滚子链传动横向振动稳定性分析

基于多体动力学理论,建立了滚子链传动系统横向振动动力学模型。该模型考虑了链条张力及链节转动惯性对链系统横向振动的影响。在此基础上,通过算例仿真,对滚子链系统横向振动固有特性进行了研究,并分析了不同边界激励条件对滚子链传动系统横向振动稳定性的影响。研究结论可为指导各种含链传动系统的机械装置的动态分析与设计提供借鉴。     

新齿滚子链传动设计及动态特性分析

针对链传动中链条及链边振动较大、链条铰链磨损等动态问题,设计一种新齿滚子链传动,建立滚子链及新齿滚子链啮合传动模型,并对链传动动态特性进行仿真分析,研究了链传动在不同转速下啮合冲击力、不均匀系数、摩擦力和链传动横向振动的变化规律。研究结果表明:随着转速的增加,链传动过程中的啮合冲击力、链波动均增加,不均匀系数、摩擦力均减小;在转速小于6000r/min时,链传动横向振动较小,当转速大于6000r/min时,链传动横向振动急剧增加;新齿滚子链传动比标准滚子链传动的啮合冲击力、摩擦力小,传动平稳性好。     

重力影响下滚子链传动的横向振动分析

基于多自由度系统的振动理论,建立了竖直拉伸下滚子链传动系统横向振动动力学模型。考虑了链条重力及张力对链传动系统横向振动固有特性的影响,并利用M atlab软件对该系统横向振动固有频率进行了数值分析。在此基础上研究了不同边界激励条件对该链传动系统横向振动稳定性的影响。所得结论可为用于生产实践中的机械传动装置的动态分析与设计提供参考。     

滚子链传动振动特性的研究

提出了滚子链传动的横向振动新模型，依据新模型导出了滚子链传动时横向动力响应的表达式     

大行程机械臂系统滚子链传动特性研究

针对目前机械臂传动系统设计制造成本较高,在一般简易场合使用局限等问题,给出一种基于滚子链传动的新型机械臂系统,并针对系统关键部件滚子链传动系统,通过运用多体动力学理论和拉格朗日方法,分析得到机械臂系统滚子链传动横向振动模态特性。研究结果表明:通过对比大行程滚子链传动与非滚子链传动机械臂运行特性,本模型所提出的具有制造成本较低新型机械臂系统方案可以较好地解决一般简易场合使用传统机械臂使用局限的问题;在理想轨迹下滚子链传动与非滚子链传动机械臂运行特性差异较小,满足一般对操作精度要求不高的机械臂使用要求;链传动横向振动各阶固有频率随着链长的增长而减小,传动速度对链传动横向振动影响较小,链条张力对链传动横向振动影响呈现线性变化关系,随着张力的增加固有频率也逐渐增加。     

链传动的振动和噪声研究现状与发展

综述了链传动的振动和噪声的研究历史和现状，对链传动振动和噪声的来源进行了分析；认为链轮轮齿、链节形状、材料弹性和链条与链轮的啮合动力学的基础性研究是链传动振动和噪声的深入研究的前提。     

汽车发动机正时链带阻尼装置的横向振动分析

为了分析阻尼装置对汽车发动机正时链横向振动的影响,把阻尼装置抽象为单自由度的质量-弹簧系统,利用多自由度系统理论建立基于有限个集中质量分布的链传动横向振动模型,得到模型的振动微分方程.在此基础上,计算了固有频率和主模态,分析了阻尼装置安装位置对系统振型和阻尼装置质量、刚度对链传动横向振动频率的影响,提出了设计阻尼装置的几种措施.     

带弹性撑紧装置的滚子链传动横向振动分析

基于多体动力学理论,建立了带弹性撑紧装置的滚子链传动系统横向振动动力学模型.模型中将撑紧装置简化为一个导轨,导轨一侧具有弹性支撑,另一侧与多个链节接触.通过算例仿真,分析了弹性撑紧装置对抑制链传动横向振动所发挥的重要作用.     

链传动中纵向振动问题的研究

利用多自由度系统的振动理论研究了链条的纵向振动问题,在对滚子链纵向振动问题建立力学模型的基础上,推导了链条的纵向振动方程式,给出了计算固有频率的公式及主模态的计算方法,并且提出了防止链传动中链条共振的几种措施。     

大节距轨迹约束型输送链振动特性分析

振动是影响链传动性能的主要因素。与普通滚子链传动不同,由于轨道的约束,大节距输送链的主要振动形式为沿着轨道方向的纵向振动。针对此问题,建立了大节距轨迹约束型输送链模型及其等效构型。根据多自由度系统振动原理,建立了链条的动力学模型,并求出其固有频率和主振型。根据多自由度系统强迫振动理论,计算了链条在一个周期内的动态响应。以上分析表明,大节距轨迹约束型输送链纵向振动固有频率较大,空载工况下的受迫振动响应较弱,链条整体振动较普通滚子链有很大的改善。     

Dynamic Modeling of a Roller Chain Drive System Considering the Flexibility of Input Shaft

Roller chain drives are widely used in various high-speed, high-load and power transmission applications, but their complex dynamic behavior is not well researched. Most studies were only focused on the analysis of the vibration of chain tight span, and in these models, many factors are neglected. In this paper, a mathematical model is developed to calculate the dynamic response of a roller chain drive working at constant or variable speed condition. In the model, the complete chain transmission with two sprockets and the necessary tight and slack spans is used. The effect of the flexibility of input shaft on dynamic response of the chain system is taken into account, as well as the elastic deformation in the chain, the inertial forces, the gravity and the torque on driven shaft. The nonlinear equations of movement are derived from using Lagrange equations and solved numerically. Given the center distance and the two initial position angles of teeth on driving and driven sprockets corresponding to the first seating roller on each side of the tight span, dynamics of any roller chain drive with two sprockets and two spans can be analyzed by the procedure. Finally, a numerical example is given and the validity of the procedure developed is demonstrated by analyzing the dynamic behavior of a typical roller chain drive. The model can well simulate the transverse and longitudinal vibration of the chain spans and the torsional vibration of the sprockets. This study can provide an effective method for the analysis of the dynamic characteristics of all the chain drive systems.     

基于状态空间法的风机传动链振动控制

为深入分析风机传动链的动态特性,并实现传动振动控制的定量分析。推导了传动链数学模型,进而建立了传动链状态空间方程。基于状态空间方程,讨论了传动链振动控制的方法,并研究了传动链加阻带通滤波器传递函数设计依据。然后通过实例化设计实验了整个分析过程的实例化。通过bladed仿真和现场验证,证明了控制策略的有效性。     

Clearance Influence on Dynamic Response of Intermittent Roller Chain Drive

The clearances appear in chain link hinges induced by manufacturing tolerance or wear of components are the most important factor that influences the dynamic performance of the intermittent roller chain drives.Due to the existence of the clearances in chain link hinges,the serious impact vibration phenomenon which influences the stability and the position accuracy of the chain drive system would be caused in the intermittent motion.But,the problem may be that a reasonable modeling on the chain with clearances is difficult due to the large clearance's number in chain system and the fact that the clearance' size are different.Currently,the studies on the dynamics of the intermittent roller chain considering the multi-clearance' joints are rare.Most research works have only focused on the constant moving chains.Taking the intermittent roller chain system as an object,this paper designs and builds the experimental device of this kind of mechanical system.The Longitudinal vibration response of the intermittent chain under the different motion laws was tested.The experimental study shows that the clearances presented in chain link hinges can cause severe impact vibration in the intermittent motion of chain.In subsequent work,the dynamic model of the intermittent roller chain system with the multi-clearance' joints was established.By calculating the dynamic response of this kind of mechanical system under the different motion laws,the effect of the clearances on the dynamic response of the intermittent chain drive system was analyzed.The theoretical simulation shows that the serious impact vibration phenomenon of the chain system can be caused by the clearances at the start accelerating period,and the chain drive system is often accompanied by the severe shock and vibration at the moment that the chain moves from the acceleration period to deceleration period.The research conclusions made by the experimental and theoretical studies indicate that the use of motion laws with small and continuous jerk at conversion point can effectively suppress the impact vibration at this point caused by clearances' effect.Additionally,the use of nonsymmetrical motion laws with small jerk approaching the end of the indexing period can obtain a smaller residual vibration.The presented motion law can provide an important reference for the improvement of the dynamic performance of the intermittent chain drive systems.     

滚子链传动的振动特性分析

链传动是一种重要的机械传动方式,但它受振动的影响很大.本文讨论链传动的振动的主要类型和引起振动的主要原因.     

高温气冷堆控制棒圆环链提升装置设计与分析

针对控制棒驱动系统故障处理需求,设计了圆环链提升装置辅助快速处理圆环链,实现控制棒驱动机构与控制棒的快速拆卸分离。为了避免圆环链及控制棒横向振动振幅过大,保证控制棒的安全以及圆环链的顺利提升,运用ADAMS建立了相应的虚拟样机模型,对圆环链和控制棒的振幅大小和振动规律进行了研究。通过物理实验和仿真结果,表明该装置可实现较小振动幅值下的圆环链提升过程,满足工程实际要求。     

Mechanism analysis and suppression strategy research on permanent magnet synchronous generator wind turbine torsional vibration

Torsional vibration of flexible drive chain is a historical issue. With the maximization development and the rotating machinery high-speed operation, the drive chain systems of large-scaled units become more and more complex, which makes the torsional vibration problems becoming increasingly prominent in recent years. This article deeply analyzed the small signal stability of large-scaled WECS based on CMT, elaborated the torsional vibration mechanism and reasons for the first time and pointed out torsional vibration is caused by the disturbance wind and the DPC strategy. The disturbance wind is an external stimulus and can produce a low-frequency torsional vibration at the same frequency as wind speed. The DPC could weaken the drive chain damping. If the total damping of drive chain is negative, the unstable torsion vibration will occur. And if the drive chain is still a under-damped dynamic, the high-frequency torsional vibration at natural frequency will be generated. Therefore, large-scaled WECS must have damping control. This study found that appropriate enhancing drive chain stiffness could reduce low-frequency torsional vibration caused by wind speed. Therefore, a damping and stiffness compensation control method was proposed to suppress the torsional vibration. Compared with the conventional damping control, the new method not only can suppress the high-frequency torsional vibration but also has a good restraining effect on the low-frequency torsional vibration. Furthermore, the detailed design procedures including the calculation of injection damping and stiffness were given in this paper. Finally, the correctness and effectiveness of our analysis were further verified by the simulation experiments     

机床切削振动的一个诊断实例

机床振动是一个比较复杂的问题，往往很难解决。生产实际中遇到了振动现象，我们用频谱分析仪测出切削时的共振频率，通过计算得出传动链中各轴和轮的旋转频率，将二者进行比较，找出振源，解决了问题。     

风力机结构耦合振动分析

采用通用动态尾流理论进行风力机气动力学的计算分析,并用MATLAB/Simulink进行编程,建立了风力机传动链的数学模型。在MATLAB/Simulink中进行传动链系统的编程运算,建立了风力机ADAMS柔性多体结构动力学仿真模型,并利用MATLAB/Simulink和ADAMS进行风力机振动性能的联合仿真。仿真时将气动载荷加载到风力机叶片结构上,将传动系统模型的反扭矩加到ADAMS风轮模型上,同时考虑风力机的结构变形对气动性能、传动性能产生的影响。仿真最终实现了风力机系统振动性能耦合分析,其数据同实验测试数据比较表明,该联合仿真方法可以较好地模拟风力机的振动特性。