SEA TAC example 2 types of customers, coach arrival rate exp m=1min & 1st class arrival rate uniform...
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Transcript of SEA TAC example 2 types of customers, coach arrival rate exp m=1min & 1st class arrival rate uniform...
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
Chapt 7 (portions)
• Read/ Write Nodes (pgs 222-228)
• Assembly Modeling (pgs 239-262)
• Accumulate Node
• Batch/ Unbatch Node
• Control Statements
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
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
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
Write Example
• Single server to obtain table with 4 columns, entity #, arrival time, wait time, system time
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
Accumulate Node
• Collect entities until a certain number are reached• When achieved the node is released
FR # til 1st release
SR # til subsequent release
Save atrib of entity of:
# of branches
• Pert example
• Pert example
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
Batch from when
Collecting values on ATRB..then released
Sorted on /default 1
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
• Batch Unbatch example
• Batch Unbatch example
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
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
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
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
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
PERT Example
• Collect entities until a certain number are is reached• When achieved the node is released• Concrete slab after excavation
Vapor Barrier
Form
WWF
CompactGravel
U/S plumb
U/S elect activity Des Min Mode max
1 Gravel 1 2 32 U/S plumb 2 3 5
3 U/S elect 2 3 54 Compact 2 3 45 Form 3 4 56 WWF 1 2 37 Vapor b 1 2 3
PERT Example
• Concrete slab after excavation
Control Statements
• Class assignment• simulate model shown in figure 7-1 of book• show out put on xls chart• due 11/26
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