考虑间隙的槽轮机构键合图建模与仿真

发布时间：2019-02-28 10:18

【摘要】：槽轮机构以其结构简单,传动效率高,工作可靠,设计和制造方便,以及能较平稳、间歇进行转位等优点,广泛应用于自动机械传动装置中。但是槽轮机构在工作时有冲击,引起运动系统振动,其适用范围受到一定的限制。研究表明引起槽轮机构冲击振动的原因包括两方面：一方面是圆柱销进出槽轮槽时的柔性冲击,另外一方面是由运动副之间间隙引起碰撞而产生。目前,国内外关于槽轮机构间隙接触碰撞的研究还比较少,因此,对槽轮机构的间隙接触碰撞副进行动力学研究是有实际意义的。对于槽轮机构间隙接触碰撞问题的研究,重点是解决其建模和计算问题,使动力学研究更加接近其真实过程,以达到改进设计、减少费用、降低振动和噪声的目的。本文利用弹性碰撞理论,基于开关键合图建模理论和20-sim仿真软件,对槽轮机构间隙接触碰撞问题展开研究,同时对槽轮机构动力学特性进行分析,比较了机构的理想状态与含间隙碰撞副的不同动态特性,从而说明运动副间隙很大程度上影响槽轮机构的运动特性,使机构的实际运动和理想运动之间产生偏差,并且运动副间隙之间产生碰撞,引起构件的振动,产生噪声,加速磨损,降低工作效率。本文的研究表明,利用弹性碰撞理论中的弹簧-阻尼模型对槽轮机构间隙接触碰撞问题的研究,比较接近槽轮机构的实际运动状态,而且开关键合图建模理论在槽轮机构动态特性研究时工作过程离散化的处理中建模方法简单,最后,利用基于键合图理论的仿真软件20-sim对槽轮机构开关键合图模型仿真,得到仿真结果表明所建立的系统动力学模型是正确有效的,与传统的动力学分析方法相比,模型正确且更简明,更适合计算机仿真计算,为槽轮机构动态特性的研究提供了一种新方法与途径。
[Abstract]:With the advantages of simple structure, high transmission efficiency, reliable work, convenient design and manufacture, stable and intermittent transposition, the slotted wheel mechanism is widely used in automatic mechanical transmission devices. However, the slotted-wheel mechanism has the impact when it works, which causes the vibration of the moving system, and its application range is limited to a certain extent. The research shows that the impact vibration of the grooved wheel mechanism is caused by two aspects: one is the flexible impact caused by the cylindrical pin in and out of the groove wheel slot, the other is the collision caused by the clearance between the moving pairs. At present, there is little research on gap contact collision of grooved wheel mechanism at home and abroad. Therefore, it is of practical significance to study the dynamics of gap contact collision pair of grooved wheel mechanism. In order to improve the design, reduce the cost and reduce the vibration and noise, the research on the gap contact collision of the grooved wheel mechanism is focused on solving its modeling and calculation problems, and making the dynamics research closer to its real process in order to achieve the purpose of improving the design, reducing the cost and reducing the vibration and noise. Based on the theory of elastic collision, based on the open key graph modeling theory and 20-sim simulation software, the problem of gap contact collision of grooved wheel mechanism is studied in this paper, and the dynamic characteristics of grooved wheel mechanism are analyzed at the same time. The ideal state of the mechanism is compared with the different dynamic characteristics of the collision pair with clearance, which shows that the clearance of the pair of motion has a great influence on the motion characteristics of the slotted-wheel mechanism, which causes the deviation between the actual motion and the ideal motion of the mechanism. And the collision between the clearance of the moving pair causes the vibration of the component, produces noise, accelerates wear, and reduces the working efficiency. The research in this paper shows that the spring-damping model in elastic collision theory is more close to the actual motion state of the grooved-wheel mechanism in the study of the gap contact collision problem of the grooved-wheel mechanism. Moreover, the modeling method is simple in the discretization of the working process in the study of the dynamic characteristics of the grooved mechanism. Finally, the key graph model of the slotted mechanism is simulated by using the simulation software 20-sim based on the bond graph theory. The simulation results show that the established system dynamics model is correct and effective. Compared with the traditional dynamic analysis method, the model is correct and more concise, and more suitable for computer simulation calculation. A new method and approach is provided for the study of dynamic characteristics of slotted mechanism.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH112

【引证文献】