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

Abstract

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.

Determining the features of loading the bearing structure of a multifunctional car under operating modes

“…The results of our calculations showed that under the considered load modes, the strength of the boiler is ensured (Fig. 4,6,10). This is because the derived maximum equivalent stresses in its structure are lower than permissible ones.…”

“…The merit of our study in comparison with works [1-3] is that we have proposed a model that makes it possible to determine the load on the car under different operating modes and types of transported cargoes. Unlike [4][5][6][7], the proposed measures for the structural execution of the car contribute to ensuring its versatility. Our structural solutions could be used to modernize freight cars, unlike those described in [8,9].…”

“…Optimization of the load-bearing structure of the freight car is carried out in [4]. A gondola car was chosen as a prototype.…”

“…Our review of literary sources [1][2][3][4][5][6][7][8][9][10][11] reveals that it is expedient to conduct research into the possibility of designing a multifunctional structure of the car for the transportation of a wide range of cargoes. This will help construct competitive high-efficiency rolling stock and contribute to improving the efficiency of rail transportation.…”

Temperature effects on railway rolling stock components

“…The peculiarities of modernization of a freight car of Sgnss type on the basis of dynamic tests are considered in the [68]. The results of numerical and experimental modeling of car load are given.…”