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《Journal of Ship Mechanics》 2004-02
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Variable-drive finite element method based optimal design for the main frame of deep manned submersible

HONG Lin 1 ,LIU Tao 2 ,CUI Wei-cheng 2 ,XIE Xi-nan 2 ,QI En-rong 2 (1School of Naval Architecture and Ocean Engineering,Shanghai Jiao Tong University,Shanghai200030,China;2China Ship Scientific Research Center,Wuxi214082,China)  
The main frame of a deep manned submersible is a complex space rigid frame.It is designed as a structure to install a manned pressure hull,batteries,electric inverters and a distributor,main ballasting tanks,buoyancy materials and so on.It is not enough to design based only on experience,thus it is essen - tial to develop and apply the optimization method to the present large scale complex structures.On the ba - sis of the design consideration and applying the variable drive modeling method,this paper mainly de - scribed the optimization of the main frame on two aspects by the FEA software-MSC Patran/Nastran.One was using the static analysis function to optimize the preliminary schemes by the Evolutionary Structural Optimization method.After the first level optimization,the paper went on to the size optimization using the following three methods:modified method of feasible directions,sequential linear programming and se - quential quadratic programming.The results indicate that the weight of the main frame structure can be further reduced and the optimization methods presented in this paper are reliable and practical for the op - timal design of engineering structures.This paper also demonstrates the phenomena of multi-peak value of the objective function due to the complicated structure and its nonlinear.
【CateGory Index】: U674.7
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