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Indexed by:Journal Papers

Date of Publication:2020-06-01

Journal:MECHANICAL SYSTEMS AND SIGNAL PROCESSING

Included Journals:EI、SCIE

Volume:140

ISSN No.:0888-3270

Key Words:Cutterhead system; Uncertain model; Load interval; Vibration reduction optimization; Dynamic characteristics

Abstract:The cutterhead system is the most critical component of a tunnel boring machine (TBM). Because of its complex structure and the influence of many uncertain factors, which not only aggravate its vibration damage, but also make the prediction of its dynamic characteristics and the damage-resistant design very challenging, coupled modeling and the dynamic characteristic analysis of cutterhead system under uncertain factors are of great significance. In this paper, firstly, we considered the influence of geology and cutter position, the geological uncertainty model and the uncertainty model of the cutter position were established for the first time. The combination and transformation of the uncertainty model and the obtained load interval were realized successfully. Then, the load interval was substituted into the dynamic model, the multi-degree-of-freedom coupled dynamic model of the cutterhead system under uncertain factors was obtained. We combined interval theory with the central difference method to solve the dynamic model and obtained the dynamic response boundary. The necessity of considering uncertainty and the effectiveness of this method were verified by comparing the data under uncertain factors with the field test data and simulation data. Finally, we applied our method to an engineering cutterhead system. The results showed that (1) The five-part cutterhead has better vibration characteristics than the integrated cutterhead and two-part cutterhead; (2) When the mass of the center block accounts for 45-46% of the total, the vibration amplitude is the smallest. This provides a very important theoretical reference for structural design and vibration reduction optimization of the cutterhead system. (C) 2020 Elsevier Ltd. All rights reserved.