This study is aimed at seat design optimization for high-speed train based on the Malaysians sitting anthropometry
data focusing on seat fit parameters. An analysis of anthropometry data composed of 15 dimensions that are
required in seat design was done with 50 male subjects. These data were collected through direct measuring
methods with standard equipment. According to the Malaysian automotive seat fit parameters, the backrest width,
backrest height, cushion width, and cushion length were established based on these anthropometric dimensions:
interscye breadth (5th percentile female and 95th percentile male), hip breadth (95th percentile female), sitting
shoulder height (5th percentile female), and buttock-popliteal length (5th percentile female), respectively. This
study uses the CATIA software to design and analyse the proposed seat design. The fit parameters proposed for the
new design are seat height, 380mm; cushion width, 450mm; backrest width, 450mm and backrest height, 850mm.
The CATIA human activity analysis (based on Rapid Upper Limb Analysis, RULA) was also executed. From the study,
the new conceptual seat design gives the most optimized fit when compared to the current seat.
This study was conducted to analyses the Biceps Brachii (BB) muscle contraction during different driving postures.
Drivers’ posture is one of the factors that contribute to driving fatigue that eventually may lead to road accident
and injuries. The experiment conducted for this study is using the surface electromyography (SEMG) method for
objective evaluation of muscle involved in driving activities. A total of 14 participants are involved in the
experiment. The experiment was done on three different posture based on comfortable angles published by previous
research. From the results analysis, the RMS value for activity left turn is lower than activity for right turn for all
three postures and results also shows that posture B with elbow angle of 134° is perceived as most comfortable
based on the lowest value of muscle contraction with a value of 15.67μV. The outcomes from this study are hoped to
benefit both manufactures and also car users in ensuring better and optimum driving postures that can avoid fatigue
and injuries.