三对传力杆空间相交轴RCCR机构的力学分析—传力杆受推力时的影响

发布时间：2018-01-31 10:23

本文关键词： RCCR 动力分析力学仿真　出处：《郑州大学》2012年硕士论文　论文类型：学位论文

【摘要】：空间RCCR机构是有着广泛运用前景的机构。目前对这种机构的研究也取得了一定的研究成果。它可以作为一种较为新型的联轴器使用。它的轴线夹角理论上范围为0度到180度之间。在考虑到实际情况和机构实体的情况下,这个范围会略有缩小。这种机构不仅可以做为联轴器使用,还可以运用到泵、马达等结构中。在其多对传力杆的情况下,对力的分担使得机构的整体受力比较平衡,而且此机构结构相比来说比较简单,连接全都是低副,使得机构运动更平稳、耐磨损性能更好。本文采用示力副法对机构在整体坐标系下进行力的分析与求解。首先对空间RCCR机构静力学的分析与求解。在求解过程中,忽略构件间的摩擦力与构件所受的重力且构件间的连接为无间隙连接。由于空间RCCR机构在三对传力杆受端面力的情况下,每对传力杆与其它传力杆不是同时受端面力,所以在求解过程中进行分段进行讨论。相对于每对传力杆来说,其受端面力的转角总和为180度,但是从整体来说每相隔60度机构的受力情况就会产生变化,所以在计算时每隔60度对机构受力进行计算。由于端面力是变化的,所以根据轴8所受力矩平衡求出随着转角变化的输入力矩。然后求出机构各个运动副所受的约束力和约束力矩。在静力分析求解的基础上,又对机构做了动力上的分析与求解。在求解时,考虑到了各个构件所受的惯性力的影响,仍然采用示力副法在整体坐标系下进行求解,解出各个运动副所受的约束力与约束力矩。在SolidWorks环境中建立了空间RCCR机构的三维模型,由于空间RCCR机构的三对传力杆属于柔性体,所以该机构不适合在SolidWorks环境中进行动力学仿真分析。因此将该模型导入ADAMS中进行动力仿真分析。得出仿真数据并绘出各个运动副所受到的约束力和约束力矩随机构结构参数变化曲线图,并与理论计算所得出的结果进行对比,对比结果表明两者非常吻合。分析了空间RCCR机构各个运动副所受约束力和约束力矩之间的相互影响关系,其中传力杆相连接的旋转副所受到Z方向上的力存在着一定的力的分配关系,并且三个旋转副相互影响,Z方向所受的力直接影响到所在构件其它运动副所受的约束力及约束力矩。分析得出主要机构参数对改善机构受力的影响。其中传力杆夹角及机构的偏心距对机构受力影响比较大,得出了增大夹角可以减小机构的受力等结论。
[Abstract]:The space RCCR mechanism is a kind of mechanism with wide application prospect . It can be used as a new type of coupling . It can be used as a new type of coupling . It can be used as a coupler . It can be used as a coupling and can be applied to the structure of pump , motor , etc . In the case of multiple pairs of force transmission rods , the load sharing of force makes the overall force of the mechanism be balanced , and the mechanism structure is relatively simple , all the connections are low pairs , so that the mechanism moves more smoothly and the wear resistance is better . In this paper , the analysis and solution of the force of the mechanism in the whole coordinate system are studied by means of the representation method . In the process of solving , the force of each pair of force - transmitting rods and other force - transmitting rods is calculated . The three - dimensional model of the space RCCR mechanism is established in the environment of Solidworks . Since the three pairs of force transmission rods of the space RCCR mechanism belong to the flexible body , the mechanism is not suitable for the dynamic simulation analysis in the environment of Solidworks . Therefore , the model is imported into ADAMS for dynamic simulation analysis . The simulation data is drawn and the binding force and the constraint moment of each motion pair are plotted along with the change of the structural parameters of the mechanism , and compared with the results obtained by the theoretical calculation . This paper analyzes the mutual influence between the binding force and the restraining moment of each kinematic pair of the space RCCR mechanism , wherein the force in the Z direction is influenced by the force in the Z direction by the rotating pair connected with the force transmission rod , and the force exerted by the Z direction directly affects the binding force and the restraining moment of the other movement pairs of the component .

【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH112

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