Abstract
The Three Gorges Project (TGP) ship lift employs 4 safety mechanisms, of which one consists of a rotary locking screw and a nut jaw column. The thread pair clearance (TPC) of safety mechanisms is set at 60 mm. Owing to influential factors, the TPC changes randomly in the upward/downward-stroke of the ship chamber. If it diminished to 0, the safety mechanism would be jammed, thus resulting in disastrous accidents. By the bearing test of the drive system, 7 influential factors have been studied; 15 other influential factors (including 8 factors of manufacture and installation deviation, 3 factors of chamber offset, 2 factors of external load and 2 factors of wear) have been analyzed based on the design data. Results by the limit superposition reveal that the TPC change varies from −43.8 mm to +48.4 mm when the water level of the chamber ranges from 3.4 m to 3.6 m. According to the Gaussian distribution, the probability of the TPC change varied from −53.7 mm to +58.8 mm in the most detrimental status is 99.74%, therefore, the TPC remains in a safe condition. This paper puts forward that two-phase operation of the drive system should be adopted so as to reduce the maximum TPC change to −44.6 mm.
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Foundation item: Supported by the Key Research Program of State Power Corporation (SPKJ016-06), the Key Scientific Research Project of Hubei Province (2004AC1O1D31) and the Key Scientific Research Project of China Three Gorges Corporation (0722018)
Biography: SHI Duanwei, male, Professor, Ph.D., research direction: mechanical system dynamics, CAE.
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Shi, D., Cheng, S., Zhao, T. et al. Safety analysis for thread pair clearance of safety mechanism of Three Gorges Project ship lift. Wuhan Univ. J. Nat. Sci. 19, 535–543 (2014). https://doi.org/10.1007/s11859-014-1049-6
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DOI: https://doi.org/10.1007/s11859-014-1049-6