Team9_motorcycle_DesignReview_r2

Team9_motorcycle_DesignReview_r2 - Streamlined Motorcycle...

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Streamlined Motorcycle Documentation AAE 490T Design Build Test Team 9 Yohei Sugiyama John Meyers Robert Jacobs Matt Capria David Earle Matt Koehl March 10, 2004
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Mission Statement Our mission is to produce a fin for the streamlined motorcycle that will provide stability at high speeds with minimal drag. Background on Vertical Tails At high speeds a motorcycle is aerodynamically unstable. This is because the center of pressure is in front of the Center of Gravity. See figure 1 for the illustration: Figure 1. Graphical view of Forces. The center of pressure for the motorcycle without the vertical tail can be found using Loffing’s 1 data from the AAE 520 paper. From these tests, the moment coefficient and the side force are known. The side force occurs at the center of pressure, a distance away from the center of gravity, and the side force (C L ) enacts a moment about the body. This is shown in Equation 1. body cp SF M x F = (1) Force enacted upon the Center of Pressure Center of Gravity Center of Pressure
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Charting the moment versus angle of yaw, (Figure 2) the moment continually increases as the angle increases, creating an unstable system. A stable system is one in which the coefficient of moment decreases as the angle increases. Figure 2. Moment versus Angle of Yaw A stable system requires the center of pressure to be behind the center of gravity. When traveling at high velocities the motorcycle may be hit with a gust of wind. This can cause a sideways force to act on the motorcycle. The force along the entire body can be transformed into a single force acting at the center of pressure. The force will then create a moment about the center of gravity. Depending on the location of the center of pressure the motorcycle will either turn into the wind or turn with it. Knowing the location of the center of pressure is very important. When the center of pressure is in front of the center of gravity the resulting moment will turn the motorcycle with the wind. On the other hand when the center of pressure is located behind the center of gravity the motorcycle will turn in to the wind. The motorcycle is considered stable when the center of pressure is located behind the center of gravity.
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Team9_motorcycle_DesignReview_r2 - Streamlined Motorcycle...

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