RISK LEVEL DETERMINATION OF A DEFECT OF FREIGHT-CAR TRUCK SOLEBAR USING ACOUSTIC EMISSION TECHNIQUE

2016 ◽  
pp. 10-15
Author(s):  
R. G. Tsvaigert ◽  
L. N. Stepanova ◽  
S. I. Kabanov ◽  
V. V. Chernova
Keyword(s):  
Acoustic Emission ◽  
Risk Level ◽  
Acoustic Emission Technique ◽  
Freight Car

Determination of Initial Crack Strength of Silicon Die Using Acoustic Emission Technique

2015 ◽  
Vol 44 (7) ◽  
pp. 2497-2506 ◽  
Author(s):  
Pei-Chi Chen ◽  
Yen-Fu Su ◽  
Shin-Yueh Yang ◽  
Steven Y. Liang ◽  
Kuo-Ning Chiang
Keyword(s):  
Acoustic Emission ◽  
Initial Crack ◽  
Acoustic Emission Technique

The Acoustic Emission Diagnose and Analysis of Journal Bearing‘s Inner Ring Looseness Fault by Truck Wheel

2011 ◽  
Vol 130-134 ◽  
pp. 54-57
Author(s):  
Hai Chao Cai ◽  
Dong Feng Wang ◽  
Qiao Yu Xu ◽  
Zhen Dong Shang
Keyword(s):  
Acoustic Emission ◽  
Wavelet Packet ◽  
Characteristic Parameter ◽  
Present Condition ◽  
Acoustic Emission Technique ◽  
Railway Freight ◽  
Freight Car ◽  
Dynamic Loading Conditions ◽  
Emission Detection ◽  
Railway Freight Car

In this paper, we combine the characteristics of acoustic emission detection with the present condition of truck rolling bearing’s fault detection ,adopting the acoustic emission technique to examine railway freight car ’s journal bearing inner ring looseness .We put forward the method which wavelet packet analyze and withdraw bearing acoustic emission signal’s feature vector. Through the energy distribution comparison of inner ring’s non-looseness and looseness, we extract the ratio between high frequency’s internal energy and total energy as the characteristic parameter , which can recognize the inner ring’s loose fault effectively. Acoustic emission technique is a dynamic detection method, which can get materials’ important information,fatigue crack propagation,under the dynamic loading conditions. In comparison with the traditional vibration detection, it has the characteristics of the early prediction of bearing fault.

INVESTIGATION OF MECHANICAL DAMPING CHARACTERISTIC IN SHORT FIBERGLASS REINFORCED POLYCARBONATE COMPOSITES

2013 ◽  
Vol 27 (15) ◽  
pp. 1350108 ◽  
Author(s):  
MYOUNG-RAE CHO ◽  
HYUNG-ICK KIM ◽  
JAE-SOON JANG ◽  
JONGHWAN SUHR ◽  
DEVIN R. PRATE ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Composite Materials ◽  
Polymer Composites ◽  
Tensile Testing ◽  
Damping Properties ◽  
Cyclic Testing ◽  
Acoustic Emission Technique ◽  
Stick Slip ◽  
Reinforced Polymer

The focus of this study is to experimentally investigate the effect of debonding stress, the interface between the fibers and the polymer matrix, on the damping properties of the short fiberglass reinforced polymer composites. In this study, short fiberglass reinforced polycarbonate composite materials were fabricated and characterized for their tensile properties by varying the fiberglass loading fraction. The debonding stress was evaluated by coupling the acoustic emission technique with the tensile testing. After the determination of the debonding stress was completed, dynamic cyclic testing was performed in order to investigate the effect of debonding on the damping properties of the polymer composites. It was experimentally observed in this study that the debonding can facilitate the stick-slip friction under cyclic loadings, which then gives rise to better damping performance in the fiberglass composites.

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