Research On Optimization Design Of A Double Box Girder Gantry Crane

As a piece of special mechanical equipment that can lift and translate materials within a certain range,cranes are often widely used in important fields such as factories,mines,and large ports.To meet the needs of reducing production costs and using various spaces,the lightweight and diversification of cranes have become particularly important.This dissertation takes the lightweight of a certain double box girder gantry crane as the research goal,and studies the following research contents:(1)Build the parametric model of the crane.After fully grasping the structural features of the double box girder gantry crane as a whole,the finite element analysis software ANSYS is used to carry out parametric modeling.When building the crane model,the tiny structures on the crane that has little influence on the static analysis results are used.It is omitted to improve the modeling efficiency.(2)Dynamics simulation of the crane rigid-flexible coupling model.Set up the rigid-flexible coupling model of the crane operating mechanism,and use Adams software to carry out dynamic simulation analysis of the crane operating mechanism;when the crane trolley moves at different stations of the main beam guide,the dynamic response curve and changes the law of the crane operating mechanism in terms of rope force,horizontal sway force of the crane weight and sway displacement of the crane weight relative to the trolley change with time,to get the dangerous working condition of the crane.(3)Carry the static simulation of the crane.Using the finite element analysis software ANSYS,the static analysis was carried out on the working conditions selected in the dynamic simulation of the crane,and the distribution of the stress and total displacement of the crane under the three working conditions was obtained.Finally,the kinematics simulation results and the static simulation results are compared and analyzed,which not only tests the accuracy of the static simulation but also obtains the same dangerous conditions as the dynamic simulation analysis.(4)Carry out topology optimization of cranes.Through the static analysis of the crane,it is found the crane has a large optimization space;the dangerous conditions got from the previous analysis are selected as the research object,and the topology optimization of the overall structure of the crane is carried out by using the variable density method,and the total mass of the optimized crane was reduced by 3.9%.(5)Optimize the size of the crane.Based on topology optimization,the zero-order optimization method,the equal-step search method,and the guide-weight method is used to further study the structure of the crane.The plate thickness is selected as the design variable,and the objective function is set as the total mass of the crane’s overall structure.By comparing the three optimization methods,it is found the guided weight method has achieved the ideal effect of reducing weight by 23.6% after only five iterations.Using the design ideas from dynamics,finite element static analysis to an optimized design,the guided weight method is used to optimize the design of the double box girder gantry crane,which greatly improves the efficiency of the iterative crane optimization design and provides the necessary reference value for further design and research of the crane.