摘要
ＤＹＮＡＭＩＣＡＮＡＬＹＳＩＳＯＦ１１５０ＭＷＮＵＣＬＥＡＲＴＵＲＢＩＮＥ┐ＧＥＮＥＲＡＴＯＲＳＹＳＴＥＭＦａｎｇＺｈｉｃｈｕ（方之楚）（Ｄｅｐｔ．ｏｆＥｎｇｉｎｅｒｉｎｇＭｅｃｈａｎｉｃｓ，ＳｈａｎｇｈａｉＪｉａｏｔｏｎｇＵｎｉｖ，Ｓｈａｎｇｈａｉ...
The dynamic analysis of a 1150 MW turbine generator system using the transfer matrix method (TMM) and the finite element method (FEM) for computation is presented.Excellent agreement was obtained between critical speeds computed by TMM and FEM,respectively.The entire system modes are considerably different from the individual component modes.Using the mode shapes as a baseline,modal analysis of field balance can be implemented for this rotor system.A comparison of the experimental and theoretical predictions are presented,too.The forced responses of the system including foundation or pedestal mass,stiffness and damping effects were computed by means of FEM.It is approved that an appropriately formed and placed force couple,as a dynamic balance couple,may suppress strong forced vibrations in the vicinity of critical speeds close to the operating speed.Also,the bearings of low pressure turbines need to be well damped to avoid exciting lower and median critical speed modes.
