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Národní úložiště šedé literatury Nalezeno 5 záznamů.  Hledání trvalo 0.00 vteřin. 
Effect of Surface Texturing on Friction and Film Thickness under Starved Lubrication Conditions
 Ali, Fadi ; Kaneta, Motohiro (oponent) ; Glovnea, Romeo (oponent) ; Hartl, Martin (vedoucí práce)
This PhD thesis focuses on studying the effects of shallow micro-textures on friction and film thickness of lubricated non-conformal contacts under extreme and starved conditions. Measurements were carried out using a ball-on-disc tribometer equipped with high speed camera and torque sensor. Two types of micro-textures have been assessed in this study, micro-dents and transverse micro-grooves. The results reveal that micro-dents are helpful in reducing friction under starved conditions due to the film thickness enhancement. The mechanism of filling the depleted micro-dents with fresh lubricant is probably attributed to the capillary effect in the inlet zone under starvation. On the other hand, the rubbing surfaces with transverse shallow micro-grooves with a length less than the diameter of the Hertzian contact have an improved tribological performance in comparison with smooth surfaces. Indeed, transverse shallow micro-grooves showed a significant enhancement of film thickness under starvation and under extreme operating condition (reverse motion). The numerical simulation of the transient behavior of transverse limited micro-grooves showed accepted agreement with experimental results.
Úplný záznam
Effects of Non-Newtonian Lubricants on Surface Roughness in Point Contacts
 Ficza, Ildikó ; Kaneta, Motohiro (oponent) ; Poll, Gerhard (oponent) ; Hartl, Martin (vedoucí práce)
This PhD thesis focuses on the study of roughness deformation inside an elastohydrodynamically lubricated point contact. The passage of the roughness feature through the contact zone is modeled using numerical techniques. A single transverse ridge is assumed in the transient EHL model which presents a complex problem with a second order partial differential equation an integro-differential equation. Non-Newtonian fluid behavior is assumed in the model which further increases its complexity. In order to solve the system of equations the multigrid techniques are applied. The thesis contains the mathematical model describing the problem and a detailed description of the multigrid method. The results obtained by the simulations are compared to experimentally evaluated film thickness values. The roughness deformation is observed for a wide range of operating conditions as well as for different lubricant parameters. The effect of these lubricant parameters on the deformation is studied as well.
Úplný záznam
Neutral Kaon Photoproduction at LNS, Tohoku University
 Kaneta, M. ; Chiga, N. ; Beckford, B. ; Ejima, M. ; Fujii, T. ; Fujii, Y. ; Fujibayashi, T. ; Gogami, T. ; Futatsukawa, K. ; Hashimoto, O. ; Hosomi, K. ; Hirose, K. ; Iguchi, A. ; Kameoka, S. ; Kanda, H. ; Kawama, D. ; Kawasaki, T. ; Kimura, C. ; Kiyokawa, S. ; Koike, T. ; Kon, T. ; Ma, Y. ; Maeda, K. ; Maruyama, N. ; Matsumura, A. ; Miyagi, Y. ; Miura, Y. ; Miwa, K. ; Nakamura, S. N. ; Nomura, H. ; Okuyama, A. ; Ohtani, A. ; Otani, T. ; Sato, M. ; Shichijo, A. ; Shirotori, K. ; Takahashi, T. ; Tamura, H. ; Taniya, N. ; Tsubota, H. ; Tsukada, K. ; Terada, N. ; Ukai, M. ; Uchida, D. ; Watanabe, T. ; Yamamoto, T. ; Yamauchi, H. ; Yokota, K. ; Ishikawa, T. ; Kinoshita, T. ; Miyahara, H. ; Nakabayashi, T. ; Shimizu, H. ; Suzuki, K. ; Tamae, T. ; Terasawa, T. ; Yamazaki, H. ; Han, Y. C. ; Wang, T. S. ; Sasaki, A. ; Konno, O. ; Bydžovský, Petr ; Sotona, Miloslav
The elementary photo-strangeness production process has been intensively studied based on the high-quality data of the charged kaon channel, gamma + p -> K+ + Lambda(Sigma(0)). However, there had been no reliable data for the neutral kaon channel gamma + n -> K-0 Lambda(Sigma(0)) and the theoretical investigations suffer seriously from the lack of the data. In order to have reliable data for the neutral kaon photo-production data, substantial effort has been made to measure the gamma + n -> K-0 + A process in the pi(+)pi(-) decay channel, using a liquid deuterium target and a tagged photon beam (E-gamma = 0.8-1.1 GeV) in the threshold region at the Laboratory of Nuclear Science (LNS), Tohoku University. We have taken exploratory data quite successfully with the use of Neutral Kaon Spectrometer (NKS) at LNS-Tohoku in 2003 and 2004. The data is compared to theoretical models and it indicates a hint that the K-0 differential cross section has a backward peak in the energy region. The second generation of the experiment, NKS2, is designed to extend the NKS experiment by considerably upgrading the original neutral kaon spectrometer, fully replacing the spectrometer magnet, tracking detectors and all the trigger counters. The new spectrometer NKS2 has significantly larger acceptance for neutral kaons compared with NKS, particularly covering forward angles and much better invariant mass resolution. The estimated acceptance of NKS2 is three (ten) times larger for K-S(0)(Lambda) than that of NKS. The spectrometer is newly constructed and installed at the Laboratory of Nuclear Science, Tohoku University in 2005. The deuterium target data was taken with tagged photon beam in 2006-2007. We will report recent results of NKS2 in this paper. Additionally, a status of the upgrade project that gives us larger acceptance and capability of K-0 + A coincidence measurement will be presented.
Úplný záznam
Effect of Surface Texturing on Friction and Film Thickness under Starved Lubrication Conditions
 Ali, Fadi ; Kaneta, Motohiro (oponent) ; Glovnea, Romeo (oponent) ; Hartl, Martin (vedoucí práce)
This PhD thesis focuses on studying the effects of shallow micro-textures on friction and film thickness of lubricated non-conformal contacts under extreme and starved conditions. Measurements were carried out using a ball-on-disc tribometer equipped with high speed camera and torque sensor. Two types of micro-textures have been assessed in this study, micro-dents and transverse micro-grooves. The results reveal that micro-dents are helpful in reducing friction under starved conditions due to the film thickness enhancement. The mechanism of filling the depleted micro-dents with fresh lubricant is probably attributed to the capillary effect in the inlet zone under starvation. On the other hand, the rubbing surfaces with transverse shallow micro-grooves with a length less than the diameter of the Hertzian contact have an improved tribological performance in comparison with smooth surfaces. Indeed, transverse shallow micro-grooves showed a significant enhancement of film thickness under starvation and under extreme operating condition (reverse motion). The numerical simulation of the transient behavior of transverse limited micro-grooves showed accepted agreement with experimental results.
Úplný záznam
Effects of Non-Newtonian Lubricants on Surface Roughness in Point Contacts
 Ficza, Ildikó ; Kaneta, Motohiro (oponent) ; Poll, Gerhard (oponent) ; Hartl, Martin (vedoucí práce)
This PhD thesis focuses on the study of roughness deformation inside an elastohydrodynamically lubricated point contact. The passage of the roughness feature through the contact zone is modeled using numerical techniques. A single transverse ridge is assumed in the transient EHL model which presents a complex problem with a second order partial differential equation an integro-differential equation. Non-Newtonian fluid behavior is assumed in the model which further increases its complexity. In order to solve the system of equations the multigrid techniques are applied. The thesis contains the mathematical model describing the problem and a detailed description of the multigrid method. The results obtained by the simulations are compared to experimentally evaluated film thickness values. The roughness deformation is observed for a wide range of operating conditions as well as for different lubricant parameters. The effect of these lubricant parameters on the deformation is studied as well.
Úplný záznam

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