How do you reduce noise in vehicles, rolling stock, and heavy equipment?

How are acoustic materials used in vehicles and rolling stock?

Acoustic materials are widely applicable in various types of vehicles and rolling stock, such as: 

• Campers and caravans: Reducing engine noise, road noise, and vibrations inside the vehicle, for example through air conditioning/heating units etc. Creating an acoustically and thermally comfortable interior environment.
• Delivery vans and commercial vehicles: Insulation of cargo areas, cabins, and engine compartments.
• Passenger cars: Damping engine and road noise, for example through engine insulation and reducing vibrations and resonances in body panels and the chassis.
• Agricultural vehicles: Reducing engine noise and vibrations. Soundproof lining of cabins.
• Construction machinery (such as excavators, wheel loaders, dumpers): Noise reduction in cabins and engine compartments for increased comfort and safety.

What acoustic measures are available?

Sound absorption, Absorbs sound within enclosed spaces such as cabins, engine rooms, or technical compartments. Reduces reflections, hollow sounds, and lowers the generated noise level  

Sound insulation, prevents sound from transferring from the source to other parts of the vehicle or machine. For example, by adding mass or multilayer constructions in floors, walls, or engine covers. 

Vibration damping, Reduces vibrations from engines, hydraulic systems, or other moving parts. This prevents resonance and structural sound transmission to the interior or chassis. 

Note: Low frequencies such as diesel engine noise often require thicker materials. However, thinner solutions can also be effective, especially when combined with smart placement and material selection.