The Structure Design Of Aerial Ladder Move Trunk And Optimition Of Ladder System

With the acceleration of the urbanization in China, the demand for aerial ladder move trunk is increasing in the construction of new building and reconstruction of old building.However, aerial ladder rely much on imports due to backward technology. To solve this situation, this paper designed a aerial ladder move trunk, then conducted a finite analysis and optimization on the aerial ladder.Firstly, the whole design scheme of aerial ladder move trunk worked out based on the design index, then the design of chassis, revolution structure, hydraulic hitch legs and aerial ladder was made.The virtual prototype of aerial move trunk was built finally.Considering that the strength and stiffness of aerial ladder concerns the property and personal security, this paper built the finite element model of the ladder system firstly, and then analyzed the work load and condition to find the dangerous conditions. Then the static characters were analyzed under two kinds of dangerous conditions using software ANSYS Workbench. The maximum stress of each ladder and the maximum deformation of total aerial ladders were found to evaluate the strength and stiffness of aerial ladder. Then dynamic characteristics were analyzed and the first eight modal frequencies and mode shapes were found via constrained modal analysis.According to the result of static structural analysis, an optimization based on parametic model to the second and third ladders was conducted to reduce the weight of ladders with joint simulation of Pro/E and ANSYS Workbench. As the first step of surface response optimization, the design points were created for experiment and then response surface was obtained based on the experiment data. Optimization scheme made out via genetic algorithm. The result shows that the effect of lighten weight is obvious.This paper not only provides reference and basis for the design and manufacture of aerial ladder move trunk, but also has a great significance for the analysis and optimization of same ladder structures.