Please use this identifier to cite or link to this item: http://localhost:8081/xmlui/handle/123456789/8336
Title: VIBRATION RESPONSE OF TURBO-GENERATOR FOUNDATIONS
Authors: Shukla, Anoop
Keywords: CIVIL ENGINEERING;VIBRATION RESPONSE;TURBO-GENERATOR FOUNDATIONS;HYDROPOWER PLANTS
Issue Date: 1998
Abstract: In order to meet the power demand, a large number of thermal power plants are being constructed in the country in addition to hydropower plants. Turbo-generators are the main component of thermal power plants. The turbo-generators are usually supported on a large framed foundation. These framed fOundatipAs are subjected to static machine loads and dynamic loads caused by machine imbalance, short circuits, blade losses and earthquakes. A detailed dynamic analysis is important for such structures in order to achieve a safe and economical design for better performance. This study deals with the vibration response of an actual 25 MW turbo- generator foundation which has experienced high vibrations. The unit has a turbine which is connected to a generator through a gear box (gear ratio 1 : 4), i.e., the turbine running at 6000 r.p.m. and the generator at 1500 r.p.m. Dynamic analysis of the unit has been carried out here to bring out the cause of such vibrations. Response of the T.G. foundation has been studied due to harmonic ground motion and normal imbalance in machine to evaluate its performance. The response has been plotted in the entire range of machine speed. The effect of shear deformations and finite width of joints has been studied on the natural frequencies and amplitudes of vibration of the system. It is observed from a study of the response curves that the effect of shear deformation is small in this case. However, the effect of the finite width of joints is significant. The vibrations amplitudes at the rated speed of the machine are within permissible limits. The excessive vibrations in the unit, which have been experienced in the past, are essentially caused due to misalignment and mechanical effects.
URI: http://hdl.handle.net/123456789/8336
Other Identifiers: M.Tech
Research Supervisor/ Guide: Saini, S. S.
metadata.dc.type: M.Tech Dessertation
Appears in Collections:MASTERS' THESES (Civil Engg)

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