SAE Baja Ergonomic Evaluation
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Transcript of SAE Baja Ergonomic Evaluation
Nina Phanthanousy, Paulo Davila, Zak Karstetter, Rashaad Swanson, Betsy Durnin
Baja SAE All-Terrain
Vehicle
HFS535-01December 11, 2011
• SAE Internationals Baja competition open to engineering students all over the globe.
• Originated at the University of South Carolina in 1976
• Objective is to design, build, test and compete
• Design for cost effective , reliable, maintainable, and ergonomic engineering.
• ERAU has the only all female team
GIRL POWER!
Background
Current Chassis
Requirements for Consideration • fit 5th% female
to 95th% male • Safety distances
between person and structure.• Seat •Wheel assembly• Kill switch
Survey Analysis: Background
Musculoskeletal Disorder
Marshall and Mansfield (2001)
Experiment • Purpose : Musculoskeletal Disorder in Rally Racing Drivers• Participants : 118• Requirements : 10 days minimum of rally racing • Results: 70% Lumbar Spine Discomfort
54% Cervical Spine Discomfort Survey • Nordic Muscular Skeletal Questionnaire • UK Medical Research Council survey
Survey Analysis Section C• Hand Wrist
Symptoms
• Pain Description
Section D• Outside
Exposure to vibrations
• Health Conditions
Survey Analysis : Results
Whole-Body Vibrations • Increased
Heart Rate• Muscle
Tension• Herniated Disc("Whole-body vibration," )
Survey Analysis : Results • Herniated Disc : Lumbar ("University of
Maryland," 9)• Pain/ Numbness in Legs• Reflexes Negatively Impacted• Muscle Weakness• Shoulder/ Arm pain if Herniated Disc in Neck
• Recommendation
Proposed Ergonomic Changes and Recommendations
Seat Adjustability and ComfortNo current adjustability
Steering Wheel AdjustmentWrist Restraints
Ergonomic Survey AnalysisOverview of areas of
discomfort and pain
Segment ScoreRange
Color associated to the score
1 2 3 4 5 6
Upper arm 1 to 6
Forearm 1 to 3
Wrist 1 to 4
Wrist twist 1 to 2
Neck 1 to 6
Trunk 1 to 6
RULA Analysis Risk analysis tool in CATIA that looks at human activity, for example, the right or left side of a manikin and its posture (static, intermittent, and repeated). Green indicates that the posture is acceptable if the posture is not being repeated over long periods of time. Yellow indicates that further investigation is required and changes may be needed. Orange indicates that further investigation and changes must be made. Red indicates further investigate and changes must be immediate.
Cannot accommodate the smallest statured person comfortably, creates arm strain and fatigue in trying
to maintain the reach
Make column adjustable hole and closed pin system in the
steering shaft to extend the overall length.
Baja vehicle chassis in CATIA steering column is 17.5 in. = L and 1 in. = D
Steering Wheel
Lower Column 15” 1” OD 7/8” ID ¼” holes
1st hole is 4” from top 2” spacing between
Upper Column 15” 7/8” OD ¾” ID ¼” holes
1st hole 2” from end 2” Spacing
6” of adjustability 16”-22” in overall length
The respective closed pin is 1-3/8” in length and will go completely through column for stability.
Kill Switch
Steering Wheel
No Seat in the model!
Racing-style Seat
Added Seat Rails 4.5” of adjustability
Positioned all the way back like actual car
Seat
ERAU Baja team is one of many teams that is compromised of engineering students from universities across the globe who annually participate in a competition that includes the design, build, and testing of a motor vehicle for the society of automotive engineers.
Three different emerging issues were discussed and analyzed to show ergonomic improvement in the design of the Baja vehicle seat adjustability and comfort, steering wheel adjustment ergonomic analysis on body positioning and discomfort during and after
driving the Baja vehicle Analysis was done using CATIA human builder and computer aided
design manikins ninety-fifth percentile male fifth percentile female categories
RULA analysis used for an ideal reach envelope showed improvements in scores and ratings
Conclusion
References• Angeli, E., Wagner, J., Lawrick, E., Moore, K., Anderson, M., Soderlund, L., & Brizee, A. (2010, May 5).
General format. Retrieved from http://owl.english.purdue.edu/owl/resource/560/01/• Kamel, H. (2012, April 14). Car seat. Retrieved from http://grabcad.com/library/car-seat--6 • Kolich, Mike (June 23,2009). Repeatability, Reproducibility, and Validity of a New Method for
Characterizing Lumbar Support in Automotive Seating. Human Factors: The Journal of the Human Factors and Ergonomics Society, 51: 193. Retrieved from http://hfes.sagepub.com/content/51/2/193.html
• Kroemer, K., Kroemer, H., & Kroemer-Elbert, K. (2001). Ergonomics how to design for ease and efficiency. (2nd ed.). Upper Saddle River, New Jersey: Prentice Hall.
• Mansfield, N. J., & Marshall, J. M. (2001). Symptoms of musculoskeletal disorders in stage rally drivers and co-drivers. British Journal of Sports Medicine, 35(5), 314-20. Retrieved from http://search.proquest.com.ezproxy.libproxy.db.erau.edu/docview/194477661?accountid=27203
• Reed, M., Parkinson, M., & Chaffin, D. (2003). A new approach to modeling driver reach. SAE Technical Paper Series, Retrieved from http://www.openlab.psu.edu/papers/Reed2003a.pdf
• Rula analysis. (n.d.). Retrieved from http://maruf.ca/files/catiahelp/haaug_C2/haaugbt0100.htm. Society of Automotive Engineers. (2013). SAE International. Retrieved from http://www.sae.org/
• University of Maryland spine program a patient's guide lumbar herniated disc. (9, 28 2007). Retrieved from http://www.umm.edu/spinecenter/education/lumbar_herniated_disc.htm
• Whole-body vibration. (n.d.). Retrieved from http://www.tdi.texas.gov/pubs/videoresource/stpwhbody.pdf
• http://sae.multiview.com/userlogo/sae/ps/6803v3v1.jpg