Method On Discrete Optimum For Boarding Bridge Structures Based On Neural Network And Its Application

With the development of economy and the improvement of living standard, more and more people go abroard by airplane, which brings about some troubles to the airplane company. In order to make passengers safe and cozy and manage the airfield better ,the advent and application of boarding bridge solves this problem successfuly.The boarding bridge is an auxiliary equipment widely used in airfield, and it connects the hall for passengers and the body of the plane. The passengers go on or off the plane through the boarding bridge, and they will feel safe and comfortable. Moreover, the faster the society develops, the more boarding bridges are needed.As a designer , how to design a boarding bridge according to the concrete situations ? On the one hand , we should reduce the cost for the maker, On the other hand, we should safeguard the passengers.So I decide to carry out the discrete optimum of the boarding bridge structures.Firstly, the thesis establishs the finite element method based on ansys, sets up the relations between some important parameters of boarding bridge structures and the maximum stress of it, provides the data for the below.Secondly, the thesis discusses the dynamical model , gives the arithmetical formula of the hidden layer, dedues and demonstrates the back propagation arithmetic of neural network. Also , the thesis uses the neural network toolbox to train the network and gets the nonlinear relations between the outputs and the inputs ,gives the weights and bias of the neural cell.Thirdly ,the thesis includes most kinds of working conditions of the construction and makes a concrete analysis of concrete conditions, founds the mathematical optical models based on optimum theory. The minimal weigh of boarding bridge is the target of the model and the section sizes are the design variables .The constraint equations are listed based on satisfying the demand of intensity rigidity stability and technology.Finally, the thesis discusses some kinds of arithmetic, analysis and chooses an appropriate one to solve our question. A difficult question .design variables belonging to discrete variables, was well done by MATLAB with powerfull programming environment and high-efficient optical toolbox functions,which isthe best computer aided calculating tool nowadays. The thesis proved the optical method is simple and efficient and the result is reliable .It will well be used in engineering.