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SEA TAC example

SEA TAC example. 2 types of customers, coach arrival rate exp m=1min & 1st class arrival rate uniform 4-5min. 1 Q for each class of customer, 1 server for 1st class uniform 5-8 mins, 4 servers for coach, 1@ normal m=15 sd=5, 3@ uniform 5-10 min. How long each type of customer in line.

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SEA TAC example

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  1. SEA TAC example • 2 types of customers, coach arrival rate exp m=1min & 1st class arrival rate uniform 4-5min. 1 Q for each class of customer, 1 server for 1st class uniform 5-8 mins, 4 servers for coach, 1@ normal m=15 sd=5, 3@ uniform 5-10 min. How long each type of customer in line

  2. Chapt 7 (portions) • Read/ Write Nodes (pgs 222-228) • Assembly Modeling (pgs 239-262) • Accumulate Node • Batch/ Unbatch Node • Control Statements

  3. Interface & Assembly • Build on Basic concepts from chapters 5 & 6 • Able to integrate/ interface software with other programs • Provided by reading inputs from files, spreadsheets, databases • Then outputted to files, spreadsheets….. • Able to model the assembly of entities into a single entity ie CPM, collect up to a certain # then release entities • Also retrieve entities that were combined, ie separate parts after they were batched together for a specific process

  4. Read Node • Used to read one or more values from an external file • Table 2.9 Users Guide Node = readin Read from spreadsheet three columns of data 3 branches

  5. Write Node • Used to write values to an external file ie .xls Called sentoxls put in file called airportque.xls send TNOW & ATRIB(2) real values 3 + decimal pt + 1 following

  6. Write Example • Single server to obtain table with 4 columns, entity #, arrival time, wait time, system time

  7. Assembly Modeling • Wait until four units of a order arrive before boxing and shipping • Start an operation that needs one bolt, one washer, one nut, spud wrench • Start activity “pour foundation” once activities of unslab elect, underslab, plumb, gravel & compact are completed • Accumulate • Batch • Unbatch

  8. Accumulate Node • Collect entities until a certain number are reached • When achieved the node is released Save atrib of entity of: SR # til subsequent release # of branches FR # til 1st release

  9. Pert example

  10. Pert example

  11. Batch Node • Collect entities until a certain number are is reached • Then release a single entity that represents the batch • Typically used for modeling pallets and loads of cars/ trucks that accumulate before moving Collecting values on ATRB..then released Batch from when Sorted on /default 1

  12. UnBatch Node • Put entities of a batch back into the network or split an entity into multiple units • Individual entities of the batch are restored

  13. Batch Unbatch example

  14. Batch Unbatch example

  15. Chapt 7 examples • Read example • 7-1 read the following into a model, valuse of ATRIB[0], ATRIB[1] and LTRIB[1] from file ATTRIBUTES.DAT for 1000 entities

  16. Chapt 7 examples • Write example • 7-2 (b) write out the values of current simulated time, the first real attribute, and the first integer attribute of the current entity to the file TRACE.DAT

  17. Chapt 7 examples • 7-9 Use ACCUMULATE to:a) all preceding activities must be completed before a successor can be started, b) any one activity must be completed before a follow one activity can be completed, c) 3 out of 5 activities must be completed before an activity can be completed • a) 3 predecessors

  18. Chapt 7 examples • 7-9 Use ACCUMULATE to: b) any one activity must be completed before a follow one activity can be completed, c) 3 out of 5 activities must be completed before an activity can be completed • b) 1 predecessors Or use

  19. Chapt 7 examples • 7-9 Use ACCUMULATE to:c) 3 out of 5 activities must be completed before an activity can be completed • c) 1 predecessors

  20. Gravel Compact Form U/S plumb Vapor Barrier WWF U/S elect PERT Example • Collect entities until a certain number are is reached • When achieved the node is released • Concrete slab after excavation

  21. PERT Example • Concrete slab after excavation

  22. Control Statements • Class assignment • simulate model shown in figure 7-1 of book • show out put on xls chart • due 11/26

  23. Where are we going • Skip Chapt 8, will do Chapt 9 11/19 • Chapt 10 11/26 • No class 12/3 • Projects due 12/10

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