Multi-Element Lamb Wave Transducers to Classify Damage Type and Characterize Size Based on Modal Content

2016 ◽  
Author(s):  
Baiyang Ren ◽  
Cliff J. Lissenden
Keyword(s):  
Structural Integrity ◽  
Linear Array ◽  
Lamb Waves ◽  
Remaining Useful Life ◽  
Sensing Technology ◽  
Low Profile ◽  
Useful Life ◽  
And Function ◽  
Damage Type

Assessing the structural integrity of PVP systems entails a hierarchical process to detect, locate, classify, and size damage in order to predict the remaining useful life of the system. Technologies to detect and locate damage have been researched intensely over the years, but classification and sizing of damage remains a challenging problem. In this work advanced sensing technology is employed to send and receive Lamb waves in plates. The receiver is a 16-element linear array that is made from PVDF; thus it is lightweight, low profile, flexible, inexpensive, and has minimal cross talk. The receiver has two novel capabilities that open new opportunities in diagnostics and prognostics: measurement of group velocity and determination of modal content. The actuator and receiver are intended to stay in place and function in a pitch-catch mode. The use of modal content to classify the type of damage as well as to size the defect is demonstrated.

Sewer rehabilitation strategy in Berlin

2002 ◽  
Vol 46 (6-7) ◽  
pp. 379-387
Author(s):  
D. Jacobi ◽  
K.-J. Sympher
Keyword(s):  
Structural Integrity ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Remaining Useful Life ◽  
Sewer System ◽  
Sewer Systems ◽  
Catchment Areas ◽  
Sewer Rehabilitation ◽  
Useful Life ◽  
Rehabilitation Strategy

Berlin Wasserbetriebe is in need of a significant and longterm investment in the rehabilitation of its sewer system. With ratification of the European Standard EN 752 Part 5, comprehensive rules have been set out for the rehabilitation of drain and sewer systems: hydraulic performance, environmental impact and structural integrity of complete catchment areas are given equal consideration. Taking this into account, Berliner Wasserbetriebe has developed a sewer rehabilitation strategy. Economic aspects are integrated with a cost-benefit-analysis; the significance of the remaining useful life of a pipe section is examined.

scholarly journals A Fault-Signal-Based Generalizing Remaining Useful Life Prognostics Method for Wheel Hub Bearings

2019 ◽  
Vol 9 (6) ◽  
pp. 1080 ◽  
Author(s):  
Shixi Tang ◽  
Jinan Gu ◽  
Keming Tang ◽  
Rong Zou ◽  
Xiaohong Sun ◽  
...  
Keyword(s):  
Fatigue Damage ◽  
Remaining Useful Life ◽  
Working Environment ◽  
Short Term ◽  
Signal Model ◽  
Useful Life ◽  
Simplified Solution ◽  
Damage Type ◽  
Damage Types

The goal of this work is to improve the generalization of remaining useful life (RUL) prognostics for wheel hub bearings. The traditional life prognostics methods assume that the data used in RUL prognostics is composed of one specific fatigue damage type, the data used in RUL prognostics is accurate, and the RUL prognostics are conducted in the short term. Due to which, a generalizing RUL prognostics method is designed based on fault signal data. Firstly, the fault signal model is designed with the signal in a complex and mutative environment. Then, the generalizing RUL prognostics method is designed based on the fault signal model. Lastly, the simplified solution of the generalizing RUL prognostics method is deduced. The experimental results show that the proposed method gained good accuracies for RUL prognostics for all the amplitude, energy, and kurtosis features with fatigue damage types. The proposed method can process inaccurate fault signals with different kinds of noise in the actual working environment, and it can be conducted in the long term. Therefore, the RUL prognostics method has a good generalization.

Determination of Remaining Useful Life in Cyclic Processes

2019 ◽  
Vol 58 (48) ◽  
pp. 22048-22063
Author(s):  
Leonardo M. De Marco ◽  
Jorge Otávio Trierweiler ◽  
Marcelo Farenzena
Keyword(s):  
Remaining Useful Life ◽  
Cyclic Processes ◽  
Useful Life

scholarly journals Determination of Remaining Useful Life of Gas Turbine Blade

2016 ◽  
Vol 38 ◽  
pp. 01011
Author(s):  
Mior Azman Meor Said ◽  
Muhammad Hafizuddin Osman ◽  
Puteri Sri Melor Megat Yusoff ◽  
Shaharin Anwar Sulaiman ◽  
Syed M Afdhal Syed Ahmad Ghazali
Keyword(s):  
Gas Turbine ◽  
Turbine Blade ◽  
Remaining Useful Life ◽  
Gas Turbine Blade ◽  
Useful Life

Applying Principal Component Analysis for Multi-parameter Failure Prognosis and Determination of Remaining Useful Life

2021 ◽  
Author(s):  
Miguel Angelo de Carvalho Michalski ◽  
Renan Favarao da Silva ◽  
Arthur Henrique de Andrade Melani ◽  
Gilberto Francisco Martha de Souza
Keyword(s):  
Principal Component Analysis ◽  
Principal Component ◽  
Component Analysis ◽  
Remaining Useful Life ◽  
Useful Life ◽  
Failure Prognosis

A Structural Integrity Assessment Methodology for Pressurized Vessels

2005 ◽  
Vol 128 (4) ◽  
pp. 541-546 ◽  
Author(s):  
Raymond K. Yee ◽  
Mike Kapper
Keyword(s):  
Power Plants ◽  
Structural Integrity ◽  
Design Tool ◽  
Remaining Useful Life ◽  
Operating Conditions ◽  
Assessment Methodology ◽  
Nondestructive Examination ◽  
Integrity Assessment ◽  
Useful Life ◽  
Steam Drum

Pressurized vessels such as a steam drum in a typical power plant can often experience in-service cracking. Structural integrity assessment methodology can be a useful tool to determine the suitability of a vessel for service. This methodology may include fitness-for-service and remaining useful life analyses of a vessel based on the nondestructive examination (NDE) results and operating conditions. In this paper, the structural integrity assessment methodology applied to a steam drum case study is described. The analysis procedure, material property determination, stress analysis, limiting flaw size evaluation, and remaining useful life evaluation for the drum are discussed. A thermal shock design tool is briefly introduced. Recommendations for appropriate action are also presented. The assessment methodology employed in this paper can be applied to other similar pressurized vessels and structures in power plants.

Conformation of Ribosomes from Escherichia Coli

1974 ◽  
Vol 32 ◽  
pp. 210-211
Author(s):  
M. Boublik ◽  
W. Hellmann ◽  
F. Jenkins
Keyword(s):  
Binding Sites ◽  
Ribosomal Proteins ◽  
Fluorescent Dyes ◽  
Protein Biosynthesis ◽  
Three Dimensional ◽  
Spatial Arrangement ◽  
Dimensional Structure ◽  
Complete Understanding ◽  
And Function

The present knowledge of the three-dimensional structure of ribosomes is far too limited to enable a complete understanding of the various roles which ribosomes play in protein biosynthesis. The spatial arrangement of proteins and ribonuclec acids in ribosomes can be analysed in many ways. Determination of binding sites for individual proteins on ribonuclec acid and locations of the mutual positions of proteins on the ribosome using labeling with fluorescent dyes, cross-linking reagents, neutron-diffraction or antibodies against ribosomal proteins seem to be most successful approaches. Structure and function of ribosomes can be correlated be depleting the complete ribosomes of some proteins to the functionally inactive core and by subsequent partial reconstitution in order to regain active ribosomal particles.

Dynamic Modeling and Wear-Based Remaining Useful Life Prediction of High Power Clutch Systems

2005 ◽  
Vol 48 (2) ◽  
pp. 208-217 ◽  
Author(s):  
Matthew Watson ◽  
Carl Byington ◽  
Douglas Edwards ◽  
Sanket Amin
Keyword(s):  
Dynamic Modeling ◽  
High Power ◽  
Life Prediction ◽  
Remaining Useful Life ◽  
Useful Life
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