Rotating platform is one of the railway cranes key components, for the installation of crane jib, lifting mechanism, luffing mechanism and rotating mechanism. In order to guarantee the normal operation of the crane, the rotating platform should have enough stiffness and strength. Based on the finite element analysis software WORKBENCH, this paper takes a kind of 160t double rotary rescue railway crane as the research background, and completed the parametric modeling and structure analysis of the rotating platform including the flexible counterweight for the first time. Thus avoiding the errors brought by the equivalent weight before. And on this basis, through the finite element analysis software ANSYS, the thickness of various parts of the rotating platform was optimized. As a result, the weight of the rotary table has a significant reduction. This will provide a new method for the design of railway crane in the future.
Based on the powerful finite element analysis software-ANSYS Workbench co-simulation platform, boom buckling instability capability has been studied by using the seamless interface of DM(Geometry Modeler),Mechanical(Structure Analysis)and DX(Optimization Design)module. Firstly, the trend figure that the thickness of each plate increasing has influenced on the overall buckling limit has been got. Applying the rule, the actual structure was optimized and the optimal combination of thickness was found. Under the condition of the buckling limit, the weight of the crane arm has a significant reduction compared with the actual structure. Finally, this result which is reasonably practicably provides a reference method for engineering mechanism design including large-scale crane arm in the future.
Taking the minimum to cylinder thrust force, turntable force and boom force as the objective function then establish the optimization mathematical model of the verifying three nodes, taking BP Neural Network as the main method instead of the cumbersome formula derivation. This article puts forward a Hybrid Genetic Algorithm flow set of solving pareto optimal solution, It is achieved by mixed-using Niche Technology, Groups Sorting Technology. The optimal position of the arm verifying three nodes is conformed by programming using Matlab genetic algorithm toolbox. And the force of the fuel tank , boom and turntable is effectively mitigated. This gives a appropriate reference for the next boom verifying three nodes position to determine and the optimal design of similar structures in other engineering machinery.
The existence of boundary condition and friction are difficult to predict which makes the sliders contact situation extremely complex. The actual response of the contact region becomes a tough research by using traditional method. Taking the cylinder supporting function into account, the polygonal and similar-oval Jib models are established. Research of the stress distribution and the stress concentration phenomenon is analyzed. The results indicate that stress distribution of the sliders of the similar-oval Jib is more uniform in comparison with the polygonal Jib that it can ameliorate the stress state of the contact region and enhance the partial stability of the Jib.
From the similar analysis theory, choose the bamboo as the bionic object for boom section design; based on the microscopic characteristics of the bionic object, the author design the boom section with the idea of multistory steel-plates. Based on ABAQUS Standard solver for finite element analysis, gets the boom’s properties on strength and stiffness. compared with the traditional cross-section, bionic boom is superior on strength. The bionic cross-sectional design idea breaks the traditional ways of crane boom design, optimization, and provides a new reference direction.
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