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An analytical model for broadband sound transmission loss of a Finite Single Leaf Wall using a two degree of freedom resonant Metamaterial
Javier Hernan Vazquez,Jonas Brunskog,Vicente Cutanda Henriquez +2 more
- pp 2091-2098
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TLDR
In this article, the authors investigated the possibility of using AMs for increasing the sound insulation of finite single leaf walls (SLW), focusing on the coincidence effect problem, and derived formulas using a variational technique for the forced sound transmission of finite SLW with a coupled array of two degree of freedom resonators.Abstract:
Acoustic metamaterials (AM) have emerged as an academic discipline within the last decade. Metamaterials can exhibit high transmission loss at low frequencies despite having low mass per unit area. This paper investigates the possibility of using AMs for increasing the sound insulation of finite single leaf walls (SLW), focusing on the coincidence effect problem. Formulas are derived using a variational technique for the forced sound transmission of finite SLW with a coupled array of two degree of freedom resonators. An analytical model is presented and the effects of the band gap in sound transmission and radiation are analyzed and compared to the single degree of freedom case. Moreover, numerical simulations verify the two degree of freedom model. Finally, some conclusions are drawn regarding the effectiveness of the proposed model, possible applications, and future work.read more
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An Analytical Model for Broadband Sound Transmission Loss of a Finite Single Leaf Wall using a Metamaterial
TL;DR: In this article, the authors investigated the possibility of using AMs to increase the sound insulation of finite single leaf walls (SLWs), focusing on the coincidence effect problem, and derived formulas using a variational technique for the forced sound transmission of finite SLWs with a coupled array of single degree of freedom resonators.
References
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TL;DR: In this paper, the authors describe the human ear's physical properties of the central partition of the Central Partition of Noise Induced Hearing Loss Subjective Response to Sound Pressure Level Instrumentation for Noise Measurement and Analysis Microphones Weighting Networks Sound Level Meters Classes of Sound Level Meter Sound Level meter Calibration Noise Measurements Using Sound Level Measurement Data Loggers Personal Sound Exposure Meter Recording of Noise Spectrum Analysers Intensity Meter Energy Density Sensors Sound Source Localization Criteria Introduction Hearing Loss Hearing Damage Risk Hearing Damage risk Criteria Implementing a Hearing Conservation
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The effects of environmental and classroom noise on the academic attainments of primary school children
Bridget Shield,Julie E. Dockrell +1 more
TL;DR: External noise was found to have a significant negative impact upon performance, the effect being greater for the older children, and Linear regression analysis has been used to estimate the maximum levels of external and internal noise which allow the schools surveyed to achieve required standards of literacy and numeracy.
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Ultra-thin metamaterial for perfect and quasi-omnidirectional sound absorption
TL;DR: Using the concepts of slow sound and critical coupling, an ultra-thin acoustic metamaterial panel for perfect and quasi-omnidirectional absorption is theoretically and experimentally conceived in this paper.
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On the potential of tuned resonators to obtain low-frequency vibrational stop bands in periodic panels
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Effects on performance and work quality due to low frequency ventilation noise
TL;DR: In this article, a pilot study was carried out to assess method evaluating effects of low frequency noise on performance, and subjective and objective effects over time were studied over a period of three weeks.