@article{ref1,
title="Ride-quality models for diverse transportation systems",
journal="Transportation research record",
year="1980",
author="Richards, Larry G. and Jacobson, Ira D. and Pepler, Richard D.",
volume="774",
number="",
pages="39-45",
abstract="This research was undertaken to develop comfort (ride-quality) models for six specific vehicles and to refine an existing composite ride-quality model. The vehicles were an automated guideway transit vehicle, a short-haul intercity rail vehicle, an urban rapid rail vehicle, a luxury-type charter bus, a compact car, and a subcompact automobile. Experiments on most vehicles were conducted in two phases: model development and model validation. In both phases, physical variables were measured for a series of ride segments, and each segment was rated for comfort level by a group of paid subjects. The important determinants of comfort for most vehicles were roll, pitch, and vertical acceleration. These variables are highly intercorrelated; all load on the same principal component of the motion-correlation matrix. Two composite ride-quality models are presented; one has four variables (roll, pitch, and vertical and longitudinal acceleration) and one has two variables (vertical acceleration and roll). The two-variable comfort model is sufficient for most uses.<p />",
language="en",
issn="0361-1981",
doi="",
url="http://dx.doi.org/"
}