Noise mitigation systems (NMS) for reducing pile driving noise: Experiences with the “big bubble curtain” relating to noise reduction

2013 ◽  
Vol 134 (5) ◽  
pp. 4059-4059 ◽  
Author(s):  
Michael A. Bellmann ◽  
Patrick Remmers
Keyword(s):  
Noise Reduction ◽  
Pile Driving ◽  
Noise Mitigation ◽  
Big Bubble ◽  
Bubble Curtain

scholarly journals Study of the Sound Escape with the Use of an Air Bubble Curtain in Offshore Pile Driving

2021 ◽  
Vol 9 (2) ◽  
pp. 232
Author(s):  
Yaxi Peng ◽  
Apostolos Tsouvalas ◽  
Tasos Stampoultzoglou ◽  
Andrei Metrikine
Keyword(s):  
Noise Reduction ◽  
Wave Field ◽  
Ecological Impact ◽  
Free Field ◽  
Pile Driving ◽  
Noise Prediction ◽  
Underwater Noise ◽  
Air Bubble ◽  
Noise Transmission ◽  
Bubble Curtain

Underwater noise pollution generated by offshore pile driving has raised serious concerns over the ecological impact on marine life. To comply with the strict governmental regulations on the threshold levels of underwater noise, bubble curtains are usually applied in practice. This paper examines the effectiveness of an air bubble curtain system in noise reduction for offshore pile driving. The focus is placed on the evaluation of noise transmission paths, which are essential for the effective blockage of sound propagation. A coupled two-step approach for the prediction of underwater noise is adopted, which allows us to treat the waterborne and soilborne noise transmission paths separately. The complete model consists of two modules: a noise prediction module for offshore pile driving aiming at the generation and propagation of the wave field and a noise reduction module for predicting the transmission loss in passing through an air bubble curtain. With the proposed model, underwater noise prognosis is examined in the following cases: (i) free-field noise prediction without the air bubble curtain, (ii) waterborne path fully blocked at the position of the air bubble curtain while the rest of the wave field is propagated at the target distance, (iii) similarly to (ii) but with a non-fully blocked waterborne path close to the seabed, and (iv) air bubble curtain modeled explicitly using an effective medium theory. The results provide a clear indication of the amount of energy that can be channeled through the seabed and through possible gaps in the water column adjacent to the seabed. The model allows for a large number of simulations and for a thorough parametric study of the noise escape when a bubble curtain is applied offshore.

scholarly journals Wind creates a natural bubble curtain mitigating porpoise avoidance during offshore pile driving

2016 ◽  
Author(s):  
Anne-Cécile Dragon ◽  
Miriam J. Brandt ◽  
Ansgar Diederichs ◽  
Georg Nehls
Keyword(s):  
Pile Driving ◽  
Bubble Curtain

Noise reduction of pile driving and unexploded ordinance detonations at offshore wind farm installation sites

2017 ◽  
Vol 141 (5) ◽  
pp. 3847-3847
Author(s):  
Mark S. Wochner ◽  
Kevin M. Lee ◽  
Andrew R. McNeese ◽  
Preston S. Wilson
Keyword(s):  
Noise Reduction ◽  
Wind Farm ◽  
Offshore Wind ◽  
Pile Driving ◽  
Offshore Wind Farm ◽  
Unexploded Ordinance

scholarly journals Role of Polymeric Coating on Metallic Foams to Control the Aeroacoustic Noise Reduction of Airfoils with Permeable Trailing Edges

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1087 ◽  
Author(s):  
Reza Hedayati ◽  
Alejandro Rubio Carpio ◽  
Salil Luesutthiviboon ◽  
Daniele Ragni ◽  
Francesco Avallone ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Metal Foams ◽  
Polymeric Coating ◽  
Metallic Foams ◽  
Noise Mitigation ◽  
Trailing Edge ◽  
Reference Case ◽  
Pore Sizes ◽  
Coated Metal ◽  
Trailing Edges

Studies on porous trailing edges, manufactured with open-cell Ni-Cr-Al foams with sub-millimeter pore sizes, have shown encouraging results for the mitigation of turbulent boundary-layer trailing-edge noise. However, the achieved noise mitigation is typically dependent upon the pore geometry, which is fixed after manufacturing. In this study, a step to control the aeroacoustics effect of such porous trailing edges is taken, by applying a polymeric coating onto the internal foam structure. Using this method, the internal topology of the foam is maintained, but its permeability is significantly affected. This study opens a new possibility of aeroacoustic control, since the polymeric coatings are temperature responsive, and their thickness can be controlled inside the foam. Porous metallic foams with pore sizes of 580, 800, and 1200 μm are (internally) spray-coated with an elastomeric coating. The uncoated and coated foams are characterized in terms of reduced porosity, average coating thickness and air-flow resistance. Subsequently, the coated and uncoated foams are employed to construct tapered inserts installed at the trailing edge of an NACA 0018 airfoil. The noise mitigation performances of the coated metal foams are compared to those of uncoated metal foams with either similar pore size or permeability value, and both are compared to the solid trailing edge reference case. Results show that that the permeability of the foam can be easily altered by the application of an internal coating on the metallic foams. The noise reduction characteristics of the coated foams are similar to equivalent ones with metallic materials, provided that the coating material is rigid enough not to plastically deform under flow conditions.

Noise mitigation with balloon arrays during pile driving activities in the underwater environment

2015 ◽  
Author(s):  
Yu-Hang Wu ◽  
Tien-Siang Ling ◽  
Wei-Shien Hwang ◽  
Chi-Fang Chen
Keyword(s):  
Pile Driving ◽  
Noise Mitigation ◽  
Underwater Environment

scholarly journals Exploiting ground effects for surface transport noise abatement

Noise Mapping ◽  
2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Keith Attenborough ◽  
Imran Bashir ◽  
Shahram Taherzadeh
Keyword(s):  
Noise Reduction ◽  
Traffic Noise ◽  
Square Lattice ◽  
Artificial Roughness ◽  
Noise Mitigation ◽  
Noise Abatement ◽  
Surface Transport ◽  
Lattice Design ◽  
Parallel Wall ◽  
Ground Effects

AbstractGrowing demand on transportation, road and railway networks has increased the risk of annoyance from these sources and the need to optimise noise mitigation. The potential traffic noise reduction arising from use of acoustically-soft surfaces and artificial roughness (0.3 m high or less) is explored through laboratory experiments, outdoor measurements at short and medium ranges and predictions. Although the applicability of ground treatments depends on the space usable for the noise abatement and the receiver position, replacing acousticallyhard ground by acoustically-soft ground without or with crops and introducing artificial roughness configurations could achieve noise reduction along surface transport corridors without breaking line of sight between source and receiver, thereby proving useful alternatives to noise barriers. A particularly successful roughness design has the form of a square lattice which is found to offer a similar insertion loss to regularly-spaced parallel wall arrays of the same height but twice the width. The lattice design has less dependence on azimuthal source-receiver angle than parallel wall configurations.

Modeling the noise mitigation of a bubble curtain

2019 ◽  
Vol 146 (4) ◽  
pp. 2212-2223 ◽  
Author(s):  
Tobias Bohne ◽  
Tanja Grießmann ◽  
Raimund Rolfes
Keyword(s):  
Noise Mitigation ◽  
Bubble Curtain
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