An analysis of vibration transmission to handlers trucks

Abstract

During movement of vehicles, drivers are subjected to vibrations transmitted by the engine, road irregularities, etc. They are extremely harmful for drivers and passengers. In this paper were studied and measured the vibrations accelerations transmitted by the vehicle when: the driver sits directly on the car seat and the driver sits on ergonomic seat cushion, in two cases: driving on asphalt and on macadam. The accelerometers were fixed on the floor, on the seat, on the lumbar area, on the cervical area and on the forehead, at eight male subjects of different BMI and ages. For these cases, were calculated the root mean square average vibration, the vibration dose value, the time period needed to reach the value of the exposure which triggers the action and the limit exposure value and the seat effective amplitude transmissibility for Aw and VDV. It was found that in all cases, seat cushion decreased the transmission of vibration, so the travelling conditions are improved. In these cases, the following results were obtained: If the driving occurs on asphalt, the root mean square average vibration measured at the forehead decreased by 9.09% and on macadam, the decrease was of 8%. VDV decreased by 20.69% on asphalt and on macadam, the decrease was of 14.81%. TEAV increased by 21% on asphalt and on macadam, the increase was of 18.12%. TELV increased by 21.05% on asphalt and on macadam, the increase was of 18.20%.