Construcción de una mesa vibratoria y análisis de resultados experimentales obtenidos con visión artificial

Abstract

The objective of this degree work is to determinate and analyze the dynamic properties of Experimental Structural Models (ESM). A shaking table was designed and built to successfully complete the objective. Then, dynamic tests with ESMs of one or two Degree of Freedom (DOF) were executed. The displacement and acceleration records were obtained from the tests through artificial vision (AV) and accelerometers respectively. The working ranges of the shaking table were determined by the precision and accuracy of the movement evaluations at different frequencies and amplitudes. The precision was calculated comparing the displacement registers obtained with the incremental optical encoder in the tests carried out and, the accuracy was evaluated by comparing the experimental registers with the theoretical ones previously proposed. For the application of artificial vision as a displacement measurement method, (Choi et al., 2011) proposes a process for correcting the error produced by the curvature of the camera lens. In this work, the correction procedure was simplified. The precision and accuracy of the artificial vision was determined with the error between the displacement records obtained by this method and those obtained by the incremental optical encoder. Finally, based on the displacement and acceleration records obtained from the free and harmonic vibration tests, the dynamic properties of period, frequency and damping ratio of the ESMs were determined. With these properties, the ESMs were modeled mathematically and their results over time were compared with the experimental ones