Experimental study on dynamic characteristics of foundation for large turbine-generator set

摘要

Based on a large turbine-generator foundation in the actual project, dynamic characteristics of 1:10 model of this foundation are obtained from modal analysis of the random excitation method. Natural frequency, mode shapes and damping ratio of the structure are acquired. The results of basic vibrating displacement under operation condition are obtained according to the vibration analysis of response prediction. Besides, using hammer pulse method to actually measure the support dynamic stiffness of bearing pedestal of this turbine-generator, to examine whether the support dynamic stiffness of this foundation meet the requirements of the current specifications. Finally, the results shows that dynamic characteristics of the foundation perform well and the structural design is safe and reasonable.