摘要
涡旋压缩机驱动轴承与曲柄轴之间接触副刚度的周期性变化及运动副间隙的存在,是引起压缩机传动系统产生振动的主要激励源。深入分析接触副啮合刚度及间隙对研究涡旋压缩机振动特性具有重要意义。根据Hertz线接触问题的弹性变形理论建立单滚子刚度模型,采用能量法求解得到滚针轴承动态刚度模型。将得到的刚度模型代入ADAMS虚拟样机对模型进行运动及动力学仿真,仿真分析得到间隙和变刚度下系统动力学响应。研究结果表明:时变刚度激励及间隙激励使得接触副接触碰撞力幅值增大,0.003 mm间隙下变刚度碰撞力为定刚度的1.16倍,驱动轴承位移产生波动,且变刚度激励下主轴承振动加速度为定刚度的1.45倍,影响压缩机转子系统的运转稳定性。
The periodic change of the contact stiffness between the drive bearing and the crank shaft and the existence of the clearance of the moving pair are the main excitation sources that cause the vibration of the compressor drive system.It is of great significance to deeply analyze the meshing stiffness and clearance of contact pair for the study of vibration characteristics of scroll compressor.The single roller stiffness model was established according to the elastic deformation theory of Hertz line contact problem,and the dynamic stiffness model of needle roller bearing was obtained by energy method.The obtained stiffness model was substituted into ADAMS virtual prototype to simulate the motion and dynamics of the model,and the dynamic response of the system under clearance and variable stiffness was obtained.The results show that the amplitude of contact impact force of the contact pair increases with the time-varying stiffness excitation and clearance excitation.The impact force of the variable stiffness is 1.16 times of the constant stiffness at the clearance of 0.003 mm,and the displacement of the driving bearing fluctuates.The vibration acceleration of the main bearing under the variable stiffness excitation is 1.45 times of the constant stiffness,which affects the operation stability of the compressor rotor system.
作者
刘涛
柴正阳
麻德权
LIU Tao;CHAI Zheng-yang;MA De-quan(School of Mechanical and Electrical Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《压缩机技术》
2023年第5期24-30,共7页
Compressor Technology
基金
国家自然科学基金项目(52265034)。
关键词
时变刚度
间隙激励
能量法
虚拟样机
time-varying stiffness
clearance excitation
energy method
virtual prototype
