Isogeometric analysis for geometric modelling and acoustic attenuation performances of reactive mufflers

Enhanced Acoustic Attenuation Performance of a Novel Absorptive Muffler: A Helmholtz Equation-Based Simulation Study

“…Similarly, Lee et al [21], by governing the gradient-based optimization, carried out an investigation on mufflers and their acoustic issues under different conditions, such as noise frequency and unpredictable temperature, and consequently proposed the result of their experimental investigation according to the performance of acoustic attenuation. Xue et al [22] derived the multi-patch technique to analyze interior acoustic pressure in the framework of the Galerkin formulation of circular, elliptical, and reaction expansion chamber mufflers. In addition, with the aid of the FEM method and non-uniform rational B-splines, they obtained the Helmholtz equation.…”

Design and demonstration of composite mufflers based on dissipative and reactive units

“…As the most common component of mufflers, porous sound absorbing materials (PSAM) can achieve efficient noise reduction in the middle and high-frequency range, as they can fully convert the sound energy entering the micropores into thermal energy for energy consumption [2,3]. Expansion cavity muffler, as a familiar silencer structure, introduces a mismatch in acoustic impedance due to variable cross-sectional area, thereby causing efficient reflection of sound wave for sound insulation [4,5]. However, these traditional mufflers cannot give satisfactory results in the low-frequency band without large volumes and bulky materials.…”

An isogeometric boundary element method for heat transfer problems of multiscale structures in electronic packaging with arbitrary heat sources

“…Based on the IGA and scaled boundary element method Zang et al [14] developed a numerical scheme to solve the static bending and free vibration problems of functionally graded material plates. Actually, IGA has attracted a large research community and been successfully applied in elasticity problems [15][16][17], electromagnetics [18][19][20], fluids problems [21,22], accoustic problems [23,24], wave problems [25], contact problems [26], vibration analysis [27][28][29], cracks [30][31][32][33][34], optimization problems [35][36][37], material uncertainty [38], thermal buckling [39], poroelastic material [40], etc. Since the initial IGA was based on NURBS [6] which contains a tensor product form, the uniform NURBS-based refinement scheme is difficult to capture local features of interest.…”