TY - GEN
T1 - Measures to counteract micro-pressure waves radiating from tunnel exits of DB's new Nuremberg-Ingolstadt high-speed line
AU - Tielkes, Thorsten
AU - Kaltenbach, H. J.
AU - Hieke, M.
AU - Deeg, P.
AU - Eisenlauer, M.
PY - 2008
Y1 - 2008
N2 - In December 2005, when first test runs were carried out on the new high speed line Nuremberg-Ingolstadt, significant sonic boom incidents occurred at the portals of the 7700 m long Euerwang tunnel and the 7260 m long Irlahüll tunnel. Both double-track tunnels with a cross section of 92 m2 were originally planned to be built with ballasted track. When a change to slab track was decided, no changes in the design of the already built tunnels were introduced. In order to reduce micro-pressure wave emissions and to ensure an in-time start of commercial railway operation, DB decided to take immediate countermeasures by equipping the two tunnels with acoustical track absorbers. These absorbers are designed to counteract railway noise, but also affect via dispersion and friction the pressure wave steepening process. With the installation of these absorbers the wave steepening process was significantly inhibited and, thus, commercial operation could start successfully in May 2006 without operational restrictions. A simplified formula based on the solution for the vibrating piston which was developed at RTRI appears to be well suited for the prediction of the amplitude and frequency content of the emitted micro-pressure wave in the vicinity of the tunnel portal.
AB - In December 2005, when first test runs were carried out on the new high speed line Nuremberg-Ingolstadt, significant sonic boom incidents occurred at the portals of the 7700 m long Euerwang tunnel and the 7260 m long Irlahüll tunnel. Both double-track tunnels with a cross section of 92 m2 were originally planned to be built with ballasted track. When a change to slab track was decided, no changes in the design of the already built tunnels were introduced. In order to reduce micro-pressure wave emissions and to ensure an in-time start of commercial railway operation, DB decided to take immediate countermeasures by equipping the two tunnels with acoustical track absorbers. These absorbers are designed to counteract railway noise, but also affect via dispersion and friction the pressure wave steepening process. With the installation of these absorbers the wave steepening process was significantly inhibited and, thus, commercial operation could start successfully in May 2006 without operational restrictions. A simplified formula based on the solution for the vibrating piston which was developed at RTRI appears to be well suited for the prediction of the amplitude and frequency content of the emitted micro-pressure wave in the vicinity of the tunnel portal.
UR - http://www.scopus.com/inward/record.url?scp=42149120760&partnerID=8YFLogxK
U2 - 10.1007/978-3-540-74893-9_6
DO - 10.1007/978-3-540-74893-9_6
M3 - Conference contribution
AN - SCOPUS:42149120760
SN - 9783540748922
T3 - Notes on Numerical Fluid Mechanics and Multidisciplinary Design
SP - 40
EP - 47
BT - Noise and Vibration Mitigation for Rail Transportation Systems
A2 - Schulte-Werning, Burkhard
A2 - Thompson, David
A2 - Gautier, Pierre-Etienne
A2 - Hanson, Carl
A2 - Hemsworth, Brian
A2 - Nelson, James
A2 - Maeda, Tatsuo
A2 - Vos, Paul
ER -