Formation Mechanism of Micro-vibration in Aerostatic Bearing Used in Miniature Aircraft Engine

2017 ◽  
pp. 937-952
Author(s):  
Wei Long ◽  
Shao-hua Yang ◽  
Ling Gong
Keyword(s):  
Formation Mechanism ◽  
Aircraft Engine ◽  
Aerostatic Bearing ◽  
Micro Vibration

Performance Study of Aerostatic Bearings with Arrayed Microhole Restrictors

2011 ◽  
Vol 311-313 ◽  
pp. 386-391
Author(s):  
Peng Li ◽  
Han Chen ◽  
Xue Dong Chen
Keyword(s):  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Aerostatic Bearing ◽  
Performance Study ◽  
Load Carrying ◽  
Ultra Precision ◽  
New Type ◽  
Computational Fluid Dynamics Cfd ◽  
Aerostatic Bearings ◽  
Micro Vibration

Micro-vibration of aerostatic bearings has been the bottleneck in the improvement of the moving and positioning accuracy of ultra-precision fabrication and metrology equipments. In this study, a new type of aerostatic bearing restrictor has been proposed. The prototype of arrayed microhole restrictor, instead of the conventional single hole restrictor was developed with the aim of reducing the harmful micro-vibration of aerostatic bearings. Computational fluid dynamics (CFD) was employed to numerically calculate the air flow field. It is found that the employment of arrayed microhole restrictors can reduce the amount of micro-vibration while maintain the load carrying capacity and stiffness of the aerostatic bearing. Experimental measurement of the micro-vibration confirms the effectiveness of this new type of restrictor.

scholarly journals Micro-Vibration Analysis and Optimization of Aerostatic Bearing with Pocketed Orifice-Type Restrictor

2018 ◽  
Vol 11 (4) ◽  
pp. 1115-1124
Author(s):  
Y. F. Li ◽  
Y. H. Yin ◽  
H. Yang ◽  
X. E. Liu ◽  
J. Mo ◽  
...  
Keyword(s):  
Vibration Analysis ◽  
Aerostatic Bearing ◽  
Micro Vibration

High-Temperature Instability of A Cr2Nb-Nb(Cr) Microlaminate Composite

1996 ◽  
Vol 54 ◽  
pp. 374-375
Author(s):  
M. Larsen ◽  
R.G. Rowe ◽  
D.W. Skelly
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
High Temperature ◽  
Elevated Temperatures ◽  
Aircraft Engine ◽  
Lattice Parameter ◽  
Microstructural Stability ◽  
Elevated Temperature Strength ◽  
Cross Sectional ◽  
Bcc Structure

Microlaminate composites consisting of alternating layers of a high temperature intermetallic compound for elevated temperature strength and a ductile refractory metal for toughening may have uses in aircraft engine turbines. Microstructural stability at elevated temperatures is a crucial requirement for these composites. A microlaminate composite consisting of alternating layers of Cr2Nb and Nb(Cr) was produced by vapor phase deposition. The stability of the layers at elevated temperatures was investigated by cross-sectional TEM.The as-deposited composite consists of layers of a Nb(Cr) solid solution with a composition in atomic percent of 91% Nb and 9% Cr. It has a bcc structure with highly elongated grains. Alternating with this Nb(Cr) layer is the Cr2Nb layer. However, this layer has deposited as a fine grain Cr(Nb) solid solution with a metastable bcc structure and a lattice parameter about half way between that of pure Nb and pure Cr. The atomic composition of this layer is 60% Cr and 40% Nb. The interface between the layers in the as-deposited condition appears very flat (figure 1). After a two hour, 1200 °C heat treatment, the metastable Cr(Nb) layer transforms to the Cr2Nb phase with the C15 cubic structure. Grain coarsening occurs in the Nb(Cr) layer and the interface between the layers roughen. The roughening of the interface is a prelude to an instability of the interface at higher heat treatment temperatures with perturbations of the Cr2Nb grains penetrating into the Nb(Cr) layer.

Report and discussion on “A philosophy of aircraft engine manufacture”

1965 ◽  
Vol 44 (7) ◽  
pp. 344
Author(s):  
L.R. Beesly ◽  
Morley ◽  
W.S. Hollis ◽  
Higson Smith ◽  
G.A.J. Witton ◽  
...  
Keyword(s):  
Aircraft Engine
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