共查询到20条相似文献,搜索用时 109 毫秒
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利用矩阵分析理论建立了曲柄滑块机构精度分析的一般模型,利用状态函数建立了曲柄滑块机构运动精度的概率分析模型,以对心曲柄滑块机构为具体对象,建立了曲柄滑块机构运动输出精度模型及其概率分析计算模型。算例分析表明:在给定的设计精度下,对心曲柄滑块机构在不同的运动状态有着不同的运动误差和不同的运动可靠度。模型可以定量地给出曲柄滑块机构在不同运动状态下的失效概率,对曲柄滑块机构的设计与制造具有应用价值。 相似文献
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建立了通用曲柄滑块机构的运动学计算模型,在Excel环境下对模型进行了可视化、运动分析和机构运动仿真,实现了对曲柄滑块机构位移、速度和加速度变化的动态模拟,为曲柄滑块机构的运动和动力特性分析和优化提供了一种简捷而实用的方法. 相似文献
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应用Pro/E软件建立了内燃机曲柄滑块机构的虚拟样机模型,对曲柄滑块机构进行了运动仿真分析,得到了滑块的位移、速度、加速度变化规律,并获得了运动仿真曲线图,为曲柄滑块机构的设计改进提供了重要依据,提高了设计效率,缩短了开发周期。 相似文献
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双工作行程机构是指在原动件的一个运动周期内,执行构件具有两个工作行程和两个回退行程的机构。椭圆曲柄是能够生成椭圆曲线的行星机构,用椭圆曲柄替代曲柄滑块机构的驱动曲柄,相当于一个具有变化的长度和速度、沿着椭圆曲线运动的曲柄,从而改变了滑块的运动特性。适当选择机构参数可使椭圆曲柄滑块机构具有双工作行程运动特性。文中用一个特殊类型的椭圆曲柄滑块机构作为双工作行程机构,给出了机构分析与综合方法,分析了机构参数对各个行程的影响,给出了各个参数的选择范围,为双工作行程机构设计提供了理论依据。 相似文献
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在各类机械传动结构中,曲柄滑块有着广泛的应用,根据曲柄滑块机构设计的原理,提出在Pro/E中实现曲柄滑块设计及实体造型的方法,并利用Pro/E的运动分析模块(Mechanism)对曲柄滑块进行运动分析和仿真,提供对曲柄滑块的优化设计。 相似文献
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椭圆曲柄是能够生成椭圆曲线的行星机构,用椭圆曲柄作为曲柄滑块机构的驱动曲柄,相当于一个具有变化的长度和速度沿着椭圆曲线运动的曲柄,从而改变了滑块的运动特性。文中研究了对心椭圆曲柄滑块机构的运动特性,给出了机构的曲柄存在条件、最小传动角、滑块极限位置、行程速度变化系数等性能参数的计算方法。提出了按位移特性对椭圆曲柄滑块机构进行类型划分的分型方法,给出了各类型机构的存在条件。 相似文献
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Engin Tan?k 《Mechanism and Machine Theory》2011,46(11):1623-1632
The transmission angle is an important parameter for the quality of motion transmission in a mechanism. However, in the literature there is no study available on compliant mechanisms regarding their transmission characteristics. In this paper, the transmission angle of a compliant slider-crank mechanism is introduced. Similarity conditions for the transmission angle of the compliant slider-crank and its rigid body counterpart are devised via two theorems. A real model is manufactured and one of these theorems is verified experimentally. Finally, the effect of eccentric slider on motion transmission quality is discussed. It is believed that newly proposed theorems will find use in the design of compliant slider-crank mechanisms. 相似文献
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Using the spherical coordinate system in conjunction with the principle of algebraic correspondence between the displacement equations of the plane, spherical and spatial four-bar mechanisms and the plane and spatial slider-crank mechanisms, an efficacious procedure has been developed to carry out kinematic analysis for the coupler and output link of the mechanisms. The iteration-free nature of the procedure precludes any non-convergence problem and the inherent complexity of the 3-dimensional analysis is mitigated substantially. 相似文献
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Based on the algebraic correspondence between the displacement equations of the plane, spherical and skew four-bar linkages and the plane and skew slider-crank mechanisms, a highly compact, computationally efficient procedure has been developed for a microcomputer kinetmatic analysis of these linkages. 相似文献
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Most complex planar linkages with lower pairs are actually made up of several simple mechanism components in series. When this is the case, it is possible to analyze the complex linkages by sequentially analyzing each of the simpler mechanism components. This procedure was described by Suh and Radcliffe[1], who have developed positive, velocity and acceleration equations for the component modules: rigid body, oscillating slider, two-link dyad, and rotating guide. The mechanism input module must be a driving crank.In this paper, this kinematic analysis technique is extended by incorporating dual slider, slider-crank, and inverted slider-crank modules, permitting mechanisms to be analyzed when a slider input, e.g. hydraulic or pneumatic cylinder, is involved.With this extension, most of the common compound planar mechanisms with lower pairs can be analyzed. However, there is still a class of mechanisms which cannot be analyzed in a direct fashion using the modular approach. These are mechanisms, such as the Watt “walking beam”, with more than two links between the moving end of the driver link and the frame. Such mechanisms can be analyzed using an inversion technique developed by Goodman[2], however; and the use of this technique with the modular technique is also discussed.The procedure developed is noniterative in nature and therefore can be conveniently programmed and executed on a minicomputer. 相似文献
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为使脉动血流发生器产生稳定的脉动性血流,提出了一种新型非圆齿轮-曲柄滑块式驱动机构,运用非圆齿轮副和曲柄滑块机构的组合传动来实现血流的脉动。在满足人体血流脉动前提下,为使设计的机构运行平稳,采用2段三次Hermite插值多项式来对该机构输出构件的加速度曲线进行拟合,再由加速度曲线方程及其边界条件推导出速度、位移和跃度曲线方程,运用拟合得到的输出构件运动学曲线方程推导出非圆齿轮副节曲线反求模型。根据实例求解分析得到的机构参数进行三维建模和虚拟样机实验,对比虚拟仿真实验和理论分析结果,发现所设计机构能够按照预期规律实现脉动血流,且该机构具有良好的运动学特性,同时验证了所构建的运动学曲线方程及所建立的运动学分析模型的正确性。 相似文献
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为了研究运动副间隙的存在对机构的稳定性产生的影响,本文采用了动力学分析的方法,以含间隙曲柄滑块机构为例建立了数学模型,从影响机构精度的不同原因入手,分析机械的误差来源及特征。并对曲柄滑块机构进行了非线性分析后,对其建立了逆模型,并分别进行了有逆模前馈的开环控制和PID加逆模前馈的闭环控制来控制不稳定性。实验结果表明:利用MATLAB软件中的动态仿真工具Simulink建立的含间隙机构动力学仿真模型,与理想无间隙机构相比,含间隙机构稳定性较差;逆模前馈补偿器有效地减小了系统的非线性误差,提高了曲柄滑块机构的控制精度。 相似文献