Monday July 10, 2006
Bullet on Wheels Aims for 24-Hour Human-Powered Vehicle RecordA Canadian designer used SolidWorks(R) and COSMOS(R) software to develop and optimize a human-powered vehicle that will attempt the 24-hour distance record in July. Capable of more than 60 miles per hour, the machine is essentially a recumbent bicycle - one where the rider lies on his back - encapsulated in an aerodynamic carbon fiber fairing.
The "Critical Power" resembles an eight-foot long bullet and will be the pilot's mobile home for at least 22 hours during the record attempt.
Greg Kolodziejzyk, a top 10 age-group finisher in several Ironman triathlons, will assail the 11-year-old record of 1,021.36 km (634.6 miles) sometime between July 19 and 24, depending on weather. The retired computer imaging entrepreneur chose the Redwood Acres Motor Speedway in Eureka, Calif., as his venue after evaluating 19 other tracks in North America for climate, surface, and layout.
"SolidWorks and COSMOS software helped us develop what we are convinced is a superior design from aerodynamic, mechanical, and ergonomic standpoints," said Designer Ben Eadie, owner of MountainWave Design Services in Calgary, Alberta, Canada. "But the proof will be laid down on the track."
Eadie optimized the vehicle's aerodynamics by creating a "virtual wind tunnel" with COSMOSFloWorks(TM) computational fluid dynamics analysis software. He accomplished this by calibrating COSMOSFloWorks settings for turbulence, relative density, percentage error, and interactive elements with the solid body. After testing a series of established human-powered vehicle designs, he settled on an entirely new design that tapers to a thin vertical wedge in the stern. This shape serves to part the air and gently reassemble it with minimal turbulence.
The vehicle's shape resembles that of a fish. "We didn't start out thinking 'fish,' but when my designs follow nature, I always feel like I'm headed in the right direction," said Eadie. "Natural selection is probably the best design optimization process you can hope for." The virtual wind tunnel's findings correlated by more than 98 percent with calculations experienced on the track.
COSMOSWorks analysis software helped Eadie determine the amount of carbon fiber required for the shell design. It graphically highlighted hot spots that needed reinforcement and cold spots where a layer or two of fiber could safely be removed.
Eadie started the design process two and a half years ago with a photograph of Kolodziejzyk in a position that leveraged the powerful pedal stroke the triathlete had refined over thousands of miles of training. Eadie superimposed the photo onto a SolidWorks drawing, resulting in an ultra-efficient design allowing only single millimeters of clearance in all directions. The bike literally fits like a glove.
Eadie has used SolidWorks software since 1999 to develop the Critical Power as well as more traditional recumbent bicycles and special projects ranging from hydrogen fuel cells to diaper-changing tables. "With every release SolidWorks continues to prove why it is the most robust 3D CAD tool for designing better products, whether in carbon fiber, structural steel, plastics, or sheet metal," Eadie said.
Added Kolodziejzyk, "I don't know where SolidWorks and COSMOS leave off and where Ben's expertise begins, but the machine is fast. Now it's all up to me."
The record attempt is sanctioned by the International Human Powered Vehicle Association. To hear a conversation with Kolodziejzyk and Eadie, listen to the podcast at http://www.solidworks.com/mediapodcast.
For more information on the record attempt, visit Kolodziejzyk's Web site at http://www.adventuresofgreg.com/HPVMain.html.
Text courtesy of SolidWorks
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