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3 Create Entities Using Intergeneration Times

3-4

Specify Intergeneration Times for Entities

In this section...

“Definition of Intergeneration Time” on page 3-4

“Approaches for Determining Intergeneration Time” on page 3-4

“How to Specify a Distribution” on page 3-5

“How to Specify Intergeneration Times from a Signal” on page 3-7

“Using Random Intergeneration Times in a Queuing System” on page 3-8

“Use an Arbitrary Discrete Distribution as Intergeneration Time” on page 3-9

“Use a Step Function as Intergeneration Time” on page 3-10

Definition of Intergeneration Time

The intergeneration time is the time interval between successive entities that the block

generates. For example, if the block generates entities at T = 50, T = 53, T = 60, and T

= 60.1, the corresponding intergeneration times are 3, 7, and 0.1. After each new entity

departs, the block determines the intergeneration time that represents the duration until

the block generates the next entity.

Approaches for Determining Intergeneration Time

You configure the Time-Based Entity Generator block by indicating criteria that it

uses to determine intergeneration times for the entities it creates. You can indicate the

criteria by:

• Specifying a statistical distribution. Upon generating each entity, the block chooses

the time interval until the next entity generation. In a simulation that generates a

large number of entities, the set of intergeneration times follows the distribution you

specify.

• Providing intergeneration times explicitly as values of a signal. Upon generating

each entity, the block reads the value of the input signal. The block uses that value

as the time interval until the next entity generation. The signal can be random or

nonrandom.

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