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ARENA simulation software

K.MAHESWARA RAO

09MF05M.E(I.E)

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Ways To Study AWays To Study A

SystemSystem**

*Simulat

ion, Modeling & Analysis (3/e) by Law and Kelton, 2000, p. 4, Figure 1.1

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Technical Attractions ofTechnical Attractions of

SimulationSimulation**

Ability to compress time, expand time

Ability to control sources of variation

Avoids errors in measurement

Ability to stop and review Ability to restore system state

Facilitates replication

*

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Introduction

With Arena, you can:

Model your processes to define, document, andcommunicate.

Simulate the future performance of your system to

understandcomplex relationships and identify opportunities forimprovement.

Visualize your operations with dynamic animationgraphics.

Analyze how your system will perform in its as-isconfiguration

and under a myriad of possible to-be alternativesso that you

can confidently choose the best way to run your

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Entities are dynamic elements that pass through the

system.

Entities are distinguished by theirattributes.

Attributes must benumerical values.

You may have different types of entities in the same model.

Resources have a name and a capacity (number of

identical units of the resource).

Resources may have a schedule (how many of them are

available and when).

Variables can be referenced in modules, can be

reassigned a new value with a particular module, and can

be used in any expression

Time Attribute Variables, Cost Attribute Variables

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The Arena modelling environment

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Flowchart and SpreadsheetViews

Model window split into two views Flowchartview Graphics

Process flowchart

Animation, drawing

Edit things by double-clicking on them, get into adialog

Spreadsheetview Displays model data directly

Can edit, add, delete data in spreadsheet view

Displays all similar kinds of modeling elements

at once Many model parameters can be edited in either

view

Horizontal splitter bar to apportion the twoviews

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The Project Bar hosts panels with the primary types ofobjects that you will workwith: Basic Process panel: Contain the modelling shapes,

called modules, that youll use to define your process. Reports panel: Contains the reports that are availablefor displaying results of simulation runs. Navigate panel: Allows you to display different views ofyour model, including navigating through hierarchical submodels and displaying a model thumbnail.

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Create

Well start the flowchart using a Create module, from the

Basic Process panel. This is the starting point for the flow ofentities through the model.1.Drag the Create module from the Basic Process panel intothe model

window. A default name, Create 1, is given to the

module when its placed.

Every process flow starts with a Create module. When yousimulate the flowchart, individual entities will be createdaccording to timing information you supply in the Createmodule properties. After itscreated, each entity moves from the Create module to thenext shape inthe process flow

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Process the applicationsNext in our flowchart is a Process module that represents theReview Application step.1. Be sure that the Create module is selected so that Arena

will automatically connect the Process to the Create module.2. Drag a Process module from the Basic Process panel intothe model window, placing it to the right of the Create. Arenawill automatically connect the two modules.

If no connection appears between Create and Process, clickthe Object > Connect menu item or the Connect toolbarbutton to draw a connection

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Dispose the applications to terminate the process

Next well place the Dispose module that represents acceptedapplications, connecting to the True (right) output from the Decide

shape. Then, well complete the flowchart with another Dispose forreturned applications.

1.Select the Decide shape so that our first Dispose will beconnected automatically2.Drag a Dispose module to the right of the Decide module. Arenawill connect it

to the primary (True) exit point of the Decide module.3.To add the second Dispose module, once again select the Decidemodule, so

that Arena will automatically connect its False exit point to the

new Dispose module,

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Dispose Module

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Basic ArenaBasic ArenaSimulationsSimulations

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Create Module

double-click

drag & drop

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Delay Process

delay for processing time

holds entity in this

module for some period

of time

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Processes RequiringResources

seize resourcedelay for processing time

release resource

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Decisions

right-click here to bring

up expression builder

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Connecting Modules

Object Connect

then select output of one module

and input of next module

(watch for green & red boxes on

terminals)

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Entities

double-click

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Resources

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Resource Animation

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Simulation Run Setup

Run Setup

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Dynamic Plots

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Complete Simulation

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Arena Tutorial 3 - ElectronicAssembly Process - 1

Arena Tutorial 3

Electronic AssemblyProcess - Part 1

Technology

Forge

Version1.0

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Tutorial Objectives:

Create a basic model of an electronic assemblyprocess.

Use an Assign module to assign different delay times fordifferent assemblies.

Use Record modules to create new measures of systemperformance.

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Metalcase

Circuitboard

Sealant

Metalcase

Metal casecomes in 2versions:

Part A and PartB

Top andbottom casepieces areidentical.

Electronic

Assembl

yExample

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Process

we will besimulatin

gContextDiagram

for thisExam le

Electronic

Assembly

Part ACase Supplier

Part BCase Supplier

Ship

Scrap

Salvage

Part A

Part B

Goodassembly

Salvaged

assembly

Scrapassembly

Circuit Board

Supplier

Circuit

board

Store Room

SealantCase

Case

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Simulation goals are to collect statistics on:

Resource utilization for each resource Whatpercent of the available work time is each resourcein the process busy?

Number of units in queue at each operation How many units are waiting to be worked on ateach operation?

Time in queue at each operation How longdoes each unit wait to get worked on?

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Do not includecircuit boardsand sealant in

this model

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36

Basic Model

Desired statisticsfor each processmodule:

- Resource

utilization- Units in queue- Time in queue

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Do thesenext

ConfigureCreate

Modules

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ConfigureFinish Part A

Surfaces

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Next

ConfigureFinish Part B

Surfaces

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We will returnto this modulelater to specify

Delay Type

Start configuringthe

Seal Assembly

module

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ConfigureRework Seal

module

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Tutorial Objectives:

Create a basic model of an electronic assembly process.

Use an Assign module to assign different delaytimes for different assemblies.

Use Record modules to create new measures of system

performance.

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Part A andPart B have

differentdelay times

Finish configuringthe

Seal Assembly

module

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Startconfiguring theAssign module

for Part A

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Assign module

for Part A

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Startconfiguring theAssign module

for Part B

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Assign module

for Part B

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0

0.05

0.1

0.15

0.2

0.25

0 2 4 6 8 10 12

Probability

Sealer Time (minutes)

Weibull distributionof Sealer Times

( ) ( ) /1)( xexxf =

=2.5

=5.3

x

Timebetwee

narrivals

Probability ofnext part arrivingx minutes afterprevious part

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Finish configuringthe Seal Assembly

module

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- Resourceutilization

- Units in queue- Time in queue

Runsimulation!

R i

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- Resource

utilization- Units in queue- Time in queue

Reviewresults

R i

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- Resource

utilization- Units in

queue- Time in

queue

Reviewresults

Ch

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Changepictures for

Part A and Part

B

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Animateresources

rena Symbol Factory

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rena Symbol Factory

Arena .plb picture files

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Animatedmodel

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Simulation goals are to collect statistics on:

Resource utilization for each resource What percent of theavailable work time is each resource in the process busy?

Number of units in queue at each operation How manyunits are waiting to be worked on at each operation?

Time in queue at each operation How long does each unitwait to get worked on?

Cycle time How long does each part take to get throughthe entire system?

Good assembly cycle time, Salvaged assembly cycle time, Scrap assembly cycle time.

Addcycle timestatistics

Cycle time:

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Cycle time:How long does each part take to get through the entire

system? Good assembly cycle time,

Salvaged assembly cycle time, Scrap assembly cycle time.

How doesthis split

out?

Add

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Addcycletime

recorders

F

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Configurethe

Record

modules

The other Recordmodules areconfiguredsimilarly

From afew slides

ago

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Cycle timesfor

assemblies

Overview

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Overviewthe basic process of contact center simulation is to generate a stream

of arriving contacts,assign them to trunk lines, and route them through the center to an

agent. To create a simulation model of a contact center or network ofcontact centers, you will describe thesequence of events that occur as contacts move through the system,from the arrival of the contacts at the contact center to successfulresolution. You will also need to specify information about the contactcenter itself (trunk-line capacity, agent skills, agent schedules,etc.).

As you build your contact center models, it maybe helpful to keep in mind the Contact Center Core Process, asillustrated below.

The basic components of this processare:1.Contacts2.Arrival Patterns3.Trunk Groups

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