Structure Analysis And Optimization Design Of The Main Girder Of Overhead Traveling Crane

With the development of technology and industry ,the requirementof the lightweight of mechanical structure is increasing.Manufacturingindustry of our country is facing the huge challenge,especially in thecrane industry. The crane carries on hoisting, transportation, loadingand unloading or the installment to the materials. It has a rather wideapplication in the various branches and sectors of national economy,and it is important in modern manufacture industry. The crane has theimportant influences to enhance productivity, guarantee the productquality, reduce the labor intensity and the production cost, enhancethe transportation efficiency, speed up the turnover and circulationof goods and materials. The crane is essential auxiliary facility inthe process of modernization production. It's also the essentialproduction equipment to organize production reasonably. It hasremarkable function on safety production and reducing the accidents.In order to win the domestic and foreign markets, we should enhance theproduction technology of the cranes, study and improve the crane'sstructure. This can make it reasonable, convenient and economical, andhave an important practical significance.Analyzing the status of overhead traveling crane in our country,we can find that the box-main-girder overhead traveling crane in ourcountry is too weight. So it needs more materials to lift the samecapacity than foreign country. Not only wasting the material but alsowasting the production inefficiency. This article presents an optimumdesign method to overhead traveling crane's main girder with thedefinite lift capacity and span. According to the above reasons, twokinds of methods are applied to optimize the box-main-girder overheadtraveling crane. Firstly, the finite element analysis software-ANSYSis used to analyze the box-main-girder structure, the optimizationprogram of it is applied to optimize the box girder. Secondly, theanalytical method is used to analyze the box-main-girder. The MATLABis applied to optimize the box girder. Comparing with optimum designabout overhead traveling crane's box-main-girder analytical methodand numerical method, we can analyze the variation regulars of optimumdesign variables, obtain the reliable optimized design result. Itindicated that the overhead traveling crane is highly lighted andeconomical after being optimized at the definite condition.The content of this article is divided into six charpters:1. IntroductionThis part introduces the topic's background, significance, and therelated concepts of overhead traveling crane's, as well as the contentsand methods of this research.2. Optimization design and finite element method's backgroundFirstly, introducing optimization design and finite element methodbriefly. It presents the process of optimization design, mathematicalmodel and all kinds of optimization methods. Secondly,it has describeddevelopment, calculation process and superiority of the finite elementmethod. Finally,the finite element analysis software was introduced.The ANSYS software is a large finite element analysis one. Through abrief introduction to the ANSYS, drawing basic functions andimplementation of analysis process based on ANAYS. In a word, thischapter introduced elementary knowledge of this article, in order toanalyze the box-main-girder overhead traveling crane and use theoptimum design.3. FEA of overhead traveling crane's main girderThis part presents the structural parameters and choosingproperties of materials on overhead traveling crane's main girder. Theanalysis of the main girder provides a simple mechanics model and makescertain the content of its analysis. Then it ascertains all kinds ofattribute of model and chooses shell63 appropriate. The box-main-girderoverhead traveling crane based on ANSYS was analyzed. The computationalprocess and solution process was introduced. The dangerouscross-sections were advanced. The maximum deformation and the maximumstress in the dangerous section are presented. They are compared withthe permissible stress and deformation. The result shows the stress andthe deformation value in the allowable range. The overhead travelingcrane's main box girder is accorded with the requirements of therigidness and the stress under static loading.4. Optimization design of overhead traveling crane's main girderThis part introduces the ANSYS optimization design and the APDLlanguage briefly. The main girder has carried on the parameter design.Obtaining the parameters, appointing the design variables, the statevariables and the objective function. The optimization design methodand executes method of optimization design were choosed. And then theoptimal solution was achieved. In the end, the conclusion of the weightreduces 29% by optimization is drawn.5. Optimization design and dynamic analysis of main girder via analysismethodIn order to achieve the formula of the flexibility and stress ofthe middle of the main girder, we simplified the girder as a girder ofconstant cross-section and analyzed it via analysis method. We useMATLAB not only to calculate the solution of the formula, but also tooptimize it. Then comparing it with the results from ANSYS. Meanwhile,we verify the results. At the end of this chapter, we do a dynamicanalysis of the crane, achieved the curve of the system response of themotion and the critical velocity when the system will be resonant, anddraw the conclusion that the car will never be resonant for the velocityof the car is far smaller than the critical one.6. ConclusionThis part shows the conclusion of this article, points out thedeficiency of it and the direction of this research.