Localisation of low frequency noise pollution areas in industrial environments

Regular paper

Lola Garcia Escribano

Microflown Technologies

Wednesday 3 june, 2015, 14:40 - 15:00

0.9 Athens (118)

Low frequency noise and infrasound noise are growing issues in the industrialized world. Such noises are mainly generated by the heavy industry, power plants, wind turbines etc. Being ever present in our everyday life, this phenomena is still heavily underestimated, and its long term impact on the human health and well-being is largely unknown. Due to the nature of the noise sources under investigation, the problem of their localisation becomes a cumbersome task. Traditionally the problem of localizing noise sources in the very low frequency range, could only be addressed by the employment of large sound pressure-based beamforming arrays. However, the limitations of such instrumentation renders it useless for low frequency applications. Currently the problem of noise assessment at very low frequencies was reduced to the determination of its sound pressure level. In this paper, a new measurement system, based on a 2D particle velocity sensor along with a monitoring station, is presented. The combination of both particle velocity elements allows for successful localisation of noise sources in the acoustic far field, without any frequency limitations. Furthermore, the system is able to monitor and visualize the behavior of a noise source, as well as highlight the temporal patterns and trends that it follows. Results presented in this paper are an outcome of an investigation carried out, in cooperation with the city-hall of Veendam, on a real measurement case. The aim of the measurement was to locate the source of a 30 Hz noise problem, which was reported as “annoying” by the local community.

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