Ask Question, Ask an Expert


Ask Mechanical Engineering Expert


Section 1

An antenna shown in Figure is to be adjusted from its current position to a new desired position through turning a potentiometer at an angle θi(t). The potentiometer converts the angular displacement in voltage. Another potentiometer is employed to convert the angular position of the antenna in voltage which then serves as a feedback system. The differentiation between the voltage outputs from the two potentiometers is amplified in two stages to supply a proper voltage level to a motor driving antenna. The system normally operates to drive the error to zero i.e. when the input and output voltages (produced through the potentiometers) are equivalent, the error will be zero and consequently the motor receives no voltage and halts to drive the antenna. In this control process, apply the six (6) steps to model and analyse the given system by which the following items shall be subsequently produced.

a) Block diagram
b) Schematic diagram
c) Simplified diagram 
d) The transfer function of the system θ0 (s)/θi (s)
e) The plots of the system responses while working on the design analysis.
f) Discussion on the following cases:

i. If the gear diameter attached to the antenna is increased, what is the effect on the system response and why? 
ii. If the system is ensured to be always stable and that the steady-state error is kept at zero, what are the appropriate measures? 
iii. If strong wind strikes unequally across the face of the antenna plate, how will it affect the response of the system? What is the appropriate method to overcome a problem it creates?

Note: for the above three cases, prove your explanation and illustration with appropriate evidences in terms of numerical values and plots.

Section 2

Design a compensator such that the step response of the system yields the following changes:

• The percent overshoot shall be reduced by 50%
• The settling time shall be reduced to 3.0 sec.

Note: Should you not be able to satisfy the given specification with one type of controller, you may use other type. Any particular technique in the design procedures is left for you to decide. You must produce all the evidences of your work in the form of numerical values and plots.

931_layout of atenna.jpg

Parameter Name                         Value
Differential Amplifier gain:              2
Power amplifier Gain:                   100
Power amplifier frequency shift :    50
Armature Resistance:               10 k Ω
Rotor Inertia:                       0.03 kg-m2
Rotor damping:                 0.02 N.m s/rad
Load Inertia:                          4 kg-m2
Load damping:                    2 N.m s/rad
Back emf constant:                1 V.s/rad
Motor Torque Constant:          1 N.m/A
Gear 1 number of Teeth:             40
Gear 2 number of Teeth:           200
Gear 3 number of Teeth:           250
Input Potentiometer Gain:         2.0
Output potentiometer Gain:      1.5



prepare a report of minimum 20 pages covering the following content:

• Introduction           
• Derivation of the system model                  
- Differential Equation
- Laplace transform 
- Transfer function 
• Analysis of the system response  
- Manual calculation
- Simulation result
- Discussion of the simulation results
- Illustration and discussion on the case problems
• Control Design and Analysis                  
• Conclusion

Mechanical Engineering, Engineering

  • Category:- Mechanical Engineering
  • Reference No.:- M91216

Have any Question? 

Related Questions in Mechanical Engineering

To pay off 50000000 worth of new construction bonds when

To pay off $50,000,000 worth of new construction bonds when they come due in 20 years, a water municipality must deposit money into a sinking fund. Payments to the fund will be made quarterly, starting three months from ...

Application circular-loop receiving antenna a small

Application: Circular-loop receiving antenna. A small circular loop of radius a is used as a receiving antenna. The antenna is placed at a distance R in the field of an isotropic antenna which radiates P [W] at a frequen ...

Application lambda2 dipole a half-wavelength antenna is

Application: λ/2 dipole. A half-wavelength antenna is made of copper wire with conductivity σ = 5.7 x 10 7 S/m. The antenna is 3-mm thick and 1.5-m long. (a) Calculate the impedance of the antenna and its efficiency when ...

Find the transverse components for a backward-propagating

Find the transverse components for a backward-propagating TM wave in a rectangular waveguide of width a and height b. Assume the backward-propagating wave propagates in the negative z direction and the amplitude of the w ...

Use sigma and 1p to denote summation and integration

Use Σ and 1/p to denote summation and integration, respectively. Draw a time domain block diagram for two coupled windings with saturation and (a) with leakage inductance and (b) without leakage inductance.

Develop a test procedure to check the circuit board in

Develop a test procedure to check the circuit board in Figure 82 to make sure that there are no open components. You must do this test without removing a component from the board. List the procedure in a detailed step-by ...

Consider the voltage regulator circuit shown in figure 221

Consider the voltage regulator circuit shown in Figure 2.21. From the information sheet for the diode, it is known that at the operating value of the voltage regulator, which is 20 V and is beyond the breakdown voltage, ...

What is the main advantage of including hysteresis in a

What is the main advantage of including hysteresis in a switching element? What is a Schmitt trigger? Describe the operation of the Schmitt trigger circuit that employs two bipolar junction transistors as in Figure 8.19a ...

When the gear rotates 20 revolutions it achieves an angular

When the gear rotates 20 revolutions, it achieves an angular velocity of ? = 30 rad/s, starting from rest. Determine its constant angular acceleration and the time required

Application the short dipole antenna a short dipole is a

Application: The short dipole antenna. A short dipole is a dipole that is too long to be considered a Hertzian dipole but too short to be an arbitrarily long antenna. This usually means an antenna between λ/50 to λ/10 in ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate