Kenji Petrucci Cody Jones Sam Murphy. Introduction Passenger cabin intrusion, PCI Severe...
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Transcript of Kenji Petrucci Cody Jones Sam Murphy. Introduction Passenger cabin intrusion, PCI Severe...
![Page 1: Kenji Petrucci Cody Jones Sam Murphy. Introduction Passenger cabin intrusion, PCI Severe Injury/fatalities No requirement to prevent side under.](https://reader035.fdocuments.us/reader035/viewer/2022062217/56649e845503460f94b86c70/html5/thumbnails/1.jpg)
SPRING PROGRESS REPORTSIDE UNDER RIDE GUARD ANDAERODYNAMIC FAIRING
Kenji PetrucciCody JonesSam Murphy
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Introduction
Passenger cabin intrusion, PCI
Severe Injury/fatalities
No requirement to prevent side under ride
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Background
Rear guard initially required in 1953 but were highly
ineffective; safer guards required in 1998 by NHTSA
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Background
Over 4 million trailers travel on US roads, none with side under ride guards
Approx 226 people die annually due to side under ride
98% of collisions with a trailer result in at least 1 fatality
*all pictures from http://www.crashforensics.com/truckunderride.cfm
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Customer needs
Absorb force of a light duty vehicle (6000lbs) traveling at 35mph and prevent under ride
Cost efficient and easily installed by end user; bolt-on “kit” configuration
Provide aerodynamic qualities Offset cost of purchase/installation Increase fuel efficiency Reduction in total hauling capacity
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Product Specifications
Impulse time of 200ms Impulse force vs. static force
Safety factor N = 2tvmJ avgF Impulse
English SI
Mass 6000lb 2722kg
Velocity 35mph 15.65m/s
Δt 0.2s 0.2s
Δv 35mph 15.65m/s
Table 1
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Product Specifications
vmtFJImpulse avg
kNs
smkg
t
vmFavg 213
/
2.0
65.152722
Units of N*s
Factor of safety = 2 means double the impulse force
Nearly 500,000N of force for static load
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Product Specifications
Modular vs. single unit
Impact always on at least 2 sections
Force per bar approximately 213,000N
47,884lbs
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Final Design
Aluminum 1.5in (0.25in wall thickness) square tubing 0.25in thick brackets for welding
Steel 2in (0.25in wall thickness) square tubing Weld directly to trailer I-beam
6in x 24in x 0.5in aluminum impact bar
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Final Design Aluminum w/brackets
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Final Design Steel
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Stress/Deflection Analysis 6061-Al Max stress
100ksi for steel 85ksi for aluminum
Max stress at joint corners Impact bar failure acceptable
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Summary
Aluminum questionable (6061-T6) UTS = 45ksi Tensile yield strength = 40ksi UBS = 88ksi Bearing yield strength = 56ksi
Max deflection at ends acceptable, even if failure occurs
Safety factor of 2 realistic and achievable
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Fabrication/Assembly/TestingID Task Name Duration Start Finish Predecessors
1 Design Finalization 4 days? Thu 1/13/11 Tue 1/18/11
2 CAD Modeling 2 days? Thu 1/13/11 Fri 1/14/11
3 Stress Analysis 1 day? Mon 1/17/11 Mon 1/17/11 2
4 Bill of Materials 1 day? Tue 1/18/11 Tue 1/18/11 3
5 Progress Report Presentation 2 days? Wed 1/19/11 Thu 1/20/11 1
6 Team Evals 3 1 day? Fri 1/21/11 Fri 1/21/11 5
7 Staff Meeting 3 days? Tue 2/1/11 Thu 2/3/11 5
8 Meet with Sponsors 1 day? Fri 2/4/11 Fri 2/4/11 5,7
9 Mid Point Review Presentation 1 day? Tue 2/22/11 Tue 2/22/11 8
10 Staff Meetings 5 days Mon 2/28/11 Fri 3/4/11 9
11 Order Parts/Materials 7 days? Mon 2/28/11 Tue 3/8/11 9
12 Fabrication 12 days Wed 3/9/11 Thu 3/24/11 11
13 Machining 4 days Wed 3/9/11 Mon 3/14/11 11
14 Welding 4 days Tue 3/15/11 Fri 3/18/11 13
15 Mounting 4 days Mon 3/21/11 Thu 3/24/11 14
16 Crash Test / FMVSS Test 5 days? Fri 3/25/11 Thu 3/31/11 15
17 Staff Meetings 1 day? Thu 3/17/11 Thu 3/17/11 10
18 Staff Meetings 1 day? Tue 3/29/11 Tue 3/29/11
19 Final Project Presentation 13 days? Tue 3/22/11 Thu 4/7/11
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Risks
Time constraints Parts/Shipping
Fabrication Welding, machining
Testing Correct material choice
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Acknowledgements
Dr. Hollis Faculty advisor
Perry Ponder Sponsor
Andrew Magaletti
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References
Cengel, Yunus A., Robert H. Turner, and John M. Cimbala. Fundamentals of Thermal-fluid Sciences. 3rd ed. Boston: McGraw-Hill, 2008. Print.
Wolfson, Richard. Essential University Physics. 1. San Francisco: Pearson Addison Wesley, 2007. Print
www.onlinemetals.com