【作者】 卞安传；

【导师】 房振勇；

【作者基本信息】 哈尔滨工业大学 ， 机械制造及其自动化， 2011， 硕士

【摘要】 固定结合面作为机械系统中一种固有的结构形式,由于它在外加载荷的作用下表现出既有弹性又有阻尼的复杂动力学特性,对机械系统整体的动态性能产生显著的影响。随着工业化水平的不断提高,各行业对机械设备动态特性的要求越来越严格,所以对固定结合面的特性进行相关分析并研究其对机械系统动态特性的影响具有十分重要的意义。本文首先对机械固定结合面之间的相互作用做了相关阐述,从理论方面对影响固定结合面特性的因素进行了分析,利用模态试验与有限元分析相结合的方法对螺栓连接面的接触刚度和接触阻尼进行了识别,并通过改变结合面的正压力、接触面积以及结合面材料试验对比分析了各因素对结合面参数的影响规律。在确定结合面单位面积参数的基础上,本文利用吉村允孝法对转台几个主要结合面的接触刚度和阻尼进行了估算。利用法向和切向弹簧阻尼单元对转台几个主要固定结合面进行了等效处理,利用SolidWorks与Ansys对转台进行了动态特性的有限元仿真计算,获得了考虑结合面影响情况下转台的各阶固有频率和振型,并与固结结合面所得的固有频率进行了对比分析,评估了结合面对转台动态特性的影响程度。本文最后利用动态信号分析仪(Agilent 35670A)对转台的俯仰轴系和转台的整体分别进行了模态试验,获得了相应的频率响应特性曲线,对考虑结合面影响情况下有限元分析结果进行了验证,并与有限元模态仿真分析的结果进行了对比分析,这对提高机械结构动态特性仿真分析的精度具有参考意义。更多还原

【Abstract】 Mechanieal joints are natural strueture of all Mechanieal System. When be loaded with force, it be have complex dynamical charaeteristic with damping and elasticity and affect so much dynamical charaeteristic of Meehanieal System. With the level of industrialization increasing, the dynamics of machinery and equipment was required to be more stringent. Therefore, the fixed combination of surface characteristics and to study its correlation dynamics of mechanical systems is of great significance.In this paper, the interaction of the interface was described from the microscopic view. the factors affecting the contact surfaces’parameters were analyzed, The method of modal testing combining with the finite element analysis was used to idenfified the parameters of the contact surface. And by changing positive pressure, contact area and contact surface materials, the variation of parameters was studied by the experiment. In determining the parameters of joint surface on the basis of unit area, the method of Yoshimura was used to estimate the parameters of the mechanieal joints. In the premise that all parts of the turntable were simplified, the main fixed contact were equivalent to normal and tangential spring damper elements, the finite element simulation of dynamic characteristics for the turntable was done with SolidWorks and Ansys.the dynamic characteristics that considering the affects of the contact surface was obtained by finite element simulation, and it was compared with the results Ideally.Finally,the pitch of the rotary shaft and the turntable’s overall modal test were carried out by Agilent 35670A to obtain the corresponding frequency response curve, consider the case of the contact surface of the finite element analysis results were verified, and then they were compared with the results in the case of ignoring all contact surfaces. It will be have reference value to improve the precision of simulation for the dynamic characteristics of mechanical structure.更多还原