1) 2) 3) 250Hz 500Hz RESEARCH ON THE PHYSICAL VOLUME OF THE DYNAMIC VIBRATION RESPONSE AND THE REDUCTION OF THE FLOOR IMPACT SOUND LEVEL IN FLOORS OF RESIDENTIAL HOUSING Hideo WATANABE *1 This study was conducted in order to exhibit the appropriate floor finishing structures. First, the measurement of the dynamic vibration response characteristics and the sensuous estimation test for evaluating a sense of walking were both conducted by using the floor finishing structures in the residential houses. Then clarified the relation between the reduction of the light-weight floor impact sound, and either the dynamic vibration response physical volume or the sensuous evaluation volume. After that, the method was examined for estimating the reduction of the light-weight floor impact sound from the dynamic vibration response physical volume. At the same time, the floor in the residential house was evaluated from both of the reduction of the light-weight floor impact sound and the sensuous evaluation volume. The experimental results are as follows: 1) The regression equations were determined after comparatively well corresponding results were obtained from the reduction of the light-weight floor impact sound and the dynamic vibration response physical volume such as the dynamic displacement volume, the dynamic spring constant, the impact frequency, and the impact Impedance level. Then, using these equations, it was indicated that there was a possibility to estimate the reduction of the light-weight floor impact sound. 2) The relation between the dynamic vibration response characteristics and the sensuous estimation was made clarified and appropriate physical volume corresponding to the desirability in the floor finishing structure in the residential house were indicated. 3) The relation between the reduction of the light-weight floor impact sound and the sensuous evaluation volume was made clalified and was showed that the sensuous changes correspond most to the frequency at 250Hz and 500Hz. *1 *1 Technical Research Institute
-1-2 100Hz 21 60 1260 2.0 147.0 N/cm 2 20 34 60 60 *1
-3-4 -5-6 -6-8
60-9
-1-2 -3-11 5 10 5 N/m 8 10 5 N/m 8 10 5 N/m 1.2 1.6 10 6 N/m 1.0 10 6 N/m 10 20 40 60 10
-12 P1 P2 P3 P1 P2 P3P4 P5 P1 P2 P3 55mm P1' P2' P3' -13 60kg 0.5kg 4cm 80Hz 31 (N-1 N-6) B-1 B-4 H-1 H-2 F-1 F-9 L-40 60 F-2 (T-1 T-5) T-1 10mm (C-1 C- 5) 8mm 100 700N P1-14 200 300N 100 200N 300N
0 200N 300 700N 0 700N 3-15 0 200N 300 700N 0 700N -16 0.7 10 5 8.0 10 5 N/m H-2 3.0 10 5 N/m 7.9 10 7 N/m 1.7 10 5 N/m N-2 N-3 0 200N 300 700N 0 200N0.7 10 5 3.4 10 5 N/m 300N 700N -16 0 200N -16 1.0 1.5 2.0 T-4 T-3 T-5-17 2.0 4msec 10 5 N/m C-1 C-3 1.0 10 5 N/m C-4 C- 5 1 2mm 4 8msec -15
T-1 T-3 T- 5 2msec N-1 N-3 N-4 N-6 ( t) (fn 1/(2 t)) -5 30Hz 63Hz 1/1 125Hz 250Hz -18-6 ( 0.7 ) 2 1mm
-19 300 350N -20 55mm 25mm -21 100mm 100 200mm 300mm150mm -22 j( - k/ ) (rad/sec) (kg) k (N/m) fn -6dB/oct +6dB/oct -23 100Hz
30 60Hz 125Hz -6dB/oct 10Hz 0 700N 200Hz 125Hz B-1 B-4 20Hz 30Hz 63Hz H-1 150Hz 125Hz 250Hz T-2 T-4-6dB/ oct T-1 250Hz (T-3,T-5) (T1 T2 T4) -6dB/oct
26 10 SD -6 9 8 SD 9-24 9 9-25 5-26 5% 3,600mm 1,800mm
-721 65 2020 39 4040 59 60 60 3-8 26-27 -28-29 -30
-31 20 40 60 20 40 60 2040 60 2040 60-32
20 40 60 60-33 31.5Hz -9-10 1.2 1.4mm 31.5Hz 5.0 10.0 10 5 N/m F-4 F-5 F- 6 LL-50 60 LL-45 5.0 6.0 10 5 N/m 3.0 10 5 N/m
30mm 40mm 34mm 45mm 303mm 12mm 12mm 15mm 15mm 140mm 81.7m 2 910 3640mm JIS A 1440 (RION NA-27) 63Hz 4KHz 15 Leq -34 LL-40 LL-60 125Hz 250Hz LL-55 60 LL-50 LL-40 45 250Hz LL-55 60 5dBLL-50 10dB LL-40 45 15 20dB F-2 1KHz 5dB 125Hz 500Hz T-1 63Hz 250Hz 500Hz 10dB C-2 10mm 125Hz 250Hz
-11-36 -12-37 -15dB/oct -9dB/oct n fn (f) (f/fn) 63Hz 125Hz 10dB 250Hz 20dB -38-39 125Hz 500Hz 12dB/oct 15dB/oct f/fn 4 8 16dB 4.5 9 18dB f/fn -35 3 6 12dB 10dB/oct
fn -13 40-14
-41 44 500Hz
F-1 F-3 F-6 F-8 LL-40 LL-50 250Hz 10dB 500Hz 25dB 250Hz 15dB 500Hz 20dB 125Hz 5dB 250Hz 10dB 500Hz 25dB 125Hz 8dB 250Hz 20dB 500Hz 30dB 250Hz 15dB 500Hz 25dB 125Hz 5dB 250Hz 10dB 500Hz 25dB 5dB 125Hz 5dB 250Hz 10dB 500Hz 25dB 250Hz 500Hz 1) 2) 1.0 1.5mm 3.0 10 5 N/m 3) 1.2 1.4mm 5.0 10.0 10 5 N/m L L -50 60 4) 5.0 6.0 10 5 N/m 303mm 30mm 40mm 12mm 12mm 5) 6) 250Hz 500Hz 1) 477 (1995 11 ) 2) 483 (1966 5 ) 3) 504 1998 2 4) 511 1998 9