-
RISS 활용도 분석
-
일본/중국/유럽자료
-
최신/인기 학술자료
-
해외논문구매대행(E-DDS)
http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 민영봉 (검색결과 131 건) 검색분석정보 보기
- 무료
- 기관 내 무료
- 유료
-
閔泳鳳 慶尙大學校 1989 論文集 Vol.28 No.2
Speed control of the engine by centrifugal weight type governor(CWG) is not adequate for maintaining the constant speed under the condition of load variation. To solve this problem, recently the digital control systems are used. But most of the digital control systems are usually not suitable for the agricultural engine speed control because of non-linearity and time-variant elements. To adapt well to the circumstances with these problems, the model reference adaptive control system(MRACS) was developed and tested. And the performance of MRACS was compared to that of PID and CWG. The control and measuring equipments were a 5.5 PS gasoline engine, a STD bus system with Z80 microprocessor and a dynamometer. The test results were summarized follows : 1. Under the step input of the reference speed, the controlled responses at transient and steady state were good in the order of MRACS ,PID and CWG . 2. Under the step input of the brake torque, the engine speeds controlled by MRACS and PID were maintained at the reference speed constantly but the one by CWG was dropped in proportion to magnitude of the brake torque. 3. In the frequency response test, the speed fluctuations by MRACS and PID were larger than that by CWG only within the frequency range of 0.1 -1.5 Hz of the brake torgue. 4. To improve the control performances of MRACS, a more accurate equation suitable for the controlled process should be established, a shorter period of control should be taken. the non-linearity of the carburettor should be ruduced and the engine speed should be measured consistently.
-
마이크로 컴퓨터를 이용(利用)한 엔진회전속도(回轉速度) 제어(制御)에 관한 연구(硏究)
민영봉,이기명,Min, Y.B.,Lee, K.M. 한국농업기계학회 1986 바이오시스템공학 Vol.11 No.1
Speed control of kerosene engine by the combination of a manual throttle and centrifugal weight type governor is not adequate for evaluating energy requirements in laboratory and field performance tests. This paper describes an engine speed control system. This system consists of Apple-II microcomputer, step motor set to the throttle shaft directly, step motor driving and interfacing circuit, engine performance data acquisition system for measuring load, speed and time and potentiometer as speed adjustor. The performance of this system was successful in maintaining engine speed within ${\pm}37$ rpm of reference speed indicated by computer and potentiometer.
-
-
-
-
-
-
-
-
양파 플러그 묘 밀어내기식 취출장치의 최적 작업조건 구명
민영봉,한철우,권기영 경상대학교 농업생명과학연구원 2014 농업생명과학연구 Vol.48 No.6
This study investigated the performance of push-out and transplanting for onion plugseedlings under various conditions with elapsed day after seeding, soil moisture, a pindiameter of a push-out device, elapsed day after last irrigation, push-out resistant, and rootbreakage percentages. The soil moisture in the nursery box appeared mostly evaporated aftertwo days from the last irrigation. A push-out device was developed in order to measurepush-out resistant of onion plug seedlings. The results showed that the resistant became lageras pin diameter was larger and elapsed days after irrigation were longer. The percentage ofroot breakage was measured and the overall tendency showed that the root damage decreasedas the seedling nursery period got longer and the period after last watering got shorter. With an onion transplanting test equipment, planting success rates were measured. The success rates appeared depending on root breakage conditions of the seedling. When the percentage of theroot breakage exceeded more than 40%, the rate got lowered as the planting speed increased. Furthermore, when the breakage percentage exceeded more than 70%, the planting success ratewas lower than 50%. 본 연구에서는 육묘일수, 수분정도, 모종밀대의 핀경, 최종 관수 후 경과일수, 모종 취출저항, 뿌리부상토 파손정도에 따른 모종 취출 저항 및 정식작업 성공율을 조사하였다. 모종 뿌리부 상토 수분은 뿌리부의 성장정도에 따라 수분을 가지고 있는 기간이 늘어나는데, HN 상토의 경우 육묘일수 45-55일,T형 상토는 50-60일 일 때 수분함유량이 높았다. 양파모종 취출 시험장치를 개발하여 취출저항을 측정하였는데 취출저항은 핀경이 클수록, 육묘일수가 적고 최종관수 후 경과일수가 많이 지났을수록 커지는것으로 나타났다. 핀이 모종을 취출할 때 묘판을 같이 밀게 되는데 이때 핀경이 클수록 묘판의 많은 면적을 밀게 됨으로써 취출저항이 커지는 것으로 판단된다. 육묘일수가 적은 경우 뿌리부 상토에 양파 모종의 뿌리 부분이 적고 상토 부분이 많기 때문에 취출저항이 커지는 것으로 판단되었다. 최종관수 후경과일수는 수분이 증발하면서 모종 뿌리부 상토가 굳어짐에 따라 커지는 것으로 판단되었다. 모종 취출시 뿌리부 파손율은 육묘일수가 많을수록, 최종 관수 후 경과일수가 적을수록, T9 에서 키우는 것이낮은 것으로 나타났다. 정식성능 분석시험장치을 이용하여 모종 뿌리부 파손율에 따른 정식율을 조사한결과, 모종 뿌리부 파손율이 40%이상이고 정식속도가 높아질수록 정식율이 낮아지는 것으로 나타났으며 모종 뿌리부 파손율이 70% 이상일 경우 정식율이 50%이하로 나타났다.
KISS
