RESUMO
Trains that tilt on curves can go faster, but passengers complain of motion sickness. We studied the control signals and tilts to determine why this occurs and how to maintain speed while eliminating motion sickness. Accelerometers and gyros monitored train and passenger yaw and roll, and a survey evaluated motion sickness. The experimental train had 3 control configurations: an untilted mode, a reactive mode that detected curves from sensors on the front wheel set, and a predictive mode that determined curves from the train's position on the tracks. No motion sickness was induced in the untilted mode, but the train ran 21% slower than when it tilted 8° in either the reactive or predictive modes (113 vs. 137 km/h). Roll velocities rose and fell faster in the predictive than the reactive mode when entering and leaving turns (0.4 vs. 0.8 s for a 4°/s roll tilt, P<0.001). Concurrently, motion sickness was greater (P<0.001) in the reactive mode. We conclude that the slower rise in roll velocity during yaw rotations on entering and leaving curves had induced the motion sickness. Adequate synchronization of roll tilt with yaw velocity on curves will reduce motion sickness and improve passenger comfort on tilting trains.
Assuntos
Aceleração/efeitos adversos , Enjoo devido ao Movimento/etiologia , Meios de Transporte , Humanos , Enjoo devido ao Movimento/fisiopatologia , MovimentoRESUMO
CME: Patients and Their Work at the General Practitioner's Abstract. Complaints related to occupational burden are more often presented to the General Practitioner than generally expected. Despite the fact that most of these work-related complaints do not qualify for recognition as occupational disease the family doctor is in the position to set the course for adequate therapeutic treatment and prevention. In order to consult his patients efficiently he must have a proper concept of the Health and Safety regulation at the workplace and he must know which social insurance plays which role in the concert.
Assuntos
Clínicos Gerais , Doenças Profissionais , Humanos , Masculino , Médicos de Família , Encaminhamento e ConsultaRESUMO
CME/Answers: Patients and Their Work at the General Practitioner's Abstract. Complaints related to occupational burden are more often presented to the General Practitioner than generally expected. Despite the fact that most of these work-related complaints do not qualify for recognition as occupational disease the family doctor is in the position to set the course for adequate therapeutic treatment and prevention. In order to consult his patients efficiently he must have a proper concept of the Health and Safety regulation at the workplace and he must know which social insurance plays which role in the concert.