Contents: 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001

2002, 6

A. G. Troshin

Structural energy flows in water filled pipes: implementation of measurement technique based on PVDF reusable strain gauges

language: English

received 17.05.2002, published 01.07.2002

Download article (PDF, 500 kb, ZIP), use browser command "Save Target As..."
To read this document you need Adobe Acrobat © Reader software, which is simple to use and available at no cost. Use version 4.0 or higher. You can download software from Adobe site (http://www.adobe.com/).

ABSTRACT

The purpose of this work is an implementation the newly developed measurement technique for structural energy estimation in-situ. The technique based on reusable PVDF strain gauges in measurement of structural energy flows transferred by longitudinal and shear forces, bending and torsional moments in water filled pipes are presented and discussed. Developed technique was implemented for determination of the efficiency of noise control means in the pipeline with the test rig "Flow". The technique also applied in order to determine the components of vibrational energy flows generated by pump incorporated into the rig "Impedance". Measurements were performed when real pumps have been run. The relationships between four structural components in pipe walls and water ones transferred with plane waves in the pipe channel were determined. Degree of uncertainty in proposed technique was revealed using error analyses taking into account the real data about coherence function and measured phase angle between force/moment and linear/angular velocity. The reliability of preformed measurements at tonal components of structural energy spectra proofed employing an error analyses and energy balance calculation in pipe cross section. The possibilities and limitations of the technique were addressed.

15 pages, 14 figures

Сitation: A. G. Troshin. Structural energy flows in water filled pipes: implementation of measurement technique based on PVDF reusable strain gauges. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2002, 6.

REFERENCES

[1] J. W. Verheij. Multi path sound transfer from resiliently mounted shipboard machinery. Teschnisch Physische Dienst TNO-TH Delft, 1982.
[2] R. J. Pinnington, R. G. White. Power flow through machine isolators to resonant and non resonant beams. J of Sound and Vib. 75 (1981) 179-197.
[3] Fahy F. J. Measurement of acoustic intensity using the cross-spectral density of two microphone signals. JASA 62(4) 1057-9, 1977.
[4] Chung J. V. Cross-spectral method of measurement acoustic intensity without error caused by instrument phase mismatch JASA 64(6), 1613-1616, 1978.
[5] G. Pavic. Technique for determination of vibration transmission mechanism in structures. Dissertation. Institute of sound and Vibration Research, Faculty of Engineering and Applied Science, University of Southampton, 1976.
[6] A. G. Troshin and V. I. Popkov. Measurement of Vibration Power flow in rod structures by using piezo-electric film sensors. 4-th International Congress on Structural Intensity Technique, Senlis, France, 1993, pp. 169-174.
[7] C. R. Helkyard, B. R. Mace. A wave approach to structural intensity in beams. 4-th International congress on intensity technique, Senlis, France, 1993, August 31-September 2, pp. 183-191.
[8] A. G. Troshin, M. A. Sanderson and L. Ivarsson. Vibration Isolation of Structure borne power transmission by fans in Building: a theoretical and experimental examination using Mobility and Complex Transmissibility methods, Report S 97-06, Gothenburg, December 1997, Department of Applied Acoustics, Chalmers University of Technology.
[9] A. G. Troshin. Summation-subtraction device for a six degrees of freedom of motion transducer comprised of six linear accelerometers Gothenburg, September 1997, Report S 97-05, Release Note Department of Applied Acoustics, Chalmers University of Technology.
[10] A. F. Seybert. Statistic error in acoustic intensity measurement. J of Sound and Vib. 75 (1981) 585-595.


 

Andrey G. Troshin - PhD, Acoustic Expert and Team Leader. R&D department Noise reduction and active noise control, IT Magic Co. Ltd
4rd WonWooBldg, 907-16 Deachi-dong, Gangnam-gu Seoul, Republic of Korea, Homepage: http://www.itmagic.co.kr/, Fax 82-2-538-7255, Tel: 82-2-538-8011, Mobile: 82-16-297-7253
e-mail: atroshin(at)yahoo.com