共查询到20条相似文献,搜索用时 15 毫秒
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R. H. Bao L. C. Zhang H. F. Li 《The International Journal of Advanced Manufacturing Technology》2013,66(1-4):445-454
This paper provides an analytical solution to describe the trajectories of fixed cutting edges in machining spherical surfaces when the relative motion between the cutting edges and the workpiece surface involves three independent rotations. The concepts of surface coverage ratio and trajectory uniformity were introduced to measure the efficiency of machining the curved surfaces. The effects of the maximum half-swing angle, rotational speeds and rotational direction of the tool and workpiece on the uniformity of the trajectory pattern were analysed in detail. It was found that with the aid of the analytical solution, an optimal machining condition can be obtained, which enables a uniform distribution of the cutting edge trajectories and a good surface coverage in a short period of machining time. 相似文献
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简介虚拟函数信号发生器的设计意义及应用特征,给出了基于LabVIEW的虚拟信号发生器的系统构成和程序设计流程图,着重讲述功能模块的设计步骤,提供了虚拟发生器的面板和程序代码框图。本仪器系统操作简便,设计灵活,具有很强的适应性。 相似文献
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V. A. Popov 《Russian Engineering Research》2010,30(7):662-667
The geometric stability of spherical transmissions is studied by geometric monitoring. On that basis, the contact conditions
of the active surfaces of worm turns and gear teeth in the transmissions may be determined before running-in, after running-in,
and at any stage of wear. Geometric monitoring is preferable to theoretical investigation of the contact conditions with known
theoretical surfaces of the transmission. 相似文献
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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. 相似文献
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This paper presents the relationships between the axodes and the geometric configuration of the spherical 4R mechanism. The order of the axodes of the spherical 4R mechanism is determined to be 16. The algebraic equations for the axodes of this mechanism are presented in terms of mechanism geometry. It is also shown that the order of the axodes of the simpler forms of the 4R spherical mechanism is lower than 16. 相似文献
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盲插技术在雷达设计中的应用越来越广泛。在安装板的设计过程中,轴向和径向配合尺寸是盲插连接器可靠连接的关键。某安装板上固定有两型盲插连接器,连接器安装密度大,数量多,因而安装板受力大,易变形。文中根据安装板的结构形式特点,在分析影响插拔可靠性因素的基础上,介绍了精度控制方法;通过建立安装板的有限元模型,对安装板进行了静载荷分析,其仿真结果与实物试验结果基本一致;针对安装板刚度差、变形大的问题,运用有限元法进行进一步优化,按分析结果选取最优的解决方案,满足了工程应用要求。这为相似构件提供了一个有效的值得借鉴的设计与优化方法。 相似文献
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J. Jesús Cervantes-Snchez Luis Gracia Jos M. Rico-Martínez Hugo I. Medellín-Castillo Emilio J. Gonzlez-Galvn 《Mechanism and Machine Theory》2009,44(11):2020-2037
This paper presents two new efficient computational methods for the exact kinematic synthesis of a spherical 4R function generator, involving five and six precision points. Several illustrative examples showing the applicability of the proposed approach are discussed and presented in detail. 相似文献
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空间曲线切口式柔性铰的设计 总被引:2,自引:1,他引:1
为了满足精密仪器连接部件的柔度和强度需求,以切口曲线为二次曲面和圆柱面的相贯线的柔性铰为例,研究了一类空间曲线切口式柔性铰的设计方法。推导了此类柔性铰转动柔度的一般设计计算公式,分析了设计参数对柔度特性的影响,在此基础上提出了此类柔性铰的设计方法。依据提出的方法设计了空间曲线切口式柔性铰,并利用有限元分析方法对设计实例进行了柔度和强度校核,同时建立了模态实验系统识别其柔度。结果表明,两种柔度校核结果与设计计算公式结果吻合较好,最大误差不超过5%,验证了设计方法的有效性,为此类柔性铰应用于精密仪器的工程设计提供了参考。此外,文中给出的有限元建模分析方法以及试验测试方法也可用于相同类型的精密构件的力学特性研究与分析。 相似文献
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3-P-2SS球平台机器人的运动传递性分析 总被引:4,自引:4,他引:0
研究了一种新型的3自由度3-P-2SS球平台机器人的运动传递性及其在工作空间的分布规律.该机器人在坐标原点具有最佳的运动传递性能,介绍其正交的结构布局特点,基于其位置反解推导运动学传递方程,定义其沿x、y和z方向的运动传递能力评价指标,给出这些评价指标在工作空间内的分布情况,这对该种球平台机器人的合理任务规划很有帮助. 相似文献
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针对力传感器标定系统难以精确加载微牛级微力的现状,设计了一种二级杠杆式微力发生机构。首先,在比较了常用柔性铰链精度性能的基础上,介绍了微力发生机构的工作原理。然后,在考虑杆件变形和柔性铰链中心偏转的基础上,分析了各级杠杆和各柔性铰链的受力和能量传递情况,推导了二级杠杆式微力发生机构力缩小倍数的理论计算方法,并以实现某一力缩小倍数为设计目标,据此提出了微力发生机构的优化设计方法。接着,进行有限元仿真分析,得到了不同输入力下的力值响应特性。最后搭建了微力发生机构的性能实验测试平台。结果表明,有限元分析、实验结果与理论力值间的最大误差分别为5.501%和7.391%,实验非线性误差为2.89%,可实现0~500μN的微力加载。认为力缩小倍数满足设计要求,验证了采用该优化设计方法准确设计二级杠杆式力柔顺机构、提高微力加载精度的有效性。 相似文献
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Stepless mechanical transmissions with vibrational motion of the internal elements are considered. In particular, attention focuses on their regulation. Basic principles are outlined for automatic control of a transmission with an internal force function depending on the vibrational amplitude of the internal elements. 相似文献
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Georg Nawratil 《Mechanism and Machine Theory》2011,46(5):725-742
We use the output angle of a spherical four-bar linkage C as the input angle of a second four-bar linkage D where the two frame links are assumed in aligned position as well as the follower of C and the input link of D. We determine all cases where the relation between the input angle of the input link of C and the output angle of the follower of D is reducible and where additionally at least one of these components produces a transmission which equals that of a single spherical coupler. The problem under consideration is of importance for the classification of flexible 3 × 3 complexes and for the determination of all flexible octahedra in the projective extension of the Euclidean 3-space. 相似文献
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介绍了两种函数方程曲线加工方法。一种是直接在加工中心系统上,利用函数运算功能边计算边加工。另一种是在CAD中根据所给的函数方程画出图形,在CAM中生成刀具轨迹程序进行加工。 相似文献