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本文通过数学分析,建立了真球式浪形保持架和眼睛式浪形保持架兜孔径向游隙的计算公式。利用所推导的公式计算了305型单列向心球轴承保持架兜孔的极限游隙值。 相似文献
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在机器人实际工况中,针对含有薄壁四点接触球轴承的机器人腕部关节系统的运动稳定性问题,对腕部系统模型进行了简化设计和仿真研究。在考虑薄壁结构的弹性变形和动态接触作用耦合影响的基础上,建立了刚柔耦合工业机器人腕部关节系统模型,分析了不同受载工况和正反转驱动下的变形规律和动态特性。首先,基于多体动力学和Hertz接触理论,设计了包含薄壁四点接触球轴承和中空轴及基座的腕部关节系统刚柔耦合接触动力学仿真模型;然后,考虑薄壁中空轴、基座、轴承套圈和保持架的结构弹性变形、钢球和套圈滚道、保持架的动态接触作用,研究了机器人腕部关节系统两种实际工况对保持架和钢球角速度、保持架和薄壁基座振动位移、钢球与套圈的动态接触力的影响;最后,计算分析了两种工况下腕部关节系统的动态载荷规律和振动响应特性。研究结果表明:在相对较大的径向载荷作用下,保持架和钢球会出现打滑现象,速度呈现周期波动,保持架和基座具有更好的运动稳定性,其薄壁轴承内部载荷降低,主副接触对均承担联合载荷,轴承内部载荷稳定性也更好。该仿真模型及结果可以为薄壁腕部关节系统的动力学分析与设计提供参考。 相似文献
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利用ADAMS软件建立了套圈、钢球和保持架的角接触球轴承多体接触动力学仿真模型,在不同转速、径向力和引导游隙下,运用ADAMS软件仿真分析了角接触球轴承的动力学性能、保持架的波动冲击和稳定性,讨论了角接触球轴承的接触力、保持架的角加速度及其质心运动轨迹等的仿真结果。研究结果表明,保持架的波动和稳定性与角接触球轴承的运动速度、引导间隙和载荷等因素相关。多体动力学模型和分析结果为不同工况下使用的角接触球轴承的动态设计和疲劳寿命提供了参考方法。 相似文献
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并联机构在运动过程中存在弹性变形和刚柔耦合效应,对机构的运动及其稳定性具有较大影响。针对上述问题,以3自由度刚柔耦合并联机器人为研究对象,基于线性多体系统传递矩阵法(线性MSTMM)建立了刚柔耦合并联机器人多体系统模型和拓扑结构模型,推导了整体系统的空间转换方程和动力学方程;通过Matlab软件建立了机器人SimMechanics仿真模型,并基于PID控制策略对机器人进行了轨迹跟踪的仿真研究。结果表明,机器人末端输出的实际运动轨迹与期望轨迹基本吻合,机器人系统运动相对稳定,验证了该建模方法的正确性和有效性,为进一步对并联机构进行研究提供了一定的理论依据。 相似文献
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航空发动机主轴高速圆柱滚子轴承保持架柔体动力学仿真 总被引:1,自引:0,他引:1
在轴承动力学分析基础上,考虑保持架的柔性特性,采用修正的Craig-Bampton子结构模态综合法建立了航空发动机主轴高速圆柱滚子轴承保持架柔体动力学方程,利用ADAMS系统开发了圆柱滚子轴承刚柔耦合动力学仿真软件,并对保持架动态性能进行仿真,着重对轴承工况和结构参数与保持架动态特性的关系进行了研究。仿真结果表明:振动应力引起的疲劳失效多发生在保持架梁处;高速轻载工况下保持架易产生较大的打滑;径向游隙适当增大有利于降低打滑率;兜孔间隙与引导间隙比值大于1后保持架运动平稳性明显变差。最后,试验验证表明,柔性保持架动力学模型所得结果比刚性模型所得结果更接近试验结果。 相似文献
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Dynamics Analysis of a Parallel Mill-turn Tool Spindle Head Driven by Dual-linear Motors Using Extended Transfer Matrix Method 总被引:1,自引:0,他引:1
WU Wenjing LIU Qiang School of Mechanical Engineering Automation Beihang University Beijing 《机械工程学报(英文版)》2011,(5):859-869
The hybrid dynamics of multi-rigid-body and multi-flexible-body system becomes the mainstream of multi-body dynamics.Currently there lacks a compact approach to model the hybrid dynamics,especially in modern machine tool application,due to the difficulty of solving the hybrid equations or the limitation of current software when dealing with the hybrid dynamics.The extended transfer matrix method(E-TMM),which extends elements in three-dimensional space with higher matrixes,is proposed to simplify the modeling process of the hybrid dynamics.The E-TMM modeling approaches of 3 basic elements including 3D vibrant rigid body,joint and flexible body are studied in details.A parallel mill-turn tool spindle head unit driven by dual-linear motors is chosen as a plant to demonstrate the E-TMM modeling process.By using E-TMM,the spindle head unit is simplified as a topological network consisting of the three types of element,i.e.,3D vibrant rigid body,joint and flexible body,including 11 rigid bodies,14 joints and 1 3D-Timoshenko beam.Then the dynamic model of the system can be easily obtained by deducing the element-network by means of state vector transformation.The dynamic characteristics of the spindle head,such as natural frequencies,dynamic flexibility,etc.can be predicted by solving the obtained model.Experiment verification indicates that the E-TMM is valid with enough accuracy in the dynamic analysis of the parallel mill-turn tool spindle head.The E-TMM is capable of modeling the dynamics of machine tool structure with no requirements of deducing and solving the sophisticated differential equations.Moreover,the E-TMM provides a simple and elegant tool for hybrid dynamic analysis in future dynamic design of machine tools. 相似文献
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SIMPACK中的柔性体动力学仿真分析研究 总被引:1,自引:0,他引:1
介绍了通过结构有限元分析软件ANSYS和多体系统动力学分析软件SIMPACK的结合,在SIMPACK软件中进行刚柔耦合系统动力学分析的柔性体处理方法,并以铁道货车转K6型转向架为实例,研究了在SIMPACK软件中采用刚柔耦合方法进行铁道车辆系统动力学仿真分析的关键问题。 相似文献
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肘杆式压力机主传动系统动态仿真及优化设计 总被引:1,自引:0,他引:1
介绍了一种新型的由伺服电机驱动的肘杆式数控冲床。建立了整个驱动系统的三维数字化模型。通过对肘杆系统工作过程的分析并利用多体系统动力学软件(ADAMS)对模型进行了动力学模拟和优化设计。得到了模型的最优结构参数,提高了冲压效率。 相似文献
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Wu Nanxing Department of Mechanical Engineering Jingdezhen Ceramic Institute Jingdezhen China Sun Qinghong Department of Mechanical Engineering Southeast University Nanjing China Zhang Yonghong School of Mechanical Power Engineering Shanghai Jiaotong University Shanghai China Yu Dongling Department of Mechanical Engineering Jingdezhen Ceramic Institute Jingdezhen China 《机械工程学报(英文版)》2005,18(4):566-570
Based on multi-body system theory and the mainshaft system of precision NC lathe as object investigated,it is treated as a coupled rigid-flexible multi-body system which is made up of some rigid and elastic bodies in an especial linking mode.And a dynamic model is established.The problems of computing vibration characteristics are resolved by using multi-body system transfer matrix method.Results show that the mainshaft system of NC lathe is in the stable and reliable working area all the time.The method is simple and easy,the idea is clear.In addition,the method can be easily used and popularized in the other multi-body system. 相似文献
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根据振动力学以及多刚体系统动力学原理,分析了某铰接式自卸车的振动模型,同时进行合理的简化,建立了集中质量的虚拟样机模型,并在虚拟样机软件ADAMS上进行仿真。通过与试验的对比,也验证了仿真方法可行,仿真模型可靠。因此可用该模型计算随机激励下铰接式自卸车的响应,并进行整车动力学分析和悬架系统参数优化设计。 相似文献
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This paper presents the design process of a controller for bandwidth-limited active hydro-pneumatic suspension employed by an off-road vehicle based on co-simulation technology. First, a detailed multi-body dynamic model of the vehicle is established by using the ADAMS/View software package, which is followed by validation using a vehicle field test. Second, a combined PID and fuzzy controller is designed for the bandwidth-limited active suspension system and then programmed by means of S-functions in Matlab/Simulink, to which a data exchange interface with ADAMS/View is also defined. Third, the proposed control algorithm is implemented on the multi-body dynamic vehicle model to enable the co-simulation to run repeatedly until a more practical controller is achieved. In the end, the proposed active suspension system is compared with a conventional passive system. Simulation results show that the proposed active suspension system considerably improves both the ride and handling performance of the vehicle and therefore increases the maximum traveling speeds even on rough roads. 相似文献