Aanvullend geluidonderzoek schermen en viaducten voor Tracébesluit Ring Utrecht

The barrier effect of roadside diffracting elements for standard noise calculations

By using elements with quarter-wavelength resonators of different depths alongside a road, noise can be diffracted upwards to create a zone of noise reduction behind these elements. Measurements at a short distance, up to 15 meters, have proven that a noise reduction up to 4 dB(A) can be achieved. The noise reduction at long distance, up to 600...

Vector sensors and acoustic calibration procedures

The measurement of underwater sound for the purpose of environmental impact studies usually only involves the measurement of the sound pressure by hydrophones. Sea mammals are sensitive to sound pressure in water like land mammals are for sound pressure in air. However, some species of fish and invertebrates are also sensitive and responsive to...

Calculating traffic noise reduction at long distance using diffracting elements

A series of resonators alongside a road or railway can be used to diffract noise upwards to create a zone of noise reduction behind the elements. The company 4Silence developed the so-called Whisstone, a concrete block with 18 resonators of different depths designed to operate in a broad frequency range. Several measurements at short distance,...