轴承声振耦合算法与波纹度振动声学特征仿真研究

发布时间：2018-03-15 04:32

本文选题：滚动轴承　切入点：动力学　出处：《重庆大学》2012年硕士论文　论文类型：学位论文

【摘要】：滚动轴承是一种重要的基础机械部件，在现代机器中广泛应用，轴承的运行状态对整个机械系统的动力学性能起到非常重要的作用,轴承的振动不仅直接影响主机的精度，而且影响转子系统的运行状态，同时发出的噪声还将污染周围环境，随着传动系统向高可靠性和高速静音方向发展，对轴承系统的振动和噪声提出了愈来愈高的要求。虽然现代加工工艺和加工精度得到了明显改善和提高，但波纹度作为轴承分布式加工缺陷，仍然是激励滚动轴承振动噪声的主要因素之一。针对这个问题，本文提出了一种新的轴承声振耦合算法，可应用于轴承-轴承座系统振动声学特征的预测，具有计算效率高的优点；基于提出的新的轴承声振耦合算法，分析研究了轴承内、外圈波纹度参数变化对轴承-轴承座系统振动声学特性的影响，获得了一些有价值的结论。论文的主要研究内容如下： ①基于Hertz接触理论和轴承运动学的关系，推导了滚动轴承承载区的非线性接触力计算公式，并基于将轴承座内表面考虑为一微质量的刚性介质层且存在刚性振动的假设，建立了六自由度滚动轴承动力学模型，为进一步进行轴承的动力学分析奠定了基础； ②提出了轴承座内表面位移映射法，运用六自由度滚动轴承动力学模型，求解获得轴承系统各部件振动位移；通过轴承座内表面位移映射法，实现了轴承动力学模型的位移输出和轴承座有限元模型的位移激励输入的耦合，简化了耦合计算，提高了计算效率； ③建立轴承-轴承座系统的有限元分析模型，研究了正常轴承激励下的轴承座振动响应；建立了轴承座声学边界元分析模型，以轴承座结构表面振动响应为边界条件，研究了正常轴承激励下的轴承座表面声学量及辐射场点噪声，，并通过轴承振动和噪声实验验证了本文提出的声振耦合算法； ④运用本文提出的轴承声振耦合新算法，针对内、外圈波纹度对轴承系统振动声学特性影响的问题，研究了波纹度参数-波纹度最大幅值和波数变化对轴承-轴承座系统的振动响应和声学特征的影响，为轴承的设计和制造研究提供了理论依据。本文提出的轴承声振耦合算法可用于预测轴承-轴承座系统振动声学特征，计算快速、简便，效率高，分析获得的轴承内、外圈波纹度参数变化对轴承-轴承座系统振动声学特征影响的结果，为轴承的设计和制造研究提供了理论依据，具有一定的学术意义和重要的工程应用价值。
[Abstract]:Rolling bearing is an important basic mechanical component, which is widely used in modern machine. The running state of bearing plays a very important role in the dynamic performance of the whole mechanical system. The vibration of the bearing not only directly affects the accuracy of the main engine, Moreover, the operating state of the rotor system is affected and the noise emitted will pollute the surrounding environment. With the development of the transmission system towards high reliability and high speed silence, the vibration and noise of the bearing system are demanded more and more. Although modern machining technology and machining precision have been improved obviously, corrugation, as a distributed machining defect of bearings, is still one of the main factors to stimulate the vibration and noise of rolling bearings. In this paper, a new acoustic-vibration coupling algorithm for bearing is proposed, which can be used to predict the acoustic characteristics of bearing bearing bearing seat system, and has the advantage of high calculation efficiency. The influence of the corrugation parameters of outer ring on the vibration acoustics of bearing-bearing bearing seat system is studied. Some valuable conclusions are obtained. The main contents of this paper are as follows:. Based on the relation between Hertz contact theory and bearing kinematics, the nonlinear contact force calculation formula of bearing bearing is derived, and the assumption that the inner surface of bearing seat is considered as a rigid medium layer with small mass and rigid vibration is assumed. The dynamic model of six degrees of freedom rolling bearings is established, which lays a foundation for further dynamic analysis of bearings. (2) the displacement mapping method of the inner surface of the bearing seat is put forward, and the vibration displacement of each component of the bearing system is obtained by using the dynamic model of the rolling bearing with six degrees of freedom, and the displacement mapping method of the inner surface of the bearing seat is used. The coupling of the displacement output of the bearing dynamic model and the displacement excitation input of the finite element model of the bearing seat is realized, which simplifies the coupling calculation and improves the calculation efficiency. (3) the finite element analysis model of bearing-bearing bearing system is established, the vibration response of bearing under normal excitation is studied, the acoustic boundary element analysis model of bearing seat is established, and the vibration response of bearing structure is taken as boundary condition. The acoustics and radiation field noise on the bearing seat surface under normal bearing excitation are studied, and the acousto-vibration coupling algorithm proposed in this paper is verified by the bearing vibration and noise experiments. 4 using the new acoustic-vibration coupling algorithm proposed in this paper, aiming at the influence of corrugation of inner and outer rings on the vibration acoustic characteristics of bearing system, The effects of the maximum corrugation parameter and wavenumber on the vibration response and acoustic characteristics of bearing-bearing bearing bearing system are studied, which provides a theoretical basis for the design and manufacture of bearings. The acousto-vibration coupling algorithm proposed in this paper can be used to predict the vibration acoustic characteristics of bearing-bearing bearing bearing seat system. The calculation is fast, simple and efficient. The effect of the corrugation parameters of outer ring on the vibration acoustic characteristics of bearing-bearing bearing bearing seat system provides a theoretical basis for the research of bearing design and manufacture, and has certain academic significance and important engineering application value.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.33

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