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  首页《机械工程学报(英文版)》2008年3期目录COMPRESSIBLE VIRTUAL WINDOW ALGORITHM IN PICKING PROCESS CONTROL OF AUTOMATED SORTING SYSTEM

WU Yaohua

ZHANG Yigong

WU Yingying
School of Control Science
and Engineering,
Shandong University,
Jinan 250061, China

 

 

COMPRESSIBLE VIRTUAL WINDOW ALGORITHM IN PICKING PROCESS CONTROL OF AUTOMATED SORTING SYSTEM*

 

Abstract: Compared to fixed virtual window algorithm (FVWA), the dynamic virtual window algorithm (DVWA) determines the length of each virtual container according to the sizes of goods of each order, which saves space of virtual containers and improves the picking efficiency. However, the interval of consecutive goods caused by dispensers on conveyor can not be eliminated by DVWA, which limits a further improvement of picking efficiency. In order to solve this problem, a compressible virtual window algorithm (CVWA) is presented. It not only inherits the merit of DVWA but also compresses the length of virtual containers without congestion of order accumulation by advancing the beginning time of order picking and reasonably coordinating the pace of order accumulation. The simulation result proves that the picking efficiency of automated sorting system is greatly improved by CVWA.

Key words: Virtual window algorithm Dynamics Compressibility Picking efficiency

 


This project is supported by National Natural Science Foundation of China (No. 50175064). Received December 20, 2007; received in revised form April 21, 2008; accepted April 30, 2008

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Biographical notes

WU Yaohua is currently a professor in School of Control Science and Engineering, Shandong University, China. He received his PhD degree from Tsinghua University, Beijing, China, in 1996. He is a vice president in China Society of Logistics (CSL), a director in Chinese Mechanical Engineering Society and a senior member in America Society of Manufacturing Engineers (ASME). His research interests include the designing and simulation for integration logistics system, theories of fast sorting system and logistics equipment, etc.
Tel: +86-531-88392269; E-mail: yaohua.wu@sdu.edu.cn

ZHANG Yigong is currently a PhD candidate in School of Control Science and Engineering, Shandong University, China. His research interests include theories of fast sorting system, layout of distribution center.
Tel: +86-13964118300; E-mail: archer@mail.sdu.edu.cn

WU Yingying is currently a PhD candidate in School of Control Science and Engineering, Shandong University, China. Her research interests include theories of fast sorting system, simulation for logistics system.
Tel: +86-13791008455; E-mail: sophia.wu@blueswords.com


References


[1] ZHANG Yigong, WU Yaohua. Research of efficiency optimization in tobacco automated sorting system[C]//2007 IEEE International Conference on Automation and Logistics, Aug. 2007, Jinan, China. NJ: Institute of Electrical and Electronics Engineers Computer Society, 2007: 1 209–1 213.
[2] HUANG Qiming. The automated sorting system and its application in future [J]. Logistics Technology, 2002, 116(5): 7–8. (in Chinese)
[3] ZHANG Peng, SHEN Minde, FAN Weihua. Design of tower type automatic cigarette picker based on Profibu-DP[J]. Tobacco Science and Technology, 2007, 236(3): 23–24. (in Chinese)
[4] BOZER Yavuz, HSIEH Ying-Jiun. Throughput performance analysis and machine layout for discrete-space closed-loop conveyors[J]. IIE Transactions, 2005, 37(1): 77–90.
[5] BOZER Yavuz, HSIEH Ying-Jiun. Expected waiting times at loading stations in discrete-space closed-loop conveyors[J]. European Journal of Operational Research, 2004,155 (2): 516–532 .
[6] FAN Qiyin, MA Junqi, RAN Wenxue, et al. Application of virtual window algorithm in finished cigarette automated sorting system control[J]. Journal of Kunming University of Science and Technology, 2004, 29(1): 65–68. (in Chinese)
[7] LIU Debao. The research of hybrid tobacco automated sorting system [D]. Jinan: Shandong University, 2006. (in Chinese)


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