Constrained Layer Damping of Chute

SSAB in Oxelösund is one of the world’s largest producers of advanced steel for various industries. The steel mill is running day and night, and some of the production uses recycled steel as raw material. Metal scrap is then being dropped into a large chute, causing high noise levels disturbing the surroundings. Constrained Layer Damping of the chute was necessary to address this issue.

SSAB contacted Vibratec to solve the problem with the disturbing noise radiating from this chute. The solution should provide sufficient damping over a broad frequency range as well as over a broad temperature range.

CLD-panels

Vibratec installed CLD-panels (Constrained Layer Damping) to cover the entire surface of the chute. The optimum loss factor for constrained layer damping (CLD) depends on temperature, thickness of layer, frequency and shear modulus of the damping layer, among many other parameters.

The CLD-materials used at SSAB was a combination of two damping materials – one optimal for winter temperatures, one for summer – ensuring a high loss factor in a wide range from -10 °C to +25 °C. In addition, they also work just as well for low frequency and up to app. 1000 Hz.