轴承刚度对双叶片环保泵转子动力学特性的影响分析  

Study on Influence of Bearing Stiffness on Rotor Dynamic Characteristics of Double-blade Pump

作　　者：宋冬梅 陈小明 刘雪垠 曾梦玮 林玉东 曾浪令 邓宏盛 SONG Dongmei;CHEN Xiaoming;LIU Xueyin;ZENG Mengwei;LIN Yudong;ZENG Langling;DENG Hongsheng(Sichuan Provincial Machinery Research&Design Institute Group Co.,Ltd.,Chengdu 610063,China;School of Energy and Power Engineering,Xihua University,Chengdu 610039,China)

机构地区：[1]四川省机械研究设计院(集团)有限公司,成都610063 [2]西华大学能源与动力工程学院,成都610039

出　　处：《机械工程师》2023年第10期147-149,153,共4页Mechanical Engineer

基　　金：四川省科技计划项目(2022JDZH0011)。

摘　　要：为了研究轴承刚度对双叶片环保泵转子动力学特性的影响,基于流固耦合理论,采用ANSYS-CFX和ANSYS-Workbench,对4种轴承刚度方案下的环保泵固有频率、模态振型、临界转速及谐响应进行了求解和对比分析。计算结果表明:模态振型在不同支承刚度下表现为同相振型,以水平摆动为主。当轴承刚度从2.6×10^(5) N/mm增加到2.6×10^(6) N/mm时,转子固有频率和临界转速均明显增加,而当轴承刚度从2.6×10^(6) N/mm增加到2.6×10^(8) N/mm时,固有频率和临界转速增速变缓。转子额定转速均小于4种轴承刚度下转子的前3阶临界转速,不会发生共振。谐响应振幅随支承刚度增大而降低,支承刚度为2.6×10^(5) N/mm时振幅最大,X、Y、Z方向分别为0.44、0.32、0.16 mm。不同支承刚度在X方向上最大振幅均分别为0.44、0.28、0.24、0.19 mm,降低幅度分别为36.4%、14.3%、20.83%。研究结果可为类似泵的轴承选型以及转子结构优化等提供参考。To study the influence of bearing stiffness on dynamic characteristics of double-blade pump,the natural frequency,modal shape,critical speed and harmonic response of pump under four bearing stiffness schemes are solved and compared by using ANSYS-CFX and ANSYS-Workbench,which based on the fluid-structure coupling theory.The calculation results show that the mode shapes are in the same phase under different support stiffness and are dominated by horizontal swing.The natural frequency and critical speed of the rotor increases significantly when bearing stiffness increases from 2.6×10^(5) N/mm to 2.6×10^(6) N/mm,but increases slowly when bearing stiffness increases from 2.6×10^(6) N/mm to 2.6×10^(8) N/mm.The rated speed of the rotor is less than the first 3 critical speeds of the rotor under the stiffness of the four bearings,and no resonance occurs.The harmonic response amplitude decreases with the increase of the supporting stiffness,and the amplitude is the largest when the supporting stiffness is 2.6×10^(5) N/mm,and the amplitude of X,Y,Z direction is 0.44,0.32 and 0.16 mm,respectively.The maximum amplitudes of different support stiffness in X,Y and Z directions are 0.44,0.28,0.24,0.19 mm respectively,and the decreasing amplitudes are 36.4%,14.3%and 20.83%.The research results can provide reference for bearing selection and rotor structure optimization of similar pumps.

关 键 词：双叶片环保泵 数值模拟 流固耦合 模态分析 临界转速 

分 类 号：TH311[机械工程—机械制造及自动化]