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Abstract

The Antarctic Peninsula region has experienced a recent cooling for about 15 years since the beginning of the 21st century. In Livingston Island, this cooling has been of 0.8°C over the 12-yr period 2004–2016, and of 1.0°C for the summer average temperatures over the same period. In this paper, we analyse whether this observed cooling has implied a significant change in the density of the snowpack covering Hurd and Johnsons glaciers, and whether such a density change has had, by itself, a noticeable impact in the calculated surface mass balance. Our results indicate a decrease in the snow density by 22 kg m-3 over the study period. The density changes are shown to be correlated with the summer temperature changes. We show that this observed decrease in density does not have an appreciable effect on the calculated surface mass balance, as the corresponding changes are below the usual error range of the surface mass balance estimates. This relieves us from the need of detailed and time-consuming snow density measurements at every mass-balance campaign.

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Authors and Affiliations

Cayetana Recio-Blitz
Francisco J. Navarro
Jaime Otero
Javier Lapazaran
Sergi Gonzalez
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Abstract

The finite element method (FEM) using Ansys program (APDL) was used in this study to evaluate the idea of tuned vibration absorbers applied to a beam construction for the undamped system. The ideal location for the Dynamic Vibration Absorbers (DVAs) and their numbers to be installed on the fixed-fixed beam in order to lessen beam vibration was also investigated. The DVA was coupled to the fixed-fixed beam vibration node for three vibration modes. The natural frequency and frequency response of the beam were calculated in this study using modal and harmonic analysis, respectively. The vibrational characteristics of the F-F beam with and without DVAs were presented. The simulation results demonstrated that the vibration amplitude decreases in the presence of the DVAs and its reduction depends on the locations of the DVAs and its number. In addition, the attached DVAs affect the structural beam vibration. Depending on the modes of vibration, the vibrational peak is the optimal place to attach DVA.
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Bibliography

[1] C.Y. Wang and C.M. Wang. Structural Vibration: Exact Solutions for Strings, Membranes, Beam and Plate. CRC Press, 2014.
[2] S.S. Rao. Mechanical Vibrations, 4th ed. Pearson Prentice Hall, 2005.
[3] D.J. Inman. Engineering Vibrations, 3rd ed. Prentice Hall, 2008.
[4] C.L. Lee, Y.T. Chen, L.L. Chung, and Y.P. Wang. Optimal design theories and applications of tuned mass dampers. Engineering Structures, 28(1):43–53. 2006. doi: 10.1016/j.engstruct.2005.06.023.
[5] J.R. Sladek and R.E. Klingner. Effect of tuned-mass dampers on seismic response. Journal of Structural Engineering, 109(8):2004–2009, 1983. doi: 10.1061/(ASCE)0733-9445(1983)109:8(2004).
[6] K.T. Tse, K.C. Kwok, and Y. Tamura. Performance and cost evaluation of a smart tuned mass damper for suppressing wind-induced lateral-torsional motion of tall structures. Journal of Structural Engineering, 138(4):514–525, 2012. doi: 10.1061/(ASCE)ST.1943-541X.0000486.
[7] H. Shi, R. Luo, P. Wu, J. Zeng, and J. Guo. Application of DVA theory in vibration reduction of the car body with suspended equipment for high-speed EMU. Science China Technological Sciences, 57(7):1425–1438, 2014. doi: 10.1007/s11431-014-5558-5.
[8] M.H. Zainulabidin and N. Jaini. Transverse vibration of a beam structure attached with dynamic vibration absorbers: Experimental analysis. International Journal of Engineering \amp; Technology, 12(6):82–86, 2012.
[9] N.A.M. Jusoh. Finite Element Analysis of a Beam Structure Attached with Tuned Vibration Absorbers. Ph.D. Thesis, University Tun Hussein Onn Malaysia, 2015.
[10] M.M. Salleh and I. Zaman. Finite element modelling of fixed-fixed end plate attached with a vibration absorber. Applied Mechanics and Materials,773-774:194–198, 2015. doi: 10.4028/www.scientific.net/AMM.773-774.194.
[11] W.S. Ong and M.H. Zainulabidin. Vibration Characteristics of beam structure attached with vibration absorbers at its vibrational node and antinode by finite element analysis. Journal of Science and Engineering, 1(1):7–16, 2020. doi: 10.30650/jse.v1i1.519.
[12] M.H.B. Zainulabidin and N. Jaini. Vibration analysis of a beam structure attached with a dynamic vibration absorber. Applied Mechanics and Materials. 315:315–319, 2013. doi: 10.4028/www.scientific.net/AMM.315.315.
[13] S.A.M. Rozlan, I. Zaman, S.W. Chan, B. Manshoor, A. Khalid, and M.S.M. Sani. Study of a simply-supported beam with attached multiple vibration absorbers by using finite element analysis. Advanced Science Letters, 23(5):3951–3954, 2017. doi: 10.1166/asl.2017.8302.
[14] S.K. Sharma, R.C., Sharma, J. Lee, and H.L. Jang. Numerical and experimental analysis of {DVA} on the flexible-rigid rail vehicle car body resonant vibration. Sensors, 22(5):1922, 2022. doi: 10.3390/s22051922.
[15] C.L. Bacquet and M.I. Hussein. Dissipation engineering in metamaterials by localized structural dynamics. arXiv preprint arXiv:1809.04509, 2018.
[16] M.V. Bastawrous and M.I. Hussein. Theoretical band-gap bounds and coupling sensitivity for a waveguide with periodically attached resonating branches. Journal of Sound and Vibration, 514:116428, 2021. doi: 10.1016/j.jsv.2021.116428.
[17] L. Cveticanin and G. Mester. Theory of acoustic metamaterials and metamaterial beams: an overview. Acta Polytechnica Hungarica, 13(7):43–62, 2016.
[18] Y. Song, J. Wen, H. Tian, X. Lu, Z. Li, and L. Feng. Vibration and sound properties of metamaterial sandwich panels with periodically attached resonators: Simulation and experiment study. Journal of Sound and Vibration, 489:115644, 2020. doi: 10.1016/j.jsv.2020.115644.
[19] Y. Sun, J. Zhou, D. Gong, and Y. Ji. Study on multi-degree of freedom dynamic vibration absorber of the car body of high-speed trains. Mechanical Sciences, 13(1):239–256, 2021. doi: 10.5194/ms-13-239-2022.
[20] J. Song, P. Si, H. Hua, and Z. Li. A DVA-beam element for dynamic simulation of DVA-beam system: modelling, validation and application. Symmetry, 14(8):1608, 2022. doi: 10.3390/sym14081608.
[21] J.E. Akin. Finite Element Analysis Concepts Via SolidWorks, 1st ed. World Scientific Publishing Co., 2010.
[22] J. Fish and T. Belytschko. A First Course in Finite Elements. Wiley. 2007.
[23] J.P. Hartog, den. Mechanical Vibrations. McGraw-Hill, 1956.
[24] J.B. Hunt. Dynamic Vibration Absorbers, Mechanical Engineering Publications, London, 1979.
[25] B.G. Korenev and L.M. Reznikov. Dynamic Vibration Absorbers. Wiley, 1993.
[26] R.G. Jacquot. Optimal dynamic vibration absorbers for general beam systems. Journal of Sound and Vibration, 60(4):535–542, 1978. doi: 10.1016/S0022-460X(78)80090-X.
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Authors and Affiliations

Faris A. Jabbar
1 2
ORCID: ORCID
Putti Srinivasa Rao
1
ORCID: ORCID

  1. Department of Mechanical Engineering, Andhra University, Visakhapatnam, India
  2. Technical Institute of Al-Dewaniyah, Al-Furat Al-Awsat Technical University (ATU), Al-Dewaniyah, Iraq

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