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Wyświetlanie 1-15 z 339
Tytuł:
A Brief Review on NDT&E Methods For Structural Aircraft Components
Autorzy:
Wronkowicz-Katunin, A.
Powiązania:
https://bibliotekanauki.pl/articles/97992.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
NDT&E methods
non-destructive testing
non-destructive evaluation
aircraft structures
composite structures
Opis:
The paper presents a summary of non-destructive testing and evaluation (NDT&E) methods applied in inspections of structural aircraft components. This brief review covers the most commonly applied methods such as visual and penetrant inspections, tap-testing, eddy current inspections, shearography, thermography, acoustic emission testing, radiographic and tomographic inspections, and ultrasonic inspections. The general operating principles of these methods as well as their main advantages, limitations and application areas are described below.
Źródło:
Fatigue of Aircraft Structures; 2018, 10; 73-81
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contribution of acoustic emission into optimal bearing lubrication
Autorzy:
Ziegler, B.
Powiązania:
https://bibliotekanauki.pl/articles/242681.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
non-destructive testing
acoustic emission
Opis:
This article describes the bases of the acoustic emission analysis to make successful applications in the range of the tribological problems, especially at machinery slide journal bearings. Acoustic emission differs from ultrasonic testing, which actively probes the structure; Acoustic emission listens for emissions from active defects and is very sensitive to defect activity when a structure is loaded beyond its service load. During detecting and analysing the generated acoustic emission we earn information about the behaviour, state or quality of these acoustic emission sources. A lot of different sources are generating acoustic emission (e.g. corrosion processes, fluid friction, cracks, cutting processes). This paper shows the acoustic emission sources, the wave propagation, the mode conversion, the damping, the design of a typical transducer and the whole measurement chain. The piezoelectric disc, the "heart" of a typical acoustic emission transducer, converts the incoming mechanical wave into a corresponding electrical signal. Every transducer has its own characteristic, if this is unknown we can test it with difficult methods e.g. so called reciprocal method. On the end of this paper the signal parameters (burst-count, rise-time, signal-duration, signal peak amplitude, signal energy and root-mean-square) will be discussed.
Źródło:
Journal of KONES; 2007, 14, 4; 571-578
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On roughness measurement by angular speckle correlation
Autorzy:
Salazar, F.
Belenguer, T.
García, J.
Ramos, G.
Powiązania:
https://bibliotekanauki.pl/articles/220643.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
roughness
speckle
non-destructive testing
Opis:
In this work, the influence of both characteristics of the lens and misalignment of the incident beams on roughness measurement is presented. To investigate how the focal length and diameter affect the degree of correlation between the speckle patterns, a set of experiments with different lenses is performed. On the other hand, the roughness when the beams separated by an amount are non-coincident at the same point on the sample is measured. To conclude the study, the uncertainty of the method is calculated.
Źródło:
Metrology and Measurement Systems; 2012, 19, 2; 373-380
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of the Quality of the Thick-Walled S355J2+N Steel Joint Welded by the MAG Method
Autorzy:
Krawczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/353891.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
welding
properties of joints
structural steel
non-destructive testing
destructive testing
optimizing welding conditions
Opis:
An analysis of the quality of the thick-walled S355J2+N steel welded joint used most frequently in the general-building, power and other contemporary steel constructions is presented in the following article. A process of examining welding technologies was made on the tick-walled butt joints of plates by using the MAG – 135 welding method. The aim of the discussed topic was to optimize the process of welding thick-walled welded joints due to their mechanical strength properties and efficiency.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 833-839
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of active destructive processes as a diagnostic tool for the structure technical state evaluation
Autorzy:
Goszczyńska, B.
Świt, G.
Trąmpczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/201970.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
monitoring
destructive process
destructive process location
model AE database for damage processes
service load
Opis:
In this paper, a global monitoring system based on the measurement of acoustic emission (AE) due to active deterioration processes is presented. This allows us to examine the entire volume of an element and to locate and identify the type and the dynamics of the deterioration processes under service conditions. The resulting data are used to determine and locate the damage processes that are dangerous in construction made of pre-stress concrete, steel and fiber glass and to assess the general condition of the structure.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 97-109
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approach to evaluation of time to the critical degradation of ship pipelines
Autorzy:
Liberacki, R.
Powiązania:
https://bibliotekanauki.pl/articles/2073655.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
reliability
pipeline
critical degradation
destructive phenomena
Opis:
In the article an approach to the problem of estimating time to the critical degradation of ship pipelines is considered. Such an assessment would consist of six stages. The fundamental idea is to include to the estimation of time to failure of pipelines such elements like: materials that the pipelines are made, destructive physical phenomena taking place in them and applied means of protection. The result of that evaluation should be mean time to critical degradation of pipeline. The mean time should be given with the measure of the spread like the standard deviation. Another possibility is to express the time to failure in the form of a fuzzy number. This would indicate uncertainty of the estimation.
Źródło:
Journal of Polish CIMEEAC; 2015, 10, 1; 85--89
1231-3998
Pojawia się w:
Journal of Polish CIMEEAC
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The method of estimating lifetimes of aircraft devices operating under ageing-attributable wearing conditions
Autorzy:
Ważny, M.
Powiązania:
https://bibliotekanauki.pl/articles/281271.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
reliability
lifetime
destructive processes
permissible condition
Opis:
The paper presents a probabilistic method of assessing lifetimes of selected structural components or assemblies of devices/systems affected by destructive processes that occur during aircraft operation. Reliability status of the device is evaluated by means of diagnostic or operational parameters. It is assumed that these devices (systems, assemblies) operate reliably if effects of wear and tear processes described by diagnostic parameters do not exceed boundary conditions/regimes. From the mathematical aspect, the method has been based on difference equations from which, when rearranged, a partial differential equation of the Fokker-Planck type is derived. A density function of the component wearing is a particular solution to this equation. With the density function of the component wearing applied, after suitable rearrangements, one can determine a density function of time for the exceeding the boundary condition. Now, with the density function of time of reaching the boundary condition found, and after rearrangement of this function, one receives dependences that can be applied to determine lifetime of the device given consideration. An example at the end of the paper illustrates how this method can be applied to analyse an airborne sighting system.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 4; 981-990
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the current state of the concrete structure of the tribune
Ocena bieżącego stanu konstrukcji betonowej trybuny
Autorzy:
Brodňan, Miroslav
Koteš, Peter
Powiązania:
https://bibliotekanauki.pl/articles/402326.pdf
Data publikacji:
2020
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
reinforced concrete
tribune
diagnostics
non-destructive testing
destructive testing
żelbet
trybuna
diagnostyka
badania nieniszczące
badania niszczące
Opis:
The paper is focused on diagnostics of reinforced concrete structure of the tribune of Závodisko Bratislava. The structure was realized by a combination of monolithic and prefabricated concrete elements as well as steel load-bearing elements. The complex state of the rough construction was evaluated, including the verification survey of the foundation of the construction. Non-destructive and destructive methods were used. Based on the results of the diagnostics and recalculation, it was decided to further progress the finish of the tribune.
Artykuł koncentruje się na diagnostyce konstrukcji żelbetowej trybuny zlokalizowanej na „Závodisko Bratysława”. Konstrukcja została zrealizowana przez połączenie monolitycznych i prefabrykowanych elementów betonowych oraz stalowych elementów nośnych. Oceniono złożony stan konstrukcji, w tym badanie weryfikacyjne fundamentu konstrukcji. Zastosowano metody nieniszczące i niszczące. Na podstawie wyników diagnostyki i ponownych obliczeń zdecydowano odalszych działaniach, aby ukończyć trybunę.
Źródło:
Structure and Environment; 2020, 12, 2; 72-76
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wieloprocesowe ujęcie eksploatacji układu komunikacji
A multiprocess approach to an operation of communication system
Autorzy:
Bednarek, M.
Będkowski, L.
Dąbrowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/328083.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
proces destrukcyjny
proces przeciwdestrukcyjny
system dozorująco-terapeutyczny
destructive process
anti-destructive process
supervision and therapeutic system
Opis:
W artykule przedstawiono eksploatację układu komunikacji w ujęciu wieloprocesowym. Układ komunikacji łączy stację procesową i stację operatorską (diagnostyczną) rozproszonego systemu sterowania. Scharakteryzowano komunikację pomiędzy komputerem nadrzędnym (master) a sterownikiem (slave). W procesie eksploatacji układu komunikacji wyróżniono trzy współbieżne procesy: proces użytkowania, który prowadzi do osiągnięcia wymaganego efektu użytkowego; proces destrukcyjny prowadzący do utraty zdatności i proces przeciwdestrukcyjny zapobiegający inicjacji i hamujący lub przerywający proces destrukcyjny. Przedstawiono procedury przeciwdestrukcyjne systemu dozorująco-terapeutycznego z uwzględnieniem podprocesów procesu przeciwdestrukcyjnego: osłonowego, interwencyjnego i przeciwawaryjnego.
The operation of a communication system in a multiprocess approach is presented in the article. The communication system connects a process station and an operator station (diagnostic) of a distributed control system. The communication between a host computer (master) and a controller (slave) is briefly characterized. During the operation of the communication system three concurrent processes are differentiated: a usage process leading to a required effect of use; a destructive process causing loss of the fitness and an anti-destructive process preventing or stopping the destructive process. The anti-destructive procedures of supervision and therapeutic system are given, considering sub-processes of the anti-destructive process: protective, intervention and anti-breakdown ones.
Źródło:
Diagnostyka; 2005, 34; 37-42
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-destructive and semi-destructive diagnostics of concrete structures in assessment of their durability
Autorzy:
Hoła, J.
Bień, J.
Sadowski, Ł.
Schabowicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/199847.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
concrete
durability
diagnostics
non-destructive tests
semi-destructive tests
trwałość betonu
diagnostyka
testy niedestrukcyjne
testy pół-destrukcyjne
Opis:
This paper proposes a comprehensive classification of test methods for the diagnosis of concrete structures. The main focus is on the ranges of suitability of the particular methods and techniques for assessing the durability of structures, depending on the principal degradation mechanisms and their effects on this durability. The survey covers non-destructive testing (NDT) methods, which do not in any way breach the integrity of the tested structures, and semi-destructive testing (SDT) methods requiring material samples to be taken or any other minor breach of structural integrity. An original taxonomy of physical, chemical and biological diagnostic methods, useful in assessment of concrete structures durability, is proposed. Equipment specific for selected advanced testing methods is presented as well as exemplary test results.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 87-96
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rosja Aleksandra Wata – Czesławowi Miłoszowi ukazana
Wat’s and Miłosz’s Russia
Autorzy:
Kaźmierczyk, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/482227.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
sect
communism
destructive force
possession
conversion
freedom
Opis:
The article displays the image of Russia through the eyes of Wat in reference to the mental Russia of Miłosz. It discusses the similarities and differences of both of the views. It indicates the affinities in experiencing the communist Russia by Avant-garde poets – futurists and poets affiliated to “Żagary” magazine. The author proves that Wat’s narration in My Century organizes the dualism of the declining West and the revolutionary East. The article’s author reveals the mistake of mixing the negative data of existence with the political reality. He indicates that this contamination resulted in Wat’s idiosyncrasy towards the Mediterranean culture and expectation for its destruction by the communist revolution. He emphasizes the dual relict nature of revolutionary eschatology. The article shows the reasons for Wat’s ideological enslavement and process of liberating from the influence of communist utopia in the reality of imprisoning Wat and exiling him deep into the empire.
Źródło:
Acta Polono-Ruthenica; 2017, 4, XXII; 33-46
1427-549X
Pojawia się w:
Acta Polono-Ruthenica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A model for service life control of selected device systems
Autorzy:
Zieja, M.
Ważny, M.
Powiązania:
https://bibliotekanauki.pl/articles/259281.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
reliability
unreliability
durability
service lifetime
destructive processes
Opis:
This paper presents a way of determining distribution of limit state exceedence time by a diagnostic parameter which determines accuracy of maintaining zero state. For calculations it was assumed that the diagnostic parameter is deviation from nominal value (zero state). Change of deviation value occurs as a result of destructive processes which occur during service. For estimation of deviation increasing rate in probabilistic sense, was used a difference equation from which, after transformation, Fokker-Planck differential equation was obtained [4, 11]. A particular solution of the equation is deviation increasing rate density function which was used for determining exceedance probability of limit state. The so-determined probability was then used to determine density function of limit state exceedance time, by increasing deviation. Having at disposal the density function of limit state exceedance time one determined service life of a system of maladjustment. In the end, a numerical example based on operational data of selected aircraft [weapon] sights was presented. The elaborated method can be also applied to determining residual life of shipboard devices whose technical state is determined on the basis of analysis of values of diagnostic parameters.
Źródło:
Polish Maritime Research; 2014, 2; 45-49
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved Accuracy of Damage Index Evaluation in Concrete Structures by Simultaneous Hardware Triggering
Autorzy:
Lamonaca, F.
Carrozzini, A.
Grimaldi, D.
Olivito, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/221422.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic emission
multi-triggering
non-destructive techniques
Opis:
Non-invasive damage monitoring of concrete structures by means of Acoustic Emission (AE) requires multitransducers, multi-channel acquisition, high sampling frequency and long observation time. Owing to its propagation in concrete, the signal from AE reduces its amplitude during the propagation, and, consequently, some events can be lost due to lower signal intensity than the trigger level set on one sensor only. The innovative proposal discussed in the paper consists in the introduction of a Flat Amplifier and Trigger generator block (FAT) in order to generate a logical trigger when the AE is detected by any transducer. Experimental tests confirm the effectiveness of the FAT to acquire all the AE events and to increase the evaluation accuracy of damage indexes.
Źródło:
Metrology and Measurement Systems; 2014, 21, 2; 341-350
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Damage Detection and Size Quantification of FML with the Use of NDE
Autorzy:
Dragan, K.
Kornas, Ł.
Kosmatka, M.
Leski, A.
Sałaciński, M.
Synaszko, P.
Bieniaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/98012.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
fibre metal laminates
composites
non-destructive testing
Opis:
Composite materials have been developed in recent years. A new generation of structural composite materials for advanced aircraft is Fibre Metal Laminates (FML). They are hybrid composites consisting of alternating thin layers of metal sheets and fiber-reinforced composite material. FMLs have both low weight and good mechanical properties (high damage tolerance: fatigue and impact characteristics, corrosion and fire resistance). Quality control of materials and structures in aircraft is an important issue, also for Fibre Metal Laminates. For FML parts, a 100% non-destructive inspection for internal quality during the manufacturing process is required. In the case of FML composites, the most relevant defects that should be detected by non-destructive testing are porosity and delaminations. In this paper, a number of different non-destructive methods for the inspection of Fibre Metal Laminates were studied. The possibility of quality control of manufactured FML laminates - detection of defects as well as the procedures and processes are presented and discussed.
Źródło:
Fatigue of Aircraft Structures; 2012, 4; 5-9
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ionising Radiation in Non-destructive Testing, Part 1 Types of Radiation used for Radiographic Testing – Basic Properties and Mechanism of Image Recording
Autorzy:
Ostromęcka, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/27311594.pdf
Data publikacji:
2023
Wydawca:
Instytut Kolejnictwa
Tematy:
ionising radiation
non-destructive testing
industrial radiography
Opis:
Electromagnetic radiation, which is a special example of the electromagnetic field, has been present in the universe since its creation. Examples of radiation include radio waves, X-rays, and visible light. Depending on the frequency of the emitted electromagnetic wave, it can be ionising or non-ionising. Ionising radiation, due to its ability to penetrate matter, is often used in many areas of life. In industry, it is used for diagnostic purposes, e.g. in radiography.
Źródło:
Problemy Kolejnictwa; 2023, 198; 141--146
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 339

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