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3 74 ~ 51 m 10 ~ 00 m Details f the Reverberatin Rms used fr this Investigatin. Labratries Vlume (m ) Surface Area (m ) Flr Area (m ) Interir Finish Materials and unit size f Diffusing plate 1. Kbayashi Inst. f Phys. Res. (N. 1). Ty Univ.. Building Res. Inst. 4. Inst. f Sci. and Tech. Univ. f Tky 5. Nihn Univ. 6. Takenaka Tech. Res. Lab. 7. NHK Tech. Res. Lab. 8. Ykhama Natinal Univ. 9. Kajima Inst. f Cnst. Tech. 10. Nippn Asbests C. 11. Kbe Univ. 1. Kbayashi Inst. f Phys. Res. (N.) 1. Tky Inst. f Technlgy Plished cncrete Ceramic tile Plished cncrete Msaic tile Msaic tile Flr and Wall: Ceramic tile Celing: Mrtar Mrtar Painted Mrtar Wall and Celing: Mrtar Flr: Msaic tile Mrtar Cncrete painted Plished cncrete Mrtar painted (0.91m 1.8m) ( ) ( ) Asbests jint sheet (1..4) ( ) Plastic sheet ( ) Plastic sheet ( ) ( ) Asbests jint sheet (1. 1.) Asbests jint sheet (1. 1.) ( ) ( ) ( )

4 Diffusing Cnditins f Reverberatin Rm fr the rd Rund Rbin Test. Cnditin a b c d Cnditin 15. -I -II 4 (Ttal area f ne side f diffusers) (Flr area f rm) Area f Test Materials Area (m ) % Length Width ( Perimeter length) (m) (m) / (Area) kg / m Divisin f Test Scheme. Diffusing cnditin Area cnditin a b c d 15. -I -II 4, ( A) ( A,D), ( A), (A, D), ( A) ( A,D), (A) (A, D), (A) ( A,D) (A, D) (A) ( A, D) (A) (A) ( A) Grup : Rm, 4, 6, 1 : 9, 10, 11, 1 : 1,, 5, 7 : 8 (A): Measurement f Absrptin Cefficient (D): Measurement f Diffusitivity (A, D) (A) (A) T(s) 50 / T(dB / s) 0 ~ 60

5 0161. V 1 1 α = S T T V T 1 T 1 (m ) S (m ) (s) (s). Results f the rd rund rbin test Area cnditin: 1.5 Diffusing Cnditin: a. Results f the rd rund rbin test Area Cnditin: - I Diffusing Cnditin: a. Results f the rd rund rbin test Area Cnditin: Diffusing Cnditin: a. Results f the rd rund rbin test Area Cnditin: - II Diffusing Cnditin: a

6 ± 10%. Results f the rd rund rbin test Area Cnditin: 4 Diffusing Cnditin: a. Results f the rd rund rbin test Area Cnditin: - II Diffusing Cnditin: d. Results f the rd rund rbin test Area Cnditin: Diffusing Cnditin: d

7 1) 4) 157 m 10 5) 7) 8) 6). Directinal distributin f sund in a reverberatin rm measured in statinary (Lest) and transitinal (Right) state with varius numbers f diffusing plates. n : number f diffusing plate d : directinal diffusitivity de : elevatinal diffusitibity f the averages fr each elevatin angle energy R : rati f hrizntal t vertical mean 1 energy

8 d = m / m 1 e e e0 m = Μ / M, M = A / n, M = e e e e ei e e i= 1 i= 1 A M / n, n ei e e e A ei i ne ne. Directinal distributin f sund in a reverberatin rm measured in varius transitinal time after surce is stpped. t : transitinal time after surce is stpped number f diffusing plates : (Left) 7, (Right)0 A = I / p, I i j ei pi j = 1 ij i ij p i i m e0 m e n 10 ( i = 10, 0 ~ L90 ), e = p = 5, p = 6, p = 5, p = 4, p = 1, p = 8, p =, p = 18, p = 1, p = 6, p = (7.5 m ) cm 9.9 m R= E / E E, E V H E, E R, R R = E / E 1 H1 V1 E V 1 70 ~ 90 E H1 10 ~ 0 p [ j 80 k 90 l ] j= 1 k = 1 l= 1 / [ p + p + p ] E = I + I + I V 1 70 p 10 0 [ j 0k ] p E = I + I /( p + p ) H1 10 j= 1 k = 1 R = E / E H V p E V 90 E H 0 0 p V H 10 0 H V 1

9 E I V = 90 EH = ( I, + I, + I, I, + I, ) / R R 1 d e R 1 d 9) 157, 99m R R t = 0 R T T/ R. Variatin f the rati f hrizntal t vertical mean energy E E with the 0 / 90 time transitted after surce is stpped. n : number f diffusing plates frequency : 150 Hz

10 . Ratinf hrizntal t vertical mean energy E / E measured in varius psitins 0 90 in a reverberatin rm Reverberatin rm with a vlume f 99m, number f diffusing plates: 0 Reverberatin rm with a vlume f 157m, number f diffusing plates: 18 d e R 1 R α d e R 1 R α = d e α = lg R 10 1 α = lg R 10 R ± 10% field cnditin vlume f reverberatin rm number f diffusers surce a b c d e f g h i j 157m 99m 7 (10%) 18 ( 80%) 9 ( 40%) ( 1%) 0 ( 0%) 0 ( 0%) 14 (10%) 9 ( 80%) 5 ( 40%) 0 ( 0%) 5 cm speaker at the rm crner directinal speaker at the wall 5 cm speaker at the rm crner ttal area f diffusers ( ): 100(%) flr area test material : 5 cm thick glass fiber bard (.66.7 m) placed n the flr.

. Relatin between the elevatinal diffu - sitivity f the averages fr each elevatin angle energy d e and the measured absrptin

Area f test materials : 10.0m placed n the center f the flr.

a ~ j : field cnditins (Table 5) 10 m 157m, 99m 91 R R.

11 . Relatin between the elevatinal diffu - sitivity f the averages fr each elevatin angle energy d e and the measured absrptin cefficient α. a ~ g : field cnditins (Table 5) Fig. 1 ~ Fig. 14 Area f test materials : 7.5m placed n the whled flr. Area f test materials : 10.0m placed n the center f the flr.. Relatin between the rati f hri - zntal t vertical mean energy R α and the measured absrptin cefficient. a ~ j : field cnditins (Table 5) 10 m 157m, 99m 91 R R. Relatin between the rati f hri - zntal t vertical mean energy R 1α and the measured absrptin cefficient. a ~ g : field cnditins (Table 5) R 1 R d e. Variatin f the rati f hrizntal t vertical mean energy R with the = E / E 0 90 numbers f diffusing plates. Reverberatin Rm with a vlume f 157m Reverberatin Rm with a vlume f 99m

12 R 5 kg / m.66m 7. m. Rati f hrizntal t vertical mean energy R = E / E measured in different 0 90 reverberatin rm. 1 ~ 1 : Reference number f the reverberatin rm shwn in Table 1. R R 10m m ±10% ( ) R 10m 10m

75 unit: mm Fig. Structure of model three-phase stacked transformer cores (a) Alternate-lap joint (b) Step-lap joint 3 4)

75 unit: mm Fig. Structure of model three-phase stacked transformer cores (a) Alternate-lap joint (b) Step-lap joint 3 4) 3 * 35 (3), 7 Analysis of Local Magnetic Properties and Acoustic Noise in Three-Phase Stacked Transformer Core Model Masayoshi Ishida Kenichi Sadahiro Seiji Okabe 3.7 T 5 Hz..4 3 Synopsis: Methods of local