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Performance simulation of an electric multipurpose cultivator according to rotary tillage
백승윤,김완수,백승민,전현호,이준호,이대현,최규홍,김용주,최승묵 충남대학교 농업과학연구소 2021 Korean Journal of Agricultural Science Vol.48 No.4
This study aims to evaluate the performance of an electric multi-purpose cultivator through a simulation analysis. The simulation model was developed using commercial software, Simulation X, by applying the specifications of certain parts, such as an electric motor, a battery, and so on. The input parameter of the simulation was the engine load data according to the rotary tillage level using a conventional multi-purpose cultivator. The data were collected by configuring a load measurement system, and the load cycle was developed by repeating the data collection process under the most severe conditions. The average output engine torque values of conventional multi-purpose cultivator were 10.7, 13.0, 9.4, and 11.2 Nm in the D1P1, D1P2, D2P1, and D2P2 conditions, respectively. As a result of the simulation, the maximum values of the motor torque, rotational speed, and power of the electric multipurpose cultivator were 16.8 Nm, 2,033.3 rpm, and 3.3 kW, respectively, and the motor was driven in sections within 70, 68, and 45% of the maximum output range. The rate of decrease of the battery state of charge (SOC) level per minute was approximately 0.6%, and it was possible to supply electric power to the motor for 9,550 sec. In the future study, research to verify and improve simulation models of electric multi-purpose cultivators should be conducted.
다양한 작동 조건에서 환경제어장치용 공기 사이클 냉각 시스템의 성능 평가
백승윤,김경수,안성민,권세진 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.4
본 논문에서는 램 공기로 구동하는 공기 사이클 냉각 시스템의 성능 시험평가 내용을 소개한다. 역브레이튼 사이클로 구동되는 공기 사이클 기계는 구심 터빈, 원심 압축기, 에어포일 베어링 등으로 구성된다. 이 시스템은 마하 수 0.3 ~ 0.8, 고도 0 ~ 9,000 m 의 비행 조건에서 열 교환기를 통해 2kW 이상의 냉동 용량을 공급하도록 설계되었다. ACM 의 성능은 간접적 방법에 의해 다양한 비행조건에서 실험적으로 평가한다. 시험 평가는 지상 시험 설비에서 ACM 의 입구 조건 및 가열기의 열량을 변화시켜서 수행하였다. 고도 성능의 예측은 지상 시험 데이터에 기초하여 차원 해석과 상사에 의해 추정하는 방법을 이용한다. 시험 결과로부터 개발 대상 ACM 은 설계 조건에서 2 kW 이상의 냉동 용량을 가지며, 주어진 고온 조건에서 전 시험 영역에 걸쳐 적절한 냉각 성능을 제공한다. In this paper, an introduction to the performance test of air cycle cooling system driven by captured ram air. The air cycle machine operating on a reverse bootstrap cycle consists of a radial turbine, a centrifugal compressor and air foil bearings. The system is designed to provide cooling capacity over 2 kW through heat exchanger in the flight condition of Mach 0.3 to 0.8 and 0 to 9,000 m altitude. The performance of the ACM is evaluated experimentally in a variety of flight conditions, by indirect method. Test and evaluation was carried out in a ground test facility by changing inlet conditions of the ACM and heat load of the heater. The altitude performance is estimated by dimensional analysis and similarity based on the ground test data. From the experimental results ACM has cooling capacity of over 2 kW in the design condition, and the developed ACM offers acceptable cooling performance in the whole test range at the given hot day condition.
농작업 부하데이터를 활용한 44 kW급 전기구동 트랙터의 E-driving 시스템 설계 검증
백승윤,백승민,전현호,이준호,김완수,김용주 사단법인 유공압건설기계학회 2022 드라이브·컨트롤 Vol.19 No.4
The aim of this study was to verify an E-driving system of a 44 kW-class electric tractor using agricultural workload data. Workload data were acquired during field test (plow tillage, rotary tillage, loader operation, field driving, asphalt driving) using a conventional tractor with a load measurement system. These workload data were converted to data of a 44 kW-class tractor based on the load factor of the engine. These data were used to verify the design of the E-driving system of an electric tractor. High-load operations such as plow tillage, rotary tillage, and loader operation could be performed at stage L and stage M. High-speed operation (asphalt driving) could be effectively performed at stage H using a rated rotational speed of the motor. As a result, the E-driving system of the electric tractor was possible to perform all major agricultural operations according to gear stages of range shift. Based on results of this research, we plan to develop an electric tractor equipped with an E-driving system and conduct research on actual vehicle verification in the future.
전투기 Cockpit용 ACM 개발 및 컴포넌트 성능시험
백승윤,노영철,조재필,김성돈,오원규,안성민,권세진 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.4
본 논문에서는 전투기 환경제어장치에 적용되는 ACM 의 개발 과정을 소개한다. 개발 대상 ACM 은 엔진 블리드 공기를 에너지원으로 하는 소형 터보기기로서, 역 브레이튼 공기사이클로 작동하고 Cockpit 의 냉동/공조에 사용된다. ACM 의 냉각 성능은 구성요소인 압축기와 터빈의 효율 수준에 의해서 결정 되므로 압축기와 터빈은 고효율 성능이 요구된다. 압축기와 터빈의 설계 및 제작을 완료하였으며 단품 단계에서 압축기 컴포넌트의 성능시험을 수행하여 설계 요구조건을 만족함을 확인하였다. In this paper, an introduction to the development of ACM designed for environmental control system of a fighter is presented. ACM is a small turbo machine operated on the reverse brayton air cycle, where bleed air of an aircraft engine is the source of driving energy and it can be used as cooling and air conditioning through cockpit of aircraft. A cooling performance of ACM is determined by component efficiency level, so high-efficiency performance of the compressor and turbine is required. Design and fabrication of compressor and turbine was completed, and the performance test have verified that the developed compressor meet the design requirements.