Study on the Influence of Floating Slab Track on Low Frequency Noise of Bridge Sections of Regional Railways
Floating slab track is a kind of vibration-absorbing track structure,which can effectively reduce the force transmission rate between the track and the bridge through the vibration isolation device,so as to ensure a high vibration reduction effect.Therefore,floating slab track is widely used as an important measure to reduce bridge noise in many engineering cases.However,the floating slab track itself is also an important low-frequency noise source.In previous studies,the acoustic radiation of the track slab itself is rarely considered when considering the bridge noise.In view of this problem,this paper takes the urban train-floated slab track structure as the research object,and uses the finite element and boundary element methods to analyze the bridge noise and floating slab noise of the urban railway.The following conclusions are obtained:if the noise of the floating slab track itself is not considered,the floating slab track structure can effectively reduce the low-frequency noise of the urban train bridge section by 15 dB;If the noise of the floating slab track itself is considered,the noise reduction effect of the floating slab track structure is not significant.The results show that the acoustic radiation of the track plate itself should not be ignored in the low-frequency noise analysis outside the vehicle.
acousticsfloating slab trackbridge noiselow frequency noiseregional railway
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