Updating acoustical FE models: localization of unreliable physical data

This paper deals with model updating applied to an interior acoustics problem governed by the Helmholtz equation with generalized boundary conditions. The constitutive relation error (CRE) method is used to update the impedance and velocities of the boundaries which can be vibrating and absorbing at the same time. The strategy consists first in building local error indicators to detect potential errors on the measurements, then local error indicators in order to choose iteratively which part of the boundary should be corrected, until an error threshold is reached. The proposed methodology is illustrated on a simple 2D example of a car cabin for which the measurements are produced using a modified model. While the results are promising, further studies are needed in order to apply the method to a real problem.