Week -2

AIM : To create a simulink model of door bell using solenoidal block.

simulink;

simulink is a MATLAB based graphical program for modeling .simulink blocks in matlab provide the interface of the function callers were we can call a function callers  where wee can call a function to get the results and plt for the function output

OBJECTIVE:

1.Whenever the switch is closed the electromagnet receives electric power from  the battery and pulls the metal arm to hit the bell producing sound

2.creating a situation where the switch is closed for 2seconds then released the observer the physical movement of the plunger

block used:

1.PULSE GENERATOR
2>SWITCH>
3.BATTERY

4.ELECTRIC REFERENCE

5.Solenoid

6.Mechanical Translational Reference

7.Ideal Translational Motor reference

8.MEchanical Translational Reference

9.solver configuration

                          fig: simulink block diagram

INPUT PULSE RATE:

cycle time is 4 seconds bur pulse given 2 sec as condition The graph will shown in fig

OUTPUT PUSE RATE:

here we can sense the physical moment of the plunger as result shown in below grapg

2.using a thermister to sense the temperature of a heater and turn on/off  the fan as per given conditions 

sigal builder input:given input as per the  given conditions

GIVEN INPUTS

AT point 1: time 0 seconds ,temperature 293K

at point 2: time 10 sec temp:293K

at point3: Time 10 sec,Temp:300K

at point 4: Time 30 sec,Temp:300K

at point 5:time 30 sec,:temp:296K

at point 6:time 50 sec,temp :296K

CONTROLLED TEMPERATURE SOURCE:  its represents an ideal source of thermal energy that is powerful enough to maintain specific temperature differences across the source regardlesss heat flow consumed by the system connections A andB are thermal conservational ports corresponding to the source inlet and outlet and port S is physical signal port then the control signal drives the source is applied.

THERMISTER:

 it is a type of a resistor it is dependent on temperature  more so than the resistor  the word is a combination of thermal and resiststor

THE Thermistor block represents NTC-thermistor using  B-parameter  equation 

NTC=negative thermal co efficient

RESISTOR:

V=IR 

v=voltage,R =resistence,I=current in ohms

Voltage sensor:

this block implements AC/DC  voltage sources and noise compplements

ELECTRIC REFERENCES:

this block reprents is an electric ground.electrical conserving ports of all the blocks are directly connected to ground and connected to an electric references block.A model with electric elements must contain atleast one electric reference block

 EXPLAINATION MODEL:
 

inputs are given to the suignal builder and connected with temperature  controlled source for maintaining the specific temperature  difference across the source  the input temperature flows through thermister .Thermister is connected with resistence connected with positive terminal or the voltage across the resistor is given by v+,v-ve and the sign of the current is positive when  flowing through device from positive to negative terminal the power absorbed by a resistor always positive  connect the positive terminal of the thermistor  and connect the negative  terminal of the voltage sensor and resistor  to get the values from the voltage  sensor like series connection

output terminal ofthe voltage sensor connected with switch.using switch parameter for giving condition as fan  must be on if the temperature above 25 degrees centrigrade , Off otherwise.Output  is successfully executed by connection with scope as per given conditions as we give

OUTPUT 1:

                           plot result-1

in above fig showing arrangement giving input as time period2 seconds in the pulse generator toopen and close the switch .switch is closed the solenoidal block receives electric power from the battery plunger  moves from port R to Port C to hit the bell and producing sound

physical movement of the plunger is observed by used ideal Translational motion sensor and physical output is converted  in to simulink output is display in scope .reducing the spring constant value  and increasing the damping value and vibrations will be reduce

STUDY2

                 RESULT 2

here 0-10 seconds fan is off condition because temperature is 293 kelvin which is below 298K. After 10 secs temperature goes  300K ,so fan will turn on  because temperature exceeds 298K.after 30 seconds fan will be turn off because temperature goes on 296K which is below 298K 

from the above results the given condition has been achieved and succeessfully executed output as well as i want.