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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Biosystems Engineering
Journal Basic Information
Journal DOI :
Korean Society for Agricultural Machinery
Editor in Chief :
Volume & Issues
Volume 19, Issue 4 - Dec 1994
Volume 19, Issue 3 - Sep 1994
Volume 19, Issue 2 - Jun 1994
Volume 19, Issue 1 - Mar 1994
Selecting the target year
Dynamic Characteristics of the Reciprocating Cutter-bar of Combine Harvester(I)
Chung, C.J. ; Lee, S.B. ; Noh, K.M. ;
Journal of Biosystems Engineering, volume 19, issue 3, 1994, Pages 163~174
This study was conducted to investigate the dynamic motion of knife drive system of combine harvester. A computer program was developed to simulate the dynamic motion of the knife drive linkage and its algorithm was evaluated through experiments. The results are summarized as follows : 1. The theorectical horizontal (the direction of knife's reciprocating motion) reaction forces at the supporting point of rocker arm and crank arm were changed in the similar sinusoidal trends with the measured reaction forces. 2. The maximum values of shaking moment and reaction force per one revolution of crank arm followed polynomial trends as the rotational speed of crank shaft increased. The unbalanced force acting on the driving system increased at high speed. Therefore, the rotational speed of crank shaft should be maintained in proper range at increased forward speed to decrease vibration of the knife drive system. 3. The added mass to the crank arm increased the dynamic unbalanced force at the supporting point of rocker arm. It counterbalanced the reaction force at the supporting point of crank arm.
Dynamic Characteristics of the Reciprocating Cutter-bar of Combine Harvester
Kwag, B.C. ; Chung, C.J. ;
Journal of Biosystems Engineering, volume 19, issue 3, 1994, Pages 175~184
This study was conducted to investigate experimentally the basic characteristics of the torque of the cutterbar driving shaft as the double-knife was used instead of the conventional standard single-knife type. A new design for inclined setting of the cutterbar relative to the direction perpendicular to combine harvester movement was investigated to test a possible reduction of concentrated load caused by the simultaneous cutting of many rows. It was evaluated that the maximum torque and mean total power of the driving shaft due to the cutting resistance of the rice straw were largely depended upon the rotational shaft-speed and straw feeding rate, but were resepectively 1.1~2.3 and 1.15~1.34 times higher compared to those while idling. It was also proved that the inclined setting of the cutterbar could save a considerable amount of energy required for its driving shaft.
Development of A Friction Type Garlic Separator
Park, J.B. ; Kim, J.T. ;
Journal of Biosystems Engineering, volume 19, issue 3, 1994, Pages 185~193
Both the wet and dry types of garlic peeling machines are being presently used in domestic garlic processing factory, but the dry type is more popular than the wet type because of higher peeling efficiency. The peeling efficiency of these machines is estimated 50 to 80%, depending on the difference in garlic varieties, physical properties and moisture content of garlic samples. If the peeling time is increased in order to improve the peeling efficiency, the damage on the surface of peeled garlic and the consumption of electric power are also increased. This study was carried out to solve these problems in garlic peeling operation and to obtain the optimun design factor for the friction type separator. The results are summarized as follows : 1. The average friction coefficients of peeled and unpeeled garlic samples were 0.91 and 0.51. respectively, for the acrylic plate, and 0.96 and 0.51, respectively, for the stainless plate. 2. For the inclined acrylic pipe with the pipe length 90 cm, the inclined angle
and the pipe diameter 45-55 mm, the falling time of peeled garlic samples was 0.2 sec, faster than unpeeled garlic samples. 3. For the inclined stainless pipe with the pipe length 90 cm, the inclined angle
and the pipe diameter pipe 35 mm, the falling time of peeled garlic samples was 0.7 sec, slower than that with the pipe diameter 47mm. 4. The stainless pipe with the pipe length 80~90 cm, the inclined angle
and the pipe diameter 40~50 mm was the most suitable as the material of friction pipe. 5. Experimental garlic peeling machine is composed of garlic sample feeding device, friction stainless pipe and hopper. The peeling efficiency was 81 to 96%, and the separating capacity, 600 gr/min.
Simulation of Silo System for Drying and Storage of Grains
Chung, J.H. ;
Journal of Biosystems Engineering, volume 19, issue 3, 1994, Pages 194~210
Development of Solar Energy-Underground Latent Heat Storage System for Greenhouse Heating
Song, H.K. ; Ryou, Y.S. ;
Journal of Biosystems Engineering, volume 19, issue 3, 1994, Pages 211~221
In this study, to maximize the solar energy utilization for greenhouse heating during the winter season, solar energy-underground latent heat storage system was constructed, and the thermal performance of the system has been analyzed to obtain the basic data for realization of greenhouse solar heating system. The results are summarized as follows. 1.
was selected as a latent heat storage material, its physical properties were stabilized and the phase change temperature was controlled at
. 2. Solar radiation of winter season was the lowest value in December, and Jinju area was the highest and the lowest value was shown in Jeju area. 3. The minimum inner air temperature of greenhouse with latent heat storage system(LHSS) was
higher than that of greenhouse without LHSS and was
higher than the minimum ambient air temperature. 4. Greenhouse heating effect of latent heat storage system was getting higher according to the increase of solar radiation and was not concerned with the variation of minimum ambient air temperature. 5. The relative humidity of greenhouse with latent heat storage system was varied from 50 to 85%, but that of greenhouse without LHSS was varied from 30 to 93%. 6. The heating cost of greenhouse with solar energy-latent heat storage system was about 24% of that with the kerosene heating system.
Characteristics of the Stored and Released Thermal Energy in Plastic Greenhouse with Underground Heat Exchange System
Lee, C.H. ; Park, S.J. ; Kim, Y.H. ; Kim, C.S. ; Rhee, J.Y. ;
Journal of Biosystems Engineering, volume 19, issue 3, 1994, Pages 222~231
The efficient use of solar energy for greenhouse heating is one of the most obvious applications to save the heating energy for greenhouse culture. To increase the efficiency of solar energy utilization in plastic greenhouse, underground heat exchange system was installed. Characteristics of the stored and released thermal enery in plastic greenhouse with underground heat exchange system was analyzed. The average stored and released thermal energy in this system were 1,484
day and 555
day, respectively. The average coefficient of performance of heat exchange system was found to be 2.86. Also an attempt was made to predict the air temperature in plastic greenhouse. The agreement between the results of prediction and that of measurement was relatively good.
Development of Low-Temperature Storage Method of Sweet Persimmons
Chung, J.H. ; Suh, S.R. ;
Journal of Biosystems Engineering, volume 19, issue 3, 1994, Pages 232~246
This study was conducted to develop the long-tenn storage method to minimize the black spot occurred on the surface of persimmons stored in the films at low temperature. The storage experiments were done with different films and persimmon varieties at
storage condition for 5 months, and then the physical and chemical characteristics of persimmons were tested monthly. The results were as follows : 1. The film 160 made from zeolites showed highest performance in well storings sweet persimmons for 5 months, compared with other films by eyesight. The initial moisture condensation inside the films seemed to cause the black spots on persimmons, and the effect of the film holes was never significant to prevent the black spots. 2. The sugar content was ranged from
regardless of film types and persimmom varieties, and it changed little for storage of 5 months. 3. The decrease rate of persimmom weight in the film 160 and 180 was 0.3% for storage of 5 months, while those in other films reached to 2%. The decrease rate of persimmon weight was least in the film 160 and 180. 4. The hardness of Fuyu least decreased in the films 160 and 380. It was changed from 36 kg/cnf to 8-27
, and that of Charyang was from 31
for storage of 5 months. The hardness of Charyang rapidly decreased as storage period increased. 5. The average rate of black spot(defect rate) of Fuyu measured by a computer image processing system was least in the film 160 by 0.5%, but those in other films was ranged from about 5% to 20% for storage of 5 months. The rate of black spot of Charyang was less than that of Fuyu among most of films. 6. The intensity, hue, and saturation in persimmon color changed according to storage period. Especially, the intensity of persimmon colors decreased as storage period increased, but it was least in the film 160. 7. An integrated long-term storage method of sweet persimmons was suggested in the basis of the experiments and literature reviews.
Reflectance Characteristics of the Tobacco Leaves
Cho, H.K. ; Kwon, Y. ; Bang, S.H. ;
Journal of Biosystems Engineering, volume 19, issue 3, 1994, Pages 247~257
Optical properties of the tobacco leaves were determined. Surface colors and reflectance characteristics of the flue-cured variety and the Burley variety with thin and thick leaves were measured. Color was measured by CIE colorimeter and reflectance was measured with a laboratory built reflectance meter utilizing optical bandpass filters whose center wavelengths are from 400 to 700 nm at intervals of 50 nm. The resulting data indicated that the measured color and reflectance would be useful in inspecting tobacco. However no single optical data could be used to successfully grade tobacco leaves.
Development of an Expert System for Mechanization of Entrusted Farming
Chang, D.I. ; Kim, S.R. ; Kim, M.S. ;
Journal of Biosystems Engineering, volume 19, issue 3, 1994, Pages 258~273
In this study, an expert system named ESMEF (Expert System for Mechanized Entrusted Farming) was developed. The function of ESMEF is to provide the various data and informations for entrusted farming such as farm machinery management data, mechanization systems by farm sizes, number of units and sizes of machinery needed, machinery replacement analysis, mechanization costs analysis. Mechanization systems were selected by ESMEF for different farming sizes of Chungnam Province and an economic analysis was conducted as an example. The results showed that the farm machinery purchasing costs were 1,344~4,829 thousand won per ha and there was no significant difference for farm sizes above 60 ha. The total annual machinery costs were 3,595~4,537 thousand won per ha, and a minimum cost was appeared for farm size of l00ha at first. According to this analysis, an optimum entrusted farming size would be 100ha by the present available farm machinery systems.