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    Wyświetlanie 1-12 z 12
    Tytuł:
    Estimation of the Effect of Production Parameters on Mechanical Properties of Sintered Steels Using ANOVA
    Autorzy:
    Sułowski, M.
    Jordan, A.
    Czarski, A.
    Matusiewicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/356320.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    powder metallurgy
    analysis of variance (ANOVA)
    Opis:
    The object of the study was to assess the influence of selected production parameters of sintered Fe-Mn-Cr-Mo-C steels i.e. chemical composition, sintering temperature, sintering atmosphere and heat treatment on the following mechanical properties: impact toughness, hardness of the surface, tensile strength, bend strength after static tensile tests. In the investigations, the general linear model (GLM) of the multivariate analysis of variance ANOVA was used. All assumptions of ANOVA, i.e. randomization of the experiment, the normality of the residuals, equality of variance at different levels have been fulfilled and verified. The predictive strength of the constructed models expressed by the adjusted determination coefficient (R2adj) is at medium or large level – R2adj is in the range from 41.46% to 76.97%. This work is focused mainly on the ANOVA methodology. A wide physical interpretation of the results will be possible after the optimization of the ANOVA models used.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 571-576
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical Assessment of the Impact of Elevated Contents of Cu and Ni on the Properties of Austempered Ductile Iron
    Autorzy:
    Nawrocki, P.
    Kochański, A.
    Myszka, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/352744.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    austempered ductile iron
    statistical analysis
    analysis of variance (ANOVA)
    Grubbs Test
    Statistica
    Opis:
    The article presents a statistical analysis of data collected from the observation of the production of austempered ductile iron. The impact assessment of the chemical composition, i.e. high contents of Cu and Ni on the properties of ductile iron isothermal tempered is critical to find the right chemical composition of austempered ductile iron. Based on the analyses range of the percentage of Cu and Ni which were selected in the cast iron to obtain material with high strength properties.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 2147-2150
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of Cr3C2-25% NiCr Laser Alloyed Cast Iron in High Temperature Sliding Wear Condition Using Response Surface Methodology
    Autorzy:
    Jeyaprakash, N.
    Duraiselvam, M.
    Raju, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/351074.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Laser Surface Alloying
    LSA
    wear
    microhardness
    Analysis of Variance
    ANOVA
    Response Surface Methodology
    RSM
    Opis:
    The wear behaviour of Cr3C2-25% NiCrlaser alloyed nodular cast iron sample were analyzed using a pin-on-disc tribometer. The influence of sliding velocity, temperature and load on laser alloyed sample was focused and the microscopic images were used for metallurgical examination of the worn-out sites. Box-Behnken method was utilised to generate the mathematical model for the condition parameters. The Response Surface Methodology (RSM) based models are varied to analyse the process parameters interaction effects. Analysis of variance was used to analyse the developed model and the results showed that the laser alloyed sample leads to a minimum wear rate (0.6079 ×10–3 to 1.8570 ×10–3 mm3/m) and coefficient of friction (CoF) (0.43 to 0.53). From the test results, it was observed that the experimental results correlated well with the predicted results of the developed mathematical model.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1303-1315
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of information on sleep apnoea contained in two symmetric EEG recordings
    Autorzy:
    Prucnal, Monika A.
    Polak, Adam G.
    Powiązania:
    https://bibliotekanauki.pl/articles/220736.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sleep apnoea detection
    EEG signal
    discrete wavelet transforms
    Hilbert transforms
    analysis of variance
    multivariate regression analysis
    Opis:
    Electroencephalogram (EEG) is one of biomedical signals measured during all-night polysomnography to diagnose sleep disorders, including sleep apnoea. Usually two central EEG channels (C3-A2 and C4-A1) are recorded, but typically only one of them are used. The purpose of this work was to compare discriminative features characterizing normal breathing, as well as obstructive and central sleep apneas derived from these central EEG channels. The same methodology of feature extraction and selection was applied separately for the both synchronous signals. The features were extracted by combined discrete wavelet and Hilbert transforms. Afterwards, the statistical indexes were calculated and the features were selected using the analysis of variance and multivariate regression. According to the obtained results, there is a partial difference in information contained in the EEG signals carried by C3-A2 and C4-A1 EEG channels, so data from the both channels should be preferably used together for automatic sleep apnoea detection and differentiation.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 2; 229-239
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of process parameters of friction stir welded AA 5083-O aluminum alloy using Response Surface Methodology
    Autorzy:
    Jannet, S.
    Mathews, P. K.
    Raja, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/202208.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir welding
    optimization
    Response Surface Analysis
    Analysis of Variance
    tensile strength
    spawanie
    tarcie
    optymalizacja
    RSA
    wytrzymałość na rozciąganie
    Opis:
    A methodology was exhibited to create the experimental model for assessing the Ultimate Tensile Strength of AA 5083-O aluminum compound which is broadly utilized as a part of boat building industry by Friction Stir Welding (FSW). FSW process parameters, such as: tool rotational speed, welding speed, and axial force were optimized for better results. FSW was completed considering three-component 3-level Box Behnekn Design. Response surface Methodology (RSM) was implemented to obtain the relationship between the FSW process parameters and ultimate Tensile Strength. Analysis of Variance (ANOVA) procedure was utilized to check the aptness of the created model. The FSW process parameters were additionally streamlined utilizing Response Surface Methodology (RSM) to augment tensile strength. The joint welded at a rotational speed of 1100 rpm, a welding speed of 75 mm/min and a pivotal energy of 2.5 t displays higher tensile strength compared with different joints in comparison with other joints.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 4; 851-855
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric Sensitivity Analysis of Factors Affecting Sound Transmission Loss of Multi-Layered Building Elements Using Taguchi Method
    Autorzy:
    Garg, N.
    Kumar, A.
    Maji, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/178151.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spectrum adaptation terms
    weighted sound reduction index
    orthogonal array
    OA
    analysis of variance
    ANOVA
    mass-air-mass resonance
    Opis:
    The paper presents application of Taguchi method in optimizing the sound transmission loss through sandwich gypsum constructions and those comprising of masonry concrete blocks and gypsum boards in order to investigate the relative influence of the various parameters affecting the sound transmission loss. The application of Taguchi method for optimizing sound transmission loss has been rarely reported. The present work uses the results analytically predicted on “Insul” software for various sandwich material configurations as desired by each experimental run in an L8 orthogonal array. The relative importance of the parameters on single-number rating, Rw (C, Ctr) is evaluated in terms of percentage contribu- tion using Analysis of Variance (ANOVA). The ANOVA method reveals that type of studs, steel stud frame and number of gypsum layers attached are the key factors controlling the sound transmission loss characteristics of sandwich multi-layered constructions.
    Źródło:
    Archives of Acoustics; 2014, 39, 2; 165-176
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid GRA-PCA and modified weighted TOPSIS coupled with Taguchi for multi-response process parameter optimization in turning AISI 1040 steel
    Autorzy:
    Mst. Nazma, Sultana
    Nikhil Ranjan, Dhar
    Powiązania:
    https://bibliotekanauki.pl/articles/1845051.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    grey relational analysis
    principal component analysis
    Taguchi method
    analysis of variance
    cryogenic cooling
    szara analiza relacyjna
    analiza głównych składowych
    metoda Taguchi
    analiza wariancji
    chłodzenie kriogeniczne
    Opis:
    The objective of the present study is to optimize multiple process parameters in turning for achieving minimum chip-tool interface temperature, surface roughness and specific cutting energy by using numerical models. The proposed optimization models are offline conventional methods, namely hybrid Taguchi-GRA-PCA and Taguchi integrated modified weighted TOPSIS. For evaluating the effects of input process parameters both models use ANOVA as a supplementary tool. Moreover, simple linear regression analysis has been performed for establishing mathematical relationship between input factors and responses. A total of eighteen experiments have been conducted in dry and cryogenic cooling conditions based on Taguchi L18 orthogonal array. The optimization results achieved by hybrid Taguchi-GRA-PCA and modified weighted TOPSIS manifest that turning at a cutting speed of 144 m/min and a feed rate of 0.16 mm/rev in cryogenic cooling condition optimizes the multi-responses concurrently. The prediction accuracy of the modified weighted TOPSIS method is found better than hybrid Taguchi-GRA-PCA using regression analysis.
    Źródło:
    Archive of Mechanical Engineering; 2021, LVIII, 1; 23-49
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of accuracy of digital map data via multiple comparisons
    Autorzy:
    Doskocz, A.
    Rejchel, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/200530.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital map data
    evaluation of positional accuracy
    analysis of variance
    ANOVA
    multiple comparisons
    rank-based methods
    dane map cyfrowych
    ocena dokładności pozycjonowania
    analiza wariancji
    wielokrotne porównania
    Opis:
    Digital map data sets (or geo-databases) are an important part of the spatial data infrastructure (SDI) of the European Community. Different methods of producing large-scale map data are described in the paper, and the aim is to compare the accuracy of these methods. Our analysis is based on statistical tools belonging to the multiple comparisons theory. The first method is the well-known analysis of variance (ANOVA), and the second one is the rank-based method. The latter approach, which is rarely used in geodetic research, allows us to determine the order of the considered methods with respect to the positional accuracy of digital map data that they produce. Using this approach, one can identify the least accurate set of map data or a fragment of a map that should be updated by a new direct survey. The rank-based methods can also be rather easily applied to other technical (engineering) disciplines, e.g. geodesy and cartography.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 799-805
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of a Taguchi-GRA optimized PID and adaptive PID controllers for speed control of DC motor
    Autorzy:
    George, Mary Ann
    Kamat, Dattaguru V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955179.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analysis of variance
    Lyapunov rule
    MIT rule
    model reference adaptive control
    Taguchi-grey relational analysis
    analiza wariancji
    zasada Lyapunowa
    zasada MIT
    adaptacyjna kontrola modelu odniesienia
    analiza relacyjna Taguchi-grey
    Opis:
    DC motors have wide acceptance in industries due to their high efficiency, low costs, and flexibility. The paper presents the unique design concept of a multi-objective optimized proportional-integral-derivative (PID) controller and Model Reference Adaptive Control (MRAC) based controllers for effective speed control of the DC motor system. The study aims to optimize PID parameters for speed control of a DC motor, emphasizing minimizing both settling time (Ts )and % overshoot (% OS) of the closed-loop response. The PID controller is designed using the Ziegler Nichols (ZN) method primarily subjected to Taguchi-grey relational analysis to handle multiple quality characteristics. Here, the Taguchi L9 orthogonal array is defined to find the process parameters that affect Ts and % OS. The analysis of variance shows that the most significant factor affecting Ts and % OS is the derivative gain term. The result also demonstrates that the proposed Taguchi- GRA optimized controller reduces Ts and % OS drastically compared to the ZN-tuned PID controller. This study also uses MRAC schemes using the MIT rule, Lyapunov rule, and a modified MIT rule. The DC motor speed tracking performance is analyzed by varying the adaptation gain and reference signal amplitude. The results also revealed that the proposed MRAC schemes provide desired closed-loop performance in real-time in the presence of disturbance and varying plant parameters. The study provides additional insights into using a modified MIT rule and the Lyapunov rule in protecting the response from signal amplitude dependence and the assurance of a stable adaptive controller, respectively.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 4; 759-775
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reproduction of Phantom Sources Improves with Separation of Direct and Reflected Sounds
    Autorzy:
    Kleczkowski, P.
    Król, A.
    Małecki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/177770.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spatial audio
    multichannel sound reproduction
    phantom sources
    auralization
    ambisonics abbreviations
    IR (impulse response)
    SIR (spatial impulse response)
    RT (reverberation time)
    ANOVA (analysis of variance)
    DS – direct sound
    RSs – reflected sounds
    Opis:
    In virtual acoustics or artificial reverberation, impulse responses can be split so that direct and reflected components of the sound field are reproduced via separate loudspeakers. The authors had investigated the perceptual effect of angular separation of those components in commonly used 5.0 and 7.0 multichannel systems, with one and three sound sources respectively (Kleczkowski et al. (2015b). In that work, each of the front channels of the 7.0 system was fed with only one sound source. In this work a similar experiment is reported, but with phantom sound sources between the front loudspeakers. The perceptual advantage of separation was found to be more consistent than in the condition of discrete sound sources. The results were analysed both for pooled listeners and in three groups, according to experience. The advantage of separation was the highest in the group of experienced listeners.
    Źródło:
    Archives of Acoustics; 2015, 40, 4; 575-584
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study into occurrence of fire in opencast workings over developed coal pillars and evolving control parameters for its safe extraction
    Badanie przypadku wystąpienia pożaru w wyrobiskach odkrywkowych ponad udostępnianymi filarami węglowymi i opracowanie parametrów kontrolnych dla zapewnienia ich bezpiecznego wydobycia
    Autorzy:
    Panigrahi, D.
    Sinha, S. K.
    Singh, G. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/219289.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    prowadzenia odkrywki powyżej filarów podziemnych udostępnionych metodą filarowo-komorową
    parametry krytyczne określające możliwość wystąpienia pożaru
    parametry górnicze
    przegląd krytyczny
    parametry związane z wydobyciem
    przedział ufności
    analiza wariancji
    opencast over underground bord and pillars
    critical to fire
    mining parameters
    critical review
    mine operational parameters
    confidence interval and analysis of variance
    Opis:
    In India, a number of opencast mines are being worked over the coal pillars developed by underground bord and pillar method of mining. In these cases, the fires have occurred in most of these opencast mines causing loss of the coal reserve, production, productivity and safety. In this research work, 13 such mines have been studied over a period of three years and critical parameters for occurrence of these fires have been identified. This paper presents the details of observations for two such mines and detailed statistical analyses have been carried out by using confidence interval (C.I.) and analysis of variance (ANOVA-Two-way classification) for finding out the range of these critical parameters which can be controlled to reduce the occurrence of these fires.
    W wielu kopalniach odkrywkowych w Indiach wydobycie prowadzi się w wyrobiskach ponad filarami ochronnymi udostępnianymi przy wykorzystaniu metody filarowo-komorowej. W takich warunkach powstające często w kopalniach pożary powodują utratę zasobów węglowych, zmniejszenie wydajności i poziomu wydobycia oraz negatywnie wpływają na bezpieczeństwo pracy. W artykule tym przeanalizowano przypadki 13 kopalni odkrywkowych na przestrzeni trzech lat, zidentyfikowano krytyczne parametry dla określenia możliwości wystąpienia pożaru. Artykuł przedstawia dokładne obserwacje poczynione w dwóch kopalniach, poparte szczegółową analizą statystyczną z zastosowaniem przedziałów ufności i analizy wariancji (ANOVA - klasyfikacja dwukierunkowa) do określenia wartości parametrów krytycznych w celu zminimalizowania ryzyka wystąpienia pożarów.
    Źródło:
    Archives of Mining Sciences; 2013, 58, 4; 1145-1162
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical significance of displacements in heterogeneous control networks
    Statystyczna istotność przemieszczeń w niejednorodnych sieciach kontrolnych
    Autorzy:
    Nowel, K.
    Kamiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/145400.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analiza deformacji
    test statystyczny
    sieci kontrolne
    deformation analysis
    statistical test
    confidence ellipse
    estimation of variance components
    Opis:
    This paper proposes a modification of the classical process for evaluating the statistical significance of displacements in the case of heterogeneous (e.g. linear-angular) control networks established to deformation measurements and analysis. The basis for the proposed solution is the idea of local variance factors. The theoretical discussion was complemented with an example of its application on a simulated horizontal control network. The obtained results showed that the evaluation of the statistical significance of displacements in the case of heterogeneous control networks should be carried out using estimators of local variance factors.
    W pracy zaproponowano modyfikację klasycznego procesu oceny statystycznej istotności przemieszczeń w przypadku niejednorodnych sieci kontrolnych (np. kątowo - liniowych) zakładanych do pomiarów i analizy deformacji. Podstawą proponowanego rozwiązania jest idea lokalnych współczynników wariancji. Rozważania teoretyczne uzupełniono przykładem zastosowania na symulowanej poziomej sieci kontrolnej. Uzyskane wyniki pokazały, że ocena statystycznej istotności przemieszczeń w przypadku niejednorodnych sieci kontrolnych powinna być przeprowadzana z użyciem właśnie estymatorów lokalnych współczynników wariancji.
    Źródło:
    Geodesy and Cartography; 2013, 62, 2; 139-156
    2080-6736
    2300-2581
    Pojawia się w:
    Geodesy and Cartography
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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