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실외용 농기계의 전장 보호 설계 기법과 신뢰성 시험 평가 방법
임훈(Hoon Lim),윤병운(Byong Un Yun),방병주(Byoung Ju Bang) 대한전기학회 2021 전기학회논문지 P Vol.70 No.2
This paper introduces the protection design method for electronic units of the self-propelled harvester, which is an agricultural machine used for field farming, among outdoor agricultural machines, and a reliability test evaluation method for it. The field farming work environment is an outdoor off-road surface that is generally divided into a ridge and a furrow. These off-road surfaces are mixed with various factors such as boulders, grass, and puddles, so shocks are constantly transmitted to the electrical equipment during movement and work, and dust is generated and moisture such as raindrops can penetrate into the interior of the electronic units the probability is very high. Typical external environmental factors that adversely affect the electronic units installed on the harvester body when the outdoor agricultural machine moves or works are impact, dust, and water. Therefore, this study proposes in detail a design technique that protects electronic units from the external environmental factors mentioned above and a reliability test evaluation method that can verify it.
자주식 수확기의 전장품 내구 설계 기법과 신뢰성 시험 방법
임훈(Hoon Lim),서명국(Myoung Kook Seo),신희영(Hee Young Shin),윤병운(Byong Un Yun),방병주(Byoung Ju Bang) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
본 논문에서는 “임훈과 오현경 등(1~2)”의 연구 결과를 바탕으로 자주식 수확기의 내구 설계 기법에 대한 더 상세한 신뢰성 시험 및 평가 방법에 대해 제안한다. 충격, 먼지, 수분(빗방울 등)들로 인해 발생될 수 있는 PCB 기판 크렉, 전자부품 탈거, PCBA 소손 등의 사고를 사전에 방지하기 위해 전장품 보호 케이스 소재를 플라스틱에서 알루미늄으로 변경하고, 먼지나 수분의 침투를 막기 위해 방수 고무 링과 방수 커넥터 그리고 Hole 부분에 고무 패킹 등을 적용하였다. 또한 주제와 경화제를 사용한 몰딩 처리로 전장품을 외부 환경 요소 들로부터 보호하였다. 이러한 방법으로 전장품 내구 설계 기법을 정립하였고, 해당 전장품의 내구 신뢰성을 검증받기 위하여 충격 시험과 염수분무 시험을 진행하였다. 충격 시험은 KS C IEC 60068-2-27 과 ISO 16750-3을 근거로 하였고, 염수분무 시험은 KS C IEC 60068-2-11을 근거로 하였다. 충격 시험의 목적은 부품 및 기기에 발생하는 충격에 대한 내구성을 평가하는 시험으로 조건은 3 축 3 방향, 충격지속시간 6ms, 가속도 30G, 반정형파의 조건으로 시험하였다. 염수분무 시험의 목적은 금속 재료의 내식성 및 표면 부식 상태와 수분 침투에 대한 내구성을 평가하는 시험으로 조건은 염수농도 5%, 온도 35℃, 분무량 0.5~3 ㎖/8 ㎤, 시간 24hr의 조건으로 시험하였다. 두 가지 신뢰성 시험 결과 전장품에 이상 없음을 확인하였다. 향후에는 더 다양한 신뢰성 시험과 평가를 통해 전장품 내구성을 검증받고 향상하려고 한다. In this paper, we propose a more detailed reliability test and evaluation method for the durability design technique of self-propelled harvesters based on the research results of “Lim H and Oh H.K(1-2)”. In order to prevent accidents such as PCB cracking, removal of electronic parts, and PCBA damage that can be caused by shock, dust, and moisture (raindrops, etc.), the electronic component protective case is changed from plastic to aluminum, and prevents dust and moisture from occurring to prevent penetration, a waterproof rubber ring, a waterproof connector, and a rubber packing were applied to the hole. In addition, the electronic parts were protected from external environmental factors by molding treatment using the main ingredient and hardener. In this way, a durability design technique was established for electrical equipment, and impact tests and salt spray tests were conducted to verify the durability reliability of the electrical equipment. The impact test was based on KS C IEC 60068-2-27 and ISO 16750-3, and the salt spray test was based on KS C IEC 60068-2-11. The purpose of the impact test is to evaluate the durability against the impact that occurs in parts and devices conditions were tested under the conditions of 3-axis 3-direction, impact duration 6ms, acceleration 30G, and semi-square wave conditions. The purpose of the salt spray test is to evaluate the corrosion resistance of metal materials, the surface corrosion state, and the durability against moisture penetration the conditions are salt water concentration of 5%, temperature 35℃, spray volume 0.5~3 ㎖/80 ㎤, time 24hr tested. As a result of the two reliability tests, it was confirmed that there was no abnormality in the electrical equipment. In the future, we intend to verify and improve the durability of electrical equipment through more various reliability tests and evaluations.
진동 오차 보상 기법을 적용한 동적 환경에서도 강인한 땅속작물 수확기용 무게 측정 알고리즘 설계
임훈(Hoon Lim),서명국(Myoung-Kook Seo),주영훈(Young Hoon Joo),윤병운(Byong-Un Yun),방병주(Byoung-Ju Bang) 대한전기학회 2020 전기학회논문지 P Vol.69 No.1
In this paper, we propose a system for weighing and verifying the weight of the crop in a stable and robustly in the dynamic environment where vibrations are generated during the harvesting of the field. At present, the method of measuring the weight of the harvest using a mechanical crop harvester is very inefficient. So in order to design the controller to improve the current problem, we derived the formula to reduce the vibration during weight measurement, applied the appropriate algorithm, and verified the performance of the controller through various experiments. Through this study, we are going to develop intelligent underground crop harvesting machines, simplify the process of weight measurement work, and increase the overall efficiency and convenience of field farming.
변위차 두둑 추종 방식을 활용한 자주식 감자수확기용 조향 제어 시스템 개발
임훈(Hoon Lim),서명국(Myoung Kook Seo),신희영(Hee Young Shin),윤병운(Byong Un Yun),방병주(Byoung Ju Bang),주영훈(Young Hoon Joo) 대한전기학회 2021 전기학회논문지 Vol.70 No.1
This paper attempts to introduce the development contents of a steering control system using the displacement difference ridge tracking method of a self-propelled potato harvester. Currently, the self-propelled potato harvester is operated manually, and it is easy to automate because it performs repetitive and regular movements and operations in a regularized ridge area. Therefore, we studied a method that can control the steering so that it does not deviate from the path or invade the side ridge while following the center of the ridge being worked. As a result, the equation was established by Ackerman Steering Kinematics, developed a ridge detection sensor and algorithm, and the optimum steering gain value was obtained through an experiment to verify the performance. The purpose of this study is to increase the work efficiency and convenience of the self-propelled potato harvester used in field farming.