A short test method for sound insulation measurements between dwellings

Dissertation

Juhani Parmanen

Research output: ThesisDissertationMonograph

1 Citation (Scopus)

Abstract

Principles for the short test methods of sound insulation are reviewed and three actual test methods are analysed.They are divided into two basically different types.One is characterized by the use of only A weighting in sound pressure level measurements, the other includes also C weighted measurements.A mathematical model was constructed for both types of method.The model describes the actual measuring procedure and clarifies their differences.The (incident) source room spectrum was extended to include mathematically also the frequency dependence of the receiving room absorption.Thereafter, short test results could be studied by varying the extended spectrum only.Tests with real data showed that the method using also C weighting was superior to the A weighted method.A close connection was seen to problems in assessing hearing protectors for different types of spectra.The chosen spectral representation and manipulation yielded a new equation for hearing protector use, different from earlier statistical estimates.Finally, effects of the applied frequency weighting on short test results are discussed.Replacing the A weighting by the weighting of ISO 717 1982 or vice versa had no great effect on the test results.The choice between these weightings was shown to be also generally of secondary importance in the acoustical rating of structures.A specific sound reduction index was introduced and defined as the ideal result of the short test method.It was compared to the conventional sound reduction indices and deviations within the reference material were practically insignificant.But generally, the conventional indices were found to be obscure as to their physical and perceptual basis, and studies were carried out to see how the use of a physically better quantity instead of the former indices would influence the acoustical rating of structures.
Original languageEnglish
QualificationDoctor Degree
Awarding Institution
  • University of Helsinki
Award date14 Jun 1986
Place of PublicationEspoo
Publisher
Print ISBNs951-38-2592-2
Publication statusPublished - 1986
MoE publication typeG4 Doctoral dissertation (monograph)

Fingerprint

insulation
acoustics
protectors
ratings
hearing
rooms
sound pressure
manipulators
mathematical models
deviation
estimates

Keywords

  • sound insulation
  • dwellings
  • measurements
  • test methods
  • mathematical models

Cite this

Parmanen, J. (1986). A short test method for sound insulation measurements between dwellings: Dissertation. Espoo: VTT Technical Research Centre of Finland.
Parmanen, Juhani. / A short test method for sound insulation measurements between dwellings : Dissertation. Espoo : VTT Technical Research Centre of Finland, 1986. 72 p.
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abstract = "Principles for the short test methods of sound insulation are reviewed and three actual test methods are analysed.They are divided into two basically different types.One is characterized by the use of only A weighting in sound pressure level measurements, the other includes also C weighted measurements.A mathematical model was constructed for both types of method.The model describes the actual measuring procedure and clarifies their differences.The (incident) source room spectrum was extended to include mathematically also the frequency dependence of the receiving room absorption.Thereafter, short test results could be studied by varying the extended spectrum only.Tests with real data showed that the method using also C weighting was superior to the A weighted method.A close connection was seen to problems in assessing hearing protectors for different types of spectra.The chosen spectral representation and manipulation yielded a new equation for hearing protector use, different from earlier statistical estimates.Finally, effects of the applied frequency weighting on short test results are discussed.Replacing the A weighting by the weighting of ISO 717 1982 or vice versa had no great effect on the test results.The choice between these weightings was shown to be also generally of secondary importance in the acoustical rating of structures.A specific sound reduction index was introduced and defined as the ideal result of the short test method.It was compared to the conventional sound reduction indices and deviations within the reference material were practically insignificant.But generally, the conventional indices were found to be obscure as to their physical and perceptual basis, and studies were carried out to see how the use of a physically better quantity instead of the former indices would influence the acoustical rating of structures.",
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author = "Juhani Parmanen",
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language = "English",
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Parmanen, J 1986, 'A short test method for sound insulation measurements between dwellings: Dissertation', Doctor Degree, University of Helsinki, Espoo.

A short test method for sound insulation measurements between dwellings : Dissertation. / Parmanen, Juhani.

Espoo : VTT Technical Research Centre of Finland, 1986. 72 p.

Research output: ThesisDissertationMonograph

TY - THES

T1 - A short test method for sound insulation measurements between dwellings

T2 - Dissertation

AU - Parmanen, Juhani

PY - 1986

Y1 - 1986

N2 - Principles for the short test methods of sound insulation are reviewed and three actual test methods are analysed.They are divided into two basically different types.One is characterized by the use of only A weighting in sound pressure level measurements, the other includes also C weighted measurements.A mathematical model was constructed for both types of method.The model describes the actual measuring procedure and clarifies their differences.The (incident) source room spectrum was extended to include mathematically also the frequency dependence of the receiving room absorption.Thereafter, short test results could be studied by varying the extended spectrum only.Tests with real data showed that the method using also C weighting was superior to the A weighted method.A close connection was seen to problems in assessing hearing protectors for different types of spectra.The chosen spectral representation and manipulation yielded a new equation for hearing protector use, different from earlier statistical estimates.Finally, effects of the applied frequency weighting on short test results are discussed.Replacing the A weighting by the weighting of ISO 717 1982 or vice versa had no great effect on the test results.The choice between these weightings was shown to be also generally of secondary importance in the acoustical rating of structures.A specific sound reduction index was introduced and defined as the ideal result of the short test method.It was compared to the conventional sound reduction indices and deviations within the reference material were practically insignificant.But generally, the conventional indices were found to be obscure as to their physical and perceptual basis, and studies were carried out to see how the use of a physically better quantity instead of the former indices would influence the acoustical rating of structures.

AB - Principles for the short test methods of sound insulation are reviewed and three actual test methods are analysed.They are divided into two basically different types.One is characterized by the use of only A weighting in sound pressure level measurements, the other includes also C weighted measurements.A mathematical model was constructed for both types of method.The model describes the actual measuring procedure and clarifies their differences.The (incident) source room spectrum was extended to include mathematically also the frequency dependence of the receiving room absorption.Thereafter, short test results could be studied by varying the extended spectrum only.Tests with real data showed that the method using also C weighting was superior to the A weighted method.A close connection was seen to problems in assessing hearing protectors for different types of spectra.The chosen spectral representation and manipulation yielded a new equation for hearing protector use, different from earlier statistical estimates.Finally, effects of the applied frequency weighting on short test results are discussed.Replacing the A weighting by the weighting of ISO 717 1982 or vice versa had no great effect on the test results.The choice between these weightings was shown to be also generally of secondary importance in the acoustical rating of structures.A specific sound reduction index was introduced and defined as the ideal result of the short test method.It was compared to the conventional sound reduction indices and deviations within the reference material were practically insignificant.But generally, the conventional indices were found to be obscure as to their physical and perceptual basis, and studies were carried out to see how the use of a physically better quantity instead of the former indices would influence the acoustical rating of structures.

KW - sound insulation

KW - dwellings

KW - measurements

KW - test methods

KW - mathematical models

M3 - Dissertation

SN - 951-38-2592-2

T3 - Publications / Technical Research Centre of Finland

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Parmanen J. A short test method for sound insulation measurements between dwellings: Dissertation. Espoo: VTT Technical Research Centre of Finland, 1986. 72 p.