TJ Mechanical engineering and machinery 25 Reinforced concrete 7 Vibration analysis 7 system identification 7 Finite element method 5 Flexible structures 4 Mean square error 4 Mechanics applied to machinery. Dynamics 4 Vibrations (mechanical) 4 X-ray diffraction 4 particle swarm optimization 4 Active vibration controls 3 Ambient vibrations 3 Article 3 Buildings 3 Concrete buildings 3 Damage detection 3 Data acquisition 3 Dynamic loading conditions. Structural dynamics. Vibrations 3 Earthquake engineering 3 Empirical model 3 Fiber optic sensors 3 Flexible plate structures 3 Fourier amplitude spectra 3 Fourier transform infrared spectroscopy 3 Nanoparticles 3 Natural frequencies 3 Plates (structural components) 3 Psychophysical experiments 3 Raman spectroscopy 3