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DOE-Is the coasting speed of a bicycle related to tire pressure?
I am in Design of Experiments class and our assignment is to design a exp to see if the coasting speed of a bicycle is related to tire pressure. We need to test with different tire pressures and find the time over distance. Obviously there is a relation....but we need to set up a correlation coefficient for it. In the write up, we have to be able to guard the validity of the experiment and test the reliability of the experiment. And we also need to set up a scatter plot of the data.
Can someone tell me how to set this experiement up and what do I do with the results? The teacher I have is not very clear.
1 Answer
- 1 decade agoFavourite answer
Vailidity - keep the same bike and rider and position of the rider on the bike (this will help to reduce variability due to external conditions). Repeat several of the tire pressures throughout the experiment. This will tell you how reproducible your experiments are and will give you an idea about scatter.
Setting up the experiment - using the setup above, pick your tire pressures (althoug this really isn't a DOE since it is just one variable). You need to use at least three pressures (two would give you a straight line, three begins to tell you if there is curvature in the relationship). So you determine pressure and distance (shouldn't be too short so the bike can get to a coasting speed), measure time and calculate velocity. Now you can plot the velocity against the pressure and see the relationship. The repeat tests give you some idea of scatter.
Other things to consider: how does distance impact the results, how does speed due to the course impact your results, weight of the rider, acceleration changes, when to start and stop timing the test, etc.
Hope this helps ... good luck !
