June 24, 2015 @ CNR, Modena, Italy
Stabilization Effect of Yaw Angle Misalignment in Sliding Friction
Ken Nakano
Faculty of Environment and Information Sciences, Yokohama National University,
79-7 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan
E-mail: [email protected]
A novel tribometer (i.e., the anti-vibration tribometer (AVT)) has been developed, which utilizes the
principle that a yaw angle misalignment (YAM) between the driving velocity "V" and the moving velocity
"x-dot" produces a positive damping effect to stabilize the equilibrium position to suppress frictional
vibration autonomously. For example, when a sliding contact between a steel ball and a steel plate is
lubricated by glycerol, the AVT provides a stable sliding motion at a YAM of φ = 30°, although strong
frictional vibration occurs at φ = 0° due to the velocity-weakening friction. By comparing the kinetic friction
coefficients obtained at φ = 0° and 30°, it has been found that frictional vibration leads to a serious error of
measuring kinetic friction coefficient (e.g., 40% underestimation at a low driving speed).