vehicle-force-analysis

# vehicle-force-analysis - Design Parameters Those are...

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Design Parameters Those are parameters which you, as designers, are able to adjust within certain limits in order achieve a desirable performance: M : Total vehicle mass L : Length between the front and rear axles (Fig. 1) L F : Length between the front axle and the center of mass (Fig. 1) L R : Length between the rear axle and the center of mass (Fig. 1) h : Height of the center of mass from ground (Fig. 1) r F : Radius of front wheels (Fig. 1) r R : Radius of rear wheels (Fig. 1) e : Gear Train ratio Other System Parameters Those are parameters you can’t control, but need to have a good estimate of, in order to successfully predict the performance of your design. is the coefficient of (sliding) friction between the wheels surface and ground. Initially it is set to be 0.3 but you should conduct experiments using your wheels and the test rig in order to get a better estimate. is the frictional losses in the gearbox, bearings and other power-train components. A typical value would be 0.05 to 0.1 (5% to 10% losses), but you should conduct experiments using your own system in order to get a better estimate. Analysis for Front-Wheel Drive System In order to keep the analysis simple, the rotary inertia of the wheels will be ignored (which is a valid assumption assuming the wheels are fairly light compared to the total vehicle mass), as well as the frictional losses in the idling wheels (in this case, the rear wheels). While these simplifications still allow for good estimation of your vehicle performance, you should keep in mind that the acceleration capability of your vehicle will be slightly less than what this model predicts.

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## This note was uploaded on 03/21/2010 for the course MECHENG 250 taught by Professor Stevis during the Fall '09 term at University of Michigan.

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vehicle-force-analysis - Design Parameters Those are...

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