基于AutoCAD凸轮轮廓曲线设计

本文以AutoCAD2008为平台,介绍图解法、解析法绘制尖顶式对心直动盘形凸轮轮廓曲线设计中方法和步骤、数学模型的建立以及以VBA为开发工具,参数化设计尖顶式对心直动盘形凸轮轮廓CAD运行框图及系统的实现,。采用AutoCAD建立凸轮轮廓曲线设计,原理简单,在已知设计参数的条件下,能迅速确定凸轮轮廓各点的坐标值,且能随时修改,可以方便快捷地设计出精确地凸轮轮廓,提高凸轮的设计精度和缩短设计周期。     

直、摆组合凸轮机构动态仿真技术研究

直、摆组合凸轮机构是一种新型的机构类型，它所能实现的凸轮曲线非常丰富多彩，对其进行运动仿真，对于验证设计的正确性以及指导实际生产都有重要的现实意义。该文首先简介了直、摆组合凸轮机构的设计方法，进而介绍了该机构的动态仿真软件和动态仿真技术，并对动态仿真中的几点关键技术作了进一步的阐述。     

基于VB的凸轮机构的参数化设计及其动画仿真

本文以VB为主体开发语言,实现了参数化设计凸轮和凸轮轮廓设计过程的动画仿真,既提高了凸轮设计效率,又益于计算机辅助教学。     

基于VB的凸轮机构的参数化设计及其动画仿真

本文以VB为主体开发语言,实现了参数化设计凸轮和凸轮轮廓设计过程的动画仿真,既提高了凸轮设计效率,又益于计算机辅助教学.     

基于ObjectARX的凸轮机构CAD系统的研究

一、前言 凸轮机构是一种常见的、能使从动件按照给定的运动规律运动的高副传动机构,然而,由于凸轮机构设计复杂、几何形状计算工作繁琐、凸轮轮廓的精度对输出响应影响较大以及凸轮的加工困难等原因,使得其应用范围及应用水平受到限制.     

基于CATIA的平面盘形凸轮从动件运动规律反求研究

研究了从CATIA数字模型中获取凸轮轮廓曲线上离散点坐标的方法,并以这些离散点及凸轮机构基本尺寸为依据,提出了反求机构从动件的运动规律的方法。利用CATIA提供的COM功能，结合其自带的V5Automation API函数开发了反求从动件的运动规律算法及程序，并对反求所得结果与理论结果进行了误差分析,研究表明本文提出方法是准确的和适用的。     

基于UG二次开发的下摆式递纸机构的系列化设计

对共轭凸轮下摆式递纸机构的工作原理进行了分析,并对其进行了参数化设计;为了方便设计开发人员,加快产品的设计开发周期,根据参数化设计的基本原理,对共轭凸轮下摆式递纸机构进行了基于UG的系列化设计。     

基于UG/Motion的凸轮连续变焦机构设计

为了使所观测目标在像面中的大小在视场变换的过程中连续变化而不丢失,设计了一种圆柱凸轮连续变焦机构,变焦范围为10mm～300mm。利用UG/Motion软件仿真模块对变焦机构进行了运动分析,结果表明变焦机构的变焦精度为0.009mm,变焦运动仿真曲线与理论设计曲线高度重合,变焦平稳可靠,满足光学系统设计指标要求。连续变焦机构设计方法不但缩短了开发周期,节约了研制成本,为进行变焦机构的设计提供了参考。     

弧面分度凸轮CAD技术研究

在分析弧面分度凸轮工作原理的基础之上,利用VC++进行了弧面分度凸轮轮廓面点的设计计算,并通过Imageware软件的点云处理功能及UG软件的实体生成功能,成功的生成了弧面分度凸轮机构的CAD模型,为后续虚拟设计及加工打下了良好的基础。     

凸轮的计算机辅助设计

<正> 凸轮机构是一种常用机构,广泛地应用于自动化机械、仪表和各种操纵控制装置中,其最大优点就在于:只要凸轮的轮廓曲线设计得适当,就可以使从动件获得任何预期的运动规律。所以,凸轮机构设计的     

Computerized tolerance analysis of disk cam mechanisms with a roller follower

The tolerance analysis is one of the key elements of design and manufacturing of cam mechanisms. This paper presents a computerized method for analyzing the tolerances in disk cam mechanisms with a roller follower. By employing the concept of simulated higher-pair contact analysis, the kinematic deviation of the follower motion arising from the tolerance amount of each design parameter can be determined numerically. The offset translating roller follower and the oscillating roller follower cases are given to illustrate the proposed method. The tolerance analysis results show that, owing to the combined effects of various design parameters, the position accuracy of the follower motion may degrade considerably. But, the tolerance amounts of the design parameters may also have a compensating effect to enhance the relative accuracy of the follower motion between its high and low dwell positions. Hence, it is possible to find the optimal tolerance combination for balancing the kinematic accuracy and the tolerance amounts of disk cam mechanisms with a roller follower.     

基于反求技术的摆动从动件空间凸轮CAD

由于测绘点的实际接触点在理论上存在差异,摆动从动件空间凸轮机构的反求问题目前仍未获取很好解决,本文在空间凸轮反求ＣＡＤ中,担子 利用廓面测绘数据根据共轭面面原理反求出从动件运动规律,再利用该运动规律和有关结构参数重新解析设计出廓面的新方法。文中对反求方法和测绘数据进行了分析;提出了理论廓面、实际廓面的相关性质;在此基础上,利用共轭曲面原理导出了从动件运动反求的非线性规划数学模型,给出了算法。本文的     

风洞CTS试验六自由度机构控制方法研究

针对一种风洞CTS试验六自由度运动机构,在分析机构的结构特点和运动关系的基础上,对其控制方法进行研究;六自由度运动机构由3个角位移和3个线位移组成,首先建立机构的运动模型,分析了各轴的传动关系和相互运动关系,针对角度传动的非线性关系特点,采用了基于虚拟轴的跟随控制方法,实现了实际角度的匀速控制;根据六自由度运动关系分析了位置和速度关系,采用速度补偿的方法,实现了六自由度的联动控制;采用高性能的运动控制器和驱动器构成了角度双闭环控制系统,实现了该机构要求的所有运动功能;最后通过实验验证,测量了角度控制精度,结果表明角度控制精度都达到或超过了设计指标,能够满足风洞CTS试验要求。     

Object-oriented cam design through the internet

We have developed a Web-based interactive cam design package under the programming paradigm of the language environment. This package was initially developed as a teaching and learning tool for educational use in an undergraduate Computer-Aided Mechanism Design course. Because the system is Web-based and implemented through a client/server model with the user interface through the Web browser, it is easy to use and maintain. The system can also be used to solve practical engineering cam design problems with flat or roller followers and with translating or oscillating motion types. The system can be used to generate the cam profile, transmission angle, position, velocity, and acceleration of the follower. Once a cam/follower system is designed, animation of the cam/follower system can be performed. At the end of the design, the CNC code for manufacturing the designed cam can also be produced through our Web-based cam design system. The package consists of a number of modules including various Web pages, common gateway interface (CGI) programs, a program called cam.ch, and the CCam class which performs the necessary computation for cam design. Two different versions of the cam design package have been designed and implemented. One runs the cam design program on the client machine as a applet, and the other runs the cam design program on the Web server through CGI. In this paper, details of design and implementation of Web-based cam design package will be described. Two application examples with different motion types for the follower will be used to illustrate features of the applet-based and CGI-based implementation schemes. The ideas of the Web-based software design presented in this paper can be applied to other application areas.     

基于Pro/E的止痛泵凸轮结构设计

止痛泵在临床治疗中得到越来越多的应用。本文首先在Pro/E环境下,根据凸轮从动件的运动规律,建立止痛泵结构中凸轮的廓线,从而完成凸轮的三维实体设计。利用Pro/E强大的造型功能,获得了合理的设计模型,同时还得到了凸轮的精确外形,为后续的分析及加工提供了便利条件。若需设计从动件运动规律不同的凸轮,只需更改运动规律,生成不同的运动规律简图,就可以改变凸轮的设计模型,这种方法操作简单,对各种结构的设计具有良好的借鉴作用。     

基于PRO/E的凸轮机构运动仿真及分析

机械产品的运动分析和仿真在机械产品的设计中是不可缺少的重要环节。文章通过凸轮机构的运动仿真设计过程介绍了Pro/E中的仿真模块以及运动分析。     

基于加权支持向量机的凸轮升程误差拟合方法

针对凸轮磨削加工过程中存在局部升程误差严重超差的问题,提出了加权支持向量机的凸轮升程误差补偿方法。首先根据圆率的符号判断凸轮升程误差值是否连续,然后建立了不连续点与相邻点之间夹角与加权值的关系。通过加权支持向量机对凸轮升程误差值进行拟合。然后将原始凸轮升程值减去经拟合后的凸轮升程误差值,获得新的凸轮升程值。再根据圆率自动调整加权值的系数,使凸轮升程值光滑点数最大,即获得最优的凸轮升程值。对上述算法进行仿真和编程,经YTM8336-16数控凸轮轴磨床进行磨削验证。实验表明,凸轮升程误差由原来的±0.059 mm降至±0.011 mm,表面粗糙度由Ra0.32μm降至Ra0.25μm,获得良好的效果。     

A sensor-aided self coaching model for uncocking improvement in golf swing

This paper describes an autonomous kinematic analysis platform for wrist angle measurement that is capable of evaluating a user’s uncocking motion in his or her golf swing and providing instructional multimodal feedback to improve his or her skills. This uncocking motion, which is a characteristic movement of the wrist during the golf swing, is an important factor in achieving accurate ball hitting and long driving distances, but is difficult to measure. In order to efficiently compute the wrist angle for uncocking evaluation, we present a sensor-based intelligent Inertial Measurement Unit (IMU) agent that collects three-dimensional orientation data during the golf swing from two IMU sensors placed on the forearm and on the golf club. It accurately analyzes changes in wrist angle to detect uncocking throughout the sequence of golf swing motions. In this paper, we first introduce the design considerations based on the concept of the uncocking motion and explain the system architecture with the sensors used for quantitative measurement and qualitative feedback generation. Then, we illustrate the detailed algorithms for wrist angle computation, golf swing motion segmentation based on key pose detection, and uncocking evaluation. A multimodal feedback-based user interface for our system is also presented. Experimental results show that the proposed system has the ability to accurately calculate the wrist angle in real time and also that it can be applied to a practical self-coaching system to improve the uncocking motion.