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1. supradip das
( portfol^o )
M.Des ( Industrial design )
Indian Institute of Technology Guwahati

2. “
We are all ready complicated beings. Education
So my objective is to make surroundings
simple through Industrial Design.
“ M.Des [ Pursuing ] Indian Institute of Technology Guwahati
CPI 9.52 ( till date )
B.E(Mechanical Engineering) Priyadarshini College of Engineering, Nagpur University
75.15%, Distinction, University Topper, Position 10th
Diploma(Mechanical Engineering) West Bengal State Council of Technical Education
Distinction
Working Experience
Graduate Engineer Trainee (1 yr) Tata Auto Comp Systems ltd., Pune
Kaizen Award Winner
Summer Internship May’10-June’ TYCKA Design Pvt. Ltd.
Washing machine designed for Hindustan Unilever
Summer Trainning May’08-June’08 ONGC India Ltd.
Summer Trainning Dec’07-Jan’08 Minar Hydrosystems, MIDC Hingna
Designed Hydraulic Cylinder for TISCO
personal i Software Skills
prof^le Soloworks, Pro-E, Auto CAD,
Adobe illustrator, Adove photoshop, Adobe indesign
Microsoft Office 2007

3. 1.0 hovercraft for rescue ( on going Master Thesis Project )
Design Brief Design Challenge Mood Board for Ideation
Flood in India causes maximum number
of death of people among all disaster. It
has been observed that flood rescue
vehicle used by Indian ARMY, Indian
AIR FORCE, Indian NAVY and NDRF are
not safe from crew point of view and also
from victim point of view. Those vehicles The limitations of any boat are of two kinds.
can not achieve target when water current Firstly, the physical limitations built into the
is more then 8 knot and water is full of wave boat by the designer and by the motor
and wake. Those vehicles also can not installed on the boat.
overcome water hazards during flash flood Secondly, safety limitations.
or similar kind of disasters.
Design a vehicle which will be useful for
rescue as well as transportation also. C P
S
Design Research IAP Air cushion
M
Types of flood
Stages of flood
Flood water behaviour
Flood hazards
Existing flood rescue vehicle in India
Limitation of existing rescue vehicles I am taking into consideration the force,
Rescue vehicles in the world pressure and moment created in spine
Hi speed water vehicle type of a crew during rescue.

4. 1.1 hovercraft for rescue ( on going Master Thesis Project )
Technical Specification bordered ray fish Inspiration Sketches
Hull dimension
Length: 24 ft Breadth: 10 ft
Height: 2.5 ft Weight: 5582 lb
Wave capability: 2 ft
Material: High density polyethylene
Speed: 36-54 ft/s
Skirt Material: Hypalon
Type: Combination of coated porous bag
type and enclosed bag type.
Control system: Automotive steering wheel
with fingertip thrust pitch
buttons
Marine cable operated
steering rudders.
Lift System-
Speed of Engine: 3600 rpm
Engine HP: 48 hp
Number of Fan blade desired: 9
Drag System-
Approximate lift to drag ratio: 1.6
Total thrust required: 3488.75 lb
Total Power required: 346.84 hp
No of blade: 5

5. 1.2 hovercraft for rescue ( on going Master Thesis Project )
Pressure Plot Velocity Plot CFD Analysis
X component of Force (Drag)
160000
140000
120000
X - Component of Force [N]
100000
80000
GG X - Component of Force 1
60000
40000
20000
-1E-11
0 50 100 150 200 250 300 350
Iterations
Pressure Trajectory Velocity Trajectory
Y component of Force (Lift)
1000
0
0 50 100 150 200 250 300 350
-1000
-2000
Y - Component of Force [N]
-3000
GG Y - Component of Force 1
-4000
-5000
-6000
-7000
-8000
Iterations

6. 1.3 hovercraft for rescue ( on going Master Thesis Project )
3D Rendering

7. 2.0 spy plane ( Bachelor Thesis Project )
Design Brief Design Challenge Mood Board for Ideation
Sometimes anti social element captures * Gliding capability
the sensitive areas. In this situation our * Illusionary
soldiers are helpless to fight with elements. * Unidentifiable
* Untraceable
Our proposed spying object will definitely * Unmanned
help our soldiers in crucial situations.
Our flying object will have the following Used flat aerofoil theory
features -
• Disc Shape, so that radar can’t detect it. frisbee
• Better gliding capability.
• Can take off in less space.
• Can be used as spying purpose. Air flow having no viscosity has zero drag
We are designed, fabricated and tested our and no lift.
object theoretically as well as practically as
far as possible.
Vortex created
Design Research
Types of aircraft
Aerofoil nomenclature If we suddenly turn the viscosity on, the
Flight lift theory flow about our flat-plate airfoil will begin to
Modren sail theory change. The viscous boundary layer will
Existing spying object in India start to form on the surface. The viscous
Dynamics of air vehicle air will create a vortex which will turn down
Spy plane character the tailing edge and leading edge up. And a
Aircraft anatomy magic lift starts.

8. 2.1 spy plane ( Bachelor Thesis Project )
Untraceable as radar 3D Rendering
is unable to trace disc shape
Equipped with
remote sensing
cameras
No flap, no Above some altitude flying
aileron. disc creates the illusion of
Only elevator. some UAV’s or strange
birds in the minds of the people.
Large wing span with a disc shape
can be really helpful to glide through air for
Twisting twin engine helps to take off vertically a long time.

9. 2.2 spy plane ( Bachelor Thesis Project )
Technical Specification Prototype
Body dimension
Diameter: 1 meter
Thickness: 1 inch
Material: High density thermocol
Engine
Type: Glow plug engine
Control system: Remote operated servomotor
driven.
Weight: 450 gm
Lift System-
Speed of Engine: 16000-17000 rpm
Engine HP: 0.7 bhp
Number of Fan blade desired: 2
Drag System-
Approximate lift to drag ratio: 9.166
Total thrust required: 3.746 N

10. 3.0 sit ski for physically disabled ( lower limb )
100°
Design Brief 37°
Sitting Posture Ergonomics
According to easy sitting posture
Many people with mobility limitations can’t
Upper lumber height defined by Ohara
enjoy participating in winter recreational
25th percentile and Indian Anthropomentric Data
277
activities. In order to enjoy the alpine ski
slopes, wheelchair users and others who 429 120°
have lower limb limitations need skiing 120°
equipment that can be used in a seated
position.
46°
Design a sit ski which is ergonomically Buttock to popliteal length
360
comfortable and absorb shocks due to 25th percentile
damping on the way of ski.
Stress Displacement Simulation and Modification
Displacement reduced by
spring lock
Maximum Stress 4.41738e+007 N/m^2 Maximum Displacement 1025.22 mm Stress reduced by shock absorber
Stress Simulation Displacement Simulation Modification

11. 3.1 sit ski for physically disabled ( lower limb )
3D Rendering
Silicon cushion for comfort
Kevlar composite for lighter body
Greatest range of peple can sit
Lower center of balance Without pivot frame design

12. 4.0 futuristic bicycle
Design Brief Sitting Posture and Handle Ergonomics
( Possible sitting postures with this bike
Bicycles are generally divided into
and handle grip style )
Mountain bicycle ( also called cross-
country bicycle ) and Road bicycle
( also called road ster or racing bicycle ).
My primary objective is to combine both
the cycle features and to give aesthetic
look in general. Secondary objective is to
design an ergonomic handle which will
give rider comfort and safety.
Tour/MTB/Hybrid Comfort/Cruiser Dutch
Static, dynamic and cyclic loading on a Conventional design My Innovation Technical Innovation
bicycle frame to avoid torsion, bending and compression Invisible spring for shock absorb
One end
connected
Rider weight
to Frame
Another end
connected
Bending fron to Chain
breaking or Stay
crashing
Rider weight
Pedalling
torque Inside front deraillure cover
coil spring to reduce
Shock absorber and linkage to reduce pedalling torque and
Load from road to resist shock
torsion on Seat Stay and Top Tube Road reaction

13. 4.1 futuristic bicycle
Ergonomic handle with three different 3D Rendering
possible position
Unpatented brake system
Advanced rim cross-section
Unpatented suspension system Integrated mud guard
Dresses, loose clothes and children’s feet
Without seat stay frame are safe from the rear wheel and chain guard

14. 5.0 failure mode effect analysis of plastic chair
Analysis Brief Overview
A failed plastic lawn chair was examined
to determine the cause of failure. This
chair failed on the premises of a
restaurant In this study the subject chair
is examined and compared to several
exemplar purchased at the same time. The subject chair is shown in
The objective of this study is to determine Figure. The rear right leg and
the cause of failure. front handle of the chair has
broken. There was no additional Case 2
Case 1
damage to the chair.
Crack Surface Analysis of Subject Failure
There are crack arrest lines
perpendicular to the crack
travel direction. Fracture
surfaces indicate a form of
low cycle fatigue. It means There are dirt line visible near
the fracture is not because the fracture. It is because of
of cyclic loading, it is because UV degradation. As these
of static loading.To find out chairs are used in restaurents
the actual reason I have gone under sunlight UV degradation
through user survey. From that causes dirt line near the joint
The indicated zones are the failurre prone
I came to know their using style. where fillet radius are less and
zones. We have to analyze the mode of Case 1 Case 2
Then I did software analysis. loads are high.
failure.

15. 5.1 failure mode effect analysis of plastic chair
User Analysis Softwarer Analysis of Subject Failure Under Informal Sitting Condition
( Only rear legs are fixed )
Standard Sitting Position
Designer designed considering Average Indian
standard sitting posture, i.e. all Human Body Weight
the main body angles are 90 80 kg. FOS=1.5
degree. But in actual students Design Load=120 kg
in their room at IITG use those
chairs with informal postures.
Maximum Stress Maximum Displcement Factor of Safety
408196864 N/m^2 1390.77 mm 1.5
All the legs are fixed
Conclusion
Informal Sitting Position Every individual occupies a temporary space arround him, which is called
personal territory described by Sommer 1969. And designer should keep
in mind this thing.
Under the application of 120 kg static loading the results are above.
The maximum stress developed is 408196864 N/m^2, which is
much more then the yield strength of the material, but it should not
be. And the result due to that is infront of us.
So, this chair failure was a result of a design defect and users’ using
Material= Polypropylene style problen. The design of the leg and its attachment to the seat
Mass Density= 1700 kg/m^3 create a high stress situation that generated cracks between the leg
Tensile Strength= 23000000 N/m^2 and the seat. So, during design a high fillet radius should be given by
Only rear legs are fixed Only front legs are fixed Yield Strength= 369000000 N/m^2 the designer.

16. 6.0 spray cleaning device ( For Hindustan Unilever Ltd. )
TURN
Design Brief OVERFLOW CUM
EXTERNAL
RECESS FOR
REMOVAL OF Dozing and Storage
IN OUT
In India, our laundry detergent Surf Excel is CONTAINER TOP CONTAINER
Mechanism
used mostly for hand washing. When
SPRING LOADED NEW
washing clothes by hand, it’s rinsing that SACHET OLD
TOP CONTAINER
often takes most time and uses most water SACHET
Storage Mechanism
PUSHING THE
Dozing Mechanism
– water that is extremely scarce, especially SACHET
if you live in the dry, southern states of DISC ACTS LIKE
Andhra Pradesh and Tamil Nadu. So we AN INDICATOR
have to design a device that will not creat DOZZED
MAIN STORAGE
LIQUID
lather significantly, but will clean efficiently. CONTAINER
To Pump To Pump
PCB
Compressor
Layout Wash Concept Sketches
Pump 1 & 2 Board Wash Control
Control Board panel
Brush Container lid panel Container lid
(representation only)
Brush Brush
Catridge
Indicator
Space for wire Space
Container & brush for wire
& brush
Finger recess to
Bleach flip the cap
Detergent storage solution
Catridge
and dozing mechanism
Indicator Glass container to show the water level

17. thank you
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