Marine Acoustics, Inc.

Marine Acoustics, Inc. is looking for a highly qualified and motivated #submarineofficer desig 1120 looking for an #opportunity to continue to serve the US Navy 's #underseawarfare domain. If interested please send your #resume to info@marineacoustics.com. #mai #marineacoustics #hiring #career #job #submarine

USS Sterett (DDG-104) will be the first #destroyer to receive all #electronicwarfare, #radar and #combatsystem upgrades under the service’s Destroyer Modernization 2.0 program in a single availability period within the next five years. Compared to the existing quartet of #ArleighBurke-class destroyers slated for modernization, USS Pinckney (DDG-91), USS James E. Williams (DDG-95), USS Chung Hoon (DDG-93) and USS Halsey (DDG-97), which will undergo the project in two availability phases, DDG 2.0 modernization program manager Capt. Timothy Moore told reporters yesterday at the SURFACE NAVAL ASSOCIATION symposium that Sterett will complete its upgrades in one go. “The bottom line here, the real takeaway that I want you to take here, is that we are bridging the gap between our legacy destroyers and the Flight III by delivering decisive combat power to the Flight IIA DDGs,” said Moore. The $17 billion #modernization program aims to bring the fleet’s Flight IIA destroyers up to “Flight III-like capabilities” through the installation of the Northrop Grumman’s AN/SLQ-32(V)7 Surface Electronic Warfare Improvement Program Block III, Raytheon’s AN/SPY-6 air and #missiledefense radar and Lockheed Martin’s Baseline 10 Aegis Weapon System. “These ships, just like the Ticonderoga-class cruisers, were purpose-built around the SPY-1 radar and the #Aegis combat system. And now I am tasked with ripping out that legacy radar and replacing it with the new SPY-6 and upgraded combat system, coupled with other significant midlife upgrades,” Moore stressed to reporters on the nature of his program. #mai #marineacoustics US Navy U.S. Naval Institute #USNI #capability #innovation #forcemultiplier #navy #usnavy https://lnkd.in/eRwvHeRW

This work demonstrates the feasibility of performing through-the-sensor (TTS) sub-bottom imaging using low-frequency ([100 Hz-1kHz]) self-noise generated by the #propulsion of an #autonomousunderwatervehicle (#AUV) acting as a source of opportunity. The self-noise was recorded by a short towed horizontal line array (11.4 m aperture) by the same AUV while it operated ∼35 m above the #seabed along a range-dependent section at the New England shelf break. The seabed and sub-bottom layers imaged by this TTS method were found to be consistent with the images simultaneously obtained at higher #frequency [2.5–4.5 kHz] using a conventional active source mounted on the AUV. karim sabra Paige Pfenninger Ying-Tsong Lin #mai #marineacoustics Massachusetts Institute of Technology MIT Lincoln Laboratory Georgia Institute of Technology Scripps Institution of Oceanography Woods Hole Oceanographic Institution Acoustical Society of America #JASA #sonar #sound #underwateracoustics #innovation #capability #oceanography #geoacoustics #collaboration #oceanscience #marinescience #research #science https://lnkd.in/edYS4wEi

The multi-billion dollar anomaly for #submarines in the current stopgap spending bill isn’t enough to get the boats the US Navy wants under contract, the chief executive officer of the nation’s largest shipbuilder said Thursday. “It’s a step in the right direction,” HII CEO Christopher Kastner told reporters of the $5.6 billion in the current #continuingresolution allotted for the Virginia-class submarines and the #workforce for the #Navy ’s nuclear-powered #ships. “It just doesn’t solve all the challenges.” Kastner said he is currently in talks with the Navy, along with General Dynamics Electric Boat, about the money in the #CR and how to get two Fiscal Year 2024 Block V Virginia-class boats under contract. The current CR, which keeps the #government funded through March 14, includes anomalies to fund the Virginia and Columbia programs. Under a CR, the Pentagon is restricted to spending at the prior fiscal year’s levels and can’t spend money on new start programs. Cost increases for the two FY 2024 boats – Baltimore SSN-812 and Atlanta SSN-813 – are mostly due to an increase in labor costs. US Congress appropriated $9.4 billion for the two boats in Fiscal Year 2024 and the stop-gap bill added an additional $1.95 billion to cover the cost of the two boats. Newport News Shipbuilding, A Division of HII’s, General Dynamics #ElectricBoat and the #USNavy are struggling to ink a deal on 17 planned boats, including the two FY 2024 Virginia-class submarines and multi-year procurement contracts for ten Block VI Virginia-class boats and five Build II Columbia-class ballistic missile submarines. “The most elegant and innovative solution to that is the SAWS approach, which I think we have a bit of a timing issue with the change in administration,” Kastner said. The Shipyard Accountability and Workforce Support proposal, also known as SAWS, is a Navy-crafted plan meant to deal with the rising costs on both the Virginia and Columbia-class boats. SAWS would allow the Navy to pull money forward for boats not yet under contract so Electric Boat and HII’s #NewportNews #Shipbuilding could increase wages for #shipyard workers. It would also let the Navy create a funding pool for employees like crane operators and supervisors working throughout the yard, while wages for trades like pipe fitters and welders could be attached to each hull. #mai #marineacoustics #underseawarfare #capability #capacity #industrialbase #collaboration #innovation #USNI U.S. Naval Institute #industry https://lnkd.in/evZsY6Zk

Commercially available #underwater #acoustic recorders have become commonplace tools in #oceanacoustics #research, due to their ease of #deployment, compact size, and relatively low cost. The size of these systems typically results in a configuration with the #hydrophone in close proximity to the electronics housing, flotation devices, and other equipment that can degrade the generally assumed omnidirectional response of the hydrophone. The mid-frequency acoustic regime (0.5–10 kHz) is particularly affected due to the similarity between the length-scales of these structures and the corresponding acoustic wavelengths. Calibration measurements made at an open-water test facility with a calibrated source/receiver pair characterized the frequency-dependent receiver directivity for three underwater recording devices with different housings and hydrophones: the PVC air-filled Loggerhead Snap, PVC oil-filled SoundTrap ST300, and titanium air-filled SoundTrap ST600. Furthermore, directivity measurements of a TOSSIT mooring [Zitterbart et al., HardwareX (2022)] were taken with the SoundTrap ST300 and SoundTrap ST600. Results suggest the frequency-dependent acoustic directivity of the recorders should not be neglected. In particular, the Loggerhead Snap had variations in receive level of over 20 dB as a function of receive angle and frequency, introducing a bias that obscures spectral levels of the in situ #environment. Robert Taylor Megan Ballard Colby Cushing Kevin Lee Andrew McNeese Preston Wilson Julien Bonnel Daniel Zitterbart #mai #marineacoustics #JASA Acoustical Society of America #sonar #underwateracoustics #science Applied Research Laboratories, The University of Texas at Austin Woods Hole Oceanographic Institution https://lnkd.in/e6EQcW-A

Marine Acoustics, Inc.'s Jacqueline Workman attended the most recent Office of Naval Research (#ONR) Task Force Ocean (#TFO) Tactical #Oceanography Technical Exchange Meeting (TOTEM) at MIT Lincoln Laboratory, additionally she served as a co-chair for the #Intelligence Update. These events continue to strengthen the bonds of all arms of the #Undersea Warfighting Force, increasing capability and capacity through #collaboration. #mai #marineacoustics #underseawarfare #oceanscience US Navy #navy #usnavy #innovation #capability

Marine Acoustics, Inc. is looking for a highly organized #AdministrativeAssistant to support both administrative and accounting functions. This role offers the chance to work closely with our Finance and HR teams while helping manage key tasks like accounts payable/receivable, payroll, and general office duties. Ready to grow with us? Apply today! 🌊 #JobOpening #AdministrativeAssistant #AccountingSupport #MAI #Careers

The 2025 plan to recapitalize the US Navy ’s #fleet will cost about $40.1 billion annually — about double what the service has received from US Congress for #shipbuilding over the last five years, according to the Congressional Budget Office’s annual analysis. Across the scope of the service’s 30-year plan, the #Navy is set to grow from its current battle force of 296 manned #ships to ships to 381 manned vessels plus 134 unmanned surface and #subsurface vehicles by 2045, according to the service’s latest fleet structure review presented to #Congress. Overall, the net addition of 85 ships to the fleet will cost the Navy $1 trillion, according to the #CBO analysis. “The cost of the Navy’s 2025 shipbuilding plan is high not only compared with recent funding but also by historical standards. Over the past decade, funding for #ship construction reached its highest level since the #Reagan Administration’s defense buildup in the 1980s,” reads the report. The last five years have seen an average of $27.5 billion annually for shipbuilding, a significant increase since the fall of the Soviet Union. “Shipbuilding appropriations averaged $32.8 billion (in 2024 dollars) during the #ColdWar years of 1955 to 1989, a period of intense competition between the United States and the Soviet Union,” reads the report. #mai #marineacoustics #capability #capacity #industry #underseawarfare #navalwarfare #usnavy #industrialbase #warfighter #usni U.S. Naval Institute https://lnkd.in/gtFGSQPP

If interested please send your resume to info@marineacoustics.com. #job #career #hiring #opportunity #navy #submarines #underseawarfare https://lnkd.in/gS9GxMBg

The shear wave speed is often small compared to the #compressional wave speed in the top part of the #seabed, where #acoustic normal modes penetrate. In sediments with weak but finite shear rigidity, the strongest conversion from compressional to shear waves occurs at interfaces within the sediment. #Shearwave generation at such interfaces and interference within #sediment layers lead to first-order perturbations in the normal mode phase speed and contributions to sound attenuation, which vary rapidly with frequency. Weak shear rigidity is shown to lead to unexpectedly strong mode group speed perturbations that retain finite magnitudes for very small shear speeds in range-independent waveguides. Variation of the #waveguide parameters with range affects shear-induced attenuation and mode travel time perturbations in a different manner, depending on whether shear wave interference conditions vary appreciably along the propagation path. In horizontally inhomogeneous ocean, weak shear magnifies the horizontal refraction of adiabatic normal modes due to sloping intra-sediment interfaces. In contrast to normal modes, attenuation of lateral waves with range is insensitive to weak shear. Concurrent measurements of normal mode and lateral wave attenuation can be potentially used to identify and separate the contributions of dissipation and shear waves into observed sound attenuation. Oleg A. Godin #mai #marineacoustics Naval Postgraduate School #JASA Acoustical Society of America #acousticmodeling #model #sonar #research #science #marinescience #oceanscience #acoustics #physics #oceanography #underwateracoustics https://lnkd.in/ezBFmdDF