1/10. 10dB. Jacob (7)
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1 . (). () db (3) (4) (5)(6) Jacob (7) Hz db [m/s] W H L [m] [db] [%] [%] dB(A).7%.% Audi AG dB(A) dB(A) dB(A).%.5% Controller 3-D Traverse Unit Low-speed test section 5 5 6, Umax=3m/s,u'/Uo<.% Contraction nozzle 9: Sound absorber Semi-anehoic chamber Concrete wall Guide vane (Fixed) Screens (a) Nozzle Bluff body Screens Guide vane (Moved) Silencer SA H G Guide vane (Fixed) Settling chamber Silencer SA Contraction nozzle 9: A Fan 37kw Return duct High-speed test section Umax=5m/s,u'/Uo<.5% Control room F B Fan room E Silencer RA Sound absorber Flow meters Guide vane (Moved) Silencer RA C D (b) Potential core Shear layer Nozzle Potential core Flat plate Flat plate Bluff body Boundary layer /
2 3. 3. PIV(Particle Image Velocimetry) PTV(Particle Tracking Velocimetry) PIV () () 3 (8) (9) Prong φ. Ceramic Tube φ Pressure Holes φ.4..4 φ 4 () Steel Tube φ.6 (34.3) 54.8 (.) φ 7 /4inch Condenser Microphone () () (3) ( ) (3) () () Brass Chamber φ= Target Probe φ=5 ReferenceMicrophone φ=4 fr a fr = π V S ( δ + m) φ=3 φ=45 S δ a m.8 Speaker Unit G = log [( f / fr) ] + (ξf / fr ) 5 φ = tan / ξ( f / f ) ( f / f r r)
3 Gain [db] Re= =. Phase [deg] Re= =. - Frequency f [Hz] - Frequency [Hz] 6 7 () () Hz khz khz SN 4 ζ (3) r ξ = () λ π r f r π f r log = log db () λ a π db (4) 3/
4 (5)(6)(7) (8)(9) (8) Phased Array (9) Phased Array ()()() ()() cm khz, Phased Array 8 Phased Array B&K Müller-BBM NASA /4inch /4inch /4inch /inch /4 inch X (.7m) cm / khz / ( 3 ) / 5kHz 5kHz 8kHz 5kHz 3kHz 4kHz Nozzle Flow 5m/s Pantograph Microphones /
5 (3) Lighthill-Curle (4) α C LR ρ DLSt U 6 p( r) = (3) 6 a r P a D L r U St C LR p ( r) α C LR amρ DLSt U 6 rm =. (4) pm ( r) αm C m a m DmLmStm LR Um 6 r ρ m (4) SPLe = SPL m amρ U D Φ + log + 6log + log log + ρm m m m r r log (5) a U D Φm (5) ( 3) (5) (5) 6 Φ log = 5log(Re) (6) Φm 5 (5) 6 Dm U f = fm (7) D Um (7) A (3) Strouhal Number S t Square Cylinder (Norberg) Square Cylinder (Fujita et al.) Circular Cylinder (Norberg) Circular Cylinder (Gerrard) Circular Cylinder (Present Exp.) Circular Cylinder (Fujita et al.) Sub-critical Region Square Cylinder Reynolds Number Re R.M.S Lift Coefficient CLrm s.. Circular Cylinder (Norberg & Sunden) Circular Cylinder (Gerrard) Circular Cylinder (Present Exp.) Reynolds Number Re (6) (9) (3) 3 5/
6 A /-scale Model /6-scale Model Relative Noise Level [db(a)] PS:V=69.4,/ Scale Model, Measured by Normal Microphone at 6m from center of the wind / Model /6 Model -7 / Model /5 Model -8 /5-scale Model /3 Octave Band Center Frequency [Hz] (7) (U=75m/s) U=5m/s A A (7) (3) / 4. 7 () 7km 75m/s 8 8 () f*=.4 6.5k-4kHz (3) 6/
7 (3) (33) (34) Noise Level db(a) Overall Pantographs Wheel-rails Leading head Relative SPL [db(a)] km /h 4 Time -3 /3 O ctave band center frequency [H z] Lighthill N-S Lighthill Lighthill a xj xixj t ρ = T ij a ρ T ij Lighthill T ij = ρ uiuj + u x u x 3 u x i j k ( p a ρ) δij + µ + µδij (9) j i k u i p Lighthill (8) Curle Lighthill xi fi pa( x) = 4πax t f i = i n PdS S P a f i P n i Lighthill-Curle Lighthill-Curle D L Phillips (35) L c fi pa ( x) = LLc xi () 6πax4 t (8) 7/
8 P Lc C ( f ) = C( f ) dζ () Lc 3 Gij( f ) C( f ) = 4 Gi( f ) Gj( f ) ζ G ij (f) G i (4) D= 4 mm L=5 mm / mm Helmholtz 38 Hz 8.75 Hz 6.5 Hz () L c 5 Lighthill-Curle L c Fujita (36) Lighthill-Curle Lighthill-Curle ( ) Flow.375D Pressure Ports d= mm D=4 mm Z Z=5mm Y L=5 mm X Z=-5mm Pressure Port D=4 mm Microphone Amplifier / inch Microphone SPL (db) Curle's Equation Measurement Dimensionless frequency f* Re=4 4 U=5. m/s D=.4 m 9 Lighthill-Curle 8/
9 Y/D Peak Level[dB] Peak Level St Peak Level U 6 3. Reynolds Re number Re Strouhal St[-] number St Coherence Function C Dimensionless spanwize spacing X/D Re 5. Lighthill-Curle (37)(38) Coherent Output Power COP A,B C C B B A Coherent Output Power Lighthill-Curle 5mm X Z Y X Ps X/D=.5 7. Y/D= kHz (39) Re=4. 4 6dB 64dB X/D=.5. Y/D=±.4 (39) ( 4 ) LES (4) Re.5x5 3.x5 3.x5 3.5x5 3.7x5 4.x5 4.9x5 7.4x5.x6.x6.5x6.7x6.x X/D X/D 3 4 9/
10 db 5. () Kaji.S, 6th AIAA Aeroacoustic conference, AIAA Paper -Keynote, () (), 6 (996) (3) Nishimura, N., et al., 5th AIAA Aeroacoustic conference, AIAA Paper , (999) (4) Fujita, H., et al., Proc. INTER-NOISE93 (993), (5) Fujita, H., et al., Proc.INTER-NOSIE96 (996), 7 3 (6) 3, 5 (993), 58 6 (7) Jacob, M.C., et al., 6th AIAA Aeroacoustic conference, AIAA Paper -, () (8) 3, 3, (99), 6 65 (9) Toyoda, K., et al., Applied Scientific Research 53 (994), 37 48, () 3,,6-59 B (995), () Fujita,H., et al., 4 th AIAA/CEAS Aeroacoustic Conference, AIAA Paper (998) () Iida, A., et al., Proc. INTER-NOISE '94 (994), (3) Fujita, H., and Kovasznay, L.S.G., :AIAA, (974),6 (4) 3, 6-64B (996),46 467, (5) Takano, Y., JSME International Journal (C), 4(), (998), 46 5 (6) Takano, Y., et al., Proc. INTER-NOISE 9, (99), (7) Michel, U., et al. 4 th AIAA/CEAS Aeroacoustic Conference, AIAA Paper (998) (8) Nakamura, M., et al.. Brüel & Kjær Application Note (998) (9) Jaeger, S.M., et al., 6 th AIAA/CEAS Aeroacoustic Conference, AIAA Paper -937 () () Moritoh, Y. and Zenda, Y., Japanese Railway Eng., 3, (994),5 9 (), RRR.8, (),6 9 () Sagawa, A. and Matsuo, J., 6 th AIAA/CEAS Aeroacoustic Conference, AIAA Paper -3 () (3) Iida, A., et al., 6 th AIAA/CEAS Aeroacoustic Conference, AIAA Paper -, (), (4) Curle, N., Proc. Roy. Soc. London, A3, (955),55 54, (5) Iida, A., et al., Proc. FLUCOME 97 Vol., (997), 6 (6) Norberg, B.C., J.Wind.Engineering Industrial Aerodynamics, 49 (993) (7) Fujita, H., et al., 5 th AIAA/CEAS Aeroacoustic Conference, (999), 35 3 (8) Norberg, B.C., IUTAM Symposium Bluff-Body Wakes, Dynamics and Instabilities, (99), Pubrished by Springer-Verag. (9) Gerrard, J. H., J. Fluid Mech.,, (96), (3) Noberg B.C. and Sundén, J. Fluids and Structures, (987), (3) Lilley, G.M., 4 h AIAA/CEAS Aeroacoustic Conference, AIAA Paper (998) (3) SP-4 (999),9 (33) B (998), (34) B () (35) Phillips, O.M., J. Fluid Mech., -6 (956), (36) Fujita, H., et al., 6 th AIAA/CEAS Aeroacoustic Conference, AIAA Paper -, () (37), 4, B (994), 6 3 (38) Kato, C., et al., 6 th AIAA/CEAS Aeroacoustic Conference, AIAA Paper -94, () (39) Iida, A., et al., JSME International Jounal, (B) 4() (999), (4), Vol. 78 (),7 /
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