fabrication & material flow transportation models · 2020. 10. 6. · ©2018 lockheed martin...
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LOCKHEED MARTIN PROPRIETARY INFORMATION
FABRICATION & MATERIAL FLOW TRANSPORTATION MODELSPittsburgh, PA
May 7, 2018
Simulation Modeling with Simio at Lockheed Martin Aeronautics
Lauren Gibbens and Ryan Skinner
Industrial Engineering Systems
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2©2018 Lockheed Martin Corporation
Overview
F-35 JOINT STRIKE FIGHTER U-2 DRAGON LADYSR-71 BLACKBIRDF-117 NIGHT HAWKC-130 HERCULES
F-16 FALCON F-22 RAPTOR
One of the world’s leading defense contractors
Current largest contract is the F-35 Joint Strike Fighter• 5th generation, multi-role stealth fighter
• CTOL, STOVL, and CV
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3©2018 Lockheed Martin Corporation
Modeling Challenges
• Very fluid production line• Increasing rate (low rate to full-rate)
• Changing factory configurations as capacity increases
• Production line never truly reaches steady-state before the next configuration is introduced
• As production flow changes, the cadence, work schedules, and manpower requirements change, each reflected in an analysis.
• 3 different aircraft designs flowing through same production line
• Performance of the system over the entire simulation does not fully capture the performance of the system over time. • Time-phased statistics at pre-defined periods of time
• Allows us to assess the system as the configuration, work schedules, and cadence changes.
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4©2018 Lockheed Martin Corporation
Littles Law
Flow Time = WIP / Throughput
Theory of Constraints
Fabrication: Mixed model shared resource environment
• Manage the Bottleneck: Capacity analysis
• Incorporate process improvements for increased throughput
• Induction Methodology: Reduce flow time
• How/When you induct work into the system can have a large impact on flow time
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5©2018 Lockheed Martin Corporation
Fabrication
Objective: Provide a model to experiment with capacity and throughput; incorporating different induction methodologies and deployment of resources to meet increasing demand.
Scope:• Large number of parts
• Complex routing logic
• Labor distributions for every step of the process
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6©2018 Lockheed Martin Corporation
Model Parameters
• Resource Allocation• Incorporate staffing by shift
• Resource pools based on shared skillsets
• Maximum capacity of each area
• Induction Methodology• First In First Out (FIFO)
• Prioritize based on schedule finish date
• Weighted server
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7©2018 Lockheed Martin Corporation
Model allows virtual experimentation and adjustments to the plan prior to deployment
Material Flow Transportation Model
Objective: Identify high-congestion areas along the main aisle and help solidify the delivery plan for all materials to the floor at full rate
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8©2018 Lockheed Martin Corporation
Object: Conveyance
Attributes: Length:Delivery Location:Due Date:Standard Delivery:
Object: Vehicle
Attributes: Speed:Maximum Length:Delivery State:Delivery Route:
Carried by:
Object: Position Node
Attributes: Late Tally:On-time Tally:Delivery Expression:Delivers to:
Object: Consumable Delivery Train
Attributes: Speed:Delivery Cycle:Delivery Locations:Probability of Delivery:
Delivers to:
Aircraft Position Model
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9©2018 Lockheed Martin Corporation
Object: Build Area Model
Attributes Tally StatisticsDelivery CyclesA/C Move Times
Reports toReports to
Build Area Model
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10©2018 Lockheed Martin Corporation
Is Vehicle Type Vehicle in Pickup StatePickup Empty ConveyancesY Y
Is Conveyance Type
N
Standard Delivery?Y Move to Staged Queue
Non-Standard Delivery Process
Y
N
Move to In Work Queue
Move to Pickup Queue & Call for Pickup
Is Consumable Type
N
Consumable have delivery @ Node?
Unload Consumable DeliveryY
Unload Consumable DeliveryN
Node – Vehicle Interaction
Node – Conveyance Interaction
Node – Consumable Interaction
Delivery Node Sub-Model
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11©2018 Lockheed Martin Corporation
Advantages of Simio Objects
Modeling object interactions within Simio provides several advantages:• Better model scalability: Quickly create new instances of objects and the
behavior remains consistent
• Quickly add positions / entire build areas by creating new object instances
• Flexible model changes: Any change to the object definition is reflected in all object instances
• Any changes to the object definitions are reflected across all object instances. Reduced change roll-out time
• More structured & systematic model development:
• Object Oriented modeling provides a structured development approach.
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