Week -2

1.

Aim:- Simulink model of doorbell using solenoidal block.

Condition:- Switch is closed for 2 second and released.

Block used:-

• Pulse generator.
• switch.
• Battery.
• Solenoid.
• Scope.
• Sover configuration.
• Electrical Referenc.
• Mechanical Translational Referenc.
• Ideal Translational motion sensor.

Model:-

Model explained:-

• A pulse generator is given input for bell is engage for 2 second and released.

• The signal from pulse generator converted using a simulink-PS converter and is given as the input to the switch.
• A solenoid and battery is connected to it.
• The switch is also connected to the circuit.
• The position of solenoid plunger is measured using ideal translational motion sensor.
• Mechanical and electrical refrences are connected to the respective circuit.
• Output from ideal translational motion sensor is converted using PS-simulink converter and is given to scope to show result.
• A scope is also connected to the input to see the input signal behaviour.

Input signal:

Output signal:

2. Use a thermistor to sense the temperature of a heater & turn on or turn off the fan.

Aim:-

A simulink model of thermistor to sense the temperature of a heater &turn on or turn off the fan.

Condition:-

Temperature source: 20C from 0 to 10 seconds, 23C from 30 to 50 seconds.

Fan condition: ON if the temperature above 25C, OFF otherwise.

Blocks used:-

• Signal builder
• Controlled temperature source
• Thermistor
• Resistor
• Voltage sensor
• Voltage source
• Switch
• Scope
• Display
• PS-simulink converter
• Simulink-PS converter
• Solver configuration

Simulink model:-

Explanation of model:-

• Input signal is given to signal builder and Connected with thermistor through controlled temperature source. The inputs signal is given to the thermistor.
• In signal builder temperature in kelvin is given in the form of signal.
• Thermistor is connected to resistor connected in the current flowing direction.
• Across resistor voltage sensor is connected.
• Voltage source is connected across thermistor and resistor and electrical reference connected to it.
• Output terminal of voltage sensor is connected to switch in which switch parameter conditions are fan is ON when temperature is above 25C below that fan will be OFF.
• It further connected to scope to show the result.

Output:-

• For 0 to 10 second fan is in OFF condition because temperature is 293K.
• For 10 to 30 second fan will be ON bacause temperature is 300K.
• For 30 to 50second fan will be OFF bacause temperature is 296K.