核电厂地震加速度计现场标定振动台的研制

Development of Shaking Table for the Nuclear Power Plant Seismic Accelerometer Calibration on Site

针对现有的核电厂地震加速度计的标定方法无法同时涵盖规范规定参数检定要求,也无法实现核电现场就地标定检测的问题,设计了一种基于柔性金属弹片悬挂结构的便携式振动台,分析了振动台的机械结构,给出了振动台动力学方程;依照实际工程应用需求,选取了合适的参数和材料,进行了振动台的三维建模和有限元分析,制造了振动台样机,并对样机进行了测试,测试结果表明,振动台固有频率在1Hz以下,量程可达到1g,横轴灵敏度小于1%,净重在40kg以内,具备便携式特征,满足核电厂地震加速度计的现场标定参数检测的要求。

In view of the problem of the Nuclear Power Plant seismic accelerometer calibration methods can′t synchronizing cover parameters verification given by related codes and standards,also can′t carry out the seismic calibration works on site,this paper proposes a portable shaking table based on flexible metal shrapnel suspension structure,the mechanical structure of the shaking table was analyse,and the dynamics equation was given;in accordance with the actual engineering application requirement,we select the appropriate parameters and material and establish the 3D model of the shaking table and make finite element analysis,at last,the engineering prototype was manufactured and the parameters are tested,the test results show that the natural frequency is below 1Hz,and the range can be up to 1g,and the transverse sensitivity is less than 1%,and the net weight is within 40kg,the vibration parameters and the portable structure of the shaking table is accord with the calibration test requirements of the nuclear power plant seismic accelerometer on site.