摘要
为研究核电汽机基础在机器振动和地震作用下的动力响应协同控制问题,推导了汽机转子-轴承座-基础结构体系运动方程,验证了理论计算和数值模拟的吻合性。以某核电项目2×1100 MW半速核电汽轮发电机组基础为工程背景,通过一维及二维扰力输入的振动分析,对比了弹性基础与刚性基础模型在转子不平衡力作用下的结构稳态响应。采用7条地震动输入,对比了基于塑性铰的弹性基础与刚性基础模型结构的塑性开展情况;从层间位移角、构件内力、扰力作用点加速度三个方面,探究了弹性基础的隔震性能。结果表明:机器振动作用下,应用弹簧隔振器会放大扰力作用点的位移响应,将下部框架位移响应降低约35%~90%;地震作用下,布置弹簧隔振器可有效缓解地震作用下的结构塑性开展,将扰力作用点的加速度响应减小约10%~40%。
To study the dynamic response combined control problem of nuclear power turbine generator foundations to both machine-and earthquake-induced vibrations,this research derived the motion equations for the turbine rotor-bearing seat-foundation structure system.The consistency between theoretical calculation and numerical simulation was then verified.On the basis of the engineering context of the foundation for two 1100 MW half-speed turbine generator units in a nuclear power project,vibration analyses using one-dimensional and twodimensional inputs were performed.The steady-state response of the structure to the rotor unbalanced force was compared between the elastic and rigid foundation models.The plastic deformation development of the elastic and rigid foundation models were analyzed under 7 earthquake ground motions accounting for the plastic hinge modelling.Accordingly,the seismic isolation performance of the elastic foundation was explored in terms of the story drift,internal force of components and acceleration at unbalanced action spots.The results show that under machine-induced vibration,the application of spring isolators increases the displacement response at unbalanced action spots,but reduces the displacement response of the lower frame about 35%~90%.Moreover,the use of spring isolators effectively decreases the development of structural plasticity and reduces the acceleration response at unbalanced action spots around 10%~40%under earthquakes.
作者
周颖
李济舟
张增德
陆德成
郭城志
ZHOU Ying;LI Jizhou;ZHANG Zengde;LU Decheng;GUO Chengzhi(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;East China Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Shanghai 200063,China)
出处
《振动工程学报》
北大核心
2025年第12期3131-3144,共14页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(52025083)。
关键词
弹性基础
刚性基础
不平衡力
振震双控
动力响应
elastic foundation
rigid foundation
unbalanced force
integrated control of engineering vibration and seismic vibration
dynamic response
