Acentech - Marine Noise Mitigation Brochure

Marine Noise MITIGATION SERVICES

Acentech helps busy shipping ports measure, understand and control noise levels.

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Noise Mitigation Shipyards, Ports and Vessels Acentech is a multi-disciplinary acoustics and vibration consulting firm. We are one of the oldest and largest organizations of its type with roots stretching back more than 70 years. We are an unequaled partners to governments, institutions, engineers, manufacturers, and architects worldwide.

Our consultants are leading industry experts in environmental noise mitigation consulting: from predicting the noise and vibration impact of shipping and other transportation systems, to drafting and interpreting community noise ordinances.

Acentech’s marine noise expertise includes vessel noise mitigation (quiet ship design) for U.S and Canadian government agencies, research, industrial and transportation vessels.

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Marine Acoustics

Acentech provides a range of acoustics and noise control support for shipyards, ports and communities that might be impacted by unwanted noise.

• Airborne Noise Analysis, Testing, and Mitigation • Community Noise Review, Specification and Development • Expert Witness • Litigation Consulting • Marine Equipment and Machinery Assessment and Testing • Noise and Vibration: Remote Monitoring, Analysis and Mitigation • Quiet Ship Design and Construction Review • Shipboard Sea Trials Testing • Underwater Noise Compliance Analyses • Vibration Analysis and Mitigation

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MV Grey Lady Noise Evaluation, aerial base map

MV Edward V. Kramer Noise Evaluation 5

Noise Control Case Studies M/V Grey Lady IV Hy-Line Cruises, Hyannis, MA Acentech conducted a noise compliance study in 2020 for the M/V Grey Lady IV, a high-speed passenger catamaran that runs from Hyannis to Nantucket. Hy-Line Cruises had received several complaints about excessive noise from a resident close to Nantucket Island’s passenger terminal dock. Our study consisted of an on-board diagnostic survey, sound measurements on land, and a review of municipal noise ordinances for both Barnstable and Nantucket counties.

During our noise compliance assessment, we measured sound from a nearby residential location. We performed a noise mitigation study using Cadna/A acoustic modeling software, which complies with international standard ISO 9613-2. Our final report generated several noise treatment options including an exhaust deflector, engine configuration options, ship muffler replacement, and dock placement.

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Quieting Ships to Protect the Marine Environment Transport Canada Technical Workshop, London, UK In January 2019, Transport Canada hosted a technical workshop entitled “Quieting Ships to Protect the Marine Environment” at the International Maritime Organization (IMO) Headquarters in London, UK. Around 140 subject-matter experts from around the world gathered at this event for two and half days.

The purpose of the workshop was to identify the state of knowledge on quiet ship design, provide an opportunity for international collaboration, and exchange research ideas. Elevated anthropogenic underwater noise in the oceans has been a known issue since the early part of the 21st century, and marine biology researchers have determined that the increase in underwater-radiated noise has multiple negative impacts on various species of marine life.

The technical program consisted of nine focused presentations addressing topics such as the impact of underwater noise on marine life, challenges in setting underwater noise limits, marine industry activities in controlling undersea sound from shipping, engineering of noise control treatments, and methods of ship noise prediction from hull and propeller.

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Experience & Publications

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U.S. Navy Submarine School Submarine Escape Trainer Acoustics, Noise & Vibration Control New London, CT U.S. Navy R&D Underwater Helmet Noise Reduction U.S. Navy R&D Aircrew/Pilot Helmet Noise Reduction

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Hy-Line Cruises MV Grey Lady Exhaust Study Noise Control Hyannis, MA

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Fairhaven Shipyard MV Edward V. Kramer Noise Control Fairhaven, MA

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Woods Hole Oceanographic Institution Sensitive Compartmented Information Facility (SCIF) Acoustics Consulting Woods Hole, MA M/S Grand Manan Adventure* Government of New Brunswick Noise Control New Brunswick, Canada R/V Western Flyer* Monterey Bay Aquarium Research Institute Noise Control Monterey, CA

* completed by Michael Bahtiarian prior to joining Acentech 8

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Quieting Ships to Protect the Marine Environment, Transport Canada/Government of Canada Symposium Report, 2019

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Marine Vessel Environmental Performance Assessment Guide, Society of Naval Architects and Marine Engineers (SNAME), T&R 6-2 MVEP GM-1, May 12, 2014*

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Design of the Research Vessel Hugh R. Sharp, (with David Bonney, Bay Marine) Sea Technology, June 2007*

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Underwater Radiated Noise of the NOAA Vessel OSCAR DYSON, (with Raymond Fischer) Noise Control Engineering Journal, 54(4), July-August, 2006*

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Measurement of Underwater Noise of the New NOAA Ship OSCAR DYSON, Proceedings of the 2005 Institute of Noise Control Engineering (INCE) Annual Meeting,NoiseCon, October 2005*

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Underwater Noise: Not Just the Military’s Problem, Marine Technology Reporter July-August 2005 & Maritime Reporter and Engineering News (shorter version of same article), September 2005*

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Building a Quiet Vessel without a Navy Budget, Two Part Article, Marine News, January & February 2002*

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The Precise Acoustic Design of a Pilot Station Boat, Proceedings of the 2001 Institute of Noise Control Engineering (INCE) Annual Meeting, NoiseCon, October 2001*

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Diagnosing and Curing Global Ship Resonances, Proceedings of the 2000 Institute of Environmental Science and Technology (IEST) Annual Technical Meeting, May 2000*

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Simpler Torsional Shafting Tests for USCG Coastal Patrol Boat, Proceedings of the 1998 Annual Workboat Show, December 1998*

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Silent Treatments, Steps for Quieting Workboats, Workboat Magazine, October 1998*

Meet the Experts Michael Bahtiarian, INCE Bd Cert

Principal Consultant | Acoustics, Noise & Vibration mbahtiarian@acentech.com Michael Bahtiarian has over 25 years of acoustical, noise and vibration mitigation consulting experience, and has managed numerous shipboard noise reduction programs including shipboard noise and vibration test and measurement projects.

These include shipboard sea trials on U.S. Navy research vessels, U.S. Coast Guard cutters and patrol boats, passenger and ro-ro ferries and various workboats. He has performed noise predictions on various types of vessels using methods from SNAME “Design Guide for Airborne Noise Control” and other software.

Mr. Bahtiarian is the current president of the Institute of Noise Control Engineering (INCE-USA), and has authored dozens of papers and reports on the mitigation of ship noise, including: Marine Vessel Environmental Performance Assessment Guide, Society of Naval Architects and Marine Engineers (SNAME), T&R 6-2 MVEP GM-1, May 12, 2014; Towards Quieter Seas, American Society of Mechanical Engineers (ASME) Magazine, June 2013; and Quieting Ships to Protect the Marine Environment, Transport Canada/Government of Canada Symposium Report, 2019.

Ethan Brush

Principal Consultant | Noise + Vibration ebrush@acentech.com Drawing from his background in vibration data acquisition and analysis, Ethan Brush has over 15 years of consulting experience, with a focus on structural dynamics.

After beginning his career at Raytheon, he later joined Acentech where his expertise includes dynamic testing and analysis for aerospace and defense applications, as well as vibration mitigation studies at university research laboratories.

At Acentech, Ethan focuses on analysis and design of vibration mitigation systems for sensitive building spaces, as well as real-time remote monitoring for construction-related noise and vibrations. He applies his sound and vibration testing expertise to environmental noise projects in the transportation and energy industries.

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ACOUSTICS

TECHNOLOGY

VIBRATION

for more info contact info@acentech.com 617 499 8000

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