Results 31 to 40 of about 130 (116)

Aerostatic Porous Annular Thrust Bearings as Seals

Tribology International
Peer ...
Miettinen Mikael, Viitala Raine, Vainio Valtteri   +2 more
openaire   +2 more sources

MSTMM‐Validated Machining Efficiency and Surface Roughness Improvement Using Evolutionary Optimization Algorithm

International Journal of Mechanical System Dynamics, Volume 5, Issue 2, Page 354-371, June 2025.
ABSTRACT Ultra‐precision machining (UPM) has been extensively employed for the production of high‐end precision components. The process is highly precise, and the associated cost of production is also high. Optimization of machining parameters in UPM can significantly improve machining efficiency and surface roughness. This study proposes an innovative
Adeel Shehzad, Yuanyuan Ding, Yu Chang, Yiheng Chen, Xiaoting Rui, Hanjing Lu   +5 more
wiley   +1 more source

Dynamic Characteristics of Air Cycle Machine Rotor System

Shock and Vibration, Volume 2018, Issue 1, 2018., 2018
Parameters optimization in the critical speed region has the important influence on operational stability of an air cycle machine. Effects of bearing stiffness and unbalanced exciting force on critical speed and response characteristics are investigated by the modal method and harmonic response analysis.
Dongjiang Han, Long Hao, Jinfu Yang, Filippo Ubertini   +3 more
wiley   +1 more source

Numerical investigation of pressure-equalizing groove configuration effects on gas bearing performance

Frontiers in Mechanical Engineering
High-speed rotating machinery has extremely high requirements for the performance and reliability of aerostatic bearings, and the design of pressure-equalizing groove structure is a key factor determining the performance of aerostatic bearings under high-
Yang Su, Fangjian Wan, Lifang Wang, Hang Xiu, Qi Qin   +4 more
doaj   +1 more source

Experimental Investigation on Off‐Design Performance of a Small‐Scale Two‐Stage Counter‐Rotating Impulse Turbine

International Journal of Energy Research, Volume 2024, Issue 1, 2024.
The high‐efficiency turbine design is of great importance for small‐scale power systems with a high expansion pressure ratio (EPR). A two‐stage counter‐rotating impulse turbine is optional, with the advantages of a high efficiency and a compact size. However, few experimental investigations were reported.
Ningjian Peng, Enhua Wang, Fanxiao Meng, Wen Zhang, Yongzhen Wang, Bo Zhang, Yuxuan Zhao, Enovic Chansa Yenga Yenga, Naveen Sharma   +8 more
wiley   +1 more source

Online‐Offline Optimized Motion Profile for High‐Dynamic Positioning of Ultraprecision Dual Stage

Complexity, Volume 2018, Issue 1, 2018., 2018
The wafer stage in dual‐stage lithographic system is an air‐bearing servo motion platform requiring high positioning accuracy and high transient performance. However, the residual vibration, resulting from almost zero damping, high velocity, parallel decoupling structure, and direct drive, brings about unacceptable overshoot and settling time.
Yang Liu, Yue Dong, Jiubin Tan, Yimin Zhou   +3 more
wiley   +1 more source

Modelling of Aerostatic Bearings with Micro-Hole Restriction

Machines
Aerostatic bearings incorporating micro-hole restrictors with diameters on the order of tens of microns demonstrate superior static and dynamic stiffness characteristics, while significantly reducing air consumption, and are increasingly adopted in ...
Dehong Huo, Amir Fard, Junliang Liu, Ning Gou, Kai Cheng   +4 more
doaj   +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

Study on Dynamic Characteristics of Aerostatic Bearing with Elastic Equalizing Pressure Groove

Shock and Vibration, Volume 2018, Issue 1, 2018., 2018
Microvibration has an important influence on the dynamic performance of aerostatic bearings. Dynamic stiffness and equivalent damping coefficient are the main indexes to evaluate the dynamic characteristics of the aerostatic bearing. In order to study the dynamic characteristics of a new type of aerostatic bearing with the elastic equalizing pressure ...
Xiao-long Zhao, Hao Dong, Zhou Fang, Deng-di Chen, Jun-an Zhang, Luca Landi   +5 more
wiley   +1 more source

COMPARATIVE SIMULATION ANALYSIS OF AEROSTATIC THRUST BEARING AND ORIFICE-TYPE AEROSTATIC THRUST BEARING

Kashf Journal of Multidisciplinary Research
This research presents a comprehensive numerical simulation study comparing the performance of porous-type and orifice-type aerostatic thrust bearings using ANSYS Fluent. Detailed 3D CAD models were developed to reflect realistic geometries, followed by high-quality meshing and parameterized simulations under varying air film thicknesses, restrictor ...
null Muhammad Punhal Sahto, null Syed Nasir Mehdi Gardezi, null Ali Nawaz Sanjrani, null Muhammad Hassan, null Arfa, null Maryam Khan, null Syed Sameer Raza Bukhari, null Hassan Tahir   +7 more
openaire   +1 more source