Results 21 to 30 of about 153 (135)

Experimental Investigation of the Dynamic Response of Squeeze Film Dampers Made of Steel and Glass/Epoxy

Shock and Vibration, Volume 15, Issue 6, Page 631-637, 2008., 2008
This work is devoted to the fabrication and investigation of the Squeeze Film Dampers (SFDs) which are widely used in many applications. This include the fabrication of a test rig and several dampers with different sizes and two different materials which composite and non‐composite.
Waleed F. Faris, Asad A. Khalid, A. Albagul, Godem A. Ismail   +3 more
wiley   +1 more source

Performance Investigation of Micro-Orifice Restricted High-Speed Aerostatic Journal Bearings Based on the Finite Element Method

Machines
Advancements in manufacturing technology have facilitated the use of micro-orifice restrictors (MORs) in aerostatic bearings. However, the understanding of their effectiveness in journal bearings remains limited.
Siyu Gao, Zhuang Li, Tianle Jiang, Hongbin Yang, Laiyun Song, Min Zhu, Jiaheng Yin, Lihua Lu, Qiang Gao, Hanqian Zhang   +9 more
doaj   +1 more source

Static and Dynamic Analysis of Porous Gas Bearings Lubricated With Air, Refrigerant R‐134a, Helium and Hydrogen

Lubrication Science, EarlyView.
ABSTRACT Porous gas bearings (PGBs) enable high‐speed, oil‐free operation in modern rotating machinery. This study develops a coupled thermo‐hydrodynamic (THD) model for a cylindrical porous gas bearing lubricated with four working fluids—air, R‐134a, helium and hydrogen.
S. Bechiri, B. Bouchehit, B. Bou‐Saïd
wiley   +1 more source

Performance Analysis of Thermal and Surface Roughness Effect of Slider Bearings with Unsteady Fluid Film Lubricant Using Finite Element Method

Journal of Applied Mathematics, Volume 2024, Issue 1, 2024.
The streamline upwind Petrov‐Galerkin (SUPG) finite element method was used in this study to investigate the thermal and surface roughness effects on an inclined slider bearing with an unsteady fluid film. One‐dimensional transverse and longitudinal surface roughness models were considered with the supposition that roughness is stochastic and has a ...
Girma Desu Tessema, Getachew Adamu Derese, Awoke Andargie Tiruneh, Qiankun Song   +3 more
wiley   +1 more source

Bearing Performance Analysis of the Thermal and Surface Roughness Effects by Finite Element Method on Slider Bearings Through Non‐Newtonian Fluid‐Type Lubricant

International Journal of Aerospace Engineering, Volume 2024, Issue 1, 2024.
The finite element method was used in this study to explore the impact of surface roughness and thermal characteristics on slider bearings with non‐Newtonian power‐law fluid flow lubricant. One‐dimensional transverse and longitudinal surface roughness models were considered under the stochastic assumption that roughness has a Gaussian random ...
Girma Desu Tessema, Getachew Adamu Derese, Awoke Andargie Tiruneh, Marco Pizzarelli   +3 more
wiley   +1 more source

Aerostatic Journal Bearing based on an Orthotropic Layered Porous Structure [PDF]

, 2023
The present thesis describes the experimental performance determination and numerical modeling of an aerostatic porous bearing made of an orthotropically layered ceramic composite material (CMC). The high temperature resistance, low thermal expansion and high reusability of this material makes it eminently suitable for use in highly stressed fluid-film
openaire   +3 more sources

Vibration Analysis of Bearing-rotor System Based on Nonlinear Dynamic Characteristics

工程科学与技术, 2019
With the wide application of the aerostatic spindle in the ultra-precision machining process, the requirements for the kinematic precision of the spindle are increasing.
Dongju CHEN, Jihong HAN, Xue GAO, Jinwei FAN   +3 more
doaj  

Pneumatic hammer instability in the aerostatic journal bearing–rotor system: A theoretical and experimental analyses

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2020
In this study, the pneumatic hammer instability phenomena in the aerostatic journal bearing–rotor system is analysed and discussed for different feeding hole configurations theoretically and experimentally. The influences of the configuration of the feeding holes on the nonlinear dynamics of the system are also investigated.
Abdurrahim Dal, Tuncay Karaçay
openaire   +3 more sources

Numerical Investigation of Compressible Flow within Aerostatic Journal Bearing.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B, 1999
Aerostatic journal bearings are employed in a lot of engineering fields because of the high endurance under severe conditions in current technology. However, it is difficult to investigate the flowfield experimentally, since the flow region of an aerostatic journal bearing is formed by a clearance of micron order.
KAMIYAMA, Takeshi, YAMAMOTO, Makoto
openaire   +2 more sources

Instability of Aerostatic Journal Bearings with Porous Floating Bush at High Speeds

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C, 2008
Recently, demands of higher rotational speeds and rotational accuracy to aerostatic spindles used in machine tools such as a drilling machine for printed circuit board and a milling machine for manufacturing very small precise parts have been remarkably increasing.
MIYATAKE, Masaaki, YOSHIMOTO, Shigeka, CHIBA, Tomoaki, CHIBA, Akira   +3 more
openaire   +2 more sources