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Joint Research between Korea and Myanmar Agricultural Mechanization Department (AMD)
( Khine Myat Swe ),( Myo Khaing ),( Sun-ok Chung ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Joint research is performed that Korean made farm machinery is tested and evaluated adaptable to Myanmar farm land. Objectives of joint research are such as (1) to be shown performance testing of Korean made tractor, rice combine, drying and storage complex in the local field conditions of Myanmar. (2) to be modified the tested machines to improve their adaptability to local conditions as directed by the test results.(3) to be demonstrated and evaluated quality of the modified machines in the rural area of Myanmar. 90 HP diesel tractor, 75 HP reel-type rice combine and 2 ton rice drying and storage complex (DSC) are used for field test. Tractor is tested attached with blade, disc harrow and rotavator in Mandalay Region. Temperature of working parts is measured. Combine Harvester is tested in Mandalay, Ayeyawaddy and Nay Pyi Taw Regions. Workability, field capacity and cooling performance will be forecasted. Dryer test is emphasized on drying performance, energy, operational comfort and easiness to control, temperature and humidity, motor stability,fan, convey system and drying chamber. In conclusion, tractor is properly performed. For combine harvester, cooling and discharge systems are seen satisfactory. Grains with pinnacles are seen. But cutting and running systems need to be adjusted.Dryer is shown performance well. The tests and improvement will be continued in 2018. Agricultural mechanization department (AMD) hopes Korean made farm machinery will be market friendly with farmers in near future.
Theoretical Analysis of Power Requirement of a Four-Row Tractor-Mounted Chinese Cabbage Collector
Swe Khine Myat,ISLAM MD NAFIUL,Chowdhury Milon,ALI MOHAMMOD,Wing Sandah,전현종,이상희,정선옥,김대건 한국농업기계학회 2021 바이오시스템공학 Vol.46 No.2
Purpose Analysis of power requirement is the key issue to ensure the optimal design. The objectives of the study were to investigate theoretically the tractor hydraulic power and draft power requirement of a tractor-mounted Chinese cabbage collector system and to suggest design guidelines. Methods The major components of the Chinese cabbage collector under development were a belt type conveyor, a hydraulic motor, and three hydraulic cylinders. Hydraulic motor power, cylinder hydraulic power, and draft power for various speeds under unloaded and loaded conditions were calculated using theoretical equations. Different tractor configurations (44~74 kW), soil types (sand, silt, and clay), and hydraulic fluid capacity (1~5m3/hr) were considered to determine the tractor hydraulic power and engine power requirement. Results The power requirement of the hydraulic motor for the unloaded and loaded conditions was 1.14 kW and 1.24 kW, respectively, under the 120-rpm conveyer speed. Hydraulic power of 2 ×10−3 kW was required to fold or unfold the collecting conveyor. The maximum required draft power levels were 0.67, 0.81, 0.94, and 1.21 kW for the hard, firm, tilted, and soft soil conditions, respectively. Based on the results, the total maximum power requirement was calculated as 15.14 kW, of which 7.25 kW is for the hydraulic power (48%) and 7.89 kW for the draft power (52%), respectively. Conclusion The analysis of power requirements presented in this research can help estimate the tractor hydraulic power and draft power requirement to run a tractor-mounted Chinese cabbage collector efficiently.
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.
Application of angle sensors for yield monitoring correction of Chinese cabbage collector
시카인미얏트 ( Khine Myat Swe ),초두리밀런 ( Milon Chowdhury ),레자나심 ( Nasim Reza ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2021 한국농업기계학회 학술발표논문집 Vol.26 No.2
Yield monitoring and mapping is more effective for small farmers on farm management practices. The objectives of the study were to investigate the Chinese cabbage yield monitoring correction under tilt situation through various belt conveyor speeds during unloaded and loaded conditions and to verify the accuracy of the system. Two sets of dual-axis angle sensor were attached at the left top and bottom on an inclined cabbage collector frame. A load cell was installed at the conveyor outlet for the precision of yield sensor by the same method of angle sensors. Ten pieces of Chinese cabbage were randomly used for the test. The conveyor was driven by a 0.2 kW DC motor with different speeds of 0.05, 0.10, 0.15, 0.20 and 0.25 m/s. Measured angles in x-y direction and weight versus time were recorded. During the unloaded and loaded conditions, the standard deviation of measured tilt angle in x-y direction were 1.33o, 1.20o and 0.18o, 0.72o, respectively. It showed that tilt sensors were capable of detection with good accuracy. Any increase in conveyor speed showed positive correlation (R2=0.99) with cabbage yield. The range of tilt angle depends on various weight of cabbage and conveyor speed. The system can help stability prediction of the machine according to the agricultural working conditions.
카인미얏트시 ( Khine Myat Swe ),밀런초두리 ( Milon Chowdhury ),장보은 ( Bo-eun Jang ),산다윙 ( Sandah Wing ),전현종 ( Hyeon-jong Jun ),이상희 ( Sang-hee Lee ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2020 한국농업기계학회 학술발표논문집 Vol.25 No.2
The objective of the study was to investigate physical and strength properties of radish and Chinese cabbage. Each fifteen pieces of radish and Chinese cabbage were used for the experiment. Mass, diameter, height and cutting diameter were recorded to obtain basic data for the physical quality properties of vegetables by using digital weighting balance, digital calliper and ruler. Universal Testing Machine attached with 500 N loadcell and circular combined blade were also used to measure possible compression force of vegetables. Then the strength was calculated and different results of radish and Chinese cabbage were observed. Average mass, diameter, height of radish and Chinese cabbage were 1.52 and 1.33 kg, 105 and 155 mm, 214 and 312 mm respectively. Stem and root cutting diameter, strength of radish and Chinese cabbage were 49 and 27.36 mm, and 0.02 and 0.15 N/mm2 respectively. These physical properties of the vegetables affect the conveying characteristics of solid materials. The results of the present study provide useful information for the design components of industry.
Fabrication and field performance test of a tractor-mounted 6-row cabbage collector
한광민,ALI MOHAMMOD,KHINE MYAT SWE,Sumaiya Islam,정선옥,김대건 충남대학교 농업과학연구소 2021 Korean Journal of Agricultural Science Vol.48 No.1
The cultivation area for domestic cabbage increased by 26.3% from 10,968 ha in 2019 to 13,854 ha in 2020, and among leafy vegetables, the cabbage cultivation area was 62%, and production was 78.9%. Demand for field crop production of cabbage, which has a relatively high-income level compared to rice farming, is increasing, and mechanization of the field operation is urgently needed due to the insufficient development of related farming machinery. In this study, a prototype fabrication and performance test of a tractor-attached cabbage collector was carried out. The transport section was divided into two parts, one for the feeding and transportation and the other for the screening and packaging to selectively collect cabbages in bulk bags or boxes. The length of the primary collecting conveyor was designed to meet the field conditions of the Korean cabbage cultivation standards so that six cultivation rows could be worked simultaneously. Power was controlled by a hydraulic transmission line of the tractor and was easily mounted onto the 3-point hitch links behind the tractor. When the performance was evaluated, the transfer rate, loss rate, damage rate, and work performance were 100, 0, 1.2%, and 1.9 h·10 a-1. Final improvement and commercialization of the prototype would considerably contribute to the mechanization of harvesting cabbage, the main ingredient of Kimchi.
스마트 온실 환경 제어를 통한 사용자 편의성 향상 및 센서 인터페이스 개발을 위한 기초 테스트
산다윙 ( Sandah Wing ),모하마드알리 ( Mohammod Ali ),밀론초두리 ( Milon Chowdhury ),카인미얏트시 ( Khine Myat Swe ),정재혁 ( Jae-hyeok Jeong ),정선옥 ( Sun-ok Chung ) 한국농업기계학회 2020 한국농업기계학회 학술발표논문집 Vol.25 No.1
Greenhouse technologies are becoming popular for its crop production capabilities in adverse climatic conditions, however, farmers are still facing difficulties to control the ambient environment due to lower-grade sensor interface. The objective of this study is to do the basic tests of sensors for developing an interface for the user comfort and ease during the ambient environment control of greenhouses. A survey was conducted for selecting the required sensors considering their principles, and specifications. Three kinds of temperature, humidity, and carbon dioxide sensors, two kinds of soil water content sensor, a light intensity sensor, a solar radiation sensor, a rain gauge, a wind speed sensor, and a wind direction sensor are selected for the test. A circuit diagram was designed, and the power input, signal output, and response time of each sensor were checked. Based on the results, additional devices, such as power stabilizer, AD converter, resistor, were selected. The input power fluctuated on an average from 0.05 to 0.5 V, and the relevant signal output voltage varied from 0.1 to 1.2 V. Most of the sensors showed a quick response (i.e., 25μs, 1.25μs, 0.025s, and 0.05s). Results indicate that input power has a great influence on signal output and response time. A power converter could be needed to supply a stable power using a switching diode, resistors and capacitors. The developed sensor interface would be able to measure environmental parameters more accurately using any kind of sensors and increase the ease of users.
ALI MOHAMMOD,이예슬,Chowdhury Milon,KHAN NADEEM ALI,Swe Khine Myat,Rasool Kamal,Kabir Md Shaha Nur,이대현,정선옥 한국농업기계학회 2021 바이오시스템공학 Vol.46 No.1
Purpose Overturning and high vibration levels are major causes of agricultural farm fatalities and mechanical troubles during operation. This study assessed the stability angles of a self-propelled 1-row Chinese cabbage harvester and measured the vibration levels for safety under different conditions. Methods The stability of the Chinese cabbage harvester was investigated using computational methods, and the vibration levels were measured on off-road and field conditions. The three-dimensional model of the Chinese cabbage harvester was designed and simulated to evaluate the static stability angles employing commercial software. The relationship between vehicle and deformable soil was calculated using the empirical models. The critical angles and the climbing ability of the developed harvester were examined under loaded and unloaded conditions. The vibration exposures were measured on the cabbage conveyor and the power transmission part in static, off-road, and field operation conditions under various speeds and slopes. Results The stability simulation results showed the minimum lateral stability angles of the harvester were pointed on the loaded condition compared to the unloaded condition. The maximum sideways overturning angle of the Chinese cabbage harvester was recorded as 32° at 150° ground angle and 30° at 270° ground angle, from the moving directions clockwise, for unloaded and loaded conditions. The high levels of vibration were measured at 0.19, 1.64, and 1.38 m/s2 for static, off-road, and field conditions at high speeds among X-, Y-, and Z-axis directions, respectively. Besides, the considerable vector sum (Av) exposures were calculated 1.54, 2.14, and 2.48 m/s2 at 0.3, 0.6, and 0.9 m/s forward speeds on the cabbage conveyor part. Conclusion The concept and guidelines of this research could help to protect operators from safety risks and expose vibration characteristics during farm operations of the self-propelled Chinese cabbage harvester prototype.