Structural-acoustic optimization of sandwich structures with cellular cores for minimum sound radiation

Reduction of the sound transmission of a periodic sandwich plate using the stop band concept

“…This improvement is caused by the increase of the surface mass, and the effect of the resonator can be considered as the added average mass to the plate. 16 This effect of the increased mass is verified by the similarity of the STL curves for the periodic plate and the bare plate II. However, as the frequency increases, that is, in range II', although the mass of the periodic plate and bare plate II are larger than the mass of bare plate I, the STL values of all of these plates are at the same level.…”

“…Some work has also been performed to improve the vibro-acoustic performance of sandwich structures. Sun et al [16], Ruzzene et al [17] and Steven et al [18] performed optimization studies. There are many research studies on suppressing the 3 vibration and noise of a homogeneous plate or other structures [19][20][21][22][23][24][25][26], which also provide a useful reference.…”

Characteristic amplitude-frequency functions of the radiated sound power

“…Thus, the vibro-acoustic design of composite structures is a complex optimisation process with numerous design parameters. 6,16 Therein, the modal damping can be modelled with an energetic approximation of anisotropy. 19,24 The simulation-based design of dynamically loaded and acoustically sensitive components essentially includes the determination of the sound power as a common measure of the structure borne sound.…”

Optimization of 3D lattice cores in composite sandwich structures

“…The combination of polymer foam and reinforcing struts increases the compressive and shear strengths of the core material and has a symbiotic effect because the polymer foam reduces the propensity of the slender struts to buckle. The added complexity of both the pin-reinforced and lattice cores offers greater design freedom that can be used to tailor the cores for acoustic performance, 10 impact resistance, 11 active cooling, 12 thermal insulation, 13 or fatigue mitigation. 14 Before addressing issues of multifunctionality, a fundamental question is the optimal design for pin-reinforced or lattice cores which has the minimum mass for a required strength.…”