A STUDY ON BUS MOTION PROFILE ANALYSIS
This is a study to discover bus motion patterns affected by bus driving by measuring on the rigid structure of the bus. We have developed an analytical technique to compare these bus motion behavioral patterns between low-floor single deck, high-floor single deck and double deck (upper and lower deck) by using cumulative distribution function and root mean square values on lateral, longitudinal and vertical axis. This analytical technique determined the motion profile of three bus types represented by g Force on three dimensional axes using tri-axial accelerometer sensor with measuring frequency of 10Hz. The three bus types are high-floor single deck and double deck bus are primarily used for long distance travelling on express highways and low-floor single deck bus is used as stage buses in cities and towns. The findings in this study have identified motion characteristics of the three bus types by focusing on three dimensional axis. From the lateral g Force distribution, there is slight higher g Force value for low-floor single deck compared to high-floor single deck bus. The double deck bus showed the least lateral g Force distribution. The lowfloor single deck also shows highest g Force distribution for longitudinal motion compare to the other bus types. This is expected for the low-floor single deck bus as the nature of the bus route will need more steering, braking and accelerating motions compared to the other bus routes. However, on the vertical motion the results showed significantly high for the high-floor single deck bus at higher bus speed (velocity) which means the passenger may experience bumpiness compared to other bus types.