scholarly journals WAVE PRESSURE FORMULA FOR PERFORATED CAISSON WITH DOUBLE CHAMBERS

2018 ◽  
pp. 34
Author(s):  
Sang-Ho Oh ◽  
Chang-Hwan Ji
Keyword(s):  
Physical Experiment ◽  
Single Chamber ◽  
Wave Pressure ◽  
Design Load ◽  
Clear Guideline ◽  
Perforated Caisson ◽  
Double Chamber

Some of perforated caisson breakwaters have double wave chambers, for which no clear guideline for estimating design load is available. The well-known Takahashi's formula (Takahashi and Shimosako, 1994) is basically applicable to single-chamber perforated caisson. Considering this, we conducted physical experiment to develop a wave pressure formula for double-chamber perforated caisson.

scholarly journals Prediction model of the clearance oil film for static vertical rail considering the ram deformation

2019 ◽  
Vol 234 (1) ◽  
pp. 42-49
Author(s):  
Yan-qin Zhang ◽  
Jin-jun Hou ◽  
Wei-cheng Gao ◽  
Zhi-wei Zhao ◽  
De-fan Zhou ◽  
...  
Keyword(s):  
Prediction Model ◽  
Working Conditions ◽  
Distribution Law ◽  
Single Chamber ◽  
Maximum Deformation ◽  
Deformation Law ◽  
New Type ◽  
Volume Method ◽  
Better Than ◽  
Double Chamber

In order to improve the cutting rigidity of hydrostatic oil pad on large vertical lathes’ vertical rail of hydrostatic ram, on the basis of a single-chamber oil pad, this paper proposed a new type of the double-chamber oil pad. Pressure field distribution law of the single-chamber and the double-chamber oil pad was obtained by the finite element volume method. Then, using the fluid–structure coupling method and Workbench software the deformation law of ram was obtained under different working conditions. Finally, oil film’s prediction model of the single-chamber and the double-chamber oil pad was solved under different working conditions. Oil film’s prediction model of the single-chamber oil pad and the double-chamber oil pad was obtained under various working conditions. The results show that the maximum deformation of the single-chamber of upper oil pad ranges from 0.079 to 0.92 µm, while the double-chamber oil pad ranges from 0.07 to 0.68 µm. The maximum deformation of the single chamber of lower oil pad ranges from 0.91 to 9.21 µm, while the double-chamber oil pad ranges from 0.74 to 9.14 µm, and the maximum deformation of the double-chamber oil pad is less than that of the single chamber, which shows that the rigidity of the double-chamber oil pad is better than that of the single chamber. The results are helpful to improve the bearing performance and service life of bearings.

Microstructure of the Fe-Ni-P Melt-Spun Ribbons Produced from the Single-Chamber and from the Double-Chamber Crucibles

2013 ◽  
Vol 203-204 ◽  
pp. 361-367 ◽  
Author(s):  
Krzysztof Ziewiec ◽  
Krystian Prusik ◽  
Krzysztof Bryła ◽  
Aneta Ziewiec
Keyword(s):  
Electron Microscope ◽  
Melt Spinning ◽  
Melting Furnace ◽  
Single Chamber ◽  
Arc Melting ◽  
Transmission Electron ◽  
Master Alloys ◽  
Melt Spun ◽  
Melt Spun Ribbons ◽  
Double Chamber

The aim of the work was to investigate the influence of the processing on the final microstructure of the melt-spun Ni-Fe-P ribbons. The melt-spinning was carried out in two ways. For the first one the alloy was molten in a simple single-chamber crucible and for the second one double-chamber crucible was used. The chemical composition of the alloy molten in the single chamber was Ni40Fe40P20. The two component melt-spinning was made starting from the Ni80P20 and Fe80P20 alloys. All of the three alloys were molten in titanium gettered argon atmosphere starting from 99.95 wt % Ni, 99.95 wt % Fe, Ni-P and Fe-P master alloys in the arc melting furnace. The alloys were melt-spun in helium. The phase composition and the microstructure of the melt-spun ribbons were investigated by X-ray diffraction (XRD), a transmission electron microscope (TEM), respectively. The fracture of the specimens were observed with use of scanning electron microscope (SEM). SEM observations of the fracture surfaces show different character of the fractured samples.

Microstructure of the Ni–Fe–Cu–P melt-spun ribbons produced from the single-chamber and from the double-chamber crucibles

2014 ◽  
Vol 615 ◽  
pp. S29-S34 ◽  
Author(s):  
Krzysztof Ziewiec ◽  
Artur Błachowski ◽  
Krzysztof Ruebenbauer ◽  
Aneta Ziewiec ◽  
Krystian Prusik ◽  
...  
Keyword(s):  
Single Chamber ◽  
Melt Spun ◽  
Melt Spun Ribbons ◽  
Double Chamber

How to Reduce 3-Deoxyglucosone and Acetaldehyde in Peritoneal Dialysis Fluids

2002 ◽  
Vol 22 (3) ◽  
pp. 350-356 ◽  
Author(s):  
Thomas Zimmeck ◽  
Andreas Tauer ◽  
Michael Fuenfrocken ◽  
Monika Pischetsrieder
Keyword(s):  
Peritoneal Dialysis ◽  
Carbonyl Compounds ◽  
Temperature Dependent ◽  
Single Chamber ◽  
Ph Values ◽  
Reactive Carbonyl Compounds ◽  
Dialysis Fluids ◽  
Double Chamber ◽  
Reactive Carbonyl

Objective 3-Deoxyglucosone (3-DG) and acetaldehyde were found to be the major reactive carbonyl compounds in conventional heat-sterilized peritoneal dialysis fluids (PDFs). The aim of this study was to identify factors in the production of PDFs promoting or inhibiting the formation of acetaldehyde and 3-DG. Design Single-chamber bag PDFs with different buffer systems and pH values were analyzed for acetaldehyde. 3-Deoxyglucosone was determined in double-chamber bag PDFs with different pH values, in commercially available samples, and in double-chamber products stored under defined conditions. Results Acetaldehyde was found in the presence of lactate and malate, whereas in 2-hydroxybutanoate-buffered solution propionaldehyde was detected instead. Between pH 5.0 and 6.0 the acetaldehyde content in lactate-buffered solutions increased strongly. The concentration of 3-DG in the chamber containing glucose in double-chamber bags increased between pH 3.0 and 5.0 by a factor of 6. 3-Deoxyglucosone concentrations in commercially available products vary greatly, reflecting the different pH values of these products. A time- and temperature-dependent reaction leads to a reduction in 3-DG and an increase in 5-hydroxymethyl-furan-2-carbaldehyde during storage. Conclusion Acetaldehyde is produced by a reaction that requires both lactate and glucose. Thus, its formation can be prevented by a separation of the reaction partners, glucose and lactate, in a double-chamber bag. In double-chamber bags, pH greatly influences the formation of 3-DG. Minimal formation is observed in the region of pH 3.0. This finding should be taken into account for the development of new double-chamber bag PDFs.

scholarly journals MEASUREMENT OF WAVE PRESSURE ON PERFORATED CAISSON WALL UNDER OBLIQUE WAVE INCIDENCE

2014 ◽  
Vol 1 (34) ◽  
pp. 68
Author(s):  
Sang-Ho Oh ◽  
Chang-Hwan Ji ◽  
Young Min Oh ◽  
Hee Do Ahn
Keyword(s):  
Wave Pressure ◽  
Oblique Wave ◽  
Perforated Caisson ◽  
Wave Incidence

scholarly journals SIMULATION OF IRREGULAR WAVE PRESSURE ON PERFORATED BREAKWATERS

2011 ◽  
Vol 1 (32) ◽  
pp. 29 ◽  
Author(s):  
Xuefeng Chen ◽  
Yucheng Li ◽  
Liu Long
Keyword(s):  
Experimental Data ◽  
Numerical Method ◽  
Water Level ◽  
Least Squares Method ◽  
Front Wall ◽  
Back Wall ◽  
Wave Pressure ◽  
Irregular Wave ◽  
The Stability ◽  
Perforated Caisson

In this paper, the wave pressures on the perforated caissons breakwaters are investigated. The front wall of the perforated caissons is usually perforated above a certain water level considering the stability of the structure, and the chamber of the perforated caisson is filled with rock. Based on the RANS and k- equations, the numerical method to simulate the interaction of the irregular wave with the perforated breakwaters is researched. Moreover, the wave pressures distribution on the front perforated wall and the back wall are discussed through the numerical calculations, respectively. Then, the simplified formulas to compute the wave pressures on the different position of perforated caisson are obtained from experimental data by using the least-squares method.

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