An Australian case study on the estimation of heavy vehicle noise emission on grade
* Presenting author
Heavy vehicles are considered the primary determinant of night-time noise disturbance, particularly in rural areas or for residents along freight routes. To capture the dynamic influence of heavy vehicles associated with variation in speed on noise emission, heavy vehicle kinematic variables need to be incorporated within a road traffic noise emission model. These kinematic variables in turn assist with accurate estimation of engine noise and rolling noise. The American FHWA TNM road traffic noise model is the only existing prediction method that considers the driving speed profiles of articulated trucks. However, it can only consider a fixed set of speed profiles based on a single heavy vehicle power-to-weight ratio. As such, the current model is limited and does not accurately represent longer and heavier vehicle combinations. In this work, the FHWA TNM method is modified to include the kinematic equations for a heavy vehicle on grade. The model is applied to heavy vehicles commonly utilized in Australia. A case study based on a principal freight route in New South Wales, Australia, is presented to illustrate the predicted variation in engine noise and rolling noise throughout the heavy vehicle’s journey.