Creative Engineering Projects: 3rd semester

Showing posts with label 3rd semester. Show all posts

Speaker Recognition using Matlab

By Creative Engineering Projects on 11:18 in 3rd semester, engineering project, MATLAB, Signals and Systems

Ø ABSTRACT:

· The project recognizes the input data spoken by the speaker by comparing it with the reference data.

· It involves having Fast Fourier transform of the given speech then normalizing the frequency signal.

· Finally, the reference and the given data are compared and the result is displayed depending on the variation in the input speeches.

Ø WORKING OF MODEL:

Ø MATLAB CODING:

Ø Coding for Input:-

data=data(1:600);

fy=fft(data);

fy=fy.*conj(fy);

tn=fy/sqrt(sum(abs(fy).^2));

Ø Coding for Comparasion:-

s=sqrt(sum(abs(f-d).^2));

if s<2*1

result=strcat('HELLO!!!');

result

else

result=strcat('YOU ARE NOT');

result

end

OPTO-THERMO CONTROL RELAY SWITCH

By Creative Engineering Projects on 09:23 in 3rd semester, engineering project, ic555, LDR, optoelectronics, relay switch

1. ABSTRACT:

Ø The circuit shows the working of opto-control switch, where LDR is used as a switch to open and close the circuit.

Ø 555 timer IC is used as a comparator.

Ø The product of RC is used to produce the delay in the IC and affects pulse propagation through it.

2. COMPONENTS:

Ø Resistors (1k,47k,10k)

Ø Capacitors (2*.01uF, 1*4.7uF)

Ø IC LM555

Ø LDR (500 ohms)

Ø Speaker (8 ohms)

Ø Battery 9V

3. CIRCUIT DIAGRAM:

Ø In P-Spice:

4. OUTPUT RESPONSE:

Ø When Light is not falling on LDR:

· Voltage:-

· Current:-

Ø When Light is falling on LDR:

· Voltage:-

· Current:-

5. APPLICATIONS:

Ø Used in parking system. When the car comes near the gate of garage, the parking lamp glows and the gate opens as the light falls on the LDR and the current passes through the circuit.

Ø Security alarm

ANALYSIS OF CHARACTERSTICS OF 3-PHASE INDUCTION MOTOR

By Creative Engineering Projects on 10:28 in 3-phase induction motor, 3rd semester, engineering electromagnetics, engineering project

1. INTRODUCTION:

v A 3-phase induction motor consists of a stator and rotor.

v The stator carries a 3-phase winding (called stator winding) while the rotor carries a short circuited winding (called rotor winding).

v Only the stator winding is fed from 3-phase supply.

vThe rotor winding derives its voltage and power from the externally energized stator winding through electromagnetic induction.

2. COMPONENTS OF INDUCTION MOTOR:

1.) Rotor..

v The rotor, mounted on a shaft, is a hollow laminated core having slots on its outer periphery.

v The winding placed in these slots (called rotor winding) may be one of the following two type :

¡ (i) Squirrel cage type

¡ (ii) Wound type

2.)Stator..

v It consists of a steel frame which encloses a hollow, cylindrical core made up of thin laminations of silicon steel to reduce hysteresis and eddy current loss.

v A number of evenly spaced slots are provided on the inner periphery of the laminations.

v The insulated conductors are placed in the stator slots and are suitably connected to form a balanced 3-phase star or delta connected circuit.

3. WORKING OF INDUCTION MOTOR:

v When the stator windings are connected to a three-phase power supply and rotor circuit is closed, the induced voltage in the rotor windings produce rotor currents that interact with the air gap field to produce torque.

v Rotor, if free to do so, will start rotating.

v This field is such that its poles do not remain in a fixed position on the stator but go on shifting their positions around the stator.

4. THE VARIOUS METHODS OF SPEED CONTROL OF 3-PHASE INDUCTION MOTOR:

v Pole Changing

v Variable Supply Frequency

v Variable rotor resistance control

v Variable supply voltage control

5. ADVANTAGES OF 3-PHASE INDUCTION MOTOR:

v It has simple and rugged construction.

v It is relatively cheap.

v It requires little maintenance.

v It has high efficiency and reasonably good power factor.

v It has self-starting torque.

v In fractional-horsepower (less than 1hp) applications, the single-phase motor will be less efficient.

6. BLOCK DIAGRAM in SIMULINK:

7. BLOCK PARAMETERS:

8. MATLAB-SIMULINK ANALYSIS:

ØROTOR SPEED(rad./sec.) and ELECTROMAGNETIC TORQUE(N*m)

§ @(415V ,50 Hz )3-phase Voltage Supply

ØSTATOR CURRENT(A) and ROTOR CURRENT(A)

§ @(415V ,50 Hz )3-phase Voltage Supply

ØSTATOR CURRENT(A) and ROTOR CURRENT(A)

§ @(415V ,60 Hz )3-phase Voltage Supply

Ø ROTOR SPEED(rad./sec.) and ELECTROMAGNETIC TORQUE(N*m)

§ @(415V ,60 Hz )3-phase Voltage Supply

SIGNAL AMPLIFIER

By Creative Engineering Projects on 08:53 in 3rd semester, analog electronics circuits, engineering project, signal amplifier

1. ABSTRACT:

The circuit shows a 3-transistor voltage amplifier suitable for a variety of projects including receivers, intercoms, microphones, telephone pick-up coils, and general audio monitoring. The values are not particularly critical and modest deviations from the indicated values will not significantly degrade the performance.

2. COMPONENTS:

· Resistors

· Capacitors

· Transistors(Q2N2222)

· Voltage Supply(DC)

· Input Voltage(Vsin)

3. WORK OF EACH COMPONENT:

· Resistors:

In the given circuit resistor R5 is working as an Rs. It is also used to improve amplifier. R6 and R7 have such a high resistance values, so that whole current which is coming from source go to the base of the Q2. R10 and R11 also have high resistance values for same reason. R12 is Rc(collector resistance) of Q3 and R13 is Re(emitting resistance) of Q4. R14 is load resistance.

· Capacitors:

Capacitors are used for pass the AC current and block the DC current. C5, C6 and C8 are working to prevent the ac current to directly hit the DC supply.

· Transistors:

All the 3 npn transistors work to amplify and stabilize the input signal.

· Voltage Supply(DC):

Dc supply is given to put all the Transistors into cut-off region.

· Input Voltage(Vsin):

To give the minute input sinusoidal signal.

4. CIRCUIT DIAGRAM:

5. WORKING OF CIRCUIT DIAGRAM:

A minute sinusoidal wave is given to Q2 which is brought into cut-off region by Vdc and hence amplifies the signal. The signal then is carried forth to the next pair of transistors which stabilize, modulate and further amplify the signal the output at the emitter of Q4 is fed to C9 which across the R14 is the final output.

6. OUTPUT RESPONSE: