按复杂边界条件设计凸轮曲线

本文论证了凸轮从动件的位移与其加速度曲线之间的“面积矩”关系。为了调整以数值方式给出的加速度曲线,本文提出了“附加曲线”法。运用上述的关系和方法,能够解决下述问题,使凸轮从动件的位移、速度、加速度和跳跃度在区间始末两处能精确地符合给出的数据,而且,能够直接控制加速度曲线的形状和最大值。最后给出了胶印机递纸构件在一个区间内加度曲线的设计过程。     

凸轮机构综合与分析的接触条件法

以从动件与凸轮轮廓必须保持直接接触的约束条件建立位置方程,再通过位置方程对凸轮转角的求导,导出了轮廓极径的一、二阶导数与从动件类速度和类加速度之间的关系方程;利用上述方程,根据已知的凸轮轮廓,确定出从动件运动量的变化规律,并按照取定的从动件运动规律,导出了凸轮的轮廓方程和曲率半径等参量。     

滚子从动件盘形凸轮机构的运动分析

针对滚子从动件盘形凸轮机构，根据凸轮机构运动简图和凸轮实际廓线测量值，导出了确定从动件的位移、速度、加速度及其机构压力角的计算公式，并用实例验证了计算公式的正确性。     

凸轮机构的反求设计

介绍了胶印机离合压凸轮机构反求设计时剔除制造误差的数据分析方法.由凸轮实际廓线测得离散数据,根据凸轮设计理论推导出凸轮理论廓线值.应用数值计算方法,计算凸轮从动件的角位移及类加速度值.将类加速度与期望类加速度值进行比较,得出类加速度误差,进而求得角位移误差.剔除角位移误差后的数据更接近原始设计数据.     

内燃机配气凸轮的理想运动规律的设计与研究

介绍了内燃机配气凸轮从动件的运动曲线种类 ,研究了如何进行配气凸轮从动件运动曲线设计 ,提出了获得理想凸轮运动规律的方法     

平底摆动盘形凸轮机构运动误差分析计算

通过引入凸轮机构的压力角和凸轮法线长的概念,应用矢量分析的方法,给出了平底摆动从动件凸轮机构的理论凸轮轮廓的矢量方程和考虑凸轮法向误差的实际凸轮轮廓的矢量方程。研究了凸轮轮廓的法向误差与凸轮机构运动精度之间的关系,推导出了从动件摆角、角速度和角加速度误差的计算公式。分析确定了影响从动件摆角、角速度和角加速度误差的主要因素。指出了提高和改善凸轮机构的运动精度和性能的措施和途径,对于设计制造高精度凸轮机构具有重要的指导意义。     

The kinetothermal analysis and synthesis of cam systemsDie warmekinetische analyse und synthese von kurvengetrieben

The meaning of kinetothermal analysis and synthesis of mechanisms is defined. Using kinetothermal analysis and synthesis, an analytical technique is developed to describe and compensate for the kinetothermal errors in displacement, velocity and acceleration in cam-follower systems. The class of problems considered includes the case where either a cam, follower or framework is subjected to a different uniform temperature than the other two and the case where a cam, follower or frame expand differently in a uniform temperature change due to unequal coefficients of thermal expansion. An example application is presented.     

求盘形凸轮机构平底移动从动件加速度的同速点法

同速点法是机构运动分析图解法中一种非常重要的方法 ,利用它对某些平面机构 ,特别是平面高副机构进行速度分析及角速度分析是非常方便和直观的 ,但一般认为利用这种方法不便或不能求解加速度或角加速度问题。通过对凸轮机构从动件加速度的理论分析及假想机构的构造、假想机构的运动分析 ,介绍了应用同速点法求解凸轮机构从动件加速度的方法 ,使用这种方法可避免一般向量多边形法繁琐的求解过程 ,具有应用方便的特点     

Mechanical error analysis of disk cam mechanisms with a flat-faced follower

By employing the concept of equivalent linkage, this paper presents an analytical method for analyzing the mechanical errors of disk cam mechanisms with a flat-faced follower. The resulting error equations do not really involve the location of the curvature center of the cam profile, and locating the curvature center of the cam profile is not essential. The resulting errors are significantly affected by the pressure angle, and the smaller pressure angle will result in the smaller mechanical error. In the worst case, owing to the joined effects of various design parameters, the accuracy of the follower motion may degrade considerably. For the oscillating follower case, all acceleration error functions have a sudden change at every beginning and at every end of the motion even though the theoretical follower displacement is cycloidal motion.     

Contact Stress Distribution of a Pear Cam Profile with Roller Follower Mechanism

The problem of this paper is the high contact stress at the point of contact between the cam and the follower.A pear cam and roller follower mechanism were studied and analyzed for different position of the follower and different contact compression load.The objective of this paper is to study the effect of contact compression load on the contact stress distribution of the cam profile at the point of contact.Four different positions of the follower with the cam was considered(0°,90°,180°,and 270°).The theory of circular plate was applied to derive the analytic solution of the contact stress.The numerical simulation had been done using ANSYS Ver.19.2 package to determine the contact stress,while SolidWorks software was used to investigate follower displacement,velocity,and acceleration.Four distinct values of the compression contact load,such as 3.121 N,6.242 N,9.364 N,and 12.485 N,were used in the numerical simulation.In the experiment setup,a photo-elastic technique was carried out in the field of polarized light to exhibit the stress distribution on the cam specimen.The annealed PSM-4 backalate material was used in the experiment setup.The experimental value of contact stress was checked and verified analytically and numerically at the point of contact.The innovation in this paper the use of spring-damper system which reduce the value of contact stress at the point of contact.The contact stress was maximum 2.136 MPa when the follower located at 270° with the cam,while the contact stress was minimum 1.802 MPa when the follower located at 180°at compression load 12.485 N.     

高速凸轮机构的动态设计

建立了高速凸轮机构的动力学模型及其运动方程式．对具有摆线运动规律的从动件进行了动态响应的分析，并对凸轮机构进行动力学仿真，分析了从动件作用在凸轮上的作用力。为设计人员设计凸轮机构提供了一定的设计依据。     

Radius of Curvature and Entraining Velocity of Cam Follower Mechanisms

A general procedure for determining the equivalent radius of curvature and entraining velocity of various oscillating and reciprocating cam and follower mechanisms has been developed. This procedure requires as input the motion of the follower, i.e., the lift curve, the angular velocity of the cam and the basic geometry of the cam and follower mechanism. The radius of curvature of the cam at the point of contact was determined using the method of kinematic coefficients. A vector loop superimposed on the cam and follower was used to determine the entraining velocity of the mechanism at the point of contact.     

考虑间隙和柔性轴的圆柱分度凸轮机构动力学特性研究

对圆柱分度凸轮机构动力学特性进行了研究,在考虑间隙存在和柔性轴的前提下建立了系统的动力学方程,并应用有限差分法进行求解。结果表明从动件的最大角加速度提高了24．3％。凸轮轴的角速度高频振荡,波动幅值为3．2％,这为高速凸轮机构设计提供了依据。     

摆动滚子从动件盘形凸轮机构运动误差分析计算

研究了摆动滚子从动件凸轮机构的加工与从动件位移误差之间的关系。推导出了从动件位移误差计算公式，该公式可用于分析计算从动件位移误差。指出了合理选定凸轮机构的参数和加工精度。可减小从动件位移误差，提高摆动滚子从动件凸轮机构的运动精度。     

按任选的虚拟加速度曲线设计凸轮廓线

The design Procedure described in this paper consists of: 1, Selection of a virtual acceleration curve represented by a series of numerical values ( α mm)　with arbitrarily presc-ibed shape according to working requirements of the cam follower; 2, Selection of incremental cam angle according to the desired and attainable accuracy of　contour fabrication; 3, adjustment of the above virtual curve so that it will satisfy certain given requirements or　boundary conditions of the follower during its stroke. Various follower boundary conditions are　grouped into four classes. For each class an equation for adjustment is derived; 4, Calculation of the unknown scale factorαa mm/s=/mm(actual acceleration A in mm/s2 =μaα) and the required cam profile by substituting in a set of equations derived for each class of boundary conditions A historical review about this topic and an example for approving design formulas are placed at the beginning and ending of this paper.     

A CAD/CAM System for High Performance Precision Drum Cams

This paper describes a computer-aided design and manufacturing system for the design and production of complex profiles for high-performance drum cams within the specified tolerance. The system graphically generates the cam profile on the cylindrical drum after performing an analysis of the kinematic performance for the prescribed follower motion, using a B-spline representation of follower curves. Eight different types of follower motion for a translating follower are considered. The kinematic performance is based on the criteria of achieving the lowest levels of velocity and acceleration for each curve. The system is also able to simulate the motion of the designed cam graphically. The system also recommends the best cam profile on the basis of comparing the kinematic performance of all the B-spline representations of all the follower motions.     

Kinetothermoelastodynamic (KITED) synthesis of cam profiles

The Kinetothermoelastodynamic (KITED) model used is a single degree-of-freedom flexible cam-follower system in which the unconstrained thermal distortion of the cam is considered. The synthesis equation for the cam profile is derived for a prescribed follower acceleration in either analytical or numerical form. The technique is demonstrated by numerical examples.     

圆盘形凸轮机构及其优化设计

给出了圆盘凸轮机构的推杆位移、速度、加速度和压力角的计算式,引入了极位夹角及行程速度比系数的概念,进行了机构的结构、运动和力的分析,建立了优化设计模型,根据优化设计的结果,给出了简化的设计方法。     

多圆弧凸轮接触点位置的计算机辅助求解

提出了一种简单有效的多圆弧凸轮机构瞬时接触点位置的计算机辅助求解方法,它通过分析凸轮与从动件的瞬时接触公法线与圆弧区域界线之间的相对关系来判断任一瞬时凸轮与从动件的接触点的位置、接触点处的曲率半径和曲率中心的位置,据此,可对凸轮机构进行高副低代和运动分析。该方法对于直动、摆动、尖顶、滚子、平底从动件凸轮机构均适用。应用被建议的方法对含平底摆动从动件圆弧凸轮的多功能家用缝纫机送料机构进行了运动分析及动态仿真,验证了该方法的有效性。     

弧面分度凸轮机构动力学建模与Simulink仿真技术的研究

对弧面分度凸轮机构动力学特性进行了研究，考虑间隙存在、柔性轴和电机特性下，建立了系统动力学方程，应用Matlab／Simulink求解和动态仿真。结果显示间隙对凸轮和工作盘的响应有影响，从动件最大角加速度提高28％，电机输出轴角速度高频振荡。