All issues
Volume 61, Issue 4
Displaying 1-19 of 19 articles from this issue
- |<
- <
- 1
- >
- >|
-
K. KUWANA1999 Volume 61 Issue 4 Pages 1-2
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2125K) -
Mikio UMEDA1999 Volume 61 Issue 4 Pages 4-11
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (4120K) -
Tatsuya INAMURA1999 Volume 61 Issue 4 Pages 12-13
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (3312K) -
Takashi KOSAKI1999 Volume 61 Issue 4 Pages 13-14
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (3498K) -
Youichi SIHBATA1999 Volume 61 Issue 4 Pages 14-19
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (9709K) -
Studies on the Field Management System, and Farm Implement Control System using Autonomous Vehicle for Large-Scale FarmingYoshiyuki HARA1999 Volume 61 Issue 4 Pages 19-23
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2240K) -
M. HORIO1999 Volume 61 Issue 4 Pages 25-26
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1660K) -
S. EGAMI1999 Volume 61 Issue 4 Pages 27-28
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1954K) -
Masami UENO, Takashi OKAYASU, Koichi HASHIGUCHI, Takeshi SHIKANAI, Mas ...1999 Volume 61 Issue 4 Pages 75-84
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDrawbar pull of a traveling wheel varies with certain amplitude in a stationary state, even though the traveling speed is so slow that the inertia force is negligible. Averaged values of the mechanical quantities are used as characteristic values of traveling performance, and such small fluctuation is usually neglected. The properties of fluctuation of drawbar pull and so on are mechanically examined by the traveling tests of a rigid wheel on sandy ground so that the fluctuation is important phenomena to clarify the traveling performance and to control machine operations. A soil reaction vector acted on the wheel moves back and forth on the contact surface with some extent of width. It is clarified that such behavior is similar to the walking motion of a man's leg. The horizontal distance from the intersecting point of the vector to the vertical center line of the shaft increases with the decrease of drawbar pull, conversely decreases with the increase of drawbar pull. There is a negative correlation between the horizontal distance and the drawbar pull. It is shown that the phenomena can be represented by the balance equation of torque.View full abstractDownload PDF (1400K) -
Expansion for Forward and Backward ManeuversRyo Torisu, Jun-ichi Takeda, Ken-ichi Tanaka, Joe Imae1999 Volume 61 Issue 4 Pages 85-93
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSGenerally, optimal time/path problems of tractors on the headland are discussed from Bang-Bang principle perspective. But actual tractor behavior when turning is influenced by delay-time of operator response or lag-time of steering mechanism produced by inertia. This paper has two objectives: one is to propose a new approach that will estimate the human operator and vehicle inertia properties for optimal time/path problem at the headland based on the results of part one. The other is to investigate turning behavior of the car-like-robots at the headland. The results obtained by simulations are in good agreement with the field tests. Thus the developed model and the proposed method can be adopted for agricultural car-like-robots such as a autopilot tractor.View full abstractDownload PDF (1315K) -
Desrial, Nobutaka ITO1999 Volume 61 Issue 4 Pages 95-102
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSRubber tracks have generally straight grousers which are arranged perpendicularly or at an angle to its direction of travel for better traction and soil removal. The new concept of circular grousers, together with the application of a pivot turn and the ability to control the contact length proved to be successful in reducing turning motion resistance as well as attaining better traction. This paper discusses the method for determining the specification of rubber track with circular grousers, while taking in account tractive performance and track sinkage on controlled pivot turns. The calculated track dimensions were validated by comparing them to the track dimensions of commercial combine harvesters. It was revealed that the calculated track dimensions were closely related to commercial ones.View full abstractDownload PDF (983K) -
Keiich INOUE, Kannji OOTSUKA, Mitsuho SUGIMOTO, Noriyuki MURAKAMI, Wen ...1999 Volume 61 Issue 4 Pages 103-113
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWe developed sensor fusion techniques combining a gyrocompass and DGPS by the method of Kalman filter for automatic guidance system of an autonomous tractor. Drift or offset of a gyrocompass or heading error is automatically estimated and the accuracy of direction and position of a tractor is improved by the method of Kalman filter, which makes a volume condition of the error of direction and speed data in addition to a position vector using the position data of DGPS as a observation values. We carried out automatic rotary tilling work by the autonomous tractor in the field by using this method. The offset of the optical fiber gyro was correctly estimated and the accuracy of the position estimated was improved over the accuracy of DGPS and able to guide the autonomy along the target line in the field.View full abstractDownload PDF (4786K) -
Development of cutting devicesYoshifumi NISHIURA, Nobuo HONAMI, Tomoaki TAIRA1999 Volume 61 Issue 4 Pages 115-124
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn part 1 of this study, we showed that the Plug-in method was effective as a new grafting method based on the results of grafting experiments with tomato (Lycopersicon esculentum Mill.). We also found that it was important to process the seedlings with high accuracy and to make them smooth based on the results of cutting experiments using apparatuses for shaping the scion and stock. Therefore, in this paper we describe new apparatuses for shaping the scion and stock that can make them more accurately and smoother than could the previous apparatuses, and report on its performance.View full abstractDownload PDF (9862K) -
Ichiro WADA, Toshio KAWANO, Naomi MAEDA, Makoto KAWAKAMI1999 Volume 61 Issue 4 Pages 125-132
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo obtain high quality rice husk ash (RHA), the rising burning temperature at fire place should be controlled low enough to avoid decreasing specific surface area of amorphous phase of silica in RHA, and the duration of incineration should be long enough to burn out fixed carbon. In this study, a newly stirring furnace for producing high quality RHA is developed. This furnace has a stirrer in its center and the rice husk was incinerated while stirred by horizontally rotated stirrer with continuous air supply from it. It is clarified that highly reactive RHA can be obtained by incinerating rice husk under certain feeding rate and rotation speed. These RHA have higher specific surface area with less carbon as compared with those obtained by conventional furnaces.View full abstractDownload PDF (1292K) -
Choung Keun Lee, Michihisa IIDA, Mikio UMEDA, Toshikazu KAHO1999 Volume 61 Issue 4 Pages 133-140
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSUsing mapping techniques, spatial variability of yields in grain and straw for rice plant was investigated over a 0.5ha paddy field on the Experimental Farm, Kyoto University, Japan. Test plant was Oryza sativa L., cv. MINAMI-HIKARI, a high-yield variety. Grid sampling was conducted with three rectangular spacings: 1.2m width and 1m length, 6m width and 5m length, and 12m width and 10m length, in order to take account of the grid size effects. In 1.2m×1m grid spacing yield variations resulted in 5.5 to 9.7t/ha for grain dry mass and 6.2 to 18.0t/ha for straw dry mass. Experimental semivariograms revealed the spatial dependency of yields with respect to grain and straw.View full abstractDownload PDF (2581K) -
Improvement of SFSW with Consideration of Daily Rainfall AmountI WAYAN ASTIKA, Akira SASAO, Sakae SHIBUSAWA, Kenshi SAKAI1999 Volume 61 Issue 4 Pages 141-150
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe SFSW developed in the previous paper was improved by incorporating the possibility of working on rainy days and the days after rainy days. Five levels of daily rainfall characterizing the possibility of working were introduced, replacing the original two levels of weather condition: rain and bright.
A new algorithm, named New SFSW (NSFSW), was applied to sugarcane harvesting scheduling problems, which were also solved with SFSW as reported in the previous paper. The optimization method was modified to reduce the time required for optimization. With the consideration of daily rainfall amount determining the possibility of working on rainy days and the following days, the calculated costs and optimum schedules decided by NSFSW were considerably different from those decided by SFSW.View full abstractDownload PDF (1402K) -
Temperature and Humidity Control of Silkworm Rearing RoomYankun PENG, Masanobu OHURA1999 Volume 61 Issue 4 Pages 151-158
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn rearing at a factory, the development of a system for control of the rearing environment is an important. In this study, we evaluated measurement control system, consisting of a personal computer, temperature and humidity sensors, recorder, and signal conversion interface, for a silkworm rearing room. With the system, it was possible to set the optimum temperature and humidity automatically according to a schedule (hour and day) as well as display the indoor and outdoor temperature and humidity on the CRT screen. In addition, the deviation between a target value and the measured value was decreased by the temperature and humidity feedback control based on the measured data on the silkworm rearing position.View full abstractDownload PDF (7883K) -
Douglas SHITANDA, Yoshio NISHIYAMA, Daniel MUTULI1999 Volume 61 Issue 4 Pages 159-165
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSProperties of crude oil from four indigenous oilseeds in Africa (Kenya) were determined and their potential use as fuel, lubricants, hydraulic fluids, and brake fluids were evaluated. The oils were extracted chemically and mechanically using petroleum ether and ram press respectively. The properties determined included density which decreased linearly with increase in temperature, kinematic viscosity which decreased exponentially with increase in temperature, viscosity index, calorific value, ash content, flash point, specific heat, thermal conductivity, and pH value. Empirical equations were derived for the change of density and kinematic viscosity with temperature. Methods of extraction had significant effect on the ash content and flash point of the oils. The values obtained were compared to those of diesel and sunflower oil.View full abstractDownload PDF (2469K) -
Takuo KOKURYU, Sakae SHIBUSAWA, Takuo MIYASHITA, Akira SASAO1999 Volume 61 Issue 4 Pages 167-168
Published: July 01, 1999
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (312K)
- |<
- <
- 1
- >
- >|