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Raytheon Seekers
Design Review
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Raytheon Seekers
Aaron Scrignar…..Team Leader
Eric Draves……Historian
Trevor Moody……Web Page Des.,
Mediator
Stacy Davison……Document Coord.,
Financial Officer
LaTanya Williams……Communicator
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Outline
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Client Description
Problem Definition
Project Needs
Design Philosophy
Design Method
Design Evolution
Final Design
Analysis
Remaining Project Schedule
– Spring 2003
• Project Funding
• Time Log
• Conclusion
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More about… Raytheon
• Specializes in defense systems, government
and commercial electronics, business aviation
and special mission aircraft
• Chairman & CEO: Daniel P. Burnham
• $16.9 billion revenue in 2001
• 79,000 employees worldwide
• Headquarters located in Lexington, MA
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Client Contact
• Brian Scott
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Electronic Systems
B.S.E. from NAU in Mechanical Engineering
Masters Degree at U of A
Worked at Raytheon for seven years
• Tucson, Arizona
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Problem Statement
• Preliminary design and
proof-of-principal prototype
needed for a window
positioning system to be
used in a tank-launched
infrared guided warhead
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Seeker Device Layout
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Project Needs
• Survive 10KG launch
• Packaged in 0.2” thick by
2.9” diameter cylinder,
excluding electronics
• Move a Germanium lens
.04” thick by .6” diameter
to cover a photocell array
• Lens must stay in position
for 1 second, and move in
and out of the field in less
than 1 second
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Shock Response Spectra
Launch Conditions
Flight Conditions
•Set Back: 10,000G
•Lateral: 0-3G
•Balloting: 3,300G
•Vibration: 5G
•Set Forward: 2,000G
Scope of Design Constraints
• One penny subject to
10,000 G’s weighs
approximately 59 lbs.
• The restricted thickness
of the work area is about
the thickness of 3 ½ quarters
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Design Philosophy
• K.I.S.S.
- Minimize number of parts to reduce probability
of failure
• Keep close contact with client
– Brings attention to potential design problems
before it’s too late
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Design Method
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Brainstorming- Mechanism ideas
Mechanism Selection- Based on size constraints
Modeling- Cardboard model to assess geometries
Analysis- Hand calculations, Adams, Cosmos
Finalize Design- Select dimensions, Tolerance
fitting
• Fabrication- Large scale model and actual
prototype
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Design Evolution
• Design One
– Two solenoids
– Sliding rails
– Return spring
• Design Problems
– Large actuation distance
– Unnecessary parts
– Space limitation
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Design Evolution
• Design Two
– Solenoid
– Arm
– Pin close to edge
– Spring return
• Design Problems
– Arm deflection
– Pivot position accentuates
balloting forces
– Requires a latching
mechanism
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Selected Design
• Design Three
– Solenoid
– Arm
– Mid-arm pin position
– Spring return
– Deflection supports
– Counterweight
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Component Selection
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Solenoid – PO-6 3Volt
Arm – 7075 T6 Aluminum
Pin – Stainless Steel with bronze bushing
Frame –Ti-6A1-4V HT-46
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Selected Solenoid
• Meets necessary criteria:
- Dimensions
- Actuation Length
- Forces
- Power Requirements
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Selected Solenoid (cont.)
Full Arm Swept Angle:
53 Degrees
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Arm Design
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Pin Connection Design
PIN
ARM
BUSHING
FRAME
PLATE
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Frame Design
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Modeling
• Made actual size
cardboard and CAD
models to assess
the fit of components
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Analysis Justification
• Deformation of surfaces are within
tolerances defined by the optical engineer
• Deformation of support structure for optical
and antenna elements is within tolerance
and creates no interference
• No ultimate failures occur and probability
of failure is less than 0.01%
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Analysis
• Hand Calculations
– Arm deflection
– Arm material failure for normal forces
– Arm material failure for balloting forces
– Pin material failure for balloting forces
– Required swept angle of arm
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Analysis (cont.)
Adams – Arm actuation time
Full Arm Swept Angle:
53 Degrees
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Future Tasks
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Component FEA analysis
Pin press fit calculations
Order materials
Fabrication
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Remaining Project Plan
Spring 2003
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Status Report #3
Prototype Complete
Test in Rail Gun
Design Presentation
Capstone Conference
Finalize Web Page and Report
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April 12
April 15
April 22
April 25
May 2
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Project Funding
• Raytheon provided $3,000 for project costs
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Prototype
Travel Expenses
Documentation Material
Modeling
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$1900
$500
$500
$100
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Purchases to Date
• 8 SP-25 solenoids (two 3-volt, four 6-volt,
two 12-volt) – testing, prototype
• 8 PO-25-6 (two 3-volt, four 6-volt, two 12volt) – testing, prototype
• Cork – modeling
• Cutting supplies – modeling
• Birch plywood – modeling
• Balsa wood - modeling
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Time Log
• Aaron Scrignar
71.95
• Eric Draves
71.00
• Trevor Moody
43.25
• Stacy Snyder
32.55
• LaTanya Williams
39.75
_________________________
Total Hours:
258.5 hrs
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Conclusion
• The balanced swing arm design is simple
and efficient in providing the required lens
motion while withstanding the
environmental constraints
• Prototype fabrication will be complete by
April 12, 2003 for Rail Gun test
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Questions?
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