Transmission loss of orthogonally stiffened laminated composite plates

Abstract

Sound transmission through laminated composite plates reinforced by two sets of orthogonal stiffeners is investigated theoretically. A layerwise shear deformable theory is used to model the vibration of the laminated composite face-panel; A governing equation of I section composite beam is introduced, which accounts for the extensional, flexural, torsional and their coupling effects. The Euler-Bernoulli beam theory and torsional wave equation are employed to describe the flexural and rotational motions of the rib stiffeners, respectively. The technique of Fourier transform is applied to solve the governing equations resulting in infinite sets of simultaneous algebraic coupled equations, which are numerically solved by truncating them into a finite range insofar as the solutions converge. The accuracy of the numerical solutions is checked by comparing the present model predictions with existing literature. The validated model is subsequently employed to quantify the effects of the spacing of the stiffeners and the stacking geometry of the laminated composite face-panel and stiffeners on sound transmission through the structure. It is demonstrated that both the stiffener spacing and the stacking geometry have significant influences on the sound transmission loss across the structure. The proposed theoretical model successfully characterizes the process of sound penetration through stiffened laminated composite plates, which should be much helpful for the practical design of such structures with acoustic requirements.

Comparative Study of Sound Transmission Losses of Sandwich Composite Double Panel Walls

“…This curve is typically seen as a rising curve and is controlled by the mass law [42]. In some special cases, for flat or rectangular structure, as the stiffness of the material decreases, a damping controlled region could be observed [43,44]. Moreover, the mass-controlled region is also observed by the cylindrical or curved structures but they are within the f r and f cr regime as depicted in Figure 1b.…”

Prediction of acoustic wave transmission features of the multilayered plate constructions: A review

“…Shen et al. [311] theoretically determined the acoustic response of a stiffened plate according to the layerwise shear deformable theory (LSDT). The consequences of this study can be used to inspect the sound characteristics of the stiffened composite plates.…”

Sound transmission loss of sandwich plate with pyramidal truss cores

“…Wang et al [20] applied the model on lightweight double-leaf partitions and compared it by homogenization method. Further, Shen et al [21] investigated the sound penetration through orthogonally stiffened composite plates. The research above was significant.…”

“…Further, Shen et al. [21] investigated the sound penetration through orthogonally stiffened composite plates. The research above was significant.…”