同步电机驱动压缩机组轴系扭转疲劳分析
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摘要
API617标准规定,对于同步电机驱动压缩机组,在机组起动工况下,同步电机产生的瞬时冲击扭矩非常大,轴系部件的响应扭矩可能会大于材料的疲劳极限,故必须进行起动工况下的瞬态扭转分析及轴系扭振疲劳分析,以确定机组部件可承受的电机起动次数。利用商业转子动力学软件XLROTOR对同步电机驱动机组进行了起动工况下的轴系瞬态扭振分析,获得了轴段的扭转瞬态响应。利用应变寿命法进行了低周扭转疲劳分析,获得了转轴材料的表面完全因子、形状因子、载荷因子、有效应力集中因子、安全因子等疲劳参数,最终利用累积疲劳算法获得了机组的许用起动次数。
According to API 617, for compressors driven by synchronous motor, synchronous motor would produce large transient torque, which may cause the response torque of rotor parts exceeding the material fatigue limits under startup condition. Therefore, the transient torsional analysis and the train torsional fatigue analysis must be taken out to make sure the number of startup that the equipment can bear. The commercial rotor-dynamic software XLROTOR is used to analyze the train transient torsional vibration analysis under startup condition for synchronous motor driven compressors, and transient torsional response for rotor elements is obtained. By utilizing strain-life theory for a low cycle fatigue analysis, the shaft material fatigue parameters such as surface finish factor, size factor, load factor, effective stress concentration factor and safety factor were obtained. Finally,the number of start-up was gained by cumulative fatigue algorithm.
According to API 617, for compressors driven by synchronous motor, synchronous motor would produce large transient torque, which may cause the response torque of rotor parts exceeding the material fatigue limits under startup condition. Therefore, the transient torsional analysis and the train torsional fatigue analysis must be taken out to make sure the number of startup that the equipment can bear. The commercial rotor-dynamic software XLROTOR is used to analyze the train transient torsional vibration analysis under startup condition for synchronous motor driven compressors, and transient torsional response for rotor elements is obtained. By utilizing strain-life theory for a low cycle fatigue analysis, the shaft material fatigue parameters such as surface finish factor, size factor, load factor, effective stress concentration factor and safety factor were obtained. Finally,the number of start-up was gained by cumulative fatigue algorithm.
引文
[1] API Standard 617,Seventh Edition,2002. Axial and Centrifugal Compressor and Expander-Compressor for Petroleum,Chemical and Gas Industry Services. American Petroleum Institute,Washington,D.C.
[2] API Recommended Practice 684,Second Edition,2005.Tutorial on Rotordynamics:Lateral Critical,Unbalancing Response,Stability,Train Torsional and Rotor Balancing.American Petroleum Institute,Washington,D.C.
[3] XLROTOR 3.76 Version,2009,Help on XLROTOR,Texas A&M University,2003.
[4] O. Al-Bedoor,K.A. Moustafa,K.M. Al-Hussain. Predicting the Fatigue Life of Synchronous Motor-driven Compresso r Using the Complex Modal Reduction Technique.Comput. Methods Appl. Mech. Engrg. 187(2000):53-68.
[5] Shigley,J.E.,Mischke,C.R. and Budynas,R.G.,Mechanical Engineering Design 8th Edition,McGraw-Hill,2006,pages 261-295.
[6]机械设计手册编委会.疲劳强度设计[M].北京:机械工业出版社,2007.
[7] Mark Corbo,Brian Pettinato,Malcolm Leader,Chris Kulhanek.API684-Torsional Aspects(Short Course T05). 42th Turbomachinery Symposium Proceedings,2013.
[8] Mark A Corbo,Clifford P. Cook. Torsional Vibration Analysis of Synchronous Motor-driven Turbomachinary. 29th Turbomachinery Symposium Proceedings,2000.
[9] Mark A Corbo,Clifford P. Cook,Charles W. Yeiser and Michael J Costello. Torsional Vibration Analysis and Testing of Synchronous Motor-driven Turbomachinary. 31th Turbomachinery Symposium Proceedings,2002.
[2] API Recommended Practice 684,Second Edition,2005.Tutorial on Rotordynamics:Lateral Critical,Unbalancing Response,Stability,Train Torsional and Rotor Balancing.American Petroleum Institute,Washington,D.C.
[3] XLROTOR 3.76 Version,2009,Help on XLROTOR,Texas A&M University,2003.
[4] O. Al-Bedoor,K.A. Moustafa,K.M. Al-Hussain. Predicting the Fatigue Life of Synchronous Motor-driven Compresso r Using the Complex Modal Reduction Technique.Comput. Methods Appl. Mech. Engrg. 187(2000):53-68.
[5] Shigley,J.E.,Mischke,C.R. and Budynas,R.G.,Mechanical Engineering Design 8th Edition,McGraw-Hill,2006,pages 261-295.
[6]机械设计手册编委会.疲劳强度设计[M].北京:机械工业出版社,2007.
[7] Mark Corbo,Brian Pettinato,Malcolm Leader,Chris Kulhanek.API684-Torsional Aspects(Short Course T05). 42th Turbomachinery Symposium Proceedings,2013.
[8] Mark A Corbo,Clifford P. Cook. Torsional Vibration Analysis of Synchronous Motor-driven Turbomachinary. 29th Turbomachinery Symposium Proceedings,2000.
[9] Mark A Corbo,Clifford P. Cook,Charles W. Yeiser and Michael J Costello. Torsional Vibration Analysis and Testing of Synchronous Motor-driven Turbomachinary. 31th Turbomachinery Symposium Proceedings,2002.