Optimization and Improvement of the Dynamic Parameter Test with Dynamic Machine Model Foundation at a Nuclear Power Plant

The steam turbine buildings of nuclear power plants are mostly located on hard rock subgrade, and the resonance frequency of the dynamic parameter test with model foundation reaches more than 100 Hz, Due to the defect of the low upper limit of the excitation frequency of mechanical exciters, the test method commonly used on soil subgrade is no longer applicable to the rock subgrade of nuclear power plants. Research has been conducted on the connection and testing methods between the exciter, cushion layer, exciter and model foundation. The testing equipment and methods have been optimized and improved, and a fully automatic constant disturbance force testing control system has been developed to make it more suitable for rock foundations in nuclear power plants. The test results could represent the dynamic characteristics of rock foundations accurately.