Investigation and Mitigation of Over-Testing Behavior in an Industrial Seismic Qualification Table

柯蒂斯-赖特加拿大核能公司(CWNC)是一家提供支持核电行业的广泛产品和服务的公司，包括不同部件的地震测试。经常使用最先进的地震测试台对与安全相关的部件进行地震测试。地震台是一种用来在六个自由度内对结构模型或构件进行大范围模拟地震动的设备。模拟地面震动应遵循被称为所需反应谱(RRS)的理论反应谱。然而，在某些情况下，如果不能准确地模拟这种响应，则无法测量该表的实际响应，这被称为测试响应谱(TRS)。如果TRS与RRS显著不同，则应应用反馈控制，以使TRS最多等于RRS的两倍。如果在测试用例中没有实现这一点，则会出现过度测试的情况。目前还不清楚为什么这个问题会出现在表格中。因此，这项提议的主要目标是调查地震表的过度测试行为，并开发一种可以实现的有效技术来缓解这种行为。该项目的成果将增强核工业中使用的安全相关和关键部件的抗震鉴定的信心。

Curtiss-Wright Nuclear Canada (CWNC) is a company that offers a wide range of products and services that support the nuclear power industry including the seismic testing of different components. Seismic testing is frequently performed on safety related components using state-of-the-art seismic testing table. The seismic table is an equipment that is used to shake structure models or components with a wide range of simulated ground motion in six degrees of freedom. The simulated ground shaking should follow a theoretical response spectrum termed the Required Response Spectrum (RRS). However, in certain scenarios, if this response is not simulated exactly, the actual response of the table can not be measured, which is referred to by the term, Test Response Spectrum (TRS). If the TRS varies significantly from the RRS, a feedback control should be applied so that the TRS is at most equal to two times the RRS. If this is not achieved in the tested case, an over-testing situation is obtained. It is not clear why this issue exist in the table. Therefore the main objective of this proposal is to investigate the over-testing behavior of the seismic table and develop an effective technique that can be implemented to mitigate this behavior. The outcome of this project will enhance the confidence in seismic qualification of safety related and critical components used in the nuclear industry.