Other

British Steel Plc.

John Barry Clarke

David Farrington

William H Hodgson

Christopher John Cedric Jones

Peter J Webb

David John Thompson

Steven S Baker

A damper for reducing the track nose emitted by a rail system comprises a deformable material attachable to a surface of the rail, incorporating a plurality of elongate discontinuous resonant members of a stiff material as compared to the deformable material, sized to contain at least two resonant frequencies in the range of interest. The resonant members are suitably of steel or other metallic material. They can be of different profile, to form a resonant system with at least two resonant frequencies in the relevant frequency range. They are suitably embedded in the deformable material, to ensure adequate vibrational transfer from the rail to the resonant members and also provide environmental protection. The deformable member is visco-elastic, for example rubber or rubber-like material. This may be preformed and glued to the rail, or it can be cured in place on the rail. The damper is positioned on the rail at the junction between the web and the foot of the rail. One resonant member can be an elongate angled section, the angle preferably matching the angle between external surfaces of the head and foot. Another resonant member can be a solid elongate block, the external faces adjacent the web and foot being angled to match.

Rail fixings

A method of controlling the depth of immersion of an oxygen lance in a molten bath within an electric arc furnace where noise emitted from the furnace during lancing in an acoustic spectrum ranging between 1 kHz and 15 kHz defined by a plurality of selected frequency bands is monitored. The position of the lance with respect to the bath surface is controlled by reference to the amplitudes of the output signals emitted from each of the selected frequency bands. There is a distinct change in the relationship of particular bands to provide a 'lance out' signal which is directed to a control for a lance drive mechanism. Apparatus for practicing the method includes a microphone, a filter unit, a microprocessor and a lance drive responsive to signals from the microprocessor.

Lancing in electric arc steelmaking

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Rotherham, United Kingdom

John Barry Clarke