scholarly journals Material degradation analysis and maintenance decisions based on material condition monitoring during in-service inspections

1996 ◽  
Author(s):  
A.M. Yacout ◽  
Y. Orechwa
Keyword(s):  
Condition Monitoring ◽  
Material Degradation ◽  
Material Condition ◽  
Degradation Analysis ◽  
Maintenance Decisions

scholarly journals Towards Material-Batch-Aware Tool Condition Monitoring

2021 ◽  
Vol 5 (4) ◽  
pp. 103
Author(s):  
Benjamin Lutz ◽  
Philip Howell ◽  
Daniel Regulin ◽  
Bastian Engelmann ◽  
Jörg Franke
Keyword(s):  
Condition Monitoring ◽  
Manufacturing Process ◽  
High Frequency ◽  
Cutting Tool ◽  
Frequency Control ◽  
Tool Condition Monitoring ◽  
Tool Condition ◽  
Subtractive Manufacturing ◽  
Maintenance Decisions ◽  
Cutting Experiments

In subtractive manufacturing, process monitoring systems are used to observe the manufacturing process, to predict maintenance actions and to suggest process optimizations. One challenge, however, is that the observable signals are influenced not only by the degradation of the cutting tool, but also by deviations in machinability among material batches. Thus it is necessary to first predict the respective material batch before making maintenance decisions. In this study, an approach is shown for batch-aware tool condition monitoring using feature extraction and unsupervised learning to analyze high-frequency control data in order to detect clusters of materials with different machinability, and subsequently optimize the respective manufacturing process. This approach is validated using cutting experiments and implemented as an edge framework.

3327 Material Degradation Analysis of Turbine Rotor Steel by Indentation Test

2006 ◽  
Vol 2006.1 (0) ◽  
pp. 483-484
Author(s):  
Motoki NAKAJIMA ◽  
Tetsuya HONDA ◽  
Shin-ichi KOMAZAKI ◽  
Yutaka KOHNO
Keyword(s):  
Indentation Test ◽  
Turbine Rotor ◽  
Rotor Steel ◽  
Material Degradation ◽  
Degradation Analysis

New Non-Destructive Condition Monitoring Techniques for On-Site Assessment of Low-Voltage Cables

2009 ◽  
Author(s):  
Fabrice M. Guerout ◽  
Ladji Cisse ◽  
Richard Boor
Keyword(s):  
Condition Monitoring ◽  
Low Voltage ◽  
Material Degradation ◽  
Cable Insulation ◽  
Site Assessment ◽  
Site Monitoring ◽  
Nuclear Plants ◽  
Increased Sensitivity ◽  
Degradation Indicator ◽  
Non Destructive

The number of techniques available for on-site monitoring of low-voltage cables at nuclear plants is limited because of the requirement from station personnel to use non-destructive and non-intrusive techniques. This paper summarizes the results obtained to date using two new non-destructive methods. The first technique is based on the indentation of the cable insulation or cable jacket material and the study of post-indentation parameters to characterize the visco-elastic properties of the material tested. The novelty of the technique consists of measuring the time taken by the polymeric material to recover a set portion of the initial deformation and using this duration as a material degradation indicator. The technique can be used locally on the insulation of hook-up cables, on the insulation at the termination of jacketed cables, or directly on cable jackets. The second technique is based on the measurement of electrical dissipation factors (or tan delta) in the insulating material. A broadband frequency tan delta analyser was used to measure electrical dissipation factors at various frequencies, and identify the frequency ranges showing increased sensitivity to cable degradation. Specific electrodes and measurement methods were developed for practical on-site condition monitoring work. The measurement of electrical dissipation factors can be used to assess the local degradation of cable insulation in hook-up cables and global degradation of multi-pair conductor cables. When used on multi-pair conductor cables, the technique presents the advantage of providing a global indication of the cable condition.

Material Degradation Analysis and Reliability Assessment of Residual Life for Service-Exposed Reformer Tubes

2020 ◽  
Vol 29 (8) ◽  
pp. 5458-5466
Author(s):  
Zhiyuan Han ◽  
Luowei Cao ◽  
LiKun Wang ◽  
Chenyang Du ◽  
Xiaolong Qian ◽  
...  
Keyword(s):  
Residual Life ◽  
Reliability Assessment ◽  
Material Degradation ◽  
Degradation Analysis ◽  
Reformer Tubes

Early Detection of the Material Degradation Based on the Integrated Analysis of Diverse Measurement Techniques

2004 ◽  
Vol 261-263 ◽  
pp. 1043-1048
Author(s):  
Tomokazu Kimura ◽  
Yuji Tamaki ◽  
Makoto Takahashi ◽  
Masaharu Kitamura
Keyword(s):  
Early Detection ◽  
Condition Monitoring ◽  
Measurement Techniques ◽  
Test Material ◽  
Integrated Analysis ◽  
Material Degradation ◽  
System Safety ◽  
Test Loop ◽  
Pulse Echo ◽  
Thinning Process

The diverse techniques for condition monitoring of the test material have been applied in the material test loop (System Safety Benchmark Facility: SSBF) simulating the water condition that of the boiling water reactor. In this paper, two methods of condition monitoring are mainly described. One is a thinning process monitoring of material wall by using pulse echo methods with ultrasonic sensors. The other is early detection of a leakage by measuring and analyzing the SSBF parameter and the temperature and humidity in the protector. Although the experiment is still going on, the validity of the proposed methods of condition monitoring has been confirmed.

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