摘要
针对涡旋式压缩机转子的偏心构成及高速特性,通过等效配置有限应变梁单元、二维轴承单元及三维空间质量单元等,开发基于参数化的主轴部件有限元建模程序。考虑陀螺效应,在转子动力学分析基础上获取主轴系统的Campbell图及临界转速。以配重质量(m_(1)、m_(2))及其质心位置(R_(1)、R_(2))为变量对转子组件进行动态优化,不仅将其1阶临界转速提高了4.2%,而且使配重总质量与最大应力幅分别减小了0.413 kg和0.21 MPa,达到轻量化设计预期。利用nCode DesignLife构建S-N应力疲劳分析项目仿真流程,实现了多工况时序载荷映射下的曲轴疲劳分析与损伤评估。结果显示:轻量化设计在提高曲轴最低疲劳寿命的同时,明显减小了曲柄端的损伤程度及疲劳危险区,有利于提升曲轴的疲劳寿命与抗破坏能力。
According to the eccentric structure and high-speed characteristics of scroll compressor rotor,a parametric finite element modeling program for spindle components was developed by equivalent configuration of the elements like finite strain beam,2D bearing and 3D space mass etc.The Campbell diagram and critical speed of the spindle were obtained by running the rotor dynamics analysis under the influence of gyro effect.On the basis of the variables that consisted of the counterweight mass(m_1,m_2) and its centroid position(R_1,R_2),the dynamic optimization of the rotor assembly was conducted,not only its first-order critical speed was increased by 4.2%,but also the total weight of the counterweight and the maximum stress amplitude were reduced by 0.413 kg and 0.21 MPa,respectively,reaching the expectation of the lightweight design.The simulation flow of fatigue analysis project in S-N stress form was constructed by using nCode DesignLife software,and the crankshaft fatigue analysis and damage assessment were realized under time series load mapping with multiple working conditions.The results show that the lightweight design can improve the minimum fatigue life of the crankshaft,significantly reduce the extent of damage and fatigue risk area near the crank end,and is conducive to improving the fatigue life and anti-damage ability of the crankshaft.
作者
韩斌斌
袁岩兴
邱海飞
HAN Binbin;YUAN Yanxing;QIU Haifei(Beijing Institute of Radio Metrology and Measurement,Beijing 100039,China;School of Mechanical Engineering,Xijing University,Xi′an Shaanxi 710123,China)
出处
《机床与液压》
北大核心
2024年第19期53-58,共6页
Machine Tool & Hydraulics
关键词
涡旋压缩机
疲劳寿命
轻量化
临界转速
损伤
应力
scroll compressor
fatigue life
lightweight
critical speed
damage
stress
