scholarly journals Box Girder Optimization by Orthogonal Experiment Design and GA-BP Algorithm in the Gondola Car Body

Processes ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 74
Author(s):  
Wenfei Liu ◽  
Yuming Wang ◽  
Tianyou Wang
Keyword(s):  
Experimental Design ◽  
Orthogonal Experiment ◽  
Back Propagation ◽  
Optimization Method ◽  
Bp Algorithm ◽  
Orthogonal Experimental Design ◽  
Combined Method ◽  
Element Analysis ◽  
Box Girder ◽  
Car Body

Box girder is an important bearing and force transmitting component in the gondola car body; the rationality of its structure directly affects the life of the whole car body. In order to solve disadvantage of the traditional box girder optimization method, which mainly depends on design experience, the combined method of orthogonal experimental design and the genetic algorithm-back propagation (GA-BP) algorithm is used for the structural optimization of bolster beam in this paper. Nine groups of parameters were established by orthogonal experiment, which can give typical samples for GA-BP optimization. Then, the bolster beam is optimized by the GA-BP algorithm, and the new gondola car body model is established with the optimized parameters. The finite element analysis results show that the minimum stress is found by using the GA-BP algorithm, which is basically consistent with the simulation results. Finally, the results show that the combined method of orthogonal experimental design and GA-BP algorithm is feasible to the box girder optimization of the gondola car body. Meanwhile, the optimization results of bolster beam will provide a reference for the structural design of the heavy haul wagon body.

Analysis of Braced Excavation with Pit-in-Pit Based on Orthogonal Experiment

2011 ◽  
Vol 71-78 ◽  
pp. 4549-4553 ◽  
Author(s):  
Tian Ping Qian ◽  
Xiao Nan Gong ◽  
Ying Li
Keyword(s):  
Experimental Design ◽  
Orthogonal Experiment ◽  
Orthogonal Experimental Design ◽  
Foundation Pit ◽  
Supporting Structure ◽  
Wall Deflection ◽  
Whole Process ◽  
Design Software ◽  
Pit Depth ◽  
Significant Factors

In order to study the supporting structure under different distances between inner pit-in-pit and foundation pit, width and depth of pit-in-pit and general excavation depth of external foundation pit, PLAXIS is adopted to simulate the whole process of pit-in-pit excavation in a foundation pit of Shanghai. The factors which influence wall deflection are analyzed using orthogonal experimental design software. The results show that the factors which influence deformation of pit-in-pit and supporting structure of foundation pit are sorted with range value or sensitivity descending: depth of pit-in-pit, location of pit-in-pit, general excavation depth of external foundation pit, and width of pit-in-pit. Depth and location of pit-in-pit are the most two significant factors, and they have the strongest interactions.

scholarly journals Solid Modeling and Finite Element Analysis of an Overhead Crane Bridge

10.14311/712 ◽  
2005 ◽  
Vol 45 (3) ◽  
Author(s):  
C. Alkin ◽  
C. E. Imrak ◽  
H. Kocabas
Keyword(s):  
Finite Element ◽  
Optimization Method ◽  
Overhead Crane ◽  
Element Analysis ◽  
Box Girder ◽  
Shell Elements ◽  
Shell Models ◽  
And Performance ◽  
Design Calculations

The design of an overhead crane bridge with a double box girder has been investigated and a case study of a crane with 35 ton capacity and 13 m span length has been conducted. In the initial phase of the case study, conventional design calculations proposed by F. E. M. Rules and DIN standards were performed to verify the stress and deflection levels. The crane design was modeled using both solids and surfaces. Finite element meshes with 4-node tetrahedral and 4-node quadrilateral shell elements were generated from the solid and shell models, respectively. After a comparison of the finite element analyses, the conventional calculations and performance of the existing crane, the analysis with quadratic shell elements was found to give the most realistic results. As a result of this study, a design optimization method for an overhead crane is proposed. 

Orthogonal Experiment and Analysis of the Concrete which Use the Shell as Aggregate

2012 ◽  
Vol 204-208 ◽  
pp. 3942-3945
Author(s):  
Chao Gao ◽  
Zhu Pan ◽  
Xiang Zhen Wei
Keyword(s):  
Experimental Design ◽  
Design Method ◽  
Orthogonal Experiment ◽  
Concrete Strength ◽  
Orthogonal Experimental Design ◽  
Test Results ◽  
Systematic Analysis ◽  
Multiple Factors ◽  
Experimental Design Method ◽  
Aggregate Effects

In order to test the impactions on the strength of the concrete which Use the Shell as aggregate effects of the shell for the aggregate by the use of limited and comprehensive and effective consideration of multiple factors, Use of orthogonal experimental design method to test concrete strength of shells for the aggregate. And then through the systematic analysis of the test results, obtained the proportion of mixture for the best strength.

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