ارايه الگوريتمي براي مسيله برش دوبعدي با تقاضا

An Algorithm for Two Dimensional Cutting Stock Problems with Demand

In this paper two-dimensional cutting stock problem with demand has been studied In this problem, cutting of large rectangular sheets in to specific small pieces, should be carried out, hence for the waste will be minimized Solving this problem is important to decrease waste materials in any industry that requires cutting of sheets. In most of the papers the demand of pieces has not been usually considered. The cutting problems belong to Np-hard problems. So finding a desirable solution in a suitable time is practically impossible and heuristic methods must be used.A meta heuristic algorithm using SA approach is presented Then attempts have been made to regulate the SAs parameters. Initial solutions are produced with a rule based algorithm and two internal and main SAs are used that lead to better performance of the algorithm. Due to lark of benchmark or test problems, two procedures for generating random problems is presented and are used to study efficiency of the algorithm. For this purpose, problems about 10 to 50 types of pieces with maximum demands of 2400 are generated and solved using the proposed algorithm. The results indicate that the algorithm capable offending a solution with less than 6% of waste for problems with 30 types of pieces and total demands of 500.