Physics-Based Rotor Dynamic Analysis for Failure Prediction Using Finite Element Techniques

摘要

Machinery such as steam turbines,rncompressors, and generators are rotating machines. Overrnthe years these machines have become very complex, duernto the increased need for higher speed rotating machinery.rnOvertime these machines develop excessive dynamicrnstresses if they are ran at speeds near to their naturalrnfrequencies or under abnormal operating conditions.rnMany technological advances in the aerospace andrnautomotive industries can be held accountable for thesernfaster speeds. Currently, machinery diagnostics is beingrnused to monitor rotating machinery and determine theirrncondition while in operation. To determine how a systemrnwill behave under certain operation conditions, a physicsbasedrnmodel of the system can be modeled and analyzedrnusing finite element analysis. These results will providernstress, deformation, flexibility, stiffness, and vibrationalrncharacteristics of the system. These results can showrnwhere the critical points are on the system and how thernsystem’s load is distributed. By using finite elementrntechniques engineers can simulate the behavior of thernsystem under different loading conditions, which canrnjustify the selection of a particular design alternative, andrnultimately save time and money. This paper discusses ourrntechnical approach used to develop a physics-based modelrnof a rotor dynamic system and discusses results of thisrnresearch effort.