高速双透平与四磁盘同轴结构轴系振动特性试验研究  

Experimental Research on Vibration Characteristics of High-speed Rotor Bearings System with Dual-turbo-four Disc Structure

作　　者：卞双[1] 王正威[1] 杨金福[2] 于明涛[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206 [2]中国科学院工程热物理研究所,北京100190

出　　处：《润滑与密封》2016年第6期35-40,共6页Lubrication Engineering

基　　金：国家科技支撑计划项目(2012BAA11B02)

摘　　要：在动静压混合气体润滑轴承支承的双透平与四磁盘同轴结构的涡轮膨胀发电机试验台上,研究气体轴承-转子系统动力学特性。通过轴心轨迹、频率耦合三维图和频谱图,分析系统非线性行为特征,结合转子系统的结构对飞升现象进行分析。结果表明:该轴承-转子系统由于采用气浮轴承,在一定供气压力下,出现半速涡动、气膜振荡的典型振荡现象,并在某一转速时出现飞升现象。出现飞升的原因是由于设备结构中采用了阻尼低的气体轴承以及两端涡轮结构,使其在工频、分频能量转化时转换成了转子转速,导致转子转速的急剧增加。通过调节振动特性和控制涡轮供气流量等措施可抑制飞升。The dynamic characteristics of gas lubrication bearings system was studied on the dual.turbo expander gener.ator test bed with the four.disk and a radial turbine rotor structure supported by hydrostatic.dynamic hybrid gas lubricationbearings.Based on shaft center orbits,frequency coupling 3-D plot and frequency spectrum,the nonlinear characteristics ofrotor bearing system were analyzed.The reason of a sharp increase in rotor speed was analyzed combined with the structureof the rotor system.The experimental results prove that,because of the application of gas.bearings supporting structure inthe bearing.rotor system,gas film half-speed whirl and gas whip appear under the certain bearing supply pressure,and thespeed.rise appear under the certain speed.Due to low damping and rotor structure,a sharp increase in rotor speed appears when the energy of power frequency and fractional frequency transform into rotor speed.The measures such as adjusting thevibration characteristics and controlling the flow of gas turbines can suppress the speed.rise.

关 键 词：气体润滑轴承 涡轮膨胀发电机 非线性振动 飞升 

分 类 号：TH117.2[机械工程—机械设计及理论] TK14[动力工程及工程热物理—热能工程]