Results 41 to 50 of about 661 (213)
Mathematical Problems in Engineering, Volume 2021, Issue 1, 2021., 2021 For decades, maximum power coefficient limit, known as the Betz limit, has been accepted as a theoretical optimum value for wind turbine power extraction; nevertheless, some reports, exceeding this limit, have already been published. To explain this phenomenon and show a different point of view, a novel theoretical and ideal analysis based on flow ...
José Genaro González-Hernández +2 more
wiley +1 more source
Permeability and dynamic elastic moduli of controlled porosity ultra-precision aerostatic structures [PDF]
, 2014 Porous ceramic aerostatic bearings enable precise and smooth motion and improved stiffness compared with widely used orifice restrictor bearings. However, the processing techniques so far used are too complex or rely in lowering the sintering temperature
Corbett, John +2 more
core +1 more source
On the Design of a Diaphragm Valve for Aerostatic Bearings [PDF]
E3S Web of Conferences, 2020 Because of their almost zero friction, cleanness and long life, aerostatic bearings are commonly used in many applications where high precision of positioning is required, e.g. machine tools, measuring machines, semiconductor manufacturing and power board testing. However, air bearings suffer from low relative stiffness and poor damping.
Lentini Luigi +4 more
openaire +2 more sources
Experimental Identification of an Aerostatic Thrust Bearing [PDF]
, 2016 Conventional approaches to design aerostatic bearings are based on their static characteristics. However, dynamic predictions are fundamental in order to obtain very precise positioning since air bearings are frequently subjected to dynamic load variations.
COLOMBO, FEDERICO +3 more
openaire +1 more source
Lubricants, 2020 As aerostatic bearings are used in high-speed metal-cutting machines to increase machining accuracy, there is the need to improve their characteristics, including compliance, which is usually high.
Vladimir Kodnyanko +3 more
doaj +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).
Schimpf, Artur
core +1 more source
Lubricants, 2021 Even though the behavior of aerostatic bearings has for long been the topic of extensive research, there are still many aspects that require further investigation.
Federico Colombo +4 more
doaj +1 more source
Advances in Mechanical Engineering, 2021 This study adopts the DMT(dynamic mesh technology) and UDF(user defined functions) co-simulation method to study the dynamic characteristics of aerostatic thrust bearings with equalizing grooves and compare with the bearing without equalizing groove ...
Ruzhong Yan, Haojie Zhang
doaj +1 more source
FEEDING SYSTEM OF AEROSTATIC BEARINGS WITH POROUS MEDIA
Proceedings of the JFPS International Symposium on Fluid Power, 2005 In porous resistances, Darcy’s law provides a good approximation of mass flow rate when the differences between upstream and downstream pressures are sufficiently small. In this range, the mass flow rates are proportional to the porous resistance’s permeability.
BELFORTE, GUIDO +3 more
openaire +5 more sources
Applied Sciences, 2021 Aerostatic bearings are attractive, with minimal friction losses, high durability, and environmental friendliness. However, such designs have a number of disadvantages, including low load-bearing capacity and high compliance due to high air ...
Vladimir Kodnyanko +7 more
doaj +1 more source