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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Optical Evaluation of Vibrations in a Roof by the LPD Method
Aníbal Valera, Guido Castillo and Kevin Mejía
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DOI:10.17265/1934-7359/2024.11.004
Facultad de Ciencias, Universidad Nacional de Ingeniería, Av. Tupac Amaru, Lima 15333, Perú
In this work, we present the results of the optical evaluation of resonance vibrations in a conventional roof. On this occasion, we took advantage of having an ordinary booth near the laboratory, making it easier for us to conduct this evaluation. The roof in question has a square geometry and is apparently made of concrete. Following our usual LPD (laser photo deflection) procedure, of exciting the vibrations of the structure through sound and detecting the response optically, we obtain by resonance the first 6 roof’s Eigen oscillations, the same ones that are identified as Modes (1,1), (1,2), (2,2), (1,3), (2,3) and (3,3). The occurrence of these modes in this work is justified in a first approximation through the classical acoustic resonator theory.
Structural vibrations, resonance, sound excitation, LPD.
Journal of Civil Engineering and Architecture 18 (2024) 540-544 doi: 10.17265/1934-7359/2024.11.004
[1] Valera, A., Tafur, G., Esenarro, D., and Tafur, V. 2022. “Evaluation of Vibrations in Simple Structures Using the Laser Photo Deflection Method (LPD): Part 2.” In Proceedings of the 5th International Conference on Civil Engineering and Architecture ,ICCEA 2022, December 16-18, 2022, Hanoi, Viet Nam, pp. 461-72.
[2] Valera, A., Melchor, M., and Tafur, V. 2023. “Optical Evaluation of Vibrations in a Concrete Column by the LPD Method.” Journal of Civil Engineering and Architecture 17: 616-20. doi: 10.17265/1934-7359/2023.12.002.
[3] Valera, A., and Ortiz, A. 2007. “Evaluation of Structure Vibrations Using an Optical Non-conventional Method.” Tecnia 17 (2): 47-54.
[4] Kinsler, L. E. 2000. Fundamentals of Acoustics. New York: John Wiley & Sons.