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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 18, Issue 4 - Dec 1993
Volume 18, Issue 3 - Sep 1993
Volume 18, Issue 2 - Jun 1993
Volume 18, Issue 1 - Mar 1993
Selecting the target year
Improvement of Water Cooling System of a Small Diesel Engine
Kim, S.R. ; Myung, B.S. ;
Journal of Biosystems Engineering, volume 18, issue 1, 1993, Pages 3~14
This study was conducted to obtain basic data which affected engine performance of the power tiller being widely used in the rural area. Among the various factors being influenced engine performance, factors of radiator, of capacity of cooling water, and of efficiency of cooling fan were considered as the major factors in this study. Because diesel engine being used to power tiller are scarce of cooling water, it is over-heated in time of rated power. Therefore, a experiment was performed to determine the capacity of cooling water of engine with circuit system of cooling water adhered.
A Study on the Wear of Rotary Blades
Choi, S.I. ; Kim, J.H. ; Lee, Y.K. ;
Journal of Biosystems Engineering, volume 18, issue 1, 1993, Pages 15~20
Wearness has been a major failure criterion in Korean-made rotary blade. However, few studies have been conducted to improve it. In this study, the fundamental data obtained from the measurement of wearness and failure of rotary blade were analyzed to provide a guideline for the design of rotary blades. For the straight part(about 20-23 em from bolt hole) from the bolt hole to bending point of rotary blade, modifications were proposed for improvements, however, for the portion from bending point to tip was made no design recommendations because the failure behavior of that portion was difficult to analyze with the experimental data. The results are summarized as follows. 1. The current V-shape section has to be moved about 5 em toward the bending point of rotary blade. 2. The section modulus at the portion about 5-7 em distant from bolt hole has to be increased about 15-20 %. 3. The V-shape section has to be changed into U-shape to reduce the on account of recieving initial stress in blades. 4. The radius of curvature of the neck(the portion about 5-7 cm apart from bolt hole) has to be made larger to decrease the stress concentration.
Development of a Potato Harvester for Tractors
Kang, W.S. ; Shin, Y.B. ; Kim, S.H. ; Hahm, Y.C. ;
Journal of Biosystems Engineering, volume 18, issue 1, 1993, Pages 21~29
The purpose of this study was to develope a potato combine which can be attached to and controlled by three-point hitch of tractors. A vibrating mechanism was designed and constructed to dig potatoes, and to evaluate the effects of vibration on the potato harvesting performance of the test machine, potato separation from soil, harvesting loss, and damage to the potatoes. Three types of potato pick-up mechanisms were constructed and tested. Digging performance and material flow on the blade were improved as the vibrating amplitude and frequency increased and as the travel speed decreased. The sum of unrecovered and damaged potatoes was up to 7.8%. Three pick-up devices were not found to be useful by failing to elevate about 30% of dug potatoes to a given height.
Mechanical Properties of Cucumber under Bending Force
Kim, M.S. ; Song, C.H. ; Park, J.M. ;
Journal of Biosystems Engineering, volume 18, issue 1, 1993, Pages 30~36
Cucumbers being living biological materials are generally vulnerable to external forces, especially, bending force during the processes, because they have usually longish shape. Understanding the mechanical and viscoelastic properties of cucumber is important to analyze various characteristics which might be helpful in determining design parameters for the processing equipment such as sorting, packaging and transporting machine. The objectives of this study were to determine ultimate bending strength, deflections, and hysteresis losses for the cucumbers from the bending tests. Within the range of loading rate from 20 to 100mm/min, the ultimate bending strength of the cucumber samples were 525-630kPa at the Gyeousalicheongjang and the Baekdadagi, and 476~618kPa at the Cheongjangmadi, respectively, but the ultimate bending deflection ratio of the Cheongjangmadi showed the highest value among the tested samples. The effect of loading rate on the physical properties of the cucumber was relatively significant, all considered physical properties and degree of elasticity of the cucumber increased with the loading rate, but the hysteresis loss decreased with it.
Development of Computer Measurement and Control System for Plant Growth Responses
Kim, M.S. ; Choi, D.S. ; Park, J.M. ; Ryu, K.H. ; Noh, S.H. ;
Journal of Biosystems Engineering, volume 18, issue 1, 1993, Pages 37~47
This study was conducted to develop the on-line monitoring system for plant growth responses. The system consisted of two parts. One system was the measuring system and the other was its controlling system. The established measuring systems were the ultrasonic wave sensor driver for height of plant, the potentiometer for diameter of plant stem, and the weighing system with strain gage application for plant weight. Also, computer program for measurement and controlling was developed, and the whole system was tested by the fabricated plant, and the actual plant growth responses were monitored by the system. When monitoring the actual plant growth responses, even the small amount of plant growth resposes could be measured by the system within tolerable error ranges.
Heat and Mass Transfer Characteristics of Red-Pepper Powder by Convection and Radiation Conditioning
Kang, S.W. ; Koh, H.K. ;
Journal of Biosystems Engineering, volume 18, issue 1, 1993, Pages 48~59
Pepper is considered as one of main crops not only in the agricultural production but also in farmer's income. Red-pepper is much consumed by Koreans everyday in the form of powder, but its processing processes such as drying and grinding cause many problems. Consequently, it is required to improve the quality of red-pepper powder for high dietary life. This study was conducted to investigate the heat and mass transfer characteristics of red-pepper powder by convection and radiation conditioning. Physical and thermal properties such as specific heat, thermal conductivity and thermal diffusivity were also determined in terms of moisture content of the powder.
Experimental Analysis for Environments Variations of Greenhouses -Distributions and Variations of Temperature, Relative humidity, Illumination, Carbon dioxide and Wind velocity-
Kim, Y.B. ; Park, J.C. ; Paek, Y. ;
Journal of Biosystems Engineering, volume 18, issue 1, 1993, Pages 60~70
In this study, the environment variations and distributions in different types of greenhouses were measured and analyzed. The elements of environment analyzed were temperature, relative humidity, illumination, carbon dioxide and wind velocity. The analyzed greenhouse types were auto-multi type which has an automatic environment control system and multiple continuous arches, regular-multi type which has an temperature control system and multiple continuous arches, and single arch type which has no environment control system without manual temperature keeping method. The results of this study can be used for the greenhouse building and managements.
Energy Consumption Pattern for Rice Production in Korea
Kim, Y.J. ;
Journal of Biosystems Engineering, volume 18, issue 1, 1993, Pages 71~77
This study was conducted in order to figure out the energy consumption pattern in rice production system of Korea, with literature investigation focused on energy requirement in rice production system in worldwide. The investigation reveals that 24,994 MJ/ha was needed to produce 4,500kg of rice production or 5.55 MJ/kg was consumed. The major enegry consumptions are resulted from the application of nitrogen fertilizer, fuel for farm machinery, and farm machinery embodied energy, which showed somewhat different energy consumption pattern than that of the developed country, like, U.S.A. Based on the machinery chosen in this investigation, it was found that 32.7% of the fuel energy, 2,431.8MJ, was consumed in drying operation, 32.2%, 2.402MJ, in tillage and land preparation. 25.8%, 1.923.6MJ in harvest. A linear relationship was found in pre harvest energy input and output of rice production.
Principle and Application of Control Stepping Motors
Lee, D.W. ;
Journal of Biosystems Engineering, volume 18, issue 1, 1993, Pages 78~88