999 resultados para Cable-Driven Parallel Manipulator


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[ES]El proyecto consiste en el desarrollo mecánico de un manipulador paralelo basado en un mecanismo de cadena cerrada y 5 pares de rotación moviéndose en un mismo plano, de modo que cubra un espacio de manipulación previamente definido. Para ello se realizan los diseños en programas de CAD y se realizan los planos de diseño y montaje con el objetivo de posteriormente llevar el diseño a la realidad.

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ES]El Trabajo Fin de Grado que se presenta a continuación tiene como objetivo principal el diseño de una unión flexible que formará parte de las patas de un robot de cinemática paralela. Por la propia arquitectura de estos mecanismos, y para dotar a la plataforma de movimientos precisos, esta unión, ubicada en la parte superior de las patas, debe deformarse al ser sometida a esfuerzos de flexión y torsión. Se realiza un adecuado diseño que maximice las deformaciones de dicha unión a la par que se garantiza una adecuada duración de la misma para la aplicación requerida. A su vez, se comprueba que las tensiones a las que se verá sometida no superan el límite de fluencia del material elegido. Todo ello se realiza de forma computacional mediante el método de los elementos finitos.

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[ES]Se trata de diseñar, programar, fabricar y montar un manipulador paralelo de 5 pares de revolución, que sirva para el atrape y posterior desplazamiento de objetos pequeños en un área de trabajo determinado. Este proyecto se centra exclusivamente en el análisis cinemático, resistente y posterior optimización del diseño del mecanismo de barras del manipulador.

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采用串联约束 /并联驱动的原理 ,通过加入约束机构 ,设计一种新型柔索驱动并联机器人。然而由于约束机构的引入 ,机器人的动力学分析变得更为复杂。在对机器人进行运动学分析的基础上 ,利用牛顿 欧拉法建立机器人动力学方程。仿真结果证明了该方法的有效性

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柔索驱动并联机器人采用柔索代替连杆作为机器人的驱动元件 ,它结合了并联结构和柔索驱动的优点 .文章提出了一种新型带有约束机构的并联柔索驱动机器人 ,采用四根柔索驱动 .由于约束机构的引入 ,机器人可实现在空间的三维转动 .介绍柔索驱动并联机器人的机构构型 ,给出了位姿逆解 ,建立了静力平衡方程和运动学方程 ,讨论了柔索拉力的确定方法 .研究结果证明在加入了约束机构后 ,柔索机器人可以实现更多的运动形式 ,这就为更广泛的应用柔索驱动成为可能

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针对一种新型的4-DOF并联机构的结构特点,采用基于逆解计算的网格法对其工作空间求解的算法进行了详细的分析,并利用Matlab编制了相应的程序,以Matlab图的形式描绘了几种情况下的工作空间区域,并对此进行了分析。

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研制了一种有重力约束的三索控制的柔索吊床机构来模拟船体海面上的运动。为了解三柔索吊床机构的运动特性 ,对其进行了运动学建模与仿真。仿真结果表明 ,台面倾角在 0°~ 30 0°变化时 ,台面不碰撞立柱 ,且柔索伸缩长度与台面倾斜角度接近于线性变化。本文所做的工作对吊床平台避免撞击立柱、缩小吊床立柱布置空间、提高空间利用率 ,以及为吊床的运动控制提供了理论依据

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提出一种用铅垂导轨上 4个滑块作为原动件的新型四自由度并联机器人 .该并联机器人的动平台能够实现两个方向的移动以及绕两个方向轴线的转动 .研究了该并联机器人的运动学建模方法 ,给出了运动学正、逆解 ,用 Grassmann几何法分析了该并联机器人在其工作空间内不会出现奇异形位 .基于该四自由度并联机器人可以非常方便地开发具有大工作空间的五轴联动数控机床

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出一种新型的三杆三自由度并联机器人机构,并推导了其运动学正反计算式,给出运动空间和根据作业空间设计结构参数的计算式。

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基于一般STEWART机构研制的并联机器人机床是新一代智能化金属切削加工机床.然而,机床的运动学位置正、逆解呈强非线性,求解困难.出于机床精度的需要,本研究的模型样机在结构上采用了滚珠丝杠传动,因此又带来了关节运动耦合,导致机床运动学位置正、逆解求解更加复杂.利用运动学等效的原则,引入整机等效串联机构及分支等效串联机构,以等效广义坐标为中间变量建立机床运动学正、逆解求解迭代算法.仿真与控制实验表明,该算法具有收索速度快便于实际应用等特点。

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根据运动学等效的原则,在并联机器人中引入等效串联机器人及分支等效串联机器人,以等效广义坐标为中间变量建立并联机器人运动学正道解求解算法。该算法能有效处理结构带来的运动耦合,并且规划的软件具有自动生成迭代初始点、避免多解性以及便于实际应用等特点,从而为并联机器人的结构设计与创新提供了理论支持。

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提出了一种3分支5自由度的并联激光焊接机器人,通过3个分支共同作用,使整机具备了5个自由度的空间加工能力.针对激光焊接,通过分析该机器人的结构特性,建立了其正反解运动学模型,通过解析法求解该模型并进行了计算仿真.最后,对机器人进行激光拼焊实验,仿真数据和实验结果表明,本文研究的并联机器人机构适用于实际的高速、高精度激光焊接。

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The parallelization of existing/industrial electromagnetic software using the bulk synchronous parallel (BSP) computation model is presented. The software employs the finite element method with a preconditioned conjugate gradient-type solution for the resulting linear systems of equations. A geometric mesh-partitioning approach is applied within the BSP framework for the assembly and solution phases of the finite element computation. This is combined with a nongeometric, data-driven parallel quadrature procedure for the evaluation of right-hand-side terms in applications involving coil fields. A similar parallel decomposition is applied to the parallel calculation of electron beam trajectories required for the design of tube devices. The BSP parallelization approach adopted is fully portable, conceptually simple, and cost-effective, and it can be applied to a wide range of finite element applications not necessarily related to electromagnetics.

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Workspace analysis and optimization are important in a manipulator design. As the complete workspace of a 6-DOF manipulator is embedded into a 6-imensional space, it is difficult to quantify and qualify it. Most literatures only considered the 3-D sub workspaces of the complete 6-D workspace. In this paper, a finite-partition approach of the Special Euclidean group SE(3) is proposed based on the topology properties of SE(3), which is the product of Special Orthogonal group SO(3) and R^3. It is known that the SO(3) is homeomorphic to a solid ball D^3 with antipodal points identified while the geometry of R^3 can be regarded as a cuboid. The complete 6-D workspace SE(3) is at the first time parametrically and proportionally partitioned into a number of elements with uniform convergence based on its geometry. As a result, a basis volume element of SE(3) is formed by the product of a basis volume element of R^3 and a basis volume element of SO(3), which is the product of a basis volume element of D^3 and its associated integration measure. By this way, the integration of the complete 6-D workspace volume becomes the simple summation of the basis volume elements of SE(3). Two new global performance indices, i.e., workspace volume ratio Wr and global condition index GCI, are defined over the complete 6-D workspace. A newly proposed 3 RPPS parallel manipulator is optimized based on this finite-partition approach. As a result, the optimal dimensions for maximal workspace are obtained, and the optimal performance points in the workspace are identified.

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A time-resolved Langmuir probe technique is used to measure the dependence of the electron density, electron temperature, plasma potential and electron energy distribution function (EEDF) on the phase of the driving voltage in a RF driven parallel plate discharge. The measurements were made in a low-frequency (100-500 kHz), symmetrically driven, radio frequency discharge operating in H-2, D-2 and Ar at gas pressures of a few hundred millitorr. The EEDFs could not be represented by a single Maxwellian distribution and resembled the time averaged EEDFs reported in 13.56 MHz discharges. The measured parameters showed structure in their spatial and temporal dependence, generally consistent with a simple oscillating sheath model. Electron temperatures of less than 0.1 eV were measured during the phase of the RF cycle when both electrodes are negative with respect to the plasma.