Week -2
Q.1) Make a simulink model of Doorbell using solenoid block with the following details:
Ans.: Simulation Model of doorbell using Solenoid block:
- Below is the Description of all the blocks used in this model:
Model Working: when Switch is closed the electromagnet receives electrical power from battery and pulls arm then ideal translational motion sensor sense the movement and gives output by scope.
I) Solenoid: Electrical signal converts into kinetic energy. The solenoid block represents the electrical characteristics and generated force.
II) Battery: Gives supply to solenoid.
III) Switch: To complete the connection when it close supply flows through circuit and pulls metal arm to hit.
IV) Pulse Generator: Pulse generator block generates square wave pulses at regular interval.pulse generated from PG is converted to simulink to physical signal and given to perform switch function.
Values of PG: Amplitude- 1, pulse width - 20,period - 10 sec. phas delay - 2
V) Ideal Translational motion sensor: This motion sensor senses Physical movements of solenoid.
Output:
:
Observations: From 0 to 2sec. output is null and from 2 to 4 sec. it gives oscillations.
Q.2 ) Use a thermistor to sense the temperature of a heater & turn on or off the fan as per below conditions:
Temperature sources 20 degree C from 0 to 10 sec., 27 degree C from 30 to 50 sec.
Fan Condition: ON if the temparature above 25 degree C ,OFF otherwise.
Ans.: Model :
Following are the block details with description:
I) Thermistor: Temperature sensing element.Negative temperature coefficient thermistor using B-parameter equation.
II) Controlld Temperature Source: The block represents an ideal energy source in a thermal network that can maintain controlled temperature differance regardless of the heat flow rate.
III) Signal Builder : Function to create and access signal.
IV) DC voltage source: This block mntains time invarient ( constant) voltage across its output terminals independant of the current through the source.
V) Voltage Sensor: The block represents ideal voltage sensor , a device that converts voltage measured between any electrical connections into physical signal proportional to the voltage.
VI) Switch: Switch block passes the first input or the third input signal based on the value ofthe second input. The first and third inputs are date input.The second input is a control input. Specify the condition under which the block passes the first input by using the criteria for passing first input and threshold parameters.
Model Operation: As pr the given conditions created the signals from signal buider block as the model shown above. Firstly convert all temperature which are in dgree selcious into kelvin by adding 273.15 then connect the constant block instead of signal builder and check the voltage of 25 degree celcious(25+273.15) in display that value inserted as threshold value in switch then again connect the signal builder and check the output from scope.
Output:
:
Observations: Output shows that switch is ON when temp.is above 25 which is in interval of 10 to 30 secs.
Below Are the links of model as unable to browse.
https://drive.google.com/file/d/1H0kIBYpiufkBoAzReVZFLyLwpAk-uj0y/view?usp=sharing
https://drive.google.com/file/d/18FDVIrfOUQ1rwe0-rMaPaGnYHrlEY-L9/view?usp=sharing