Week -2

Answer 1: Below is a Simulink for Door Bell using Solenoid Block.

Explanation for the above Sumulink Model of the Door Bell :-

The Pulse Generator is used to create sqaure wave pulses at regular intervals. The block wave form parameters Amplitude, Pulse width, Period & Phase Delay determine the shape of the output form.

• The Switch Block used is controlled by external physical signal.
• If the external physical signal is grater than the threshold parameter, then the switch is closed otherwise its open.
• The positve terminal of the switch is connected to Switch and the negative to Electrical Reference block.
• The Solenoid Block is connected with switch & battery block, then a circuit is completed.
• The port c is connected with mechanical reference.
• The Ideal Translational Sensor is connected with Solenoid Block to observe the movement of the plunger.
• Scope is connected with the ideal translational sensor to the output.
• PS- Simulink Convertor is used to convert physical signal to simulink signal.
• Solver Configuration: Each Physical network represented by a connected simscape blocks requires solver setting information for simulation.

Google Drive Download:

https://drive.google.com/file/d/10beFr80BIJSNc5RAhgQA4EwXrKxhn0AL/view?usp=sharing

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Answer 2. Using 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

• Signal Builder Block is used to give inputs.
• Controlled Temperature Source respresents an ideal source of thermal energy, that can maintain a controlled temperature difference regardless of heat flow rate.
• Thermistor is a type of resistor whose resistance is based upon temperature.
• A linear resistor is used to control the amount of current from the battery.
• The voltage sensor is used to control the voltage measured between two points into a physical signal.
• Voltage source represents either Ac or DC.
• Electrical reference block is given.
• Solver configuration is provided for each physical network respresented by a connected simscape blocks for solver configuration.

Google Drive:

https://drive.google.com/file/d/17fXs8lJTExk8_GJnlVBxuTmCq3m9xWdu/view?usp=sharing