Transcript P08456: LED Light for an Underwater ROV

P08456: LED Light for an
Underwater ROV
Jeremy Schiele- ME, Project Manager
Jonathan Lent- ME, Housing Design
Justin VanSlyke- ME, Mounting Design & Testing
Benoit Hennekinne- EE, Electrical Design
Ryan Seeber- CE, Control GUI & Programming
Funding Provided by:
Project Scope
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To Design and build a lighting system
meant for underwater applications, but
capable of being used on land based
platforms as well (eg: RP10 projects). The
light housing should also be compatible
with the thruster unit of P08454, and both
be controlled from a single interface.
Project Background
Stems from lighting problem
faced in original RIT
submersible (P06066)
 Inspiration was to provide RIT
& HAI with more cost effective solutions to
lighting systems for their products
 Would enable RIT to expand the scope of
regular senior design projects to an
underwater environment

Project Customers

Primary Customer: Dresser Rand
– Investigating underwater technology for future
use in oil industry uses
– Foresee future engineering needs

Secondary Customer: RIT Robotics Platform
– Able to utilize lighting system on RP10 & 100
platforms
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Customer/Advisor: Hydroacoustics Inc.
– Contributed background knowledge & belongs to
a possible market for future iterations
Primary Requirements

Waterproof & Pressure Resistant Design
– ensures survivability of unit

High Light Output
– greater than existing light

Low Power Consumption
– helps prolong onboard battery life

Controllable from surface unit
– both light and thruster operated simultaneously

Modular Housing Design
– to be shared with thruster unit to minimize # of parts
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Investigation into multi-spectral lighting
– Water & its contents absorb/scatter certain wavelengths
Housing Design Iterations

Scalable Design
– Unique sized parts
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Modular Designs
– Shared portion &
defining sections
1) Finned housing
2) Bullet housing
Mounting Design Iterations

Hard Mount Design
– Used for thruster

Ball Joint Design
– Maximum light
adjustment
Final Design-Housing & Mounting

Modular design

Swivel Mount
Design Implementation
Standoffs x 9
Bullet Housing
Snap-ring
Lens
O-Ring
Bulkhead
Connector
Lens Cap
O-Ring
LED Board
Driver Board
μC Board
Power Board
Final Electrical Design
Light
Output
LEDs
Signal
Feedback
LED
Driver
Power
PWM
USB
User
Input
G.U.I.
RS485
USB
Converter
MicroController
5V
24 V
Battery
Power
Board
Temp.
Sensor
Final Software & GUI Design
Engineering Specifications
Spec.
#
Design Specification
Importance
(1 < 5)
Unit
of Measure
Marginal
Value
Ideal
Value
1
Low wattage LED system
5
watts/ fixture
10
5
2
Low heat generation from LEDs
5
watts/ fixture
2.8
1
3
Luminous flux
5
lumen/ fixture
250
350
4
Multi-spectrum light
3
NA
White+1 color
White+2 colors
5
Enclosure size
4
in x in x in
3x3x6
2x2x4
6
Assembly/Disassembly mount
3
sec
90
60
7
Microcontroller voltage
4
volts
5
3.3
8
Board Voltage
4
volts
5
3.3
9
LED Voltage Power
4
volts
24
7.6
10
LED Current
5
amp
1
0.7
11
Submergible (water tight seals)
5
ft
400
500
12
Pressure resistant
5
psi
170
216
13
Preservation of open architecture
4
y/n
y
y
14
Preservation of open source system
4
y/n
y
y
15
Lights & thrusters controlled by
1 software package
5
y/n
y
y
Key metrics in bold
Testing Overview

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Pressure testing
conducted at
Hydroacoustics Inc.
Timed mounting/removal
trials
Components inherent to
design
Luminous Flux test video
to follow presentation
Method used for luminous
flux testing
Testing Verification
Spec #
Design Specification
Marginal Value
Testing Result
Pass/Fail
Spec Met
10 W
7.004 W
PASS
Marginal
2.8
5.6 W (max.)
FAIL
NA
250 lm
510 lm
PASS
Target
White + 1 color
White + 1 color
PASS
Marginal
3x3x6
2.75 dia. x 4.5 in.
PASS
Marginal
1
Low wattage LED system
2
Low heat generation from LEDs
3
Luminous flux
4
Multi-spectrum light
5
Enclosure size
6
Assembly/Disassembly mount
90
20
PASS
Target
7
Microcontroller voltage
5V
5V
PASS
Marginal
8
Board Voltage
5V
5V
PASS
Marginal
9
LED Voltage Power
24 V
24 V
PASS
Marginal
10
LED Current
1
0.350 V
PASS
Target
11
Submergible (water tight seals)
400 ft
920 ft
PASS
Target
12
Pressure resistant
170 psi
400 psi
PASS
Target
13
Preservation of open architecture
Y
Y
PASS
Target
14
Preservation of open source system
Y
Y
PASS
Target
15
Lights & thrusters controlled by 1
software package
Y
Y (expected)
TBD
NA
Projected Budget

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Cost / LED light unit(4):
Cost / thruster unit (4):
Development board:
Prototype Unit:
$380.87
$323.69
$200.00
$150.00
Total Light Unit Budget:
$1873.48
Allocated to P08454:
$1294.76
Total: $3168.24
Ending Project Budget

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Cost / LED light unit(4):
Cost / thruster unit (4):
Development board:
Prototype Unit:
$550.09
$260.89
$85.80
$114.91
Total Light Unit Budget:
$2200.38
Allocated to P08454:
$1043.57
Total: $3444.66
In Retrospect

Mitigate electrical problems
– Allocating more electrical engineers for board
development (2 minimum)
– Simplifying board design to ease strain on our
single electrical engineer

Beneficial outcome of LED manuf. problems
– Two LED styles allows for different company’s
models to be used
Future Improvements
Try multiple colors of LEDs from Lumileds
or Cree
 Minimize base housing size/weight

– Beneficial for both light & thruster unit
Look into more compact bulkhead
connectors
 Complete anodizing of thruster housing
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