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Strength Analysis and Structure Improvement of an Accessory Drive Casing

Author: HuangShouWei
Tutor: SongYingDong
School: Nanjing University of Aeronautics and Astronautics
Course: Aerospace Propulsion Theory and Engineering
Keywords: Accessory Drive Casing Finite Element Structure Strength Fatigue Life Mode Structure Improvement
CLC: V231.91
Type: Master's thesis
Year: 2008
Downloads: 217
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Abstract


The accessory drive casing of a certain aero-engine is an important loading component, whose structure and loads are complicated. This thesis aims at the research on the computation of loads、strength and fatigue life, and the structure improvement of this casing as well.The casing’s aerodynamic loads were computed and the calculation model of external forces was established according to the engine’s structure. Then the expressions were derived and the external forces of the casing were computed.The 3-D model of casing was established by Pro/E and then was imported to ANSYS. The stresses of casing under the axial load alone and the axial and maneuvering loads together were calculated respectively. The results were compared with the data obtained from the ground bed test and indicated that the calculation results agreed with the test data well. The casing’s maximum stresses corresponding to these two load states were less than the material’s tensile strength. Therefore the static strength fully met the requirement of strength. In addition, the casing’s first ten constraint modes and the first five nonzero free modes were obtained through calculation.The fatigue lives of supporting plates and mounting points were computed by EGD-3 fatigue life analysis method. The results showed that the plate and mounting points’fatigue lives were 1.9335×107and 0.7283×107 hours respectively.To reduce the maximum stress of the casing’s supporting plate, the geometry dimensions’influences on stress were studied. Results showed that among the chosen design variables only the radius and axial length of the supporting plate had distinct influences and other parameters’effects could be neglected.

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CLC: > Aviation, aerospace > Aviation > Aero-engine ( propulsion system ) > Engine theory > Engine structural mechanics > Strength Theory and Computation
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