What is the WHIS®damper / CLD?

The WHIS® damper is based on the principle of
“Constrained Layer Damping” and effectively
reduces vibrations in steel bridges. A special
viscoelastic material is clamped between the bridge
components and a thin steel plate. This material
converts the kinetic energy generated by vibrations
into heat, thereby reducing noise emissions. The
damper is attached using a self-adhesive layer
directly on the bridge, additionally secured by
weather-resistant special magnets.

  • High noise reduction
  • Cost-effective solution
  • Long lifespan
  • Barely visible

The WHIS®damper’s advantages

Easy to install

The WHIS® damper panels are attached without screws or welding.

Barely visible

Since the panels are installed underneath the bridge in RAL color, they are barely visible.

High noise reduction

The WHIS® damper can reduce noise from steel bridges by up to 9dB.

Installing and maintaining the WHIS®damper

• The WHIS® damper is delivered as a complete product.
• The steel plates are attached to the predetermined bridge
sections using the self-adhesive layer.
• Quick installation.

Where can you apply the WHIS®damper?

The WHIS®damper is suitable for 2 kinds of steel bridges, like

Steel railway bridges

Steel bridges

Our solutions for reducing traffic noise

WHIS®stone

This is a concrete diffractor, placed directly next to the road at ground level, realizing a 2.5 dB noise reduction, equal to silent asphalt.

WHIS®wall

The WHIS®wall combines a low noise barrier with a weathering steel diffractor. That amounts to 1 meter in height, all in all. It achieves a 7 to 9 dB noise reduction, equal to a 3 meter regular noise barrier.

WHIS®top

This is a lightweight aluminum diffractor, that can be mounted on most existing noise barriers. At only 0.2 meters in height, it’s good for a 4 to 5 dB reduction, equal to what you’d achieve by raising the barrier 2 meters.

Want to see diffraction at work? See the video.

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Projects

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