线生成系统。该系统可以研究齿轮五杆机构中各个参数对轨迹曲线的影响,并能以动画客观地显示出机构中各构件的速度、加速度等的变化情况,为齿轮五杆机构的轨迹综合提供了可参考的依据。     

Four-bar and geared five-bar linkage analysis programs for the apple computerQuatre barres et cinq barres avec engeranage: Programme d'analysis sur micro-ordinateur “apple”

The increasing availability and decreasing cost of the personal microcomputer to the student and practicing engineer has revolutionized the approach to mechanism design. Many quite sophisticated linkage design and analysis programs have been available for many years, such as LINCAGES[1], KINSYN[2], DRAM, ADAMS[3] and IMP[2]. These typically require a medium-to-large computer with expensive graphics terminals. MICRO-KINSYN has recently been adapted for a modified Apple computer, but it uses a coprocessor and additional memory which adds to its cost over the standard Apple computer. Other kinematics programs for personal computers are becoming available, such as Barker's[4] for the IBM PC. Kot and Bendickson[5] have adapted Erdman's ‘Linkages’ techniques to the Apple computer. The programs described here (called FOURBAR and FIVEBAR) were written to serve as analysis tools rather than for synthesis. They presume that the user has selected a potential four-bar (FB) or geared five-bar (GFB) linkage design by some means and wishes to analyze its behavior. The programs are designed to operate in a standard Apple IIe or 64K II + machine with no memory enhancements other than the standard language card. The programs also make extensive use of the computer's graphics capabilities to depict the linkage and its coupler curve in all positions calculated as well as to plot positions, velocities and accelerations of selected points on the linkage. Thus the user can quickly test his potential design for viability based on velocity and acceleration considerations. Design by successive analysis is thus expedited.The geared five-bar linkage (GFB) offers the designer greater flexibility in output path configuration than the four bar due to the fact that it has three additional design parameters: namely, gear ratio, phase angle and an additional link[6]. The coupler curves for this linkage are of higher order than those of the four bar, when the gear ratio is not unity.     

Optimization of parameters for specified path generation using an atlas of coupler curves of geared five-bar linkages

An atlas containing 732 coupler curves traced by the symmetric geared five-bar linkage has been drawn by the authors. Gear ratios of +1, −1, +2, −2, have been used. The data are presented either six or twelve curves to a page, arranged in axonometric projection to illustrate the envelope of a family of curves of that particular linkage geometry as the gearset phase angle isvaried. Dots on the curve represent uniform intervals of input crank angular displacement in order to provide coupler point velocity information. Other curves for parameters lying between those illustrated can be visually interpolated. Optimization techniques can be applied to modify the geometrics of a linkage parameters selected from the atlas as an approximate solution to the path motion desired. The origincurves are drawn on 11 × 17 sheets in four colors with a Benson-Varian xy plotter. Optimization algorithms are then used in conjunction with the atlas of linkage coupler curves to refine an initial selection of a desired motion path to achieve a particular motion with minimum deviation. The geared five-bar linkage is used as an example and a straight line generator is designed with less than 1% position error.     

带有差动轮系的混合驱动五杆机构及其运动分析和综合

文中引入了一种带有差动轮系的RRRPR混合驱动五杆机构.该机构把五杆机构与锥齿轮差动轮系结合起来,使得连架杆的输出转角和长度具有耦合特性,将实时可控电机(RTA)安装在机架上,以消除电机质量对机构动力学性能的影响,改善电机工况.介绍了该机构的运动学分析和综合方法,并反求出可控电机的运动规律.从机构综合示例来看,该机构能够明显减少可控电机的调整量.     

蜗杆斜齿轮传动重合度的研究

以汽车座椅角度调节驱动器为例介绍金属蜗杆与塑料斜齿轮传动副的应用。在参考文献的基础上推导出蜗杆斜齿轮传动重合度公式,分别绘制出压力角an、齿顶高系数han、变位系数x、蜗杆分度圆导程角γ、斜齿轮齿数z2对重合度的曲线图并分析各参数对重合度的影响。     

一类齿轮五杆轨迹同源机构的研究

借助于Roberts-Chebyshev定理,将曲柄摇杆轨迹同源机构的两曲柄分别用一双杆组代替,并要求双杆组满足一定的几何尺寸条件和运动条件,使变形后的机构为齿轮五杆机构,且满足机构的一个连架杆以及与其相连的连杆能够整周转动。通过对两机构间的几何关系分析和连杆平面上一参考点运动轨迹谐波成分分析以及机构运动仿真演示,证明了这两个机构为轨迹同源机构,并揭示了这种同源机构基本结构尺寸型间的内在联系。     

Load Sharing Behavior of Star Gearing Reducer for Geared Turbofan Engine

Load sharing behavior is very important for power-split gearing system, star gearing reducer as a new type and special transmission system can be used in many industry fields. However, there is few literature regarding the key multiple-split load sharing issue in main gearbox used in new type geared turbofan engine. Further mechanism analysis are made on load sharing behavior among star gears of star gearing reducer for geared turbofan engine. Comprehensive meshing error analysis are conducted on eccentricity error, gear thickness error, base pitch error, assembly error, and bearing error of star gearing reducer respectively. Floating meshing error resulting from meshing clearance variation caused by the simultaneous floating of sun gear and annular gear are taken into account. A refined mathematical model for load sharing coefficient calculation is established in consideration of different meshing stiffness and supporting stiffness for components. The regular curves of load sharing coefficient under the influence of interactions, single action and single variation of various component errors are obtained. The accurate sensitivity of load sharing coefficient toward different errors is mastered. The load sharing coefficient of star gearing reducer is 1.033 and the maximum meshing force in gear tooth is about 3010 N. This paper provides scientific theory evidences for optimal parameter design and proper tolerance distribution in advanced development and manufacturing process, so as to achieve optimal effects in economy and technology.