Coinmonly used figure-of-merits for longitudinal road profiles such as the Intemational Roughness Index (IN) and the Ride Nuniber (RN) are based on statistical properties. Raw measured longitudinal road profile data may contain large trending components especially when the measurements are made with walking profilers in hilly regions. To obtain approximate stationary data suitable for statistic...

This paper focuses on crowd-based road condition monitoring using smart devices, such as smartphones and evaluates different strategies for aggregating multiple measurements (arithmetic mean and weighted means using R and RMSE) for predicting the longitudinal road roughness. The results con®rm that aggregating predictions from single drives leads to a higher model performance. This has been exp...

We have measured the surface topography and calculated the surface roughness power spectrum for an asphalt road surface. For the same surface we have measured the friction for a tire tread compound for velocities 10(-6) m s(-1) < v < 10(-3) m s(-1) at three different temperatures (at -8 °C, 20 °C and 48 °C). The friction data was shifted using the bulk viscoelasticity shift factor a(T) to form ...

Shock absorbers allow the damping of suspension vibrations, by dissipating kinetic energy. This energy theoretically can be harvested; however, practical solutions are not easily obtainable. This paper is dedicated to analyzing and evaluating the vibration energy in a vehicle’s suspension that is generated by road excitations. Also, it estimates the possible amount of harvested energy required ...

2 New Jersey Institute of Technology, Department of Physics, 161 Warren Street, Newark, New Jersey 07102, U.S.A. 3 To whom correspondence should be addressed. E-mail: [email protected] 4 National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 804013393, U.S.A. 5 JDS Uniphase Corporation, 100 Willowbrook Road, Freehold, New Jersey 07728-2879, U.S.A. 6 BTA Technology, 1982A ...