Acoustic enclosures
Soundproofing hoods are used for passive noise reduction on machines and systems with high sound power levels. The use of soundproofing hoods is governed by official noise regulations for both noise in the workplace and noise pollution in the vicinity of industrial plants. The sound insulation achievable with sound insulation hoods is essentially determined by the mass of the hood's outer shell.
The best insulation effect can be achieved with an extremely flexible shell of high mass. However, the ideal flexible design is not feasible for structural and static reasons due to the often required self-supporting construction.
Diesel and gas-powered combustion engines, refrigeration machines and compressors generate low-frequency noise – some of which is highly monotonous – up to approximately 200 Hz. Gas and steam turbines predominantly generate high-frequency noise with maximum levels of approx. 1,000 to 4,000 Hz. Our soundproof enclosures must therefore be optimally designed for both frequency ranges.
However, high sound insulation levels can only be achieved if the hood has stable components and can be carefully constructed and installed without gaps or leaks.
Taking all requirements into account resulted in a modern, flexible sound insulation system that stands out thanks to the following special features:
- Maximum possible insertion loss in the low frequency range. The intake, ignition and compression noises that dominate in such systems are predominantly in frequency ranges up to approx. 200 Hz. Our hood system is designed to achieve an insertion loss of 25 dB at a third octave centre frequency of 63 Hz, for example.
- In the frequency range between 100 and 4000 Hz, we guarantee an insertion loss of 30 dB, a value that can only be achieved with removable hoods through considerable design efforts.
- Despite these high insertion loss values, the hood is designed as a modular system: the individual wall elements, which are available in various dimensions, are attached to a solid frame construction using a new type of quick-release fastening system. All wall elements can be easily and quickly assembled and disassembled from the outside by one person.
- The stable frame construction is set up with structural sound insulation. This prevents resonance phenomena in individual hood parts caused by vibrations in the installation area.
- The hood is weatherproof and therefore suitable for installation outdoors as well as in factory rooms, basements, etc.
- Specially designed supply and exhaust air silencers in conjunction with powerful fans ensure perfect ventilation of the interior of the hood. Doors, windows, supply lines, etc. are integrated into the sound insulation system.
- The use of suitable modular construction minimises the costs of this high-quality sound insulation for the respective application.
