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Study on Tension Measurement of Rubber Crawler Focusing on Its Inner Structure
( Takashi Fukushima ),( Muneshi Mitsuoka ),( Eiji Inoue ),( Kunio Sato ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Agricultural crawler tractors that have adopted rubber crawlers are common because of the reduced effects of machine and road surface vibrations. This study targets the oscillating crawler unit that contains a special mechanism in which the unit oscillates around a hitch point that is set separately from the drive axis of the drive sprocket. Half-tracked tractors equipped with an oscillating crawler units have better stability on uneven ground than wheel type tractors, which respond directly to a concavo-convex surface. However, the crawler tension fluctuates according to the variation in the perimeter of the crawler unit when this unit travels on a concavo-convex surface because the hitch point of the oscillating frame is set separately from the drive axis of the drive sprocket. It is suggested that this fluctuation in the crawler tension influences driving performance. Moreover, driving performance factors (e.g., frame oscillation, traction, and drive torque) might be optimized by actively controlling the crawler tension. It is also generally known that some problems such as damage to and dropping of the rubber crawler have arisen during operation because of soil and stones sticking to the track rollers and the tension fluctuations of the crawler. These problems might be also obviated by actively controlling the crawler tension. We have proposed a driving simulation model for half-tracked tractors that has the ability to express the fluctuation in the crawler tension. However, this driving simulation is not verified, because it is very difficult to measure the crawler tension while driving, and little has been reported on the measurement of crawler tension. Therefore, this study aims to propose a measurement method for crawler tension fluctuation, which focuses on the inner structure of the rubber crawler. A fundamental experiment with a test piece cut out of a rubber crawler was carried out to evaluate the effectiveness of the proposed tension measurement, which uses steel cords arranged inner the rubber crawler. In conclusion, it has been demonstrated the possibility for stable measurement of crawler tension.
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EFFECT OF Na₂O ADDITION ON MAGNETIC PROPERTIES OF SrZn₂-W TYPE HEXAGONAL FERRITE
Hiroshi Yamamoto,Hiroshi Fujii,Takayuki Mitsuoka 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
An experiment was carried out to investigate the effect of Na₂O additive on the magnetic and physical properties of SrZn₂-W type hexagonal ferrite. The specimens were prepared by the conventional manufacturing methods without atmosphere control. It was found that the magnetic properties of SrOㆍ2ZnOㆍ8Fe₂O₃ are considerably improved on adding 1.5wt% Na₂O. The optimum condition of making magnet with suitable properties are as follows : chemical analysis composition: Sr²+_(0.852)Zn²+_(l.721)Na+_(0.301)Fe²+_(0.723)Fe³+_(15.703)O_(27) ; semisintering condition: 1300℃ × 1h in air; sintering condition: 1250℃ × 0.5h in air. The magnetic properties are: Jm= 0.390 T, Jr= 0.348 T, H_(cJ)= 133.7 ㎄/m, H_(cB)= 129.7 ㎄/m, (BH)max = 21.50 kJ/㎥, Tc=371℃, H_A= 1091.5㎄/m, K_A = 2.13 × 10^5J/㎥ and n_B= 31.8 μB.
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Relationships between Mass and Porosity of Rough Rice Piled in a Combine Grain Tank
( Ryuichi Yoshizaki ),( Yasumaru Hirai ),( Muneshi Mitsuoka ),( Shio Inagaki ),( Eiji Inoue ),( Takashi Okayasu ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Percentage of ripened grains (PRG) is an important indicator to evaluate soil and crop management in rice production and is used to estimate weight of ripened brown rice by which economic returns are determined in Japan. This study focused on estimating PRG using bulk density of rough rice piled in the grain tank of a combine harvester. Our former study has showed that linear relationships between bulk density and particle density (an indicator of PRG) of rough rice piled in a vertical cylinder were dependent on the filling conditions of the rough rice. This finding required to clarify the filling conditions of the rough rice piled in a grain tank to estimate PRG using bulk density. Porosity is an indicator to evaluate the filling conditions. Thus, the objective of this study was to clarify factors affecting the porosity of rough rice piled in a grain tank. Relationships between mass and porosity of rough rice piled in a grain tank was measured through the field tests and the indoor experiments using a 6-row and a 4-row head feeding combine harvester, respectively. In addition, relationships between pressure at the bottom part in the grain tanks and porosity were compared between the field tests and the indoor experiments. The determination coefficients (R<sup>2</sup>) of regression lines between mass and porosity were high: 0.96 in the field tests and 0.88 in the indoor experiments. These relationships showed that mass is a major factor affecting porosity of rough rice piled in a grain tank. For the relationships between pressure at the bottom part of a grain tank and porosity, the field tests (moisture content: 23-29 %) showed 6 % larger porosity at around 2.5 kPa of pressure than the indoor experiments (moisture content: 15 %). Lowered fluidity of rough rice at higher moisture content is a possible cause of this larger porosity in the field tests. In addition, the magnitude of the slope of the regression line for relationships between the pressure and porosity was higher in the field tests (2.74) than in the indoor experiments (0.83). This result suggested that shaking of the combine during harvest, which involved only in the field tests, affected the porosity.
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Investigation of Terrain Slope Information and Tractor Driving Simulation on Reconstructed Ground
( Soyoung Shin ),( Eiji Inoue ),( Muneshi Mitsuoka ),( Takashi Okaysu ),( Yasmaru Hirai ),( Masami Matsui ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Despite the efforts of many researchers to improve the safety of agricultural machinery, fatalities have been caused by agricultural machinery annually. In Japan, about 50% of casualties caused by agricultural machinery are occurred by tractor rollover. In particular, the rollover of agricultural machinery causes major fatalities on the farm road. Agricultural machinery is easily rollover due to its high center of gravity when compared to other vehicles. In addition, when the implements are attached, the center of gravity moves according to the position of the implements, thereby exposing it to a greater risk of rollover. ROPS has been developed in an effort to reduce fatalities caused by tractor rollover accidents. The ROPS keeps the operator's space in case the tractor is overturned, preventing the operator from laying down from the tractor. Since 1997, ROPS has been mandatory for all riding tractors in Japan. Despite these efforts, however, there are fatalities caused by tractor rollover, and safety devices such as ROPS and seatbelts can not prevent fundamental accidents. In this study, we reconstruct the terrain images in front of the tractor using the stereo camera and analyze the slope of the reconstructed ground to predict the rollover accident of the tractor sensitive to the slope. The high center of gravity provides an opportunity to rollover in response to unexpected obstacles or steep slope. A stereo camera was used to record the frontal ground, and the obtained images were processed into a three-dimensional space through image processing in Matlab. The slope of the road surface on which the tractor is to be driven was identified, and the tractor maneuvering was identified through simulation of the motion model.
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Yosuke Miyachi,Rumi Nakabayashi,Minami Torai,Koichiro Mitsuoka,Gen Shimada,Toshimi Kaido 대한외상중환자외과학회 2023 Journal of Acute Care Surgery Vol.13 No.3
A male pedestrian in his 30’s was hit by a car and immediately taken to hospital by ambulance. On arrival, his blood pressure was 83/64 mmHg and his heart rate was 140 beats/min. Computed tomography showed extravasation of contrast medium from the lateral segment of the liver. Given the exacerbation caused by hypotension, an emergency laparotomy was performed. Temporary hemostasis was achieved by packing with gauze and a subsequent transcatheter arterial embolization. At the 2nd laparotomy, a small amount of active bleeding from the injury site was noted; therefore, an emergency lateral segmentectomy was performed. The postoperative course was uneventful and he was discharged home 8 days later. The pathology of the liver specimen revealed that a 2.5 cm hepatic hemangioma was the cause of bleeding. Traumatic rupture of hepatic hemangiomas is rare, and most reported cases are of giant hemangiomas. Our case demonstrated that even a small hemangioma can elicit life-threatening bleeding in blunt abdominal trauma.
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Ahn, Y.J.,Kim, M.J.,Kawamura, T.,Yamamoto, T.,Fujisawa, T.,Mitsuoka, T. 고려인삼학회 1990 Journal of Ginseng Research Vol.14 No.2
The growth responses of a variety of human intestinal bacteria to extracts of Panax ginseng and five other oriental medicinal Araliaceae were elraluattd in vitro and in vivo. The extracts enhanced the growth of Brifidobnnerilrm breve and B. longlim in media with or without carbon sources, suggesting that bifidus factors) might be involved in the phenomenon. This effect was most pronounced with water extract of P. ginseng, the growth of 27 bifidobacteria strains belonging to B adolescentis, B. longum, B. brim and B. infantis being greatly stimurated, whereas seven B. bifidum strains and other bacteria such as clostridia and Escherichin soli had little or no ability to utilise it for growth. Methanol extracts of p. ginseng were found to selectively inhibit growth of various clostridia including bifidobacteria. Paraputrificum, but this effect was not observed on other bacteria including bifidobacteria. The effect of ginseng extract intake (600 mg/day for two weeks) on the faecal microflora, pH, volatile fatty acids, ammonia, putrefactive products, and -glucuronidase, -glucosidase and nitroreductase activities, and on the blood components (triglyceride, total cholesterol and ammonia) were investigated using seven healthy human volunteers. The total concentration of faecal microflora including Bifidnkaderiifm app. during the period of ginseng extract intake %twas significantly unaffected from the preceding and subsequent control peroids. However, the frequency of occurrence of subjects having C. perfringens was significantly decreased. The faecal pH value was also significantly decreased, suggesting that the intake might increase the activity of Bifidobncterium spry. Other biochemical properties in faeces did not changed significantly. The levels of ammonia and triglycerid in blood were decreased with ginseng extract intake. These results may be an indication of at least one of the Pharmacological actions of p. ginseng as an adaptogen.
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