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The ride values of seven cars(six passenger car and one RV car) are evaluated for 4 subjects based on the vibration of the bodies. And the seat qualities are investigated with the SEAT(seat effective amplitude transmissibility) value. The evaluated values are arranged as DB in html files. Since one of the most important parameters for ride comfort is the level and duration of the root mean square acceleration experienced, the acceleration responses of subjects are measured at 8 points on their bodies(3 Translational axes on the seat surface, 3 translational axes at the feet and 2 axes(x,z) at the backrest) when the subjects are excited by driving a vehicle on the road. The ride values such as the overall ride value, the component ride values and the seat effective amplitude transmissibility based on acceleration root mean square are evaluated for different seven vehicles using frequency weighting functions and axis multiplying factors.

The ride comfort in road vehicles and the drivers' fatigue are dependent on a complex combination of variables, including the vibration. In many study, ride comfort and driving fatigue are studied as an independent research area respectively. A subjective measures, as a general method, are used in evaluating them. Therefore, it is necessary to investigate the factors affecting drivers' ride comfort and fatigue in a scientific and systematic manner in order to provide the drivers with more safely operated automobiles and to prevent the traffic accidents due to fatigue. An evaluating system for ride quality and fatigue in vehicle is constructed. This system consists of a 12 axis vibration measurement module, an electromyography(EMG) measurement module and an ultrasonic 3D motion analyzer. In this study, we investigated the overall ride value of seven types of vehicle so as to choose the two vehicles which have a good or bad ride quality.

The ride values of passenger cars are investigated for Korean subjects based on the vibration of the human bodies. When three subjects are excited by driving a vehicle on road, their responses of acceleration are measured at 12 points on their bodies according to Griffin's 12 axis system (3 translational axes on a seat surface, 3 rotational axes on a seat surface, 3 translational axes at the seat back and the 3 translational axes at the feet). Since one of the most important parameters for ride comfort is the level and duration of the root mean square acceleration experienced, the ride values, such as the seat effective amplitude transmissibility, the component ride value, and the overall ride value based on acceleration root mean square are evaluated for different four vehicles using frequency weighing functions and axis multiplying factors. The ride indices are also studied considering to the seat dynamic characteristics with subjects.