Week -2
solution 1 . door bell
We have used following blocks in the model 1. Pulse Generator . 2. Switch , 3. Battery . 4. Solenoid . 5. Ideal Translational motor sensor . 6. Mechanical translational reference . 7. Electrical reference . 8. Scope As per given conditions switch is closed for 2 seconds & then released . The pulse generator is used to create square wave pulses at regular intervals . The block waveform parameters amplitude , pulse width , period and phase delay , determine shape of the waveform.
as from model we can observe that pulse is genrated every 2 second which will lead to switch on and off the switch when the switch is on battery power is given to solenoid this will generate flux and plunger will be moved we can check the movment of plunger with the help of scope.
# soution 2
Use a thermistor to sense the temperature of a heater & turn on or turn off the fan as per the below conditions:
block used
1. controlled tempreture source
2. battery
3. resistor
4. thermistor
5. voltage sensor
6. electrical referese
7. scope
8. display
input value
In this model the signal block is used to get temperature signal for the controlled temperature source ( heater ) . The temperature of the heater is supplied to thermistor to sense it . Now in order to run the fan when temperature reaches the value of 298K we have to trigger the circuit with some external supply of battery and as there is no device to calculate the resistance value of thermistor so we have attached another resistor in series across the terminal in series . The voltage sensor is attached across the resistor to calculate the voltage drop into it & this voltage drop value is inputted as threshold value to the switch to start the fan & fan will go on when threshold value is more than 0.218.
out put result
from0-10 second fan is off because tempreture is 293k which is below 298k after 10 second it goes to 300k, so fan will on because tempreture exceed 298k. after 30 second fan will turn off because tempreture goes 296k less than 298k.