Week -2
1. Simulink model of door bell ring
Electric bell works one of the simple mechanism called electromagnetism, there are two types of magnet permanent magnet and temporary magnet. Here we are using temporary magnet where a curent is passed through series of electric coils and magnetic field is produced and this magnet magnetic field attracts the arm and the arm hits on thye gong. as soon as the arm gets attracted there is no curernt flowing through the circuit and the arm is pushed pack with the help of spring, and to stop the fluctation of the arm damper is also used.As the arm gets back to intial position there is again current flow through it,and this process continues.
1)With the help of purse generator we can control the working of the switch. In the pulse generator we can control the width, amlitude,phase delay.
2)ideal translational motion sensor is used to see how the arm is fluctuating
3)battery is connect as a power source
Signal input-
output -
If fluctation are too high this could be reduced by providing low stiffness and high damping value
Thermistor to sense the temperature of heater and turn on and off the fan.
Circuit model-
Signal to the circuit
As the signal is given for 50secs with varying temperature and according to this signal the circuit has to be worked.
1)This signal is passed through controlled temperature source and the input is given to thermistor, the temperature are given in kelvin because thermistor has dissipation factor in kelvin
2) The curent is passed is through the resistor and their is volatge drop in this and the voltage drop is calcultaed first mentoining the 25 degree celcius because the threshold value is calculated for operating of the if else.
3)Then after if else condition get satisfied then the curent flows through the second circuit.
4)As current flows through the controlled voltage source and this control the given voltage irrescpective of the current.
5) And current is pass through the dc motor which operate the the rotor in it and this is measured by ideal rotational sensor and the out put can be seen in the scope.
output -
This is indicating fan is switched on above 25 degree celsisus and switched off back when its below 25 degree celsius.