Week -2

1.

Model:

Pulse:

Explanation:

• The simulink model of a door bell is created by using a solenoid block, as per the given situation where switch is closed for 2s.
• The switch is controlled by using the pulse generator which is connected to the switch via simulink to ps convertor.
• The total time taken for the simulation is 10s.
• A battery is used as the power source for the doorbell.
• The positive and negative terminals of battery and solenoid are connected, with the switch in between.
• An electrical reference is also connected to the circuit along with a solver configuration block.
• The R terminal of the solenoid is connected to a ideal translational motion sensor and the C port of both the blocks are connected to mechanical translational reference.
• The position of the plunger is detected by the sensor and it is shown using a scope block via ps to simulink convertor.
• The parameters of the solenoid are kept as default with damping coefficient as 1 and the results are shown as below.

Output:

2.

Model:

Parameters:

Explanation:

• The simulink model is created by using a thermistor to sense the temperature of a heater & turn on or turn off the fan as per the conditions.
• The given conditions of change in temperature is created by using a signal builder as shown in the above figure.
• The signal builder acts as input for the controlled temperature source and is connected by using a simulink to ps convertor by changing it's parameters to take signal as input and a thermal reference is connected to the other port.
• The thermistor takes input from the source and the output is given to the electric circuit with a battery, resistor, electrical reference and a voltage sensor.
• The output of the voltage sensor is displayed and sent to the switch via ps to simulink convertor.
• The threshold value of the switch is determined by the displayed voltage value i.e 0.01099
• The switch is connected to a scope and gives 1 as output when on and 0 when off.
• The output of the switch is taken into another circuit of a DC motor and the DC motor runs when the switch is on.
• The parameters of the DC motor are kept as default and the output is obtained by using a ideal rotaional motion sensor block.
• The outputs of the switch and fan are given below in graphical form.

Output:

switch

fan