Upload
zareh
View
26
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Retractable Tractor Trailer Boat Tail. Tim Slattery 11/15/12. Background. Typical full tractor trailer will get about 6 mpg & travels 120,000 miles per year $80,000 annual fuel cost Rear of trailer contributes ~25% of total aerodynamic drag. Description. Goal - PowerPoint PPT Presentation
Citation preview
Retractable Tractor Trailer Boat TailTim Slattery11/15/12
Background• Typical full tractor trailer
will get about 6 mpg & travels 120,000 miles per year
• $80,000 annual fuel cost• Rear of trailer contributes
~25% of total aerodynamic drag
Description• Goal
• To decrease drag on rear of trailer while still allowing easy access to cargo
• Device must retract to allow doors to fully open
Description• Hinged metal plates form
shape• Device is unlocked from
deployed position• Pivot arm is rotated, pushing
panels down the side of the trailer
• When in place, the device is locked into position and the doors can be opened
• Device is deployed by reversing this procedure
Customer Needs• Allows use of current dock• Improves fuel economy• Device does not obscure any tail lights• Device must lock in deployed and retracted positions• Pays for itself in 1 year
0 2 4 6 8 10 12 14 16 18 200
1000
2000
3000
4000
5000
6000
7000
Ann
ual F
uel S
avin
gs ($
)
Percent Drag Coefficient Reduction
Main Specifications• Reduces aerodynamic drag by >7%
• Annual fuel savings of $2,200• Trailer doors are free to open at least 250°• Extends off back of truck 5 feet or less
• Department of Transportation (DOT) Constraint• Does not extend past width and height of trailer
• DOT Constraint• Deploy or retract device in less than 30s• Deploy or retract in 5 steps or less
Scope & Deliverables• Scope
• Design that allows full access to trailer doors• Reduce drag by 7-9%• Focus on retractable design mainly
• Deliverables1. Small scale trailer model to prove drag reduction2. One half scale prototype to demonstrate retractable function
Customer• Aerodynamic Trailer Systems, LLC
• Jim Domo • Design products to improve trailer efficiency• Makers of the SmartTail®• 4-7% fuel savings• Only deploys at highway speeds
• Faculty Consultants• Dr. Gomes
• Mechanical Design, Mechanics• Dr. Wellin
• Testing, Aerodynamics, Fluid Mechanics• Dr. Venkataraman
• Fluid Mechanics, CFD, Wind Tunnel
Team Staffing & Equipment• 4-5 ME Students
• CFD Analysis• Fluid Dynamics• Aerodynamics• Stress Analysis• Fatigue Analysis• Mechanical Design
• RIT Drag Tank• RIT Wind Tunnel• RIT Machine Shop• MSD lab
Budget Estimate• Budget $750.00• High investment yields high long term savings• 7-9% drag reduction = $2205.59-$2835.76 annual fuel savings• Consumer cost <$2000.00 provides net savings in under one
yearItem Source Cost Each ($) Quantity Total ($)
6061 Aluminum Sheet (51” x 24” x 1/16”)
www.metalsupermarkets.com ~60 16 ~480
Miscellaneous - - - 150.006061 Aluminum Square Tubing (8 ft)
www.onlinemetals.com 7.00 4 28.00
1:24 Scale Truck www.3000toys.com 29.00 1 29.00Plywood (4’ x 8’ x 0.5”)
www.lowes.com ~9 3 ~27
2x4 boards (8 ft) www.lowes.com ~4 7 ~28 Total ~$750.00
Future Projects• Optimize tail geometry
• Improve fuel savings• Up to 16% fuel savings• Saves $12,000 annually
• Fully automated design• Minimize operator interaction
• Full scale prototype testing
References• Aerodynamic Trailer Systems, LLC
• www.ats-green.com• Tractor Trailer Tail: Final Report
• http://www.seniord.aere.iastate.edu • PRP
• http://edge.rit.edu/edge/R13902/public/HW_Deliverables/Individual%20Submissions/Tim%20Slattery/PRP%20Drafts/PRP-Final.pdf