A Comparative Study of Ride Quality on Vibration Levels between MRT Blue Line (Ta Phra to Lak Song) and MRT Purple Line (Klong Bang Pai to Tao Poon)

Abstract

This paper was a comparative study of ride quality on vibration levels between MRT Blue Line (Ta Phra to Lak Song) and the MRT Purple Line (Klong Bang Pai to Tao Poon) using Wertungzahl (Wz) values derived from accelerations in longitudinal, vertical, and lateral directions. The accelerations of the rail vehicles were measured while traveling through the MRT Blue line (Ta Phra to Lake Song, totaling 38 stations) and the MRT Purple line (Klong Bang Pai to Tao Poon, totaling 18 stations). The ride quality was calculated according to ISO. The results indicated that both lines achieved acceptable ride quality in all three directions based on the above measures, while there were notable differences, viz. the ride quality of the MRT Blue Line was 19.4% better in longitudinal direction and 23.72% better in lateral direction than those of the MRT Purple Line, while the ride quality of the MRT Purple Line was 1.62% better in vertical direction than that of the MRT Blue Line. The major findings of this study might be beneficial for designing the MRT projects in the future.