【作者】 郭斌；

【导师】 李宏坤； 郭久梅；

【作者基本信息】 大连理工大学 ， 机械工程（专业学位）， 2018， 硕士

【摘要】 本文以煤化工装置用10万等级大型空分压缩机组为研究对象,针对该空分机组存在的能耗高、效率低等问题,围绕转子系统零部件优化设计、转子系统力学模型、转子系统不平衡响应分析、转子系统稳定性分析方法、整机扭振分析五部分内容展开研究。采用SolidWorks软件创建叶轮实体模型,取其扇区模型作为分析对象,导入有限元分析软件ANSYS进行应力分析和模态分析,依据分析结果以及定子件结构来制定叶轮去重方案以及叶轮叶片数目的确定。针对优化后的转子系统分别建立三种结构模型,包括实际螺栓联接结构、日本三井的简化结构、不考虑螺栓的一体化结构。分别以其法兰盘螺栓联接位置为中心,向两侧各取出一定长度的轴段作为研究对象,在ANSYS Workbench软件中,采用一端固定,另一端施加弯矩的方法,获取受弯矩影响下的挠度变化趋势。与此同时,沿着最大受弯面来定义路径,根据路径绘制挠度对比图,以此来间接衡量三种结构的弯曲刚度,为后续的转子动力特性评估提供理论依据。采用RBSP2012软件建立转子系统动力学模型,通过程序默认的激励施加方式来对转子系统进行不平衡响应分析,并对多个不同方案的不平衡响应分析结果进行对比研究。依据API617中的轴流压缩机交叉刚度计算公式,调整对应的参数,输入到RBSP2012软件中,完成转子系统Ⅰ级稳定性分析,并将Ⅰ级稳定性分析中所计算得到的轴流段8级叶片组的预期交叉耦合刚度,作为假设的密封交叉刚度参数输入到RBSP2012软件中,用来计算转子系统Ⅱ级稳定性。采用RBSP2012软件建立整机轴系扭转动力学模型,进行扭振分析。更多还原

【Abstract】 In this paper,the one hundred thousand grades large air separation compressor unit used in coal chemical industry is studied,for the reasons of high energy consumption and low efficiency,the unit is studied centering on the following five parts: optimization design of rotor system components,study on mechanical model of rotor system,Unbalance response analysis of rotor system,research on stability analysis method of rotor system,torsional vibration analysis of the whole machine.Using SolidWorks software to create a solid model of impeller,take the sector model as the object of analysis,and import it into ANSYS software for stress analysis and modal analysis.Then according to the analysis results and stator parts,we can formulate the optimization scheme for impeller weight removal and determine the number of impeller blades.Three structural models are established for the optimized rotor system,including the actual bolt connection structure,the Mitsui simplified structure and the integrated structure without considering the bolt,taking the position of the flange bolt connection as the center,and the axis of a certain length in both sides taken as the research object.In the Workbench ANSYS software,one end is fixed and the other end is applied to the bending moment in order to obtain the deflection change trend under the influence of the bending moment.The path is defined along the maximum curved surface and the deflection contrast diagram is drawn according to the path in order to indirectly measure the bending stiffness of the three kinds of structure provide a theoretical basis for the follow-up of the dynamic characteristics of the rotor.Establish the dynamic model of rotor system by RBSP2012 software,carry out the unbalanced response analysis of the rotor system through the default excitation application of the program and compare the results of the unbalanced response analysis of several different schemes.According to the calculation formulas of axial compressor cross stiffness based on API617,adjust the corresponding parameters in the calculation formulas,input parameters to the RBSP2012 software and complete the grade I stability analysis of the rotor system.Expected cross coupling stiffness of 8 stage blades in axial flow which is obtain from the grade Instability analysis are taken as hypothetical seal cross stiffness parameters,which are input to the RBSP2012 software for computing the grade II stability of the rotor system.Using RBSP2012 to establish the dynamic model of the whole system and carry out the torsional vibration analysis.更多还原