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    Wyświetlanie 1-14 z 14
    Tytuł:
    Image velocimetry and statistical analysis of a mesh-coupled axial blade distributor for mass transfer in a swirling bed
    Autorzy:
    Javed, Muhammad Asif
    Shukrullah, Shazia
    Naz, Muhammad Yasin
    Sarfraz, Raja Adil
    Powiązania:
    https://bibliotekanauki.pl/articles/2055043.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    mesh-coupled distributor
    blade inclination angle
    particle image velocimetry
    response surface analysis
    Opis:
    A mesh-coupled axial blade distributor was tested for fluidization of particles in a swirling fluidized bed. The bed velocity was estimated experimentally using a high-speed imaging device and MATLAB supported particle image velocimetry (PIV). The bed velocity was also predicted statistically with a response surface analysis method. During statistical analysis, the confidence interval of bed velocity remained between 0.49485 and 0.49998. The bed velocity was measured about 0.49741m/s and 0.538m/s through experimental and statistical methods, respectively. The experimental and statistical analysis revealed similar bed weights and superficial velocities with a slight difference of 6.4◦ in blade angles.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2020, 58, 3; 779--790
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    How empathy and social entrepreneurial self-efficacy interact to affect social entrepreneurial intention: A polynomial regression with response surface analysis
    Autorzy:
    Le, Thi Loan
    Pham, Huong Thao
    Nguyen, Ngoc Duong
    Powiązania:
    https://bibliotekanauki.pl/articles/39829996.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    social social entrepreneurial intention
    empathy
    social entrepreneurial self-efficacy
    polynomial regression
    response surface analysis
    Opis:
    Research background: Previous studies have argued that empathy (EMP) is an important factor that enhances individuals’ intention to engage in social business. However, the effect of this factor on social entrepreneurial intention (SEI) is unclear (Ukil et al., 2023). Also, although numerous studies have explored the individual impacts of EMP and social entrepreneurial self-efficacy (SES) on SEI, there is a notable scarcity of research that delves into the combined influence of these two predictor variables on the intention to engage in social business. Purpose of the article: This study proposes that EMP does not only individually affect, but also interacts with other factors to influence the intention to start a social business. Therefore, this study aims to investigate how EMP and SES interact to promote SEI. Methods: Based on a survey dataset of 409 respondents in Vietnam, this study employed polynomial regression with response surface analysis to examine the complementary, balance, and imbalance effects of EMP and SES on SEI. Findings & value added: This study's results suggest complementary effects between EMP and SES on SEI. Specifically, this study finds that when EMP and SES are balanced at higher levels, SEI is higher, and when their imbalance increases in either direction, SEI is lower. In addition, this study finds that the degree of SEI is higher when individuals have high SES with low EMP compared to the other way round. The findings of this study enhance our understanding of the complexity of motivation and how it affects SEIs, revealing the complex interaction between EMP and SES in shaping these intentions within a multidimensional motivational framework.
    Źródło:
    Oeconomia Copernicana; 2023, 14, 4; 1341-1366
    2083-1277
    Pojawia się w:
    Oeconomia Copernicana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Self-Related Factors Explaining Double Standards in Assessing Emotional Costs of Victims Suffering from Severe and Trifling Offenses
    Czynniki związane z Ja wyjaśniające „podwójne standardy” w zakresie szacowania emocjonalnych kosztów osób będących ofiarami poważnych i drobnych wykroczeń
    Autorzy:
    Dubas-Miciuk, Monika Maria
    Miciuk, Łukasz Roland
    Powiązania:
    https://bibliotekanauki.pl/articles/34111946.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    hostility
    victim
    self-enhancement
    self-esteem
    response surface analysis
    wrogość
    ofiara
    autowaloryzacja
    samoocena
    analiza powierzchni odpowiedzi
    Opis:
    The role of emotions in moral behaviors is emphasized by many neuroscientists and philosophers. From psychological point of view, solving moral dilemmas is impossible in isolation from cognitive-emotional processes related to the self. This study aimed to test self-related factors explaining discrepancies in the judgement of hostility and sadness experienced by someone else’s victim and the judge’s own victim, suffering from severe and trifling offences. The research was conducted in both experimental and correlational paradigms, with response surface analysis (RSA) as a key method of data analysis. Total number of participants was 171. The following questionnaires were used: The Self-Motive Items (SMI), Self-Esteem Scale (SES), Ten Items Personality Inventory (TIPI-PL) and The Positive and Negative Affect Schedule – Expanded Form. According to the results, self-esteem is a predictor of (in)congruence of the levels of hostility attributed to victims suffering from severe offenses, while the motives of self-enhancement and self-assessment predict particular patterns of (mis)matches in the levels of hostility attributed to victims suffering from trifling offenses. Discussion of the findings deals, inter alia, with the role of self-perspective in effective recognition of other people's emotional states.
    Rola emocji w ludzkiej moralności jest podkreślana przez wielu neuronaukowców i filozofów. Z psychologicznego punktu widzenia rozwiązywanie dylematów moralnych jest niemożliwe w oderwaniu od procesów poznawczo-emocjonalnych związanych z Ja. Niniejsze badanie miało na celu przetestowanie czynników związanych z Ja, potencjalnie wyjaśniających rozbieżności w zakresie szacowanych poziomów wrogości i smutku doświadczanych przez ofiary poważnych przestępstw i drobnych wykroczeń, w których wyobrażonym sprawcą była osoba dokonująca szacowania lub jakaś inna osoba. Badanie przeprowadzono w paradygmatach eksperymentalnym i korelacyjnym, przy czym kluczową metodą analizy danych była analiza powierzchni odpowiedzi (RSA). Przebadano 171 osób za pomocą takich kwestionariuszy, jak: Skala Motywów Autoewaluacyjnych (SMA), Skala Samooceny Rosenberga (SES), Polska Adaptacja testu Ten Items Personality Inventory (TIPIPL) oraz Skala Pozytywnego i Negatywnego Afektu – Wersja Rozszerzona (PANAS-X). Okazało się, że samoocena była predyktorem (nie)zgodności poziomów wrogości przypisywanych ofiarom poważnych przestępstw, podczas gdy motywy autowaloryzacji i samopoznania przewidywały określone wzorce (ro)zbieżności poziomów wrogości przypisywanych ofiarom drobnych wykroczeń. Dyskusja wyników dotyczy m.in. znaczenia perspektywy Ja dla skutecznego rozpoznawania stanów emocjonalnych innych ludzi.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska, sectio J – Paedagogia-Psychologia; 2020, 33, 3; 105-122
    0867-2040
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska, sectio J – Paedagogia-Psychologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Response Surface Analysis of the Compressive Strength of Self-Compacting Concrete Incorporating Metakaolin
    Autorzy:
    Busari, Ayobami
    Dahunsi, Bamidel
    Akinmusuru, Joseph
    Loto, Tolulope
    Ajayi, Samuel
    Powiązania:
    https://bibliotekanauki.pl/articles/102799.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    response surface analysis
    metakaolin
    self-compacting concrete
    sustainable infrastructure
    analiza powierzchni reakcji
    beton samozagęszczalny
    zrównoważona infrastruktura
    Opis:
    This research developed a mathematical model and optimization of materials for the development of metakaolin self-compacting concrete. This is in a bid to reduce the overall material quantity and cost towards sustainable infrastructural construction. To achieve the aim of this research, Response Surface Analysis (RSM) was used. Kaolinitic clay was De-hydroxylated at 750°C to form metakaolin. This was used as a partial replacement for cement at 0%, 5%, 10%, 15%, 20% and 25% weight of Portland limestone cement. Both strength and rheology properties of the developed metakaolin self-compacting concrete were assessed. To this end, slump flow, L-Box test and V-funnel test were carried out alongside the compressive strength using relevant standard. The result of the research revealed that at 15% addition of metakaolin the slump flow, passing ability and filling ability was unsatisfactory according to EFNARC standard. From the numerical optimization of the compressive strength, the maximum predicted compressive strength of 44.35 N/mm2 was obtained. At a low value of metakaolin addition (5–15%), the compressive strength increased as the age of the concrete increased from 3–150 days. The age with the optimum mechanical strength formation was 110 days with metakaolin addition of 52.73 kg. The result of this research provide a database for Engineers, Researchers and Construction workers on the optimum metakaolin required to achieve satisfactory mechanical strength in metakaolin self-compacting concrete.
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 2; 7-13
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    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:
    Ryszard Zieliński’s contribution to statistical optimization and fixed-precision estimation
    Autorzy:
    Męczarski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/747417.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    stochastic approximation, Kiefer-Wolfowitz procedure, gradient estimation, response surface analysis, simplex design, confidence set, stopping rule, fixed-precision estimation
    aproksymacja stochastyczna, procedura Kiefera\--Wol\-fowitza, estymacja gradientu, analiza powierzchni odpowiedzi, plan sympleksowy, zbiór ufności, reguła zatrzymania, estymacja stałoprecyzyjna
    Opis:
    W tej części opisane będą wyniki Profesora Ryszarda Zielińskiego w dziedzinie klasycznej aproksymacji stochastycznej, analizy powierzchni odpowiedzi oraz konstrukcji zbiorów ufności o zadanej precyzji.
    Professor Ryszard Zieliński's results in stochastic approximation, extremal experimental design in the framework of response surface analysis and fixed-precision set estimation are outlined. First, he proposed a randomized version of Fabian's (1967) gradient estimate in the Kiefer-Wolfowitz procedure, which reduced the number of required observations and improved the rate of convergence. Second, when considering response surface analysis and experimental designs for the gradient estimation, he constructed a randomized simplex design which resulted in the unbiased estimator. Third, he gave a method to construct confidence sets with prescribed accuracy (i. e. the width and the confidence level) by sampling independent copies of a process of interest. Professor Ryszard Zieliński's results in stochastic approximation, extremal experimental design in the framework of response surface analysis and fixed precision set estimation are outlined. First, he proposed a randomized version of Fabian's (1967) gradient estimate in the Kiefer-Wolfowitz procedure, which reduced the number of required observations and improved the rate of convergence. Second, when considering response surface analysis and experimental designs for the gradient estimation, he constructed a randomized simplex design which resulted in the unbiased estimator. Third, he gave a method to construct confidence sets with prescribedaccuracy (i. e. the width and the confidence level) by sampling independent copiesof a process of interest.
    Źródło:
    Mathematica Applicanda; 2012, 40, 2
    1730-2668
    2299-4009
    Pojawia się w:
    Mathematica Applicanda
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Case study about economic order quantities and comparison of results from conventional EOQ model and response surface-based approach
    Autorzy:
    Yıldız, R.
    Yaman, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/406756.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    economic order quantity
    Pareto analysis
    response surface
    demand forecasting
    Opis:
    This study involves the implementation of an economic order quantity (EOQ) model which is an inventory control method in a ceramic factory. Two different methods were applied for the calculation of EOQs. The first method is to determine EOQ values using a response surface method-based approach (RSM). The second method uses conventional EOQ calculations. To produce a ceramic product, 281 different and additive materials may be used. First, Pareto (ABC) analysis was performed to determine which of the materials have higher priority. Because of this analysis, the value of 21 items among 281 different materials and additives were compared to the ratio of the total product. The ratio was found to be 70.4% so calculations were made for 21 items. Usage value for every single item for the years 2011, 2012, 2013 and 2014, respectively, were obtained from the company records. Eight different demand forecasting methods were applied to find the amount of the demand in EOQ. As a result of forecasting, the EOQ of the items were calculated by establishing a model. Also, EOQ and RSM calculations for the items were made and both calculation results were compared to each other. Considering the obtained results, it is understood that RSM can be used in EOQ calculations rather than the conventional EOQ model. Also, there are big differences between the EOQ values which were implemented by the company and the values calculated. Because of this work, the RSM-based EOQ approach can be used to decide on the EOQ calculations as a way of improving the system performance.
    Źródło:
    Management and Production Engineering Review; 2018, 9, 3; 23-32
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of multibody simulation for semitrailer optimization
    Autorzy:
    Korta, J.
    Martowicz, A.
    Gallina, A.
    Uhl, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/247963.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    multibody dynamic system
    response surface
    design of experiment
    sensitivity analysis
    Opis:
    This paper presents an approach of optimization of a truck semitrailer suspension system, with utilization of multibody model; its purpose was to find the best values of operational parameters: stiffness and damping factors, in order to minimize the disadvantageous influence of force distribution in the high risk areas, where preceding strength analysis has pointed out dangerous load values. The model contains elements of two different types: flexible and rigid bodies, in purpose of increasing the accuracy level of conducted numerical calculations. A number of simulations with different parameters and under different load cases have been carried out, combined with a parametric and structural sensitivity analysis, what has enabled an estimation of individual factors influencing particular forces that have been the objectives of optimization procedure. The stiffness and damping coefficients of the construction suspension system have been adjusted by applying metamodeling techniques. Basing on the chosen design of experiment results, this procedure allows for an approximation of the behaviour of the analysed construction in the whole design space. In this process, two different approaches have been used: Kriging and polynomial regression, and both have been compared to the simulations results. Finally, using a desirability function, the most optimal solution has been found.
    Źródło:
    Journal of KONES; 2012, 19, 1; 171-182
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    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:
    Numerical modelling of structures with uncertainties
    Autorzy:
    Kahsin, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/260542.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    wind turbine
    offshore
    FEA
    modal analysis
    dynamic coupling
    sensitivity analysis
    design of experiment
    response surface method
    Opis:
    The nature of environmental interactions, as well as large dimensions and complex structure of marine offshore objects, make designing, building and operation of these objects a great challenge. This is the reason why a vast majority of investment cases of this type include structural analysis, performed using scaled laboratory models and complemented by extended computer simulations. The present paper focuses on FEM modelling of the offshore wind turbine supporting structure. Then problem is studied using the modal analysis, sensitivity analysis, as well as the design of experiment (DOE) and response surface model (RSM) methods. The results of modal analysis based simulations were used for assessing the quality of the FEM model against the data measured during the experimental modal analysis of the scaled laboratory model for different support conditions. The sensitivity analysis, in turn, has provided opportunities for assessing the effect of individual FEM model parameters on the dynamic response of the examined supporting structure. The DOE and RSM methods allowed to determine the effect of model parameter changes on the supporting structure response.
    Źródło:
    Polish Maritime Research; 2017, S 1; 125-132
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling and optimization of temperature in orthopaedic drilling : An in vitro study
    Autorzy:
    Pandey, R. K.
    Panda, S. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/307028.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    analysis of variance
    ANOVA
    orthopaedic surgery
    response surface methodology
    Taguchi method
    thermal osteonecrosis
    analiza wariancji
    chirurgia ortopedyczna
    metoda Taguchi
    Opis:
    This present investigation uses the Taguchi and response surface methodology (RSM) for modelling and optimization of the temperature produced during bone drilling. The drilling of bone is a common procedure in orthopaedic surgery to produce hole for screw insertion to fixate the fracture devices and implants. A major problem which is encountered during such a procedure is the increase in temperature of the bone due to the plastic deformation of chips and the friction between the bone and the drill. The increase in temperature can result in thermal osteonecrosis which may delay healing or reduce the stability and strength of the fixation. The drilling experiments are conducted on poly-methyl-meth-acrylate (PMMA) (as a substitute for bone) using Taguchi’s L27 experimental design technique. The cutting parameters used are drill diameter, feed rate and cutting speed. The optimum cutting parameters for minimum temperature are determined by using S/N ratios and the effect of individual cutting parameters on temperature produced is evaluated using analysis of variance (ANOVA). A second-order model is established between the drilling parameters and temperature using RSM. The experimental results show that the drill diameter is the most significant drilling parameter affecting the temperature during drilling followed by cutting speed and feed, respectively. The values predicted and the values obtained from experiment are fairly close, which indicates that the developed RSM model can be effectively used to predict the temperature in orthopaedic drilling.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2014, 16, 1; 107-116
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy absorption characteristics of thin-walled sinusoidal corrugated tube using RSM-CCD
    Autorzy:
    Rahim, Mohd. Reyaz Ur
    Bharti, Prem Kumar
    Powiązania:
    https://bibliotekanauki.pl/articles/1839500.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    response surface method
    RSM
    corrugated tube
    energy absorption characteristics
    finite element analysis
    thin-walled structure maximum
    metoda powierzchni odpowiedzi
    rura falista
    charakterystyka pochłaniania energii
    analiza elementów skończonych
    konstrukcja cienkościenna
    Opis:
    The axial crushing behaviour of tubes of different section shapes has been extensively investigated as they have an excellent energy absorption, but the thin walled corrugated tube structures have been designed to further improve their energy absorption performance. The study aims to analyze the effect of sinusoidal corrugations along cross section of the tube on peak force, energy absorption and specific energy absorption. In the present work the response surface methodology (RSM) using central composite design (CCD) has been used and simulation work is performed by using ANSYS workbench to explore the effects of geometrical parameters on the responses of constructing models.
    Źródło:
    Production Engineering Archives; 2020, 26, 4; 144-153
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Immunoblot analysis of immune response to cell surface antigens of different Helicobacter pylori strains
    Autorzy:
    Karczewska, E
    Wyle, F.
    Tarnawski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/70270.pdf
    Data publikacji:
    1996
    Wydawca:
    Polskie Towarzystwo Fizjologiczne
    Tematy:
    Western blot zob.immunoblot
    gastric ulcer
    protease
    lipase
    duodenal ulcer
    Helicobacter pylori
    gastric carcinoma
    immunoblot analysis
    peptic ulcer
    cell surface
    antigen
    Western blotting zob.immunoblotting
    ammonia
    cytotoxin
    rabbit serum
    immune response
    Źródło:
    Journal of Physiology and Pharmacology; 1996, 47, 1
    0867-5910
    Pojawia się w:
    Journal of Physiology and Pharmacology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving the procedure of probabilistic load testing design of typical bridges based on structural response similarities
    Wzbogacenie procedury probabilistycznego projektowania próbnego obciążenia mostów typowych na podstawie cech wspólnych mechanicznej odpowiedzi konstrukcji
    Autorzy:
    Owerko, P.
    Winkelmann, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1849805.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    obciążenie próbne
    most
    imperfekcja
    niepewność
    analiza wrażliwości
    analiza probabilistyczna
    metoda powierzchni odpowiedzi
    symulacja Monte Carlo
    metoda elementów skończonych
    MES
    projektowanie eksperymentu
    bridge
    in-situ test
    load testing
    imperfection
    uncertainty
    sensitivity analysis
    probability analysis
    response surface method
    Monte Carlo simulation
    finite element model
    FEM
    experiment design
    Opis:
    This paper concerns load testing of typical bridge structures performed prior to operation. In-situ tests of a two-span post-tensioned bridge loaded with three vehicles of 38-ton mass each formed the input of this study. On the basis of the results of these measurements an advanced FEM model of the structure was developed for which the sensitivity analysis was performed for chosen uncertainty sources. Three uncorrelated random variables representing material uncertainties, imperfections of positioning and total mass of loading vehicles were indicated. Afterwards, two alternative FE models were created based on a fully parametrised geometry of the bridge, differing by a chosen global parameter – the skew angle of the structure. All three solid models were subjected to probabilistic analyses with the use of second-order Response Surface Method in order to define the features of structural response of the models. It was observed that both the ranges of expected deflections and their corresponding mean values decreased with an increase of the skewness of the bridge models. Meanwhile, the coefficient of variation and relative difference between the mean value and boundary quantiles of the ranges remain insensitive to the changes in the skew angle. Owing to this, a procedure was formulated to simplify the process of load testing design of typical bridges differing by a chosen global parameter. The procedure allows - if certain conditions are fulfilled - to perform probabilistic calculations only once and use the indicated probabilistic parameters in the design of other bridges for which calculations can be performed deterministically.
    Pracę otwiera przegląd najnowszej literatury fachowej o zasięgu międzynarodowym, dotyczącej próbnych obciążeń obiektów mostowych. W licznych publikacjach badawczych jednoznacznie stwierdzono, iż zasadne jest, by często stosowane w tym zakresie metody deterministyczne uzupełniać lub zastępować analizami probabilistycznymi. Niniejsza praca stanowi zatem rozwinięcie dotychczasowych osiągnięć i spostrzeżeń. Przedmiotem pracy jest analiza możliwości zwiększenia efektywności procesu przygotowania probabilistycznych projektów próbnych obciążeń typowych konstrukcji mostowych, różniących się wybranym parametrem geometrycznym (w tym przypadku – kątem ukosu konstrukcji „α”) przed ich dopuszczeniem do eksploatacji w zakresie pomiarów statycznych. Punktem wyjściowym przedstawionej analizy jest próbne obciążenie in-situ typowego, drogowego mostu sprężonego. Jednym z podstawowych kryteriów dopuszczenia obiektu mostowego do użytkowania w niektórych krajach, jest wykazanie, iż ugięcia dźwigarów głównych obiektu mostowego wywołane statycznym obciążeniem próbnym są mniejsze niż te określone teoretycznie w modelu MES obiektu. W pierwszej kolejności zatem, wyniki pochodzące z rzeczywistych badań próbnego obciążenia zostały zestawione z ich teoretycznymi odpowiednikami, pochodzącymi z prostego modelu rusztowego mostu. Ten przykład ogranicza się do analizy maksymalnych ugięć jednego z dźwigarów głównych obiektu. Wykazano, iż ugięcia z pomiarów in-situ (pomierzone przemieszczenia zostały odpowiednio przeliczone na ugięcia, aby uwzględnić wpływ osiadania podpór i zgniotów łożysk) były mniejsze niż te określone teoretycznie. Nie było zatem podstaw do niedopuszczenia mostu do użytkowania ze względu na niespełnienie kryterium ugięć. Jednakże, w rezultacie analizy wykazano, iż wyniki odpowiedzi konstrukcji z prostego modelu deterministycznego różniły się znacznie od wyników pomiarów. W związku z tym, w celu opracowania procedury zwiększenia efektywności procesu przygotowywania probabilistycznych projektów próbnych obciążeń obiektów typowych, do dalszych analiz porównawczych i probabilistycznych wygenerowany został znacząco bardziej zaawansowany model bryłowy MES.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 4; 325-342
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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