Development of Under-Film Corrosion Simulation Method Based on Cellular Automaton

2016 ◽  
Author(s):  
Naoki Osawa ◽  
Yasuhide Kanou ◽  
Yasumi Kawamura ◽  
Atsushi Takada ◽  
Kazuhiko Shiotani ◽  
...  
Keyword(s):  
Cellular Automaton ◽  
Harmful Effect ◽  
Surface Profile ◽  
Simulation Method ◽  
Surface Shape ◽  
Ballast Tank ◽  
Conventional Steel ◽  
Coating Failure ◽  
Cyclic Corrosion ◽  
Steel Panels

A simulation method for under-film corrosion has been developed for epoxy coated steel panels within a ship’s Water Ballast Tank (WBT) environment. The incubation and extension of coating failure is simulated by using two-dimensional cellular automaton, and the steel diminution is simulated by modifying IACS CSR-H’s 3-phases probabilistic model. Analysis parameters are determined by using the results of onboard exposure and cyclic corrosion tests performed by Shiotani et al. (2012, 2015). The change in corroded surface shape of epoxy coated scribed steel panels made of conventional steel and corrosion resistant steel (CRS) exposed in an ore carrier’s WBT for 4.8 years is simulated. The simulated coating deterioration (blister) area and the corroded surface profile agree well with those measured. This demonstrates the effectiveness of the developed simulation method and the determined parameters. The differences in analysis parameters between conventional steel and CRS suggest that CRS can reduce the harmful effect of the active corrosion region on the remaining coating life at the blister’s frontline and the corrosion under the blister.

Ultra-Precision Shaping and Ultra-Smooth Polishing Investigation of High-Purity Quartz Glass in Nanoparticle Colloid Jet Machining

2012 ◽  
Vol 426 ◽  
pp. 396-399 ◽  
Author(s):  
Xiao Zong Song ◽  
Yong Zhang ◽  
Fei Hu Zhang
Keyword(s):  
Quartz Glass ◽  
High Purity ◽  
Glass Surface ◽  
Morphological Characteristics ◽  
Surface Profile ◽  
Processing Technique ◽  
Surface Shape ◽  
Before And After ◽  
Ultra Precision ◽  
Nanoparticle Colloid

In this paper, ultra-precision shaping and ultra-smooth polishing investigations have been done upon a high-purity quartz glass substrate with an aspheric surface in nanoparticle colloid jet machining, which is an ultra smooth surface processing technique utilizing surface chemical reaction between work surface atoms and nanoparticles to remove the uppermost surface atoms. The shaping and polishing characters of high-purity quartz glass in nanoparticle colloid jet machining has been researched. The surface profile of the high-purity quartz glass workpiece before and after shaping has been measured by surface profilometer. And the surface microscopic morphological characteristics of high-purity quartz glass surface polished by nanoparticle colloid jet machining have been observed by atomic force microscopy (AFM). The measurement results indicate that nanoparticle colloid jet machining has good shaping ability for surface shape correction in ultra-precision machining. And the AFM observation results show that the roughness of the high-purity quartz glass surface has been reduced from 1.919 nm RMS to 0.784 nm RMS by nanoparticle colloid jet machining.

The Impact of Micro-Surface Shaping on the Piston/Cylinder Interface of Swash Plate Type Machines

2015 ◽  
Author(s):  
Ashley M. Wondergem ◽  
Monika Ivantysynova
Keyword(s):  
Surface Profile ◽  
Sine Wave ◽  
Operating Conditions ◽  
Surface Shape ◽  
Hydrodynamic Bearing ◽  
Piston Cylinder ◽  
Wide Range ◽  
Surface Shaping ◽  
Pumping Mode ◽  
The Impact

With the wide use of axial piston machines of the swashplate type in industry, it is essential to maximize the overall efficiency of the machines. Focusing on the piston-cylinder interface, as it performs as a hydrodynamic bearing simultaneously fulfilling a sealing function, the overall machine can be improved by reducing the power losses due to viscous friction and leakage flow of this interface. This paper presents a research study in regards to altering the geometry of the piston through micro-surface shaping influencing the generation of the fluid film between the piston and the cylinder. This investigation utilizes a novel fully coupled fluid structure interaction model considering both thermal and elastic deformations of the solid bodies to predict the phenomena occurring within the fluid gap. Encompassed in this simulation study is a diversity of piston micro-surface shapes and a wide range of machine operating conditions. The designs presented include an axial sine wave, a flat, cylindrical design with tapered ends, a barreled shape, a combination of the axial sine wave and barrel, along with a circumferential sine wave. High pressure operating conditions in pumping mode as well as common operating conditions in both pumping and motoring mode are considered for the various designs. The results demonstrate up to a 30% reduction in energy dissipation from a standard piston-cylinder interface at higher pressure operating conditions (over 15% reduction considering all three interfaces of the machine) with the addition of a barrel surface shape while a 25% reduction (over 5% overall) is achievable at lower operating pressures in pumping mode with a waved barrel surface profile. As for motoring mode a 30% reduction (around 10% overall) is possible with the introduction of a waved barrel surface profile on the piston. It will also be shown, that not only are these reductions possible though microsurface shaping of the piston, but the reliability of the machine is also improved by reducing run-in wear all while maintaining a cost-effective, manufacturable design.

INFORMATION-BASED EVACUATION EXPERIMENT AND ITS CELLULAR AUTOMATON SIMULATION

2009 ◽  
Vol 20 (10) ◽  
pp. 1583-1596 ◽  
Author(s):  
LIZHONG YANG ◽  
SHAOBO LIU ◽  
JIAN LI ◽  
KONGJIN ZHU ◽  
TINGYONG FANG
Keyword(s):  
Cellular Automaton ◽  
Simulation Method ◽  
Spatial Distance ◽  
Building Structure ◽  
Dynamic Information ◽  
Distance Information ◽  
Fire Alarm ◽  
Static Information ◽  
Crowd Movement ◽  
Movement Simulation

The evacuation process under emergency is studied by means of experiments and simulations, focusing on the influence of the environment information. A revised cellular automaton model in which environment information is considered as "static information" (building structure, spatial distance, etc.) and "dynamic information" (sounds of fire alarm, etc.) is introduced. Two scenarios, including evacuation with and without visibility in a classroom, are studied to investigate the different influence of the two kinds of information on human behavior. The experimental and simulation results demonstrate that: (1) to intensify the spatial distance information can reduce the evacuation time; (2) the spatial distance is not the only decisive factor especially in evacuation without visibility because the sound information, which is ignorable in evacuation with visibility, is playing a more important role under this condition; (3) the intensity of static information can reflect evacuees' familiarity of the environment; (4) the model can reproduce the experiments well, and the simulation method is useful for further study of the crowd movement simulation.

The Q Value Measurement of the Shadow Mask Surface Based on Laser Triangulation Measurement Technology

2012 ◽  
Vol 452-453 ◽  
pp. 1465-1469
Author(s):  
Li Zhong Lin ◽  
Cheng Bing Cao ◽  
Tao Wang ◽  
Zhou Huang
Keyword(s):  
Measurement Data ◽  
Surface Profile ◽  
Surface Shape ◽  
Measurement Technology ◽  
Shadow Mask ◽  
Q Value ◽  
Mesh Surface ◽  
Production Practice ◽  
Using Data ◽  
Value Measurement

Using the triangulation method of laser non-contact measurement, the surface shape of CRT's shadow mask and the Q value was high precision measured. Measuring the mesh surface, the laser beam may be all or part through the mesh. The extraction problem of the effective measurement data was studied. Setting the threshold to filter out the invalid data and the data influenced by the mesh, it retained a small amount of valid data. Using data fitting and interpolation methods to process part of the effective data, then extracting the geometry of the mesh surface profile, the good reproducibility results was gotten. The advanced measuring equipment used in production practice was also studied.

scholarly journals Precise Measurement of the Surface Shape of Silicon Wafer by Using a New Phase-Shifting Algorithm and Wavelength-Tuning Interferometer

2020 ◽  
Vol 10 (9) ◽  
pp. 3250
Author(s):  
Fuqing Miao ◽  
Seokyoung Ahn ◽  
Yangjin Kim
Keyword(s):  
Silicon Wafer ◽  
Phase Error ◽  
Surface Profile ◽  
Phase Shifting ◽  
Wavelength Tuning ◽  
Surface Shape ◽  
Window Function ◽  
Phase Shift Error ◽  
Coupling Error ◽  
New Phase

In wavelength-tuning interferometry, the surface profile of the optical component is a key evaluation index. However, the systematic errors caused by the coupling error between the higher harmonics and phase shift error are considerable. In this research, a new 10N − 9 phase-shifting algorithm comprising a new polynomial window function and a DFT is developed. A new polynomial window function is developed based on characteristic polynomial theory. The characteristic of the new 10N − 9 algorithm is represented in the frequency domain by Fourier description. The phase error of the new algorithm is also discussed and compared with other phase-shifting algorithms. The surface profile of a silicon wafer was measured by using the 10N − 9 algorithm and a wavelength-tuning interferometer. The repeatability measurement error across 20 experiments was 2.045 nm, which indicates that the new 10N − 9 algorithm outperforms the conventional phase-shifting algorithm.

Research on the Process of NC-ECM with Ball-End Cathode Based on FEM

2010 ◽  
Vol 458 ◽  
pp. 93-98 ◽  
Author(s):  
Yong Yang ◽  
Min Kang ◽  
Xiu Qing Fu
Keyword(s):  
Finite Element Method ◽  
Process Simulation ◽  
Current Density Distribution ◽  
Simulation Method ◽  
Surface Shape ◽  
Two Dimensional ◽  
The Finite Element Method ◽  
Analysis Model ◽  
Ansys Software ◽  
Simulation Parameters

In order to solve the difficulty in analyzing the shaping law of NC-ECM with ball-end cathode, the method of processing simulation was presented based on the finite element method (FEM). The two-dimensional analysis model of the electric field with ball-end cathode built in ANSYS software was solved. The current density distribution and surface shape in different time on the anode were obtained. The experiments based on the simulation parameters were carried out, and the dimensions of the processed surface were measured, which were compared with the theoretical values. It is indicated that the simulation method meets the accuracy of the engineering calculations. The method and theory for further in-depth research on the process simulation in NC-ECM with ball-end cathode are provided.

Research on the Process Simulation of NC-ECM with Ball-End Tool-Electrode

2010 ◽  
Vol 154-155 ◽  
pp. 338-343
Author(s):  
Min Kang ◽  
Xiu Qing Fu ◽  
Yong Yang
Keyword(s):  
Process Simulation ◽  
Electrochemical Machining ◽  
Current Density Distribution ◽  
Simulation Method ◽  
Difficult Problem ◽  
Numerical Control ◽  
Surface Shape ◽  
Tool Electrode ◽  
Analysis Model ◽  
Machined Surface

In order to solve the difficult problem in analyzing the shaping law of numerical control electrochemical machining (NC-ECM) with ball-end cathode, the process simulation based on the finite element method (FEM) is used in this paper. First, the two-dimensional analysis model of the electric field in NC-ECM with ball-end tool-electrode built by use of ANSYS software was solved, and the current density distribution and the machined surface shape on the workpiece were obtained. Then, the experiments based on the simulation parameters were carried out, and the cutting depth values were measured. Finally, the accuracy of the simulation was verified by the comparison between the calculated values and the actual values. The experiments showed that the simulation method meets the accuracy of the engineering calculations in NC-ECM.

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