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Bike Braking Vibration Modelling And Measurement, Rob Redfield
Bike Braking Vibration Modelling And Measurement, Rob Redfield
U.S. Air Force Research
Modern bicycle disk-brake systems often induce vibration and noise in bike components such as brake rotors, wheels, and even bike frames. When the vibration or noise are excessive, brake performance can be perceived as unsatisfactory. Previous research incorporating bike frame structural dynamics and brake friction modeling has shown that stick-slip friction is likely the cause of much of this vibration and noise. Bicycle design parameters such as brake friction behavior and bike component structural properties are central in producing and/or sustaining these vibrations. The predicted dynamics of these models has correlated reasonably well with the testing of braking systems. This …
Mountain Bike Wheel Endurance Testing And Modeling, Robin C. Redfield, Cory Sutela
Mountain Bike Wheel Endurance Testing And Modeling, Robin C. Redfield, Cory Sutela
U.S. Air Force Research
Mountain bike wheels may be evaluated for durability and mode of failure using bump drum test machines that subject wheels to simulated rider loads and uneven terrain. These machines may operate at high speeds in order to accelerate failures, particularly during the design and prototype phase of wheel development. This paper describes a mathematical model of the dynamics of a wheel test drum assembly, and the validation of the model using data recorded during a wheel test. This model will subsequently be applied to better understand the key test operating parameters that must be controlled in order to produce repeatable …