Measurement of the bending wave power flow by the structural intensity technique

Jukka Linjama, Tapio Lahti

Research output: Book/ReportReport


A literature survey is given on the theory of bending waves and power flow, measurement of the structural intensity, and its applications to machinery and buildings. Based on the known intensity measurement equations, a comprehensive set of frequency domain expressions is derived for bending wave intensity measurements in a beam. A practical procedure for the general 4-transducer method is developed, using the sequential 1-transducer frequency response technique. Also expressions are derived for the determination of the force- and moment-related power components separately. In a series of laboratory experiments the power carried by bending waves was measured in a simple beam, and the various developed configurations were tested and compared. The frequency response approach to detect the total power flow was shown to work well. The estimation of the force- and moment-related power components, both in the near- and the farfield, was also demonstrated.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages56
ISBN (Print)951-38-3351-8
Publication statusPublished - 1989
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports


  • acoustic measurement
  • vibration
  • sound transmission
  • power


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