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Volume 53, Issue 3
Displaying 1-16 of 16 articles from this issue
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[in Japanese], [in Japanese]1991 Volume 53 Issue 3 Pages 1
Published: 1991
Released on J-STAGE: April 30, 2010
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[in Japanese]1991 Volume 53 Issue 3 Pages 2
Published: 1991
Released on J-STAGE: April 30, 2010
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H. HORIHATA1991 Volume 53 Issue 3 Pages 3-4
Published: 1991
Released on J-STAGE: April 30, 2010
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Manufacture of Test Tractor and its Tractive PerformanceNobuhiro TANO, Minoru YAMAZAKI, Takashi MEGA, Hiroshi SHIMIZU1991 Volume 53 Issue 3 Pages 5-13
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to find the optimum speed ratio between front and rear wheel of four-wheel drive tractor, a test tractor equipped with a hydrostatic transmission at the front wheel drive system was manufactured by way of trial. Using this tractor, various traction performance tests were done on a concrete road and rice stubble field. In these tests, a peripheral speed ratio of front to rear wheel was changed from 0.8 to 1.2. From the test results, the effect of front wheel assist was notable when the tractor was operated at the peripheral speed ratio of about 1.1 showing lower slippage and higher drawbar horse power than at the peripheral speed ratio of 1.03 to 1.05, which is seen in ordinary tractors on the market.View full abstractDownload PDF (3436K) -
Introduction of State Equations and Dynamic CharacteristicShu-huai ZHANG, Hideo TERAO, Masahiro UENO, Kohichi FUJITA1991 Volume 53 Issue 3 Pages 15-23
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSBy linearizing the non-linear simultaneous equations of Part III in the vicinity of an equilibrium state, the state equations of tractor-trailer combinations (TTC) was derived. To investigate the verity of the state equations, the theoretical results of the step and impulse responses were compared with tested result of the ones. The controllability, observability and stability of TTC control system were investigated, too. To estimate all of the state variables including the inaccessible ones, a state observer was designed. The conclusions were as follows: (1) TTC control system is controllable and observable. (2) In the case of backing, high speed and steering motions, TTC control system is instable. (3) The tested results of the step and impulse responses agree well with the theoretical results, (4) All of the state variables can be estimated by state observer.View full abstractDownload PDF (1288K) -
Motion Characteristics and Design Ideas far Lug Face and Lug Leading SideTadashi KISHIMOTO, Jun SAKAI, Eiji INOUE, Takaaki MATSUO1991 Volume 53 Issue 3 Pages 25-34
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this paper as the second part on analyses of interactions between wheel lugs and soil, two of lug elements, a lug face and a lug leading side, are analyzed and reported. The interactions are expressed as (i) two-dimensional acted area and (ii) the horizontal and vertical component directions of resultant force acting on each element by the same method as in Part II.
Through these analyses, it is found that the elements are related to external forces acting on the wheel as follows;
(1) The lug face is related to producing not only motion resistance, flotation but also traction.
(2) The lug leading side is mainly related to producing such external forces as traction and flotatiot.
These results may be important factors to obtain design theories for the width of the lug face and the installing angle of the lug leading side.View full abstractDownload PDF (1291K) -
The Method of Preferential Optimum Evaluation and Building of the Expert CAD SystemPeng CHEN, Jun SAKAI, Ryozo NOGUCHI1991 Volume 53 Issue 3 Pages 35-45
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this paper, a method of decision making is reported in which a preferential optimum arrangement can be selected from the “data base of Pareto optimum arrangements” obtained by using the multi-stage decision method. At first, the method for preferential evaluation by a constellation graph is proposed, and the theoretical foundation of this method is discussed by formulating the value function of decision making. Then next, the technique is also investigated by which the weights of the performance factors can be quantified in dialog style.
Furthermore, according to the optimum design theoretics on rotary shaft and the method of building the expert CAD system established in this study, the outline of the expert CAD system for decision making in rotary shaft design is also reported.View full abstractDownload PDF (4107K) -
Characteristics of Soil Reaction onto a Lug of Cage WheelKittichai TRIRATANASIRICHAI, Akira OIDA1991 Volume 53 Issue 3 Pages 47-56
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe characteristics of soil reaction forces onto a lug of cage wheel with double rims are presented in this paper, analyzing measured data in actual sandy and paddy fields. Radial and tangential forces for the rim, which acted to one lug, and moments by the forces were measured by extended octagonal ring transducers, which were fixed on left and right cage wheels. The resulting pull and lift forces, which were developed by one lug, depended on a number of factors including: soil type, wheel sinkage, lug angle and so on. Larger lug angle resulted in sharp distributions of pull and lift forces owing to the shorter contact length due to the smaller sinkage. The maximum values of pull and lift forces of one lug had a linear relationship with the slippage. The resistance loss of the cage wheel, which was calculated by integrating and accumulating horizontal components of lug forces and by comparing with measured pull, was the minimum at 45 degrees lug angle in paddy field and at 60 degree lug angle in sandy field. These lug angles were the same as the optimum lug angle from the viewpoint of tractive efficiency as reported in Part 1 of this study.View full abstractDownload PDF (1377K) -
Soil Failure and Soil Volume Change at Different Moisture ContentsNiyamapa Tanya1991 Volume 53 Issue 3 Pages 57-66
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe effect of moisture content and cell pressure on soil failure and soil volume change were studied in this paper. These effects were determined by an undrained quasi-static triaxial compression test. Unsaturated silty loam and sandy loam soils were used for testing. Test results showed two types of soil failures namely plastic flow and brittle failure. The failures were found to be a strong function of soil moisture contents and cell pressures. In brittle failure, two behaviours were observed during the tests, general shear failure and fragmentation.
The soil volume change depended upon the relative values of moisture contents and cell pressures. It was observed that soil specimens were broken and expanded in volume during fragmentation than the general failure. The amount of energy used in breaking soil specimens were found to be a function of soil moisture contents. It clearly showed the optimum range of moisture contents for minimum energy requirement during soil failursView full abstractDownload PDF (1311K) -
Solenoid Operated Seed MeteringIsaac Kaaria INOTI, Kiyoshi NAMIKAWA1991 Volume 53 Issue 3 Pages 67-73
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper describes the development of an electronically controlled metering device for metering soybean seeds (and other similar sized grains). The system was built around a high performance solenoid valve, a data acquisition and control unit, and a seed feeder. Performance tests were conducted, using soybean seeds to obtain within-the-row spacing data. The control system was mainly used to control solenoid valve operation so that metering performance for seed dropping intervals between 30 to 210ms could be determined. Laboratory test results showed that the control system maintained satisfactory metering accuracy, enhanced the ease of varying planting parameters, and capable of improving the overall planter efficiency.View full abstractDownload PDF (969K) -
Effect of Temperature and Packaging Method on the Quality of Chinese YamKazunori HIRONAKA, Ken'ichi ISHIBASHI1991 Volume 53 Issue 3 Pages 75-83
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis study was undertaken to evaluate the effect of storage temperture and packaging method on the quality of Chinese yam. Chinese yams were stored for 4 months under four storage temperature (1, 3, 7 and 10°C) and three packaging methods (Polyethylene film package, no package and sawdust package). Yams stored at 7 and 10°C began to show sprouting on the 33rd day of storage. However, no sprouting was seen in the yams stored at 1 and 3°C. Yams stored at 1°C had lower viscosity and rigidity values than those at the other temperatures. The extent of the decrease of spinnability of the yams stored at 3°C was not as large as those at other storage temperatures. Concerning packaging method, Polyethylen film package was very effective in preventing weight loss of the yam during storage. The sawdust package treatment showed a marked decrease in viscosity and rigidity among three packaging methods during storage. From the mentioned results, it could be concluded that storage at 3°C with polyethylene film was the most suitable for the preservation of Chinese yam.View full abstractDownload PDF (4874K) -
Hitoshi KANAZAWA1991 Volume 53 Issue 3 Pages 85-92
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe aim of this study is to investigate the applicability of sonic position sensing system in field. The linearity, stability and the performance in noisy (-85dB) circumstances of the system were investigated in one-directional test. The two-dimensional position sencing error in 24m×36m field was less than 25cm. Sonic position sensing method was found to be useful for agricultural machinery control.View full abstractDownload PDF (1070K) -
Effects of Impact Loading on Transient Unsaturated Soil CompactionAshenafi T. Abebe, M. Yamazaki, A. Oida, H. Nakashima1991 Volume 53 Issue 3 Pages 93-102
Published: 1991
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAgricultural soils are exposed to transient machinery loads during traction or soil working processes. Mechanically induced soil compaction is dynamic in behavior and its major cause is vehicular load. This paper presents an experimental study on the dynamic response of unsaturated sandy loam soil to confined undrained impact compression that characterizes mechanism of dynamics of soil compaction. A 5∅×10cm cylindrical soil specimen was confined with 50kPa and compacted with a falling of mass, generating impact speed of 1.5-2.8m/s and impact stress of 50-150kPa, The stress wave propagation and the duration of the resistance of soil to impact compression were about 200μs and 2ms, respectively. The volumetric strain of 4-9% was attained as the result of confined impact compression.View full abstractDownload PDF (5869K) -
Application for the Tobacco CultureNobuyoshi HATTORI, Yasuhiko MIYAKE, Hideyuki TOMITA1991 Volume 53 Issue 3 Pages 103-108
Published: 1991
Released on J-STAGE: April 30, 2010
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Karl Th. RENIUS, [in Japanese]1991 Volume 53 Issue 3 Pages 109-115
Published: 1991
Released on J-STAGE: April 30, 2010
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T. KOJIMA1991 Volume 53 Issue 3 Pages 117-122
Published: 1991
Released on J-STAGE: April 30, 2010
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