Week -2

A.Make a Simulink model of Doorbell using solenoid block with the following details

Ans- To implement the model of door bell using solenoid block we have to use different types of blocks following blocks we have to use

Blocks we used- Pulse Generator , Battery Source, Switch, Solenoid Block , Electrical Reference, ideal translational motion reference, Solver Configuration , Mechanical translational reference,Scope.

Functions of block

Pulse Generator-Pulse generator is used for providing pulse to the switch.

Switch-Switch is used to controlled the cicuit.

Simulink to PS Converter and PS to Simulink Converter- It is used for to convert the simulink signal to physical signal or vice versa.

Battery- It is used for providing the supply to the model.

Electrical reference- It is used to ground the electrical connection to ground

Scope-Scope is used to dispalt the output.

Ideak translational motion sensor-It is used to detect the mechanical force.

Mechanical Translational reference-It conncet all mechanical common point.

Working-

1. In this model we are using solenoid which converts the electical energy into mechanical energy by using electromagnet effect.In solenoid when we inject the current through solenoid coil gets enegised and developed the electromagnetic field so that the coil sense the force.

2.As per below model solenoid is connected one terminal to battery and second terminal to the switch and moving teminal is connected to the ideal motion sensor to sense the mechanical force and spring is connected to the translation reference like wise the circuit is completed.

3.By using pulse generator we can turn off and on the switch by giving the pulse to the switch. After turn on the switch circuit gets completed and current flows through the solenoid and moving part of the solenoid experience the force by using ideal force sensor and gices us the desired output.

4.After switch gets turn off plunger experience the reverse force and it heats the bell.

Simulation model of doorbell is as follow

Please find below simulation result of above model.

B.Use a thermistor to sense the temperature of a heater & turn on or turn off the fan as per the below conditions.

Ans-

1. To make simulation model of thermistor to sense the temp sensor we are using thermistor as main parameter we used various blocks such as signal builder, Controlled temp source,baterry, voltage sensor , resistance,electrcial reference ,PS to Simulink Converter ,Scope , Simulink to PS converter , Switch.

2.In this we are using NTC ( Negative temperature coefficient ) type thermistor . In NTC thermistor as temperature incrases resistance value is decreasing.

In this resistance and temperature are inversly proportional to each other.

Working as follow-

1. By using given condition we have to configure the signal builder block with given time and temperature. Then signal builder block passes the signal to controlled temperature source through PS to Simulink converter block.

2.Controlled temperature block control the temp according to temperature accross the two terminal and then it connected to thermal point of thermistor.

3.Also thermistor is connected to battery after that resistance is also connected in the series to the thermistor across that voltage sensor is connected after that scope is used to measure the voltage.

4.And then output signal of voltage sensor is used as threshold value to the switch as the value of input signal is greater than the threshold value then and then only switch will turn on otherwise off which gives output the scope and scope is used to display the output.

As per our condition when the temperature is above 25 degree celcius fan is ON.

Please find below simulink modeule

The result of model is as follow