異形高聳專用塔機(jī)動(dòng)載響應(yīng)分析及多目標(biāo)優(yōu)化
[Abstract]:Special-shaped towering tower crane is a new type of lifting and lifting comprehensive equipment designed and trial-produced by the Research Institute of Building Mechanization of the Chinese Academy of Architectural Sciences. The main construction object is the cooling tower of thermal power plant, highway cable tower, chimney and other buildings with large vertical height and irregular shape, which is used to solve the problems of low utilization ratio of equipment and limitation of working radius of common tower crane in this kind of building construction. Because the standard of tower body of the new structure saves the end face inclined web bar, and the climbing of the construction flat bridge will make the upwind area of the whole machine become very large, this makes the tower crane easily cause larger shock vibration under the action of transient force and affect the working stability. In this paper, the structural response and stability under complex dynamic loads are taken as the main research contents, and the finite element analysis and optimization design of the special-shaped tower crane are carried out. Based on the analysis of the main structure and function characteristics of the special-shaped towering tower crane, the parameterized modeling of metal structure was carried out by using APDL language. Based on this model, the static analysis of special-shaped tower crane under unfavorable working conditions is carried out, and the modal analysis and harmonic response analysis are completed at the same time. According to the fluctuating components of wind load, the linear filtering method is used to simulate the wind speed time history at different heights, and the results are introduced into ANSYS for transient dynamic analysis. The vibration effect and the influence on the strength and stability of tower crane were investigated. In addition, the lattice structure of the tower is equivalent to the full-web structure by the method of equivalent moment of inertia, and the buckling critical load at different heights of the tower is calculated and compared with the results obtained by ANSYS nonlinear analysis. A more reliable limit load value of special-shaped tower crane is obtained. The optimization platform of I SIGHT and ANSYS is constructed with the maximum key mode frequency, the smallest dynamic load coefficient and the lightest mass as the design goal. Through the sensitivity analysis in ANSYS, the structural parameters with large response value are determined as design variables. In the optimization process, the non-dominated sorting genetic algorithm (NSGA-II) is used to obtain the Pareto noninferior solution set. The optimization results reflect the relationship between the optimization objectives and provide a reference for the design of crane metal structures with excellent static and dynamic performance.
【學(xué)位授予單位】:西安建筑科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TH213.3
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