Development And Application Of The Support System For Fatigue Life Prediction Of The Remanufactured Impeller

The centrifugal compressor is widely employed in such industries as petroleum, chemical engineering, mining, refrigeration and metallurgy to improve the gas pressure. The impeller, the core component of the centrifugal compressor, features complex structures and high additional value. As a new approach to resource recycling, impeller remanufacturing is the best way to handle so many retired centrifugal compressors. The remanufactured impeller works in a complex environment and has diversified types of fatigue failure. Service life prediction of the remanufactured impeller functions as one of the key technologies that guarantee the safety of the centrifugal compressor in the service. Therefore, theoretical methods supporting this service life prediction are badly needed.With the remanufactured impeller of the centrifugal compressor as the study subject, this thesis is part of the project of “Basic Science Issues on the Remanufacturing of Mechanized Equipment”, listed under Plan 973(National Key Basic Research Program of China). Based on the current prediction techniques for service life of remanufactured mechanical components, the author develops the support system for service life prediction of the remanufactured impeller by applying ANSYS in ways that provide criteria for qualified remanufactured impellers.First of all, based on the fatigue accumulation damage theory, the thesis presents a calculation model of the service life of the manufactured impeller and a simulation model framework for its service life prediction. By analyzing the strength of its centrifugal stress, rotating stall, residual stress, wake excitation, this paper studies these factors' influence on its service life, providing underload data for the prediction of service life of the follow-up support system.Second, based on the analysis process and prediction techniques of manufactured impeller service life, the thesis analyzes the functional requirements for the support system. And from the findings of this analysis, the thesis designs the whole functional structure of the system and produces system function structure chart and main route chart. This paper also designs in detail each key functional model of the system and the structure of the system's database based on functional requirements.Lastly, the paper describes the technologies employed in developing the support system and the implement methods for each main functional module. With the remanufactured impeller of Shenyang Blower Works Group Corporation as the case, the thesis conducts a numerical prediction of the service life of the remanufactured impeller by applying the support system developed by the author and then verifies the effectiveness and practicability of the support system.