TY  - JOUR
T1  - A Study on the Distinguish of the Defective Product of Ceramic Toilet by
Sound Characteristics
AU - Bae, Myung-Jin AU - Kim, Bong-Young AU - Yi, Eun-Young 
JO  - Journal of Engineering and Applied Sciences
VL  - 14
IS  - 4
SP  - 1247
EP  - 1252
PY  - 2019
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2019.1247.1252
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2019.1247.1252
KW  - Toilet
KW  -ceramic toilet
KW  -sound component
KW  -percussion inspection
KW  -hearing characteristic
KW  -defective
product
AB  - The most important function of the toilet is to drain the excrement without polluting the water supply.
The invention of a very sanitary ceramic toilet has revolutionized health hygiene. Since, ceramic toilet was first
introduced to Korea in 1958, it played an important role in developing public health hygiene. Ceramic toilets can
cause deformation and cracks in the manufacturing process. The ceramic toilet is very hard and its internal
structure is complicated. Due to the nature of the product, there is no proper inspection method to check the
internal condition. The inspector identifies the failure of the ceramic toilet through percussion inspection. When
a ceramic toilet is tapped with a wooden hammer, a sound is produced according to the characteristics of the
product. In the case of a defective product, the sound differs from the sound of the normal product memorized
by the inspector. In this study, we tried to check whether the badness can be distinguished by using sound
of each state of urinal. The normal products resonated at 650 Hz and 1 kHz with similar energy size while the
defective products showed different energy levels between resonance points or resonance points themselves.
In conclusion, the examiner memorizes the sound components of each part of the normal product and
distinguishes the difference of the fine sound components that occur when defective products are hit by the
hearing characteristic.
ER  -