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Journal articles on the topic 'Experimental modal analysi'

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Author: Grafiati

Published: 14 March 2023

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1

Dušek, J., M. Dohnal, and T. Vogel. "Numerical analysis of ponded infiltration experiment under different experimental conditions." Soil and Water Research 4, Special Issue 2 (March 19, 2010): S22—S27. http://dx.doi.org/10.17221/1368-swr.

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One of the most important properties, affecting the flow regime in the soil profile, is the topsoil saturated hydraulic conductivity (<I>K<SUB>s</SUB></I>). The laboratory-determined <I>K<SUB>s</SUB> </I>often fails to characterise properly the respective field value; the <I>K<SUB>s</SUB> </I>lab estimation requires labour intensive sampling and fixing procedures, difficult to follow in highly structured and stony soils. Thus, simple single- or double-ring ponded infiltration experiments are frequently performed in situ to obtain the field scale information required. In the present study, several important factors, affecting the infiltration rate during the infiltration experiments, are analysed using three-dimensional axisymmetric finite-element model S2D. The examined factors include: (1) the diameter of the infiltration ring, (2) the depth of water in the ring, (3) the depth of the ring insertion under the soil surface, (4) the size and the shape of the finite-element mesh near the ring wall, and (5) the double- vs. single-ring setup. The analysis suggests that the depth of the ring insertion significantly influences the infiltration rate. The simulated infiltration rates also exhibit high sensitivity to the shape of the finite-element mesh near the ring wall. The steady-state infiltration rate, even when considering a double-ring experiment, is significantly higher than the topsoil saturated hydraulic conductivity. The change of the water depth in the outer ring has only a small impact on the infiltration rate in the inner ring.

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2

Yılmaz, Murat, and Murat Uysal. "TRAPEZ SACLARIN TİTREŞİM DAVRANIŞLARININ SONLU ELEMANLAR VE DENEYSEL MODAL ANALİZLERİYLE İNCELENMESİ." e-Journal of New World Sciences Academy 16, no. 2 (April 25, 2021): 7–19. http://dx.doi.org/10.12739/nwsa.2021.16.2.2a0186.

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3

Huňady, Róbert, František Trebuňa, Martin Hagara, and Martin Schrötter. "The Use of Modan 3D in Experimental Modal Analysis." Applied Mechanics and Materials 486 (December 2013): 36–41. http://dx.doi.org/10.4028/www.scientific.net/amm.486.36.

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Experimental modal analysis is a relatively young part of dynamics, which deals with the vibration modes identification of machines or their parts. Its development has started since the beginning of the eighties, when the computers hardware equipment has improved and the fast Fourier transform (FFT) could be used for the results determination. Nowadays it provides an uncountable set of vibration analysis possibilities starting with conventional contact transducers of acceleration and ending with modern noncontact optical methods. In this contribution we mention the use of high-speed digital image correlation by experimental determination of mode shapes and modal frequencies. The aim of our work is to create a program application called Modan 3D enabling the performing of experimental modal analysis and operational modal analysis. In this paper the experimental modal analysis of a thin steel sample performed with Q-450 Dantec Dynamics is described. In Modan 3D the experiment data were processed and the vibration modes were determined. The reached results were verified by PULSE modulus specialized for mechanical vibration analysis.

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4

覃, 海懂. "The Experimental Modal Analysis of Five-Storey Building Scale Model." Hans Journal of Civil Engineering 06, no. 03 (2017): 272–79. http://dx.doi.org/10.12677/hjce.2017.63031.

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5

Pauwels, Steven, Jan Debille, Jeff Komrower, and Jenny Lau. "Experimental Modal Analysis: Efficient Geometry Model Creation Using Optical Techniques." Journal of the IEST 49, no. 2 (October 1, 2006): 104–13. http://dx.doi.org/10.17764/jiet.49.2.1210836g31831777.

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Experimental modal analysis (EMA) is widely used to characterize the dynamic properties of structures. Recently EMA is being used on more complex structures often involving hundreds of measurement points. Modal analysis results are frequently used in combination with numerical models, imposing higher standards on the quality of the modal parameter estimation and the accuracy of the geometry models. These requirements are often contradictory to the availability of test cells and prototypes. In order to solve this challenge, innovative solutions using optical techniques have been developed that simplify and accelerate the creation of a geometrical model of a test object, while at the same time increase the accuracy of measured coordinates. Industrial applicability of these techniques is proven by a number of benchmarks on real-life structures.

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6

Sochacki, Wojciech. "An Experimental Modal Analysis of the Laboratory Truck Crane Model." PAMM 4, no. 1 (December 2004): 416–17. http://dx.doi.org/10.1002/pamm.200410189.

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7

Bermúdez, Carlos, Cristian Sosa, and Annie Planchart. "Polidocanol versus absolute alcohol as sclerosing substances in experimental animal model." Anales de la Facultad de Ciencias Médicas (Asunción) 51, no. 2 (August 30, 2018): 69–78. http://dx.doi.org/10.18004/anales/2018.051(02)69-078.

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8

Katsumi, Toshiyuki, and Satoshi Kadowaki. "ICONE23-1030 EXPERIMENT/ANALYSIS OF DEFLAGRATION AND ESTABLISHMENT OF ACCELERATION MODEL IN FLAME PROPAGATION." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2015.23 (2015): _ICONE23–1—_ICONE23–1. http://dx.doi.org/10.1299/jsmeicone.2015.23._icone23-1_19.

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9

Żółtowski, Mariusz, and Krzysztof Napieraj. "Experimental modal analysis in research." Budownictwo i Architektura 16, no. 3 (December 1, 2017): 005–12. http://dx.doi.org/10.24358/bud-arch_17_163_01.

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Experimental modal analysis has grown steadily in popularity since the advent of the digital FFT spectrum analyser in the 1970’s. This days impact testing has become widespread as a fast and economical means of finding the vibration modes of a machine or structure. Its significantly use ascending roles can be seen also in the civil engineering industry [6]. This paper reviews the main topics associated with experimental modal analysis including making FRF measurements, modal excitation techniques, and modal parameter estimation from a set of FRFs.

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10

Ravina, Enrico, Paolo Silvestri, and Antonino Airenti. "Experimental modal analysis of bows." Journal of the Acoustical Society of America 123, no. 5 (May 2008): 3659. http://dx.doi.org/10.1121/1.2934970.

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11

Worden, K., and G. R. Tomlinson. "Nonlinearity in experimental modal analysis." Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences 359, no. 1778 (January 15, 2001): 113–30. http://dx.doi.org/10.1098/rsta.2000.0716.

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12

Snoeys, R., P. Sas, W. Heylen, and H. Van der Auweraer. "Trends in experimental modal analysis." Mechanical Systems and Signal Processing 1, no. 1 (January 1987): 5–27. http://dx.doi.org/10.1016/0888-3270(87)90080-x.

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13

Thasneem, M. Murshida, Prince Thankachan, and T. M. Madhavan Pillai. "Computational and Experimental Modal Analysis of a Three Storied Building Model." IOP Conference Series: Materials Science and Engineering 936 (October 10, 2020): 012018. http://dx.doi.org/10.1088/1757-899x/936/1/012018.

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14

Zanarini, Alessandro. "Full field optical measurements in experimental modal analysis and model updating." Journal of Sound and Vibration 442 (March 2019): 817–42. http://dx.doi.org/10.1016/j.jsv.2018.09.048.

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15

Badea, Francisco, JesusAngel Perez, and JoseLuis Olazagoitia. "Beam T-junction Model Accuracy Improvement Based on Experimental Modal Analysis." International Journal of Automotive Technology 23, no. 6 (December 2022): 1537–45. http://dx.doi.org/10.1007/s12239-022-0134-7.

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16

Budiharti, Nelly, ING Wardana, and Bambang Sugiyono Agus Purwono. "Analysis of Variance Using Three Factor Experimental Design with a Fixed and Random Model for Indonesian Soybean Production." Journal of Advanced Research in Dynamical and Control Systems 11, no. 11 (November 20, 2019): 163–68. http://dx.doi.org/10.5373/jardcs/v11i11/20193182.

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17

MARITA, Masao. "Modal Test Reference Selection for Experimental Modal Analysis." Transactions of the Japan Society of Mechanical Engineers Series C 65, no. 636 (1999): 3161–66. http://dx.doi.org/10.1299/kikaic.65.3161.

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18

Fei, W., X. Ll, L. j. Shl, and Y. b. Yang. "A Separation Modal Method of Experimental Modal Analysis." Shock and Vibration Digest 23, no. 8 (August 1, 1991): 18–20. http://dx.doi.org/10.1177/058310249102300803.

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19

Cara, Javier. "Computing the modal mass from the state space model in combined experimental–operational modal analysis." Journal of Sound and Vibration 370 (May 2016): 94–110. http://dx.doi.org/10.1016/j.jsv.2016.01.043.

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20

Chengjian, Fan, and Guan Dihua. "The quantitative analysis and experimental verification of the tire static enveloping model using experimental modal parameters." Vehicle System Dynamics 44, no. 9 (September 2006): 675–88. http://dx.doi.org/10.1080/00423110600560789.

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21

Xu, Jun Chen, Ming Hong, and Hong Yu Cui. "The Contrast Experimental Study on Operational Modal Analysis of Ship Structural Model." Applied Mechanics and Materials 226-228 (November 2012): 241–46. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.241.

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A ship is a large and multifunctional marine structure operating on the sea. In practice, the environmental noise on a ship has many complicated components and they influence the vibration of the ship structure. Besides the stochastic excitations such as waves and winds, there are also propeller- and host-induced harmonic excitations. In this paper, NExT/ERA algorithm program and a ship model have been made to realize the modal parameters identification of ship structure in the presence of both white noise and harmonic excitations. Moreover, whether the signal filtering technology has a great effect on the results of modal analysis is discussed. In order to study and analyze the influence of the harmonic excitations, experiments under different signal-to-noise ratio (SNR) conditions have been carried out. This has a guiding significance to the engineering practice.

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22

Roig, R., O. De La Torre, E. Jou, B. Mulu, and X. Escaler. "Experimental and numerical modal analysis of a reduced scale Kaplan turbine model." IOP Conference Series: Earth and Environmental Science 1037, no. 1 (June 1, 2022): 012006. http://dx.doi.org/10.1088/1755-1315/1037/1/012006.

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Abstract This paper presents an experimental modal test of a Kaplan turbine model and provides the corresponding analysis of the results. The modal test of the rotor including the runner, the shaft and the generator was performed using, as exciters, an impact hammer and a shaker and, as sensors, several accelerometers. Additionally, numerical models of the rotor with the runner surrounded by air (dry condition) or submerged in water (wet condition) were also built. By comparing the numerical and experimental results, the main modes of vibration of a runner blade in dry conditions and of the rotor shaft both in dry and wet conditions have been identified and discussed. The most significant deviations between experimental and numerical natural frequencies were found around 10% for the rotor shaft and around 6% for the runner blade. Moreover, it was observed that the fourth mode of vibration presents the highest added mass effect with a Frequency Reduction Ratio of about 6.7% and the second mode of vibration shows the lowest damping ratios in both dry and wet conditions with values of about 1.5 and 2.1%, respectively.

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23

Barnaba, A., F. Bucchi, P. Neri, and D. Passarelli. "Experimental modal analysis of SSR1 cryomodule for numerical model tuning and validation." IOP Conference Series: Materials Science and Engineering 1038, no. 1 (February 1, 2021): 012077. http://dx.doi.org/10.1088/1757-899x/1038/1/012077.

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24

Ouisse, Morvan, and Emmanuel Foltête. "Model correlation and identification of experimental reduced models in vibroacoustical modal analysis." Journal of Sound and Vibration 342 (April 2015): 200–217. http://dx.doi.org/10.1016/j.jsv.2014.12.042.

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25

Inácio, Octávio, and Rui Ribeiro. "An experimental modal analysis on the coimbra model of the Portuguese guitar." Journal of the Acoustical Society of America 138, no. 3 (September 2015): 1936. http://dx.doi.org/10.1121/1.4934109.

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26

Venglar, Michal, and Milan Sokol. "Experimental modal analysis of diagonal members." Vibroengineering PROCEDIA 23 (April 25, 2019): 110–14. http://dx.doi.org/10.21595/vp.2019.20671.

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27

Ozdoganlar, O. Burak, B. D. Hansche, and T. G. Carne. "Experimental modal analysis for microelectromechanical systems." Experimental Mechanics 45, no. 6 (December 2005): 498–506. http://dx.doi.org/10.1007/bf02427903.

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28

Lieven, Nick A. J., and D. J. Ewins. "The context of experimental modal analysis." Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences 359, no. 1778 (January 15, 2001): 5–10. http://dx.doi.org/10.1098/rsta.2000.0710.

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29

Hammond, Joseph K., and Timothy P. Waters. "Signal processing for experimental modal analysis." Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences 359, no. 1778 (January 15, 2001): 41–59. http://dx.doi.org/10.1098/rsta.2000.0713.

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30

Rades, M. "Frequency Domain Experimental Modal Analysis Techniques." Shock and Vibration Digest 17, no. 6 (June 1, 1985): 3–15. http://dx.doi.org/10.1177/058310248501700603.

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31

Guan, D. H., L. H. Yam, M. P. Mignolet, and Y. Y. Liy. "TECHNIQUES: EXPERIMENTAL MODAL ANALYSIS OF TIRES." Experimental Techniques 24, no. 6 (November 2000): 39–45. http://dx.doi.org/10.1111/j.1747-1567.2000.tb01348.x.

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32

Kang, Seung-Kyu, Wan-Suk Yoo, Jae-Wook Lee, Gyung-Hun Nho, and Hyun-Woo Kim. "59297 Experimental validation of a ball-balancer model for washing machines using FSI analysis methods(Fluid-Structure Interaction in MBS)." Proceedings of the Asian Conference on Multibody Dynamics 2010.5 (2010): _59297–1_—_59297–5_. http://dx.doi.org/10.1299/jsmeacmd.2010.5._59297-1_.

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33

Kozlova, Yu V., A. V. Kosharnij, M. A. Korzachenko, and I. V. Kytova. "Retrospective Analysis and Current State of Experimental Models of Blast-induced Trauma." Ukraïnsʹkij žurnal medicini, bìologìï ta sportu 5, no. 6 (December 12, 2020): 66–71. http://dx.doi.org/10.26693/jmbs05.06.066.

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Combat pathology, particularly mine-blast injury is the main cause of military casualties. In our country, as a factor of destabilization, are widely used terrorist attacks using explosive devices of different capacities. Blast injury over 60% is cause of military casualties during armed conflicts. It is known that the condition for the formation of air-shock wave is creating waves of pressure, which is distributed at supersonic speed as possible with pulsed gas explosion and expansion of compression ambient air. The brain, chest, abdomen, and bladder are the most sensitive parts of the human body to blast. But the pathogenesis, diagnosis, treatment and rehabilitation of post-traumatic explosion-induced disorders, namely, neurodegenerative complications psychosomatic, cognitive impairment, currently not fully understood and are not clear enough for an adequate therapy. The purpose of the study was to analyze the advantages and disadvantages of experimental models of blast-induced injury and to improve method and compressed air-driven shock tube. Material and methods. We used the following methods: analysis and evaluation of experimental models of explosion-induced injury by scientific publications, monographs and invention obtained in stages patent information search in the library collection of the State institution "Dnipropetrovsk Medical Academy of the Ministry of Health of Ukraine" (October 2019), a retrospective search of the literature database PubMed (February 2020). Results and discussion. A retrospective analysis of the number of literary sources on the experimental reproduction of explosive trauma has shown a high interest of a large circle of scientists in the last decade. A qualitative study of scientific publications has shown a wide range of physical characteristics of an experimental shock wave, methods and devices for simulating an explosive injury. The absence of a standardized model of explosive injury with characteristics as close as possible to real circumstances creates conditions for the implementation of our own proposals. Conclusion. This work presents a tested modified experimental model for reproducing an air shock wave under laboratory conditions, which makes it possible to study the features of the course of an explosive injury of various organs and organ systems at various periods after injury

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34

Hosseinlou, F., A. Mojtahedi, and M. A. Lotfollahi. "Finite Element Model Updating of an Offshore Jacket Platforms using Experimental Modal Analysis." Journal of Computational Methods In Engineering 36, no. 1 (September 1, 2017): 67–96. http://dx.doi.org/10.18869/acadpub.jcme.36.1.67.

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35

OKADA, Yohji, Takashi TAKAHI, Kenichi MATSUDA, and Kazuo YAMANAKA. "Multivariable discrete model identification of vibrating structure and application to experimental modal analysis." Transactions of the Japan Society of Mechanical Engineers Series C 55, no. 517 (1989): 2348–53. http://dx.doi.org/10.1299/kikaic.55.2348.

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36

Lee, Ying-Chih, Bor-Tsuen Wang, Yi-Shao Lai, Chang-Lin Yeh, and Rong-Sheng Chen. "Finite element model verification for packaged printed circuit board by experimental modal analysis." Microelectronics Reliability 48, no. 11-12 (November 2008): 1837–46. http://dx.doi.org/10.1016/j.microrel.2008.07.068.

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37

Langer, Patrick, Christian Guist, Kheirollah Sepahvand, and Steffen Marburg. "Modal analysis of vehicle engine-transmission unit: Finite element model and experimental investigation." Journal of the Acoustical Society of America 141, no. 5 (May 2017): 3908. http://dx.doi.org/10.1121/1.4988809.

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38

De Bruyne, Stijn, Herman Van der Auweraer, Bart Peeters, Jan Anthonis, Matteo Appolloni, and Alessandro Cozzani. "Model Based Control of a Multi-Axis Hydraulic Shaker using Experimental Modal Analysis." IFAC Proceedings Volumes 45, no. 16 (July 2012): 524–28. http://dx.doi.org/10.3182/20120711-3-be-2027.00400.

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39

A. Rosly, N., M. Y. Harmin, and D. L. A. A. Majid. "Preliminary investigation on experimental modal analysis of high aspect ratio rectangular wing model." International Journal of Engineering & Technology 7, no. 4.13 (October 9, 2018): 151. http://dx.doi.org/10.14419/ijet.v7i4.13.21348.

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Procedure of conducting an experimental modal analysis (EMA) of roving hammer test for high aspect ratio (HAR) wing containing geometric nonlinearities is presented along with consideration of various tip store sizes. Two sets of test setups of vertical and horizontal arrangements have been considered, which respectively demonstrates the undeformed and deformed cases. Modal properties in terms of natural frequency and mode shape were experimentally measured using the LMS Test.Lab package and the results were then compared between the undeformed and its corresponding deformed configuration. From the finding, it confirms that the chordwise and torsional modes of the undeformed configurations has respectively turned into chordwise-torsion and torsion-chordwise modes as they are in deformed configuration. Meanwhile, the impact related to bending modes is insignificant. Hence, this may result in inaccurate prediction if conventional aeroelastic solution is employed for HAR wing configuration.

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40

D’Souza, Janice B., and Sangarapillai Kanapathipillai. "Experimental and computational validation of a scaled train tunnel model using modal analysis." Frontiers of Mechanical Engineering 8, no. 4 (December 2013): 420–28. http://dx.doi.org/10.1007/s11465-013-0281-7.

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41

Liu, Wen, Teng Jiao Lin, and Quan Cheng Peng. "Modal Analysis and Experimental Research of Marine Gearbox." Applied Mechanics and Materials 607 (July 2014): 405–8. http://dx.doi.org/10.4028/www.scientific.net/amm.607.405.

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The gear-shaft-bearing-housing coupled finite element model of marine gearbox was established by using the truss element, the spring element and the tetrahedral element. The modal of gearbox was analyzed by using the ANSYS software. Then through the experimental modal analysis, the natural frequencies of gearbox are obtained. Compare the experimental results with the numerical results, it shows good agreement.

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42

KUWABARA, Hiroki, Takahiko ITO, Yuichi TANABE, Mitsuo IWAHARA, Akio NAGAMATSU, and Masayuki TAKAHASHI. "21315 Experimental modal analysis and operational modal analysis which use strain gauge." Proceedings of Conference of Kanto Branch 2007.13 (2007): 469–70. http://dx.doi.org/10.1299/jsmekanto.2007.13.469.

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43

Camelio, P., B. Campisi, A. M. Carro-Diaz, V. Lazzeri, B. Waegell, and R. Phan-Tan-Luu. "Experimental research methodology for a model of glass transition temperature for acrylates and methacrylates." Analusis 26, no. 8 (October 1998): 67–70. http://dx.doi.org/10.1051/analusis:199826080067.

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44

Li, Xiao Peng, Hao Guo, Jing Nian Liu, and Ya Li Liu. "Modal Analysis and Experimental Analysis of Dynamic Characteristics of Linear Rolling Guide." Advanced Materials Research 482-484 (February 2012): 2360–64. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.2360.

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The finite element model of the liner rolling guide of the CNC machine tool is established. Then the natural frequencies and the corresponding vibration modes of the liner rolling guide (LRG) are obtained by analyzing the finite element model (FEM) of the linear rolling guide in two different boundary conditions. By comparing the modal characters of the two states it is proved that the movable joint and bolted interfaces of the rail have certain effects on the dynamic performance of linear rolling guide. Besides, the liner rolling guide also have been tested dynamically, obtaining the modal parameters of the rail guide; finally, the validity of finite element model and the effect of boundary conditions on the interface of the linear rolling guide are verified by comparing the finite element analysis of frequency and experimental analysis of frequency

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45

Ellinger, Johannes, Leopold Beck, Maximilian Benker, Roman Hartl, and Michael F. Zaeh. "Automation of Experimental Modal Analysis Using Bayesian Optimization." Applied Sciences 13, no. 2 (January 10, 2023): 949. http://dx.doi.org/10.3390/app13020949.

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The dynamic characterization of structures by means of modal parameters offers many valuable insights into the vibrational behavior of these structures. However, modal parameter estimation has traditionally required expert knowledge and cumbersome manual effort such as, for example, the selection of poles from a stabilization diagram. Automated approaches which replace the user inputs with a set of rules depending on the input data set have been developed to address this shortcoming. This paper presents an alternative approach based on Bayesian optimization. This way, the possible solution space for the modal parameter estimation is kept as widely open as possible while ensuring a high accuracy of the final modal model. The proposed approach was validated on both a synthetic test data set and experimental modal analysis data of a machine tool. Furthermore, it was benchmarked against a similar tool from a well-known numerical computation software application.

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46

Wang, Li Jun, and Zhi Yang Pan. "Experimental Modal Analysis of Fan Vibration Frequency." Applied Mechanics and Materials 138-139 (November 2011): 395–98. http://dx.doi.org/10.4028/www.scientific.net/amm.138-139.395.

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Fan is used for pneumatic conveying grain in the 4ZTL-1800 combine harvester threshing prior to cutting. In order to decrease power consume of it, the experimental modal analysis of fan was done by using hammer-hitting pulse-inspirit method. The natural frequencies of fan vibration is obtained, which is contrasted with inspirit frequency of fan, then resonance vibration of fan is found and its frequency is at 125Hz, which verifies the result of the experimental modal analysis.The results are beneficial to decrease power consume of fan.

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47

Ying, Mei, and Fan Rui. "Experimental Modal Analysis in Casting Production Applications." Advanced Materials Research 189-193 (February 2011): 4028–32. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.4028.

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The experimental modal analysis (EMA) applied in vibrating solidification and vibrating ageing of the cast iron elements has been discussed in this paper. The stimulating frequency、excitation area(wave crest)、supporting area and the way of excitation of this cast iron element can be chosen accurately according to the eigenvalue of vibration parameters and the dynamic display of the measurement. If multiple excitation is needed，the principle natural frequency can be adjusted according to the dynamic display as the partial differences and the characteristics change of the elements. The experiment shown that using EMA excitation parameters can get a better technical effect than those of static solidification、heat ageing or other experience excitation ageing. Vibrating solidification can make a fine crystalline and the hardness of the full section is relative high; Vibrating ageing can get a better stress distribution and raise the ability of anti-deformation.

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48

Delprete, Cristiana, A. Galeazzi, and F. Pregno. "Experimental Modal Analysis of an Automotive Powertrain." Applied Mechanics and Materials 24-25 (June 2010): 71–76. http://dx.doi.org/10.4028/www.scientific.net/amm.24-25.71.

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The work is devoted to study the dynamic properties of a powertrain, performing an experimental modal analysis (EMA). The aim is to determinate structural modes and frequency response function (FRF) using an experimental approach. Two types of excitation mechanism are applied and compared for the EMA: a modal exciter (electromagnetic shaker system) and an impact hammer. Both the analyses with modal shaker and with impact hammer are carried on measuring the acceleration of the structure in the same set of eighty-one points. In both cases, the excitation is performed along three directions (vertical, lateral and longitudinal with respect to the structure). The two different modal analysis methodologies are described, and results (modal parameters such as natural frequencies, damping ratios and modal shapes are identified with commercial software) are compared. The comparison is made in term of result accuracy, reliability and testing time required.

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49

Whear, F. R., and D. Morrey. "A Technique for Experimental Acoustic Modal Analysis." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 210, no. 2 (March 1996): 143–51. http://dx.doi.org/10.1243/pime_proc_1996_210_181_02.

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Abstract:

A technique developed to carry out experimental acoustic modal analysis using commercially available structural modal analysis software is described. This uses a finite difference calculation to determine the spatial variation in pressure. In order that the resulting function exhibits the same nodes and antinodes as the actual pressure distribution at resonance, a second-order finite difference calculation is performed to obtain the second spatial derivative. This is implemented in practice using a three side-by-side microphone probe with an analogue differential amplifier. The technique is verified by measuring the natural frequencies and mode shapes of a bare rectangular office. These results are compared with analytical calculations and output from a finite element model. The results show very good agreement for all modes in the frequency range of interest.

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Liang, Z., and D. J. Inman. "Matrix Decomposition Methods in Experimental Modal Analysis." Journal of Vibration and Acoustics 112, no. 3 (July 1, 1990): 410–13. http://dx.doi.org/10.1115/1.2930526.

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