Week -2

AIM- 1. To make a simulink model by using solenoid model.

2. To use the thermistor to sense the temprature of heater and turn on/off the fan.

Simulink model explanation-

we have used following blocks in the model-

1. Pulse generator .

2. Switch.

3. Battery.

4. Solenoid.

5. Ideal Translational motor sensor.

6. Scope.

7. Electrical reffference & Mechanical translaitional reference.

As per given conditions switch is closed for 2 sec. & then released.

The pulse generator is used to create square wave pulses at regular intervals. The block waveform parameters,

amplitude, pulse width, period and phase delay, determine the shape of waveform.

Switch block is controlled by external physical signal & if the external physical signal is greater than the switch is closed or else switch is open.

Positive terminal is connected to block while as, the negative terminals is connected to the electrical refference . when we connect to solenoid block with the switch and battery form a complete electrical circuit.

The port c is connected with mechanical refference. The ideal translational motion sensor is connected with the solenoid block R is to observe the movement of the plunger. scope is connected to the ideal translational motion sensor to get the output.

The signal from the pulse generator was converted using by the simulink-ps converter and is given to the input switch. A solenoid intrduced and battery is connected to the it. The voltage of the battery connected was made as same as that of the rated voltage of the solenoid.

The position of the solenoid plunger is measured using an ideal translational motion sensor connected to the circuit .

The initial position of the set to 5mm in the translational motion sensor. The scope is connected to visualize its behaviour. The spring constant and damping parameters of the solenoid block was altered to obtain the desired graph.

The simulation was run for 30 sec and obtained is shown above. It can be observed that at each 2 seconds bell was ringing.

Conclusion for Door Bell-

Giving input as the time period for 2 seconds in the pulse generator to open & close the switch. when the switch is closed the solenoid block receives electrical power from the battery and plunger moves from R To C port to hit the bell and produce sound.

Thermistor-

Temperature source - 20 from 0 to 10 sec, 27 from 10 to 30 sec, 23 from 30 to 50 secs.

Fan condition ON if temperature above 25 degree, OFF otherwise.

Simulink and explanation-

Signal Building block is added to input the values as per given conditions.

At point 1, time = 0sec. to 10 sec. & temp = 293k.

At point 2, time = 10sec. to 30 sec. & temp = 300k.

At point 3, time = 30sec. to 50 sec. & temp = 296k.

Controlled temperature source reprensts an ideal source of thermal energy, that can maintain controlled temperature difference regardless of heat flow rate. The temperature difference is set by the physical signal port S. A positive temperature differrence causes the temperature at port B greater than the temp at port A.

Thermistor is a type of resistor whose resistance is based upon the temperature.

A linear resistor is used to convert the voltage measured between two points into physical signal & voltage source represents AC/DC.

Electrical refference block is given.

Solver configuration- each physical network represented by the connected simscape blocks requires solver setting information for simulation.

DETAILED TEMPERATURE SOURCE-

Thermistor-

From 0-10 sec fan is off because the temperature is 293k which is below 298k. after 10 sec it goes to 300k so fan will turn ON beacuse temperture exceeds 298k. after 30 sec fan will turn off beacause value goes 296k which is less than the 298k.