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In response MATLAB displays the Simulink Library Browser. Next select New Model from the File pull down menu in the Library Browser The. following blank window appears on your screen We will refer to this window as the. model window, In this model window models are drawn and edited mainly by mouse driven commands. There are two major categories of elements in Simulink. Blocks are used to generate modify combine output and display signals Lines on the. other hand are used to transfer signals from one block to another. There are several general classes of blocks some of which are. Sources Used to generate various signals Sources blocks have outputs but no. inputs One may want to use a Constant input a Sine Wave a Step a Ramp a. Pulse Generator or a Uniform Random number to simulate noise The Clock may be. used to create a time index for plotting purposes, Sinks Used to output or display signals Sinks blocks have inputs but no outputs. Examples are Scope Display To Workspace Floating Scope XY Graph etc. Discrete Discrete Filter Discrete State Space Discrete Transfer Fcn Discrete Zero. Pole Unit Delay etc, Continuous Integrator State Space Transfer Fcn Zero Pole etc. Signal routing Mux Demux Switch etc, Math Operations Abs Gain Product Slider Gain Sign Sum etc. Lines transmit signals in the direction indicated by the arrow Lines must always. transmit signals from the output terminal of one block to the input terminal of another. block One exception to this is that a line can tap off of another line This sends the. original signal to two or more destination blocks, Lines can never inject a signal into another line lines must be combined through the use.
of block such as a summing junction A signal can be either a scalar signal or a vector. Building a Simulink model, Building a Simulink model of a system consists of selecting the appropriate blocks and. connecting them in a way that represents the mathematical models. Since the best way to learn a simulation tool is to work with it this first tutorial will. guide you through a simple example We will build the block diagram for a simple. model consisting of a sinusoidal input multiplied by a constant gain which is depicted. Six Distinct Blocks, The Simulink model will consist of 6 distinct blocks namely Sine Wave Scope Mux. Clock and To Workspace The Sine Wave is a source block from which a sinusoidal. input signal originates The signal is transferred through a line in the direction indicated. by the arrow to the Gain block The Gain block modifies its input scales it by 5 and. outputs a new signal through a line The output of the Gain block and the output of the. Sine Wave are combined in the multiplexer Mux to form a signal vector The signal. vector is transferred through a line to the Scope block used to display a signal much like. an oscilloscope,Specifications of Model,Block Name Specifications Location. Amplitude 1v,Sine Wave Frequency 1 rad s Sources,Scope Time range 10s Sinks. Gain Gain 5 Math Operations,Mux 2 Inputs Signal Routing.
Clock None Sources,To Workspace Save Format Array Sinks. Simulation Parameters Stop time 1000 Max step size 0 001. Model Creation, Creating a working model with Simulink is straightforward The process involves four. 4 basic steps as depicted in the following flowchart. First you will gather all the necessary blocks from the Library Browser Then you will. modify the blocks so that they correspond to the blocks of the desired model Lastly but. not the least you will connect the blocks with lines to form the complete system and set. the overall simulation parameters After this you will simulate the complete system to. verify that it works,A Step one Select desired blocks. Getting the blocks into the model window, Follow the steps below to collect the necessary blocks. Create a new model New from the File menu You will get a blank model window. Click on the Sources icon in the Library Browser This opens the Sources window. which contains the Sources block library Sources are used to generate signals. Drag the Sine Wave and Clock blocks from the Sources window into the left side of. your model window, Click on the Sinks icon in the Library Browser to open the Sinks window.
Drag the Scope and To Workspace blocks into the right side of your model window. Click on the Signal Routing icon in the Library Browser to open the Signal Routing. Drag the Mux block into the your model window, Click on the Math Operations icon in the Library Browser to open Math Operations. Drag the Gain block into your model window,B Step 2 Configure block parameters. Resizing and moving blocks, First select the block by clicking with your left mouse button while the pointer is on. the block In each corner of the block a little filled square appears Put the pointer on. one of the corner press the left mouse button and keep it pressed down Move the. mouse and release the mouse button when the block has the desired size. To move a block you first have to select it Then put the pointer inside the block. press the left mouse button down and keep it pressed down Drag the block to its new. position and release the mouse button,C Step 3 Connecting block inputs and outputs. Adding a branch line, To connect the output of the Sine Wave to the input of the Mux block you will use a.
branch line Drawing a branch line is slightly different in that to start the branch line. must be welded to an existing line Position the pointer on the line that connects the Sine. Wave block to the Gain block Without moving the mouse press and hold down the. CTRL key and then press and hold the left mouse button Drag the pointer to the input. port of the Mux block and release the mouse button. D Step 4 Configure simulation parameters,Step 4 1 Adding Annotation. Annotations add textual information about the designed model One can add an. annotation to any unoccupied area of your block diagram To create a model annotation. double click in an unoccupied area A small rectangle appears and the pointer changes to. a vertical insertion bar Start typing the annotation content To start a new line simply. hit the Enter key Each line is centered within the rectangular box that surrounds the. annotation To close the annotation click with the mouse elsewhere in the window. In your block diagram you will place a title at the top and you will place your name and. date at the lower right as depicted below, To move an annotation drag it to a new location To change the font size of an. annotation select it and with the mouse select Format and then Font In the pop up. window select the desired font size and then click OK The font size will change when. the annotation is deselected to do so simply click elsewhere. Step 4 2 Adding Signal Labels, Labels can be added o lines to further annotate your model To create a signal label. double click on a line segment and type the label at the insertion point When you click. on another part of the model the label fixes its location. To move a signal label point at it with the mouse press and hold the left mouse button. and drag the label to a new location To unselect a label click elsewhere in the model. E More Modifications,Modify blocks, Follow these steps to properly modify the blocks in your model. Double click your Sine Wave Change the frequency to 1 rad s and the amplitude to. 1v Close the dialog box, Double click the Gain block Change the gain to 5 and close the dialog box.
Copying blocks, Position the pointer on the block to be copied press the right mouse button down and. keep it pressed down to copy the block Drag the copy of the desired position and. release the mouse button, Alternatively you can use Copy and Paste topics of the Edit menu to copy the block. Removing blocks,Select the block to be removed, Press the Delete key on your keyboard or select the Cut topic in the Edit menu. Connecting blocks with lines, Now that the blocks are properly laid out you will now connect them together Follow. these steps, Drag the mouse from the output terminal of the Sine Wave block to the upper input of.
the Sum block, Let go of the mouse button only when the mouse is right on the input terminal Do. not worry about the path you follow while dragging the line will route itself. The resulting line should have a filled arrowhead If the arrowhead is pen it means it. is not connected to anything You can continue the partial line you just drew by. treating the open arrowhead as an output terminal and drawing just as before. Run Simulation, Double click the Scope block Scope window will pop up Then click Simulation Start. you will see the simulation result is plotted in the Scope Click Autoscale an icon of. Telescope the Scope will rescale the plot and make it fit the window You can also. Zoom in out the plot You can also rescale the axes by right click on the axes. Fourier Series Synthesis,Simulation Parameters, In the model window select Configuration Parameters from the Simulation menu as. depicted below,You will see the following dialog box. There are many simulation parameter options we will be concerned with the Start time. and Stop time which tell SIMULINK over what time span to perform the simulation. Keep the Start time at 0 0 and change the Stop time from 10 0 to 1000 00 Next we will. alter the Max step size Change Max step size from auto to 0 001 Close the dialog box. by clicking OK and run the simulation, After hitting the Autoscale button the Scope window should provide a much better.
display of the output, The scope block displays its input with respect to simulation time The Scope block can. have multiple axis all axes have a common time range You can move and resize the. Scope window and you can modify the Scope s parameter values during the simulation. When you start a simulation Simulink does not open Scope windows. Y axis Limits, You set Y limits by right clicking an axis and choosing Axes Properties The following. dialog box appears,Y min Enter the minimum value for the y axis. Y max Enter the maximum value for the y axis, Title Enter the title of the plot You can include a signal label in the title by typing. SignalLabel as part of the title string,Scope Parameters.
You can alter axis limits set the number of axes tick labels sampling parameters and. saving options by choosing Parameters toolbar button as depicted below. When you click the Parameters button the following dialog box appears. The dialog box has tow panes General and Data History. General Parameters, You can set the axis parameters time range and tick labels in the General tab You can. also choose floating Scope option with this tab,Numbers of axes. Set the number of y axes in this data field With the exception of the floating Scope. there is no limit to the number of axes the Scope block can contain Note that the number. of axes is equal to the number of input ports,Time range. What is Simulink Simulink an add on product to MATLAB provides an interactive graphical environment for modeling simulating and analyzing of dynamic systems It enables rapid construction of virtual prototypes to explore design concepts at any level of detail with minimal effort For modeling Simulink provides a graphical user interface GUI for building models as block diagrams It

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