Structural Dynamic Behavior of Turbo Generator Foundation Connected with Passive Supplemental Damping Devices

Study the dynamic properties of Turbo-Generator foundation with and without passive supplemental damping are considered in this paper using finite element method. The high vibrations of machines especially Turbo-Generators machines lead to use massive masses of foundations to absorb the big amount of dynamic loads generated by machines. The work in this paper investigates the effect of using passive supplemental damping devices such as lead rubber bearings to accommodate these big amount of dynamic loads, also investigates how it could lead to change the dynamic responses of Turbo-Generator foundations to be in the safe frequency range with less masses and better dynamic performance. The analysis of the system with and without supplemental damping devices is performed which shows the significant effect of using damping devices. The results show that damping devices could lead to decrease masses of top deck of the machine foundation by 20% with acceptable dynamic responses compared with foundations without supplemental damping devices. A proof of the high significant of damping devices especially lead rubber bearings in decreasing the construction cost and changing the dynamic behavior of Turbo-generator machine foundation is presented by performing a detailed comparison study with and without damping devices.