All issues
Volume 67 (2005)
- Issue 6 Pages 1-
- Issue 5 Pages 4-
- Issue 4 Pages 1-
- Issue 3 Pages 3-
- Issue 2 Pages 1-
- Issue 1 Pages 1-
Volume 67, Issue 2
Displaying 1-17 of 17 articles from this issue
- |<
- <
- 1
- >
- >|
-
O. YUKUMOTO2005 Volume 67 Issue 2 Pages 1-2
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2740K) -
Yasuo OHSHITA, Hidemi SAKAMOTO, Jiro WATANABE, Hiroyuki TSUJI, Kenji K ...2005 Volume 67 Issue 2 Pages 4-7
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (5572K) -
Ryuji OTANI2005 Volume 67 Issue 2 Pages 8-11
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (9365K) -
Hisashi HOSOKAWA2005 Volume 67 Issue 2 Pages 12-17
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (13279K) -
O. HYOUDOU2005 Volume 67 Issue 2 Pages 18-19
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (4919K) -
T. NAKAO, [in Japanese]2005 Volume 67 Issue 2 Pages 20-21
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (4793K) -
Estimation of Crop Growth from Image and Crop Growth MapTakashi KATAOKA, Toshihiro KANEKO, Hiroshi OKAMOTO, Masaki TERAWAKI, S ...2005 Volume 67 Issue 2 Pages 37-45
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe method to estimate the crop growth status from the crop rows image, and producing a crop growth map were discussed in this paper. Sugar beets and soybeans were used for this study. The individual vegetation cover area was calculated from the segmented image using CIVE (Color Index of Vegetation Extraction). The relationship between the vegetation cover area and actual measurement of the crop growth (leaf length, root length, plant height and dry mass, ) were analyzed, and the approximation curves were derived. It was concluded that the exponential curves were fitted to the maximum leaf length, the root length and the plant height which represented the “length”, furthermore, the Gompertz curve defined as one of the growth curve was fitted to the dry mass which represented the “mass”. The software which produces the crop growth map from the crop rows images was developed based on these approximation curves.View full abstractDownload PDF (8126K) -
Estimation of Volume Changes, Cross Section Changes and Drying RateTakahiro ORIKASA, Akio TAGAWA, Tosiki NAKAMURA, Mituo IIMOTO2005 Volume 67 Issue 2 Pages 46-52
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA cooking tomato was dried by hot air and microwave. Drying characteristics of materials with shrinkage was studied. Changes of mass, volume, cross section, and temperature were measured. As the results, it was confirmed that the volume was a linear function of the moisture content from the early stage of drying to about 100% (d. b.). In addition, cross section was approximated by a power function of the moisture content based on the relationship between the volume and the moisture content. The mathematical model evaluated to fit the obtained moisture content data was the exponential model. It was determined that drying of cooking tomatoes was in the falling rate period. An Arrhenius type equation was used to relate the drying constant for the cooking tomato to temperature.View full abstractDownload PDF (1003K) -
Estimation of the Thermal Conductivity of Wheat Kernels and Heat Conduction ModelAkio TAGAWA, Yoshiki MURAMATSU, Takamasa KASAI, Mitsuo IIMOTO, Satoshi ...2005 Volume 67 Issue 2 Pages 53-60
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe effective thermal conductivity of the wheat bed was measured by the transient heat flow method using twin probe at selected moisture contents and temperatures. Two kinds of fluid, such as the air and corn oil, were used to fill the gap in the bed. The effects of the moisture content and temperature on the effective thermal conductivity of the wheat bed were investigated. Then, the thermal conductivity of wheat kernels was estimated using the compound model of the series model and the parallel model, and was represented as a function of both moisture content and temperature. In addition, the parameter A, which was the parallel fraction of the compound model, was represented as a function of moisture content, temperature and porosity, and the heat conduction model which was suitable for the prediction of the effective thermal conductivity of wheat bed was proposed.View full abstractDownload PDF (1126K) -
Development of Trajectory ControlPayungsak JUNYUSEN, Tomohiro TAKIGAWA, Masayuki KOIKE, Hideo HASEGAWA, ...2005 Volume 67 Issue 2 Pages 61-69
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper describes the development of a trajectory controller applicable to guidance systems for a trailer towed by an agricultural vehicle. The controller was basically a feed-forward type, in which a trajectory was given as a polynomial function in Cartesian coordinates. The objective was to navigate the trailer to a given destination by tracking the designed trajectory. Simulations using a kinematic model of the tractor-trailer system verified that the feed-forward controller could guide the trailer to given destinations in an errorless condition. However, when even a small calculation error existed, it resulted in significant offsets from the given destinations in the case of backing-up motion. Therefore, a feedback controller designed based on locally linearized system equations around a given trajectory was introduced in order to stabilize the system's backing-up motion, therefore reducing the final offsets. The performances of feedback designed based on pole-placement technique and based on optimal control method were compared. Although the simulation results showed that both feedbacks could stabilize the system, the optimal controller showed better trajectory tracking performance than did the pole-placement controller.View full abstractDownload PDF (1186K) -
Field Experiment of the Developed Trajectory ControlPayungsak JUNYUSEN, Tomohiro TAKIGAWA, Masayuki KOIKE, Hideo HASEGAWA, ...2005 Volume 67 Issue 2 Pages 70-76
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA trajectory controller for a trailer proposed in Part I was tested by using an actual-size autonomous tractor and a trailer. A dead reckoning method was used for estimating the position of the tractor-trailer system. The experiment was conducted on a concrete surface. The experimental results showed that the feed-forward controller could not navigate the trailer to the given destination in backward movement, while the proposed feedback control could stabilize the system and guide it to that destination successfully. Performance of the feedbacks designed by the pole-placement technique and the optimal control method were compared. No significant difference in the final positional error was observed between the two feedback types tested. However, the maximum displacements in position that occurred during backward parallel travel from the origin to (8, 3)m in Cartesian coordinates were 14cm using the pole-placement controller and 9cm using the optimal controller. These results indicated that the feedback equipped with the optimal control showed the better trajectory tracking performance.View full abstractDownload PDF (3053K) -
Wanrat ABDULLAKASIM, Masayuki KOIKE, Tomohiro TAKIGAWA, Hideo HASEGAWA ...2005 Volume 67 Issue 2 Pages 77-85
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis study attempted to develop a method to predict the degree of soil compactness in terms of bulk density, which varies as soil is subjected to vehicular loads. In situ experiments were carried out by measuring the stresses in soil underneath operating tractors using stress state transducers. The soil at the test site was sampled and investigated in terms of its pertinent properties. A neural network model was then developed to memorize the functional relationships that govern the changes in bulk density as a function of soil properties and stress parameters. The results demonstrated that the model could predict bulk density by a root mean squared error of 4.28% with a correlation coefficient of 0.838. Furthermore, the sensitivity analysis was performed to prioritize the significance of each input parameter presented to the network by adopting a method called the Relative Strength of Effect (RSE). The results indicated that both normal and shear stresses were the dominant factors influencing soil compaction. Besides, susceptibility to compaction was found to be dependent mainly on the initial bulk density and the moisture content of soil.View full abstractDownload PDF (5760K) -
Ryo SUGIURA, Noboru NOGUCHI, Kazunobu ISHII, Hideo TERAO2005 Volume 67 Issue 2 Pages 86-92
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWhen an unmanned helicopter flies far from an operator, it is very difficult for the operator to recognize the position, posture and working progress of the helicopter. One of the solutions is to develop a monitoring system enables the operator to grasp the state of flying helicopter. The objective of this study is to develop the monitoring system to support the remote sensing using an unmanned helicopter. The radio transmitter was adopted to transmit the position and posture data from the helicopter to the base station on the ground. The base station was composed of the radio receiver and a note type PC. The received helicopter information was visually displayed on the developed software. In addition to the position and posture's display, the software also offers the working progress because the sensed field area can be calculated by the position and posture of the helicopter. Furthermore, it is possible to view the helicopter's condition from the various view points by applying 3-dimensional graphics.View full abstractDownload PDF (5013K) -
Yasumasa ISHIDA, Tsuguo OKAMOTO, Kenji IMOU, Yutaka KAIZU2005 Volume 67 Issue 2 Pages 93-99
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAn experimental study on water jet cutting of plants was conducted to develop a new method of weeding without chemicals. Instead of weeds, rice seedlings were used in the experiments to enable constant experimental conditions to be created. The experimental parameters were pump pressure, distance to the object, nozzle diameter, angle between the water jet and the seedlings, and cutting speed. The best cutting result was obtained with a nozzle of 0.4mm diameter and the highest experimental pump pressure. It was found that the water jet had a high cutting capability at around the point where the beam began to diffuse. The appropriate angle between the water jet and the seedlings was about 45 degrees. Cutting speed had little effect on the results in the conditions of these experiments.View full abstractDownload PDF (5543K) -
Akira YANO, Kazuo TSUCHIYA, Kazuo NISHI, Tomoyuki MORIYAMA, Osamu IDE, ...2005 Volume 67 Issue 2 Pages 100-110
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis study developed a power saving greenhouse side window controller driven by photovoltaic energy. Controller operation was tested in a greenhouse during two periods: from 26 April to 26 May 2003 (period A) and from 2 July to 3 August 2003 (period B). Side window opening and shutting temperatures were set at 25°C and 20°C during period A and at 30°C and 25°C during period B. Weather during period A was mostly fair. The daytime temperatures were often higher than 30°C. In contrast, insolation during period B was only 64% that of period A because of the unusually cold summer with less sunshine. The side window controller was moved using power from a combination of an amorphous silicone photovoltaic module of 0.078m2 with rated maximum power of 3.2W and a battery capacity of 28 Ah in 5 hour rate (12V). In both periods A and B, the greenhouse side windows were well operated according to the greenhouse temperature, without outage. The daytime interior temperatures of the greenhouse were concentrated in the range of the side window opening and shutting temperature by operation of the side windows.View full abstractDownload PDF (1373K) -
Wheel DerailmentShoichi YUKI, Jun YAMASHITA, Seiichi ARIMA, Toshinori SAKAI, Kazunobu ...2005 Volume 67 Issue 2 Pages 111-120
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this paper, to introduce the gantry to strawberry house, the permissible limit of gauge irregularity for gantry was clarified. In this experiment, the lateral and wheel loads acting on the track were measured. Both-flanged wheel with flange angle 90° that was conventionally used could travel at a gauge irregularity of 16mm because of side-frame deformation. Side-flanged wheel with flange angle 65.3° could travel along the rail with the gauge irregularity until it finally got derailed at a gauge irregularity of 12mm. This experimental value agreed well with the gauge irregularity value of 11.7mm computed from the theoretical derailment quotient 1.02. In addition, the power consumption of the driving motor with side-flanged wheel was proven to be low. Consequently side flanged wheel was suitable for practical use.View full abstractDownload PDF (1347K) -
Work Efficiency of the Developed Harrow and Influence of Puddling on the Accuracy of Rice TransplantingTakashi GOTOH, Mitsuhiro HORIO, Tomohiko ICHIKAWA, Katsunari NAGAYA, Y ...2005 Volume 67 Issue 2 Pages 121-129
Published: March 01, 2005
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSPrototypes of high-speed rotary harrows and conventional rotary harrows were employed to investigate the work efficiency and the accuracy of rice transplanting after puddling. The following results were obtained. (1) When the developed harrows worked at 24 to 30% higher forward speed than the conventional harrows, effective field capacity of the developed harrows was 21 to 22% larger and the fuel consumption of the developed harrows was 13 to 15% lower than those of the conventional harrows. (2) The number of exposed stubble after puddling, the rate of surfaced seedling and buried seedling after rice transplanting in sandy loam paddy field were almost equal to those by the conventional harrows in the test sections by the developed harrows operating at the same forward speed as the conventional harrows. (3) The accuracy of puddling and rice transplanting was almost the same as those by the conventional harrows in the test sections by the developed harrows operating at 20 to 30% higher forward speed and at one less pass than the conventional harrows.View full abstractDownload PDF (3765K)
- |<
- <
- 1
- >
- >|