Frequency – a decisive factor in technical sound insulation for machines and vehicles
Frequency (Hz) describes the number of vibrations per second of a sound wave and is a key concept in acoustics and technical sound insulation. The frequency of a noise determines how we perceive it – we perceive low frequencies (e.g. engine humming) as muffled, while high frequencies (e.g. whistling or hissing) sound shrill.
In the field of sound insulation for machines, vehicles and industrial plants, it is crucial to select suitable materials that are specifically tailored to the respective frequency ranges of the noise.
Frequency ranges in sound insulation
Sound frequencies are divided into three main ranges:
- Low-frequency sound (below 250 Hz) – caused by engines, fans, transformers and large machines
- Mid-frequency sound (250–2000 Hz) – typical for speech, machine noise and traffic noise
- High-frequency sound (above 2000 Hz) – caused by hissing, grinding noises or electronic components
For effective sound insulation, soundproofing materials must be specifically tailored to the frequency ranges of the noise source.
Cellofoam soundproofing solutions for different frequencies
To efficiently reduce machine and vehicle noise, Cellofoam offers customised soundproofing and absorption solutions for different frequency ranges:
✔ Low-frequency sound sources – use of heavy foils and bitumen heavy foils to dampen low tones by increasing mass
✔ Mid-frequency noise – use of acoustic foams and/or non-wovens to reduce speech and machine noise
✔ High-frequency sound – optimum attenuation through open-cell acoustic materials and special foams
Areas of application for frequency-dependent sound insulation
- Vehicle technology & buses – reduce engine and transmission noise, increase driving comfort
- Mechanical engineering & plant construction – minimise production noise & comply with legal requirements
- Rail vehicles – optimise structure-borne noise & airborne noise with multi-layer acoustic solutions
- Housing & cabin construction – frequency-specific insulation for compressors, pumps & generators
Conclusion
The right choice of soundproofing materials depends largely on the frequency of the noise. With Cellofoam's high-quality sound insulation and absorption solutions, machines, vehicles and industrial plants can be specifically optimised to efficiently reduce noise and improve acoustics.
✉ Contact us for tailor-made soundproofing solutions for your specific frequency ranges!