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 productsData Links, Visualizations, and Digital Mapping

Seeking a way to monitor battle field terrain ○ Monitor foot travel○ Monitor vehicle presence

Project ScopeDesign 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 networkDesign 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 designSeed 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

the light, thin wing1

2

3

The Design Components

SensorsInfrared Sensor

○ Glolab DP-001Vibration sensor

○ SQ-SEN-200 Omni-directional tilt and vibration sensor (a)

PowerFlexible 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

dc

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.

Combining these two equations and substituting a known area, length and width:

Obtaining the Final Equation We now combine the approximated lift equation with the

simplified area to get lift as a function of length

&

Note: CI= lift coef. , ρ= air density , ω= angular velocity

Length

2468

10121416

in

Lift Length( )

-41.927·10-33.084·10

0.0160.049

0.120.25

0.4630.789

lbf

Center of GravityInside head Maximizes use of entire wing length

Optimization

Use rounded edgesInitial prototypes failed due to stress

concentrations

Optimization

Prototype Design

Exploded View

1 - Wing2 - Solar Panel3 - IR Sensor (2)4 - Vibration Sensor5 - Micro Controller6 - Spine7 - Head

Prototype Design Detail

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

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

WE ARE HERE

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&orderby=product_name&limit=20&limitstart=100&vmcchk=1&Itemid=3

http://www.amazon.com/exec/obidos/ASIN/B000X27XDC/ref=nosim/coffeeresearch23436-20

Acknowledgement

Dr. Jonathan Clark - FAMU/FSU College of EngineeringDepartment of Mechanical Engineering

○ Use of the STRIDE Lab

Mr. Matt Christensen – Harris Corporation