行星传动系统均载特性研究

发布时间：2018-03-10 21:40

本文选题：行星传动　切入点：动力学　出处：《大连理工大学》2012年硕士论文　论文类型：学位论文

【摘要】：行星传动利用多个行星轮分担载荷,形成功率分流,并且能较好利用内齿圈的空间容积和内啮合的高承载性,具有体积小、传动比大、效率高、工作平稳、承载力强等优点,因此广泛应用于汽车、工程机械及航空航天等领域。但由于在生产装配过程中不可避免的制造误差与安装误差,会使各行星轮载荷分配不均。行星传动的载荷分配不均,会严重降低传动系统承载能力,并产生噪音、振动、轮齿点蚀等,从而降低传动系统可靠性。因此,有必要对行星传动系统的均载特性进行研究。本论文主要开展了以下研究工作：首先,采用集中参数法,建立了行星传动系统动力学模型。在引入轮齿弹性变形协调条件,考虑系统综合误差的前提下,基于牛顿第二定律及动量矩定理,建立行星传动多自由度动力学方程；运用有限元法进行行星传动轮齿准静态分析,得到时变啮合刚度函数；运用Runge-Kutta法求解动力学方程。其次,分析了行星传动系统动力学均载特性。通过求解实例,得到传动系统时域响应；分析了输入转速、系统刚度和齿轮误差对动力学均载系数的影响；开发了行星传动系统动力学均载特性分析软件。结果显示,系统动力学载荷分配不均匀系数随转速升高而增大；中心构件支承刚度适当减小,会使动力学载荷分配不均匀系数降低；太阳轮偏心误差对动力学载荷分配不均匀系数影响比较显著。再次,对行星传动系统均载特性进行了有限元分析。对行星齿轮系统的有限元参数化建模：应用二维弹性梁单元模拟行星架,多点约束方程模拟回转副,弹簧单元模拟轴承支承；建立了行星传动接触模型。通过对实例的计算,得到行星传动有限元均载特性。最后,对部分现有均载技术的均载性能进行了分析。研究了柔性销技术的扭转顺从特性和动力学均载特性；分析了太阳轮、行星架、内齿圈单独浮动时系统的动力学均载性能。结果显示,中心构件浮动均能有效提高系统均载性能。
[Abstract]:The planetary transmission uses many planetary wheels to share the load, forms the power split, and can make better use of the space volume of the inner gear ring and the high bearing capacity of the inner meshing. It has the advantages of small volume, large transmission ratio, high efficiency, steady working, strong bearing capacity, etc. Therefore, it is widely used in automobile, construction machinery, aerospace and other fields. However, due to the inevitable manufacturing error and installation error in the production and assembly process, the load distribution of the star wheel will be uneven and the load distribution of the planetary transmission will be uneven. The load carrying capacity of transmission system will be seriously reduced, and the noise, vibration and pitting of gear teeth will be produced, thus the reliability of transmission system will be reduced. Therefore, it is necessary to study the uniform load characteristics of planetary transmission system. The main work of this thesis is as follows:. First of all, the dynamic model of planetary transmission system is established by means of lumped parameter method. Based on Newton's second law and the theorem of moment of momentum, the elastic deformation coordination condition of gear teeth is introduced, and the comprehensive error of the system is considered. The dynamic equation of planetary transmission with multiple degrees of freedom is established, the quasi static analysis of planetary transmission gear teeth is carried out by using finite element method, and the time-varying meshing stiffness function is obtained, and the dynamic equation is solved by Runge-Kutta method. Secondly, the dynamic load sharing characteristics of planetary transmission system are analyzed. The time-domain response of the transmission system is obtained by solving an example, and the effects of input speed, system stiffness and gear error on the dynamic load sharing coefficient are analyzed. A software for the analysis of dynamic load sharing characteristics of planetary transmission system is developed. The results show that the uneven coefficient of dynamic load distribution increases with the increase of rotational speed, and the supporting stiffness of the central member decreases appropriately. The non-uniform coefficient of dynamic load distribution will be reduced, and the eccentric error of solar wheel will have a significant effect on the non-uniform coefficient of dynamic load distribution. Thirdly, the finite element analysis of the planetary transmission system is carried out. The finite element parametric modeling of the planetary gear system is carried out. The two-dimensional elastic beam element is used to simulate the planetary frame, and the multi-point constraint equation is used to simulate the rotary pair. Spring element simulates bearing support, establishes contact model of planetary transmission, and obtains finite element load-sharing characteristics of planetary transmission by calculating examples. Finally, the load-sharing performance of some existing load-sharing technologies is analyzed. The torsional compliance characteristics and dynamic load-sharing characteristics of flexible pin technology are studied, and the sun wheel and planetary frame are analyzed. The results show that the central component floating can effectively improve the load sharing performance of the system.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH132.425

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