Vibrations and Structural Dynamics Test Facility (VSDTF)

 Overview:

Experimental structural dynamics is a very important subject for certification and modification of aerospace structures. Using the equipment, the dynamic behavior of the structure, in-terms of natural frequencies, mode shapes and damping values are obtained experimentally.  These test results would be used to compare, update and fine tune the mathematical model of the structure. Different types of excitations to the structure, such as, impulse excitation using instrumented hammer and forced excitation through electro-dynamic shakers can be applied to get the dynamic properties of the structure. Objective: The main objective of VSDTF

  • Determine the natural frequency of a free-free uniform rod with circular cross-sections.
  • Determination of modal characteristics of a uniform cantilevered beam of rectangular cross section and made of isotropic material.
  • Determination of modal characteristics of a square cantilevered beam of rectangular cross section and made of composite material.
  • Analyze  transient and forced vibrations of a swept cantilevered plate made of composite materials
  • Determine the modal characteristics of free-free wing model and observe the difference between symmetric and anti-symmetric modes.
  • Calculate free vibration characteristics of typical launch vehicle model using impulse excitation.
  • Vibration control using passive techniques (usage of constraint layer and viscoelastic layers.

Course Contents:

WEEK DAY CONTENT

WEEK1

DAY 1

Lecture: Introduction to structural dynamics / vibrations

DAY 2

Lecture: Introduction to the structural dynamic testing

DAY 3

Lecture: Introduction to the various equipments used during the test(Accelerometer, vibration generator, power oscillator, charge amplifier, data Acquisition card)

DAY 4

Experiment: Test article mounting techniques and cables connecting procedures

DAY 5

Experiment: Test methods – Impulse testing procedures using Instrumented Hammer
WEEK 2

DAY 6

Experiment: Test data acquisition and storing

DAY 7

Experiment: Data analysis: Introduction to Time data, frequency spectrum, auto spectrum, Cross spectrum, transfer function, real and imaginary plots, impulse response.

DAY 8

Experiment: Impulse test data analysis techniques and results tabulation

DAY 9

Experiment: Vibration testing using electro dynamic shakers, shaker location, force adjustment.

DAY 10

Experiment: Data acquisition and analysis procedures and storing of the results
WEEK 3

DAY 11

Experiment: Conduct of vibration test with different test articles

DAY 12

Experiment: Data acquisition and analysis and comparison with the theoretical predictions

DAY 13

Experiment: Spring Mass System: determine the damping coefficient of a single degree of Freedom system

DAY 14

Experiment: Determination of transmissibility ratio of a vibrating system

DAY 15

Review the above activities and concluding session

Outcome: EATF enable the students to

  • Investigate the Structural dynamics characteristics for components of Aircraft structure.
  • Understand the principle of structural dynamic / vibration testing
  • Familiarization of various equipments used in structural dynamic / vibration testing
  • Analyze test techniques and procedures to be adopted for different test specimens
  • Understand data acquisition and analysis procedures 
  • Analysis of Test results and compare with the theoretical predictions

Training fee and Duration: 3 weeks duration; From 4 PM to 6 PM.

Contact :

Prof TM Naidu
Professor & Programme Coordinator,
Department of Aeronautical Engineering
Ph No:9880717270
Email: tm.naidu@iare.ac.in

Gas Turbine Test Facility (GTTF)

Overview:
The purpose of this laboratory exercise is to demonstrate basic turbojet principlesusing actual pressure, temperature, fuel flow and thrust measurements from a small turbojet. Themeasurements available allow for the calculation of component efficiencies,compressor andturbine power, thrust, propulsive and thermal efficiency at various power settings.

Objective:
Main objective of the GTTFis

  • Understand the basic characteristics of axial flow gas turbine
  • Understand the range of performance of axial flow gas turbine
  • Analyze the component types and performance
  • Perform parametric jet engine performance analysis
  • Perform turbo machinery calculations
  • Perform basic combustion calculations

Course Contents:

WEEK DAY CONTENT
Week 1 Day 1 Lecture: Introduction to Gas Turbine Engines – Turbojet, Turbofan and Turboprop – Working, Component Efficiency etc.
Day 2 I Lecture: Introduction to Mini Gas Turbine – Start, Stop procedure, Individual Components, Explanations
Day 3 Lecture: Introduction to ARMSOFT software and integration of Gas Turbine CM14 & ARMSOFT
Day 4 Experiment: Study of Mini Gas Turbine Engine – Parts, Components, Working and Individual component efficiency
Day 5 Experiment: Starting and Stopping of Mini Gas Turbine
Day 6 Experiment: Engine Startup procedure and Shutting Down
Week 2 Day 7 Introduction to Axial Compressor – Design, Importance, Efficiency
Day 8 Experiment: Calculation of the Mechanical Efficiency of Axial Compressor – Power required, Power Available, Compression Ratio
Day 9 Introduction to Combustion Chamber – Types, Process, Output, Efficiency
Day 10 Experiment: Calculation of Work, Power and Thrust requirement in Gas Turbine – Combustion Power Input, Work Heat relationship
Day 11 Introduction to Axial Turbine – Work Output
Day 12 Experiment: Calculation of total work output of Axial Turbine – Output work necessary, Available output
Week 3 Day 13 Experiment: Calculation of Net Thrust, Specific Thrust and TSFC
Day 14 Experiment: Calculation of Thermal, Propulsive and Overall Efficiency of Turbojet Cycle
Day 15 Experiment: Elucidate T – S, H – S diagrams for the Gas Turbine and Compare efficiencies of non-ideal engine components.

Outcome:
The following outcomes are expected from the GTTF are

  • Name the major components of a Turbojet and define component parameters and work/heat interactions
  • Understand the combustor heat rate balance, associated assumptions and be able to estimate temperatures and fuel flow rates in the model gas turbine system
  • Understand the turbojet compressor requirements and perform mechanical efficiency calculations
  • Using the parameters and energy relations, estimate the specific thrust, net thrust, TSFC, thermal, propulsive and overall efficiency for the turbojet cycle
  • Understanding the modifications to the basic turbojet cycle including afterburning turbojet and turbofan
  • Analyze actual turbojet data taken from small turbojet and verify with estimated values
  • Perform basic turbojet and derivative cycle parametric analysis as detailed laboratory assignments

Training fee and Duration:3 weeks duration; From 4 PM to 6 PM.

Contact:
Dr P K Dash
Professor& Programme Coordinator,
Department of Aeronautical Engineering
Ph No: 9705803676
Email: drpdash@iare.ac.in

Flight Simulation Test Facilty (FSTF)

Overview:
Flight simulation laboratory hosts an engineering simulation based on simulink implementation of the equations of motion. Flight simulation is used for a variety of reasons, including flight training (mainly of pilots), the design and development of the aircraft itself, and research into flight dynamics and handling qualities. The use of flight simulators for training in complex and potentially dangerous situations (e.g. engine failure, systems failure, structural damage etc) is a critically important area in aircraft development.
In addition to the cockpit interfaced simulator, the flight simulation laboratory contains three PC based flight simulator. Of these, one is configured with hardware to simulate fighter type aircraft controls, another is configured to simulate general aviation type aircraft controls, and the third is configured to simulate a glider type aircraft controls. These three simulators have provision to incorporate the dynamics of other aircraft.  
Objective:
Main objectives of FSTF are

  • Provide a feel, how an airplane flies and performs maneuvers.
  • Recreating aircraft flight and the environment in which it flies, for pilot training, design, development, testing.
  • Understand the dynamics and demonstrate the control of flight vehicles.
  • Analyze the effects of aerodynamics derivatives.
  • Evaluate the parameters affecting the aircraft performance.
  • Demonstrate the significance of flight derivatives and its impact on aircraft dynamic response.

Course Content:

S.No Day Content
Week - 1 DAY 1 Lecture:
Introduction to flight simulator (Description of equipments used for real flight simulation).
DAY 2 Lecture:
Description about different aircraft models.
1) Commercial Aircraft
2) Fighter Aircraft
3) Sail Plane etc...
DAY 3 Lecture:
Description of controls used for flying aircraft i.e., connected Yoke and Rudder.
DAY 4 Experiment:
Interface between main pilot and co-pilot
DAY 5 Experiment:
Performing different mission segments of aircraft.
  • Take off
  • Cruise
  • Co-ordinate Turn
  • Land
DAY 6 Experiment:
Description about flight data collection from simulator for different flight operations and Revision.
Week - 2 DAY 7 Lecture:
Introduction to combat operations of an aircraft.
DAY 8 Experiment:
Performing combat maneuvers like Pull-up, Pull-down, Steady level turn.
DAY 9 Experiment:
Interface between main pilot and co-pilot. (In this students(co-pilot) are asked to stabilize the aircraft)
DAY 10 Experiment:
Performing different mission segments of aircraft in sequence.
  • Take off
  • Cruise
  • Co-ordinate Turn
  • Pull-up , Pull-down
  • Land
DAY 11 Experiment:
Flight data collection from simulator for different flight operations.
DAY 12 Experiment:
New design flight simulation

Outcomes:
A flight simulator is a potent combination, giving students the right and much needed practical experience through hardware.
The following outcomes are expected from FSTF are

  • Assimilate the effect of aircraft aerodynamic characteristics on the aircraft response and control.
  • Replicate the equations that govern flight physics, flight controls, and the effects of other aircraft systems: allowing them to appreciate the effect of turbulence, wind shear, precipitation etc.
  • Assimilate the cockpit environment, flight controls and displays.

Training fee and Duration: 2 weeks duration; From 4 PM to 6 PM.
Contact Person:
Dr M S Rajamurthy
Professor & Programme Coordinator,
Department of Aeronautical Engineering
Ph No: 9980594471
Email : ms.rajamurthy@iare.ac.in

Experimental Aerodynamics Test Facility (EATF)

Overview:

Aerodynamics is the epicenter of Aeronautical Engineering. Though the wave of Computational tools is still on a climb, Experiments are an irreplaceable tool to understand real world Aerodynamics. Experiments facilitate in understanding the real Physics by conducting tests on geometrically scaled models using the concept of dynamic similarity. Various techniques used in Experimental Aerodynamics include free flight tests, rocket sledge, Para-dropping, scaled model flying, wind tunnel testing.
Wind tunnel testing is the most viable and versatile tool to conduct the aerodynamic experiments. Department of Aeronautical Engineering at IARE is in possession of a low speed subsonic wind tunnel and all necessary allied equipment /instruments required for executing a glitch free environment academic research.       
Objective:
Main objectives of the EATF are

  • Perform flow visualization on any model under observation using a smoke generator and smoke rake
  • Evaluate all the three component aerodynamic forces and three component aerodynamic moments on any model with the help of 6-component strain gauge balance.
  •  Modify he experimental conditions on models for speeds up to 70m/s
  • Perform experiments on boundary layer growth using boundary layer rake
  • Flight Demonstration Model for demonstrating lift, landing and cruise with output of £ and tail angle interface
  • Encouraging innovative projects to stretch the scope of aerodynamic experiments in the academia
  • Expand the horizons of the facility to be utilized by the aeronautical fraternity of local, regional & national domains.

Course Content:

WEEK DAY CONTENT
WEEK1 DAY 1 Lecture:
Introduction to importance of experiments in Aerodynamics and various types of aerodynamic experiments
DAY 2 Lecture:
Fundamentals on aerodynamics: Theory, Assumptions, Governing equations, Dynamic Similarity,
DAY 3 WALK THROUGH of experimental aerodynamic test facility
Lecture (in Lab):
Introduction to Component wise contribution of wind tunnel and flow quality in the tunnel, estimating the loss factor of various components and estimation of turbulence levels in the test section.
DAY 4 Lecture:
Usage of tools like pitot static tube, manometer (Range and sensitivity of tools)
Experiment:
  1. Calculating loss factors of each component in the tunnel from measurement of the geometry

2. Calibration of wind tunnel: Usage of pitot static tube and cross validating using air speed indicator over a range of capability of wind tunnel

DAY 5 Experiment:
3. Estimating the flow quality in the test section using a 2D/3D traverse mechanism
4. Calculation of boundary layer using the boundary layer rake in the test section
WEEK 2 DAY 6 Lecture:
Standards and practices in Model Sizing and fabrication.
DAY 7 Experiment:
5. Flow analysis over a circular cylinder and Cp distribution over the cross section over a range of speeds and plotting manually for one case.
DAY 8 Lecture/Workshop:
Signal & Data Processing using MATLAB  Develop a code that takes the input of manometer reading, calculates the Cp, at the pressure taps and fits the curve for Cp & computes  Cl, Cd.
DAY 9 Experiment:
6. Flow analysis over a Sphere and Cp distribution over the cross section over a range of speeds and plotting manually for one case.
Assignment: Code development as similar as in the case of circular cylinder
DAY 10 Analysis on the error in the experiment in comparison with potential theory
Experiment:
7. Smoke Visualization of flow over cylinder, sphere, and estimation until which Reynolds number the potential theory fits well, thus reasoning the deviation from potential theory.
WEEK 3 DAY 11 Lecture:
Theory of airfoil, assumptions, intricacies in sync to reality
DAY 12 Experiment:
8. Flow analysis over a symmetrical airfoil, estimation of Cp distribution over the cross section and estimation of Cl & Cd by developing a Mat lab code and comparing with theory.
DAY 13 Experiment:
9. Flow analysis over a cambered airfoil , estimation of  Cp distribution over the cross section and estimation of Cl & Cdby developing a Mat lab code and comparing with theory.
DAY 14 Experiment:
10. Evaluation of Cl & Cd for a symmetrical airfoil & cambered airfoil using 6 axis strain gauge balance over a wide range of angle of attack and at different speeds and fit the curve using Mat lab
DAY 15 Experiment:
11. Flight Demonstration and estimation aircraft loads while takeoff, climb, cruise & landing with help of an R/C aircraft model mounted on 6-axis strain gauge balance.

Outcome:
The following outcomes are expected from the EATF are

  • Students are expected to gain experience in intricacies in performing aerodynamic experiments that are helpful in their career both industry and higher education.
  • Research scope for faculty in experimental aerodynamics is anticipated to expand.
  • Aeronautical fraternity will have a collaborative research across local, regional and national domain.
  • Research projects from R&D establishments like NAL, DRDL, ADA, ADRD, ISRO could be secured.

Training fee and Duration:3 weeks duration; From 4 PM to 6 PM.
Contact Person:
Dr A Barai
Professor & Programme Coordinator,
Department of Aeronautical Engineering
Ph No: 8886033312
Email: a.barai@iare.ac.in