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Volume 70, Issue 5
Displaying 1-14 of 14 articles from this issue
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K. TANIWAKI2008 Volume 70 Issue 5 Pages 1-2
Published: September 01, 2008
Released on J-STAGE: November 01, 2012
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Osamu TOKUMOTO, Agung HENDRIADI, Teguh Wikan WIDODO2008 Volume 70 Issue 5 Pages 4-9
Published: September 01, 2008
Released on J-STAGE: November 01, 2012
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Tsutomu DEI2008 Volume 70 Issue 5 Pages 10-13
Published: September 01, 2008
Released on J-STAGE: November 01, 2012
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T. OOTA2008 Volume 70 Issue 5 Pages 14-15
Published: September 01, 2008
Released on J-STAGE: November 01, 2012
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K. GOTOH, K. IMAMURA2008 Volume 70 Issue 5 Pages 16-17
Published: September 01, 2008
Released on J-STAGE: November 01, 2012
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2008 Volume 70 Issue 5 Pages 18-27
Published: September 01, 2008
Released on J-STAGE: November 01, 2012
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Muneshi MITSUOKA, Shigeki INABA, Eiji INOUE, Takashi FUKUSHIMA, Sadahi ...2008 Volume 70 Issue 5 Pages 41-47
Published: September 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSIn this study, a dynamic model for agricultural rubber crawler vehicles equipped with movable track rollers was constructed by considering pitch motion in order to clarify their vibration characteristics. Further, motion equations were formulated from this model. Driving experiments were conducted for an agricultural rubber crawler vehicle equipped with movable track rollers in order to investigate its vibration characteristics and verify the validity of the analysis based on these motion equations. Furthermore, the measured and simulated results were compared with those for a conventional rubber crawler vehicle, in which the track rollers are fixed on the track frame. The results indicated that in both cases, the vibration characteristics were different, although the location arrangements of the track rollers were similar.View full abstractDownload PDF (3266K) -
Investigation of the Nonlinear Interaction Between a Track Roller and an Agricultural Rubber CrawlerMuneshi MITSUOKA, Shigeki INABA, Eiji INOUE, Takashi FUKUSHIMA, Takash ...2008 Volume 70 Issue 5 Pages 48-54
Published: September 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSIn this study, the static and dynamic interactions between a track roller and a rubber crawler were investigated. The dynamic spring constants and the viscous damping coefficients of the rubber crawler were measured by using the dynamic viscoelastic measuring system with a varying range of frequency and preload.
The results indicated that the dynamic interactive relationships between the dynamic spring force of the track roller and the displacement of the rubber crawler showed hardening nonlinearity near the middle portion between two lugs, while around the lugs (core bars) were linear with a tendency similar to static interaction. Furthermore, the higher the exciting frequency, the larger was the dynamic spring constant, while the viscous damping coefficient decreased.View full abstractDownload PDF (845K) -
Changes in Physicochemical Properties of Milled Rice during StorageMio YOKOE, Shuso KAWAMURA2008 Volume 70 Issue 5 Pages 55-62
Published: September 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSAn experiment on milled rice storage was conducted to investigate storage properties for determining shelf life (best before date), Conventional milled rice and rinse-free rice samples were stored in incubators controlled at -20°C, -5°C, 5°C, 15°C or 25°C for one year. The storage experiment was repeated at temperatures of -20°C, 5°C, 15°C, 20°C or 25°C for six months. It was found that the higher the storage temperature was, the greater the deterioration in free fat acidity was. However, there was very little deterioration after one year of storage in various physicochemical properties of rice stored at 15°C or lower temperatures. The quality of rice at the beginning of storage had great effects on storage properties such as stickiness, hardness and appearance of cooked rice. Rice that is of good quality at the beginning of storage had good storage properties.View full abstractDownload PDF (1317K) -
Ariho UENO, Shu-huai ZHANG, Teruo TAKAHASHI2008 Volume 70 Issue 5 Pages 63-68
Published: September 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSThis research describes a nondestructive method for detecting bruised apple tissues before a change in tissue color. The spectral reflectance of bruised and sound apple tissues was measured. The differences and tendencies were statistically analyzed. Significant difference at the 1% level between the bruised and sound tissues indicated by t-test was confirmed by the regression slope of the spectral reflectances in the 738-812nm wavelength region. These results demonstrate that the slope of the regression line could be very valuable for distinguishing the bruised and sound tissues of apple fruits.View full abstractDownload PDF (3398K) -
Hay bale detection using an omnidirectional cameraRahman FARROKHI TEIMOURLOU, Noboru NOGUCHI2008 Volume 70 Issue 5 Pages 69-76
Published: September 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSIn path planning of autonomous agricultural vehicles, obstacles detection and identification, and taking appropriate collision avoidance measures are critical for safe operation. As such, the objectives of this research are to detect the hay bales in an image, and to estimate the position of a hay bale with an omnidirectional camera. Approximately 90% of bales within the 40-m maximum detection distance could be identified using developed image processing technique. Then, the estimation of hay bale's position was further improved based on local discriminate analysis. The estimation of the hay bales distance from the camera generated a root mean squares (RMS) error of 1.1m; it was concluded that this accuracy was more than sufficient to enable the autonomous navigation of a robot tractor in the meadow.View full abstractDownload PDF (15053K) -
Yuichi KOBAYASHI, Wataru IIJIMA, Hitoshi KATO, Kazuhiro TAKEKURA, Ken ...2008 Volume 70 Issue 5 Pages 77-82
Published: September 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSPellet fuels were produced from grounded sunflower oil cake using a pelletizer.
The values of the length, hardness, and powdery characteristics of dried pellets depend on the initial water content of the oil cake. The appropriate values of water contents were 20% w. b.
Oil cake pellets have 20.99MJ/kg higher caloric value and contain 6.07% ash which is within the standard range of wood pellets.
ombustion experiments using a commercial pellet stove demonstrate that oil cake pellets burn as well as wood pellets.
Oil cake pellets are useful as a fuel alternative to wood pellets.View full abstractDownload PDF (910K) -
Koichi SHOJI, Yuji YAMAGUCHI, Tsuneo KAWAMURA, Kazuto ANDO2008 Volume 70 Issue 5 Pages 83-91
Published: September 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSMicro-elevation maps were generated by mounting a single-carrier RTK-GPS receiver on a combine harvester, and were compared with others surveyed with a laser level. Under a favorable satellite arrangement (PDOP<2.0), minimum standard errors were 5.1mm in a concrete open space and 7.7mm in a paddy field after harvest. Periodical fluctuation was observed as PDOP increased, resulting in the maximum standard error of 16.9mm and 13.6mm, respectively (PDOP≈3.0). The moving average of the elevations taken more broadly across the paths of the vehicle lowered the standard errors by up to 47% in the open space and 34% in the paddy fields. However, loss of information of micro-topography of the fields should be taken into account in the paddy fields. The ratio of standard error to altitudinal variation was considered as a criterion, and the optimal area of the moving average was 6.0m×6.0m to minimize it. In the open space, renewing a reference elevation every 3 to 4 minutes compensated for the fluctuation and lowered the standard error by 17% while a high PDOP was observed.View full abstractDownload PDF (12035K) -
Jun YOKOBORI, Katsuhisa NIWA, Noboru NOGUCHI2008 Volume 70 Issue 5 Pages 92-100
Published: September 01, 2008
Released on J-STAGE: November 01, 2012
JOURNAL FREE ACCESSThis study aims at improving the sensing efficiency of field information by reducing the number of required images. Single whole field image by tilted image sensor is the best method. The possibility of image acquisition by changing the tilt angle of sensor was therefore investigated. The acquired images were transformed to ground coordinates with a projective transformation. Then, the wheat logging map was generated as one of crop growth maps.
The results suggested that the adopted projective transformation using four corner points on the field was effective for geometrical transformation. It was concluded that the wheat logging map generated by the discriminate function highly coincided with the actual wheat logging situation.View full abstractDownload PDF (11442K)
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