호남고속철도 400km/h급 증속구간에서의 터널 미기압파 현장시험

1 2015 KSR2015S118 400km/h Field tests of speed up to 400km/h for tunnel micro-pressure waves in Honam high-speed railway * , **, *, ** Dong-Hyeon Kim* , Minho Kwak**, Jung Hyun Park*, Bu-Byoung Kang** Abstract Field tests are performed to measure micro-pressure waves for HEMU-430X and KTX-Honam at the tunnel exit of the test-bed in Honam high-speed railway where tests at 400km/h are available. Two tunnels are installed at the booster region of the test bed. Each length is 550m and 323m respectively and both tunnels are comparatively short.

2 The 34o slanted portals are constructed at both entrance and exit of the 550m tunnel whereas the 34o slanted portal at the exit and the tunnel hood at the entrance of 323m tunnel for the reduction of the micro-pressure wave. In this study, micro-pressure waves at the tunnel exit are measured with a maximum speed of 405km/h and the performances of the tunnel entrance hood are verified for the first time in Korea. Keywords : Tunnel, Micro pressure wave, Hood, Aerodynamics, Test-Bed 3 .. 400km/h TEST-BED HEMU-430X , KTX.

3 TEST-BED 2 550m, 323m , 550m 34o 323m 34o . 2 405km/h . : , , , , 1.. * : * ** ** (micro pressure wave, sonic boom) (Fig. 1 ). [1]. , 20Hz~100Hz.

4 1975 , 2005 [1-4]. , , . 1km . , [1].. HEMU-430X KTX-II(KTX- ) 405km/h . [5-7] . Fig. 1 The generation process of micro pressure wave at tunnel Ta b l e . 1 Main specifications of tunnels Tunnel Length* Cross sectional Area Tunnel entrance Tunnel exit Hoeryong 550m 34o-inclined portal 34o-inclined portal Woosan 323m Air-shafts hood 34o-inclined portal Ta b l e.

5 2 Sensor characteristics for measuring micro-pressure wave at tunnel exit Sensor Available Frequency range Measuring range Characteristics of very low Frequency band Rion NL-62 1 Hz ~ 20kHz 130dB Not good Rion NA-18 ~ 1kHz 150dB Good Setra 239 Over 0 Hz 500Pa Very good 2. Fig. 2 Measuring positions at the tunnel exits in Honam high-speed line 400km/h TEST-BED Fig. 2 , Fig. 3 HEMU-430X KTX-II . Table.

6 1 . 550m 323m . 300km/h (107m2) . Fig. 4(a) 34o ( 13m) , 45o 11o . ( 24m) Fig. 4(b) , 34o . Fig. 2 20m (Rail Level) . 20m [8,9]. Table. 2 RION NA-18 SETRA 239 . SETRA 239 RION XN-12 , Ozawa [1].

7 RION NA-18 RION XN-12 , NA-18 RION XN-1J . SETRA 239 ( ) . Fig. 2 Keyence 500 s LED ( : LV-H67, LV-21A Amp, PZ-G41) , 4 Rion DA-20 2,560Hz . 3. ( / ) . 400km/h Test-Bed - ( ).

8 HEMU-430X KTX-II 169km/h 405km/h 2014 12 3 ~ 2015 3 15 . (a) 34o slanted portal at the Heoyong Tunnel (b) Air-shafts hood at the Woosan Tunnel Fig. 4 Tunnels studied for the aerodynamic field tests (a) Train entry speed, 178km/h (b) Train entry speed, 403km/h Fig. 5 Micro pressure waves at the Hoeryong tunnel by HEMU-430X train in field tests (a) HEMU-430X train (b) KTX-II train Fig. 3 Trains studied for the aerodynamic field tests in tunnels HEMU-430X 20m Fig.

9 5 , (Setra 239 ). (a) Train entry speed, 189km/h (b) Train entry speed, 315km/h Fig. 6 Frequency Characteristics of micro pressure waves by KTX-II train for Hoeryong Tunnel in field tests (a) Train entry speed, 168km/h (b) Train entry speed, 342km/h (c) Train entry speed, 403km/h (d) Train entry speed, 405km/h Fig. 7 Frequency characteristics of micro pressure waves by HEMU-430X train for Hoeryong and Woosan Tunnels in field tests -2000 KTX- (KTX-II) Hemu-430X Fig.

10 6 Fig 7 500m 15Hz 100dB . 0Hz ~ . DB [10] 350km/h KTX-II . (550m) 20m Hemu-430X Fig. 10 342km/h 51Pa . 20m 50Pa 342km/h . KTX-II 10m2 Hemu-430X . 3 [1,2]. (a) Air-shafts hood model at tunnel entrance (b) Decrease of micro pressure wave Fig.