The force transmissibility of a floating slab track
The force transmissibility of a track isolation system is the ratio of the force transmitted to the track bed over the force applied at the railheads. This paper focuses on the force transmissibility of a double-tie or ‘mini-slab’ floating slab track installation. The power spectral densities of the forces transferred to ground due to ‘white noise’ force sources at the rail heads are calculated. Analytical models and the Finite Element (FE) method are used to analyse a floating slab track supported on a rigid foundation. The effect of rail fastener stiffness is discussed. The influence of the flexibility of the floating slabs and the effects of a non-rigid foundation on the force transmissibility is investigated within the framework of the FE method.
Structure-Borne Noise and Vibration Control for Chatswood Interchange
The Chatswood Interchange project is a transit-oriented development combining multi-family residential and commercial development with a commuter rail station in Chatswood, NSW, Australia. The train station and garage structure would directly support 40-storey residential condominium towers and commercial spaces without benefit of structural breaks or building isolation. The vibration control provisions incorporated into the design include floating slab track, a massive and thick concrete deck, and large cross-section columns. Structure-borne noise and vibration levels were predicted with a finite element model, using an enforced relative displacement between wheel and rail. The predicted structure-borne vibration levels were compared with vibration levels measured at the top of the station structure during partial completion and found to be in reasonable agreement with prediction.
NOISE AND VIBRATION FROM HIGH-SPEED TRAINS. CHAPTER 5. MEASUREMENTS OF RAILWAY NOISE
The measurement of exterior noise is discussed with reference to source localisation, type testing, sound pressure level versus sound power level, rail noise directivity, time weighting, frequency weighting, the distance between track and microphone, general measurement conditions, regulations and noise limits, noise emission monitoring, special noise perception measurement techniques, and non-acoustic factors influencing exterior rail noise (wheel and rail roughness, speed and braking). The diagnosis and type testing of interior noise is briefly considered. For a covering abstract see ITRD E109863.