Jihoon Yoo
Seoul National University
About the Lab
Professor Jihoon Yoo's research lab specializes in mechatronic systems and intelligent control for agricultural machinery, focusing on active vibration control, precision agricultural equipment, and advanced hydraulic servo systems. The lab develops innovative solutions such as active seat suspension systems, adaptive tire pressure control, and smart fertilizer application systems using real-time feedback and optimized PID control algorithms. Research integrates simulation (MATLAB/Simulink), hardware prototyping, and field validation to enhance operator comfort, equipment efficiency, and operational accuracy in dynamic farming environments.
Research Overview
Research Output Trend
Figures are computed from collected data and may differ slightly.
Selected Papers
5This study was performed to develop an active tire pressure control system that can adjust tire pressure to the optimum level according to traveling and working condition of agricultural tractor. For the development of active tire pressure control system, pneumatic supplier, solenoid valve block including pneumatic supply line, infinite rotation type pneumatic supplier with rotary joint unit, tire pressure transceiver module and control algorithm were developed. Also, tire simulator was develope
The purpose of this paper was to design an effective control system of 1-axis exciter for a seat vibration test of agricultural tractors using MATLAB simulation. The developed simulation model was composed with a hydraulic pump, a hydraulic servo valve, a hydraulic cylinder and load system. Also it was verified by comparing the simulation results with experimental results of actual control system in order to optimize the control performance. And in order to improve its control performance, the d
Various types of vibration are transmitted to operators of agricultural tractors while working in the field. Most harmful vibration to human body is ride vibrations with low frequency ranging from 1 to 10 Hz, caused by rough terrain. These ride vibration has vertical and rotational components. This study was conducted to develop an active seat suspension system with two degrees of freedoms, enabling effectively reduce vibrations in vertical and pitch motions. Therefore, a mechanism for the activ
본 연구는 현재 개발된 입제 변량 제어시스템의 성능 개선을 위해 수행되었으며 그 결과는 다음과 같다. 기존 변량 제어시스템의 구성과 원리를 이론적으로 구명하였다.PID 제어를 이용한 시뮬레이션 모델을 Matlab/Simulink를 사용하여 개발하였으며 이 모델을 이용하여 2차 학습 제어 알고리즘을 사용하여 비례, 적분, 미분 제어상수를 자동으로 결정하는 프로그램을 작성하였다.결정된 비례, 적분, 미분제어상수로 시뮬레이션 모델을 이용하여 단위계단 응답을 예측한 결과, 최대오버슈트 1.97%, 상승시간 0.052초, 정착시간 0.066초, 정상상태오차 0.21%등 양호한 제어 성능을 얻었다.현장 실험을 통해 시뮬레이션 모델을 검증한 결과, 외란 및 부하로 인해 시뮬레이션 결과와는 달리 최대오버슈트 10%, 상승시간 0.11초, 정착시간 0.4초, 정상상태오차 8%로서 차이를 나타내었으나 기존 제어시스템의 성능과 비교할 때 상승 시간과 정착시간은 약 1/3로 크게 감소하는 제어성능의 향상
본 연구에서는 설계된 입제 변량살포 제어기의 입제 배출 장치의 회전속도 특성 및 입제 변량 살포 제어기의 입제 배출 성능을 분석하고 그 특성을 구명하고자 하였으며, 최종적으로 설계된 입제 변량살포 제어기의 응답 성능 분석에 초점을 맞추어 연구를 수행하였다. 주요 연구결과는 다음과 같다.
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