Itructural Analysis And Optimization Design Of Single-beam Bridge Crane

With the development of logistics technology, the expansion of industrial production scale and the improvement of automation, the importance of the crane has been realized by more and more people. At the same time, the design method of the crane has been gradually changing from traditional mechanical methods to modern CAD techniques. Traditional designs mainly use the classic mechanics and a lot of assumptions. It is concluded that the accuracy is poor, mechanical properties is surplus and unreasonable structure is easy to cause accidents. In addition, the current CAD technology is uneven in China. Only CAD application in enterprise stays in a drawing level and mechanical analysis is calculated by hand. Faced with the intelligent development of bridge crane, the traditional designing method must be changed.At first, this paper established three-dimensional model of every parts and components of single-beam bridge crane using Solidworks and defined the related parameters. Then the parts and components were assembled to three-dimensional model of single-beam bridge crane.To analysis the mechanical characteristics of the bridge crane, three-dimensional model should be reasonably simplified before importing the finite element analysis software-ANSYS Workbench. The stress distribution and deformation condition were calculated. The maximum stress appeared in the junction of main beam and the end of beam. Due to the existence of stress concentration phenomenon, it was necessary to optimize the design. The junction of main beam and end beam was optimized analysis using Design Exploration module of ANSYS Workbench. The response surface and sensitivity curves of design parameters and target parameters were found. The target parameters included quality, volume, the maximum equivalent stress and maximum deformation. At the same time, optimum solutions of design parameters were obtained. By integrating optimum solutions reasonably, a group of satisfactory solutions were obtained.Finally, applied single-beam bridge crane after optimization design to dynamic analysis, the nature frequencies and nature mode shapes under the action of full load at mid-span can be calculated. Shock vibration of single-beam bridge crane’s bridge was analyzed when cargo left the ground suddenly in lifting process. The change of displacement, velocity and accelerated velocity in vertical direction in the maximum deformation of the machine were obtained. The reliability of single-beam bridge crane after optimization design was validated.