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Volume 47 (2016)
- Issue 4 Pages 146-
- Issue 3 Pages 95-
- Issue 2 Pages 59-
- Issue 1 Pages 1-
Volume 47, Issue 1
Vol. 47, No. 1 (Ser. No. 148)
Displaying 1-4 of 4 articles from this issue
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Kazuya TAKAHASHI, Yasushi UEMATSU2016 Volume 47 Issue 1 Pages 1-8
Published: 2016
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSThe present paper investigates the collapse process of pipe-framed greenhouses under wind or snow loading based on a non-linear finite element analysis in order to establish more reasonable wind and snow resistant designs. The analytical model is limited to a two dimensional problem. Regarding the wind loading, fluid-structure interaction (FSI) is considered, because the deformation under wind loading may affect the wind pressure distribution significantly. That is, the wind pressure distribution on the deformed structure is computed by Computational Fluid Dynamics(CFD), and then the result is used for the structural analysis at the next step. Focus is on the time-averaged deformation and wind pressure. The results indicate that the FSI effect is fairly small up to the allowable stress or deformation used in the current design standards. However, the FSI affects the collapse load and mode, significantly. Regarding the snow loading, not only even but also uneven distribution of snow accumulation are considered, because wind affects the snow accumulation significantly. The results indicate that the uneven load gives lower collapse load than the even load. It is found that the safety margin up to collapse beyond the allowable stress or deformation is rather small. The analytical results on collapse mode are consistent with the findings of damage investigations both for the wind and snow loadings.View full abstractDownload PDF (1999K) -
-Development of Automatic Devices for Cutting Root and Peeling-Osamu FUJIOKA, Sadao OMORI, Hiroshi MATSUMOTO, Tomoaki KOGURE2016 Volume 47 Issue 1 Pages 9-15
Published: 2016
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSIn welsh onion production, preparation time before shipment occupies about one third of total working hours. Therefore, we developed an automatic root cutting and peeling mechanism to save labor and implemented these mechanism into a prototype. As a result of field test using the prototype, the work efficiency was about 500 pieces per hour. As for the rate of precise root cutting was about 94 %, the rate of precise peeling was about 91 % and the rate of shippable pieces were about 96 %. The work efficiency of the prototype was about 1.5 times compare to an expert worker, precise workability was about equal. The prototype could reduce the noise of peeling device to 87 dB(A) from about 100 dB(A). We confirmed that had a soundproofing effect than normally used peeler. The joint development company has started marketing of automatic welsh onion trimmer on the basis of the prototype in 2002.View full abstractDownload PDF (1647K) -
-Development of Higher Efficiency Automatic Trimmer for Welsh Onion and Testing it on Farmers Field-Osamu FUJIOKA, Sadao OMORI, Hiroshi MATSUMOTO, Tomoaki KOGURE2016 Volume 47 Issue 1 Pages 16-22
Published: 2016
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSFor getting higher performance than first prototype of automatic welsh onion trimmer, we made the second prototype which can trim two piece of welsh onion at the same time. As a result of field test at Akita and Oita Prefecture used the second prototype, the working efficiency was about 900-1 200 pieces per hour. As for the rate of cutting root precisely was about 91-95 %, the rate of peeling precisely was about 87 % and the rate of shippable pieces were about 96-97 %. In one-man operation, the work efficiency was about 820 pieces per hour, and it became about 2.5 times than an expert worker. Therefore, we understood that the work efficiency improvement of the second prototype depends on the skill of supply work. The second prototype also could reduce the noise of peeling device to 88 dB(A) as equal as the first one. We confirmed that had a soundproofing effect than normally used peeler. The joint development company has started marketing of automatic welsh onion trimmer on the basis of the prototype in 2002.View full abstractDownload PDF (1875K) -
Toru HIJIKATA, Hiroshi NAKATANI, Masakazu MATSUDA, Takaaki SATAKE2016 Volume 47 Issue 1 Pages 23-31
Published: 2016
Released on J-STAGE: September 07, 2023
JOURNAL OPEN ACCESSA new space-saving model circulation dryer has been introduced for the operation of grain drying, processing, and storage facilities. This dryer permits a reduction in the size and overall height size of the structure, including the bucket elevator, by 20 %, while maintaining system capacity and function. As a result, owners and operators can expect a cost reduction for replacing old systems in existing facilities and for the construction of new facilities. Furthermore, the improvement of the dryer can be expected to reduce the damage of the grain, improving overall grain quality. Because of its important function in the operation of grain storage facilities, we examined the basic performance of the new space-saving circulation dryer in actual use at half- and full-capacity operation and obtained the following results, confirming design expectations: The processing capacity was 32 t/h, and the drying rate was almost 0.6 %/h, confirming the prescribed operation rates. The increase in the percentage of absolutely cracked grain before and after drying was not seen, and there was no degradation in the quality of the grain. The energy input requirement for the removal of water was between 4.7 and 5.5 MJ/kg, which is low when compared with the energy requirement reported for older systems, which was 5.7 MJ/kg.View full abstractDownload PDF (1401K)
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