:

:

(Unpleasant Sound or Disagreeable Sound)OK 90 dB

250 km/hr 250 km/hr 3

()

32000 ~ 5000 Hz3000 ~ 4000 Hz40%

(1)(Rolling Noise)

(2)(Impact Noise)

(3)(Squeal Noise)

(4)(Aerodynamic Noise)

(5)(Noise from Bridge)

(6)

(7)()

(1)()10 ~ 20%10 d

(2)

(3)1000 Hz

(4)

5)20

(6)

(1)

(2)

(3)

(4)

1. (2003)

134PP.74~77

2.

(2007)PP.48~52

3. (2000)9PP. 22~24

(5)