Exercise on Simulink Modeling

Que. 1

AIM: To create a Simulink model which performs simple arithmetic calculations.

OBJECTIVES :

• To perform simple arithmetic calculations such as add, subtract, multiply & divide.

SIMULINK MODEL :

SUBSYSTEM :

BLOCKS USED :

• Constants
• Subsystem
• Add
• Subtract
• Divide
• Product
• Display

EXPLANATION :

• To perform simple arithmetic calculations we first sorted out all the required blocks.
• The two constant blocks have different input values.
• These constant blocks are connected to ADD, SUBTRACT, DIVIDE and PRODUCT blocks to process the result and later converted into a Subsystem Block.
• The Subsystem blocks out were further connected to their respective Displays which shows the final arithmetic calculation.

RESULTS :

CONCLUSION :

Hence we have created a Simulink model which performs all the simple arithmetic operations such as add, subtract, multiply and divide operations using the given inputs.

Que. 2

AIM: To create a Simulink model which will replicate the behaviour of Assertion Library Block.

OBJECTIVES :

• To replicate the behaviour of Assertion Library Block.

SIMULINK MODEL :

BLOCKS USED :

• Constant
• Compare to Zero
• Stop Simulation
• Display

EXPLANATION :

• To get similar behaviour we first sorted out all the required blocks.
• We took a Constant block having 5 elements in a single row.
• Next, we use a Comparision block which compares whether input elements were equal to zero or not.
• At Output, we have a Display and a Stop Simulation block.
• If the input is equal to zero then it will show the result as 1 stating that the comparison is true. If the input is non-zero then it will show the result as 0 stating that the comparison is false.

RESULTS :

CONCLUSION :

Hence we have created a Simulink model which replicates the behaviour like Assertion Library Block and gives the result in the form of 0's & 1's based on the comparison.

Que. 3

AIM: To design a Simulink model that allows Air Conditioners to operate dependent on the temperature of the room.

OBJECTIVES :

• To create a subsystem for an AC which will be enabled only by giving an input voltage of 5V.
• When Room Temperature is greater than 30, 1 AC must be turned on.
• When Room Temperature is greater than 40, both AC must be turned on.

SIMULINK MODEL :

ENABLED SUBSYSTEM :

BLOCKS USED :

• Input & Output Ports
• Enable Subsystem
• Relation Operators
• Vertical Sliders
• Constants
• Displays
• Lamps

EXPLANATION :

• For creating a Simulink model for an enabled subsystem that consists of two ACs, we first sorted out all the required blocks.
• We have one Input Port and three Output Ports for room temperature and AC respectively.
• Based on the conditions if the room temperature is greater than 30°C then the ACs must be turned ON/OFF.
• All these operations are controlled by an enabled system which will be enabled only on giving an input voltage of 5V.
• So we gave a relation operator to compare the voltage which needs to be equal to 5V.
• With Temperature as input, we connected it with a slider which gives us a variable temperature while sliding manually.
• At Output, we have three ports - Room Temperature, AC 1 and AC 2.
• When the temperature is greater than 30°C, then AC 1 will gets ON and the lamp colour will change to Green.
• When the temperature is greater than 40°C, then AC 1 will remain ON and AC 2 will gets ON and the lamp colour will change to Green.
• If the room temperature gets below 30°C, then both the ACs will be turned OFF simultaneously.

RESULTS :

1. Condition: Voltage == 5 at Room temperature less than 30. AC is in the OFF state.

2. Condition: With Voltage == 5 and Room Temperature is greater than 30, AC 1 turns ON.

3. Condition: With Voltage == 5 and Room Temperature is greater than 40, both AC 1 and AC 2 turns ON.

CONCLUSION :

Hence we have created a Simulink model using an enabled subsystem that will Turn ON/OFF the AC based on the room temperature.

Que. 4

AIM: To design a Simulink model that allows light to be turned ON/OFF in a room based on luminous intensity.

OBJECTIVES :

• To create a subsystem for the light which will be enabled only by giving an input voltage of 5V.
• To turn ON and OFF the required lights in a room based on luminous intensity.

SIMULINK MODEL :

ENABLED SUBSYSTEM :

BLOCKS USED :

• Input & Output Ports
• Relation Operators
• Enabled Subsystem
• Constants
• Displays
• Lamps
• Vertical Slider

EXPLANATION :

• To create a Simulink model which will turn ON/OFF the Lamps based on the Luminous Intensity, first we sorted out all the required blocks.
• Then based on the given condition we arranged Relation Operators so as to get the desired lamps turning ON as per the intensity. They are :
• If the luminous intensity is greater than 80 then all lamps will be in the OFF state.
• If the luminous intensity is less than 80 then Lamp 1 turns ON.
• If the luminous intensity is less than 60 then Lamp 1 and Lamp 2 turns ON.
• If the luminous intensity is less than 4 then Lamp 1, Lamp 2 & Lamp 3 turns ON.
• All these operations are controlled by an enabled system which will be enabled only on giving an input voltage of 5V.
• Later this system is converted into a subsystem having Luminous Intensity at Input and Display at the Output.
• To get variable Luminous Intensity at input we have connected a vertical slider which is controlled manually.
• Based on the Intensity and conditions the result is shown in the display and accordingly Lamps Turns ON/OFF.

RESULTS :

1. Condition: Voltage == 5 and Luminous Intensity is greater than 80 then all Lamps are in OFF state.

2. Condition: Voltage == 5 and Luminous Intensity is in between 60 and 80, then Lamp 1 Turns ON.

3. Condition: Voltage == 5 and Luminous Intensity is in between 40 and 60, then Lamp 1 & Lamp 2 Turns ON.

4. Condition: Voltage == 5 and Luminous Intensity is less than 40, then Lamp 1, Lamp 2 & Lamp 3 Turns ON.

CONCLUSION :

Hence we have created a Simulink model using an enabled subsystem that will Turn ON/OFF the Lamps based on the Luminous Intensity.

Que. 5

AIM: To create a Simulink model to understand the behaviour of the saturation Simulink library block.

OBJECTIVES :

• To create a user-defined library of saturation custom blocks, add it to a Simulink model.
• To create a mask for the library block in the Simulink model.

SIMULINK MODEL :

SUBSYSTEM :

BLOCKS USED :

• Constants
• Input & Output Ports
• Relation Operators
• Logical Operator
• Switch
• Display

EXPLANATION :

• To create a Saturation Simulink model which gives similar results, we first sorted out all the required blocks.
• Then created a library block that consists of a Subsystem.
• This Subsystem performs the logical as well as relation operation. It consists of an input port.
• These inputs were connected with relation operators based on the specified condition to give us the desired output.
• Once the system is ready, it is then converted into a Subsystem and later dragged or copy-paste to a Simulink Blank Model.
• In Simulink Blank Model this subsystem is then Masked with additional descriptions along with specified input parameters such as Upper_Limit and Lower_Limit.
• Lastly, we connected all the required constants at input and display at the output.

RESULTS :

CONCLUSION :

Hence we have created a Simulink model which helps to understand the behaviour of the saturation Simulink library block.

Que. 6

AIM: To create a MATLAB function block for the given logic using the MATLAB fcn library block.

OBJECTIVES :

• To create a MATLAB function block.
• To solve the logic using the MATLAB fcn library block.

SIMULINK MODEL :

FUNCTION :

function y = fcn(C1,C2,C3,C4,C5)

y = ((C1 == C2) || (C1 == C3) || (C1 == C4) && (~C5));

BLOCKS USED :

• Constants
• MATLAB Function (fcn)
• Display

EXPLANATION :

• First we sorted out all the required blocks to solve the logic operation.
• Then we derive the values of Constant blocks (C1 = 5, C2 = 6, C3 = 5, C4 = 1, C5 = 0) as given.
• These blocks were connected to a MATLAB Function block which creates a function (fcn) that help to perform the logic operation. The logic used in the function were ==, ||, &&, ~.
• The output of the Function block is connected with a Display to get the final result.

RESULTS :

CONCLUSION :

From the above result, we have derived a MATLAB function for the given logic using the MATLAB library block.

Where, y = ((C1 == C2) || (C1 == C3) || (C1 == C4) && (~C5)) and its output is displayed.