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Volume 45 (1983 - 198･･･
- Issue 4 Pages 429-
- Issue 3 Pages 282-
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Volume 45, Issue 4
Displaying 1-18 of 18 articles from this issue
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[in Japanese]1984 Volume 45 Issue 4 Pages 429-430
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (344K) -
Effect upon abrasionISHI, TAEUCHI, KURJTA1984 Volume 45 Issue 4 Pages 431-435
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIt was found that the effect of the water ratio mixed in the emulsified fuel on the abrasion for a precombustion chamber type small diesel engine was remarkable.
When W/F=0.3 of emulsified fuel was used on the engine, the rate of piston ring abrasion and of Fe invoved in lubricating oil was least. Under the normal running condition using lubricating oil containing acid neutralizer characteristics and detergent dispersant characteristics and intermittent run, the abrasion when W/F=0.3 was about 40% less than the case of W/F=0.0, gas oil or standard fuel. On the other hand, the abrasion when using W/F=0.7 and 1.0 was 20-60% lager than the one when W/F=0.0.
The effect of additives in lubricating oil on the engine abrasion should be considered in the case of use emulsified fuel as well as gas oil. and the difference was 40-60%.
The further investigation of the effect of longer period of operation on abrasion should be needed.
Finally it can be concluded synthetically from the studies in Part 4 that W/F=0.3 is the most suitable water ratio for the practical performance of thermal efficiency, power, maximum pressuure, rete of maximum pressure rise, knocking, exhaust gas, startability, abrasion and so on.View full abstractDownload PDF (4717K) -
Air-Fuel Ratio, Ignition Timing and Exhaust NOx EmissionHideo TERAO, Hiroyuki NISHIMURA, Katsuhiro MATSUI1984 Volume 45 Issue 4 Pages 437-443
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe purpose of the present study is focused on determining the proper mixture ratio of blended fuels and proper ignition timing, when a small ignition engine for farm use is operated with 20% by volume peppermint oil blended gasoline and 20% by volume spearmint oil blended gasoline, respectively. It has been confirmed that regarding BSFC as important equivalent ratio is desired 0.9, and regarding BHP as important equivalece ratio is 1.1. It was observed that an appropriate ignition timing were at BTDC 20° CA. This ignition timing showed little difference from originally set value of the engine. For the spark ignition timing it can be seen that conventional ignition system used for commercial ones are well matched to these two fuels. It was also found that on BSFC these 3 tested fuels including neat regular gasoline with lead free agreed very much. However, BMEP for P20 and for S20 are 5.7% and 3.7%, respectively, and it was increased than that of G100. This was also observed from NOx emission obtained to operate the engine with these 3 tested fuels under MBT operating condition.View full abstractDownload PDF (3211K) -
Effect of Cab Suspension on Vibration ReductionAkira OIDA, Takashi TANAKA1984 Volume 45 Issue 4 Pages 445-451
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the Part 1 of this report series we showed that the noise in the tractor cab increased because of solid borne sound, which was generated by the vibrations of cab walls caused by engine vibration. In this part we suggest a cab suspension method to reduce the vibrations of cab walls, in order to reduce the solid borne sound in a low frequency range. Vibrations of a model cab were analysed theoretically in the cab suspension system and measured closely by experiments. From the consideration on the theory and test results, it was clarified that the suggested cab suspension system had a considerable effect on the vibration reduction. The lower the spring rate of suspension system was, the more the effect was.View full abstractDownload PDF (967K) -
Tetsuji TANIGUCHI, Tetsuya ONO, Koh-ichi OHTOMO1984 Volume 45 Issue 4 Pages 453-458
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSReports from manufacturers and other tests and evaluation are unaimous in improvement in tractor performance of 10 to 20 per cent occasionary up to 30 per cent more traction, consumption of 10 to 15 per cent less fuel by radial tires. But as there are few reports revealing by experimental data, this study has been conducted to findout the actual drawbar performance of a radial-ply and bias-ply tires by measuring rear axle torque and drawbar pull.
Under the conditions tested for the tractor equipped with radial tires, 4.4 to 22.1 per cent more traction, 5.9 to 23.3 per cent more rear axle torque, 4.9 to 20.2 per cent more coefficient of traction at no load speed of 1.5m/s, could be odtained inspite of the difference due to the various tire inflation pressure. The results suggested that the elasticity, contact width, contact length, and slip sinkage of tire were associated with drawbar pull, and it was quitely affected by the forces acting at the interaction between the contact surface of tire tread and media on which it was operating. It can be pointed out from the further study that the radial-ply tire can give the remarkable fuel efficiency from the view point of energy saving.View full abstractDownload PDF (770K) -
Jun SAKAI, Koichi HASHIGUCHI, Taka-aki MATSUO, Eizaburo TANAKA, Tokumi ...1984 Volume 45 Issue 4 Pages 459-466
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFarm lands generally consist of two layers, i. e., a hardpan and a soft tilth on it. Noting this feature of farm lands, we carried out sinkage tests of various rectangular loading plates with sizes and shapes of ground contact surfaces of rubber crawlers in Japanese combine harvesters, in a shallow soil bin (12.5cm depth) corresponding to tilth in paddy fields. From these tests, for the size and the shape of ground contact surfaces of rubber crawlers of Japanese combine harvesters it could be concluded that under the same contact pressure i) the wider the loading plate with a same length and ii) the stockier the loading plate with a same area, the smaller the sinkage is.
These trends are entirely inverse to those observed in homogeneous semi-infinite grounds. Some mechanical reasons for the opposite trends are described by resolving the sinkage resistance into the compression resistance of soils under the loading plate and the shear resistance of soils arround the plate, and especially it is indicated that the compression resistance has a large effect on a sinkage in the soils on a hardpan.View full abstractDownload PDF (5137K) -
Application of Fuzzy Set Theory to GradingVinh Duc CHAU, Shigeo UMEDA, Kentaro MOHRI1984 Volume 45 Issue 4 Pages 467-473
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn the present grading of agricultural products, the shape and peel color are major factors, and they are estimated on the status of appearance, generally, the Fuzzy set theory was applied to calculate the discriminant functions for grading agricultural products.
According to the property factors such as shape index, colored degree and colored uneveness that were reported in the previous papers, the satsuma oranges were attemped to resort into two groups A and B. The results were obtained as follows:
The values of membership functions (estimated functions) of shape index S*, colored degree Cm, and colored uneveness Cv(1) that belong to A group increased (from 0 to 1) as S* increased, Cm and Cv(i) decreased.
After resorting by this method, the shape flakiness of satsuma oranges belong to A group was greater (ratio of diameter and height was smaller), and the peel color was more even and progressive than those belong to B group. Additionally, the standard deviations of all factors (shape index, colored degree, colored uneveness) of A group became smaller as compared with the results that were obtained from manual sorting at the fruits sorting plant, It shows that this method is available for grading agricultural products.View full abstractDownload PDF (933K) -
Development of Solar Pumping Test System and its Exergy AnalysisOsamu KITANI, Tsuguo OKAMOTO, Kenji IMOU, Suk-gun LEE, Masashi HANAGAT ...1984 Volume 45 Issue 4 Pages 475-484
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA Rankine cycle solar pumping test device was constructed. Solar heat from a set of flat plate collectors drove this system. Investigations were made on the effects of system parameters change on its steady performances.
Dynamic performances of the system in connection with the collector units were also investigated. Heat and exergy analysis was made on the experimental results. This analysis indicated some points of improvement on system efficiency.View full abstractDownload PDF (1423K) -
A Simplified Type of Air CollectorKazuo HORIBE, Kenji NAKAGAWA, Seiichi OHSHITA, Masatoshi MAEDA1984 Volume 45 Issue 4 Pages 485-492
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFor the practical applications of the solar energy to rice grain drying, the field experiment should be done so often to solve the undecided problems. But it looks difficult to expect whether the field experiment is conducted under completely desired conditions, because experimental conditions are dependent mainly on the climates.
The rice grain drying using the solar energy was therefore numerically computed by use of the mathematical model proposed to investigate the properties and economical merits and demerits of the system.
In this paper, with respect to the simple air collector of a suspended plate type which has a high efficiency, the followings were derived: the adaptability of a mathematical model to an actual system, the influence of the solar radiation and others on the collector properties such as a quantity of solar energy collected, the economiically considered limit of the cost per unit area of collector.View full abstractDownload PDF (1076K) -
Measuring Methods of Splitting Condition and Energy EfficiencyHiroshi SHIMIZU, Toshinori KIMURA, Hiroshi KATAHIRA1984 Volume 45 Issue 4 Pages 493-498
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSSome measuring methods were determined to recognize the overall splitting condition of rice straws. The overall splitting condition was expressed by two ratios α and β as to increase of areas and direction of splitting.
The values of α were from 6.2 through 9.0 for storaged straw and from 7.2 through 12.5 for new straw. The values of β were from 49 through 78 for storaged straw and from 37 through 68 for new straw. The increase of longitudinal section was remarkable in any cases.
The cross sectional splitting required more energy consumption than that of longitudinal splitting.
Energy efficiency η was determined by the ratio of net splitting energy to practical input energy. The measured values of η were from 0.74 through 1.46 per cent for storaged straw and from 0.56 through 0.77 per cent for new straw.
This fact showed that the most of input energy can be consumed as a heat loss by mechanical friction. And it suggested to us the necessity of investigations on the efficiency improvement.View full abstractDownload PDF (884K) -
Chiyuki TAKABAYASHI, Akira HOSOKAWA1984 Volume 45 Issue 4 Pages 499-505
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFor the purpose of obtaining the fundamental data for evaluating the state of cooked cocoons by measuring the peeling tension force of cocoon filament, the authors simulated the occurrence of a cocoon filament's peeling tension and discussed the mechanism of its occurrence of the peeling tension. As a result of that, the mechanism of a cocoon filament's peeling tension force was analyzed, and it made possible to determine the degree of finishment of cooked cocoons by the cocoon filaments' peeling tension.View full abstractDownload PDF (3226K) -
Hitoshi YOSHITOMI, Fujio NAKANO, Hiroshi TAKIYA, Katsuhiro SUZUKI1984 Volume 45 Issue 4 Pages 507-514
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSFor the further detailed discussion about the factors affecting on the motion of tea leaves in a primary drying tea roller, some experiments were carried out under vaious conditions and the effect of some factors was investigated on the basis of the observation of actual motion of tes leaves. On the other hand, a program for computer simulation based on the equation of tea leaf motion was developed. The results of simulation were compared with those of the obsevation and discussed. It was found that the trajectory of tea leaves was greatly influenced by both of the design condition of the roller and the property of tea leaves. Some profitable informations for determining the optimum design or operating condition were also obtained.View full abstractDownload PDF (1308K) -
Osamu YUKUMOTO, Koichi TOSAKI, Toshinori ISHIKAWA, Yoshihumi HASHIMOTO1984 Volume 45 Issue 4 Pages 515-520
Published: 1984
Released on J-STAGE: April 30, 2010
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Skin Drying Rate of a Single BulbSetsuo HAYASHI, Ritsuya YAMASHITA1984 Volume 45 Issue 4 Pages 521-524
Published: 1984
Released on J-STAGE: April 30, 2010
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Senkichiro HAYAKAWA, Ritsuya YAMASHITA, Hitoshi YOSHITOMI, Eiichiro SA ...1984 Volume 45 Issue 4 Pages 525-530
Published: 1984
Released on J-STAGE: April 30, 2010
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Tsuguo OKAMOTO, Osamu KITANI1984 Volume 45 Issue 4 Pages 531-534
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (570K) -
Strength Test Procedures and Acceptance ConditionsYoshiaki MORI, Osamu YUKUMOTO, Akira HIRATA, Masamitsu TAKAHASHI1984 Volume 45 Issue 4 Pages 535-539
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (689K) -
[in Japanese]1984 Volume 45 Issue 4 Pages 541-545
Published: 1984
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (832K)
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