Assessing the Impact of Speed and Type of Road Surface on the Noise Level in a Passenger Car Cabin

Abstract

This paper presents a study of noise pollution in the cabin of a passenger car in the context of various types of road. The purpose of the study is to understand how the type of road surface can influence the levels of noise inside the car. Sound pressure levels were measured on the A-scale of a sound level meter for 3 types of road surface - crushed stone pavement, asphalt, and cobblestone. The study was conducted at varying speeds of the car within the range of 10-60 km/h. Due to limitations of homogeneous road conditions, a duration of 10 seconds was chosen for each measurement. The sound level meter was placed at a selected measuring point, close to the driver’s head. On the data collected in the above-mentioned way, various regression models have been developed to assess the impact of speed and type of road surface on the noise level. It was found that the noise level increases with the roughness of the road surface, and the resulting risks were analysed.