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    Wyświetlanie 1-8 z 8
    Tytuł:
    Development of fracture processes in Silesian Carboniferous sandstones
    Autorzy:
    Łukaszewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059621.pdf
    Data publikacji:
    2003
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    fracture process
    relation stress-strain
    acoustic emission
    post-failure stage
    Opis:
    The development of fracture processes in selected Carboniferous rocks from the Upper Silesian Coal Basin is described, with particular regard to the behaviour of rock specimens in the post-failure stage. The fracture processes were monitored using the stress-strain relations, coupled with acoustic emission, recorded during loading. Energy accumulation and dissipation phenomena were observed during rock loading. Cracking was recorded on the stress-strain curves as deformation loops, accompanied by significant stress decreases, and as cyclic increases in acoustic emission activity. Observing and analysing stages of high acoustic emission and stress drops enabled determination of three ways ("schemes") in which fracture originated and developed during the post-critical stage. Scheme I is damage and movement of grains and rock cement, scheme II is destruction of single rock grains of particular resistance, and scheme III is a dislocational and slide deformation of the rock medium.
    Źródło:
    Geological Quarterly; 2003, 47, 1; 29-38
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Failure mode analysis to define process monitoring systems
    Autorzy:
    McLeay, T.
    Turner, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/100045.pdf
    Data publikacji:
    2011
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    fmea
    process monitoring
    Bayesian networks
    PCA
    sensor fusion
    acoustic emission
    Opis:
    The high costs of using skilled operators in production processes has built a demand for reduced manning, 'lights out machining' manufacture. Process monitoring systems have become a widely researched area in recent years since there is a need for intelligent systems to replace the manual intervention in existing processes. Furthermore, using modern sensors and signal processing techniques, monitoring systems can obtain more informatio about a process and therefore reduce costs further though maximised life of cutting tools, optimised cutting parameters and reduced scrap or re-work. With many application areas available, such as tool condition monitoring, chatter avoidance or feedback control of cutting parameters, it is not always apparent what the key aspects required by an intelligent monitoring system are. In addition, different machining processes have different demands and limitations for monitoring. This paper considers an analytical approach to define the requirements of a monitoring system. A process failure mode effect analysis (FMEA) is carried out to determine the weaknesses of current production processes. From this analysis, the relationships between failures, causes and effects can be used to populate conditional relationships between process faults and sensor signal features in a monitoring system.
    Źródło:
    Journal of Machine Engineering; 2011, 11, 4; 118-129
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On use of acoustic emission in monitoring of under and over abrasion during a water jet milling process
    Autorzy:
    Mikler, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/100049.pdf
    Data publikacji:
    2014
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    water jet abrasive milling
    acoustic emission
    signal analysis
    water jet abrasive process control
    Opis:
    Water jet milling process is a new emerging technology with many interesting applications. Low cutting forces, no thermal distortion, process flexibility and ability to machine difficult to cut materials make it very attractive for many technological operations. However, its wider application is hindered by lack of proper solutions of process monitoring that would allow accurate control of the material removal process. The research contributions so far focused on use of acoustic emission, thus the purpose of this paper is an evaluation of the proposed strategies and analysis of applicability of acoustic emission for this purpose. An extensive amount of AE data was collected during waterjet machining with various feed rates, abrasive flows, and pump pressures, and analyzed with the aim to determine whether there exists any feature of the AE signal correlated with under- and over abrasion. Monitoring and control of removal rate is possible only if it is possible to discriminate between AE signal samples originating from different states of the abrasive process. In this paper I present results based on extensive one-way ANOVA study of the AE samples, showing, that the standard AE signal features proposed in the literature the energy and statistics of the AE signal do not allow such discrimination, and are not suitable to monitor abnormalities of the abrasive process. The research covers also principle component analysis of the AE signal energy performed in the aim to study if there exists any subset of the energy allowing better discrimination between the investigated process states.
    Źródło:
    Journal of Machine Engineering; 2014, 14, 2; 104-115
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of water potential on the failure of potato tissue
    Autorzy:
    Haman, J.
    Konstankiewicz, K.
    Zdunek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/25420.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    failure
    production process
    water potential
    acoustic emission
    mechanical parameter
    quality
    potato
    tissue
    plant material
    Źródło:
    International Agrophysics; 2000, 14, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of process parameters on grinding forces and acoustic emission in machining tool steel 1.2201/NC10
    Autorzy:
    Sutowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/95245.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    grinding process
    acoustic emission
    grinding force
    effective value
    szlifowanie
    emisja akustyczna
    siła szlifowania
    wartość skuteczna
    Opis:
    The article presents the association of the output signals of the grinding process with the machining parameters. The article focuses on assessing the suitability of grinding force signal and acoustic signal acquisition for different process conditions. In the first part of the article the kinematic contact of abrasive grain with the workpiece analysis was carried out. By analogy to the micro-cutting process, geometric analyses are presented and the process parameters that have a major impact on the grinding zone load are indicated. Analytically it has been shown that elementary grinding speeds (wheel and workpiece speed) and grinding depth have a significant effect on recorded signal values. The work also presents a set of factors and phenomena that are sources of acoustic emission impulses in the grinding process. For a selected range of grinding parameters, an experimental verification was performed. The article presents the highly correlated relationship between grain penetration depth (maximum uncut chip thickness) and grinding force components, as well as the effective value of acoustic emission. The output signals of the grinding process were also compared, indicating the advantage of the acoustic emission signal above the grinding force in terms of the reaction speed (and lag) of the sensors to the phenomena occurring in the grinding zone.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2017, 1, 1; 37-44
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the microcracking process with the Acoustic Emission method with respect to the service life of reinforced concrete structures with the example of the RC beams
    Autorzy:
    Goszczyńska, B.
    Świt, G.
    Trąmpczyński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/202121.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    service life
    destructive process
    acoustic emission
    3D scanner Aramis
    żywotność
    proces destrukcyjny
    emisja akustyczna
    skaner 3D Aramis
    Opis:
    The study presents the analysis of the process of crack formation and crack width growth in statically determinate and hyperstatic reinforced concrete beams with the IADP acoustic emission method. The beams were subjected to the monotonic, variable with unloading, and variable cyclic loading schemes. The criteria of structural damage were established to account for the structure durability.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 55-63
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The acoustic emission (AE) controlling method of the electric sheet blanking process – a comparative study of selected data mining methods
    Autorzy:
    Kochański, Andrzej
    Czyżewski, Piotr
    Moszczyński, Leszek
    Powiązania:
    https://bibliotekanauki.pl/articles/29520061.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    acoustic emission
    data acquisition
    data preparation method
    visualization method
    process duration
    process speed
    punching
    manufacturing
    Andrews curves
    PCA
    LDA
    tSNE
    Sammon Mapping
    emisja akustyczna
    pozyskiwanie danych
    metoda wizualizacji
    czas trwania procesu
    szybkość procesu
    uderzenie
    produkcja
    krzywe Andrewsa
    mapowanie Sammona
    Opis:
    The article presents an experimental stand to assess the state of punch in the process of sheet blanking. Blanking trials were carried out on an eccentric press. During all the trials, there were recorded signals of acoustic emission (AE) that accompanied the process of blanking. For the recorded AE signals, the methodology of data preparation and analysis was presented. On that basis, the results of the assessment of the state of the punch were presented, and they employed five methods of visualization: Andrews curves, Principal Components Analysis, Linear Discriminant Analysis, a modified method of Stochastic Neighbor Embedding and Sammon Mapping. The aim of the work was to assess the possibility of using visualization methods to predict the condition of the tool on the basis of acoustic emission signals in processes carried out in extremely short times.
    Źródło:
    Computer Methods in Materials Science; 2022, 22, 4; 189-200
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda oceny zgodności zmian zachodzących między sygnałami wyjściowymi w analizie wyników badań eksperymentalnych
    A method for assessing compatibility changes between output signals in analysis of investigation results
    Autorzy:
    Sutowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/156938.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    korelacja
    ocena
    zgodność
    sygnał
    wielkość wyjściowa
    zależność statystyczna zmiennych losowych
    proces szlifowania
    emisja akustyczna
    correlation
    evaluation
    compatibility
    output signals
    statistical dependence of random variables
    grinding process
    acoustic emission
    Opis:
    W pracy przedstawiono propozycję strategii postępowania w trakcie oceny zgodności zmian jakie zachodzą między dwoma dowolnymi sygnałami lub parametrami, mierzalnymi na wyjściu badanego procesu. Zaproponowana idea stanowi alternatywę dla tradycyjnie stosowanej metody statystycznej, opartej na wyznaczeniu związków korelacyjnych. Warunkiem poprawnego zastosowania proponowanej oceny zgodności jest rejestracja wartości sygnałów w sposób chronologiczny i synchroniczny. Metodę tą dotychczas użyto do analizy związków zachodzących między wielkościami wyjściowymi w procesie szlifowania, dowodząc jej efektywności, przy okazji ujawniając istotne cechy współwystępujących zjawisk w strefie szlifowania.
    The paper proposes a strategy for analysis procedure during the conformity assessment of changes that occur between two signals or parameters measured at the investigated process output. The presented idea is an alternative to the traditional statistical method based on determining the correlation. The condition for correct application of the proposed assessment of compliance is recording the signals in a chronological and synchronous way. The method is based on determining the degree of similarity between the elementary lines creating a full course of the compared signals. For each line linking adjacent measurement points there is determined the slope angle and direction in relation to the axis. The similarity rate between any two signals is built based on weight assessment. The conventional methods for determining approximations can give a large error for estimated approximations (understate result) in case of repeated changes of direction of the parameter values in time domain. Such changes cause the accumulation of points in groups on the regression plot. The developed method introduces a strategy to consider this type of behavior. It can be expected that this method can be successfully used to describe correlations between the output signals parameters. It seems to be more appropriate than estimation of the correlation coefficient for non cause-effect relationships. This method was used for analysis of the relationships between the output signal values in the grinding process. Its effectiveness was proved and the important features of co-existing phenomena in the grinding zone were shown .
    Źródło:
    Pomiary Automatyka Kontrola; 2010, R. 56, nr 5, 5; 471-474
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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