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# Modelling Workshop Mechanics 2: Problem

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The Modelling Workshop Mechanics 2 Problem of the Modelling Course of Industrial Design of the TU Delft

The Modelling Workshop Mechanics 2 Problem of the Modelling Course of Industrial Design of the TU Delft

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• 1. P-W-M-2: The Uno single wheel bike The Bike Courtesy of http://duasrodas.blog.br/2009/03/10/uno-a-moto-de-apenas-uma-roda/ Designer: Ben Gulak The UnoCycle® is a single-wheel, single-rider vehicle.
• 2. Question: Build a model to describe the vertical movement of the bike when it passes a road. Basedies the step, what will happen if he passes a bumpy road as 0.05\$ heaviside 0 C0.003\$ cos 50\$ t C0.001\$cos 100\$t . Try to change the "frequency" of the bumpy road and observe the behavior of the system 1st case: We choose 1. the mass of the bike wheel, is mw=3kg, the bike is mb= 17kg the mass of the rider is mr=60kg; 2. the bike is rigid except the tire, the spring constant of the tire is Kt=15000n/m, the damping coefficient of the tire is Ct=20; 3. there is a step in the road which is 5cm high; 4. to neglect the air friction. 2nd case: We choose 1. the mass of the bike wheel, is mw=3kg, the bike is mb= 17kg the mass of the rider is mr=60kg; 2. There is suspension system in the vertical direction between the wheel and the bike, the sping constant of the suspension system is Ks=10000n/m, the damping coefficient is Cs=200 3. the spring constant of the tire is Kt=15000n/m; the damping coefficient of the tire is Ct = 20; 4. there is a step in the road which is 5cm high, besides, the road is bumpy can be described as a function of time as y(t)=0.003\$ cos 50\$ t C0.001\$cos 100\$t in the vertical direction; 5. to neglect the air friction.