Week -2
SIMULINK MODEL OF DOORBELL SOLENOID
SOLENOID:
A solenoid is a 3 dimensional of wire. When this wire is wrapped around a mettallic block in a call and electricity is passed through it, it has some special magnetic properties. Electromagnetic induction makes it an electromagnet that can switched ON or OFF. The solenoid works just like a bar magnet. Where a solenoid operates on electric switch.
1.PULSE GENERATOR: The pulse generator block generates square wave pulse at regular intervels.
2.SIMULINK-PS COVERTER: Converts unitless simulink inputs into physical signals.C
3.SCOPE: Displays signals generated during simulation.
4.SWITCH: Switch controled by external physical signal.
5.BATTERY: It is a simple block models.
6.SOLENOID: Model electrical charactersitcs and gnerated force of solenoid.
7.IDEAL TRANSLATIONAL MOTION SENSOR: Variable measured between two mechanical translational nodes into a center signal proportional to velocity or position.
8.MECHANICAL TRANSLATIONAL REFERENCE: Reference point or frame ,for all mechanical translational ports.
9.ELECTRICAL REFERENCE: Its a electrical ground.
10.SOLVER CONFIGURATION: Its a solver parameters that model need before simulation.
CONNECTIONS:
The pulse generator is used to give signal input and the simulink-ps converter converts the input signal into pysical signal. The electric circuit consists of a solenoid,battery and a switch and are connected accordingly and a mechanical port is connected to ideal translation motion sensor and mechanical translation sensor. The p port of sensor is connected to PS-simulink converter to provide output signal. The solver configuration is connected to electrical reference before the begning of the simulation.
OUTPUT:
Here,The switch is closed for 2 seconds and after the swtich is open. Amplitude = 0 means the switch is closed. And the plunger strikes after every 2 seconds.
QUESTION 2
A thermistor to sense the temperature of a heater & turn on or turn off the fan as per the below conditions:
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
BLOCKS:
1.SIGNAL BUILDER: It is used to build a siganal in a simulink.
2.CONTROLLED TEMPERATURE SOURCE: It is ideal source of thermal energy that is powerful enough to maintain specific temperature differance across the source regardless of heat flow consumed by the system.
3.THERMISTOR : It is thermally sensitive resistor precise change in electrical resistance when subjected to a corresponding change in body temperature.
4.RESISTOR: A passive two-terminal electric component that implements electrical resistance as a circuit element.
5.VOLTAGE SENSOR: A sensor used to calculateand monitor the amount of voltage in an object.
6.SCOPE: Displays signals generated during simulation.
7.SWITCH: Switch controled by external physical signal.
8.CONSTANT: Assign the value.
CONNECTION:
Signal builder is used as a input and the signal is converted by simulink-ps converter. And the controlled temperature is connected with solver configuration. The thermistor is connected with a resister and voltage sensor with battery. electrical reference is connected to the circuit. with the ps-simulink converter the signal is connected with a switch with two constant and output is observed using a scope.
OUTPUT:
Fan condition is ON when the temperature is above 25 degree celcious.