CAJ | 학술논문

研究了汽轮机转子在非线性间隙气流激振力作用下的动力学特性，建立了非线性气流激振力作用下汽轮机转子系统的无量纲运动方程，并采用数值仿真方法研究分析了气流激振力、质量偏心和进气速度对转子系统的分岔特性。结果表明：汽轮机非线性间隙气流激振力的存在，使得系统在亚临界转速区域出现的短暂混沌消失，系统的混沌区域在临界转速附近明显减小，且由于气流激振力的作用，部分拟周期运动在超临界转速区域演变为5倍周期运动；质量偏心和进气速度对转子系统的非线性分岔特性也有很大的影响，使得系统运动更加复杂化。
연구료기륜궤전자재비선성간극기류격진력작용하적동역학특성，건립료비선성기류격진력작용하기륜궤전자계통적무량강운동방정，병채용수치방진방법연구분석료기류격진력、질량편심화진기속도대전자계통적분차특성。결과표명：기륜궤비선성간극기류격진력적존재，사득계통재아림계전속구역출현적단잠혼돈소실，계통적혼돈구역재림계전속부근명현감소，차유우기류격진력적작용，부분의주기운동재초림계전속구역연변위5배주기운동；질량편심화진기속도대전자계통적비선성분차특성야유흔대적영향，사득계통운동경가복잡화。
T his paper makes a study of the dynamic characteristics of the rotor‐bearing system under the air‐exciting force of stream turbine and comes up with a kinetic equation to express the vibration characteristics .A numerical method is adopted to analyze the bifurcation and chaos characteristics of the rotor‐bearing system .The results of calculation show that the short‐time chaos disappears in the sub‐critical speed region due to the air‐exciting force of the steam turbine ,the chaos motion region de‐creases ,and its characteristics change greatly around the critical speed .In the supercritical speed do‐main some quasi‐period motions become five times periodic ones .Besides ,the research into the rotor mass eccentricity and the steam‐intaking speed may contribute to further understanding of the failure mechanism of such a rotor‐bearing system .