Authors : Bong-Young Kim, Eun-Young Yi and Myung-Jin Bae
Abstract: 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.
Bong-Young Kim, Eun-Young Yi and Myung-Jin Bae, 2019. A Study on the Distinguish of the Defective Product of Ceramic Toilet by Sound Characteristics. Journal of Engineering and Applied Sciences, 14: 1247-1252.