论文部分内容阅读
以国内首个EPR1750核电站汽轮发电机弹簧隔振基础为例,对弹簧隔振基础的抗震设防水准进行了分析探讨,建议基于性能设计要求,弹簧基础按基本烈度进行弹性设计;对隔振器采用金属弹簧器的弹簧隔振基础的结构阻尼比进行理论推导,继而对隔振器采用金属弹簧器+粘滞阻尼器的弹簧隔振基础的结构阻尼比进行理论分析,得出这2种由组合材料组成的弹簧基础的结构等效阻尼比求解方法;弹簧基础第4阶振型为局部竖向振动,结构阻尼比主要来自隔振器的贡献,数值与其余各阶振型差别较大.
Taking the first vibration isolation foundation of the turbine of EPR1750 nuclear power plant in China as an example, the seismic fortification level of the spring vibration isolation foundation is analyzed and discussed. It is suggested that the spring foundation should be designed flexibly according to the basic intensity based on the performance design requirements. The structural damping ratio of the spring vibration isolation foundation of the metal spring was deduced theoretically, and then the theoretical damping ratio of the spring vibration isolation foundation of the vibration isolator using metal spring + viscous damper was analyzed. The damping ratio of the fourth base of the spring foundation is the local vertical vibration, the damping ratio of the structure mainly comes from the contribution of the vibration isolator, and the difference between the numerical value and each of the other modes is quite different.