Estimation of bending wave intensity in beams using the frequency response technique

Jukka Linjama, Tapio Lahti

Research output: Contribution to journalArticleScientificpeer-review

42 Citations (Scopus)

Abstract

The frequency response approach is applied to the measurement of bending wave intensity, with two or four accelerometers being used. Based on the known structural intensity equations, a comprehensive set of frequency domain expressions is derived for power measurements in a beam. A practical procedure is developed for the general four-transducer method, which allows a usual dual channel FFT analyzer to be employed in multi-channel measurements. The procedure uses the sequential frequency response technique, and is applicable if the situation remains stationary during the data acquisition. In addition, expressions are derived for the determination of the force- and moment-related bending wave power components separately. In a laboratory experiment, the power carried by bending waves was measured in a simple beam, and the methods developed were tested and compared. The frequency response approach was shown to work well in detecting the total power. The estimation of the two bending wave power components, both in the near and the far field, was also demonstrated.
Original languageEnglish
Pages (from-to)21 - 36
Number of pages16
JournalJournal of Sound and Vibration
Volume153
Issue number1
DOIs
Publication statusPublished - 1992
MoE publication typeA1 Journal article-refereed

Fingerprint

frequency response
Frequency response
Wave power
Accelerometers
bending moments
Fast Fourier transforms
Transducers
Data acquisition
fast Fourier transformations
accelerometers
data acquisition
far fields
analyzers
transducers
Experiments

Cite this

Linjama, Jukka ; Lahti, Tapio. / Estimation of bending wave intensity in beams using the frequency response technique. In: Journal of Sound and Vibration. 1992 ; Vol. 153, No. 1. pp. 21 - 36.
@article{2ee35d37ebba4306a20d94f445000230,
title = "Estimation of bending wave intensity in beams using the frequency response technique",
abstract = "The frequency response approach is applied to the measurement of bending wave intensity, with two or four accelerometers being used. Based on the known structural intensity equations, a comprehensive set of frequency domain expressions is derived for power measurements in a beam. A practical procedure is developed for the general four-transducer method, which allows a usual dual channel FFT analyzer to be employed in multi-channel measurements. The procedure uses the sequential frequency response technique, and is applicable if the situation remains stationary during the data acquisition. In addition, expressions are derived for the determination of the force- and moment-related bending wave power components separately. In a laboratory experiment, the power carried by bending waves was measured in a simple beam, and the methods developed were tested and compared. The frequency response approach was shown to work well in detecting the total power. The estimation of the two bending wave power components, both in the near and the far field, was also demonstrated.",
author = "Jukka Linjama and Tapio Lahti",
note = "Project code: INS0203",
year = "1992",
doi = "10.1016/0022-460X(92)90624-7",
language = "English",
volume = "153",
pages = "21 -- 36",
journal = "Journal of Sound and Vibration",
issn = "0022-460X",
publisher = "Elsevier",
number = "1",

}

Estimation of bending wave intensity in beams using the frequency response technique. / Linjama, Jukka; Lahti, Tapio.

In: Journal of Sound and Vibration, Vol. 153, No. 1, 1992, p. 21 - 36.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Estimation of bending wave intensity in beams using the frequency response technique

AU - Linjama, Jukka

AU - Lahti, Tapio

N1 - Project code: INS0203

PY - 1992

Y1 - 1992

N2 - The frequency response approach is applied to the measurement of bending wave intensity, with two or four accelerometers being used. Based on the known structural intensity equations, a comprehensive set of frequency domain expressions is derived for power measurements in a beam. A practical procedure is developed for the general four-transducer method, which allows a usual dual channel FFT analyzer to be employed in multi-channel measurements. The procedure uses the sequential frequency response technique, and is applicable if the situation remains stationary during the data acquisition. In addition, expressions are derived for the determination of the force- and moment-related bending wave power components separately. In a laboratory experiment, the power carried by bending waves was measured in a simple beam, and the methods developed were tested and compared. The frequency response approach was shown to work well in detecting the total power. The estimation of the two bending wave power components, both in the near and the far field, was also demonstrated.

AB - The frequency response approach is applied to the measurement of bending wave intensity, with two or four accelerometers being used. Based on the known structural intensity equations, a comprehensive set of frequency domain expressions is derived for power measurements in a beam. A practical procedure is developed for the general four-transducer method, which allows a usual dual channel FFT analyzer to be employed in multi-channel measurements. The procedure uses the sequential frequency response technique, and is applicable if the situation remains stationary during the data acquisition. In addition, expressions are derived for the determination of the force- and moment-related bending wave power components separately. In a laboratory experiment, the power carried by bending waves was measured in a simple beam, and the methods developed were tested and compared. The frequency response approach was shown to work well in detecting the total power. The estimation of the two bending wave power components, both in the near and the far field, was also demonstrated.

U2 - 10.1016/0022-460X(92)90624-7

DO - 10.1016/0022-460X(92)90624-7

M3 - Article

VL - 153

SP - 21

EP - 36

JO - Journal of Sound and Vibration

JF - Journal of Sound and Vibration

SN - 0022-460X

IS - 1

ER -