Effect of Shock Vibrations Due to Speed Control Humps to the Health of City Bus Passengers Using Oscillatory Model with Six DOF

Speed control humps (SCH) are one of the most efficient means used in streets to slow down the vehicle flow, thus improving traffic safety. An analysis is made of the effects of shock vibrations on passengers due to the driving of the typical city bus over the humps. The evaluation procedure estimates accelerations on occupants' seats as the value influencing their health. Peak vertical accelerations of passengers are calculated as the response of a flat longitudinal oscillatory model of the bus with six degrees of freedom (DOF) while passing over three types of SCHs. Simulation is carried out through a program written in Matlab, and ISO 2631-5 Standard evaluation method and criteria are used. The results show that passengers' health, particularly of those using seats on rear platform, may be jeopardized even after one pass over the 5 cm high rounded profile hump at speed of 15 km/h.