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Home » Suspension Design » The Suspension System for Solar Miner I |
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PARENT CATEGORY Suspension Design |
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LINKED PROFILES University of Missour... |
ARTICLE
The Suspension System for Solar Miner I OCID cn00000150 |
LINKED CATEGORIES Suspension Design |
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The Suspension System for Solar Miner I by Steven Belarde created 4/9/2002 submitted 4/9/2002 05:26:10 PM I designed the suspension system for Solar Miner I. From research derived from the GM Sunraycer I designed the suspension system for Solar Miner I. From research derived from the GM Sunraycer, desirable qualities of damping and springiness needed to be found. The ride frequency for both the "jounce" (up and down motion) and the "pitch" (rotation of the car about its transverse axis) was selected to be 2.4 Hz. (it is interesting to note that the GM Sunraycer selected a frequency of 2.6 Hz to. They selected this value to avoid those ride frequencies that cause diziness, fatigue, and motion sickness). This ride frequency was used in conjunction with the following equation to determine the appropriate rear and front spring constants of the solar vehicle: (k1 + k2 - w*wm) * (k1*l1*l1 + k2*l2*l2 - w2*J)-(k1*l1 - k2*l2)^2 = 0 where k1 = equivalent stiffness of rear suspension springs k2 = equivalent stiffness of front suspension springs m = vehicle's mass l1 = horizontal distance from center of mass to centerline of rear axle. l2 = horizontal distance from center of mass to the front axle. J = Polar Moment of inertia of vehicle about a transverse axis through its mass center. To solve this equation, a spreadsheet was created to track the weight and location of each individual object within the vehicle. a coordinate system was created where solar cat members could estimate the weight and location of various objects within the car. After and while the data was collected, the spreadsheet calculated the center of gravity, the polar moment of inertia, and total mass of vehicle (to simplify the computation, the polar moment of inertia of an individual object about itself was ignored). Through an iterative process, the spreadsheet determined the roots of the polynomial equation (above) as various spring contants changed. Using a predefined condition where the two frequencies (w) must average 2.4 Hz, a front and rear spring constant was selected. In our case, we had a spring constant of 300 and 100 lb/in. This spring constant was the Equivalent Spring Constant. When selecting the actual physical spring, we took into consideration the suspension's geometry and actual spring constant to achieve the equivalent spring constant. Perhaps when I have time I'll tell how we selected our shock obsorbers. 398 words | belarde
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