Component Detail Include/
exclude
Justification Entities
Agents Quantity: depends on agent type
Include One per system or one per entity/resource
Other: bundling of methods
Include Visually grouping of methods represents (functionality of) agent Docks Quantity: model input Include Model input.
Attribute: (un)loading time
Include Model input. Determines (un)loading time of one pallet Attribute: station type Include Switches dock between loading
and unloading
Attribute: failure EXCLUDE Assumed that loading/unloading never fails or gives delays
Attribute: occupied Include Shows whether dock is scheduled for a job or is currently processing a job
Parking areas Quantity: 3 (AGV, A/D & ET).
Include Responses: A/D parking, Empty Trailer parking and AGV parking utilization
Quantity: depends on input
Include Model input. Number of parking slots per parking area
Tracks Quantity: determined by guide-path design
Include Represents guide-path design
Attribute: length Include Model input
Attribute: curve Include Connects horizontal tracks with vertical tracks
Attribute: direction Include Determines difference between unidirectional and bidirectional tracks
Attribute: capacity EXCLUDE The Conflict Manager should handle collisions/congestion Semi-trailers Quantity: model input Include Model input
Arrival pattern: real life arrivals
EXCLUDE Data not available. Instead include probability density function (e.g. Poisson) Departure pattern: real
life departures
EXCLUDE Data not available. Instead use check whether all cargo assigned to a departing transport has arrived, then depart.
Attribute: consolidation Include Determines how many cargo (e.g. pallets) a semi-trailer contains and where it should go within the cross-dock
Attribute: trailer ID Include Assigns unique ID to semi-trailer Attribute :type of
movement
Include Shows whether semi-trailer is arriving, departing or is moving empty
Attribute: arrival dock Include Shows which unloading dock is assigned to a semi-trailer (uniform distribution)
Attribute: departure dock
Include Shows which loading dock is assigned to a semi-trailer Attribute: Arrival
parking
Include Shows which parking slot is assigned to a semi-trailer when arriving
Attribute: ET parking Include Shows which parking slot is assigned to a semi-trailer at the Empty Trailer parking
Attribute: Departure parking
Include Shows which parking slot is assigned to a semi-trailer when departing
Attribute: routing Include Determines route semi-trailer should take based on parking locations and arrival/departure docks
Attribute: vehicle kinematics
EXCLUDE All semi-trailers are assumed to be the same
Cargo in semi- trailers
Quantity: model input Include Model input. Use a probability density function to determine number of cargo in each trailer and thereby the unloading time Attribute: unloading
dock
Include Shows where cargo is unloaded
Attribute loading dock Include Shows which cross-dock buffer the cargo should be unloaded to Attribute: arriving
trailer
Include Shows in which semi-trailer cargo has arrived
Attribute: departing trailer
Include Shows in which semi-trailer cargo has departed
Garage Quantity: 0 EXCLUDE Maintenance assumed to be handled during system down-time
Activities
Drop-off semi- trailer by Truck
Quantity: number of arriving transports
Include Experimental factor
Pick-up at Arrival/Departure Parking
Quantity: number of arriving transports
Include Experimental factor
Drop-off at Arrival/Departure Parking
Quantity: number of departing transports
Include Experimental factor
Rearward docking/parking
Cycle time: fixed Include Depends on rearward driving speed, model input.
Routing: end of cross- road
Include AGV or AGV+semi-trailer stops at end of the cross-road and then backs up.
Breakdown EXCLUDE Assumed that docking or parking semi-trailer never fails
Other: AGV load- specific
EXCLUDE No difference between rearward driving time whether AGV is loaded with semi-trailer or not Empty trailer
movements between cross- dock and Empty Trailer Parking
Quantity: 2 per trailer Include From cross-dock to ET when finished unloading and from ET to cross-dock when ready for departure
(De)coupling between AGV and semi-trailer
Cycle time: fixed Include Model input
Loading/unloading semi-trailer
Quantity: depends on cargo in semi-trailer
Include Key influence on throughput, experimental factor
AGV Charging Cycle time: variable Include Depends on model input (continuous charging, battery swaps or conventional charging) Breakdown EXCLUDE AGV charging never fails Set-up: depends on
model input
Include AGV charging is replaced with a set-up/changeover when battery swaps are used
Resources: charging facility
Include Located at AGV parking area.
Conflict/collision avoidance
Include Facilitates real-life representation of system
Pick-up semi- trailer by truck
Include Key influence on parking area utilization
Internal cross- dock operations
EXCLUDE Limited impact on throughput of AGVs, assumed to have no impact on (un)loading operations
Queues Cross-dock queues
Quantity: same as number of docks
Include Temporarily stores cargo
Capacity EXCLUDE Assumed to be infinite
Queue discipline EXCLUDE Does not affect loading/unloading times
Routing: cargo attribute dependent
Include Determines where cargo should be stores based on departure dock attribute of cargo.
Resources
Trucks Quantity: total of arriving and departing transports
Include Required for transporting semi- trailers
Where required: drop- off and pick-up semi- trailer at A/D parking
Include Required for positioning semi- trailer at terminal and to free up space at parking when departing transports arrives at A/D parking Shifts: 24 hours, 6
days a week
AGVs Quantity: variable Include Experimental factor. Where required: any
activity involving semi- trailer movement within system boundary
Include Key influence on semi-trailer throughput
Shifts: 24 hours, 6 days a week
Include Model input
AGV charging equipment
Quantity: same as number of AGVS
Include Experimental factor
Where required: any activity related to charging AGVs
Include Enables charging of AGVs
Other: charging type Include Experimental factor (continues charging, battery swaps or conventional charging) Personnel in
cross-dock
Quantity EXCLUDE Assumed to be always available
Handling equipment in cross-dock