Optimum Design Of Compensating Pulley Method Based On Particle Swarm Optimizer

The partially slewing crane is a kind of representative rotary rail crane, which is also the first developed type in our country. Besides the design of luffer is an important constituent part during the structure design of portal crane. The quality of its design will directly affect the economy, reliability and serviceability of the whole crane.The paper studies compensating pulley luffing system of portal crane. By taking luffing trace difference between horizontal lines as primary optimization object. In other words, let the load move along a level line when luffing. Because on the process of work luffing, the load could be moved along a level line to save the driving power, a mathematical model of the luffer is established. Besides, the luffer system of partially slewing crane with single-beam uses luffing screw to finish the luffing process. So the position of luffing screw will impact the force condition of luffing screw. In this paper, another optimization subject is the position of luffing screw. Through compare several results of different objective function, determine the finial optimization objective function, that is, minimum equivalent force of the luffing screw. Through the program which compiled, which can got the dimensions of every part of the arm system and the length and position of luffing screw. Make the luffing system achieve the best effect.A Particle Swarm Optimizer (PSO) is provided to solve the mathematical model which mentioned above in this paper, which has a better performance than the classical methods to avoid trapping in locally optimal solution. Because the PSO generated only for several years, so the application of the algorithm on engineering is less relatively. In this paper, use the PSO to solve an engineering problem and achieve a satisfying result.A reliable CAD program of optimized design is also developed using Visual Basic 6.0 program language and a concise and friendly interface offers to the designer. This program can also save a lot of time for the design of the luffing system. Finally, the operating methods of the software are presented by the discussion of a practice example, which verifies the practicability of the software, too.