裂纹故障对盘式拉杆组合转子系统应力重组的影响研究  

Influence of crack fault on stress recombination of disk rod-fastening rotor system

作　　者：王南山[1,2] 李源 刘恒[2] 刘意[2] WANG Nanshan;LI Yuan;LIU Heng;LIU Yi(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;School of Mechanical Engineering,Xi an Jiaotong University,Xi an 710049,China;Dongfang Electric Wind Power Co.,Ltd.,Deyang 618000,China)

机构地区：[1]太原科技大学机械工程学院,山西太原030024 [2]西安交通大学机械工程学院,陕西西安710049 [3]东方电气风电股份有限公司,四川德阳618000

出　　处：《机电工程》2023年第12期1991-2000,共10页Journal of Mechanical & Electrical Engineering

基　　金：国家自然科学基金面上项目(51475357);山西省基础研究计划面上项目(202303021211168);山西省高等学校科技创新计划项目(2022L293);山西省优秀博士来晋工作奖励资金科研项目(2022140);太原科技大学科研启动基金资助项目(2022034)。

摘　　要：在含裂纹一般整体转子研究中,难以有效反映裂纹尖端奇异效应及其三维形态特征,同时一维方法难以反映复杂组合转子系统的裂纹故障应力影响范围、系统应力重组情况及对系统整体初始形态的影响。针对上述一些问题,以典型三盘拉杆组合转子系统为例,研究了三维裂纹故障对复杂拉杆组合转子系统应力重组及整体弯曲形态的影响,并进行了实验验证。首先,基于三维有限元方法,采用三维等参奇异裂纹有限元建模技术和三维有限软件,建立了三维裂纹子模型及系统有限元模型;然后,采用有限元仿真技术,分析了裂纹及其深度变化对此类组合转子系统的应力分布重组及整体弯曲特性的影响;最后,采用实验方法,验证了裂纹对此类系统整体初始弯曲特性的影响情况。研究结果表明:盘式拉杆组合转子系统裂纹故障的产生会使得裂纹位置区域局部柔性增强,系统的主要界面及系统应力分布发生变化且重组,系统应力分配不均匀,且呈现不对称性,转子整体弯曲形态发生变化;在裂纹深度较浅(0.5 mm)时,裂纹诱发的转子附加弯曲效应并不明显;随着裂纹深度的增加,系统应力分布重组和附加弯曲越趋于严峻,当裂纹深度较深(1.5 mm或2.5 mm)时,裂纹诱发的转子附加弯曲效应较为突出。该研究对此类复杂组合转子系统的静动力学特性的精确分析和裂纹引发的异常振动原因的探究具有一定的指导意义。Aiming at the problems of the difficulty in effectively reflecting the singular effect of crack tip and its three-dimensional(3D)morphological characteristics in the study of general integrated rotors with cracks,as well as the difficulty in reflecting the stress influence range of crack faults,system stress recombination,and the impact on the overall initial morphology of combined rotor systems(CRS)with one-dimensional method,a typical three-disc rod-fastening rotor system(RRS)was taken as an example and the influence of 3D crack fault on stress recombination and system bending morphology of RRS was investigated and verified by experiments.Firstly,based on the 3D finite element method,3D isoparametric singular crack modeling technology was used to establish a 3D crack submodel and a system finite element model with 3D software.Then,the influence of crack and its depth on the stress distribution recombination and the overall bending characteristics of this type of CRS was simulated and analyzed with finite element method.Finally,the influence of cracks on the overall initial bending characteristics of such systems was verified through experiments.The experimental results show that the crack fault of the disk RRS strengthens the local flexibility of the crack location region,the main contact interfaces and the system stress distribution change and recombine,the system stress distribution is uneven and asymmetrical,and the overall bending shape of the rotor changes.When the crack depth is shallow(0.5 mm),the additional bending effect of the rotor induced by the crack is not obvious.With the increase of crack depth,the stress distribution recombination and additional bending become severe.When the crack depth is deeper(1.5 mm or 2.5 mm),the additional bending effect induced by the crack is more prominent.This research has a certain guiding significance for the accurate analysis of the static and dynamic behaviors of the CMS and the abnormal vibration caused by cracks.

关 键 词：拉杆组合转子系统 应力分布重组分析 三维裂纹故障 整体弯曲特性 三维有限元 接触界面应力 

分 类 号：TH133[机械工程—机械制造及自动化] TH114