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以计算机数控(CNC)系统代替普通滚齿机中的机械传动链,建立了一种新型的滚齿机机构,依据此机构,建立了统一的齿轮加工数学模型;推证了机构的运动转换矩阵和相关的运动方程,并在计算机上实现了齿轮模拟加工;通过调整滚切运动,可以实现任意设计的齿形及齿向;通过对齿轮加工误差计算机数值仿真,得到了一系列有价值的结论。 相似文献
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用广义机构综合法进行平面四杆机构的综合 总被引:1,自引:0,他引:1
本文讨论了用广义机构综合法进行平面四连杆机构运动综合的一种新方法。作者应用该法建立了广义四杆机构统一形式的运动综合方程;并将平面机构综合的三类基本问题转换为广义机构综合问题;实现了平面四连杆机构运动综合方法的统一。为该法在计算机上的实现奠定了坚实基础。文中还给出了用面向对象的C++程序设计语言实现的该法的实例结果。结果证明了,该法原理正确、概念明确;并具有使用方便、求解精确等诸方面的优点。 相似文献
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实现变传动比成组轨迹的混合驱动机构的综合 总被引:1,自引:0,他引:1
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。 相似文献
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二自由度基本机构特征状态方程及其应用 总被引:3,自引:0,他引:3
提出了二自由度基本机构的特征状态分析方法,并依此建立了二自由度基本机构的数学知识模型。首先定义并归纳了运动功能特征模式,继而针对具体二自由度基本机构输入输出连续运动速度一般方程,提取输入输出运动的特征矢量,并在二元函数级数展开的基础上提取出函数的功能特征值,从而把二自由度基本机构的运动传递单元转化为运动特征变换单元,由此使机构的运动功能分析脱离机构单元本身具体尺度的影响;建立了二自由度基本机构的特征状态方程,进一步讨论了特征矢量、特征状态方程的性质及其运算规则,得到了运动传递特征和性质;研究了数学模型到基础数据的知识转换过程,建立了二自由度基本机构基础知识数据库,为机械系统方案设计提供选型依据。通过实例说明了造型过程及其具体方法。 相似文献
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一种新型脉动式无级变速器机构运动分析与运动仿真研究 总被引:2,自引:0,他引:2
介绍一种新型脉动式无级变速器的机构,在VB上建立了仿真运动模型,实现了机构的运动仿真,获得了运动特性曲线。为该类机构的动力分析和优化提供了理论依据。 相似文献
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The mammary gland has been an area of great interest to developmental biologists for many years because its formation involves many fundamental processes that are central to the development of other organs. Although mammary development has been well described structurally, the molecules and signaling mechanisms that are involved are still largely undefined. For the last several years, intensive effort has been made to understand the molecular mechanisms involved in mammary development. With the recent advances in transgenic and knockout technologies, the ability to delete and/or alter the expression of certain genes in the mouse genome has allowed us to begin to elucidate the mechanisms underlying mammary gland development. In this review, we discuss several mouse models that have provided insight into the molecules and signaling mechanisms that govern ductal development and lobuoloalveolar differentiation in the mammary gland. 相似文献
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In this paper a family of simple mechanisms having kinematic pairs of second class has been presented. For kinematic pairs of the second class (cam mechanisms) the radius and the coordinates of curvature have been described. The matrix method for calculation of the motion for cam mechanism with one kinematic pair of second class has been presented. An example application is also presented. 相似文献
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In the present paper a systematic finite element method for kineto-elastodynamic analysis of high speed mechanisms has been presented. Effects of number of divisions have been investigated and it is found that a certain minimum number of divisions of links is necessary to yield accurate results. A new approach for eliminating the singularity in the stiffness matrices of mechanisms has been developed and it has been shown in this paper that this new approach yields improved results with negligible additional effort. Finite element expressions for the coriolis, tangential and normal components of elastic accelerations have been derived for a moving link and a new geometric stiffness matrix has been developed to include the effects of the rigid body pinforces and the distributed axial rigid body inertia forces on the transverse vibrations of the links. The method has been further extended to take into account the nonlinear elastic axial forces. Several examples have been solved. 相似文献
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典型并联机构的演化关系及其分类研究 总被引:2,自引:0,他引:2
对文献中出现的各种典型、有代表性的并联机构的特点及它们之间的内在联系进行研究,并建立其相互之间的演化关系;提出一种新的并联机构分类方法,该分类方法反映了机构的本质特征以及对其进行研究的复杂程度。 相似文献
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实用化振动切削技术——总论 总被引:4,自引:0,他引:4
振动切削技术历经半个世纪的发展,逐步揭示了振动切削的机理,形成了振动切削理论体系。同时,在大量工艺试验研究的基础上,得到了大量的工艺效果并研制出了各种振动切削装备,逐步使振动切削技术走向实用化。 相似文献
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V. N. Pashchenko I. V. Sharapov G. V. Rashoyan A. I. Bykov 《Journal of Machinery Manufacture and Reliability》2017,46(3):225-231
Synthesis problems of handling mechanisms of simultaneous relative manipulation have been considered. The direct positional problem for the parallel structure mechanism of simultaneous relative manipulation has been solved. The operating space of the mechanism has been defined. 相似文献
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将资源定义为参与者,将合作任务定义为协作对象,则企业的生产过程可表示为反映制造资源合作关系的协作网络图.通过对其连接机制和演化机制的分析发现,该协作网络并非由基于BA模型的择优选择机制衍化而来,而是与其出现时间关系密切,因此,首先提出基于节点年龄的制造资源协作网络演化模型,并在此基础上对其进行模拟验证,结果显示该演化机制下同样可以反映出该网络的无标度特性.在进一步的分析中发现,采用项目度统计代替常规的顶点度统计来作为节点重要性衡量指标更为合理,并进行了论证.在验证了该统计模式并不改变模型无标度性的基础上,用两种统计法分别对模拟得到及采集得到的某机床企业实际生产数据进行处理及对比,最终很好地验证了相关设想. 相似文献