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Volume 64, Issue 617
Displaying 51-54 of 54 articles from this issue
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Kikuo FUJITA, Shinsuke AKAGI, Noriyasu HIROKAWA, Kiyotaka YOSHIDA1998 Volume 64 Issue 617 Pages 354-361
Published: January 25, 1998
Released on J-STAGE: February 26, 2008
JOURNAL FREE ACCESSAn optimization method for the planning problem of energy plant configurations is proposed based on genetic algorithms. In such a planning problem, a plant configuration, i.e., types, models, and numbers of equipment, is determined so as to satisfy required energy damand conditions and to minimize the sum of plant facility cost and input energy cost. This is a combinatorial optimization problem similar to the knapsack problem, which is hard to find an optimal configuration due to the huge number of alternatives. In this paper, we apply a genetic algorithm to such an optimal planning problem by representing a plant configuration with bit vectors and by arranging cost functions so as to keep search performance superior against the deceptive problem. Its optimization performance is demonstrated by computational examples of a cogeneration plant and comparison results with a random search and a simulated annealing method.View full abstractDownload PDF (911K) -
Weerapat SESSOMBOON, Hiroyuki MURAMATSU, Takashi IROHARA, Kazuho YOSHI ...1998 Volume 64 Issue 617 Pages 362-369
Published: January 25, 1998
Released on J-STAGE: February 26, 2008
JOURNAL FREE ACCESSIn this paper, we address the issue of a cellular munufacturing system layout design, which, in essence, consists of two main problems, cell formation and cell layout, While a number of studies have been conducted on this issue, the two problems were usually considered sequentially, and the impact of cell layout was ignored when solving cell formation. Moreover, it was often assumed that all cells are equal in area and shape, which is not practical for industry-scaled problems. We propose an integrated approach using the Genetic Algorithm (GA) to solve the problems simultaneously, with an assumption that not all cell areas and shapes are equal. Our numerical experiments and results show that our method performs better compared to a conventional method in which cell formation and cell layout are considered sequentially.View full abstractDownload PDF (759K) -
Weerapat SESSOMBOON, Makoto SUGIYAMA, Takashi IROHARA, Kazuho YOSHIMOT ...1998 Volume 64 Issue 617 Pages 370-376
Published: January 25, 1998
Released on J-STAGE: February 26, 2008
JOURNAL FREE ACCESSAutomated Guided Vehicle systems (AGVs) are important in modern manufacturing systems. One of the important issues in the design of AGVs is to determine the direction of AGV, which is known as AGV flow path design problem. Though a number of significant research has been conducted on this problem, most of them do not take into consideration the effect of machine layout when designing AGV flow path. In this paper, an integrated technique employing Genetic Algorithm (GA) and Simulated Annealing (SA) to solve AGV flow path design problem is proposed. GA is used to search for AGV flow path direction, while SA is simultaneously used to search for machine layout.View full abstractDownload PDF (781K) -
Hiizu OCHI, Koichi OGAWA, Yoshiaki YAMAMOTO, Yasuo SUGA1998 Volume 64 Issue 617 Pages 377-380
Published: January 25, 1998
Released on J-STAGE: February 26, 2008
JOURNAL FREE ACCESSFriction welding of 6061 aluminum alloy to steels was conducted, the effects of welding conditions and various heat treatments of the welded joint on the joint strength were examined. Under the same welding conditions, the tensile strength of A6061/steeI joints were much alike for all the steels used. Tensile strength was seen to increase when the upset pressure was raised. In the case of joints welded at upset pressure not less than 80MPa, tensile fracture occurred in thermal softened A6061 area and the tensile fracture surface approached closer to the weld interface according to increases in the upset pressure, because softened A6061 was exhausted with burr under the action of upset pressure. It was concluded that joint strength depends on the width of the softened A6061 area. The whole A6061 area of T62 heat treated joint hardened to the same extent as the received material of A6061-T6, and tensile strength of this joint was high compared with that of the weld joint.View full abstractDownload PDF (648K)