CAJ | 학술논문

水轮发电机组轴系的转子动力学特性对机组振动特性和稳定性有很大的影响。基于弹性支承的刚性转子模型，并在充分考虑轴承油膜动力特性和转轮密封处的刚度和阻尼作用下，模拟在实际运行条件下的上、下导轴承，水导轴承及考虑转轮密封处的等效刚度和阻尼，对某高水头混流式机组轴系的弯振、扭振及轴系的稳定性3个方面进行计算分析。计算得到机组在额定转速和飞逸转速运行时的临界转速及对数衰减和临界阻尼比，客观地反映描述了机组运行过程中的轴系特性。
수륜발전궤조축계적전자동역학특성대궤조진동특성화은정성유흔대적영향。기우탄성지승적강성전자모형，병재충분고필축승유막동력특성화전륜밀봉처적강도화조니작용하，모의재실제운행조건하적상、하도축승，수도축승급고필전륜밀봉처적등효강도화조니，대모고수두혼류식궤조축계적만진、뉴진급축계적은정성3개방면진행계산분석。계산득도궤조재액정전속화비일전속운행시적림계전속급대수쇠감화림계조니비，객관지반영묘술료궤조운행과정중적축계특성。
The dynamic characteristics of the rotor of the hydro generating unit have a great influence on vibration characteristics and stability .In this paper ,the rigid rotor model is based on elastic support ,and considering the effect of bearing oil film dynamic char‐acteristic and the runner seal stiffness and damping ,simulation of the actual operating conditions of the upper ,lower guide bearing , water guide bearing and considering the equivalent stiffness and damping of runner seal ,the shafting stability of a high head Francis turbine is calculated and analyzed from two aspects :the shafting torsional vibration and bending vibration .The conclusion of calcula‐tion the critical speeds and logarithmic at rated speed and the runaway speed reflect the description of the shafting characteristics in the process of unit operation objectively .