机电扰动下大型汽轮发电机组轴系扭振分析-热能工程专业论文.docxVIP

华北电力大学硕士学位论文摘 华北电力大学硕士学位论文 摘 要 为了更好地监测大型汽轮发电机组扭振，对机电扰动故障机理的分析显得至 关重要。本文在多段集中质量模型的基础上，考虑了阻尼、叶片等轴系附加结 构对轴系扭振的影响，并将其模化为附加转动惯量，使轴系扭振模型更接近机 组实际情况。同时，本文以伊敏电厂500MW机组为实例，进行了现场扭振试验， 并编制了相应软件，对轴系扭振故障进行了固有频率计算、危险截面判定，以 及响应分析，为大型汽轮发电机组轴系扭振的在线监测与寿命保护奠定了基础。 关键词：机电扰动，轴系扭振，阻尼，仿真 ABSTRACT To optimize monitoring for torsional vibration of turbo—generator，it is very important to analysis the mechanism of the electromechannical Disturbance．In base of the multi·concentrated mass model，the influence of the damp and blade and other additional structure iS considered，and which iS transformed to additional inertia，it makes the torsional vibration model of the shaft more close to the fact． Meanwhile，there is an actual example about Yimin 500MW unit in this paper，and torsional experiment is taken in locale，relevant procedure is compiled，nature frequencies calculation，determinant of dangerous section，and response analysis is carried out，it is well for the online monitoring and life protection on torsional vibration of the turbo—generator． ’Hu Ke(Thermal power engineering) Directed by prof．Gu Yujiong KEY WORDS：electromechannical disturbance，torsional vibration of shafts， damp，simulation 华北电力大学硕士学位论文摘 华北电力大学硕士学位论文 摘 要 为了更好地监测大型汽轮发电机组扭振，对机电扰动故障机理的分析显得至 关重要。本文在多段集中质量模型的基础上，考虑了阻尼、叶片等轴系附加结 构对轴系扭振的影响，并将其模化为附加转动惯量，使轴系扭振模型更接近机 组实际情况。同时，本文以伊敏电厂500MW机组为实例，进行了现场扭振试验， 并编制了相应软件，对轴系扭振故障进行了固有频率计算、危险截面判定，以 及响应分析，为大型汽轮发电机组轴系扭振的在线监测与寿命保护奠定了基础。 关键词：机电扰动，轴系扭振，阻尼，仿真 ABSTRACT ．To optimize monitoring for torsional vibration of turbo—generator，it is very important to analysis the mechanism of the electromechannical Disturbance．In base of the multi·concentrated mass model，the influence of the damp and blade and other additional structure iS considered，and which iS transformed to additional inertia，it makes the torsional vibration model of the shaft more close to the fact． Meanwhile，there is an actual example about Yimin 500MW unit in this paper，and torsional experiment is taken in locale，relevant procedure is compiled，