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Volume 52, Issue 4
Displaying 1-13 of 13 articles from this issue
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K. YANO1990 Volume 52 Issue 4 Pages 1-2
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1992K) -
Output Power of Displacer Type Model Built-in RegeneratorTsuguo OKAMOTO, Tae Han KIM, Osamu KITANI1990 Volume 52 Issue 4 Pages 3-10
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSStirling cycle engine has a unique element of regenerator. It is a major attractive point of Stirling cycle engine that it has a possibility of higher thermal efficiency because of its regenerative effect. In case of low pressure operation in working fluid, its aerodynamic friction caused by flowing through regenerator matrix is a main power loss. This report described power output characteristic about a model which had a displacement piston built-in regenerator to get more power through decreasing aerodynamic friction losses. The regenerator was so effective and the engine produced more power than a previous trial-made model without a regenerator.View full abstractDownload PDF (1276K) -
Motion Characteristics and Design Ideas for Lug Trailing SideTadashi KISHIMOTO, Eiji INOUE, Jun SAKAI, Takaaki MATSUO1990 Volume 52 Issue 4 Pages 11-19
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to obtain the design theories of agricultural wheels, interactions between the wheel lug and soil were analyzed through the simulation of wheel lug motion with the equations, obtained in Part I, for locus curves of a wheel axle center and five points which compose conventional lug shapes by a lug trailing side, a lug face, a lug leading side and an undertread face.
In this paper, the lug trailing side is analyzed and reported. The interactions between the lugs and soil are expressed as (i) the two-dimensional acted area and (ii) the horizontal and vertical directions of resultant farce acting on the lug trailing side.
Through these analyses, following results are obtained.
(1) The acted area is varied by not only “travel reduction” and “lift reduction” but also the angle “δ” which decide the arrangement of the lug trailing side.
(2) The lug trailing side is mainly related to produce such external forces as motion resistance and flotation.
These results may be important factors to obtain design theories for the installing angle of the lug trailing side.View full abstractDownload PDF (1229K) -
Effects of Lug Angle and Lug Pitch on Tractive Performance of Cage Wheel in Dry Land and Paddy FieldKittichai TRIRATANASIRICHAI, Akira OIDA, Masashi HONDA1990 Volume 52 Issue 4 Pages 21-27
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAs a running device of a small power tiller for a paddy field operation in South-East Asian countries, a cage wheel is spreading. However, its design criteria are not established yet. In order to find the optimum shape and dimension of cage wheel, the effects of lug angle and lug pitch on a tractive performance were investigated experimentally in a dry sandy field and a paddy field. As the results, the optimum combinations for the tractive efficiency were found; the lug angle of 60° and a narrow pitch of 12.3cm in the sandy field and the lug angle of 45° and the narrow pitch of 12.3cm for the paddy field. A soil blocking was also discussed in this report.View full abstractDownload PDF (3362K) -
Mechanical Model between the Track Roller and the Rubber Crawler, and Driving SimulationEiji INOUE, Jun SAKAI, Shigeki INABA1990 Volume 52 Issue 4 Pages 29-36
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the previous paper, the mechanical interaction between the track rollers and the rubber crawler regarded as a cause of machine vibration has been made clear by experiments. Furthermore, an equation of spring force changing according to location between the two core bars has been led from relationships between the loading forces of the track rollers and the vertical compressing displacements of the rubber crawler.
In this paper, a mechanical model for the rubber crawler system was proposed in order to investigate quantitatively the effect of the machine vibration on the mechanical interaction between the track rollers and the rubber crawler, and equilibrium equations were obtained. Thus, driving simulation on a solid horizontal surface was carried out by using the equilibrium equations so as to estimate machine vibration such as pitch, roll and bounce in case of modifying the number and location arrangement of the track rollers.View full abstractDownload PDF (1134K) -
Design of Vibration-Isolating HandleMasamichi DAIKOKU, Fumitake ISHIKAWA1990 Volume 52 Issue 4 Pages 37-43
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA vibration-isolating handle grip which has a vibration node at its grip point was designed and equipped on a walking type tractor and a tea plucker.
Measurements of hand-transmitted vibration showed that redction of vibration level was achieved in X-and Z-direction, but no effects were observed for Y direction which coincides with the direction of the axis of handle grip.
To actualize the reduction of hand-transmitted vibration in three directions, another handle was designed. In this type two isolating mechanisms were incorporated for a single grip. The principle of each mechanism was the same as in the handle grip of above mentioned trial, but this handle was structured so that two mechanisms were placed in a nearly perpendicular position to each other (‘DI handle’). Specifications of these mechanisms were determined of modal analysis, finite element method and building block approach. Measurements of hand-transmitted vibration of a bush cleaner with ‘DI handle’ revealed that vibration reduction to the intended target in X-, Y-, and Z-direction was nearly attained in the range of engine speed, 6, 500-10, 000rpm.View full abstractDownload PDF (1087K) -
The Methods of Pareto Evaluation and Performance SimulationJun SAKAI, Peng CHEN, Shoichiro YAMANAKA1990 Volume 52 Issue 4 Pages 45-52
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the previous paper, the approximate design on the edge-curve of a rotary blade and the kinematic relationships between rotary blades and soil surface were discussed in order to decide the basic parameters of geometrical motion of rotary blades for the optimum design.
This report deals with the quantification of the performance conditions which must be satisfied as the knowledge source ([knowledge base]) of the expert CAD system and objective functions of optimum blade arrangements. Furthermore, the methods in order to get the set of Pareto optimum arrangements ([data base]) for the efficient design, and their calculation methods of performance simulation will also be discussed.View full abstractDownload PDF (1344K) -
Center of Gravity and Moment of Inertia of Furrow SlicesSoon Goo KWON, Jun SAKAI, Eiji INOUE1990 Volume 52 Issue 4 Pages 53-60
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to perform the optimum functional design of power driven disk plows, it is indispensable to study the behavior of the overturning of furrow slices in the tillage operation.
In this study, theoretical equations were derived in order to explain the relations between optimum gang angle, the radius of the disk, apparent height of tillage residual, actual height of tillage residual, tillage depth, tillage width, center of gravity and moment of inertia of furrow slices.
Basing on these equations, the analysis for the overturning characteristics of the furrow slices will be reported in the following report.View full abstractDownload PDF (3134K) -
Draft Reduction by Pressurized Water InjectionKen ARAYA, Tsukasa MAEKAWA, Satoshi TSUNEMATSU, Rui GAO, He Ping ZHAO1990 Volume 52 Issue 4 Pages 61-66
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSOur goal of the study was to develop an injector which injected liquid fertilizer under pressure at asparagus rhizosphere, we investigated the spread of asparagus root and determined the position where liquid fertilizer should be injected without cutting roots, we conducted the draft force test of the injector at an inside test field injecting pressurized water and tested the draft reduction and the reduction of the total power requirements.
The size of the asparagus rhizosphere was 10-30cm in depth and 50cm in width. Therefore the liquid fertilizer must be injected around this rhizosphere. The draft reduction was affected by operating speed, the flow rate of the injected water and the base draft measured before injecting water. At a good condition, 45 % of the draft and 16% of the power requirements could be reduced.View full abstractDownload PDF (6817K) -
A Good Drying Method of Paddy Rice from the Viewpoint of the Drying Rate and the Crack Generation of RiceKazuo HORIBE, Kenji NAKAGAWA, Takashi TOHJO1990 Volume 52 Issue 4 Pages 67-74
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA drying rate of paddy rice in a solar heat drying plant was studied. Solar-heated air at the upper part of a plastic house was blasted to the surface of the layer of paddy rice which was piled on the floor of the house. The drying rate increased with higher wind velocity, but it was found that the velocity was limited to 6m/s by the crack generation of the paddy rice. The effects of the layer thickness, the number of layer agitations and the heat supplied on the drying rate at a given wind velocity (6m/s) were expressed with a multiple regression equation. Then, the equation positively proposed appropriate conditions for effective operation of the plant in fine days.View full abstractDownload PDF (1290K) -
Detecting Methods of Plant Bodies whose Shapes are Difficult to be Approximated by SphereNaoshi HONDO, Yasunori SHIBANO1990 Volume 52 Issue 4 Pages 75-82
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the Part I and II of this series, a detecting method of a fruit whose shape was able to be approximated by a sphere was investigated. In the method, the distance from visual sensor which was attached to manipulator to fruit was calculated using the moved distance and picture element numbers recognizing object which were obtained before and after manipulator moved, while the manipulator was moving to the object.
In this paper, detecting methods of objects whose shapes were difficult to be approximated by a sphere such as stem, leaf, and long fruit was investigated by computer simulation and experiment using a telescopic arm. From the results, it was observed that the measurement accuracy satisfied the request of agricultural visual sensor.View full abstractDownload PDF (1262K) -
The Method of Predicting Mean Moisture Content and Standard DeviationZuan JIN, Ritsuya YAMASHITA, Kiyokazu GOTO1990 Volume 52 Issue 4 Pages 83-89
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1113K) -
Postharvesting Process and Milling Rice CharacteristicS. J. OMAR, Ritsuya YAMASHITA, Kiyokazu GOTO1990 Volume 52 Issue 4 Pages 91-96
Published: 1990
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (880K)
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