Noise control strategies using composite porous materials – Simulations and experimental validations on plate/cavity systems

2011 ◽  
Vol 59 (5) ◽  
pp. 464 ◽  
Author(s):  
François-Xavier Bécot ◽  
Luc Jaouen ◽  
Franck Sgard
Keyword(s):  
Porous Materials ◽  
Noise Control ◽  
Control Strategies ◽  
Experimental Validations

Plumbing noise control strategies in wood structures.

2011 ◽  
Vol 129 (4) ◽  
pp. 2604-2604
Author(s):  
John LoVerde ◽  
Wayland Dong
Keyword(s):  
Noise Control ◽  
Control Strategies ◽  
Wood Structures

Rotor noise control using 3D-printed porous materials

2017 ◽  
Vol 142 (4) ◽  
pp. 2507-2507 ◽  
Author(s):  
Con Doolan ◽  
Chaoyang Jiang ◽  
Danielle Moreau ◽  
Yendrew Yauwenas
Keyword(s):  
Porous Materials ◽  
Noise Control ◽  
Rotor Noise ◽  
3D Printed

Optimization of 3D printed porous materials accounting for manufacturing defects

2021 ◽  
Vol 263 (3) ◽  
pp. 3143-3148
Author(s):  
Jean Boulvert ◽  
Théo Cavalieri ◽  
Vicente Romero-García ◽  
Gwénaël Gabard ◽  
Jean-Philippe Groby
Keyword(s):  
Additive Manufacturing ◽  
Porous Materials ◽  
Numerical Models ◽  
Manufacturing Processes ◽  
Perfect Absorption ◽  
Manufacturing Defects ◽  
Low Weight ◽  
Minimization Algorithms ◽  
3D Printed ◽  
Experimental Validations

Open-cell materials are well-known for their low price, low weight, and broadband acoustic behavior. They form one of the most used class of acoustic treatments but suffer from a lack of versatility when made by conventional manufacturing processes. Recent advances in additive manufacturing allow to produce porous materials having a controlled microstructure. In this way, the design of treatments including porous materials is not limited to a catalog of existing media. The macroscopic behavior is governed by the micro-geometry of the porous medium, which can be estimated by numerical models. Then, acoustic treatments can be optimized numerically using predicting models and minimization algorithms. However, additive manufacturing induces defects often too complex to be accounted for numerically. In this presentation, a method allowing to obtain the parametric model of the intrinsic behavior of a 3D-printed porous material is presented. The corrected model is used in the optimization of several porous treatments; namely, graded porous materials, folded porous materials and metaporous surfaces. These treatments are versatile and display remarkable properties. They provide quasi-perfect absorption at several frequencies that can be out of reach of standard porous treatments in normal or oblique incidence. Experimental validations confirm the relevance of the proposed design processes.

Recent progress in acoustic materials and noise control strategies – A review

2021 ◽  
Vol 24 ◽  
pp. 101141
Author(s):  
Yinping Tao ◽  
Musu Ren ◽  
Han Zhang ◽  
Ton Peijs
Keyword(s):  
Recent Progress ◽  
Noise Control ◽  
Control Strategies

scholarly journals Passive Noise Control Strategies for Jets Exhausting over Flat Surfaces: an LES Study

2020 ◽  
Author(s):  
Colby Horner ◽  
Adrian Sescu ◽  
Mohammed Z. Afsar ◽  
Eric Collins ◽  
Mahdi Azarpeyvand
Keyword(s):  
Noise Control ◽  
Control Strategies ◽  
Flat Surfaces ◽  
Passive Noise

Noise reduction performance of a low energy façade-integrated mechanical ventilator

2020 ◽  
pp. 1351010X2096618
Author(s):  
Marco A Oliveira ◽  
Luis Bragança ◽  
Sandra M Silva ◽  
Dinara Paixão ◽  
Julieta António
Keyword(s):  
Energy Consumption ◽  
Noise Reduction ◽  
Energy Demand ◽  
Noise Control ◽  
Control Strategies ◽  
Minimum Energy ◽  
Sound Insulation ◽  
Mechanical Ventilator ◽  
Noise Emission ◽  
Acoustic Comfort

Acoustic comfort and indoor air quality are essential for the health and wellbeing of the occupants of the building. Thus, the façade must guarantee enough sound insulation and ventilation conditions. However, these aspects conflict because opening windows or using ventilation openings reduces the sound insulation of the envelope and allows the exterior noise entrance. To limit noise transmission into the building, ventilators use passive, active or hybrid noise control techniques. This work addresses the noise reduction performance of a mechanical ventilator for façades, evaluating the effect of different options of passive noise control strategies in the sound insulation of the proposed ventilator. In addition, the air change rate and energy consumption of the ventilator were also investigated. Three prototypes were fabricated and tested at an acoustic chamber, along with ventilation tests carried out in a room equipped with a blower door. CFD simulations were used to enhance the aeraulic geometry of the prototypes, prior to its fabrication. The acoustic experiments showed Dn,e,w values up to 55 dB and noise emission levels lower than 25 dB(A). The use of resistive sound absorbers proved to be more effective in mitigating noise than reactive absorbers, over the entire frequency range. The ventilation tests revealed air change rates of 3.7 h−1 at 50 Pa, while the ventilator’s annual energy consumption was 17.52 kWh. The results highlight the proposed device as a viable alternative for decentralised mechanical ventilation, capable of ensuring noise protection and satisfactory ventilation rates, under a sustainable perspective of minimum energy demand.

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