1. 서 론
,
. (Net)
wire rod
. Net
,
.
.
,
.
(1,2)
,
.(3,4)
학술논문
< > DOI:10.3795/KSME-A.2009.33.11.1262
네트공법 슬라브의 소음 및 진동 해석
김영우 ․ 강기준* ․ 정준오**
(2009 6 29 , 2009 10 19 , 2009 10 19 )
Noise and Vibration Analysis for Net Form Slabs
Young-Woo Kim, Kijun Kang and Junoh Jung
Key Words: Slab( 슬라브 ), Vibration( 진동 ), Noise( 소음 ), Numerical Method( 수치해석 )
Abstract
The slab(flat) truss plate used for building construction is analyzed for vibration and noise. Using floor impact test and numerical method (FEM), both net form and traditional form are compared for vibration and noise. The results show that the frequencies of a net form are lower than those of a traditional form in the case of free vibration, and the noise values of a net form are lower than those of a traditional form for the range from 500 Hz to 2000 Hz.
이 논문은
[ 대한기계학회 2009년도 충청지부 춘계학술 대회(2009. 5. 15., 대전컨벤션센터 발표논문임) ]
호서대학교 공과대학 자동차공학과 E-mail : [email protected]
TEL : (041)540-9683 FAX : (041)540-5818 호서대학교 공과대학 자동차공학과
*
호서대학교 공과대학 환경공학과
**
. Net
,
.
소음 및 진동 실험 2.
측정기기 및 공시체 제작 2.1
CEL- 231/254, Sound Level Meter
.
.
4
4 Net
. ,
Net 300 cm × 300 cm × 13 cm (
× × ) .
3 m × 3 m × 2.4 m (
× × ) .
2.2. 실험방법
(KS F 2810-1, 2)
(KS F 2863-1,
2) .
, 15 kg
.
4 . ( )
4 50 mm
(styrofoam) .
수치해석 방법 3.
FEM
ANSYS
. FEM
.
(5,6)
(7) (8)
FEM ANSYS
(9) (10) (11)
.
MIDAS/Gen
(3)
ANSYS .
FEM (boundary condition) X, Y, Z
2
Net (element) 1260, 9144
.
0 20 40 60 80
12.5 16 20 25 31.5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 10000 12500 16000 20000
Frequency (Hz)
dB
Traditional Form Net Form
Fig. 1 1/3 Octave Analysis of Traditional and Net Form
결과 분석 4.
연속 충격 분석 4.1
Fig. 1
, (rubber hammer)
.
500 2000 Hz 2 4 dB
Net 25 60%
. 250 400 Hz
63 80 Hz Net
.
, Net
.
단발 충격 분석 4.2
15 kg 10 cm
Net
. 10
cm 1 m 10
Table 1 . Fig. 2 10 cm 100
cm
. 40 cm
2 . 8 d B ,
Table 1 Measurement conditions
90 cm 0.4 dB Net
. Net
4 28%
(10 cm) (90 cm)
.
해석 프로그램 결과 분석 4.3 Computer
FEM 2
.
66.234 Hz Net
72.39 Hz .
Net
.
1.5 kg, 7.5 kg 15 kg
(1.5 kg)
.
0.002 sec 0.004 sec 0.1 sec
2 .
Net .
.
80 85 90 95 100 105
0 10 20 30 40 50 60 70 80 90 100 110
측정높이 (cm)
dB
Traditional Form Net Form
Fig. 2 Comparing with forms for noise
기존 공법의 두께 변화에 따른 고유 진동 4.4.
수의 변화
2
2 mm 140
mm FEM
.
, 140 mm
72.390 Hz , Net
130 mm 72.141 Hz
. 10
mm (140 mm) Net (130
mm) ,
Net 10 mm
.
5. 결 론
ANSYS
.
(1) Net
1/3 , 2
Net ,
50 Hz 13 dB
. Net
4 .
500 2000 Hz Net
, 4 dB
.
Net 60%
.
(2) , Net
. 40 cm
2.8 dB . Net
40 %
. 10 cm
0.4 dB 5 % .
(3) Computer
. 130 mm
Net
10 mm , Net
7 % .
참고문헌
(1) Lee, S. W., 2006, "A Study on the Dicisive Factors for Floor Impact Sound Performance in High-rise Residential Buildings," Journal of the Architectural Institute of Korea - Planning and Design, Vol. 22, No. 3, pp. 303~310.
(2) Shin, Y. S., Choi, H. B., Lee, U. K, Ann, S.
H. and Kang, K. I., 2006, "A Study on Selection of Slab Form Work System for High-rise Building Construction," Journal of the Architectural Institute of Korea - Structure and Construction, Vol. 22, No. 2, pp. 147~154.
(3) Kim, G. C. and Kim, K. M., 2007, "A Study on the Characteristics of Vibration and Impact Sound at the Hollow Slab," Journal of the Architectural Institute of Korea - Structure and Construction, Vol. 23, No. 4, pp. 59~69.
(4) Seo, J. R., Hwang, J. S., Song, J. G. and Kim, S. W., 2004, "An Experimental Study on the Noise and Vibration Reduction Effect Depending on Dynamic Property of Slab," Proceedings of Architectural Institute of Korea, Vol. 24, No. 1, pp. 161~164.
(5) Kim, Y. C., Ju, Y. K. and Kim, S. D., 2004,
"Finite Element Analysis on Structural Behaviour of Concrete-Filled Tube Column to Flat Plate Slab Joint," Journal of the Architectural Institute of Korea - Structure and Construction, Vol. 40, No.
8, pp. 3~10.
(6) Chung. J. A. and Choi, S. M., 2004, "Structural Behavior of H-Shaped Beam-to-square Tube Column Connection reinforced with Vertical Stiffeners," Journal of the Architectural Institute of Korea - Structure and Construction, Vol. 20, No.
4, pp. 59~66.
(7) Sun, R. J., Lim, J. S. and Jeong, J. H., 2008,
"Sensitivity Analysis of Load Transfer of Jointed Concrete Pavements Using 3-D Finite Element Model," Journal of the Korean Society of Road Engineers, Vol. 10, No. 1, pp. 145~157.
(8) Kim, T. J., Park, J. H. and Lee, U., 2003,
"Sound Radiation Characteristics of a Cracked Rectangular Vibrating Plate," Journal of the Korean Society for Railway, Vol. 6, No. 3, pp.
163~168.
(9) Choi, J. H., 2000, "Shape Sesign Sensitivity Analysis of Thermal Conduction Problems using Commercial Software ANSYS," Trans of the KSME A, Vol. 24, No. 3, pp. 645~652.
(10) Han. J. S., 2005, " Efficient Vibration Simulation Using Model Order Reduction," Trans of the KSME A, Vol. 30, No. 3, pp. 310~317.
