Capri Island helicopter noise control
Regular paper
INAIL - Italian workers Compensation Authority
Monday 1 june, 2015, 14:40 - 15:00
0.6 Madrid (49)
Abstract:
The purposes of the study, which aims to present, concern the disturbance
caused by the input noise related to the heliport LIQC Capri/Anacapri
DAMECUTA (40° 33'30.95''N 014 ° 12'04.76''E) activity, evaluating the noise
levels compliance with the normal tolerance criterion, within a receptor
located 100 mt.The helicopter noise is produced by various and complex
contributions, which is a mechanical aerodynamic Therefore, a proper
assessment of the noise, in the environmental impact study of "Airports,
Airfields and Heliports", plays an important role because the perception by
the exposed population is also influenced by subjective parameters.The
propagation of the sound of a helicopter is very special indeed in the
presence of natural barriers (helicopter at low altitude, wind and / or the
woods or hills between people and the helicopter), you can not see the
helicopter until it does not come to a few hundred meters away. While in the
countryside for people on the ground and the helicopter at high altitude and
there is no wind (or area with low background noise) the helicopter can be
heard several miles away.The sound level meter, based on the results of spot
measurements, is set in trigger mode with 70 dBA threshold level.
The level trigger is activated when Laf (ist) parameter, exceeds the level
set in the field for a start time greater than the set duration. The event
stops when Laf (ist) falls below the level set in the field stop in excess
of the duration time.
The measurement campaign has allowed while monitoring lasted 20 days, to
identify the total number of 220 events, attributable to takeoffs and
landings.
We also evaluated the time history and the spectral components of the events
landings and takeoffs. Furthermore, there was critical situations such as
the practice of the landing and take-off, leaving the engine running.
The paper concludes by analyzing the mitigation hypotheses.