A lightweight design method for crane metal structures

Abstract

The invention discloses a lightening design method for a crane metal structure. The method comprises the steps of (1) determining a design variable; (2), determining a target function; (3) determining a constraint condition; (4) executing a fruit fly algorithm, wherein the parameter setting is characterized in that the population scale POP_NUM is equal to 100, the maximum iteration number MAX_ITER is equal to 60 and the convergence precision theta is equal to 0.000001. The presentation mode of the fruit fly algorithm for the design variable is changed, the value of the design variable is presented by the summation and extraction of the cubic root of the cube of the distance between the coordinates of a space point to the coordinates of the original point, namely the distance between a fruit fly individual and the original point is approximately simulated by using the formula Si=1 / cube root of(xi<3>+yi<3>), the study and simulation concepts among high organisms are introduced, and the optimal design point in the current population and the random exchange of the design variable values among other points are used to simulate the study process, so the convergence speed of the algorithm is improved, the algorithm can be converged to the global optimal solution with faster speed, and the lightening design method can be directly used for the industrial production without the need of any approximate treatment.

Description

technical field [0001] The invention belongs to the field of mechanical design, and relates to a lightweight design method for a metal structure of mechanical equipment, especially a metal structure of a crane. Background technique [0002] Crane is a kind of large-scale lifting equipment with a wide range of uses. It can not only improve the efficiency of loading and unloading operations, but also reduce the labor intensity of workers. [0003] The metal structure is based on the steel and steel plate rolled from the metal material as the basic components, using riveting, welding, bolting and other connection methods, according to certain structural (not mechanism) composition rules to form a structure that can withstand the load. Metal structure has the characteristics of accurate calculation method, light weight, high degree of manufacturing industrialization, easy installation, and is widely used in construction, bridges, machinery and equipment manufacturing and other i...

AI Technical Summary

Problems solved by technology

However, the traditional optimization design method not only has low optimization efficiency, but sometimes the obtained optimization results are not the optimal calculation results.

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