The Role of Stripe Wear in Causing Acoustic Emissions From Alumina Ceramic-On-Ceramic Bearings

2007 ◽  
Vol 22 (7) ◽  
pp. 47-51 ◽  
Author(s):  
Scott Taylor ◽  
Michael T. Manley ◽  
Kate Sutton
Keyword(s):  
Acoustic Emissions ◽  
Alumina Ceramic ◽  
Ceramic On Ceramic

Edge loading in third generation alumina ceramic-on-ceramic bearings

2004 ◽  
Vol 19 (4) ◽  
pp. 402-413 ◽  
Author(s):  
William L Walter ◽  
Gerard M Insley ◽  
William K Walter ◽  
Michael A Tuke
Keyword(s):  
Alumina Ceramic ◽  
Third Generation ◽  
Edge Loading ◽  
Ceramic On Ceramic

CAA Study of Entropy Noise in Nozzle Flow for the Validation of a 2D Semi-Analytical Model

2017 ◽  
Author(s):  
Ariane Emmanuelli ◽  
Maxime Huet ◽  
Thomas Le Garrec ◽  
Sébastien Ducruix
Keyword(s):  
Acoustic Emissions ◽  
Combustion Noise ◽  
Radial Deformation ◽  
Combustion Instabilities ◽  
Mean Flow ◽  
Reference Case ◽  
1D Model ◽  
Phd Thesis ◽  
Good Agreement

Analytical methods address the need to quickly determine the effect of indirect combustion noise on farfield acoustic emissions and combustion instabilities in order to account for them in new designs. A 2D axisymmetric model for indirect combustion noise through a non-compact nozzle was recently developed by Zheng et al. with this ambition [PhD Thesis, 2016]. An original Computational AeroAcoustics (CAA) approach is applied to serve as a reference case within a framework close to the model’s hypotheses. Results from computations with a Euler mean flow field are compared to the model. Very good agreement is observed, validating the approach. The data is also compared to a 1D model for the non-compact nozzle elaborated by Giauque et al. [J. Eng. Gas. Turb. Power, 134, 2012], demonstrating the importance of 2D effects and the role of radial deformation of the entropy wave.

Influence of Surfactants on Bubble Entrainment

2010 ◽  
Author(s):  
Christopher N. Layman ◽  
John S. Allen ◽  
In Mei Sou
Keyword(s):  
High Speed ◽  
Sound Production ◽  
Liquid Surface ◽  
Acoustic Emissions ◽  
Surface Velocity ◽  
Optical Data ◽  
Formation Mechanisms ◽  
Significant Difference ◽  
Bubble Entrainment

A drop impacting on a liquid surface may entrain a bubble resulting in sounds from the bubble oscillation in addition to that of the initial drop impact. This subject has received considerable interest with respect to the underwater sound produced by rain. The previous optical and acoustical studies have extensively examined the role of drop size and impact velocity as well entrainment formation mechanisms. However, the role of surfactants on the liquid surface has received less attention especially with respect to sound production. One previous study [1] of two different surfactants (Kodak Photoflo and a sulfo detergent) reports that these suppress entrainment resulting in diminished or negligible bubble noise. However, we have found bubble entrainment and acoustic emissions associated with the addition of a heptane layer on the water surface. Using a synchronized hydrophone and a high-speed camera, acoustical and optical data of the bubble drop dynamics were obtained. Particle image velocimetry (PIV) was also utilized to measure the surface velocity produced by the drop. These results show a significant difference in the drop rebound and subsequent fluid column dynamics, which results in a dual acoustic emission for the surfactant case.

Primary Cementless Total Hip Arthroplasty with an Alumina Ceramic-on-Ceramic Bearing

2010 ◽  
Vol 92 (3) ◽  
pp. 639-644 ◽  
Author(s):  
George E Petsatodis ◽  
Pericles P Papadopoulos ◽  
Kyriakos A Papavasiliou ◽  
Ippokratis G Hatzokos ◽  
Filon G Agathangelidis ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Alumina Ceramic ◽  
Total Hip ◽  
Cementless Total Hip Arthroplasty ◽  
Ceramic Bearing ◽  
Ceramic On Ceramic

The role of patient factors and implant position in squeaking of ceramic-on-ceramic total hip replacements

2011 ◽  
Vol 93-B (4) ◽  
pp. 439-442 ◽  
Author(s):  
S. A. Sexton ◽  
E. Yeung ◽  
M. P. Jackson ◽  
S. Rajaratnam ◽  
J. M. Martell ◽  
...  
Keyword(s):  
Patient Factors ◽  
Implant Position ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Hip Replacements ◽  
Ceramic On Ceramic

Osteolysis in Third-Generation Alumina Ceramic-on-Ceramic Hip Bearings With Severe Impingement and Titanium Metallosis

2008 ◽  
Vol 23 (8) ◽  
pp. 1240.e13-1240.e19 ◽  
Author(s):  
Rajmohan Murali ◽  
S. Fiona Bonar ◽  
George Kirsh ◽  
William K. Walter ◽  
William L. Walter
Keyword(s):  
Alumina Ceramic ◽  
Third Generation ◽  
Ceramic On Ceramic
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