广东省已基本建成的某桥在施工期间遭到船舶撞击，为判断其桩基础是否受损这一难题，我们根据系统模态辨识的可控度和可观度试验设计理论，用最小的能量、最少的激点和少量的传感器，成功地解决了这一难题。 A bridge that has been basically completed in Guangdong Province was hit by a ship during construction. To determine whether the foundation of the pile is damaged, based on the controllable and observable experimental design theory of system modal identification and the minimum energy, The least number of excitations and a small number of sensors, successfully solve this problem.