 
Summary: ENES489P Simple Exercise 09/02/2010
Introduction to Simulink
Please complete the tutorial on Simulink found at
http://www.mathworks.com/access/helpdesk/help/pdf doc/simulink/sl gs.pdf
. This will familiarize you with the basic operation of Simulink.
Introduction
The field of systems engineering is undergoing continuous advancement in the direction of doing more at the systems
engineering level. One popular trend is that of model based engineering, where rather than building the actual system,
a computer model of the system is built instead and properties of this model are checked against the requirements.
Simulink is a modelbased design tool dynamic systems. It provides an interactive graphical environment and a set of
block libraries that let you design, simulate and implement a variety of systems. Tools like Simulink are used to verify
and validate system properties and requirements from a model rather than the implementation.
In this exercise, we will be using Simulink to model a very simple predator prey system. By doing this, you will
familiarize yourself with building and modifying hierarchical graphical models with Simulink.
Predator Prey Model
You are asked to build a Simulink model that captures predator prey dynamics. Let x(t) represent the number of prey
and y(t) represent the number of predators at time t.
There are two factors that affect the prey population, their natural tendency to reproduce at a birthrate b
bx(t)
and the fact that predators eat them in proportion to the product of their populations parameterized by p, the rate of
