链传动的横向振动研究
发布时间:2018-04-13 03:38
本文选题:链传动 + 横向振动 ; 参考:《中北大学》2012年硕士论文
【摘要】:链传动为啮合传动,具有结构简单、效率和可靠性高以及传递功率和速度范围大等诸多优点。链传动的应用范围很广,如农业机械、采矿、起重、冶金、运输、石油钻机、化工、汽车、纺织以及医疗器械等。在工程应用中随着对链传动速度和精度要求的提高,为解决链传动的平稳性、共振和链传动失效等问题,对链传动横向振动的研究已显得十分重要。本论文对链传动横向振动的研究内容如下: 考虑将链传动系统中的链条看成有限集中质量分布的多自由度系统,用分析力学方法中的拉格朗日方程建立了链传动系统横向线性振动离散模型,借助matlab软件分析了链条张力、链节质量以及链节节距对链传动横向振动模态特性的影响规律,并在不同边界激励条件下分析了链传动横向振动的稳定性。 考虑将链传动系统中的链条看成轴向运动弦线,用弹性力学方法建立了链传动系统横向非线性振动连续模型,模型中将链条看成线性弹性体材料,考虑了链传动横向振动中轴向变形的几何非线性因素,并直接对非线性偏微分方程进行多尺度法分析,通过消除近似方程中的长期项得到可解性条件,,进而得到振幅和相位角的常微分方程组,分析了系统的稳态响应,并注意到链条轴向运动速度波动频率会影响方程中的长期项,分别讨论了当链条轴向运动速度波动频率为系统固有频率的两倍及其他频率区间时的振动稳定性。
[Abstract]:Chain transmission is a meshing transmission with many advantages, such as simple structure, high efficiency and reliability, large range of transmission power and speed, etc.Chain drives are used in a wide range of applications, such as agricultural machinery, mining, lifting, metallurgy, transportation, oil drilling, chemical, automotive, textile and medical equipment.In engineering application, with the improvement of the speed and precision of the chain drive, it is very important to study the transverse vibration of the chain transmission in order to solve the problems of the stability, resonance and the failure of the chain transmission.The research contents of this paper are as follows:Considering the chain in chain transmission system as a multi-degree of freedom system with finite concentrated mass distribution, a discrete model of transverse linear vibration of chain transmission system is established by using Lagrangian equation in analytical mechanics method, and chain tension is analyzed by matlab software.The influence of chain joint mass and pitch on the transverse vibration modal characteristics of chain transmission is studied. The stability of chain drive transverse vibration is analyzed under different boundary excitation conditions.The chain in the chain transmission system is considered as an axial moving string, and a continuous model of the transverse nonlinear vibration of the chain transmission system is established by using the elastic method. In the model, the chain is regarded as a linear elastic material.In this paper, the geometric nonlinear factors of axial deformation in transverse vibration of chain drive are considered, and the nonlinear partial differential equation is directly analyzed by multi-scale method. The solvability condition is obtained by eliminating the long-term term in the approximate equation.Then the system of ordinary differential equations with amplitude and phase angle is obtained. The steady-state response of the system is analyzed, and it is noted that the frequency of velocity fluctuation in the axial motion of the chain will affect the long-term term of the equation.The vibration stability of the chain is discussed when the velocity fluctuation frequency of the chain is twice the natural frequency of the system and other frequency ranges.
【学位授予单位】:中北大学
【学位级别】:硕士
【学位授予年份】:2012
【分类号】:TH132.45;TB533.1
【参考文献】
相关期刊论文 前3条
1 荣长发;链传动的振动和噪声研究现状与发展[J];机械传动;2004年02期
2 荣长发;张明路;;滚子链传动的振动特性分析[J];机械传动;2006年04期
3 杨玉虎,刘晓玲,张策,庄泓刚;套筒滚子链的动力学建模研究[J];中国机械工程;2005年16期
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