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1. Random vibrations and energy. Quadratic response estimators
SEA is a method of formulating vibratory exchanges between coupled dynamic systems in the form of a power balance. An historical overview of methodological developments is given in Box 1.
SEA analysis works only on responses to random excitations. Most of the entities introduced into the theory are quadratic operators, from which the rms values of the quantities concerned and their spectral decomposition are deduced.
1.1 Autocorrelation, power spectral density and autospectrum
A random signal x (t), a function of time t, is described to first order by its autocorrelation functionR xx and its amplitude distribution probability density. Random signals...
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Random vibrations and energy. Quadratic response estimators
Response of two coupled oscillators and power transfer
Bibliography
Software tools
GSSEA-Light: Gothenburg Sound AB, Sweden
SEAM, SEAM 3D: Cambridge Collaborative Inc, USA
SEA+, SEAVirt, SEA-TEST, SEA-XP: InterAC, 10 impasse Borde-Basse, ZA La Violette,...
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Standards and norms
- Acoustics – Sound insulation measurement of buildings and building components/Laboratory measurement of airborne sound attenuation by building components. - ISO 140-3 - 1995
- Acoustics – Acoustic insulation measurement of buildings and building components/In situ measurement of airborne sound insulation between rooms. - ISO 140-4 - 1998
- Détermination des niveaux de puissance acoustique émis par les sources...
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