| ZERO MODE NATURAL FREQUENCY AND NONLINEAR VIBRATION OF COUPLED LATERAL AND TORSION OF A LARGE TURBINE GENERATOR |
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| 引用本文： | Ta Na State Key Laboratory of Vibration,Shock and Noise,Shanghai Jiaotong Univernty,Shanghai 200030,Chana Qiu Jiajun Cai Ganhua School of Mechanical Engineering,Tianjin University,Tianjin 300072,China. ZERO MODE NATURAL FREQUENCY AND NONLINEAR VIBRATION OF COUPLED LATERAL AND TORSION OF A LARGE TURBINE GENERATOR[J]. 机械工程学报(英文版), 2005, 18(2): 302-306 |
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| 作者姓名： | Ta Na State Key Laboratory of Vibration Shock and Noise Shanghai Jiaotong Univernty Shanghai 200030 Chana Qiu Jiajun Cai Ganhua School of Mechanical Engineering Tianjin University Tianjin 300072 China |
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| 作者单位： | Ta Na State Key Laboratory of Vibration，Shock and Noise，Shanghai Jiaotong Univernty，Shanghai 200030，Chana Qiu Jiajun Cai Ganhua School of Mechanical Engineering，Tianjin University，Tianjin 300072，China |
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| 基金项目： | This project is supported by National Natural Science Foundation of China (No.50375049). |
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| 摘 要： | Zero mode natural frequency (ZMNF) is found during experiments. The ZMNF and vibrations resulted by it are studied. First, calculating method of the ZMNF excited by electromagnetic in vibrational system of coupled mechanics and electrics are given from the view of magnetic energy. Laws that the ZMNF vanes with active power and exciting current are obtained and are verified by experiments. Then, coupled lateral and torsional vibration of rotor shaft system is studied by considering rest eccentricity, rotating eccentricity and swing eccentricity. Using Largrange-Maxwell equation when three phases are asymmetric derives differential equation of the coupled vibration. With energy method of nonlinear vibration, amplitude-frequency characteristics of resonance are studied when rotating speed of rotor equals to ZMNF. The results show that ZMNF will occur in turbine gen erators by the action of electromagnetic Because ZMNF varies with electromagnetic parameters, resonance can occur when exciting frequency of the
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| 关 键 词： | 零模式自然序列 耦合变化 离心率 ZMNF 旋转轴 液力涡轮发电机 |
ZERO MODE NATURAL FREQUENCY AND NONLINEAR VIBRATION OF COUPLED LATERAL AND TORSION OF A LARGE TURBINE GENERATOR |
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| TaNa QiuJiajun CaiGanhua. ZERO MODE NATURAL FREQUENCY AND NONLINEAR VIBRATION OF COUPLED LATERAL AND TORSION OF A LARGE TURBINE GENERATOR[J]. Chinese Journal of Mechanical Engineering, 2005, 18(2): 302-306 |
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| Authors: | TaNa QiuJiajun CaiGanhua |
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| Affiliation: | [1]StateKeyLaboratoryofVibration,ShockandNoise,ShanghaiJiaotongUnivemty,Shanghai200030,Chana [2]SchoolofMechanicalEngineering,TianjinUniversity,Tianjin300072,China |
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| Abstract: | Zero mode natural frequency (ZMNF) is found during experiments. The ZMNF and vibrations resulted by it are studied. First, calculating method of the ZMNF excited by electromagnetic in vibrational system of coupled mechanics and electrics are given from the view of magnetic energy. Laws that the ZMNF vanes with active power and exciting current are obtained and are verified by experiments. Then, coupled lateral and torsional vibration of rotor shaft system is studied by considering rest eccentricity, rotating eccentricity and swing eccentricity. Using Largrange-Maxwell equation when three phases are asymmetric derives differential equation of the coupled vibration. With energy method of nonlinear vibration, amplitude-frequency characteristics of resonance are studied when rotating speed of rotor equals to ZMNF. The results show that ZMNF will occur in turbine gen erators by the action of electromagnetic Because ZMNF varies with electromagnetic parameters, resonance can occur when exciting frequency of the rotor speed is fixed whereas exciting current change. And also find that a generator is in the state of large amplitude in rated exciting current. |
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| Keywords: | Zero mode natural frequency Coupled vibration of lateral and torsion Eccentricity Rotor shaft Hydro turbine generator |
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