Uncertainties in acoustical transfer functions : modeling, measurement and derivation of parameters for airborne and structure-borne sound

摘要

Measured transfer functions of acoustic systems are often used to derive single-number parameters. The uncertainty analysis is commonly focused on the derived parameters but not on the transfer function as the primary quantity. This thesis presents an approach to assess the uncertainty contri- butions in these transfer functions by using analytic models. Uncertainties caused by the measurement method are analyzed with a focus on the un- derlying signal processing. In particular, the influence of nonlinearities in the acoustic measurement chain are modeled to predict artifacts in the measu- red signals and hence the calculated acoustic transfer function. Secondly, characterization methods commonly applied in the field of signal processing are linked to the acoustic scenarios and the main influencing parameters. Acoustic parameters are then derived analytically and by means of Monte Carlo simulations considering the uncertainty of these input parameters. In order to provide airborne applications, analytic models for sound barrier and room acoustic measurements are developed incorporating the direc- tivity and the orientation of the sound source as well as the positions of sources and receivers. The simulated uncertainty contributions are valida- ted by measurements. The same approach is also applied to structure-borne sound applications.