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자주식 양파정식기 슬라이딩 메쉬형 기어박스의 동력전달 해석
이슬람나피울 ( Md Nafiul Islam ),알리모하마드 ( Mohammod Ali ),키라가샤피크 ( Shafik Kiraga ),초두리밀론 ( Milon Chowdhury ),권행주 ( Haing-ju Kwon ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2021 한국농업기계학회 학술발표논문집 Vol.26 No.1
An appropriate gearbox selection is essential to avoid transmission losses and convey the engine power to the transplanter components efficiently. Therefore, the objective of this research was to simulate the power transmission of a self-propelled onion transplanter gearbox for calculating the power loss and efficiency. The automatic transplanter power transmission scheme consists of wheels, and dibbling mechanism, and picking mechanism. A computer-aided gear efficiency calculation software package was used to develop a three-dimensional simulation model for the automatic onion transplanter. A V-belt with pulley and nine gear stages sliding mesh type gearbox were used to transmit power from engine to wheel and other transplanter components. The last two gear sets were used as dibbling and picking mechanism gear shafts, respectively. The transmission load was measured at the input shaft of the gearbox, and the driving axle load was measured at the final drive shaft. The load measurements were made at three-speed levels. The input power of the gearbox was 1.7 kW, and the last stage of power (picking scheme) was found as 0.8 kW. The overall efficiency of this gearbox was found as 83.39%. The outcomes of the research would provide a significant reference for the development a power transmission scheme for efficient automatic onion transplanting.
카말라술 ( Kamal Rasool ),나피울이슬람 ( Md. Nafiul Islam ),모하마드알리 ( Mohammod Ali ),밀론초두리 ( Milon Chowdhury ),임승진 ( Seung-jin Lim ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2020 한국농업기계학회 학술발표논문집 Vol.25 No.2
The demand of the onion transplanter is increasing in Korea as mechanization rate of the transplantation is less than 2% ~ 5%. Seedling transplanting mechanism is the key component of onion transplanter. Therefore, kinematic analysis of transplanting mechanism is helpful to determine the operational efficiency and performance of the implement. The purpose of this study is to develope kinematic models and simulation analysis of three different transplanting mechanisms. Five bar transplanting mechanism with pushing type seedling extraction, five bar transplanting mechanism with pin type seedling extraction, and four bar transplanting mechanism with clamp type seedling extraction were considered and their motions were simulated using commercial software. Selection of the appropriate link combination was done by conducting five numbers of trials for each mechanism with different lengths of link bars. The simulated velocities and accelerations of the end effector for each mechanism in the ‘X’ and ‘Y’ directions for appropriate link combination were found as 0.3 m/sec, 0.5 m/sec, 0.36 m/sec, 0.73 m/sec, 1.29 m/sec. 1.27 m/sec and 3.9 m/sec2, 1.6 m/sec2, 4.5 m/sec2, 4.7 m/sec2, 7.34 m/sec2, 7.26 m/sec2 respectively. The maximum seedling extraction rates were found as 60, 60 and 30 seedlings per minute, respectively. The five bar transplanting mechanism with pushing type seedling extraction could be considered as appropriate picking mechanism for onion seedling transplantation at 60 rpm speed of the driving link.
모하마드알리 ( Mohammod Ali ),나피울이슬람 ( Md. Nafiul Islam ),카말라술 ( Kamal Rasool ),밀론초두리 ( Milon Chowdhury ),나딤알리칸 ( Nadeem Ali Khan ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2020 한국농업기계학회 학술발표논문집 Vol.25 No.2
Optimization of the power transmission parts is essential for the development of a multi-functional platform for an agricultural track vehicle. However, the goals of the study were to design the gears and to evaluate the power transmission efficiency using computational simulation methods. The 3D models of a 10, 20, 30, 40, 50T spiral bevel gear were generated using steel material SM45C, employing the commercial software. The power transmission efficiency was calculated varying the gear teeth number, face width, and motor speeds maintaining the electric vehicle powertrain directions. The gear modules of 2.2, 2.7, and 3.2 were used to design the selected gears following a 1:1 gear ratio. The power transmission efficiency of the introduced vehicle was simulated using 1000, 2000, 3000, and 4000 rpm speeds. The simulation results of a 3.2 mm module with 50T showed better performance with maximum power loss at a high rotational speed. The maximum power transmission efficiency was recorded to be 99.95% when adjusted for 4000 rpm rotational speed. The designed gears with 30 mm and 20 mm face width achieved 99.91% and 99.93% transmission efficiency, respectively. The software-based analysis of power transmission gears would provide guidelines for the optimal design of the introduced agricultural utility vehicle.
농업 4륜 전기 자동차 설계를 위한 환감 기어의 부하 분석
알리모하마드 ( Mohammod Ali ),이슬람나피울 ( Md. Nafiul Islam ),레자나심 ( Md Nasim Reza ),초두리밀론 ( Milon Chowdhury ),이슬람수마이야 ( Sumaiya Islam ),이현석 ( Hyun-seok Lee ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2021 한국농업기계학회 학술발표논문집 Vol.26 No.1
The load analysis of gears is a major challenge to ensure the reliability of the power transmission system of the all-wheel-drive electric vehicle. It is necessary to select the proper material and face width for design the reduction gears to avoid its failure during field operations. Therefore, this study aimed to investigate the suitable materials and dimensions, to evaluate the fatigue life regarding the level of damage. A field experiment was conducted on the off-road conditions following the driving speeds. A load (torque) measurement method was established to collect the torque data using torque sensors and data acquisition systems. A load duration distribution (LDD) method was used to analyze the torque data to examine the cyclic load characteristics. The Palmgren-Miner cumulative damage model was used to determine the fatigue damage level of the reduction gears. The hypothetic fatigue life was recorded up to 2500 hours that satisfied the actual service life of the agricultural vehicle. In order to the analyses, the steel material ‘SCr420H’ with a 5 mm face width gear was suitable for a 10-year vehicle service life. The results presented in this study can suggest the service life of a four-wheeled electric vehicle for agricultural use.
농업용 붐 분무기의 노즐 높이 및 분무 균일 성 측정을 위한 초음파 센서에 대한 온도의 영향
샤피크키라가 ( Shafik Kiraga ),레자나심 ( Md Nasim Reza ),초두리밀런 ( Milon Chowdhury ),이슬람나피울 ( Md Nafiul Islam ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2021 한국농업기계학회 학술발표논문집 Vol.26 No.1
The increasing popularity of boom height controllers requires a desired nozzle height above the spray targets for effective spraying. The objective of this study was to determine the effect of temperature on nozzle height measurement using ultrasonic sensors and the impact on spray uniformity. Experiments were carried out with a constant nozzle spacing of 50 cm and a pressure of 600 kPa considering temperature compensation and non-compensation states of ultrasonic sensor measurements. Nozzle heights of 30, 50, and 70 cm were selected for reference. Two measurements were carried out for each selected height with a temperature compensated and non-compensated state at 15, 25, and 300C. The spray distribution was also determined for each measurements. Coefficient of Variation (CV) and percent measurement error (ME) were used to characterize spray uniformity and temperature effect on height measurement. The estimated heights with temperature compensation were closer to the reference heights, which exhibits a low ME. The ME increased from low to high temperatures. Temperature compensated heights resulted in more even spraying trends, with lower CV values accompanied by non-compensated heights. Our findings showed that, ultrasonic sensors need temperature correction for proper Nozzle height measurement and optimal spray distribution.
트랙터 부착형 배추 수집기 이송부 컨베이어 조인트 피로해석
카인미얏트시 ( Khine Myat Swe ),장보은 ( Bo-eun Jang ),나피울이슬람 ( Md Nafiul Islam ),밀런초두리 ( Milon Chowdhury ),이상희 ( Sang-hee Lee ),정다운 ( Da-un Jung ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2020 한국농업기계학회 학술발표논문집 Vol.25 No.1
The objective of the study was to predict the service life of the transportation conveyor joint of a tractor-mounted Chinese cabbage collector. The service life was predicted by a computer-aid analysis, and a field test was conducted for validated result. Galvanized steel and Alloy steel were used as tested materials. Calculated torques were exerted to the models and relevant shear stress with S-N curve on fatigue life was determined. Torque on the conveyor was measured by using torque sensor under various speed of hydraulic motor and tractor operation with out and with Chinese cabbage collection three replication each. The load spectra with cycle distributions were compared and its damage severeness to the operational speed was discussed. Maximum shear stress and density of Galvanized steel was shown better result than Alloy steel. No fatigue damage occurred under the minimum life cycle 107 for both models. Maximum shear stress and severeness of the conveyor was found as 0.08 MPa and 1.2 respectively at 120 rpm speed under Chinese cabbage collection. Maximum torque ratio was obtained as 0.03 at 20 rpm speed. This study was useful for manufacturers to design an effective conveyor and suit able improvement to fabricate the tractor-mounted Chinese cabbage collector.