For situations demanding even greater noise attenuation, special custom systems are available. These enhanced systems might involve using a heavier, thicker gauge panel shell. Thicker acoustic panels, containing more sound-absorbing material, are another option. A particularly effective custom solution is an “enclosure within an enclosure” design. This creates multiple barriers and air gaps, significantly boosting sound isolation.

The acoustic panels within these enclosures are meticulously designed. They are engineered for applications where a higher transmission loss is essential. Transmission loss quantifies how effectively a barrier reduces the passage of sound. Standard panels feature a robust layered construction. The outer solid shell is typically fabricated from 16-gauge steel. This provides a durable exterior and reflects sound waves. The inner shell is made from 22-gauge perforated steel. The perforations allow sound to pass into the absorptive core of the panel.

To further enhance acoustic performance, a high-mass septum is added within the panel. This dense layer is critical for blocking sound transmission. The structural integrity of the panels is ensured by 18-gauge internal channels and edge rails. These components stiffen the panels, preventing them from vibrating and transmitting noise.

The acoustic grade fill material within the panels is crucial for sound absorption. This fill is typically composed of 2.5 to 6 pounds per cubic foot (pcf) long-strand fiberglass or mineral wool. The specific material is chosen based on the application’s unique requirements. These fill materials boast several important properties. They are inert, meaning they do not react chemically with their surroundings. They are resistant to mildew growth. They are also vermin proof, preventing pest infestations. Critically, they are incombustible, adding a significant safety factor. These high-performance panels are commonly available in 4-inch or 6-inch thicknesses. Thicker panels generally provide superior performance, especially in controlling low-frequency noise.

Adding mass is a fundamental and effective strategy for isolating an instrument or any sound source. When you increase the mass of a system, you also increase its acoustic impedance. Impedance, in this context, is the resistance to the passage of sound energy. A system with higher impedance requires more energy to be set into vibration. Sound waves carry energy; therefore, a massive barrier is more difficult for sound waves to move. This principle makes adding mass to an object an effective means of eliminating low-frequency noise. Low-frequency sounds, often perceived as rumbles or hums, tend to be lower in energy but are notoriously difficult to control. Massive structures are adept at blocking these pervasive sounds.

While increased mass is beneficial for acoustic control, extremely massive systems can introduce their own set of challenges. These primarily relate to mobility and overall usability. AKINCO acoustic enclosures are intentionally designed to be massive to achieve their high sound reduction targets. However, the company employs a number of advanced technologies and intelligent design strategies. These are specifically aimed at mitigating the practical difficulties associated with using a heavy, massive enclosure. This might include modular construction for easier transport and assembly, integrated lifting points, or designs that maintain accessibility for equipment maintenance. The goal is to strike an optimal balance between superior acoustic performance and real-world practicality, ensuring the enclosures are both effective and user-friendly.

The applications for acoustic enclosures are diverse. Internally, they can house loud machinery on a factory floor, protecting workers and improving the overall work environment. Generators inside buildings, pumps, or compressors can be effectively quieted. Externally, enclosures are used for HVAC units, power transformers, or industrial chillers, preventing noise from disturbing nearby residential areas or businesses. This helps companies meet local noise regulations and maintain positive community relations.

The benefits extend beyond just noise reduction. For employees, reduced noise exposure means better hearing protection, lower stress levels, improved concentration, and potentially increased productivity. For businesses, this can translate to a safer workplace, adherence to noise regulations, and a better public image. The durability of the materials used, such as treated steel and resilient acoustic fill, ensures a long service life for these enclosures, even in demanding industrial conditions. Regular maintenance, such as checking seals and panel integrity, will ensure continued optimal performance over many years.

In essence, acoustic enclosures represent a sophisticated approach to managing and controlling noise. Through thoughtful design, appropriate material selection, and an understanding of acoustic principles like mass and absorption, effective sound isolation is achieved.

Reference:

For further information on sound transmission and acoustic principles, a helpful resource is The Engineering Toolbox, which discusses concepts like sound transmission loss: Engineering Toolbox