Every vessel that moves through water generates noise. Engines fire, propellers cavitate, waves slap the hull, generators hum, shaft systems vibrate, and onboard machinery runs continuously — often at ear-splitting levels. For naval crews on extended deployments, passengers aboard commercial ships, guests on luxury yachts, and workers in offshore vessels, the relentless presence of this noise is not merely uncomfortable. It is operationally degrading, physiologically harmful, and in defence applications, a genuine tactical liability.
AquaSonic™ Internal Hull Sound Damping Panels by Packsound are high-performance, multi-layer composite acoustic panels engineered specifically for the demands of the marine environment. Built to reduce both structure-borne and airborne noise within vessels of every category — from naval submarines and warships to commercial cargo vessels, passenger ferries, offshore platforms, and luxury yachts — AquaSonic™ Hull Damping Panels deliver measurable, lasting noise reduction where standard acoustic materials cannot survive.
Proudly designed and manufactured in India using advanced indigenous acoustic technology, AquaSonic™ Hull Sound Damping Panels bring world-class marine acoustic performance to Indian naval, commercial, and recreational vessel projects — with full customisation capability and domestic supply chain advantages.
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Why Marine Vessels Are Among the Most Acoustically Challenging Environments on Earth
A vessel at sea is a uniquely hostile environment for both human comfort and acoustic management. Unlike a building — where noise sources are fixed, predictable, and often manageable at source — a vessel concentrates multiple powerful, continuous noise generators within a rigid steel or aluminium shell that acts as a highly efficient vibration conductor.
Understanding the distinct noise sources aboard a vessel is the starting point for any effective acoustic treatment strategy.
Structure-Borne Noise: Vibration Through the Hull
Structure-borne noise is generated when mechanical energy from rotating or reciprocating machinery — engines, propellers, shafts, generators, pumps — is transmitted directly into the vessel’s structure as vibration. Once in the hull, these vibrations propagate efficiently through the steel or aluminium plating and framework, radiating as audible noise wherever the structure is in contact with air-filled spaces.
The hull itself can become a resonating surface — particularly thin aluminium plates in high-speed craft — amplifying specific frequencies and radiating them across large areas of the vessel interior. Hull slap from wave impact creates broadband impulsive noise that peaks above 90 dB(A) in aluminium-hulled vessels and travels rapidly through the structure.
Structure-borne noise cannot be addressed by lining surfaces with soft, porous absorbers alone. It requires vibration damping — applying constrained or free-layer damping compounds that convert the mechanical vibration energy into heat through internal friction in the damping layer, before it can be radiated as airborne sound.
Airborne Noise: Direct Sound Transmission
Airborne noise is generated directly by machinery and transmitted through the air inside the vessel. Engine combustion noise, exhaust system resonance, gearbox whine, fan and blower noise, and generator set firing pulses all contribute to the airborne noise environment — particularly in and around the engine room.
Airborne noise requires sound absorption (to reduce reflections within the engine room and other spaces) and sound isolation (to prevent transmission through bulkheads, decks, and doors from noisy spaces to living and working areas).
The Combined Challenge: Why Standard Solutions Fail at Sea
The marine environment adds a further layer of complexity. Whatever acoustic materials are applied must:
- Survive continuous exposure to saltwater spray, humidity, condensation, and bilge atmosphere
- Resist fuel, oil, lubricants, and hydraulic fluid contamination
- Withstand the elevated temperatures of engine room environments (often 60–80°C continuously)
- Meet marine fire safety standards — IMO (International Maritime Organization) requirements for flame spread, smoke density, and toxicity
- Maintain dimensional stability under the mechanical vibration they are specifically treating
- Remain lightweight — every kilogram of acoustic treatment added represents either payload capacity lost or fuel consumption increased
Standard construction acoustic materials — mineral wool, fibreglass, standard acoustic foam — fail multiple criteria from this list. They absorb moisture, degrade in fuel and oil environments, do not meet IMO fire classifications, and are not engineered for the vibration environment they inhabit.
AquaSonic™ Hull Sound Damping Panels are engineered to meet every one of these criteria simultaneously.
AquaSonic™ Hull Sound Damping Panel: Construction and Technology
AquaSonic™ Hull Sound Damping Panels use a precisely engineered multi-layer composite construction that addresses both structure-borne vibration damping and airborne sound absorption within a single, installation-ready panel system.
Layer 1 — Marine-Grade Facing
The outermost facing layer uses marine-grade reinforced aluminium foil or a high-performance marine fabric, depending on the application. This facing provides:
- Resistance to fuel, oil, hydraulic fluid, and bilge contamination
- Cleanability — wipe-clean with standard marine cleaning agents
- Mechanical protection of the acoustic core beneath
- Fire-retardant surface performance compliant with IMO requirements
- Reflective facing option for high-temperature engine room zones
Layer 2 — Mass-Loaded Vinyl (MLV) Core
The primary noise blocking layer is a high-density Mass Loaded Vinyl (MLV) barrier. MLV is the most effective mass-per-unit-area noise barrier material in acoustic engineering — its high density creates the acoustic mass required to impede the transmission of airborne sound through bulkheads, hull panels, and engine room boundaries.
MLV is inherently resistant to water, fuel, oils, and marine chemicals. It remains flexible and dimensionally stable across the temperature range of marine environments, making it far more suitable for vessel installations than rigid, brittle alternatives. The MLV layer in AquaSonic™ panels is specified to the density required for the target sound transmission loss in each application zone.
Layer 3 — Closed-Cell Damping Foam
Between the MLV mass layer and the hull substrate, a closed-cell viscoelastic damping foam layer converts mechanical vibration energy from the hull structure into heat through internal friction — this is the primary mechanism for addressing structure-borne noise. The closed-cell structure ensures the foam does not absorb bilge water or condensation, preventing the weight gain, mould growth, and structural degradation that open-cell alternatives suffer in the marine environment.
Optional Layer — Absorptive Facing
For applications in engine rooms and mechanical spaces where internal acoustic absorption (reducing the reverberant noise level within the space itself) is also required, AquaSonic™ panels can incorporate an additional open-cell acoustic foam absorption layer on the inward-facing surface, with a perforated or mesh facing to protect the absorptive layer from contamination.
This four-layer construction — facing + MLV barrier + damping foam + absorption layer — provides a complete acoustic treatment in a single panel installation, addressing structure-borne vibration, airborne transmission, and internal reverberation simultaneously.
Technical Specifications
| Parameter | AquaSonic™ Hull Sound Damping Panel |
|---|---|
| NRC (Noise Reduction Coefficient) | Up to 0.9 (configuration-dependent) |
| Primary Noise Mechanisms Addressed | Structure-borne vibration + airborne transmission |
| Core Construction | Multi-layer: MLV + closed-cell damping foam |
| Facing Options | Marine-grade reinforced aluminium foil / high-performance marine fabric |
| Temperature Resistance | Suitable for continuous marine engine room temperatures |
| Moisture / Saltwater Resistance | Closed-cell / sealed construction — resists water ingress |
| Chemical Resistance | Fuel, oil, hydraulic fluid, bilge contamination resistant |
| Fire Performance | Marine fire-retardant grade (IMO-compliant options available) |
| Weight | Lightweight — minimised displacement impact per m² |
| Available Shades / Colours | 30+ shades for interior finish applications |
| Customisation | Cut-to-fit for any vessel geometry; bespoke configurations |
| Design Life | Up to 10 years with proper care and maintenance |
| Installation | Adhesive bond / mechanical fixings; self-adhesive options |
| Manufacture | Indigenously designed and produced in India |
Noise Sources Addressed by AquaSonic™ Hull Damping Panels
AquaSonic™ Hull Sound Damping Panels are specified to treat the following primary noise and vibration sources across vessel types:
Engine Room Noise
The engine room is the primary noise source on any powered vessel. Marine diesel engines, gas turbines, and large electric drives produce broadband noise across the full audible spectrum — with particularly intense low-frequency components (50–500 Hz) from combustion and rotating mass imbalances. Engine room noise transmitted through bulkheads and decks to adjacent crew spaces, passenger cabins, and control rooms is the dominant noise complaint on most commercial and naval vessels.
AquaSonic™ panels installed on engine room bulkheads, deckheads, and deck undersides provide the MLV mass barrier necessary to reduce transmission loss through these structures. Combined with vibration isolation mounts at the engine foundations, a comprehensive engine room acoustic treatment can reduce noise transmission to adjacent spaces by 15–25 dB or more.
Hull Slap and Wave Impact Noise
At speed, wave impact against the hull generates intense impulsive noise — particularly pronounced in aluminium-hulled vessels, fast patrol craft, and lightweight recreational powerboats, where hull plating resonates freely. Wave slap noise can exceed 90–95 dB(A) inside the hull — creating significant discomfort for crew and passengers.
AquaSonic™ damping layers applied to the internal hull skin constrain the vibration of the hull plates, converting the impulsive wave energy into heat rather than allowing it to radiate as noise. Noise reductions of 10–20 dB(A) are achievable in wave slap applications depending on hull material, thickness, and panel coverage.
Propeller and Shaft Noise
Propeller cavitation — the formation and collapse of vapour bubbles at the propeller blade — generates broadband noise that is transmitted through the water and into the hull via the shaft and stern tube. Shaft vibration from propeller imbalance or resonance propagates through the entire hull structure. AquaSonic™ damping panels in the stern sections and around shaft tunnel structures reduce the onward transmission of these vibrations into crew and passenger spaces.
Generator Set Noise
Genset installations — particularly in vessels relying on diesel-electric propulsion or with large hotel loads — generate significant noise and vibration from both the diesel prime mover and the generator. AquaSonic™ panels are used to line genset enclosure structures and the surrounding bulkheads, reducing transmission of both airborne and structure-borne noise from these systems.
HVAC and Auxiliary Machinery Noise
Fans, blowers, pumps, compressors, and HVAC systems contribute to the overall onboard noise environment — particularly in accommodation zones where these systems run continuously. AquaSonic™ panels on HVAC duct routes and auxiliary machinery room boundaries reduce the contribution of these secondary sources to the overall ambient noise level in crew and passenger spaces.
Bulkhead and Deck Transmission
Noise generated anywhere in the vessel propagates through the hull structure and is radiated by every surface in contact with air. Comprehensive AquaSonic™ treatment of major bulkheads and decks between noisy and quiet zones — engine room to crew cabin boundaries, machinery spaces to passenger deck boundaries, generator rooms to mess deck boundaries — forms the foundation of a complete onboard noise control programme.
AquaSonic™ Applications by Vessel Type
Naval Vessels — Warships and Submarines
Acoustic signature is a critical operational characteristic of naval vessels. A warship that radiates excessive underwater noise is detectable at greater range by passive sonar — reducing tactical options and increasing vulnerability. For submarine vessels, acoustic quietness is the primary survivability requirement.
Internal hull acoustic treatment with damping panels is a standard component of naval vessel design — applied to hull frames, bulkheads, deck undersides, and machinery foundations to minimise structure-borne noise transmission to the hull and its radiation into the surrounding water.
AquaSonic™ Hull Sound Damping Panels, manufactured indigenously in India, offer Indian naval shipbuilders and refit facilities a domestically sourced alternative to imported marine acoustic treatment systems — supporting the Make in India programme and reducing strategic supply chain dependence.
Applications in naval vessels: Submarine hull linings, warship engine room bulkheads, propulsion machinery acoustic enclosures, sonar room isolation, crew berthing zone treatment, combat information centre acoustic management.
Commercial Cargo Vessels and Tankers
IMO regulations (specifically MSC/Circ.1206 and earlier instruments) establish maximum noise level limits in various spaces aboard commercial vessels — including engine rooms (110 dB(A)), navigation bridges (65 dB(A)), and crew accommodation (75–80 dB(A)). Meeting these requirements on vessels with high-powered main engines requires systematic acoustic treatment of hull, bulkhead, and deck structures throughout the vessel.
AquaSonic™ panels provide shipbuilders and vessel operators with the acoustic treatment performance necessary to achieve IMO noise level compliance, while meeting the fire, weight, and durability requirements of commercial marine classification societies.
Applications in cargo vessels: Engine room boundary treatment, accommodation deck bulkheads, navigation bridge acoustic isolation, pump room boundaries, generator room cladding.
Passenger Ferries and Cruise Vessels
Passenger comfort is the commercial differentiator for ferry and cruise operations. Noise levels in passenger cabins, lounges, dining areas, and public spaces directly affect the passenger experience and — through online reviews and word-of-mouth — the operator’s commercial reputation.
Passenger vessel operators face the combined challenge of meeting IMO noise regulations and delivering the acoustic comfort environment that passenger expectations demand — which typically requires noise levels significantly below the regulatory maximums. AquaSonic™ Hull Sound Damping Panels provide the acoustic treatment performance necessary for premium passenger vessel environments.
Applications in passenger vessels: Cabin deck bulkheads, public area deckheads, engine room boundaries, stabiliser machinery spaces, bow thruster compartments, passenger corridor treatment.
Offshore Platforms and Support Vessels
Offshore drilling platforms, production vessels, and construction support ships operate in some of the world’s most demanding acoustic environments. Drilling machinery, mud pumps, compressors, cranes, and DP thruster systems generate enormous quantities of noise — in spaces where personnel live, work, and sleep around the clock.
Occupational noise exposure limits for offshore personnel are strictly regulated, and the consequences of non-compliance — including hearing damage, fatigue, communication failure, and regulatory penalty — are severe. AquaSonic™ treatment is specified in offshore environments for both regulatory compliance and crew wellbeing.
Luxury Yachts and Motor Cruisers
The luxury marine sector demands near-total acoustic transparency — owners and guests expect the onboard environment to feel quiet, calm, and insulated from the mechanical world that powers the vessel. This requires comprehensive acoustic treatment across hull, engine room boundaries, and accommodation structures.
For luxury yacht builders and refit specialists, AquaSonic™ panels offer the acoustic performance required for premium interior environments, in the lightweight, marine-safe construction that the weight-sensitive yacht platform demands. The 30+ available shades allow panels to be specified in finishes that complement premium interior design schemes.
Recreational Powerboats and River Vessels
Even at smaller scales — inboard powerboats, river cruisers, and houseboat conversions — hull and engine noise significantly affects onboard comfort. AquaSonic™ panels are available in configurations appropriate for smaller vessel applications, providing effective noise reduction without the weight or cost overhead of commercial marine systems.
The India Advantage: Indigenous Marine Acoustic Manufacturing
India’s maritime sector is growing rapidly. The Indian Navy’s shipbuilding programme — including destroyer, frigate, submarine, and offshore patrol vessel construction — along with India’s expanding commercial shipping and offshore energy sectors, creates significant and growing demand for high-performance marine acoustic treatment systems.
Until recently, the most capable marine acoustic damping solutions were sourced from international suppliers — with associated import costs, long lead times, supply chain vulnerability, and absence of domestic technical support.
AquaSonic™ Hull Sound Damping Panels are designed and manufactured in India — at Packsound’s production facility in Greater Noida — using advanced indigenous acoustic technology. This provides Indian naval architects, shipbuilders, vessel operators, and refit facilities with:
- Domestic sourcing — no import lead times, no customs complexity, no foreign exchange exposure
- Make in India alignment — supporting the government’s indigenisation policy for defence and strategic sectors
- Direct technical support — Packsound’s acoustic engineering team is available for consultation, site visits, and specification support without the barriers of international time zones and support structures
- Customisation flexibility — bespoke panel dimensions, configurations, and specifications developed in direct collaboration with Indian vessel builders and designers
- Competitive pricing — domestic manufacturing economics versus equivalent imported products
For Indian naval and defence procurement, AquaSonic™ represents the only indigenously manufactured, performance-proven marine acoustic panel system currently available at scale.
Installation: How AquaSonic™ Hull Sound Damping Panels Are Applied
AquaSonic™ panels are designed for practical installation within the constrained access conditions of active vessel construction and refit environments. Installation methods include:
Adhesive bonding: For hull skin and bulkhead applications, panels are bonded directly to the substrate using marine-grade contact adhesives. Surface preparation — degreasing and priming — is essential for bond integrity, particularly in engine room environments contaminated with fuel and oil residues.
Mechanical fastening: In high-vibration zones where adhesive bond integrity under sustained vibration must be supplemented, mechanical fixings (marine-grade stainless steel fasteners) provide additional retention. Fixing points are sealed to prevent acoustic flanking paths.
Self-adhesive formats: Selected AquaSonic™ panel configurations are available with factory-applied self-adhesive backing for rapid installation in clean, accessible applications — reducing installation time and eliminating the need for separate adhesive application.
Custom cutting and fabrication: Marine vessel interiors are geometrically complex — frames, stiffeners, penetrations, and curved hull surfaces require panels to be cut and fitted around obstacles. AquaSonic™ panels are supplied in formats that can be cut to precise dimensions on site using standard hand tools, allowing accurate fitting to any hull geometry.
Sealing of edges and penetrations: Acoustic effectiveness depends critically on eliminating flanking paths — routes by which noise bypasses the treated surface through gaps, joints, cable glands, pipe penetrations, and hatch perimeters. Packsound’s installation guidance specifies appropriate sealing methods for all penetrations and edges.
Why Choose AquaSonic™ from Packsound for Marine Acoustic Treatment
Dual-Mechanism Performance
AquaSonic™ Hull Sound Damping Panels address both structure-borne vibration and airborne sound in a single panel system — eliminating the need to specify and install separate damping and absorption products for each application zone.
Indigenously Manufactured in India
The only performance-grade marine acoustic damping panel system designed and produced within India — providing supply chain security, domestic pricing, and alignment with Make in India procurement policies.
Marine Environment Engineering
Every material specification in AquaSonic™ panel construction has been selected for performance in the marine environment — saltwater resistance, fuel and oil tolerance, temperature range, IMO fire compliance, and long-term dimensional stability under vibration.
Customisation at Scale
Panel dimensions, layer configurations, facing materials, and colour specifications are all available as custom options — allowing AquaSonic™ to be precisely specified for each vessel type, zone, and performance requirement without off-the-shelf compromise.
Packsound’s Broader Acoustic Expertise
Marine acoustic treatment rarely exists in isolation. Vessels also require acoustic treatment of crew accommodation spaces, control rooms, passenger areas, and specialised rooms — drawing on the same acoustic principles as architectural acoustic treatment. Packsound’s expertise across both marine and architectural acoustic applications means a single technical partner can address the complete vessel acoustic brief.
Explore the broader AquaSonic acoustic solutions range for wet-area and moisture-resistant applications, and Packsound’s full acoustic ceiling panels and acoustic wall panels ranges for complementary interior acoustic treatment.
Frequently Asked Questions
What is the difference between structure-borne and airborne noise on a vessel?
Structure-borne noise originates as mechanical vibration in rotating or reciprocating machinery and travels through the vessel’s hull, frames, and bulkhead structure before radiating as sound in adjacent spaces. Airborne noise travels directly through the air from a source (such as a running engine) and is transmitted through openings, thin panels, and bulkheads. Effective marine acoustic treatment must address both: damping layers for structure-borne noise and mass barrier / absorption treatment for airborne noise. AquaSonic™ Hull Sound Damping Panels incorporate both mechanisms in a single multi-layer construction.
Do AquaSonic™ panels meet IMO noise regulations?
AquaSonic™ Hull Sound Damping Panels are available in configurations designed to support compliance with IMO noise level requirements for commercial vessels under MSC/Circ.1206 and related instruments. The specific panel specification required to achieve compliance in any given application depends on the existing vessel construction, the noise sources present, and the target space category. Packsound’s marine acoustic team can assist with noise level assessment and panel specification for IMO compliance projects.
Can AquaSonic™ panels be used in submarine applications?
Yes. AquaSonic™ Hull Sound Damping Panels are suitable for submarine hull lining applications — providing the internal hull treatment that reduces structure-borne vibration radiation from propulsion and auxiliary machinery into the pressure hull and surrounding water. For submarine applications, specific attention to panel weight, off-gassing characteristics, and fire classification is required. Contact Packsound’s defence acoustic team for submarine-specific consultation.
How are the panels fixed in an engine room environment with contamination?
In engine room environments contaminated with fuel and oil residues, surface preparation before adhesive installation is critical. AquaSonic™ installation guidance specifies the use of appropriate degreasing agents and compatible marine-grade primers to ensure bond integrity on contaminated substrates. Mechanical supplementary fixings are recommended in high-vibration zones adjacent to main engine foundations and gearbox installations.
Are the panels fire-rated for marine use?
Yes. AquaSonic™ panels are available in marine fire-retardant grade configurations. For commercial vessels subject to SOLAS (Safety of Life at Sea) requirements and IMO fire protection codes, panels can be specified with facing and core materials that meet the applicable flame spread, smoke density, and toxicity requirements. Classification society approval documentation is available for qualifying configurations.
What noise reduction can I expect from AquaSonic™ panels?
Noise reduction depends on the application, panel configuration, coverage extent, and the source characteristics of the noise being treated. For airborne sound transmission through bulkheads and decks, AquaSonic™ MLV-core panels provide transmission loss in the range of 20–35 dB depending on core weight and configuration. For structure-borne vibration and hull slap, damping layer applications typically reduce radiated noise by 10–20 dB(A). Combined treatments of engine room boundaries achieve total noise reductions to adjacent spaces in the 20–30 dB(A) range.
How long do the panels last in a marine environment?
AquaSonic™ Hull Sound Damping Panels are designed for a service life of up to 10 years with proper installation and maintenance. The closed-cell foam and MLV construction resist the primary degradation mechanisms in the marine environment — moisture absorption, chemical attack, and thermal cycling — that cause premature failure in standard acoustic materials.
Can panels be specified in custom dimensions for complex hull geometries?
Yes. AquaSonic™ panels can be supplied in custom dimensions appropriate for specific hull geometries, frame spacings, and bulkhead layouts. For complex vessel applications, Packsound can also supply panels in oversize formats for on-site cutting and fitting to precise dimensions by the installation team.
Get a Marine Acoustic Consultation for Your Vessel
Whether you are a naval architect specifying acoustic treatment for a new build, a shipyard managing a vessel refit, a vessel operator addressing crew noise complaints, or a defence procurement team evaluating indigenous marine acoustic solutions — Packsound’s AquaSonic™ team has the product, the technical capability, and the manufacturing resources to support your project.
Contact us with:
- Vessel type and size
- Primary noise sources and problem zones
- Applicable regulatory framework (IMO, SOLAS, Navy, Classification Society)
- Target noise levels and application zones
- Build / refit timeline
We will respond with a technical assessment and AquaSonic™ panel specification tailored to your vessel’s requirements.
Visit Us: A-719 Tower 3, NX One Techzone IV, Greater Noida West, Uttar Pradesh 201306, India
Email: sales@packsound.in | abhinav@packsound.in Call: +91 980 980 2016 | +91 9990 858 797 Hours: Monday to Saturday, 9:00 AM to 7:00 PM
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AquaSonic™ Hull Sound Damping Panel is part of the AquaSonic™ specialist acoustic range by Packsound — a brand of Ecotone Acoustic Limited, manufacturer of advanced acoustic solutions for marine, industrial, and architectural applications across India.