## 1 Introduction  
This paper presents a summary of some common research works carried out by the authors concerning computational methods for the prediction of the responses in the frequency domain of general linear dissipative vibroacoustics (structural-acoustic) systems for liquid and gas in the low- frequency (LF) and medium-frequency (MF) domains, including uncertainty quantification (UQ) that plays an important role in the MF domain. The contribution of this paper is the presentation of an efficient computational methodology adapted to large-scale computational vibroacoustic models which corresponds to a combination of established methods, and an application of this computational methodology is presented for an industrial vibroacoustic system. Considering all the aspects that are developed in this paper in order to present a complete strategy for the modeling and computational approaches--external acoustic fluid modeling, internal acoustic fluid including a dissipation term and frequency-dependent wall impedance, structure with frequency-dependent constitutive equation, reduced-order model for weak and strong coupling between the structure and the internal acoustic fluid, complete methodology for uncertainty quantification--a synthetic presentation has been adopted for readability, and we refer the reader to the given appropriate bibliography for the details. Nevertheless, since the model uncertainties induced by the modeling errors--which cannot be taken into account by using the usual probabilistic parametric approach of uncertain parameters or of other deterministic approaches of uncertainties--is relatively novel for the readers who are not familiarized with such a formulation, this part is more detailed in terms of equations. More specifically, this paper is devoted to computational methods for the prediction of the frequency responses of linear dissipative vibroacoustic (structural-acoustic) systems in the low- and medium-frequency ranges. The vibroacoustic system consists of a deformable dissipative structure, coupled with a bounded internal dissipative acoustic fluid including a wall acoustic impedance, immersed in an unbounded acoustic fluid, and submitted to internal and external acoustic sources, as well as mechanical forces. Computational vibroacoustic predictions play an important and increasing role in analyzing industrial complex systems, and many works have been published in this field. The physics on which the computational vibroacoustics formulations are based can be found in numerous books, such as in [1; 2; 3; 4; 5; 6; 7; 8; 9; 10; 11]. For the spatial discretization of structures and bounded internal acoustic fluids, the computational vibroacoustics are generally based on the finite element method (FEM) (see for instance [12; 13; 14; 15], and [16] for the corresponding isogeometric formulation). For the spatial discretization of the unbounded external acoustic fluid, either finite element method or boundary element method (BEM) are used. Concerning the use of the local discretization of the unbounded external acoustic fluid, we refer the reader to [17; 18; 19; 20; 21; 22; 23; 24; 25; 26], and for the BEM that is based on the finite element discretization of the boundary integral equation methods, let us cite [27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37]. Concerning the BEMs that are specifically devoted to the unbounded external acoustic fluid, we refer the reader to [38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48]. Reduced-order models (ROMs) are very attractive and efficient for analyzing large computational vibroacoustics models that have a significant number of design parameters--also called parametric high-dimensional computational models (HDMs)--for design and optimization, for constructing online models for active control, and for taking uncertainties into account.