Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Raytheon Seekers Design Review Raytheon Seekers 1 Raytheon Seekers Aaron Scrignar…..Team Leader Eric Draves……Historian Trevor Moody……Web Page Des., Mediator Stacy Davison……Document Coord., Financial Officer LaTanya Williams……Communicator Raytheon Seekers 2 Outline • • • • • • • • • 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 Raytheon Seekers 3 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 Raytheon Seekers 4 Client Contact • Brian Scott – – – – Electronic Systems B.S.E. from NAU in Mechanical Engineering Masters Degree at U of A Worked at Raytheon for seven years • Tucson, Arizona Raytheon Seekers 5 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 Raytheon Seekers 6 Seeker Device Layout Raytheon Seekers 7 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 Raytheon Seekers 8 Raytheon Seekers 9 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 Raytheon Seekers 11 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 Raytheon Seekers 12 Design Method • • • • • 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 Raytheon Seekers 13 Design Evolution • Design One – Two solenoids – Sliding rails – Return spring • Design Problems – Large actuation distance – Unnecessary parts – Space limitation Raytheon Seekers 14 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 Raytheon Seekers 15 Selected Design • Design Three – Solenoid – Arm – Mid-arm pin position – Spring return – Deflection supports – Counterweight Raytheon Seekers 16 Component Selection • • • • Solenoid – PO-6 3Volt Arm – 7075 T6 Aluminum Pin – Stainless Steel with bronze bushing Frame –Ti-6A1-4V HT-46 Raytheon Seekers 17 Selected Solenoid • Meets necessary criteria: - Dimensions - Actuation Length - Forces - Power Requirements Raytheon Seekers 18 Selected Solenoid (cont.) Full Arm Swept Angle: 53 Degrees Raytheon Seekers 19 Arm Design Raytheon Seekers 20 Pin Connection Design PIN ARM BUSHING FRAME PLATE Raytheon Seekers 21 Frame Design Raytheon Seekers 22 Modeling • Made actual size cardboard and CAD models to assess the fit of components Raytheon Seekers 23 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% Raytheon Seekers 24 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 Raytheon Seekers 25 Analysis (cont.) Adams – Arm actuation time Full Arm Swept Angle: 53 Degrees Raytheon Seekers 26 Future Tasks • • • • Component FEA analysis Pin press fit calculations Order materials Fabrication Raytheon Seekers 27 Remaining Project Plan Spring 2003 • • • • • • Status Report #3 Prototype Complete Test in Rail Gun Design Presentation Capstone Conference Finalize Web Page and Report Raytheon Seekers March 27 April 12 April 15 April 22 April 25 May 2 28 Project Funding • Raytheon provided $3,000 for project costs – – – – Prototype Travel Expenses Documentation Material Modeling Raytheon Seekers $1900 $500 $500 $100 29 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 Raytheon Seekers 30 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 Raytheon Seekers 31 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 Raytheon Seekers 32 Questions? Raytheon Seekers 33