摘要
对核电安全级数字化控制系统(SDCS)机柜结构进行详细设计,采用有限元分析中的响应谱分析法,对该设备的抗震特性进行校核。加工出设备样机进行抗震性能鉴定试验,对地震作用下机柜的结构响应特性与抗震性能进行分析。研究结果表明:该核电仪控机柜首阶模态频率为15.257 Hz,其主要振型为机柜框架整体沿横向的偏摆运动,机柜的自然频率远离地震幅值放大区,具有一定的安全裕度。响应谱分析结果表明:在机柜的首阶模态振型与配重区域共同作用下,机柜最大应力位于机柜右前立柱与底框的焊接区域,最大Mises应力为158 MPa,小于机柜材料的屈服极限,因此在地震作用下该型机柜具有较好的抗震能力。地震试验分析结果表明:地震台面的振动信号在逐渐传递至机柜的过程中经过一定程度的放大。在纵向方向上,机柜重心处的振动加速度幅值最大。在横向方向上,振动信号放大最为明显,振动幅值随着机柜高度逐渐变大,使得在机柜柜顶区域,地震信号放大效果最为显著。抑制机柜的横向运动是改善结构抗震性能的关键。设计的核电仪控系统抗震机柜顺利地通过核级设备抗震试验,所提出的设计、分析、试验和结果为核电仪控机柜的设计提供参考依据。
The cabinet structure of nuclear safety level digital control system is designed in detail,response spectrum analysis is performed to verify the ability of the cabinet structure in resisting seismic effect.Additionally,the corresponding seismic test is carried out.Results show that the first natural frequency of the cabinet is 15.257 Hz,and the mode shape is characterized by the lateral deflecting motion.The natural frequencies of the cabinetkeep away from the earthquake amplitude.The response spectrum analysis results show that the maximum stress of the cabinet is located in the welding area between the front right column and the bottom frame,which is caused by the combined effect of the first mode shape and mass distribution.The value of the maximum stress is 158 MPa,which is less than the yield limit of the Q235B,thus the cabinet is proved to be able to resist the seismic effect.The test results show that the vibration signals of seismic station are amplified to some extent in the process of transmitting to the cabinet gradually.In the longitudinal direction,the vibration acceleration amplitude at the center of cabinet gravity is the largest.,while in the lateral direction,the vibration amplitudes are increase with cabinet height.The suppression of the lateral movement of the cabinet is the key to improve the seismic ability of the structure.The cabinet designed in this study passed the seismic test of nuclearlevelequipmentsuccessfully,the design,analysis,test and research results provide the reference for the design of nuclear instrument control cabinet.
作者
刘明星
杨静远
王东伟
马权
吴志强
LIU Mingxing;YANG Jingyuan;WANG Dongwei;MA Quan;WU Zhiqiang(Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610041,China;Sichuan University,Collegeof Computer Science,Chengdu 610065,China;Nuclear and Radiation Safety Center,Beijing 100082,China)
出处
《重庆理工大学学报（自然科学）》
CAS
北大核心
2021年第10期224-232,共9页
Journal of Chongqing University of Technology：Natural Science
基金
国家自然科学基金项目(52075460)
四川省杰出青年科技基金项目(2020JDJQ0068)。
关键词
核电站
仪控系统
机柜
地震
响应谱分析
nuclear power plant
instrument control system
cabinet
seismic
response spectrum analysis
