United States Department of Transportation
i
Study to Establish Ride Comfort Criteria for High Speed Magnetically Levitated Transportation Systems
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1994-06-01
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[PDF-2.14 MB]
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Edition:Final Report July 1992 - July 1993
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Abstract:Advanced high speed fixed guideway transportation systems such as magnetic levitation systems have speed, acceleration,
and banking capabilities which present new guideway design issues. This increased performance results in new concerns
for passenger comfort, particularly with regard to vertical and lateral motions. If existing highway and other rights
of way are to be used to the fullest extent at the very high speeds of which these systems are capable, the ride comfort
concerns translate into limitations on changes in grade, curve radii, and the transition spirals used to enter the
curves. This report examines the effect of rolling, banking, and vertical motions on the ride comfort ratings of seated
passengers. The motions were produced using specific maneuvers in a small executive jet aircraft. The ride comfort
ratings were transformed to estimates of the probability that the passengers would ride again. Using a conservative
rule, the motion environment should be such that 95 percent of passengers would not hesitate to ride again. This 95
percent criterion was met when positive vertical accelerations were less than .30 g and negative vertical accelerations
were less than .20 g. In turning maneuvers, this occurred when roll rates were less than 7 degrees per second and bank
angles were less than 37 degrees. The data were also used to estimate the percentage of passengers who would not
hesitate to ride with roll rates up to 15 degrees per second, bank angles up to 40 degrees, and vertical accelerations
up to .25 g.
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