BBC RD 1971-15

form without the written permission of the. British Broadcasting Corporation. It uses SI units in accordance with B.S. document PD 5686. A.N. Burd, B.Sc., F.Inst.P.
745KB taille 2 téléchargements 215 vues
UDC 534.845. 2

RESEARCH DEPARTMENT

REPORT

Low-frequency sound absorbers No.

Research Department, Engineering Division

THE BRITISH BROADCASTING CORPORATION

1971/15

Published by BBC Research & Development Kingswood Warren Tadworth Surrey KT20 6NP England http://www.bbc.co.uk/rd

RESEARCH DEPARTMENT

LOW-FREQUENCY SOUND ABSORBERS

Research Department Report No. 1971/15 UDC 534.845.2

This Report may not be reproduced in any form without the written permission of the British Broadcasting Corporation It uses SI units in accordance with B.S. document PD 5686

A.N. Burd, B.Sc., F.Inst.P. (PH-70)

Head of Research Department

Research Department Report No. 1971/15

LOW-FREQUENCY SOUND ABSORBERS

Section

Title

Page

Summary

......................................................

1

1.

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

2.

Panel absorbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

3.

Modular shape of absorber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2

4.

Pre-fabricated absorbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

5.

Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

6.

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

Appendix:

5

(PH-70)

Absorber characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I.

Impedance measurements

......................................

5

II.

Enclosure construction

......................................

5

III.

Influence of adhesives

......................................

6

IV.

Studio measurements

......................................

6