CAJ | 학술논문

对几种间隙流体激振力模型进行分析比较,着重描述了Muszynska模型所揭示的流体激振力的主要特征;并应用 Muszynska模型建立了水轮机Jeffcott转子-密封系统非线性动力学模型;通过数值计算分析了系统主要参数对稳定性的影响及转子涡动幅值随转速变化的规律.结果表明当转速超过临界失稳转速时,系统出现小幅度涡动,随着转速的进一步提高,转子的涡动幅值持续增加,最终可能导致碰摩,是转子产生破坏事故的重要原因之一.
대궤충간극류체격진력모형진행분석비교,착중묘술료Muszynska모형소게시적류체격진력적주요특정;병응용 Muszynska모형건립료수륜궤Jeffcott전자-밀봉계통비선성동역학모형;통과수치계산분석료계통주요삼수대은정성적영향급전자와동폭치수전속변화적규률.결과표명당전속초과림계실은전속시,계통출현소폭도와동,수착전속적진일보제고,전자적와동폭치지속증가,최종가능도치팽마,시전자산생파배사고적중요원인지일.
With comparison analysis of several models of the fluid exciting force for the clearance of the hy?draulic turbines, this paper describes the main characteristics of the fluid exciting force by the Muszynska model. The nonlinear Jeffcott model of the rotor-seal system for the clearance of the hydraulic turbines has been established. The influence of the main parameters on the stability of the system and the characteristic of whirl amplitude are studied with rotation speed of the rotor by the numerical calculation. The results state that when the rotation speed of the rotor reaches the threshold speed,the whirl amplitude of the sys?tem begins to appear. With the rapid rotation speed,the amplitude of vibration increases,and the rotor-sta?tor rubs will be happened to destroy the system. So studying on the fluid excitation of the hydraulic tur?bine rotor-seal system is important and meaningful.