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Sandwich and composite panels are widely used in acoustic applications due to their sound insulation properties that overrule mass-based partitions in medium-u2013high frequency regions. The control of the resonance-dominated region of the sound transmission loss curve is a crucial component of acoustic panels' design process. Such devices typically exhibit acoustic insensitivity and poor insulation results within a narrow frequency range when compared to standard single-layer systems. We want to introduce an innovative twist to the sandwich partition theory in this contribution. By adopting a regular repetition of a properly planned unit cell, a novel single-phase sandwich panel can be achieved. A series of parametric studies has been published to demonstrate how the unit cell's topology influences the panel's noise reduction capabilities. Industrial and production considerations are also considered during the manufacturing process to ensure the solution is industrially viable with a circular economy emphasis.
Source link: https://doi.org/10.3389/fmats.2022.1005615
This paper examines vibroacoustic requirements in the context of hotel building impact and airborne sound insulation. The measurement of representative partitions was determined by researchers who determined whether the requirements of the new polish standard PN-B-02151-03:2015 for hotel buildings were fulfilled, according to the author. Considering the fact that timber structural ceiling and a reinforced concrete floor are included in hotel building calculations of impact sound level and airborne sound insulation are fulfilled. According to the manufacturer, a wall pre-wall with mineral wool inside is the most effective way to solve poor acoustic conditions.
Source link: https://doi.org/10.21595/jme.2019.20448
Some improvements on the traditional single-layer beamforming microphone array have been made to reduce the influence of interference acoustic source on the array's source identification results, as well as some improvements on the traditional single-layer microphone array's ability. Simulation and verification results reveal that, with the presence of the interference acoustic source in the rear of a conventional planar array, the acoustic source position and amplitude deviations are much higher, indicating that the interference acoustic source substantially affects the identification of the target acoustic source.
Source link: https://doi.org/10.21595/jve.2016.17195
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