The Research Of Large Tonnage Dual Rotary Telescopic Railway Rescue Crane Three-section Optimization

Today cranes have the trends of large tonnage and high lifting height, jib as the main bearing component of railway rescue crane, whose design is reasonable or not, directly affects the performance of the machine lifting.This paper studies large-tonnage (160t) dual rotary railway rescue three section telescopic jib crane based on multiple software. We use OptiStruct software to design the conceptual design topology optimization for the telescopic cross-section, and Workbench to design geometric modeling, finite element analysis and size optimization. The main contents are as follows:(1) This paper describes the research status and development trend of domestic and international rail crane, and introduces several common types of crane-section, it conducts overall design of the telescopic jib and related calculations in terms of the requirements of telescopic jib cranes, to provide the basis of optimization studies.(2) The ideal large telescopic arm of rounded rectangle cross-section can be got through comparative analysis based on Solidworks Modeling, Hypermesh meshing and OptiStruct topology optimization. We use heuristic algorithm to derive topology optimization problems of the minimum flexibility, use volume fraction as a constraint, aim at minimum flexibility, set rectangular cross-section as the original cross, take dangerous section boom instability near half the band established topology optimization model, take topology optimization method based on one by one SIMP. As researches shows:it is the key to set suitable parameter to get the ideal topology results, and it can be found that it is suitable to set volume fractions as0.35and25mm for cell size; obviously, different loading act on different position of the telescopic boom, such as moments mainly act upper and under flange of the boom while axial forces mainly act on annular region of all sides. Rounded rectangle cross-section got by topology optimization can be applied to large tonnage railway crane telescopic jib and it proves that it’s feasible to apply topology optimization to cross section optimization concept design of three section telescopic boom crane, also it provides the new clues for optimization structure design of crane.(3) Using the large rounded rectangular cross-sections as the sectional type arm, with which to design section size, we calculate the load and stiffness when the jibs work in the plane of luffing and rotation, basing on Solidworks modeling for geometric modeling and finite element, we calculate and check the strength,stiffness and overall stability through comparative analysis of the mechanical properties of a large rectangular section with rounded rectangular section under the same conditions. As researches shows:the design of large rounded rectangular cross-sections is reasonable and feasible, and the cross-section is superior to the traditional rectangular cross-section, also it can be optimized further.(4) We set the thickness of the upper and under flange of the jib and web plate as the variable, the maximum stress and the maximum deformation as the constraints; the lightweight design optimization through optimizing the overall quality of the lightest telescoping arm as the goal to optimize. In the process of optimization, we study the influence of the thickness of each section of the arm and lightweight design for sensitivity of the maximum stress and maximum deformation. The thickness of three section telescopic jib is significantly reduced after optimizing and the structure meets the design requirements and achieves a good optimization goal.