Ki-Beom Kwon
KITECH
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Ki-Beom Kwon.
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.
Transactions of The Korean Society of Mechanical Engineers A | 2011
Dae-Young Shin; Ki-Beom Kwon
In this study, a simulation model developed for a hydraulic breaker is verified through comparison of simulation results to the experimental results. For performance optimization, the design parameters are selected based on the physical parameters of the equipment for ease of modification. Also a factorial experiment and regression analysis were conducted to observe the effect of each parameter on the performance of the hydraulic breaker. As a result, a method for optimizing the performance of a hydraulic breaker is proposed.
Transactions of The Korean Society of Mechanical Engineers A | 2011
Ki-Beom Kwon; Dea-Young Shin
In this study, a hydraulic system of a mini-loader is modeled, and the model is validated by comparing the simulation results to the experimental results. A load force acting on the structure of the mini-loader is obtained from the simulation of the hydraulic system, and the structural analysis via finite element method is performed using the obtained load force to evaluate the structural safety of the loader. For the mainframe that requires additional strengthening according to the structural analysis, the optimum design parameters are proposed using the design of experiments to improve strength without additional mass.
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.
Transactions of The Korean Society of Mechanical Engineers A | 2012
Jeong-Sam Han; Ki-Beom Kwon
The transient analysis for the output voltage of a piezoresistive microaccelerometer takes a relatively high computation time because at least two iterations are required to calculate the piezoresistive-structural coupled response at each time step. In this study, the high computational cost for calculating the transient output voltage is considerably reduced by an approach integrating the mode superposition method and the least square method. In the approach, data on static displacement and output voltage calculated by piezoresistive-structural coupled simulation for three acceleration inputs are used to develop a quadratic regression model, relating the output voltage to the displacement at a certain observation point. The transient output voltage is then approximated by a regression model using the displacement response cheaply calculated by the mode superposition method. A high-impact microaccelerometer subject to several types of acceleration inputs such as 100,000 G shock, sine, step, and square pulses are adopted as a numerical example to represent the efficiency and accuracy of the suggested approach.
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
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
ISRM Regional Symposium - 7th Asian Rock Mechanics Symposium | 2012
Chang-Heon Song; Ki-Beom Kwon; Jin-Yeong Park; Dae-Yeong Shin; Jung-Woo Cho