轨道技术研讨会-英国钢厂CORUS集团原厂技师主讲.ppt

Corus Rail Products Silent Track Railway noise reduction system October 2007 Silent Track - Introduction Corus Rail’s Silent Track developed out of a E.U. part-funded research project to reduce noise generated by railways. Full scale testing gave 5 to 7dB noise reduction. Silent Track reduces noise generated by rails as train wheels pass over them. The system employs patented “tuned dampers” which are attached to either side of the rail. The dampers are designed to suit a particular track-form, and are tailored to meet Clients size requirements. They can be attached to track in-situ, either by high-performance glues or by a specifically designed clip. We are also developing the product to enable dampers to be attached onto rail at Hayange before the rail is installed onto track. Silent Track – noise reduction Rail as a Noise Source Vibration energy from wheel rail contact 50 to 5000 Hz Wheel rail and sleepers all radiate Vertical modes dominate Vibrating Length of track is important - size of source Noise depends on decay of vibration with distance – the lower the decay rate, the greater the vibrating length of rail. Effect of Damping on Rail Vibration Decay rate can be increased by the addition of rail damping This reduces the displacement of the vibration waves along the rail, and therefore reduces the vibrating length of the rail, and hence the noise emitted Effect of Tuned Rail Dampers on Decay Rate The red line shows the increased decay rate on a track fitted with Silent Track tuned rail dampers, compared with the undamped track in blue SilentTrack? - How does it work? Silent Track – Damper design The design of a damper is a two stage process. Firstly, the Clients requirements define the shape of the damper and fixing method Second, the track characteristics enables Corus to design the internal arrangement (steel size and spacing) of the damper to give the most effective noise reduction SilentTrack? - Tuned Absorber - Details Silent Track – Market Developm