scholarly journals Diagnostic and Measurement System for Marine Engines

2020 ◽  
Vol 15 ◽  
Keyword(s):  
Vibration Analysis ◽  
Decision Aid ◽  
Future Trend ◽  
Non Destructive Testing ◽  
Working Process ◽  
Destructive Testing ◽  
Purity Testing ◽  
Marine Engines ◽  
High Level ◽  
Non Destructive

Modern way of machines’ exploitation, due to their high level of structural complication, requiresproper level of supervising. This is enabled by more than 60 years’ development of the inspection andmaintenance technologies. Nowadays it focuses on preventing the unplanned accidents by detection of prefailure states and predictive a future trend of the machine. To detect the problem and avoid the failure veryimportant and essential is to develop the Non Destructive Testing (NDT) and Condition Monitoring includingassessment of working process, vibration analysis, oil purity testing, endoscopic, ultrasonic and thermalanalysis. The paper presents a design and structure of the Exploitation Decision Aid System dedicated fordiagnosis of marine engines condition. There are also presented examples of results obtained with use of thesystem.

scholarly journals Preliminary Research on Influence of Welding Parameters Strength at Welded Joints in Ribbed Reinforcing Steel

2020 ◽  
Vol 14 (3) ◽  
pp. 369-374
Author(s):  
Željko Bilić ◽  
Ivan Samardžić ◽  
Nedjeljko Mišina ◽  
Katarina Stoić
Keyword(s):  
Welded Joint ◽  
Welding Process ◽  
Welding Parameters ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Butt Welding ◽  
Control Interface ◽  
High Level ◽  
Non Destructive

As already known, no proper control or process control parameter which absolutely guarantees a high level quality of joints made by electro-resistive welding has been established so far, especially when all possible parameters are taken into account during the welding process. Due to the process of butt-welding being very short-lived, ensuring quality of the joints is a difficult and under-researched problem. The application of non-destructive testing methods to the control interface joints is also not reliable. Therefore, further research in this area should concentrate on studying the influence of basic welding parameters, and calculating their direct or indirect impact can serve to achieve a highquality welded joint with for practice sufficient accuracy.

scholarly journals Risk Based Inspection of Jackets Submitted to Through-Wall Cracks

2003 ◽  
Author(s):  
Franck Schoefs ◽  
Mustapha Rguig
Keyword(s):  
Decision Aid ◽  
Structural Integrity ◽  
Offshore Structures ◽  
Probability Of Detection ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Probability Of False Alarm ◽  
The Impact ◽  
Non Destructive ◽  
Rational Process

The actual challenge for the requalification of existing offshore structures through a rational process of reassessment leads to state the importance of Risk Based Inspection methodology. This paper points out the inspection results modelling and their contribution to decision aid tools. The study of the impact of through cracks on structural integrity of jacket platforms is still a challenge. The detection of large cracks is first addressed. In order to minimize inspections and maintenance costs, all the available data from inspection results, such as probability of detection and probability of false alarm, must be addressed, as well as the probability of crack presence. This can be achieved by the use of the decision theory. These capabilities of Non Destructive Testing give a first input for the risk study. A cost function is suggested to introduce this modelling into a risk analysis and is devoted to help rank the NDT tools. The case of large through-wall cracks is specifically addressed.

scholarly journals ENSAIO NÃO DESTRUTIVO (END) DE ANÁLISE DE VIBRAÇÕES APLICADO À MANUTENÇÃO PREDITIVA

2021 ◽  
Vol 9 (209) ◽  
pp. 1-16
Author(s):  
Marcela Esquincalha Luparelli
Keyword(s):  
Supply Chain ◽  
Vibration Analysis ◽  
Electrical Equipment ◽  
Scientific Production ◽  
Predictive Maintenance ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive ◽  
Important Test ◽  
Reduction Of Costs

Predictive maintenance consists of monitoring data obtained from monitoring, with the main results of increasing the availability and reliability of equipment. Several non-destructive testing can be performed by this type of maintenance, with vibration analysis being one of the most common. The aim of this study is to evaluate the relevance of vibration analysis in the context of industrial predictive maintenance, as well as its applicability in mechanical and electrical equipment. The scientific production of this article was based on the experiments carried out by several authors in their areas of expertise, based on bibliographic source. It was concluded that the vibration analysis is an important test for the application of predictive maintenance, being able to be implemented in several equipments, besides being a method that contributes directly to the reduction of costs in the supply chain. Finally, it is necessary to take into account that there are points of attention that must be considered for a more adequate implementation of the method.

Non-Destructive Testing during the Hardening of Alkali-Activated Slag

2015 ◽  
Vol 732 ◽  
pp. 329-332
Author(s):  
Libor Topolář ◽  
Peter Rypák ◽  
Kristýna Šamárková ◽  
Pavel Rovnaník
Keyword(s):  
Acoustic Analysis ◽  
Drying Shrinkage ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Impact Echo ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
High Level ◽  
Non Destructive ◽  
Alkali Activated

Non-destructive acoustic analysis methods, Impact-echo method as a traditional and the Acoustic Emission method as nontraditional method for civil engineering, were used for experiment. This paper reports the experiment during hardening and drying of specimens of alkali activated slag mortars. Alkali activated slag is a material having a great potential to be used in practice. The main drawback of this material is a high level of autogenous and especially drying shrinkage, which causes a deterioration of the mechanical properties. The aim of this paper is introduce the effect of method used and time curing on the microstructure of alkali activated slag mortars. An understanding of microstructure–performance relationships is the key to true understanding of material behaviours.

Non destructive testing of works of art by terahertz analysis

2013 ◽  
Vol 64 (2) ◽  
pp. 21001 ◽  
Author(s):  
Jean-Luc Bodnar ◽  
Jean-Jacques Metayer ◽  
Kamel Mouhoubi ◽  
Vincent Detalle
Keyword(s):  
Non Destructive Testing ◽  
Destructive Testing ◽  
Works Of Art ◽  
Non Destructive
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