单根多楔带传动系统的旋转振动及带横向振动计算方法的研究
发布时间：2019-06-21 04:08
【摘要】：自1970年以来,单根多楔带传动系统在汽车发动机前端附件驱动(Front End Accessory Drive,FEAD)系统中得到广泛的应用。多楔带传动系统是由离散系统(各带轮和张紧臂)以及连续系统(柔性多楔带)组成的混合动力学机械系统,其振动型式非常复杂。其包括各带轮的旋转振动、张紧器的摆动、带的空间三向振动(纵向、横向和侧向振动)及其与接触带轮之间的耦合振动,以及带还可能发生弯曲振动及弯扭复合振动等等。除此之外,为了避免系统的共振,系统的固有频率也是非常受关注的内容。我国对多楔带传动系统的研究起步较晚,现在还处于初期阶段,特别是对其动态特性的研究。于是,针对多楔带传动系统,作者开展了如下研究工作: 其一,以单根多楔带传动系统为研究对象,建立了适用于任意布置型式系统的旋转振动模型,并给出了其稳态及动态响应的求解方法。综合考虑带的纵向运动和各轮的旋转运动,推导了其运动方程并且给出了系统稳态分析的方法。对运动方程关于系统稳态做线性化处理,得到系统动态方程并给出了系统微幅振动响应的求解方法。就某发动机FEAD系统,计算了其振动响应。并且,对任意布置型式的轮系,给出了其统一的带段长、包角等参数的公式。 其二,以三轮-带多楔带传动系统为研究对象,建立了梁耦合振动模型。基于此模型,计算了带的横向振动。由于旋转模型主要是分析系统中的旋转振动,对于多楔带这一关键部件,只能间接地分析其纵向伸缩运动。实际系统中,多楔带横向振动对系统振动及带寿命影响较大。为了预测带的横向振动,作者又开展了较为复杂的梁耦合振动模型的研究。模型中,带简化为纵向运动伯努利-欧拉梁,各轮和张紧器简化为刚性旋转元件。应用边界值问题(BVP)求解技术计算了带横向位移的稳态解;带的横向振动位移为时间与空间的函数,应用迦辽金法将其离散为时间函数和空间函数之积,计算了各带的横向振动。实验测试了一三轮-带传动系统中带的横向振动和轮的旋转振动。并且通过对比计算结果与实测结果,验证了文中计算带横向振动方法的可行性。
[Abstract]:Since 1970, single multi-wedged belt drive system has been widely used in automobile engine front-end attachment drive (Front End Accessory Drive,FEAD) system. Multi-wedged belt transmission system is a hybrid dynamic mechanical system composed of discrete system (pulley and tension arm) and continuous system (flexible multi-wedged belt). The vibration type of multi-wedged belt transmission system is very complex. It includes the rotating vibration of each pulley, the swing of tensioner, the spatial three-way vibration of the belt (longitudinal, transverse and lateral vibration) and its coupling vibration with the contact pulley, as well as the possible bending vibration and bending-torsional composite vibration of the belt, and so on. In addition, in order to avoid the resonance of the system, the natural frequency of the system is also very concerned. The research on multi-wedged belt transmission system in China started late, and is still in its early stage, especially the study of its dynamic characteristics. Therefore, for the multi-wedged belt transmission system, the author has carried out the following research work: first, taking the single multi-wedged belt transmission system as the research object, the rotating vibration model suitable for any arrangement type system is established, and the solution method of its steady state and dynamic response is given. Considering the longitudinal motion of the belt and the rotating motion of each wheel, the equation of motion is derived and the method of steady state analysis of the system is given. The equation of motion is linearized about the steady state of the system, and the dynamic equation of the system is obtained, and the solution method of the micro-amplitude vibration response of the system is given. The vibration response of an engine FEAD system is calculated. Moreover, for any type of gear train, the unified formulas of band length, package angle and other parameters are given. Secondly, taking the three-wheel-belt multi-wedged belt transmission system as the research object, the beam coupling vibration model is established. Based on this model, the transverse vibration of the band is calculated. Because the rotation model is mainly to analyze the rotating vibration in the system, the longitudinal telescopic motion of the multi-wedged belt can only be analyzed indirectly. In the actual system, the transverse vibration of multi-wedged belt has great influence on the vibration and belt life of the system. In order to predict the transverse vibration of the band, the author also studies the complex beam coupling vibration model. In the model, the belt is simplified to the longitudinal motion Bernoulli Euler beam, and the wheels and tensioners are simplified to rigid rotating elements. The steady state solution of the transverse displacement with transverse displacement is calculated by using the boundary value problem (BVP) solution technique, and the transverse vibration displacement of the band is a function of time and space, which is discretized into the product of time function and spatial function by Galerkin method, and the transverse vibration of each band is calculated. The transverse vibration of the belt and the rotating vibration of the wheel in a three-wheel-belt transmission system are tested. By comparing the calculated results with the measured results, the feasibility of the method for calculating the transverse vibration of the belt is verified.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH132.32
本文编号：2503775
[Abstract]:Since 1970, single multi-wedged belt drive system has been widely used in automobile engine front-end attachment drive (Front End Accessory Drive,FEAD) system. Multi-wedged belt transmission system is a hybrid dynamic mechanical system composed of discrete system (pulley and tension arm) and continuous system (flexible multi-wedged belt). The vibration type of multi-wedged belt transmission system is very complex. It includes the rotating vibration of each pulley, the swing of tensioner, the spatial three-way vibration of the belt (longitudinal, transverse and lateral vibration) and its coupling vibration with the contact pulley, as well as the possible bending vibration and bending-torsional composite vibration of the belt, and so on. In addition, in order to avoid the resonance of the system, the natural frequency of the system is also very concerned. The research on multi-wedged belt transmission system in China started late, and is still in its early stage, especially the study of its dynamic characteristics. Therefore, for the multi-wedged belt transmission system, the author has carried out the following research work: first, taking the single multi-wedged belt transmission system as the research object, the rotating vibration model suitable for any arrangement type system is established, and the solution method of its steady state and dynamic response is given. Considering the longitudinal motion of the belt and the rotating motion of each wheel, the equation of motion is derived and the method of steady state analysis of the system is given. The equation of motion is linearized about the steady state of the system, and the dynamic equation of the system is obtained, and the solution method of the micro-amplitude vibration response of the system is given. The vibration response of an engine FEAD system is calculated. Moreover, for any type of gear train, the unified formulas of band length, package angle and other parameters are given. Secondly, taking the three-wheel-belt multi-wedged belt transmission system as the research object, the beam coupling vibration model is established. Based on this model, the transverse vibration of the band is calculated. Because the rotation model is mainly to analyze the rotating vibration in the system, the longitudinal telescopic motion of the multi-wedged belt can only be analyzed indirectly. In the actual system, the transverse vibration of multi-wedged belt has great influence on the vibration and belt life of the system. In order to predict the transverse vibration of the band, the author also studies the complex beam coupling vibration model. In the model, the belt is simplified to the longitudinal motion Bernoulli Euler beam, and the wheels and tensioners are simplified to rigid rotating elements. The steady state solution of the transverse displacement with transverse displacement is calculated by using the boundary value problem (BVP) solution technique, and the transverse vibration displacement of the band is a function of time and space, which is discretized into the product of time function and spatial function by Galerkin method, and the transverse vibration of each band is calculated. The transverse vibration of the belt and the rotating vibration of the wheel in a three-wheel-belt transmission system are tested. By comparing the calculated results with the measured results, the feasibility of the method for calculating the transverse vibration of the belt is verified.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH132.32
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