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Volume 54, Issue 4
Displaying 1-14 of 14 articles from this issue
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T. SHIMAMOTO1992 Volume 54 Issue 4 Pages 1-2
Published: 1992
Released on J-STAGE: April 30, 2010
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Controls for Tilling Depth, Load and Attitude Angle of Rotary TillingYi JIANG, Nobuo HONAMI, Shigeo UMEDA1992 Volume 54 Issue 4 Pages 3-10
Published: 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSField experiments by the method of transient response were carried out to evaluate the practical usages of computer control system for the tillage implements mounted on a farm tractor with three point linkage, and the characteristics of the system were analyzed by experimental results. The control system has three process components such as tilling depth, load and attitude angle of the rotary type tillage implement. They were controlled to be optional as a single-mode or a multi-mode. The tilling depth control of this system compensates the depth deviations affected by the pitching of the tractor chassis. The attitude angle was determined by the rolling angle of tractor chassis and the length of lift-rod at right side, and the tilling load was detected by engine speed and upper link force.View full abstractDownload PDF (1368K) -
Application of Crop-Row Detector to a Row Following ControlShun-ichi HATA, Xuejun WEI, Munehiro TAKAI, Kenshi SAKAI1992 Volume 54 Issue 4 Pages 11-18
Published: 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to clarify the running detection characteristics and the adaptability to the steering control of the crop-row detector which had been developed in the previous paper, the crop-row detector was mounted on a computer controlled automatic steering vehicle, and row following tests were conducted in bending crop rows.
As the target crop row is approximated to a straight line in this detecting method, detecting errors are unavoidable at bending points. However, by adopting simple control algorithm that countervail detecting errors and ridge detector using infrared rays, the vehicle followed well along the target rows. Through the improvement of sampling rate and control algorithm so as to delay steering, the steering control will be possible in practical working speed by crop-row detector alone.View full abstractDownload PDF (3388K) -
Analysis of Combustion for a Multicylinder Engine with Dual-fuelNoboru NOGUCHI, Taro SAKAI, Hideo TERAO1992 Volume 54 Issue 4 Pages 19-27
Published: 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to ensure the stable operation of a dual-fuel engine with alcohol, the combustion process and the control system of a dual-fueled tractor engine were evaluated by measuring the cylinder pressures. Compared to the operation with diesel fuel alone, the mean of the maximum combustion pressures increased by 9.5 percent, and the standard deviation of them amounted to 5.7 times with dual-fuel operation. The spectral analysis for the fluctuant components of the maximum combustion pressures was carried out. It became clear that the frequency range of the strongest combustion fluctuation was below 0.2 Cycle/Cycle that was a relative long cycle. It was also concluded that the cause of the combustion fluctuation in this range was the ill-suited control of alcohol flow rate. This problem was able to be solved by adopting the appropriate parameters for a control of alcohol flow rate.View full abstractDownload PDF (1544K) -
Linear Static Strength Analysis for a Toplink and a DrawbarKota MOTOBAYASHI, Masayuki KOIKE, Toshio KONAKA1992 Volume 54 Issue 4 Pages 29-37
Published: 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe purpose of this study is to optimize the shape of members and whole configuration of tractors, applying structural analysis method. Finite element method (FEM) is the main numerical tools for this specific analysis. As a preliminary analysis, a toplink and a drawbar are served for detailed discussion, and linear static analysis is performed with commercialized software, VISA II. A series of strength test for each prototype is also conducted using the universal tension/compression testing apparatus. From the comparison of both numerical analysis and laboratory test, it can be proved that the software is useful for the estimation of various technological aspects including stress distribution, stress concentration, , strain energy density, for further appropriate modification.View full abstractDownload PDF (5692K) -
Mutuality of Chisel Type Subsoiler and Rotary TillerYoshiaki MISAO1992 Volume 54 Issue 4 Pages 39-47
Published: 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe purpose of this paper is to develop a machine to break subsoil mechanically and to clarify parameters which affect fundamental design.
This paper describes the effect of rotary tiller for chisel type subsoiler and the effect of chisel type subsoiler for rotary subsoil breaker.
As a result, it was found that the rotary blades reduced the soil failure resistance of the chisel type subsoiler. C-shaped blades reduced the soil failure resistance of the chisel type subsoiler more than straight blades. The travel reduction of tractor declined when rotary speed was lower, since it made rotary pitch longer.
When the chisel type subsoiler was removed from the machine, the working depth was only 0.1m, because the chain case of the machine prevented from going deep. In this working depth, rotary torque and rotary power were not influenced by the chisel type subsoiler. As the disturbed area of soil decreased when the chisel type subsoiler was removed, both of soil specific torque and specific work increased. Therefore, it is necessary for this trial machine to attach the chisel type subsoiler in order to break subsoil.View full abstractDownload PDF (1263K) -
Dynamics of Threshing PowerMikio UMEDA1992 Volume 54 Issue 4 Pages 49-57
Published: 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis study presents analysis of threshing mechanism for Japanese type head feeding combine. In previous reports, detaching difficulty of rice and stochastic process of threshing were analyzed.
This report describes dynamics of thresher. Head feeding thresher is a dynamic system having hereditary phenomenon and feedback effect. Hence, the dynamics is described in state equation as discrete time system. System parameters are identified on experimental results, and simulations are done by using identified parameters. As a result, simulation results coincided with experimental results, and proved that the proposed method for the thresher was right. It becomes possible to predict dynamic performance of a thresher by using detaching force in tensile tests.View full abstractDownload PDF (1359K) -
Osamu SUMIKAWA, Sumihiko MIYAHARA, Shigeru YOSHIZAKI1992 Volume 54 Issue 4 Pages 59-66
Published: 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe conical-type paddy separator which utilizes a horizontal rotating conical vessel was designed and tested. The influences of the rotating speed of vessel, the conical angle of vessel and the indent shape of vessel inside wall to paddy-brown rice axial segregation were investigated. The result of experiments was expressed in the mixing ratio and both of the mixing parameter and the demixing parameter proposed by Rose were estimated. The result shows that the desired separation was obtained in lower rotation speed but slow in separating process. And it was found that the indent shape did not affect to segregate intrinsically.View full abstractDownload PDF (1208K) -
Quality Evaluation of Brown Rice Using Neural NetworkTakaaki SATAKE, Tatsumi FURUYA, Tohru SHIMOHARA1992 Volume 54 Issue 4 Pages 67-75
Published: 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA simulation of the quality evaluation of brown rice using neural network was carried out as a first step into the development of a neuro-processor for the quality evaluation apparatus. The simulation classifies brown rice to five quality categories based on external appearance according to optical characteristics.
Three different varieties with a mixture of different varieties were used as test samples, and the simulation was conducted by changing the number of hidden units and learning cycles of the back-propagation network. Based on this study, it was clarified that the judgement level of the neural network was nearly equal to that of information processing of an experienced rice quality evaluator, and the use of neural network was effective for quality evaluation based on external appearance of brown rice.View full abstractDownload PDF (1495K) -
Field Test of Digger Screw Type Peanut Harvester and Investigation of the Physical Properties of PeanutsSuryo Busono, Akira ISHIHARA, Masami IWASAKI1992 Volume 54 Issue 4 Pages 77-87
Published: 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSHarvesting of peanuts (Arachis hypogaea) in developing countries commonly depends upon manual harvesting, which is time-consuming and also requires many workers during harvest season. In this paper, a digger screw type peanut harvester was designed and made as a walking tractor attachment, for introduction in developing countries for the purpose of mechanically harvesting peanuts. In this study, peanuts were cultivated in a sandy field after which, a harvester field test and an investigation of the physical properties of peanuts were carried out.
The harvester was able to harvest peanuts with a harvesting rate of pods roughly equal to manual harvesting of 94%. The harvester performance proved adequate for harvesting peanuts in sandy fields; however it still needs improvements in the front part of the conveyor for overcoming sand accumulation in the wet field conditions. Therefore, the harvester will continue to be developed in order to achieve a higher performance.View full abstractDownload PDF (5463K) -
Viscoelastic Characteristics of CrumbYiping WANG, Hiroshi MORISHIMA, Yasuhisa SEO, Yasuyuki SAGARA, Kenji I ...1992 Volume 54 Issue 4 Pages 89-96
Published: 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSViscoelastic characteristics have been investigated for white bread by means of compressive creep test with special reference to their dependences on storage time and temperature as well as moulding method of dough.
An optimum loading condition for crumb samples was established experimentally, and a four-element mechanical model appeared to be appropriate for describing the viscoelastic behavior of crumb. The viscoelastic coefficients of the model were determined by a simple graphic method.
Anisotropy was observed among those coefficients depending on the directions of compression or stress. All of the coefficients increased with increasing storage time, indicating marked change within 12 hours after baking, and with decreasing storage temperature. The coefficients were also affected by the moulding methods of dough.View full abstractDownload PDF (1254K) -
Improvement of the Follow-up Mechanism of the Cross Blocking weeder Fixated the Spike Tooth (Part 1)Structure and Action of the weeder Built as a Trial and the Measuring Method of the Tooth Depth on working by 8mm-CinecameraToshio FURUCHI, Masafumi MITARAI1992 Volume 54 Issue 4 Pages 97-103
Published: 1992
Released on J-STAGE: April 30, 2010
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Shuso KAWAMURA, Motoyasu NATSUGA, Jun-ichi HIMOTO, Juzo MATSUDA, Kazuh ...1992 Volume 54 Issue 4 Pages 105-110
Published: 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1123K) -
S. TAKAMI1992 Volume 54 Issue 4 Pages 111-117
Published: 1992
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2520K)
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