Abstract
A Tuned Mass Damper (TMD) for reducing vibration and noise radiation from rails incorporates a series of oscillation mass ( 8 ) of different sizes held in position by layers of resilient material ( 9 ) and attached to the rail via several steel mounting plates ( 4 ). Each mounting plate ( 4 ) is fixed to the rail by two magnets ( 5 ). A bolt ( 10 ) is inserted through the mounting plates ( 4 ), resilient layers ( 9 ) and oscillation masses ( 8 ) alternatively. The bolt ( 10 ) is fixed to a middle mounting plate ( 4 ) such that different compressive forces can be provided on the two sides by tightening nuts ( 11 ) to different pre-set torques. When the resonance frequency of the oscillation masses ( 8 ) is tuned to that of rail, most of the rail vibration energy at resonance frequency is transferred to the oscillation masses ( 8 ) and eventually dissipated in the resilient layers ( 9 ).
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