An Investigation Of Infrasonic
In Traffic Flow Noise
Author(s)
P. Ilgakojis, E. Jotautiene, S. Merkevicius & J. Bazaras
Abstract
The society is aware of traffic noise and participates with local municipalities
and cities in solving the noise problems. Positive economic indicators can be
achieved when health is good. One of the important factors is restful sleep,
which can be interrupted by traffic noise. The increased use of wind energy by
windmills and various modes of transportation could increase the low frequency
sound that could have a negative effect on the population. When humans are
exposed to low frequency sound, only the high sound can be heard. The low
intensity infrasonic sound could affect human health and induce various
psychological disorders. The infrasonic sound could travel long distances and
penetrate the openings in a welling occupied by humans and interrupt rest and
sleep.
The infrasonic measurements were performed using the Brüel & Kjær
instrumentation. Components of infrasonic energy frequencies were obtained by
calculating the difference between the averaged sound pressure level and the Aweighted
sound pressure level. Aerodynamic turbulent noise propagations over
ground are affected by diffraction from jaggedness and stress viscosity from
secondary sound sources. The noise barriers are effective in the diffraction
process by reducing noise to the living environment. Measurements were
performed using acoustic barriers for traffic noise reduction in the suburbs. At 15
m from the highway, a 2 m high barrier was constructed and the measurements
were taken at 15 m and 45 m from the barrier. More intensive sound diffraction
was observed at the measurement distance of 45 m. These observations indicate
the importance of infrasonic diffraction and of the design of acoustic barriers for
the reduction of low frequency noise.
Keywords: traffic noise, infrasonic, noise barriers, diffraction.
Keywords
traffic noise, infrasonic, noise barriers, diffraction.
Related Book
Other papers in this volume
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