Sound insulation in dwellings at low frequencies

  • Rindel, Jens Holger (Project Manager)
  • Poulsen, Torben (Project Participant)
  • Nielsen, Jesper Rye (Project Participant)

    Project Details

    Description

    This is a pilot project with the aim of throwing some light on the subjective evaluation of the annoyance of noise from neighbours, with a focus on low frequencies. The project was divided into field investigations and experiments in the laboratory. The field investigation was carried out by the Danish Building Research Institute in six selected housing areas. The laboratory experiment was carried out as a pilot project in order to investigate how the assessment of noise from neighbours is influenced by various factors. Twenty test persons have been asked to evaluate series of typical noise from neighbours, i.e. two kinds of airborne noise (music and the sound track from a film) and two kinds of impact noise (footfall noise with and without shoes). The noise examples were presented with two different shapings of the frequency spectrum in order to simulate either a heavy building construction or a typical lightweight construction. The noise examples were presented at four different levels and combined with two levels of background noise. The two frequency shapings were different in the frequency range 25 - 200 Hz, but identical at higher frequencies. Dose-response curves have been derived for annoyance, disturbance of concentration and subjective loudness. For annoyance was found a considerably steeper slope of the dose-response curve than for disturbance and loudness. 50 % of the subjects felt annoyed by the impact or airborne noise at a level of 28 or 27 dB(A), respectively. For both types of noise was found that the interval between 20 % and 80 % annoyed corresponded to a level difference of 16 dB. It was not possible to draw any firm conclusions about the influence of light or heavy building constructions, but the pilot project has given useful information for the design of future experiments on this topic. The main project is expected to start in 1997.
    StatusFinished
    Effective start/end date01/03/199531/03/1996