Research On Software Development Of Load Test Simulation Platform For Cranes

In order to meet social and production needs, Large-tonnage cranes increasingly emerge. According to rules, deflections of crane girders should be tested in rated load both in use and periodic inspection to make sure meet the requirements. And there comes the problem that tests of deflections of large-tonnage cranes are unpractical considering fund demands worksite、equipment and demands of weights in rated load. However, the safe operation of cranes can not ensure without testing. In terms of a certain kind of cranes, their structures are similar except some parameters. And in this situation, professionals have to do a lot of boring repetitive tasks for modeling. In addition to, professionals make an effort to analyses of structure of traditional cranes and tests of deflections of large-tonnage cranes in rated load. As a result, development of easily operational software which is accessible to most of people will greatly enhance design efficiency as well as be significant to the progress of cranes.In this paper, lagre-tonnage cranes are the main study object.The author has finished some research and developed software of load test stimulation platform for cranes. And the software composed by parameters input module、structure analysis module、deflection prediction module and result output module.The main research contents are as follows:1. Use finite stripe method and finite element method to give a statics analysis to the same box girder sturucture, and then compare the results of deflections and stress. Take complexity and range of application into consideration, finite element method is the final solution of structure analysis module, meawhile, give an explanation of technology roadmap in structure analysis module.2. In the research of deflection perdiction, several classical methods including interpolation curve fitting and approximating function has bee adopted, the author draw a conclusion that errors are big when use these methods which based on specific functions to predict deflections of cranes. And then, the author use a group of practical test data to make a comparison of results of deflection prediction between back propagation and SVM (support vector machine), finally, decide to choose SVM to ensure precision.3. Get a set of practical test data by tests of deflection measurement. Afterwards, the author use SVM to analyze measured data、loaded weight and corresponding theoretical data of finite element analysis and predict deflection value in full load. Next, compare the previous deflection value with measured value to check feasibility of SVM.4. According to technology roadmap in deflection prediction module, use Matlab to write programs for predicting deflections in full load of cranes and generate an excutable file. By using the file and interface technology of Visual Basic, the author deflection prediction module embedded code in Visual Basic.5. In this paper, the author makes a sound exposition of key technology in the realizing process of software and utilizes Visual Basic to develop software of load test simulation platform.6. The author use software of load test stimulation platform for cranes to analyze structures of cranes, get deflections and intensity value and judge weather exceeds the allowable value or not. And then, use traditional mechanical method and SVM to predict deflections respectively, meanwhile, achieve deflections in the situation of over-loading and provide reference frame for tests of deflections.Software of load test stimulation platform for cranes developed in this paper gives a hand to users who do not master ANS YS on analyzing of structure for cranes, and save their time by automatically generating struacture calculation specification. Most important of all, users can perfect forcast stiffness of the girder combined with small load testing results of the software, which has great practical value and promotional value.