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• W2185388469 abstract "Gearbox top cover is a vital component of horizontally split integrally geared centrifugal compressor. Reliability of top cover is directly related to the structural rigidity and structural integrity of compressor. Assuming that the top cover is designed within the mechanical limits of its construction material, one of the most common causes of top cover failure is resonance. The aim of the designer while designing top cover is to have minimum weight and still have sufficient rigidity to avoid resonance. It is imperative; however, that rigorous engineering analysis is applied in the initial design phase to prevent resonance that will result in failure of gearbox top cover. To meet the objectives of designing a reliable integrally geared centrifugal compressor, gearbox top cover modal analysis is of utmost importance. Numerical modal analysis, usually based on Finite Element Method, is commonly used to determine the vibration characteristics, such as natural frequencies and the associated mode shapes of a structure. This paper addresses finite element analysis and modal testing of gearbox top cover of an integrally geared centrifugal compressor. The goal is to determine, verify and validate the vibration characteristics of the gearbox top cover using both analytical and experimental techniques. The 3-D solid model of the gearbox top cover was built using Autodesk Inventor®. ANSYS workbench 13® was used for preprocessing, solving and post processing. Modal analysis involved extraction of mode shapes and natural frequencies. Impact testing using hammer excitation was used to experimentally determine the vibration properties of the gearbox top cover. The results obtained by FEA modal analysis are compared and validated against modal test data. The results indicate that the natural frequencies of gearbox top cover predicted by FEA are within 8 percent of the measured natural frequencies of the modal test data, thus confirming the close agreement between FEA and experimental data. Finally a parametric study was conducted using FEA, to study the effect of wall thickness and rib thickness of gearbox top cover on its natural frequencies and associated mode shapes. It was found that the effect of varying casing wall thickness on the natural frequencies of the gearbox top cover was not significant, as compared to increase in the weight of the gearbox top cover. However, the effect of addition of rib on the natural frequencies of the gearbox top cover was significant, as compared to increase in the weight of the gearbox top cover." @default.
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• W2185388469 date "2012-01-01" @default.
• W2185388469 modified "2023-09-24" @default.
• W2185388469 title "Vibration Analysis of Gearbox Top Cover" @default.
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