Chang-Heon Song
KITECH
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Chang-Heon Song.
Journal of Korean Society for Rock Mechanics | 2013
Ki-Beom Kwon; Chang-Heon Song; Jin-Young Park; Dae-Young Shin; Jung-Woo Cho; Sang-Ho Cho
The percussion rate and spacing of the button of drill bit are very important in maximizing the drilling efficiency. Therefore, a series of percussion tests using Hopkinson bar system was carried out to assess the fragmentation performance against the beat rate and spacing of a drill bit. First, single percussion test complemented with numerical simulation was performed to analyze rock fragmentation phenomenon and to describe the fragmentation process. Next, multiple percussion test that repetitively strike the rock sample moving at predetermined rate was carried out to predict drilling efficiency against the button spacing. After the tests, the fragmented volume of the rock was measured by laser scanner and the drilling performance was analyzed using the calculated percussive energy and measured negative volume. Based on the results, the single impact performance of drill bit with 102 mm diameter was predicted.
Journal of Korean Society for Rock Mechanics | 2012
Chang-Heon Song; Ki-Beom Kwon; Jin-Young Park; Dae-Young Shin; Jung-Woo Cho
In this study, a series of CFD (Computational Fluid Dynamics) simulations carried out to evaluate the optimum design model of the internal flow path of drill bit. The Star-CCM+ code was adopted to simulate the multi-phase discharge flow of rock particles and flushing air during a drilling process. The input parameters for the flow simulation of rock particles and air were obtained from the in-situ drilling test results. After the three design factors were determined, the experimental design method (Taguchi method) was utilized to evaluate the optimum value of each factor.
International Journal of Precision Engineering and Manufacturing | 2014
Chang-Heon Song; Ki-Beom Kwon; Jin-Young Park; Joo-Young Oh; Shinok Lee; Dae-Young Shin; Jung-Woo Cho
International Journal of Precision Engineering and Manufacturing | 2014
Ki-Beom Kwon; Chang-Heon Song; Jin-Young Park; Joo-Young Oh; Jae-Wook Lee; Jung-Woo Cho
International Journal of Precision Engineering and Manufacturing | 2015
Chang-Heon Song; Ki-Beom Kwon; Min-Gi Cho; Joo-Young Oh; Dae-Young Shin; Jung-Woo Cho
International Journal of Precision Engineering and Manufacturing | 2015
Chang-Heon Song; Min-Gi Cho; Jin-Young Park; Jae-Wook Lee; Myeong-Sik Jeong; Jung-Woo Cho; Sunghoon Ryu
International Journal of Precision Engineering and Manufacturing | 2016
Joo-Young Oh; Chang-Heon Song; Daeji Kim; Jeong-Gil Kim; Jin-Young Park; Jung-Woo Cho
International Journal of Precision Engineering and Manufacturing | 2015
Chang-Heon Song; Min-Gi Cho; Jin-Young Park; Jae-Wook Lee; Jung-Woo Cho; Hang-Seok Jang; Jintai Chung
International Journal of Precision Engineering and Manufacturing | 2015
Sunghoon Ryu; Jung-Woo Cho; Jin-Young Park; Jae-Wook Lee; Myeong-Sik Jeong; Chang-Heon Song; Jung-Gyu Kim; Jae-Joon Song
Archive | 2014
조정우; Jung-Woo Cho; 신대영; Dae-Young Shin; 이재욱; Jae-Wook Lee; 오주영; Jooyoung Oh; 박진영; Jin-Young Park; 권기범; Ki-Beom Kwon; 송창헌; Chang-Heon Song