This presentation showcases the research work carried out by me under the able guidance of Dr. Rajkumar S. Pant at the Lighter-than-Air laboratory at IIT Bombay
1. R&D of Lighter – than – air systems
Amool A Raina
Project Engineer
Aerospace Engineering Department
Indian Institute of Technology Bombay
April 23rd , 2009 R&D @ LTA IITB
2. Research Work undertaken
PADD Program Multi disciplinary Trans Brahmaputra
Shape Optimization Airship Ferry
E-Gift Aerostat Analysis of Airships Knowledge based
Program using FSI tools Engineering Approach
for Airship Design
5. Program on Airship Design & Development
Establish Feasibility
Operation, Design & Development of Airships in India
Promote Usage
Multiple roles; Pax/Cargo, CasEvac, Tourism, ………
Develop Technology Base
Enhance existing expertise in Parachutes & Aerostats
Explore avenues of Joint Development
National & Global Partners
Private Sector participation
6. Tasks Completed in PADD
Project Definition Report for Development of
Demo airship & PaxCargo Airship
Payload = 100 kg & 1500 kg
@ Hot (ISA+15) and High (3500 m) conditions
Operation at lower altitudes to be explored
Establishing feasibility of leasing a few
airships
8. Design, Fabrication & Testing of Remotely
Controlled Airships
As a part of ongoing PADD Project
9. Micro Airship
Volume = 6.8 m3
Payload = ~ 1 kg
Max. Speed = 25 km/h
Endurance = 15 min with 200 ml fuel
No. of Flight days = 4 at IIT Gymkhana
10. Mini Airship
Volume = 8.64 m3
Payload = ~3.0 kg
Max. Speed = 36 kmph
Endurance = 15 mins with 300
ml fuel
No. of Flight days = 6 at Pune,
Bangalore, Coimbatore
12. Multi disciplinary Shape Optimization
Axis-symmetric Bodies of
Revolution with application to
airship and aerostat
envelopes
Three Disciplines
Aerodynamics
Structures
Manufacturability
20th December
13. Results of Initial studies
GNVR
Least Drag
Least Surface
Least Stress
Overall Best
Profile
20th December
15. E- Gift Aerostat Design Project
Sponsored by One World South Asia
20th December
2007
16. Schematic of Aerostat Communication
System
Aerostat
Omni Directional
Base Antenna
10km
50-100m
Client
antenna
PoE Cable
Router Board Winch with
Power Supply LTA
20th December
17. Envelope Profile
Profile
Aerostat Profile with Petal and Fin Fin Geometry
Single Petal
12.00 Single Petal Bottom
Petal Weld Margin
10.00
8.00
Radius (m)
6.00
4.00
2.00
0.00
0.00 2.00 4.00 6.00 8.00 10.00 12.00
Length (m)
18. Tether Profile under wind loading
120.00
100.00 15 m/s
10 m/s
5 m/s
80.00
Height (m)
60.00
40.00
20.00
0.00
0.00 20.00 40.00 60.00 80.00 100.00 120.00
Blowby (m)
28. Knowledge Based Engineering
(KBE)
KBE is defined as engineering on the basis of electronic
knowledge models.
Knowledge models can be imported or stored enabling
engineers to create designs on the basis of the knowledge in such
models
Highly adaptive to various design problems.
Makes the design process highly iterative in nature.
29. KBE Approach for Airship Design
Specific methodology is developed based on High Level
Primitives (HLP).
In case of an Airship the HLP’s consist of fully parametric
models of the various segments of an airship.
30. KBE Approach Cont….
Based on the above inputs the volume and payload requirements are
then calculated.
Now, by changing a few input dimensions the Airship can be
customised to customer’s needs of ‘Payload Requirements’
31. A typical Output from KBE
Approach
17th April 2008 R&D @ LTA IITB - PPT For IITM
32. Conceptual study of unmanned
high altitude aerial platforms
• For scientific research by SASE
• Applications
• Real-time monitoring of avalanche parameters at the
upper Himalayas
• Observation of work-in-progress at the tunnel
33. Design of an aerostat for aerial
observation at Dhundi
Mandate
Conceptual design and sizing of an aerostat
meeting SASE’s operational requirements
Generate documents and fabrication plans
using which the aerostat can be fabricated
by an industry partner decided by SASE
Scaled prototype of the system to be fabricated
and tested through a field trial
by an industry partner decided by SASE
35. Fluid Structure Interaction - FSI
FSI refers to problem solving using equations which govern the
motion of fluid and structure particles during their interaction.
Various Methodologies used are:
FSI Modeling Models
Fully Coupled Model
Loosely Coupled Model
Closely Coupled Mode
ALE (Arbitrary Lagrangian Eulerian)
IFEM (Immersed Finite Element Method)
Fluid domain assumptions
Solid domain assumptions
The overlapping domain
FD (Fictitious Domain) Method
Fluid and Structure Coupling Mechanisms
36. Analysis of Airships using FSI Tools
Consists of three Stages:
Stage 1:
Structural Modeling of Airship Body using FEM
package called ABAQUS
Stage 2
Generation of Aerodynamic model
using VSAERO
Stage 3
Coupling of VSAERO and ABAQUS
models
37. This presentation showcased my work at IIT
Bombay carried out by me from 2007-2008
If interested, please contact:
amoolraina@gmail.com
20th December
2007