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# Oregon State University Solar Vehicle Team - PowerPoint PPT Presentation

Oregon State University Solar Vehicle Team. Solar Car Mechanical Design. “How do you start the design of a new solar car?”. Mechanical Design. Maximize Power Input. Maximize efficiency (tractive force). Minimize drag. Slide 7 of 62. A variety of vehicle designs. Michigan. Bochum.

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### Oregon State University Solar Vehicle Team

“How do you start the design of a new solar car?”

Maximize Power Input

Maximize efficiency

(tractive force)

Minimize drag

Slide 7 of 62

Michigan

Bochum

Honda

MIT

Principia

Minnesota

Taiwan

OSU, First Car

Queens

OSU, Odyssey

• Solidworks 2012

• Computer Aided Drafting

• Solidworks Simulation 2012

• Finite Element Analysis

• Solidworks Flow Simulation 2012

• Computational Fluid Dynamics

• Maximum power with minimum drag:

• Lowest drag with maximum solar cell surface area

• Design process:

• Fit driver with body with max. surface area for cells (6 m2)

• Good rule of thumb is to go to maximum width and length allowed

• Wrap wheels, frame and suspension around driver inside body

• Optimize body

• Insert driver model

• Design solar car body, draw in “dummy wheels”

• Fit body to driver model, dummy wheels. Maximum low curvature array area

• Run wind tunnel testing (Computational Fluid Dynamics, Flow Simulation 2012)

• Evaluate drag force, power

• Evaluate cross sectional area vs. coefficient of drag

• Alter body shape

• Can be “arbitrary” change

• Repeat steps 3 and 4

www.xkcd.com/844

• 6.5.B Forward Vision:

• From the normal driving position, the driver must be able to see at all times, without artificial assistance, points at the following locations:

• (1) A point on the ground 8 m in front of the solar car

• (2) A minimum of 17° above the horizon on level ground

• (3) A full 100° to either side of center

• (4) The driver will be required to identify 40 mm high letters at a distance of 3 m through any of the required viewing angles.

• 6.1 Solar Car Dimensions

• The solar car (including solar array) may not exceed the following maximum dimensions when moving under its own power:

• (1) Length = 5.0 m

• (2) Height = 1.8 m

• (3) Width = 1.8 m

• 6.4.B Seating Position:

• The driver must be seated at less than or at a 27° angle, as measured in Appendix B. The driver’s head must be above and behind the driver’s feet. The seat must be appropriately constructed with a solid base and back rest.

• Best “body” initially designed with only driver, dummy wheels

• Must “reconcile” body with chassis, due to chassis, suspension members taking up space

• Remember:

• Aerodynamics most important

• Handling performance secondary

• Mass considerations secondary

• Build smallest chassis necessary to hold driver, wheels and withstand structural requirements

• 5G frontal, side, rear impact

• 4G roll over impact

• Verify chassis, suspension design with Finite Element Analysis (Solidworks Simulation 2012)

• Chassis/suspension will “poke out” of body

• Remake the body for least drag that will fit chassis tightly

• Tips for a “smoother” design process:

• All designs valid unless proven otherwise

• Burden of good design proof is upon designer

• Must meet all rules, or design is invalid

• Absolutely avoid qualitative assertions: quantitative discussions much more useful

• Offer constructive help, avoid criticism in general.

• “You could perhaps enhance your design by X,Y,Z” and not “Your design is failing in X, Y, Z!”

• Avoid stating absolutes, unless you can absolutely prove it!

• Go offline to compute numbers. Don’t argue with qualitative arguments: doing so will often result in circular discussions.

• Don’t be married to your own design if someone else’s design is better – we’re all in it together to make the best car possible!

• No place in solar car team for ego contests.

• Remember – you’re working with friends. Be friendly!!!