齿轮耦合的压缩机转子系统动力学特性研究

发布时间：2018-01-06 10:23

本文关键词：齿轮耦合的压缩机转子系统动力学特性研究　出处：《东北大学》2011年硕士论文　论文类型：学位论文

【摘要】：在含有齿轮传动的高速转子系统中,进行转子系统的动力学分析时应该充分的考虑到齿轮的啮合作用。齿轮间的径向力、切向力会同时引起转子系统的弯曲振动及扭转振动,即而引起转子系统的弯扭耦合振动。此外,转子系统因可能包含多个齿轮啮合单元,而各单元的齿轮形式不一,且因为各传递轴转速和转向也不尽相同,使得带有齿轮啮合的转子系统的耦合振动问题变得更加复杂。本文主要研究的是含齿轮压缩机转子系统的振动特性问题,即运用转子动力学理论和有限元理论,分别研究了压缩机子转子系统、整机转子系统在不同情况下的振动特性。本文的工作主要包括以下几个方面： (1)介绍了转子系统动力学的基本理论及本文所用到ANSYS相关单元,在对现有文献整理总结的基础上,推导了直齿轮及几种斜齿轮啮合刚度矩阵的具体表达形式。 (2)建立了齿轮增速机的动力学分析模型,考虑在不同啮合刚度矩阵下系统固有特性的差别,并分析螺旋角及轮齿啮合刚度的变化对齿轮转子系统固有特性、稳定性及振动响应的影响。 (3)通过对技术图纸的简化,建立了H518齿轮压缩机整机转子系统的有限元分析模型。并分别对高压端转子系统、低压端转子系统及整机转子系统的弯曲、扭转及弯扭耦合振动分别进行分析,研究因齿轮的啮合作用导致的系统固有特性的变化。 (4)对系统进行稳定性分析,并根据API标准进行加载,进行不平衡响应分析,得到系统在不同加载方式下的振动响应情况。 (5)推导了转子系统联轴器偏角不对中及平行不对中故障的动力学模型,介绍了两种不对中故障不对中力的计算方法,对不同程度不对中故障下转子系统的振动响应进行了仿真分析。最后得出因齿轮的耦合作用,含齿轮啮合的转子系统与单轴分析相比,会产生新的频率成分,振型也会发生变化。通过共振区、稳定性及响应分析确定H518压缩机组的工作安全。具有不对中故障的转子系统的振动频谱中会出现工频和二倍频成分,不对中越严重,二倍频所占比例越大；在不对中故障状态下,转子的轴心轨迹呈现香蕉形或内外八字形。
[Abstract]:In the high speed rotor system with gear transmission , the meshing action of the gear should be fully taken into account in the dynamic analysis of the rotor system . The radial force and tangential force between gears can cause bending vibration and torsional vibration of the rotor system at the same time , that is , the torsional coupling vibration of the rotor system is caused . In addition , the rotor system can include a plurality of gear engaging units , and the gear forms of the units are different , and the coupling vibration problem of the rotor system with gear meshing becomes more complicated because the rotating speed and the steering of each transmission shaft are different . This paper mainly studies the vibration characteristics of the rotor system of the gear - containing compressor , that is , the rotor dynamics theory and the finite element theory are used to study the vibration characteristics of the rotor system of the compressor and the rotor system of the whole machine in different situations . The work of this paper mainly includes the following aspects : ( 1 ) The basic theory of the dynamics of the rotor system and the relevant unit of ANSYS are introduced . On the basis of summarizing the existing literatures , the concrete expressions of the meshing stiffness matrix of spur gears and several helical gears are derived . ( 2 ) The dynamic analysis model of gear speed increaser is established , considering the difference of the inherent characteristics of the system under different meshing stiffness matrix , and analyzing the influence of helix angle and gear meshing stiffness on the inherent characteristics , stability and vibration response of the gear rotor system . ( 3 ) Based on the simplification of the technical drawings , the finite element analysis model of the rotor system of H518 gear compressor is established . The bending , torsion and torsional coupling vibration of the high pressure end rotor system , the low pressure end rotor system and the whole machine rotor system are respectively analyzed , and the inherent characteristics of the system due to the meshing of gears are studied . ( 4 ) analyzing the stability of the system , loading the system according to the API standard , carrying out unbalance response analysis , and obtaining the vibration response of the system under different loading modes . ( 5 ) The dynamic model of the rotor system coupling deflection angle misalignment and the parallel misalignment is derived . The calculation method of the middle force is introduced , and the vibration response of the rotor system is simulated and analyzed in different degrees . It is concluded that the rotor system with gear meshing can produce new frequency component compared with single - axis analysis because of the coupling effect of gear . The working safety of H518 compressor unit can be determined by resonance region , stability and response analysis .

【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH45

【参考文献】