Transcript Group 17: FAMU-FSU College of Engineering Clinton Bencsik Mark Brosche

Group 17:
Clinton Bencsik
Mark Brosche
Christopher Kulinka
Christopher Redcay
FAMU-FSU College of Engineering
Overview

Introduction

The Design Concept

Experimental Calculations

Prototype Design

Bill of Materials & Cost Analysis

Conclusion

Planned Future work

Harris Corporation
 $5.3 billion revenue in 2008
 Fields
○ Communications and Intelligence Programs
○ Defense programs
 Communications and information processing products
 Data Links, Visualizations, and Digital Mapping
 Seeking a way to monitor battle field terrain
○ Monitor foot travel
○ Monitor vehicle presence
Project Scope
Design a sensor vehicle to house a battlefield awareness network
that can be dropped from any altitude.
Project Requirements
Design Specifications
Survive a fall from a large height with
sensors intact
Make from a material with Young's
Modulus >0.8GPa
Hold a sensor array capable of detecting
human and vehicle presence
Design with infrared and vibration
sensors to report disturbances
Operate for several weeks without
maintenance
Use solar cells to recharge batteries
or capacitors
Auto-rotate during freefall similar to a maple
seed
Design as a scaled up maple seed
with "seed" holding sensors
Transmit data to a central network
Design with an 802.15.4g
transmitter to send data
What is significant about a Maple seed?
Wing on seed is a natural
mechanism for dispersing seeds
over a large area.
 Seeds “float” to the earth using
auto-rotating flight

Why a Maple seed?
Simplifies design to avoid
complex moving parts
 Produces a desirable spread
pattern to monitor a large area

The Design Concept

Single wing auto-rotating design
 Seed sensor housing (1)
○ SDM manufactured
○ Integrated sensors and controllers
○ Integrated circuits
○ Integrated transmitter and power source
 Wing with flexible solar cells (2)
○ Provides power to battery and capacitor
○ Curve and shape cause auto-rotation in flight
 Wing spine (3)
○ Provides support for
1
the light, thin wing
2
3
The Design Components

Sensors
 Infrared Sensor
○ Glolab DP-001
 Vibration sensor
○ SQ-SEN-200 Omni-directional tilt
and vibration sensor (a)

Power
 Flexible Solar cells (b)
○ Silicon Solar
○ 4.5” x 1.5” (3V at 50 mA)
 Battery
○ Sanyo 3V RLITH-5
 Capacitor (c)
○ Panasonic 5.5V
a
b
c
d
The Design Concept Video
Dramatization. Objects not to scale.
Proposed Component Diagram
Power collected from solar cell.
 Energy stored in DC battery.
 Simultaneously senses infrared signals and
ground vibrations.
 Sensor outputs directed to microcontroller.
 Signal transmitted to central unit.

Application of the Lift Equation to Auto-Rotating
Wings
Simplifying the Area
Equation of area in terms of the total length of
the maple seed.
 Constant wing shape in order to introduce a coef.
that represents that common shape.
L
C2
A C1 L W
W


Combining these two equations and substituting a
known area, length and width:
Area( L)
2
0.158  L
Obtaining the Final Equation

We now combine the approximated lift equation with the
simplified area to get lift as a function of length
Lift
2


CI    L  A
2
&
Area( L)
2
Lift( L)
4
CI     0.158 L
4
Note: CI= lift coef. , ρ= air density ,
ω= angular velocity
2
0.158  L
Length 
Lift ( Length ) 
2
4
1.927·10-4
3.084·10-3
in
6
0.016
8
0.049
10
0.12
12
0.25
14
0.463
16
0.789
lbf
Optimization

Center of Gravity
 Inside head
 Maximizes use of entire wing length
Optimization

Use rounded edges
 Initial prototypes failed due to stress
concentrations
Prototype Design
Prototype Design Detail

Exploded View

1 - Wing
2 - Solar Panel
3 - IR Sensor (2)
4 - Vibration Sensor
5 - Micro Controller
6 - Spine
7 - Head
Fused Deposition Modeling Prototype
Overall Length – 6.75”, Seed Length – 1.5”, Wing Width – 1.75”
Final Bill of Materials
& Cost Analysis

Total Cost per Seed: $92.52
Future Plan
WE ARE HERE

In the next two weeks before final presentation:
 Final components decided upon
○ Cost analysis completed
 Shape prototype will be completed and tested
 Design ready for construction
References

http://www.signalquest.com/sq-sen-200.htm

http://www.siliconsolar.com/flexible-solar-panels-3v-p-16159.html

https://www.ccity.ie/site/index.php?option=com_virtuemart&page=shop.
browse&category_id=0&keyword=&manufacturer_id=0&Itemid=3&orde
rby=product_name&limit=20&limitstart=100&vmcchk=1&Itemid=3

http://www.amazon.com/exec/obidos/ASIN/B000X27XDC/ref=nosim/co
ffeeresearch23436-20
Acknowledgement

Dr. Jonathan Clark - FAMU/FSU College of Engineering
Department of Mechanical Engineering
○ Use of the STRIDE Lab

Mr. Matt Christensen – Harris Corporation