Week -2

1.Simulation Model For Doorbell

Model Explanation : First we have use the following block for this model i.e.pulse genrator, switch, battery, solenoid, ideal translational motion sensor, mechanical reference, electrical reference and scope. The Pulse generator is used send pulse at regular interval. As per condition the bell is activated when solenoid is attracted to plunger for 2 sec and then relesed for 2 sec. The time period as 4sec and Pulse width as 50% of 4 sec. After that signal is recieved from pulse generator it is converted via simulink-ps converter and given to switch as an input. In series with solenoid a battery & switch is connected. The R port of solenoid is connected to ideal translational motion sensor which observes the movement of the plunger. Both mechanical and electrical reference are connected to the respective circuits. The output from ideal translational motion sensor is again converted using ps-simulink converter & we get the output in scope.

Fig:1

Fig:2

Fig:3

As shown in figure 2 I've changed the damping value to 6. As it reduces the noise at the instant of switching.

Result : From Fig 3 we can see that at every 2 seconds of interval the bell is activated.

2.Simulation Model For Thermistor

Model Explanation : First we have taken all the required blocks needed for our simulation. The signal are set to a given temperature condition in signal builder which are then in the form of simscape through simulink-PS converter and applied to controlled temperature source block through thermistor. Further the resistor is connected & across which voltage source is connected. Here thermistor & resistor is provided with a battery voltage. After that it will convert again into PS-simulink converter and applied to switch. The switch having 3 input and 1 output. Th middle one is connected from PS-simulink converter and other two input for condition i.e. 1 = On and 0 = OFF.

Fig 1

Fig 2

Result : Simulation is run at 50sec and we will get following output.