Source identification by the coherence analysis of transient sound radiation

Tapio Lahti

Research output: Book/ReportReport

Abstract

Recent theoretical development in the field of partial coherence analysis of multiple input systems is reviewed. Relevant computational procedures for applying this theory to identifying sound radiation from transient noise sources are presented briefly. The procedures are used to analyse a tape recording of the surface acceleration and radiated noise of a punch press. Several multiple input systems are formed and analysed both with and without time delay compensation. The multiple coherences show that the chosen inputs represent well the sound radiation at frequencies of interest. The punch was found to be the dominating source at low frequencies. At higher frequencies also other sources could be identified.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages62
ISBN (Print)951-38-1371-1
Publication statusPublished - 1981
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
Number48
ISSN0358-5077

Fingerprint

punches
acoustics
radiation
tapes
time lag
recording
low frequencies

Cite this

Lahti, T. (1981). Source identification by the coherence analysis of transient sound radiation. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 48
Lahti, Tapio. / Source identification by the coherence analysis of transient sound radiation. Espoo : VTT Technical Research Centre of Finland, 1981. 62 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 48).
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Lahti, T 1981, Source identification by the coherence analysis of transient sound radiation. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 48, VTT Technical Research Centre of Finland, Espoo.

Source identification by the coherence analysis of transient sound radiation. / Lahti, Tapio.

Espoo : VTT Technical Research Centre of Finland, 1981. 62 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 48).

Research output: Book/ReportReport

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N2 - Recent theoretical development in the field of partial coherence analysis of multiple input systems is reviewed. Relevant computational procedures for applying this theory to identifying sound radiation from transient noise sources are presented briefly. The procedures are used to analyse a tape recording of the surface acceleration and radiated noise of a punch press. Several multiple input systems are formed and analysed both with and without time delay compensation. The multiple coherences show that the chosen inputs represent well the sound radiation at frequencies of interest. The punch was found to be the dominating source at low frequencies. At higher frequencies also other sources could be identified.

AB - Recent theoretical development in the field of partial coherence analysis of multiple input systems is reviewed. Relevant computational procedures for applying this theory to identifying sound radiation from transient noise sources are presented briefly. The procedures are used to analyse a tape recording of the surface acceleration and radiated noise of a punch press. Several multiple input systems are formed and analysed both with and without time delay compensation. The multiple coherences show that the chosen inputs represent well the sound radiation at frequencies of interest. The punch was found to be the dominating source at low frequencies. At higher frequencies also other sources could be identified.

M3 - Report

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Lahti T. Source identification by the coherence analysis of transient sound radiation. Espoo: VTT Technical Research Centre of Finland, 1981. 62 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 48).