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Volume 56, Issue 5
Displaying 1-13 of 13 articles from this issue
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K. MAEDA1994 Volume 56 Issue 5 Pages 1-2
Published: 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2186K) -
Investigation of Modal Parameters Applying Numerical AnalysisHideo HASEGAWA, Masayuki KOIKE, Toshio KONAKA, Tomohiro TAKIGAWA1994 Volume 56 Issue 5 Pages 3-11
Published: 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAt the beginning of optimum design study of tractor frame, modal analysis including sensitivity analysis was carried out to derive some fundamental design data applicable for further synthesis of vibration problems. Two models designated as model-A and-B respectively were used and the set of design parameters consisted of the number of partition walls of the power transmission case, thickness of the differential housing and the frame thickness. In a model-A, the thickness of partition walls and frame showed to be highly sensitive to natural frequency. In a model-B, the sensitivity of specific design parameters were evaluated quantitatively. Based on the result of frequency response analysis, with the decrease of the frame thickness from 25mm to 15mm, the maximum amount of decrease in terms of the acceleration level toward vertical direction took approximately 15dB at the connection of tractor frame and seat base.View full abstractDownload PDF (1604K) -
Principle of Coating MechanismYasushi KONO, Tsuneo KAWAMURA, Osamu KOBORI, Isao NISHIMURA1994 Volume 56 Issue 5 Pages 13-18
Published: 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSSince seeding is the first step for the growth and control of plants, a new process and a technique for seed coating and a coating apparatus are introduced to increase the germinating ratio in the precision seeding of vegetables. Three kinds of food additives are selected as a coating material considering the safety for food. Sodium alginate (3% density) is considered to be the most suitable material for the coating and the seeding processes. The hardening agent used was calcium chloride. An experimental seed coating apparatus, with double cylindrical nozzles, demonstrated good results. We are now in the process of constructing the prototype of a practical and automatic seed-coating machine.View full abstractDownload PDF (2883K) -
Temperature Estimation of Bulk Rough RiceYasuhiko SAWADA, Kazuo HORIBE1994 Volume 56 Issue 5 Pages 19-26
Published: 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSReal conditions of radiation drying by solar energy, the countermeasures to increase the drying rate in this method and the influence of air blast and layer agitation were investigated in the previous report. In this study, temperature change within the bulk rough rice was numerically computed by use of mathematical model. From the comparison of this estimation model close agreement between calculated values and experimental ones was obtained, and the usefulness of this model was recognized.View full abstractDownload PDF (1355K) -
Frying Simulation under Reduced PressureSatoshi MURATA, Fumihiko TANAKA, Yasuhiro NAKATA, K. S. P. AMARATUNGA1994 Volume 56 Issue 5 Pages 27-33
Published: 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAs one of the new food processing technology, frying under reduced pressure has lately attracted attention. It is considered to be a kind of drying process of foods with oil under reduced pressure. Its merits are efficiency of dehydration, inhibition of brownish discoloration or oxidation in products and oil, improvement of product quality, etc. However, there were only few research examples of frying food materials under reduced pressure. We considered it a possible practical method and analyzed the phenomenon in the dehydration of potato. Under constant vacuum degree (0.667kPa), we measured temperature changes in sample and oil, as well as the initial and final weight of sample in a range from 60 to 100°C. Then we simulated the results with Runge-Kutta-Gill method, taking into consideration the process of heat and mass transfer, with the rate of chemical reaction of gelatinization and the results were agreed well with the experimental data.View full abstractDownload PDF (1074K) -
Guo-Rong XUE, Toshitaka UCHINO, Masaki MATSUO1994 Volume 56 Issue 5 Pages 35-42
Published: 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to make clear the effect of corona discharge on the drying promotion of agricultural products, the drying characteristics of radish were investigated under the various conditions of air flow rate, air temperature and relative humidity. In this study, the drying rate of corona discharge treatment was significantly greater than that of control under various air flow rate, and was 1.2 to 1.3 times in maximum as fast as that of control. The effect of corona discharge on the drying promotion decreased with increase of air flow rate, and the drying promotion was not affected by the variations of air temperature and humidity. The drying rate of this treatment was equal to that of control whose temperature was 10°C higher and relative humidity was 10% lower than those of this. The electric power consumed by the corona discharge was little, and if agricultural products are dried in large quantities and a transformer loss is reduced, then an energy saving may be expected.View full abstractDownload PDF (1414K) -
Preservation of MelonKazuhiko ITOH, Jun-ich HIMOTO1994 Volume 56 Issue 5 Pages 43-50
Published: 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper describes a method for maintaining the freshness of melons. The freezing temperature of melons is influenced by the harvest stage as well as the region in the melon. The highest freezing temperature was indicated at the top of melons harvested in early stage. After studying freezing temperature, the authors determined that a temperature of -0.5°C was ideal for storage. As for the storage conditions, experiments were performed on unpackaged melons and wrapped melons in 0.03mm thickness polyethylen film with needle-eye holes. From the results of sensory tests, it was found that film with 2 needle-eyes was the best for maintaining freshness over a marketing period of 30 days. It was concluded that the overall scores of sensory tests were influenced by sweetness and aroma of the melons.View full abstractDownload PDF (1306K) -
Physical Properties and Chemical Components of Brown SugarTakayoshi AKINAGA, Hiroshi OKADOME, Yoshihiro KOHDA1994 Volume 56 Issue 5 Pages 51-56
Published: 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSBrown sugar were produced on small islands in Okinawa Prefecture. Qualties of brown sugar produced in Okinawa were unstable, because viscosity, color and moisture content of the brown sugar were varied by the island of their production. Food processing industries are main user of brown sugar who want to use the brown sugar with stable quality. It is necessary to investigate the properties of brown sugar for the improvement of its quality and manufacturing technique. Physical properties of brown sugar produced in all of the manufactories in Okinawa Prefecture were investigated. It was found that the physical properties of sugar were varied with islands. It was suggested that the final concentration methods of sugar cane juice had an influence on the quality of the brown sugar.View full abstractDownload PDF (1072K) -
Seishu TOJO, Kengo WATANABE, Busakazu AI, A. C. CHAO1994 Volume 56 Issue 5 Pages 57-64
Published: 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe shape and the size of drying sample were discussed for determining the drying characteristics of the phytogenic residues. Thinly and cylindrically formed samples brought stable and reappearable results. The drying characteristics curves of cattle excrement, solid bean curd waste and brewer's grain waste have similar properties. They have almost no constant rate drying period, and the decreasing rate drying period begins from the first. The drying process is simulated by the diffusion equation with the boundary condition that the drying rate decreases in proportion to the moisture content of the drying surface.View full abstractDownload PDF (1273K) -
Simplified Calculating Method for Blade StrengthXinYao QIAN, Masasuke ICHIKAWA, Nobutaka ITO1994 Volume 56 Issue 5 Pages 65-72
Published: 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this study, a commercial frost control fan was chosen as one of the propeller fans for agricultural use utilized in open space, and a calculating method for blade design of fan was proposed. Drag and lift affecting on the blade were divided into two component forces acting along the rotating axial direction and the tangential one. The former force was estimated by measuring the air flow velocity in front and behind of fan, and the latter force was determined by measuring the driving torque of fan. Both forces were finally applied to the blade in the form of bending moment. Strength was calculated based on the mechanical model of blade consisting of rectangular plate under the action of bending moment in two vertical directions and centrifugal force in one direction of plate. It was clarified from the result that the commercial fan tested had more structural strength than the required one. The proposed fan with 2.0mm thickness of blade showed almost the same blow performance as the commercial one with 2.5mm thickness of blade.View full abstractDownload PDF (1129K) -
Motion Analysis of Ellipse Planetary GearsMasasuke ICHIKAWA, Isao TAJIRI, Xiu Lun WANG, Michio KATO, Akemi NORO1994 Volume 56 Issue 5 Pages 73-79
Published: 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSRotary type planting mechanism for rice transplanter, which is low in the vibrations comparing with the crank type, is suitable to speed up planting. However, as the inequal velocity planetary gears are used, its vibration cannot be disregarded. In this study, the equation of motion were derived for one adopting for elliptical planetary gears, and the displacement and acceleration of each gears were analyzed theoretically. The results of the theoretical analysis were compared with those from the imageprocessing apparatus, and both were approximately agreed.View full abstractDownload PDF (2642K) -
Main Body of the Robot and its Traverse MethodOsamu SAKAUE1994 Volume 56 Issue 5 Pages 81-88
Published: 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA robotic system for automating vegetable seedling production is developed and tested under the condition of low development costs and the realization of high performance. The main body of the robot and 8 types of its attachment devices are adopted to attain the automation of seeding, cultivating and controlling, transplanting operations.
The main body of the robot is composed of two parts, controlling and driving parts. A programable controller (sequencer) is adopted as a simple base unit of the robot control. Many sensors and actuators are connected to the sequencer through input and output pins for the precision control of operation. A manual controller has buttons for manually starting the operation. It installs 25W motor and moves on the rails tracting various cultivation devices.
The travers device transfers the robot and its devices into another lanes according to the orders from robot controller combined with the limit switches.View full abstractDownload PDF (7100K) -
Kenji HAMADA1994 Volume 56 Issue 5 Pages 89-94
Published: 1994
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2211K)
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