간행물

한국농업기계학회> 바이오시스템공학(구 한국농업기계학회지)

바이오시스템공학(구 한국농업기계학회지)

Journal of biocystems Engineering

  • : 한국농업기계학회
  • : 농학분야  >  농공학
  • : KCI등재
  • :
  • : 연속간행물
  • : 계간
  • : 1738-1266
  • : 2234-1862
  • : 한국농업기계학회지(~2004)→바이오시스템공학(2004~)

수록정보
수록범위 : 1권1호(1976)~43권4호(2018) |수록논문 수 : 1,770
바이오시스템공학(구 한국농업기계학회지)
43권4호(2018년 12월) 수록논문
최근 권호 논문
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KCI등재

1Experimental Study of the Dynamic Characteristics of Rubber Mounts for Agricultural Tractor Cabin

저자 : Kyujeong Choi , Jooseon Oh , Davin Ahn , Young-jun Park , Sung-un Park , Heung-sub Kim

발행기관 : 한국농업기계학회 간행물 : 바이오시스템공학(구 한국농업기계학회지) 43권 4호 발행 연도 : 2018 페이지 : pp. 255-262 (8 pages)

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Purpose: To obtain the dynamic characteristics (spring stiffness and damping coefficient) of a rubber mount supporting a tractor cabin in order to develop a simulation model of an agricultural tractor. Methods: The KS M 6604 rubber mount test method was used to test the dynamic characteristics of the rubber mount. Of the methods proposed in the standard, the resonance method was used. To perform the test according to the standard, a base excitation test device was constructed and the accelerations were measured. Results: Displacement transmissibility was measured by varying the frequency from 3-30 Hz. The vibration transmissibility at resonance was confirmed, and the dynamic stiffness and damping coefficient of the rubber mount were obtained. The front rubber mount has a spring constant of 1247 N/mm and damping ratio of 3.27 Ns/mm, and the rear rubber mount has a spring constant of 702 N/mm and damping ratio of 1.92 Ns/mm. Conclusions: The parameters in the z-direction were obtained in this study. In future studies, we will develop a more complete tractor simulation model if the parameters for the x- and y-directions can be obtained.

KCI등재

2Analytical Study on Improvement in Load Sharing for Planetary Gear Set using Floating Ring Gear

저자 : Woo-jin Chung , Kyujeong Choi , Jooseon Oh , Young-jun Park , Ki-hun Lee

발행기관 : 한국농업기계학회 간행물 : 바이오시스템공학(구 한국농업기계학회지) 43권 4호 발행 연도 : 2018 페이지 : pp. 263-272 (10 pages)

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Purpose: The load on the planet gear of a planetary gear set is uniformly distributed. However, manufacturing and assembly errors cause uneven load sharing in the planetary gear set. To solve this problem, most studies have suggested applying a floating sun gear to the planetary gear set. However, the effect of the floating ring gear and floating carrier has not been extensively studied. This study aimed to investigate the effect of the floating ring gear. Methods: Two models were developed; one was the fixed ring gear model, and the other was the floating ring gear model. In the fixed ring gear model, the clearance between the ring gear and the housing was 0 μm, and in the floating ring gear model, the clearance was from 10 μm to 100 μm. The load sharing of the planetary gear set was evaluated by the load sharing factor. Results: Our study showed that with increase in clearance, the load sharing factor of the planetary gear set approached unity. In addition, when the clearance increased above a certain level by which a fully floating ring gear was achieved, the load sharing factor was not affected by the clearance. Conclusions: This indicates that the fully floating ring gear increased the power density of the planetary gearbox by uniformly dividing the load of the planetary gear set. For this reason, the size of the gearbox could be decreased by using a fully floating ring gear.

KCI등재

3Development of Optimized Headland Turning Mechanism on an Agricultural R obot f or K orean G arlic F arms

저자 : Jongwoo Ha , Changjoo Lee , Abhishesh Pal , Gunwoo Park , Hakjin Kim

발행기관 : 한국농업기계학회 간행물 : 바이오시스템공학(구 한국농업기계학회지) 43권 4호 발행 연도 : 2018 페이지 : pp. 273-284 (12 pages)

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Purpose: Conventional headland turning typically requires repeated forward and backward movements to move the farming equipment to the next row. This research focuses on developing an upland agricultural robot with an optimized headland turning mechanism that enables a 180° turning positioning to the next row in one steering motion designed for a two-wheel steering, four-wheel drive agricultural robot named the HADA-bot. The proposed steering mechanism allows for faster turnings at each headland compared to those of the conventional steering system. Methods: The HADA-bot was designed with 1.7-m wide wheel tracks to travel along the furrows of a garlic bed, and a look-ahead path following algorithm was applied using a real-time kinematic global positioning system signal. Pivot turning tests focused primarily on accuracy regarding the turning radius for the next path matching, saving headland turning time, area, and effort. Results: Several test cases were performed by evaluating right and left turns on two different surfaces: concrete and soil, at three speeds: 1, 2, and 3 km/h. From the left and right side pivot turning results, the percentage of lateral deviation is within the acceptable range of 10% even on the soil surface. This U-turn scheme reduces 67% and 54% of the headland turning time, and 36% and 32% of the required headland area compared to a 50 hp tractor (ISEKI, TA5240, Ehime, Japan) and a riding-type cultivator (CFM-1200, Asia Technology, Deagu, Rep. Korea), respectively. Conclusion: The pivot turning trajectory on both soil and concrete surfaces achieved similar results within the typical operating speed range. Overall, these results prove that the pivot turning mechanism is suitable for improving conventional headland turning by reducing both turning radius and turning time.

KCI등재

4Prototype Development of a Three-wheel Riding Cultivator and Its Basic Performance

저자 : Beom Seob Lee , Soonam Yoo , Changhoon Lee , Il Su Choi , Yong Choi , Young Tae Yun

발행기관 : 한국농업기계학회 간행물 : 바이오시스템공학(구 한국농업기계학회지) 43권 4호 발행 연도 : 2018 페이지 : pp. 285-295 (11 pages)

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Purpose: The aim of this study is to develop a three-wheel riding cultivator for improving the performance of the current four-wheel riding cultivators in the market. Methods: A prototype three-wheel riding cultivator with the rated power of 15.5-kW, a primary hydrostatic and a two-speed selective gear transmission shifts, front/rear three-wheel drive, a hydraulic wheel tread adjustment, and the mid-section attachment of the major implements was designed and constructed. Its specifications and basic performance are investigated. Results: The maximum speeds of the prototype at the low and high stages were measured to be approximately 7.31, and 11.29 km/h in forward travel, respectively, and approximately 3.60, and 6.37 km/h in rearward travel, respectively. The minimum ground clearance is shown to be 670 mm. The rotating speeds of the power takeoff (PTO) shaft at the low and high stages are shown to be approximately 795 and 1,140 rpm, respectively. The tread of the rear wheels, the minimum radius of turning, and the maximum lifting height of the parallel link device are measured to be within 1,320-1,720 mm, 2.80 m, and 390 mm, respectively. Approximately 25.3% and 74.7% of the total weight of the prototype are distributed in the front and rear wheels on flat ground, respectively. When the tread of rear wheels increased from 1,320 to 1,720 mm, the left and right static lateral overturning angles increased from 33.4° to 39.1° and from 29.0° to 36.1°, respectively. Conclusions: The prototype three-wheel riding cultivator showed a wide range of travel and PTO speeds, high minimum ground clearance, small minimum radius of turning, and easy control of the rear wheel tread. Further, the easy observation of cultivating operations by mid-mounting the implements can improve quality of work. Therefore, the prototype is expected to contribute to the riding mechanization of cultivating operations for various upland crops in Korea.

KCI등재

5Sorghum Harvesting Using a Head-feeding Type Rice Combine

저자 : Hyeon Jong Jun , Il Su Choi , Tae Gyoung Kang , Yong Choi , Duck Kyu Choi , Choung Keun Lee , Sang Hun Kim

발행기관 : 한국농업기계학회 간행물 : 바이오시스템공학(구 한국농업기계학회지) 43권 4호 발행 연도 : 2018 페이지 : pp. 296-302 (7 pages)

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Purpose: The aim of this study was to determine appropriate threshing and selection conditions for sorghum harvesting using a rice combine-harvester. Methods: Sorghum harvesting performance was tested using an actual rice combine. Through this test, the grain loss rate and the composition of crops according to the engine and fan speeds of the combine were investigated. Furthermore, the optimal threshing and selection conditions were determined by carrying out a harvest test based on the opening size factor of the concave in a test field. Results: The grain loss rate for the sorghum using a concave (18×18 mm) of the rice combine was the lowest at 0.1% at a chaffer angle of 40°, engine speed of 2000 rpm, and fan speed of 20 m/s, but the sorting sieve clogged frequently. Furthermore, as the engine speed and fan speed increased, the grain loss rate also increased. The sorghum harvesting test results of the combine according to the concave opening size showed that the grain loss rate was 0.5% at a driving speed of 0.5 m/s, with a concave opening diameter of 13 mm, a chaffer angle of 40°, a concave sieve oscillation frequency of 4.8 Hz, a fan speed of 20 m/s, and an engine speed of 2000 rpm. Conclusions: Findings showed that sorghum could be harvested using a head feeding rice combine.

KCI등재

6The Study on the Design Factors of the Groove-Roller Seed Metering Device for Seeder of Foxtail millet & Sorghum

저자 : Il Su Choi , Na Rae Kang , Young Keun Kim , Hyeon Jong Jun , Yong Choi , Tae Gyoung Kang , Chang Sik Hyun , Sang Hee Lee , Jin Gu Kim , Seoung Hwa Yu , Sun Ok Chung

발행기관 : 한국농업기계학회 간행물 : 바이오시스템공학(구 한국농업기계학회지) 43권 4호 발행 연도 : 2018 페이지 : pp. 303-310 (8 pages)

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Purpose: This research was conducted to determine the design factors of a seed-metering device for the development of a seeder. The device allows the seeder to sow precisely one to three seeds of foxtail millet and sorghum. To obtain fundamental information regarding the design of the seed-metering device, examination of the physical properties of foxtail millet and sorghum was conducted. Methods: Based on the results of an adaptability test using an existing seeder with foxtail millet and sorghum, an experimental roller-type seed-metering device was made. The seeding factors considered during the experiment were the width, length, and depth, as well as the shape of the groove in the seed-metering roller. By adapting an analysis of variance, the experimental results of the seeding factors were analyzed. Results: The measured results of the respective lengths and widths of the seeds were 2.11 and 1.64 mm for foxtail millet, and 3.68 and 3.32 mm for sorghum, respectively. The weight of 1,000 seeds was 2.43 g for foxtail millet and 17.5 g for sorghum. The seeds were of an elliptical shape, considering the length and width. A sieve analysis showed that the size distribution of foxtail millet was quite regular whereas that of sorghum was irregular. Conclusions: The seeding results showed that the rates of incorrect planting were low when the groove of the roller-type metering device is an elliptical type. To sow one to three seeds, the groove of roller-type metering devices 2.0 mm x 4.0 mm x 1.5 mm (width x length x depth) for foxtail millet, and 4.0 mm x 8.0 mm x 3.0 mm and 4.5 mm x 8.0 mm x 3.0 mm (width x length x depth) for Sorghum.

KCI등재

7Prototype Development of a Small Combine for Harvesting Miscellaneous Cereal Crops and its Basic Performance

저자 : Beom Seob Lee , Soonam Yoo , Changhoon Lee , Young Tae Yun

발행기관 : 한국농업기계학회 간행물 : 바이오시스템공학(구 한국농업기계학회지) 43권 4호 발행 연도 : 2018 페이지 : pp. 311-319 (9 pages)

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Purpose: The aim of this study is to develop a small combine for harvesting miscellaneous cereal crops. Methods: A prototype small combine was designed and constructed. Its specifications and basic performance were investigated. Results: The prototype small combine for harvesting miscellaneous cereal crops was designed and constructed to reflect similar specifications as those of the conventional combine. The prototype small combine comprises a diesel engine with the rated power/speed of 22.0 kW/2,600 rpm, three-stage primary and two-stage speed range transmission shifts, and a double acting threshing part. The maximum travel speeds of the prototype combine are approximately 0.72 m/s, 2.50 m/s, 0.30 m/s at the low, high speed range shifts in the forward direction, and while traversing in the reverse direction, respectively. The minimum radius of turning was approximately 1.50 m. In a static lateral overturning test, the prototype combine overturned neither to the right nor to left on a 30° slope. The results of an oilseed rape harvesting test included the maximum operating speed of 0.32 m/s, the grain loss ratio of approximately 9.0%, and the effective field capacity of approximately 10.3 a/h. Additionally, among the outputs in grain outlet, the whole grains, damage grains, and materials other than grain (MOG) ratios accounted for 97.4%, 0.0%, and 2.6%, respectively. Conclusions: The prototype small combine for harvesting miscellaneous cereal crops indicates good driving ability and stability. The results of the oilseed rape harvesting test reveal that the harvesting performance must be enhanced such that the separating and cleaning parts are more suitable for each type of crop, thus reducing grain loss and foreign substances among the outputs in grain outlet. An improved small prototype combine could be used effectively to mechanize the harvesting of miscellaneous cereal crops in small family farms or semi-mountainous areas.

KCI등재

8Harvesting Performance of the Prototype Small Combine for Buckwheat and Adlay

저자 : Soonam Yoo , Changhoon Lee , Beom Seob Lee , Young Tae Yun

발행기관 : 한국농업기계학회 간행물 : 바이오시스템공학(구 한국농업기계학회지) 43권 4호 발행 연도 : 2018 페이지 : pp. 320-330 (11 pages)

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Purpose: The aim of this study was to investigate the harvesting performance of a prototype small combine for buckwheat and adlay. Methods: The prototype small combine was designed and constructed. Its ratio of grain loss, ratio of output components in the grain outlet, and field capacity for harvesting buckwheat and adlay were analyzed through field tests. Results: The prototype small combine required a working width of about 0.6 to 0.7 m to harvest buckwheat. The maximum travel speed was about 0.36 m/. The total ratio of grain loss was about 21.6%, which consisted of 8.8% at the header and 12.8% at the dust outlet. The grain and the material other than grain (MOG) ratios at the grain outlet were 94.1% and 5.9% respectively. In the case of adlay harvest, the maximum working width was about 1.2 m, that is, two rows. The range of maximum travel speed was about 0.45 to 0.46 m/s. When adlay was harvested in one row, the total ratio of grain loss ranged from 36.3 to 42.8% according to the cutting height. The cutting height of 30 cm resulted in a higher total ratio of grain loss than 60 cm and 90 cm. When the cutting height was 60 cm, there was no significant change in the total ratio of grain loss according to the number of working rows and the stage of the primary transmission shift. The total ratio of grain loss ranged from 35.2 to 37.7%. The grain and the MOG ratios at the grain outlet ranged from 93.1 to 95.8% and from 4.2 to 6.9%, respectively. No significant difference was observed in relation to cutting height, number of working rows, and the stage of the primary transmission shift. Conclusions: The prototype small combine for harvesting miscellaneous cereal crops showed good potential for the efficient harvesting of buckwheat and adlay. However, to improve the harvesting performance, there seems to be a need to develop new crop varieties suitable for machine-based harvesting and improve the transmissions, reels, separation/cleaning systems.

KCI등재

9Determination of PID Coefficients for the Ascending and Descending System Using Proportional Valve of a Rice Transplanter

저자 : Md. Abu Ayub Siddique , Wan-soo Kim , Seung-yun Baek , Yeon-soo Kim , Chang-hyun Choi , Yong-joo Kim , Jin-kam Park

발행기관 : 한국농업기계학회 간행물 : 바이오시스템공학(구 한국농업기계학회지) 43권 4호 발행 연도 : 2018 페이지 : pp. 331-341 (11 pages)

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Purpose: This study was conducted to develop a linear Proportional-Integral-Derivative (PID) control algorithm for the ascending and descending system of a rice transplanter and to analyze its response characteristics. Methods: A hydraulic model using a single-acting actuator, proportional valve and a PID control algorithm were developed for the ascending and descending system. The PID coefficients are tuned using the Ziegler-Nichols (Z-N) method and the characteristics of unit step response are analyzed to select the PID coefficients at various pump speeds. Results: Results showed that the performance of the PID controller was superior in any condition. It was found that the highest settling time and maximum overshoot were less than 0.210 s and 5%, respectively at all pump speed. It was determined that the steady state errors were 0% in all the cases. The lowest overshoot and settling time were calculated to be nearly 2.56% and 0.205 s, respectively at the pump rated speed (2650 rpm). Conclusions: The results indicated that the developed PID control algorithm would be feasible for the ascending and descending system of a rice transplanter. Finally, it would be helpful to plant the seedlings uniformly and improve the performance of the rice transplanter.

KCI등재

10Development of Environmental Control System for High-Quality Shiitake Mushroom (Lentinus edodes (Berk.) Sing.) Production

저자 : Jin-kyung Kwon , Seung-hee Kim , Jong-gil Jeon , Youn-ku Kang , Kab-yeol Jang

발행기관 : 한국농업기계학회 간행물 : 바이오시스템공학(구 한국농업기계학회지) 43권 4호 발행 연도 : 2018 페이지 : pp. 342-351 (10 pages)

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Purpose: Recently, an increasing number of farms have been cultivating shiitake mushrooms using a sawdust substrate and a cooler/heater. In this study, an attempt was made to develop an environmental control system using a heat pump for cultivating high-quality shiitake mushrooms. Methods: An environmental control system, consisting of an air-to-water type heat pump, a thermal storage tank, and a radiator in a variable opening chamber, was designed and fabricated. The system was also installed in the cultivation facility of a farm cultivating shiitake mushrooms so as to compare the proposed control system with a conventional environmental control system using a cooler-condensing unit and an electric hot water boiler. Results: The uniformity of the environment was analyzed through environment measurements taken at several positions inside the cultivation facility. It was determined that the developed environmental control system is able to control the variations in temperature and relative humidity to within 1% and 3%, respectively. In addition, a maximum temperature difference of 30°C (maximum of 35°C, minimum of 5°C) and a maximum relative humidity difference of 30% (maximum of 90%, minimum of 60%) can be attained within 30 min inside the cultivation facility through the cooling of the heat pump and heating of the radiator in a variable opening chamber. Thus, the developed control system can be used to cultivate high-quality shiitake mushrooms more effectively than a conventional cooler and heater. Conclusions: In comparison with a conventional environmental control system, the developed system decreased the yield of ordinary mushrooms by 65%, and increased that of high-quality mushrooms by 217%. This corresponds to a 16% increase in gross farm income. Consequently, the developed system is expected to improve the income of shiitake mushroom cultivating farms.

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