Damping Determination by Half-Power Bandwidth Method for a Slightly Damped Rectangular Steel Plate in the Mid-Frequency Range


  • Marcell Ferenc Treszkai Széchenyi István University, Department of Whole Vehicle Development, 9026 Győr, Hungary
  • David Sipos Széchenyi István University, Department of Whole Vehicle Development, 9026 Győr, Hungary
  • Daniel Feszty Széchenyi István University, Department of Whole Vehicle Development, 9026 Győr, Hungary




vibroacoustic measurements, damping loss factor, DLF, Statistical Energy Analysis


This paper presents a novel methodology for measuring the Damping Loss Factor (DLF) of a slightly damped plate in the mid-frequency range (400-1000 Hz) by the Half Power Bandwidth Method (HPBM). A steel flat plate of 650 x 550 x 2 mm was considered as the test case, which was excited by both a shaker and an impact hammer to quantify the effect of the excitation type for slightly damped plate. Since the HPBM is based on extracting the damping data from the modal resonance peaks, working with the correct Frequency Response Functions (FRF) was found to be a crucial factor. Therefore, the effects of coherence and resolution of the sampling frequency were examined in detail in the measurements. The obtained DLF results were statistically analysed and then applied in SEA simulations. Comparison of the simulation and experimental results showed that the method of extracting the DLF data from the measurements can have as much as 10 dB influence on the simulation results. The best results, with only 2 dB difference between measurement and simulation, were obtained when the statistical expected value of the data was used as the input in the SEA simulations.


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R. H. Lyon, R. G. DeJong, Theory and Application of Statistical Energy Analysis, 2nd Edition, Butterworth-Heinemann, Oxford, 1995.

J. Petrik, R. Fiedler, P. Lepsík, Loss factor estimation of the plywood materials, JVE International LTD. Vibroengineering Procedia 7 (2015) pp. 1554-1563.

M. Bustamante, S. N. Y. Gerges, E. F. Vergara, J. P. Arenas, High Damping Characteristics of an Elastomer Particle Damper, International Journal of Acoustics and Vibration 21 (1) (2016) pp. 112-121. doi: https://dx.doi.org/10.20855/ijav.2016.21.1401

M. B. Mandale, P. Bangarubabu, S. M. Sawant, Damping Loss Factor Estimation by Experimental Method for Plate with Conventional and Composite Materials, International Journal on Design & Manufacturing Technologies 9 (2) (2015) pp. 6-13. doi: http://dx.doi.org/10.18000/ijodam.70152

A. A. Jadhav, S. R. Desai, Estimation of Damping Loss Factor (DLF) for Automotive Glass, Journal of Basic and Applied Engineering Research 2 (6) (2015) pp. 435-438.

R. Cherif, J-D. Chazot, N. Atalla, Damping Loss Factor Estimation of Two-Dimensional Orthotropic Structures from a Displacement Field Measurement, Journal of Sound Vibration 356 (2015) pp. 61-71. doi: https://doi.org/10.1016/j.jsv.2015.06.042

M. Jaber, H. Schneeweiss, J. Bös, T. Melz, Measurement of the Damping Properties of Carbon Composite Plates by the Power Input Method, Proceedings of ISMA2014 Including USD2014, EMVeM, 2014 pp. 1445-1458.

L. Zoghaib, P-O. Mattei, Damping Analysis of a Free Aluminum Plate, Journal of Vibration and Control 21 (11) (2015) pp. 2083-2089. doi: https://doi.org/10.1177/1077546313507098

N. Schiller, R. Cabell, F. Grosveld, Impact of Damping Uncertainty on SEA Model Response Variance, Noise-Con 2010, Baltimore, Maryland, 2010. April 19-21.

R. Cabell, N. Schiller, A. Allen, M. Moeller, Loss Factor Estimation Using the Impulse Response Decay Method on a Stiffened Structure, Inter-Noise 2009, Ottawa, Canada, 2009. August 23-26.

N. K. Mandal, R. A. Rahman, M. S. Leong, Experimental Study on Loss Factor for Corrugated Plates by Bandwidth Method, Ocean Engineering (31) (2004) pp. 1313-1323. doi: https://doi.org//10.1016/j.oceaneng.2003.08.003

M. Iwaniec, Damping Loss Factor Estimation in Plates, Molecular and Quantum Acoustics (24) (2003) pp. 61-68.

P. R. Mantena, Frequency-Domain Vibration Analysis for Characterizing the Dynamic Mechanical Properties of Materials, 1996 ASEE Annual Conference Proceedings, Session 1626, 1996.

S. A. Hambric, S. H. Sung, D. J. Nefske, Engineering vibroacoustic analysis, Methods and Applications, John Wiley & Sons, Ltd., Chichester, West Sussex, United Kingdom, 2016.

Siemens LMS Help guide, 2019.

The Fundamentals of Modal Testing, Application Note 243-3 Agilent Technologies, 2000.

N. H. Baharin, R. A. Rahman, Effect of accelerometer mass on thin plate vibration, Jurnal Mekanikal, (29) (2009) pp. 100–111.

W. Desmet, B. Pluymers,O. Atak, "MID-FREQUENCY" - CAE Methodologies for Mid-Frequency Analysis in Vibration and Acoustics, Katholieke Universiteit Leuven - Faculty of Engineering, (2012) pp. 233-262.

A. Grzadziela, M. Kluczyk, Application of coherence functions of vibroacoustic signals from piston engines, recorded in set states, for their technical evaluation, Journal of Polish CIMAP 7 (2) (2012) pp. 55-64.

MECAS ESI Group, VA One Users’ Guide, 2018.




How to Cite

Treszkai, M. F., Sipos, D., & Feszty, D. (2020). Damping Determination by Half-Power Bandwidth Method for a Slightly Damped Rectangular Steel Plate in the Mid-Frequency Range. Acta Technica Jaurinensis, 13(3), 177–196. https://doi.org/10.14513/actatechjaur.v13.n3.545



Acta Technica Jaurinensis