Week -2

explanation of application of door bell:

1.In the above given question i understood that when the switch is turned on then circuit becomes active and soleniod activates the piunger its going to hit the bell
2.Soleniod valve is eletronic device that converts electrical energy to mechanical energy a magentic field is there in the coil when current flows it is activates the plunger to hit the bell

door bell model:

1.At first we have to take pulse generator as input and connected to switch converting simulink signal to physical signal by 'simulink ps converter'

pulse generator amplitude = 4 and pulse width is 50% so that 4 of 50% is 2 seconds

2.switch one end is connected to positive terminal of battery and another end negative terminal of battery is connected to solenoid valve negative terminal and positive terminal of solenoid is connected to switch
3.electrical resistance is also connected and solver configuration is connected to electrical reference
4.the plunger R is connected to ideal translational sensor and c of soleniod is connected to mechanical translational reference
5.finally physical to simulink converter is used to show the scope and display valves

task 2:

thermistor theory:

Thermistor is a device that converts thermal energy into electrical energy and it is a resistance thermometer whose resistance is dependent on temperature.
there are two types of thermistors
1.negative temperature coefficient
2.positive temperature coefficient
in NTC when temperature increases resistor decreases and temperature decreases resistor increases the NTC type is used most
In PTC when temperature increases resistor increases and temperature decreases resistor decreases

thermistor model:

here the input is taken as 'repeating sequence stair' the data is given based on initial conditions
temperature 20 degree celsius from 0 to 10 seconds
27 degree celsius from 10 to 30 seconds
23 degree celsius from 30 to 50 seconds
fan condition above 25 degree celsius it is ON otherwise OFF
the input is given in temperature with conversion of kelvins 293,300,300,296,296

we have to take 'controlled temperature source' before this we have to convert simulink into physical settings by 'simulink ps converter'and thermal reference is also connected to controlled temperature source. thermistor positive terminal is connected to battery positive terminal battery negative terminal is connected to 'current sensor' which measures the current and it is connected to 'switch' by connecting 'ps simulink converter' the valve obtained is displayed in display block. this is give threshold valve inside the switch which has 2 outputs based on 2 conditions if the valve is above the threshold valve of the output will be 1 and f the valve is below the threshold valve it is below 0 the final output is displayed in scope

so based on the fan conditions the fan should work on time period on 10 to 30 seconds