Table of contents
- Controlling engine noise: a major industrial challenge
- The acoustic challenge of combustion engines
- A dual solution to reduce noise pollution
- The contribution of digital simulation to dimensioning
- The BOËT Group’s expertise in engine acoustics
- Conclusion: call on an expert partner
The acoustic challenge of combustion engines
During intensive operation, the motors produce an impulse noise of up to 140 dB. This noise level is particularly problematic because it is concentrated in the low and medium frequencies, between 20 Hz and 1 kHz. The pressure waves generated reflect back into the ducts, causing internal acoustic interference. If left untreated, this noise compromises regulatory compliance, reduces operator comfort and accelerates mechanical fatigue of surrounding structures.
A dual solution to reduce noise pollution
The engine silencer developed by the BOËT Group combines two complementary approaches to achieve a high level of acoustic performance: reactive attenuation and dissipative attenuation. This dual treatment covers the entire sound spectrum while optimizing exhaust flow dynamics.
Reactive processing for low frequencies
Reactive attenuation is based on the reflection and cancellation of sound waves by interference. The silencer incorporates resonance chambers, impedance breaks and specific resonators such as Helmholtz, quarter-wave or Herschel-Quincke devices. These elements are designed to target low frequencies, often the most problematic in industrial environments. This treatment is particularly well suited to motors installed in environments such as ICPE industrial sites, cogeneration units or pneumatic conveying installations.
Dissipative treatment for medium and high frequencies
Dissipative attenuation completes the system by treating higher frequencies through acoustic absorption. Sound-absorbing materials such as mineral wools or technical foams are used to capture sound energy. Their porous structure, tortuosity and air resistivity transform sound waves into heat through friction and deformation. This treatment provides optimum acoustic protection for applications in the food industry, water treatment plants and technical buildings.
The contribution of digital simulation to dimensioning
The BOËT Group relies on advanced simulation tools to guarantee precise acoustic sizing for each project. Finite element modeling (FEM) is used to evaluate the acoustic response of the engine silencer, while CFD (Computational Fluid Dynamics) simulations are used to quantify pressure losses. Fluid-acoustic coupling optimizes the balance between sound attenuation and maintaining the engine’s thermodynamic performance. This design approach not only effectively reduces noise, but also preserves the equipment’s energy efficiency.
The BOËT Group’s expertise in engine acoustics
With over 60 years’ experience, the BOËT Group is a key player in the field of industrial acoustic solutions. The company boasts extensive know-how in engine acoustics, as well as in vibration studies, modal analysis, industrial building acoustics and industrial process acoustics. Certified ISO 9001, EN 15085, ISO 19443 and DNV, the BOËT Group designs customized acoustic equipment for motors, turbines, generators and compressors in the most demanding sectors, including the nuclear, pharmaceutical and petrochemical industries. Compressor, booster and engine silencers benefit from precision engineering based on field experience and simulation.
Conclusion: call on an expert partner
Are you looking for a reliable solution to reduce the noise generated by your industrial motors? The acoustic silencers designed by the BOËT Group combine acoustic performance, durability and optimum integration into your processes. Thanks to its recognized expertise and an approach based on modeling and industrial acoustic studies, the BOËT Group can help you implement acoustic protection solutions tailored to your regulatory, environmental and technical challenges. Contact the Groupe BOËT for a customized solution or a personalized quote.
