Supradip Das

supradip das( portfol^o )

M.Des ( Industrial design )Indian Institute of Technology Guwahati

personal i prof^le

We are all ready complicated beings. So my objective is to make surroundings simple through Industrial Design.

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Education

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

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

Working Experience

Software Skills

Soloworks, Pro-E, Auto CAD, Adobe illustrator, Adove photoshop, Adobe indesignMicrosoft Office 2007

1.0 hovercraft for rescue Design Brief Design Challenge Mood Board for Ideation

Design Research

( on going Master Thesis Project )

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 can not achieve target when water current is more then 8 knot and water is full of wave and wake. Those vehicles also can not overcome water hazards during flash flood or similar kind of disasters. Design a vehicle which will be useful for rescue as well as transportation also.

Types of flood Stages of flood Flood water behaviour Flood hazards Existing flood rescue vehicle in India Limitation of existing rescue vehicles Rescue vehicles in the world Hi speed water vehicle type

Air cushion

The limitations of any boat are of two kinds. Firstly, the physical limitations built into the boat by the designer and by the motor installed on the boat. Secondly, safety limitations.

I am taking into consideration the force, pressure and moment created in spine of a crew during rescue.

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1.1 hovercraft for rescue Technical Specification Sketches


Hull dimensionLength: 24 ft Breadth: 10 ftHeight: 2.5 ft Weight: 5582 lbWave capability: 2 ftMaterial: High density polyethylene Speed: 36-54 ft/sSkirt Material: HypalonType: 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 rpmEngine HP: 48 hpNumber of Fan blade desired: 9

Drag System- Approximate lift to drag ratio: 1.6 Total thrust required: 3488.75 lbTotal Power required: 346.84 hpNo of blade: 5

bordered ray fish Inspiration

1.2 hovercraft for rescue CFD Analysis


Pressure Plot

Pressure Trajectory

Velocity Plot

Velocity Trajectory

-1E-11

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1.3 hovercraft for rescue ( on going Master Thesis Project )

3D Rendering

2.0 spy plane Design Brief Design Challenge Mood Board for Ideation

Design Research

( Bachelor Thesis Project )

Types of aircraftAerofoil nomenclatureFlight lift theory Modren sail theoryExisting spying object in India Dynamics of air vehicle Spy plane character Aircraft anatomy

Sometimes anti social element captures the sensitive areas. In this situation our soldiers are helpless to fight with elements.

Our proposed spying object will definitely help our soldiers in crucial situations. Our flying object will have the following features -• Disc Shape, so that radar can’t detect it.• Better gliding capability.• Can take off in less space.• Can be used as spying purpose.We are designed, fabricated and tested our object theoretically as well as practically as far as possible.

* Gliding capability* Illusionary* Unidentifiable* Untraceable* Unmanned

Used flat aerofoil theory

Air flow having no viscosity has zero drag and no lift.

Vortex created

If we suddenly turn the viscosity on, the flow about our flat-plate airfoil will begin to change. The viscous boundary layer will start to form on the surface. The viscous air will create a vortex which will turn down the tailing edge and leading edge up. And a magic lift starts.

frisbee

2.1 spy plane ( Bachelor Thesis Project )

3D Rendering

Large wing span with a disc shape can be really helpful to glide through air for a long time. Twisting twin engine helps to take off vertically

Above some altitude flying disc creates the illusion of

some UAV’s or strange birds in the minds of the people.

Untraceable as radar is unable to trace disc shape

Equipped with remote sensing

cameras

No flap, no aileron. Only elevator.

2.2 spy plane Technical Specification

( Bachelor Thesis Project )

Body dimension

Diameter: 1 meterThickness: 1 inchMaterial: High density thermocol

EngineType: Glow plug engine Control system: Remote operated servomotor driven.Weight: 450 gm

Lift System-Speed of Engine: 16000-17000 rpmEngine HP: 0.7 bhpNumber of Fan blade desired: 2

Drag System- Approximate lift to drag ratio: 9.166 Total thrust required: 3.746 N

Prototype

3.0 sit ski for physically disabled Design Brief Sitting Posture Ergonomics

( lower limb )

Stress Displacement Simulation and Modification

Stress Simulation Displacement Simulation

Many people with mobility limitations can’t enjoy participating in winter recreational activities. In order to enjoy the alpine ski slopes, wheelchair users and others who have lower limb limitations need skiing equipment that can be used in a seated position.Design a sit ski which is ergonomically comfortable and absorb shocks due to damping on the way of ski.

ModificationMaximum Stress 4.41738e+007 N/m^2 Maximum Displacement 1025.22 mm Stress reduced by shock absorber

Displacement reduced by spring lock

100°

120°

120°

46°

277

37°

360

429

Buttock to popliteal length

Upper lumber height

According to easy sitting posture defined by Oharaand Indian Anthropomentric Data25th percentile

25th percentile

3.1 sit ski for physically disabled ( lower limb )

3D Rendering

Without pivot frame design

Silicon cushion for comfort

Kevlar composite for lighter body

Greatest range of peple can sit

Lower center of balance

4.0 futuristic bicycle Design Brief

Tour/MTB/Hybrid Comfort/Cruiser Dutch

Sitting Posture and Handle Ergonomics( Possible sitting postures with this bike and handle grip style )

Technical Innovation Conventional design to avoid torsion, bending and compression

Static, dynamic and cyclic loading on abicycle frame

Pedalling torque

Load from road

Bending fronbreaking or crashing

Rider weight

Shock absorber and linkage to reduce torsion on Seat Stay and Top Tube

My InnovationInvisible spring for shock absorb

Inside front deraillure covercoil spring to reduce pedalling torque and to resist shock

One end connectedto Frame

Another end connectedto Chain Stay

Rider weight

Road reaction

Bicycles are generally divided into 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.

4.1 futuristic bicycle 3D Rendering

Dresses, loose clothes and children’s feet are safe from the rear wheel and chain guard

Integrated mud guard

Unpatented brake system

Unpatented suspension system

Without seat stay frame

Advanced rim cross-section

Ergonomic handle with three different possible position

5.0 failure mode effect analysis of plastic chair Analysis Brief

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 objective of this study is to determine the cause of failure.

Overview

The subject chair is shown in Figure. The rear right leg andfront handle of the chair has broken. There was no additional damage to the chair.

The indicated zones are the failurre prone zones. We have to analyze the mode of failure.

Crack Surface Analysis of Subject FailureThere are crack arrest lines perpendicular to the crack travel direction. Fracture surfaces indicate a form of low cycle fatigue. It means the fracture is not because of cyclic loading, it is because of static loading.To find out the actual reason I have gone through user survey. From that I came to know their using style. Then I did software analysis.

Case 1 Case 2

Case 1 Case 2

There are dirt line visible near the fracture. It is because of UV degradation. As these chairs are used in restaurents under sunlight UV degradation causes dirt line near the joint where fillet radius are less and loads are high.

5.1 failure mode effect analysis of plastic chair User Analysis

Standard Sitting Position

All the legs are fixed

Every individual occupies a temporary space arround him, which is called personal territory described by Sommer 1969. And designer should keepin mind this thing.

Designer designed considering standard sitting posture, i.e. all the main body angles are 90 degree. But in actual students in their room at IITG use those chairs with informal postures.

Only rear legs are fixed Only front legs are fixed

Informal Sitting Position

Softwarer Analysis of Subject Failure Under Informal Sitting Condition

Conclusion

Maximum Stress408196864 N/m^2

Maximum Displcement1390.77 mm

Factor of Safety1.5

Average IndianHuman Body Weight80 kg. FOS=1.5Design Load=120 kg

Material= PolypropyleneMass Density= 1700 kg/m^3Tensile Strength= 23000000 N/m^2Yield Strength= 369000000 N/m^2

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 style problen. The design of the leg and its attachment to the seat create a high stress situation that generated cracks between the leg and the seat. So, during design a high fillet radius should be given by the designer.

( Only rear legs are fixed )

6.0 spray cleaning device Design Brief

Concept Sketches

( For Hindustan Unilever Ltd. )

In India, our laundry detergent Surf Excel is used mostly for hand washing. When washing clothes by hand, it’s rinsing that often takes most time and uses most water– water that is extremely scarce, especially if you live in the dry, southern states of Andhra Pradesh and Tamil Nadu. So wehave to design a device that will not creat lather significantly, but will clean efficiently.

Dozing and StorageMechanism

OVERFLOW CUM EXTERNAL CONTAINER

RECESS FOR REMOVAL OF TOP CONTAINER

SPRING LOADED TOP CONTAINER PUSHING THE SACHET

DISC ACTS LIKE AN INDICATOR

MAIN STORAGE CONTAINER

DOZZED LIQUID

Layout

To Pump To PumpDozi

ng M

echa

nism

Stor

age

Mec

hani

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IN OUT

TURN

NEWSACHET OLD

SACHET

Brush (representation only)

Detergent storage and dozing mechanism

PCBCompressor

Pump 1 & 2

Bleach solution

Container

Catridge Indicator

Container lid

Wash Board

Controlpanel

Brush

Space for wire & brush

Finger recess to flip the cap

Catridge Indicator Glass container to show the water level

Container lid

Wash Board

Controlpanel

Brush

Space for wire & brush

Supradip Das

Education

Transcript of Supradip Das