【作者】 蒲海丰；

【导师】 李南；

【作者基本信息】 兰州理工大学 ， 机械制造及其自动化， 2008， 硕士

【摘要】 曲柄连杆机构是往复活塞式压缩机的关键机构,压缩机的振动、噪声大部分来源于曲柄连杆机构,因此对其进行优化设计是提高压缩机性能的有效途径。长期以来由于往复式压缩机曲柄连杆机构的工况比较特殊,传统的设计方法只能采用一些近似假设和简化手段进行设计,因而所得的结果不够准确。随着计算机的广泛应用,出现了一些功能强大的通用有限元分析软件,利用这些软件使得精确的分析曲柄连杆机构的特性、进而优化设计成为了可能。本文从热力学和动力学角度研究了D—100/8—C型压缩机和曲柄连杆机构的工作原理,利用三维建模Pro/Engineer软件,建立压缩机曲柄连杆机构的三维实体模型,利用机械系统动力学仿真分析软件ADAMS,对压缩机的曲柄连杆机构进行仿真;通过对该压缩机曲柄连杆机构进行运动学和动力学分析,得出活塞的位移、速度、加速度及各个运动副处作用力曲线图等,从而确定了曲轴的危险工况;利用ANSYS有限元分析软件对曲轴、连杆、活塞进行了动态特性分析,得出曲轴、连杆、活塞在两种不同情况下的模态振型;通过对于运动副处力的分析,为连杆、十字头、活塞等其他零部件的优化设计和强度校核提供了依据,并为进一步分析和研究该型压缩机的特性提供了参考。对曲轴在危险工况下的静强度、疲劳强度、应力场分布及变形状况进行了分析,计算了静强度和疲劳强度安全系数。计算结果表明,曲轴的静强度和疲劳强度安全系数都大于许用值,曲轴的强度虽然能够完全满足设计和运行工况的要求,但是安全系数偏大,尝试将曲轴曲柄销直径,曲轴主轴径缩小20mm,进行分析,结果表明减小直径的曲轴,可以满足使用要求。更多还原

【Abstract】 crank and linkage mechanism is the key parts of Reciprocating piston compressor. the vibration and noise of the compressor mianly come from the crank and linkage mechanism,so it is a effective way for improving the performances of the compressors by optimizing crank and linkage mechanism.For a long time,the traditional design methods can only adopt similar assumptions and simplified design methods,because the working conditons of reciprocating compressor is special,which lead to the results is inaccurate.With the extensive application of computers,there have been some powerful finite element analysis software,the characteristics of crank and linkage mechanism can be analyzed by inite element analysis software,which lay a foundation for further opitimizations.This thesis is mainly on the research of the thermal principles and the kinematics and dynamics of a D-100/8-C type compression engine’s crank shaft connecting rod mechanism,making use of 3-D to build the model Pro/Engineer software,the 3-D entity model of a compression engine was built,using the machinery system simulates analysing software ADAMS,the crank shaft connecting rod mechanism was simulated. According to the ananlysis for kinematics and dynamics of the compression engine’s crank shaft connecting rod mechanism,the piston displacement,speed,acceleration and moving the subsidiary place acting force curve diagram was gained,and the dangerous working condition of the crank shaft was got,too.Using of the ANSYS FEM method,made an analysis for the dynamic character of crank shaft,connecting rod and piston,and the modal vibration style in two kinds different condition was gained;By the analysis to motion subsidiary place force,for connecting rod, crosshead,piston etc.component and other part optimization designs,the intensity core of school has provided a basis and,has been that the characteristic property further.The intensity,fatigue strength,strain field distribution and deformation situation were carried out analysis on the crank shaft diversity location quietness under dangerous working condition,assurance coefficient having calculated the quiet intensity and fatigue strength calculation bear fruit indicates value,crank shaft quiet intensity and fatigue strength assurance.The caculated result indicated that the safe coefficient of crank shaft’ intensity and weary strenghwere bigger than the allowed values,although the crank shaft intensity was able to satisfy the request designing and running working condition’s completely,but the safe coefficient is prejudiced Attemptting to sell a diameter with crank shaft crank,the crank shaft chief axis footpath reduces 20 mms,made an analysis,in the end,the result indicated that the crank shaft diminishing a diameter,could satisfy the usage request.更多还原