【作者】 贾银军；

【导师】 段宝岩；

【作者基本信息】 西安电子科技大学 ， 机械电子工程， 2008， 硕士

【摘要】 机构的运动副是连接两构件并允许二者有相对运动的环节,机械系统中运动副间隙是不可避免的。由于运动副间隙的存在,破坏了理想的机构模型,从而使机构的实际运动与理想运动之间出现偏差。运动副间隙对机械系统性能的影响已不容忽视。因此,研究含间隙机构的运动学和动力学具有重要的理论意义和实用价值,含间隙机构动力学已成为机构动力学的前沿研究课题之一。本文应用弹簧阻尼模型,进行动力学建模,对相关参数的确定进行了深入分析。利用反复碰撞过程中速度的不断变化,对弹簧阻尼模型的参数进行修正。另外,对间隙模型的各影响因素(材料特性、构件质量、摩擦系数、销和套筒半径值等)进行分析,找到了主要影响因素。以曲柄滑块为例,在重力环境下分析了全刚体、考虑构件柔性机构的运动,得到间隙取值与机构性能的函数关系式。本文另一部分对某空间展开机构的收拢状态和展开状态进行有限元建模和动力学分析,得到了对工程有参考价值的结果。更多还原

【Abstract】 The joint of mechanism is a unit which links two components and allows them to move relatively. In a mechanical system, joint clearance is unavoidable, which leads to deviation between actual model and ideal model. Therefore, the study of kinematics and dynamics of mechanisms with clearance is of great value theoretically and practically, and the dynamics with clearance has become one of the forefront research topics.In this paper, spring damping model is used to build dynamic model, and deep analysis of related parameters is done. According to constant changes of velocity during the repeated collisions, parameters of the spring damping model is modified. Besides, main ones are found after the analysis of influencing factors of the spring damping model, such as material properties, component weights, friction coefficients, and radius of pin and sleeve, etc. Taking a crank slider as an example, the motion in the gravity environment entire rigid bodies and with flexible components considered are analyzed, and the function of clearance value to performance of mechanism is derived.The finite element modeling and dynamic analysis of a space deployable mechanism in both folded and deployed states are also introduced in this paper. Results that are valuable to the engineering are acquired.更多还原