Very Short Simulink Tutorial In the Matlab command window write simulink. The window that has opened is the Simulink Library Browser. –It is used to choose.

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Presentation transcript:

Very Short Simulink Tutorial In the Matlab command window write simulink. The window that has opened is the Simulink Library Browser. –It is used to choose various Simulink modules to use in your simulation. From this window, choose the File menu, and then New (Model). –Now we have a blank window, in which we will build our model. –This blank window and the library browser window, will be the windows we’ll work with. We choose components from the library browser, and then drag them to our work window. –We’ll use only the Simulink library (also called toolbox) for now.

Simulink Tutorial As we can see, the Simulink library is divided into several categories: 1.Continuous – Provides functions for continuous time, such as integration, derivative, etc. 2.Discrete – Provides functions for discrete time. 3.Funcitons & Tables – Just what the name says. 4.Math – Simple math functions. 5.Nonlinear – Several non-linear functions, such as switches, limiters, etc. 6.Signals & Systems – Components that work with signals. Pay attention to the mux/demux. 7.Sinks – Components that handle the outputs of the system (e.g. display it on the screen). 8.Sources – Components that generate source signals for the system.

Simulink Tutorial: First simulation Drag the Constant component from the Simulink library (Sources) to the work window, and then drag the Scope module (Sinks) in the same manner. Now, click the little triangle (output port) to the right of the Constant module, and while holding the mouse button down, drag the mouse to the left side of the scope (input port) and then release it. You should see a pointed arrow being drawn. Double click the Constant module to open its dialog window. Now you can change this module’s parameters. Change the constant value to 5.

Simulink Tutorial: First simulation Double-click the scope to view its window. You can choose Simulation Parameters… from the Simulation to change the time limits for your simulation. Choose Start from the Simulation menu (or press Ctrl+T, or click the play button on the toolbar) to start the simulation.

Simulink Tutorial: First simulation Choose Start from the Simulation menu (or press Ctrl+T, or click the play button on the toolbar) to start the simulation. Now this is a rather silly simulation. All it does is output the constant value 5 to the graph (the x-axis represents the simulation time). Right-click on the scope’s graph window and choose Autoscale to get the following result:

Simulink Tutorial Now let’s try something a little bit more complicated. First, build the following system (you can find the Clock module in the Sinks category. The Trigonometric Function and Sum modules reside in the Math category):

Simulink Tutorial Now, let’s see if the derivative is really a cosine. Build the following system (the Derivative module is located in the Continuous category): We can see that this is indeed a cosine, but something is wrong at the beginning.

Simulink Tutorial This is because at time 0, the derivative has no prior information for calculation –there’s no initial value for the derivative, –so at the first time step, the derivative assumes that its input has a constant value (and so the derivative is 0).

An other example Let’s say that we have a differential equation that we want to model. The equation is: How can we solve this numerically using Simulink? We’ll notice 2 simple facts: 1.If we have A, then we have A' (multiplication). 2.If we have A', then we have A (integration). We can get out of this loop by using the initial condition. We know that A 0 = 0.5, so now we can calculate A' and then recalculate the new A, and so on.

Simulink Tutorial double-click the Integrator and choose Initial Condition Source: External. Note that pressing ctrl when clicking the mouse button on a line, allows you to split it into 2 lines: Set the simulation stop time to 3.5 seconds –the solution goes to infinity and see the results in the scope:

בנית מערכת ב Simulink Automatic Cruise Control עבור C = 6250 [N] B = 2.5 [N/(m/s) 2 ] M = 1250 [Kg] הערה : אות הבקרה משתנה בין 0 ל - 1, לכן כדאי להשתמש ב - Saturation

Automatic Cruise Control נבנה את הסימולציה של הרכב (plant)

Automatic Cruise Control

עבור תנאי ההתחלה ומהירות רצויה, בחן את התנהגות המערכת – עם בקר P, עם בקר I ועם בקר PI ( כל מקרה בנפרד ). – הערה : תגובה רצויה אמורה להיות : - מהירה. - ערך מקסימלי של (t) לא יעלה " מדי " מעל הערך הנדרש במצב מתמיד. - שגיאת המצב התמיד היא " אפס " ( קטנה ככל שניתן ).

Automatic Cruise Control P controller – No wind

Automatic Cruise Control P controller – with wind

Automatic Cruise Control I controller – No wind

Automatic Cruise Control PI controller – No wind

Automatic Cruise Control PI controller – with wind

Automatic Cruise Control