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(1)
(2)
(3) (4) 20
(5) y =
-74.3x + 1483 (R2) 0.895
Abstract This study aimed at investigating the application of ultrasonic wave technology to the analysis of decay and void size inside wooden objects in historical sites. The feasibility of quantitative evaluation is also addressed. The evaluation results in this study can be used as a reference for historical site repair and structural safety evaluation. From the experimental results, we obtained the following conclusions: (1) If the object has a coating or color painting on its surface, or has a shiny surface and is round, then the
effective signal collected by the receiver is found to be a surface wave with a wave transmission path through the surface.
(2) If the inner damage status of the wooden object is to be known, some proper guide hole has to be drilled on the surface of the wooden object, or a nail has to be put into the wooden object in order to guide the ultrasonic wave into the inner part, such that more accurate and effective information can be collected at the receiver end.
(3) If the probe head on the receiver end and emitter end cannot be held horizontally or stably, the information acquired will be less accurate.
(4) We can use a cone-shaped sound wave guiding iron pestle to drill a guide hole in a direction within 20 degrees to the horizontal axis. This method can be applied in a situation where the probe head cannot be held horizontally during the detection. The larger the void diameter inside the wooden object, the lower the transmission speed of the sound
wave is. This relationship can be represented by a linear regression equation. The equation is y = -74.3x + 1483, the correlation factor (R2) is 0.895. An obvious negative relationship can be observed.
Keywords: Wood-structured Historic Buildings, Ultrasonic Wave, Nondestructive Testing
Application of Ultrasonic Waves to the Quantitative Evaluation of Interior Decay in Wooden Historical Buildings
Liao, Chih-Chung
/ / / 77-84
077
1.
X
X
(Nondestructive Testing, NDT)
“ ”
2.
1
2
340
4000~5000 m/s 1200~1800 m/s
(1)(2)
V= � / t (1)
E= V2 * � (2)
V (m/sec) � (m) t (sec) E (Pa) � (kg/m3)
(1)
Journal of Cultural Property Conservation/Vol.1(1)/pp. 77-84
078
2.
3.
3. 3.1.
(Cunninghamia lanceolata)0.97cm 0.43 0.37
17.6 %
3.2.
2060
2cm 4cm 6cm 8cm 10cm12cm 14cm 3
PEG25°C 65%
15%
3.3. C.B.S
Sylvatest-Duo
3.4. (1) 25°C
65% 15% (2) ( )
4(a bc d)
5
4. 4.1.
Sylvatest-Duo
/ / / 77-84
079
22 kHZ
6 120cm
7
22MHz
0.3cm 0.3cm
0.5cm
(1992)
2
9( 3) 3
9y = -1.0005x + 96.692 2
0.918
Journal of Cultural Property Conservation/Vol.1(1)/pp. 77-84
080
7.
8. ( )
4.2
30cm
(1997)(30° 45° 60°)
(2cm 5cm)
(1996)
30°~50°
10
1120° 2.5mm
4.3.
2.5mm( 2~3cm) 12
4.4
/ / / 77-84
081
5
(1)
(2)
(3)
(4) 20°
(5)
y = -74.3x + 1483 R2 0.895
(6)
y = -1.0005x + 96.692 R2 0.9188
[1] 2000
,
[2] 1984 ( ), 150
1-23
[3] 1997( ) 16 4 681-696
[4] 1997,
[5] 1998
26
[6] 1997 ( )16 2
300-313
[7] 1996( ) 15
3 415-424
[8] 1995
6-10
[9] 1995
37-66
[10] 1989
[11] 200248
1 1-6
[12] 198641 8 370-374
[13] Gerhards,C.C., 1975, Strss wave speed and MOE of Sweetgum ranging from 150 to 15 percent MC Forest Pord.J., Vol.25, No.4, pp.51-57.
12.
Journal of Cultural Property Conservation/Vol.1(1)/pp. 77-84
082
[14] Smulski, S. J., 1991, Relationship of stress wave and static bending determined properties of four northeastern hardwood. Wood and Fiber Sci., Vol.23, No.1, pp.44-47.
Liao, Chih-Chung
Assistant Professor, Department of Cultural Heritage Conservation , National Yunlin University of Science Technology Douliou, Yunlin, Taiwan, R.O.C. � [email protected]
/ / / 77-84
083
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