By John Jordan
An Illustrated advisor to Battleships and Battlecruisers
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Extra resources for An Illustrated Guide to Battleships and Battlecruisers
Experience on the Japanese high-speed network since the late 1970s [3, 4] has shown that the non-linear process of wave steepening during propagation along the tunnel depends on the tunnel length and on the friction effects. Thus, with the change from ballasted to slab track the likeliness of emission of significant micro-pressure waves increased for the two longest tunnels on the line, the Euerwang tunnel with a length of 7700 m and the Irlahüll tunnel with a length of 7260 m. In fact, during test runs in December 2005 with train speeds up to 330 km/h noticeable sonic boom incidents were observed near the portals of both tunnels.
The results of the SCPT tests confirm these observations. 03 for the material damping ratio β of all soil layers in deviatoric and volumetric deformation. A value of 1/3 has been assumed for the Poisson’s ratio and a density ρ equal to 2000 kg/m3 . 60 m by monoblock concrete sleepers. The rails are continuously welded and are fixed with a Pandrol E2039 rail fastening system and supported by resilient studded rubber rail pads with a thickness of 11 mm. Each rail pad is preloaded with a clip toe load of about 20 kN per rail seat.
Thresholds of annoyance in terms of sound exposure have been determined by surveys throughout the world. However, for animals, the effects are not easily determined. Much of the research on noise effects on animals relates to aircraft over-flights, especially in military training areas. Some research on highway noise effects has been performed. But so far nothing has been reported on the potential effects of high-speed train noise on wild or domestic animals. As more high-speed rail systems are developed, there is a potential for tracks being laid through normally quiet wilderness areas where the intrusive noise from train pass-bys could result in a permanent change in the environment.
An Illustrated Guide to Battleships and Battlecruisers by John Jordan