Optimization Design For Luffing Mechanism Of The Brachial-Bridge Portal Container Crane

There are two main kinds of port container cranes: the bridge crane and the brachial crane. The bridge crane has high efficiency on loading and unloading containers, it has a large working range as well. The brachial crane has lower efficiency and smaller working range than the bridge crane. But the bridge crane is much more expensive to manufacture and maintain than the brachial crane. The new type of crane-the briachial-bridge crane, which combines the advantages of the two types of container cranes, has high efficiency on loading and unloading containers and large working range. So this new kind of container crane has good superiority. And the briachial-bridge luffing mechanism includes the core technology of the crane. The result of the mechanism directly effect the result of the whole crane directly and remarkable. So it is necessary to optimize the luffing mechanism seriously.Sequential Unconstrained Minimization Technique is an indirect optimization method. The main idea of this method is to transfer an optimization problem which has constraints into an optimization problem without constraints by adding the constraints to the end of the optimization problem in a certain rule. Then we can use the usual technique which can only solve the optimization problem without constraints to solve the optimization problem with constraints. If the additional items accord with the constraints, the additional items are useless, or they would be "punished" and affect the result of the problem.In this paper, the optimization of the luffing system of the brachial-bridge portal container crane with combined compensating pulley is studied. Combining the design of portal crane luffing mechanism, this paper sets up the math model of the luffing system of the brachial-bridge container crane with combined compensating pulley. This paper analyses the main factors which has the prominent influence on the horizon of the container, discusses the changing direction and orderliness of the influence by the factor and researches the influence to the compensating effect by moving the pulley block. According to the idiographic math model of the brachial-bridge luffing system and the applying range and specialty of many kinds of optimization methods, decides touse Sequential Unconstrained Minimization Technique to optimize the model. Combining with the visual integration explode environment of Delphi language, compiles the feasible optimization design and inspection program. The program has friendly interface and easy to modify. The user of the program can repeatedly optimize and inspect the problem conveniently and rapidly. There are three main fruit of the paper as follows:1. For the first time, combining with the luffing mechanism of the new type of brachial-bridge container portal crane, achieves the optimization of the combined compensating pulley system. And the paper supplies a right and efficient design theory and method for the design and inspection of the luffing mechanism of the crane.2. According to the theory and character of the combined compensating pulley system, confirms the constants and the variables of the math model. This makes the math model more precise and perfect. The experiment data prove that the main factors do have the influence on the horizon of the container and show the changing direction and orderliness of the influence by the factors. This paper confers and validates through the experiment data that it has no influence to the compensating effect by moving the pulley block.3. According to the idiographic math model of the brachial-bridge luffing system, use Sequential Unconstrained Minimization Technique to optimize the model. Use Delphi language to compile the feasible optimization design and inspection program. This program supplies an efficient and feasible tool for the optimization design of the luffing mechanism of the brachial-bridge crane.