Tower Crane System Dynamic Response And Promotion Process Simulation Study

With the need of the development of engineering construction,the cranes is increasingly playing an important role.At present,domestic and foreign crane design specification,When considering the impact of kinetic effects on the structure of the tower crane(Hereinafter referred to as the tower crane),crane structure is not really on kinematic and dynamic analysis directly from the perspective of computational analysis,tower crane traditional designs are always two-dimensional motion from the perspective of the tower crane stress analysis,however,in the field of construction,which is often carried out hoisting,slewing and luffing and other space complex coupled motion.Accurate description and accurate calculation of the tower crane structure system under external excitation dynamics process and tower crane work of various spatial coupling movement work,will provide theoretical and practical guidance for the tower crane design,production.In this paper,with the level arm luffing tower crane as an example,analysis of the tower crane and tower crane working process in the dynamic response under the action of external excitation.Firstly,the results of research on the world commonly used in a variety of tower crane dynamic design technology and many scholars at home and abroad are analyzed and compared,pointing out that the traditional method can be improved.Secondly based calculation method in the traditional design,put forward the innovation of using space vector dynamics theory,dynamic analysis on the composite motion of working state of the tower crane,tower crane in deducing the calculation method of complex working condition of crane load.The optimization method is applied to solve the kinetic model of the tower crane,combined with VB of tower crane analyze the response under a variety of external excitation,and the dynamic response by digital and image more intuitive presentation,provide an effective basis for the calculation,design and application of tower crane.Finally,for the proposed algorithm and solving thoughts are analyzed,there are still problems in the calculation process that the proposed direction for improving the algorithm.The solution combines,dynamic response analysis for the selection of a certain type of tower crane and study on inverse problem when lifting heavy objects trajectory is simulation?Structural dynamics applications,structural mechanics theory tower system has been simplified dynamics model,a dynamic model for the tower crane in a typical response under the action of external excitation is applied to solve the goal and fourth-order Runge-Kutta method with VB programming for solving their dynamic response.Through the analysis of the dynamic response,and can clearly understand the key of the tower crane structure design,to provide a favorable basis for the future design work of the tower crane,the real analysis of the dynamic load,instead of the static analysis instead of dynamic analysis approach,so as to achieve the purpose of the structure optimizing?According to the theoretical mechanics,mechanics of materials,structural mechanics and elasticity theory,when the tower crane lifting heavy lifting,luffing,slewing and other space sports complex has been simplified,the establishment of differential equations of motion,taking the displacement function of tower crane working process as the objective function,and taking the starting position?driving force of the work process as the constraint conditions,by solving the optimization algorithm,obtained the displacement function changes with time.For the inverse problem,the differential equation of motion is established is the same,driving force function of the tower crane working process as the objective function,the working process to start position,end position as constraints,by solving the optimization algorithm,obtained the function of driving force changes with time,based on the lifting heavy objects trajectory when the forward and inverse problems of simulation analysis,fully understanding the relationship between the displacement,the driving force and time,and provides a theoretical basis for the path planning when lifting heavy objects trajectory.