Fleet sizing of laser guided vehicles and pallet shuttles in automated warehouses

The paper deals with emerging automation technologies for pallet handling in warehouses characterized by multiple-depth rack storage systems. In particular, this study addresses the adoption of Pallet Shuttles (PSs) for material handling within the rack structure, i.e., for put-away and retrieval operations from the rack face to the specific pallet location and vice versa. PSs are used in combination with Laser Guided Vehicles (LGVs) so as to obtain a fully automated warehousing system. The study develops an analytical model for the joint LGV–PS fleet sizing problem, also taking into consideration stochastic phenomena and queueing implications. This enables the analyst to compute the utilization of LGVs and PSs as a function of sizes of the two fleets. Then, a queueing model can be applied to estimate the cycle time of the orders in the warehousing system. An example to clarify the application of the method is also provided.

[1]  Robert W. Grubbström,et al.  The moments and central moments of a compound distribution , 2006, Eur. J. Oper. Res..

[2]  Bianca Rimini,et al.  Efficiency estimation of LIFO storage systems managed with automated guided vehicles (AGVs) , 2011 .

[3]  Dima Nazzal,et al.  A closed queueing network approach to analyzing multi-vehicle material handling systems , 2011 .

[4]  Reza Zanjirani Farahani,et al.  An integrated approach to determine the block layout, AGV flow path and the location of pick-up/delivery points in single-loop systems , 2009 .

[5]  Xiaolei Huang,et al.  Fleet sizing of automated guided vehicles: a linear programming approach based on closed queuing networks , 2012 .

[6]  Pius J. Egbelu,et al.  Determination of vehicle requirements in automated guided vehicle systems: A statistical approach , 2000 .

[7]  George P. Cosmetatos.  Some practical considerations on multi-server queues with multiple poisson arrivals , 1978 .

[8]  Min Zhang,et al.  Modeling of Workflow Congestion and Optimization of Flow Routing in a Manufacturing/Warehouse Facility , 2009, Manag. Sci..

[9]  Teo Chung-Piaw,et al.  Cyclic deadlock prediction and avoidance for zone-controlled AGV system , 2003 .

[10]  Marc Goetschalckx,et al.  Research on warehouse design and performance evaluation: A comprehensive review , 2010, Eur. J. Oper. Res..

[11]  Kap Hwan Kim,et al.  Positioning of automated guided vehicles in a loop layout to minimize the mean vehicle response time , 1995 .

[12]  Cristian Secchi,et al.  An efficient control strategy for the traffic coordination of AGVs , 2011, 2011 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[13]  Cristian Secchi,et al.  Coordination of industrial AGVs , 2011 .

[14]  Ronald Mantel,et al.  Design and operational control of an AGV system , 1995 .

[15]  Leon F. McGinnis,et al.  Throughput performance analysis for closed-loop vehicle-based material handling systems , 2008 .

[16]  Iris F. A. Vis,et al.  Survey of research in the design and control of automated guided vehicle systems , 2006, Eur. J. Oper. Res..

[17]  Marc Goetschalckx,et al.  Research on warehouse operation: A comprehensive review , 2007, Eur. J. Oper. Res..