Modeling And Modal Analysis Of Gas Turbine Casing

The technology of gas turbine is a high-technology which integrates many other technologies.Its development embodies a country's overall level of the major equipment manufacturing industry in the world.The casing is one of the most important components of the gas turbine and is the foundation bed of the whole engine.The structure of the casing is very complicated and the manufacturing of the casing requires a high standard in accuracy and strength.As to design the casing is a demanding and time-consuming task,so casing designing takes up a larger proportion in the design of the gas turbine.Therefore,increasing the design efficiency of the casing will make a great contribution to reduce the cycle time in the work of gas turbine design.In this paper,the author combined the usage of software UG(Unigraphics) and ANSYS and built a gas turbine casing geometric model by UG and conducted the finite element model analysis by ANSYS according to the structure of gas turbine subsystem static shape.The author transmitted the gas turbine casing structure model into ANSYS by using the data exchange functions of ANSYS and UG and finally established and analyzed the finite element analysis model of gas turbine casing structure.This paper focuses on the research of simplifying the model of gas turbine case, UG modeling,mesh generation and the comparative analysis of the key parts of the case with the overall results of modal analysis.The paper also sums up the detailed steps of complicated large-scale structure modeling and finite element analysis.By such means, this research provides a feasible idea for analyzing the dynamic characteristics of complex structures.It also provides a scientific theory for the performance evaluation and designing improvement of the case.