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Chapter 4 Modeling Basic Operations & Inputs. Outline. detailed operations Model 04-01 Model 04-02 Model 04-03 Model 04-04 general usage of ARENA. A Sequence of Related Models. Model 4-1: a sealed electronic assembly and test system more features,

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Chapter 4 Modeling Basic Operations & Inputs

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Chapter 4 modeling basic operations inputs

Chapter 4

Modeling Basic Operations & Inputs


Outline

Outline

  • detailed operations

    • Model 04-01

    • Model 04-02

    • Model 04-03

    • Model 04-04

  • general usage of ARENA


A sequence of related models

A Sequence of Related Models

  • Model 4-1: a sealed electronic assembly and test system

    • more features,

  • Model 4-2: additional features in scheduling, failure, and states of resources

  • Model 4-3: more advanced animation

  • Model 4-4: advanced features in moving – stations, routes, and animation


An electronic assembly test system

Part A

Process A

EXPO(5)

Tria(1,4,8)

Rework

9%

91%

Process B

Shipped

Tria(3,5,10)

Part B

Batches of 4 EXPO(30), de-batch on arrival

An Electronic Assembly/Test System

Scrapped

Part A TRIA(1,3,4)

Part B WEIB (2.5, 5.3)

20%

80%

EXPO(45)

Salvaged & Shipped

Sealer


An electronic assembly test system1

Part A

Scrapped

Part A TRIA(1,3,4)

Part B WEIB (2.5, 5.3)

Process A

20%

EXPO(5)

Tria(1,4,8)

80%

Rework

EXPO(45)

Salvaged & Shipped

Sealer

9%

91%

Process B

Shipped

Tria(3,5,10)

processes

Part B

create batches of 4 entities & de-batch later

chance

create entities

statistics

Batches of 4 EXPO(30), de-batch on arrival

unreliable system

type-dependent service times

An Electronic Assembly/Test System

An Electronic Assembly/Test System

to determine the number of racks


Model 04 01

Model 04-01

  • ignore details

    • the 2-minute traveling times

    • the working hours of stations

    • schedule of the re-workers

    • failure of the sealer

    • the number of racks used


Remarks for model 04 01

Remarks for Model 04-01

  • two types of entities

  • entity-dependent service time: an attributes of an entity: a local variable of the entity

  • time in system: marking the time entering the system

  • chance: conditional routes

  • type dependent statistics: record mechanism


Chapter 4 modeling basic operations inputs

Model 04.02


New features of model 04 02 refinements of model 04 01

New Features of Model 04-02: Refinements of Model 04-01

  • run length 10 days, 16 hours per day

  • two 8 hr shifts / day

    • 1 re-worker in the first shift

    • 2 re-workers in the second shift

  • sealer may break down

    • life time expo(120)

    • repair time expo(4)

  • statistics of the status of sealer: on and off

  • statistics of the rework queue (distribution of # of racks)

    • each rack possible to hold 10 items


Schedule of the rework station

Schedule of the Rework Station

  • run length: Setup menu

  • variable resource

    • define schedule of re-workers (Schedule module)

      • modify the # of hours per day to suit the schedule

    • associate the schedule with the (resource of the) re-work station

      • option on resource when a service is interrupted: ignore, wait, preempt


Failure of resource

Failure of Resource

  • failure of the sealer

    • define a failure (Failuremodule in Advanced Processes)

    • associate the failure with a resource

    • the treatment of incomplete work at a failure

      • same as schedule: ignore, wait, and preempt


Collect statistics

Collect Statistics

  • statistics

    • time in system: customer average

    • sealer: state dependent, time average

    • rack: number of rack needed, time average


Collect statistics1

Collect Statistics

  • to get time-in-system statistics of a type of entities (customer-average statistics)

    • use Record module

    • record exit time - creation time

    • compile statistics

  • to get time-persistent statisticsof a collection of values of variables or a collection of states of resources

    • use Statisticsmodule (in Advance Process Template)

    • may need to self-define categories


Statistics for racks and for sealers

Statistics for Racks and for Sealers

  • time-persistent statistics –Statistic module

  • statistics on sealer status

    • fraction of idle, failed, and busy time of sealer

    • statistic type: frequency (not time-persistent)

  • statistics on number of racks needed

    • fractions of time for different number of racks used

    • statistic type: frequency (not time-persistent)


Instantaneous utilization and scheduled utilization

Instantaneous Utilization and Scheduled Utilization

  • for a resource, let

    • B(t) = # of units of the resource busy at t

    • M(t) = # of units of the resource available at t

  • instantaneous utilization

  • scheduled utilization


Chapter 4 modeling basic operations inputs

Model 04.03


New features of model 04 03 refinements of model 04 02

New Features of Model 04-03: Refinements of Model 04-02

  • animation of queues

    • length and points of queues

  • changing entity pictures

    • creating new one: copy, edit, and assign entity picture

  • adding resource pictures

    • creating resource picture from animation tool bar

  • adding variable plots


Chapter 4 modeling basic operations inputs

Model 04.04


New features of model 04 04 refinements of model 04 03

New Features of Model 04-04: Refinements of Model 04-03

  • saving connection links by station and route modules

    • stations: module for program and icon for animation

    • route: module for program and link for animation

    • possible to have multiple station icons in animation for one location

    • two station icons between one route link in animation

  • changing an entity picture: by an Assignment Module


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