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Volume 50, Issue 1
Displaying 1-15 of 15 articles from this issue
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M. MIKAYAMA1988 Volume 50 Issue 1 Pages 5-6
Published: 1988
Released on J-STAGE: April 30, 2010
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M. TAKANASHI1988 Volume 50 Issue 1 Pages 7-8
Published: 1988
Released on J-STAGE: April 30, 2010
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Yoshio Nishiyama1988 Volume 50 Issue 1 Pages 9-10
Published: 1988
Released on J-STAGE: April 30, 2010
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Nobutaka ITO, Nobukazu IGUCHI1988 Volume 50 Issue 1 Pages 11-18
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper deals with the proposal of a practical method for reducing turning motion resistance of the multi-powered wheel vehicle. In the previous paper the same kind of idea as this practical method for improving the turnability of the tracked vehicle was introduced. From that discussion it was found that the proposed method can be effectively applied for actual use of tracked vehicle and it reduced the turning motion reisitance drastically compared with the normal turning motion. Through the experiments, almost the same amount of reduction of turning motion resistance as the tracked vehicle could be observed. This proposed idea of reducing the resistance can be practically applied to commercial off-road vehicle for improving the turnability and the manoeuverability for obstacle negotiation.View full abstractDownload PDF (3111K) -
Soil Bin Test Results and Its ApplicationsJun SAKAI, Cheng ZOU1988 Volume 50 Issue 1 Pages 19-26
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe objective of this study is to analyze the power transmission characteristics of a tractor-rotary tilling system and to obtain basic data for designing, testing and using a power tiller. The theories of return power, feedback power and power transmission efficiency in a closed-loop system were analyzed in previous reports. In this report, experiments on the soil bin were carried out and the applications of the feedback power theories were studied.
The experiments were done with a remodeled device of a rotary tiller. The engine torque, rotary tilling torque, driving torgue of wheels and their rpm are measured by use of this device. Then, return power, feedback power, traveilng power and the power transmission efficiency in a closed-loop system of a power tiller are calculated from these experimental data. The comparison between the calculated and measured values is also discussed. It was proved that the driving wheels are driven by not only the power transmitted from the engine, but aslo the feedback power caused by rotay tilling resistances. The equations to calculate optimum mass and engine power from machine specifications and tilling conditions are proposed with transmission efficiency in a closed-loop ststem.View full abstractDownload PDF (1083K) -
A Measurement of Soil Reactions on a Lug and a RimKoichi HASHIGUHI, Masahiro KAMEI, Tatsuo HIROMA, Jun SAKAI, Yuichiro I ...1988 Volume 50 Issue 1 Pages 27-36
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to get rational data for designing a rigid lugged wheel travelling on a soft ground, a special test wheel was made, which enables to measure soil reactions acting on a lug and a rim simulteneously and independently, and then reactions were mesured on soft upland soils.
The following results were obtained from this measurement.
(1) The resultant wave of forces acting on a lug and a part of rim coincided approxiately with the force wave measured in the wheel axle.
(2) The force acting on a part of rim reaches 60% of that on a lug. The ratios of the net thrust force and of the dynamic contact force supported by a rim to ones by both a lug and a rim increase with an increment of lug angle.
(3) The net thrust, the traction coefficient and the wheel axle torque increase with a slippage and with a decrease of the lug angle.
(4) The traction efficiency becomes maximun at about 15% of slippage and 1.047rad. {60deg.} of lug angle.
(5) Eventually, it would be stated that the best performance is realized at about 0.698rad. {40deg.} of lug angle in the soft soils with a high void ratio.View full abstractDownload PDF (3064K) -
Measurement System based on Synergetics for Dynamic Behavior of Cohesive Soil under lmpact LoadSakae SHIBUSAWA1988 Volume 50 Issue 1 Pages 37-46
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe trial designed experimental system is composed of;
(1) the unconfined impact compression test apparatus for loading to cohesive soil piece through carbon steel rod,
(2) the estimation system for dynamic parameters of the soil piece from stress waves propagated in both the steel rod and the soil piece and axial deformation of the soil piece.
Young's modulus of the soil piece in microscopic time scale was estimated from reflected stress wave in the steel rod, and that in macroscopic time scale was estimated from the stress propagated in the soil piece and the axial deformation. The latter Young's modulus values were derived from the former Young's modulus values by statiscal dynamics calculation wlth microscopic behavior model of soil particles. The dynamic behavior of the soil piece was a kind of synergesic phenomenon such as macroscopic self-organizing process from the chaos state microscopic level under external control force.View full abstractDownload PDF (3365K) -
Takharu KAMEOKA1988 Volume 50 Issue 1 Pages 47-52
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAn experimental dryer was constructed to measure the drying characteristics of deep and shallow beds of cereal grains including rice. Experiments were carried out on rough rice both in shallow and in deep beds to catch the performance of this dryer, and it was found that the performance was sufficient enough to attain the original objectives. Drying characteristics of rough rice such as 1) moisture content distribution in the bed, 2) air temperature distribution in the bed, 3) drying rate, 4) moisture content before and after drying etc. were obtained. At the same time, the inlet air temperature and humidity, the outlet air temperature and humidity, air flow rate and pressure drop in the bed were measured. The initial moisture content of grain was determined by using the oven method of 105°C for 5 hours.View full abstractDownload PDF (983K) -
Satoshi MURATA, Akio TAGAWA, Sadato ISHIBASHI, Yoshiaki HORI1988 Volume 50 Issue 1 Pages 53-60
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to estimate the stress distributions and the capacity in farm tower silos which depend on the compressibility of cereal grains and wall friction, the compressive properties of cereal grains were formulated using the results of compressive tests in the laboratory. Janssen's formula was then extended so as to include the case of compressibility in grain beds, and μk, the product of coefficient of wall friction μ and lateral to vertical pressure ratio k, were determined by comparing the experimental data of the displacement in model steel bins with the calcuated results.
The stress distributions of a silo in actual scale were estimated by the extended Janssen's formula, and the silo capacity was calculated by using these results.View full abstractDownload PDF (1069K) -
Electrostatic Charging System and CharacteristicsKohnosuke TSUGA, Hideyuki ICHIKI, Michio KAJIYAMA1988 Volume 50 Issue 1 Pages 61-68
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFor pest control in a greenhouse, drift application methods of dust, smoking pesticide and liquid formulation have advantage for the operator without his exposure to chemicals. And a study of adaptation of electrostatic force for these chemicals was carried out for the purpose of improvement of deposit. The results showed that electrostatic application methods and an electric field by high voltage wires in the house, improve deposit of chemicals mainly on the under surface of leaves and pest control effects. The process of these studies will de mentioned by the series of 3 reports.
In this report, applications of fine dust formulation by knapsack type duster, smoking pesticide by axial blower and liquid formulation by non-heating fog machine were carried out. And improvement of chemicals deposit, by corona charging method and induction charging method with electric field by high voltage wires, were discussed.View full abstractDownload PDF (1207K) -
Analysis of a Process of Drying Grass Layered in an Airforced Solar House EquipmentKeiichi INOUE, Zisaku MASUDA, Toru YOSHIHARA1988 Volume 50 Issue 1 Pages 69-79
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA simulation model constructed for analyzing a process of drying grass under variable air conditions in an actual solar house is reported in this paper.
This model is founded on epuations for mass and energy balance. The properties of matters such as mass and heat transfer coefficient or Raynolds number are expressed, in this model, by functions of various factors, i. e, temperature and velocity of air, density of grass-bulk. And its constant parameters contained in this model were obtained by analysis of experimental data.
Local moisture and temperature of grass, air temperature and humidity in layers are calculated in this model, and also the unknown properties snch as mass and heat transfer coefficient or Raynolds number can be presumed, at the same time, from the theory of Chilton-Colburn analogy.
By selecting proper parameters, calculations with this model gave satisfactory approximations to measured values.
Through this study, it is also ascertained that calculation of equilibrium moisture content was useful for understanding the process of drying grass.View full abstractDownload PDF (1342K) -
Pipeline MilkerAkihiro GONDO, Sanki HASEGAWA, Yukio AZUMA1988 Volume 50 Issue 1 Pages 81-90
Published: 1988
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA simulation model was developed to study on operation in various pipeline milkers in a cow shed. The performance of the milker was simulated for one operator under various conditions, and the predictive equation was established in order to estimate the performance of pipeline milkers easily.
The results are as follows:
1) Average milking time in the herd and number of milker units are most important factor in determining the performance of the pipeline milker.
2) When average milking time in the herd is more than 2min.×number of units, average milking time is important factor, but when it is less than 2min.×number of units, preparation-work-time and after-work-time are important factors. 3) The number of milking units by one man operation is below 3 units. When it has to use 4 units, it is nesessary to set the automatic cluster removal.
4) The coefficient of variation of the milking time in the herd and herd size are less important for the performance in the pipeline milker.
5) If two men are engaged milking work, it is better for performance of milking that they share the number of cows rather than they share the progress of work each other. But there is little difference between them.View full abstractDownload PDF (1286K) -
Atsushi SAWAMURA, Fukuji MIYAZAWA, Jun-ichi SATO, Noriaki ISHIZUKA1988 Volume 50 Issue 1 Pages 91-96
Published: 1988
Released on J-STAGE: April 30, 2010
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Kunio MORI, Mitusi YAMASITA, Jiahu SON1988 Volume 50 Issue 1 Pages 97-102
Published: 1988
Released on J-STAGE: April 30, 2010
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Yinwu ZHU, Osamu KITANI, Tsuguo OKAMOTO1988 Volume 50 Issue 1 Pages 103-107
Published: 1988
Released on J-STAGE: April 30, 2010
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