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Experimental Evaluation of Percussion Performance for Rock-Drill Drifter
Seo, Jaho,Park, Jin-Sun,Kim, Heungsub,Noh, Dae Kyung Korean Society for Agricultural Machinery 2015 바이오시스템공학 Vol.40 No.1
Purpose: The objective of this study was to understand the operating mechanism of the rock-drill drifter, to explain how to setup an experimental test system and measure the strain of the drifter's rod, and to evaluate the drifter's performance with respect to the impact energy and blow frequency. Methods: The structure of the rock-drill drifter and its operating principle regarding the impact process were analyzed. Static calibration was carried out to calculate the correction factor using a drifter rod as the first step of the experimental test. The impact energy and blow frequency were then calculated based on strain measurements of the drifter's rod. Results: Experimental results showed that the tested drifter elicited a blow frequency of 3330 BPM (Blows Per Minute) and generated impact energy of 170 J/blow. This indicates that the drifter elicits a higher percussion speed and results in a lower impact energy compared to the hydraulic breaker at the same input power. Conclusions: The study proposed methodologies that deal with the experimental setup and the evaluation of the performance of the rock-drill drifter. These methodologies can be extensively used for validating and improving the percussion performance of the drilling equipment.
SEO JAHO,노대경,이근호,장주섭 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.2
The drifter is one of the main components that play a significant role in the percussion capability of the rock drill. The authors of the paper identified the operating mechanism of the drifter and developed an analysis model for the purpose of improving the percussion capability of the rock drill. The authors of this paper also validated the reliability of the analysis model through a comparative study between the analysis results and the results of the experimental tests and utilized the validation results to understand the main factors wielding effects on blow frequency and impact energy.
Development of Steering Control Algorithms with Self-tuning Fuzzy PID for All-terrain Cranes
Jaho Seo,Moohyun Cha,Kwangseok Oh,Young-Jun Park,Tae J. Kwon 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
The study deals with the design of control algorithms to enhance the steering performance of all-terrain cranes. For this, its hydraulic steering system was modeled using a multiphysics simulation tool and the self-tuning fuzzy PID controller was developed to control hydraulic steering actuators with nonlinearities. The designed control algorithm was validated through co-simulation using a real-time simulator and showed satisfactory performance.
Thermal Management in Laminated Die System
Seo, Jaho,Khajepour, Amir,Huissoon, Jan P. 제어로봇시스템학회 2014 Transaction on control, automation and systems eng Vol.12 No.4
The thermal control of a die is crucial for the development of high efficiency injection moulds. For an effective thermal management, this research provides a strategy to identify a thermal dynamic model and to design a controller. The neural network techniques and finite element analysis enable modeling to deal with various cycle-times for moulding process and uncertain dynamics of a die. Based on the system identification which is experimentally validated using a real system, controllers are designed using fuzzy-logic and self-tuning PID methods with backpropagation and radial basis function neural networks to tune control parameters. Through a comparative study, each controller's performance is verified in terms of response time and tracking accuracy under different moulding processes with multiple cycle-times.