Week -2
Aim:
1.To make a Simulink model of doorbell using solenoid block when the swith is closed for 2secound and then released .observed the movement of plunger.
2.Use a thermistor to sense the temperature of a heater . turn off& on fan as per following condition.
Door bell:
Blocks used:
Battery block: this block generate a voltage source which helps supplying electrical power to solenoid block.
Pulse generator: this block is used to generate a voltage pulse to the switch block.
Solenoid block: its used to convert electrical energy into mechanical motion.
Ideal translation motion sensor: its used to detect weather there is any liner motion in the solenoid block during the simulation.
Scope: its used to record and plot the result of ideal translation motion sensor.
Process:
When the switch is closed the electromagnet receives electrical power from the battery and pulls the lever, ideal translation mention sensor sense that movement and given the output by scope.
Output:
Observation:After successfully running that simulation can be visualized by using scope and display block show the output value.
The switch is closed for 0 -2 sec output is null. And from 2-4 its give oscillation.its all are record the value with help of scope block.
2. Use a thermistor to sense the temperature of a heater & turn on or turn off the fan as per the below conditions:
Temperature source: 20 °C from 0 to 10 seconds, 27 °C from 10 to 30 seconds, 23 °C from 30 to 50 seconds
Fan conditions: ON if the temperature above 25 °C, OFF otherwise
Simulink model has been constructed to sense the temperature of a heater and tur the cooling fan On when the temperature reaches above 25 °C otherwise the fan will be offthe help of temperature sensing device knows as thermistor
Thermistor: it’s a heat sensing resister.they convert heat engery into electrical current. Its have -ve temperature coefficient of resistance.it made by heating under high pressure semiconductor ceramic made from mixture of metallic oxide ,nickel,cobolt,copper,iron.
Model:
Blocks used in circuits:
Signal buildrer: creat and generate interchangeable gropus of signals whose waveforms are piecwise linear.
Simulink -ps converter :convert Simulink input signal into physical signal.
Controlled temperature source: variable source of thermal energy characterized temperature.
Thermistor: negative temperature coefficient thermistor using B-parameter equation.
Switch: switch controlled by external physical signal.
Solver configuration: physical networks environment and slover configuration.
Electrical raferencre: connenction to electrical ground.
Mechanical translation reference: reference connection for mechanical translation ports.
Ps-simulink converter: convert physical signal into Simulink output signal.
Controlled voltage source:ideal voltage source driven by input signal..
Dc motor: dc motor model with electrical and torque charaterisitcs and fault modeling
Scope:display signals generater during simulation.
Dashboard scope: trace signals during simulation
Results: