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    Wyświetlanie 1-8 z 8
    Tytuł:
    Modeling and energy recovery from a system with two pseudo-levitating magnets
    Autorzy:
    Mitura, Andrzej
    Kecik, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2173689.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    energy recovery
    pseudo-levitating magnets
    nonlinear dynamics
    experimental research
    odzyskiwanie energii
    magnes pseudo-lewitujący
    dynamika nieliniowa
    badanie eksperymentalne
    Opis:
    In this paper, a model of an electromagnetic system with two levitating magnets is presented. Modeling was performed using the results of experiments. The data obtained make it possible to fit the magnetic forces between two magnets using a 5th order polynomial. The time series show that dry friction constitutes an important part of damping forces. The differential equations of motion consider strong nonlinearities of magnetic and damping forces. These terms cause the nonlinear hardening effect. The energy recovered by magnetic induction is dissipated in the resistors. Numerical simulations show that resistance has an impact on magnet dynamics and energy recovery. From the resonance characteristics obtained, optimal resistance is determined when energy recovery is the highest.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 4; art. no. e141721
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and finite element analysis of PPF controller effectiveness in composite beam vibration suppression
    Autorzy:
    Mitura, Andrzej
    Gawryluk, Jaroslaw
    Powiązania:
    https://bibliotekanauki.pl/articles/2172029.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    finite element method
    positive position feedback control
    composite structures
    hysteresis
    phenomenon
    macro-fiber composite
    Opis:
    In this paper the problem of vibration reduction is considered. Generally, mechanical vibrations occurring during the operation of a system are undesirable and may have a negative effect on its reliability. A finite element model of a single active blade is developed using the Abaqus software. This structure consists of a multi-layer glass-epoxy composite beam with an embedded macro fiber composite (MFC) piezoelectric actuator. For vibration control the use of a positive position feedback (PPF) controller is proposed. To include the PPF controller in the Abaqus software, a special subroutine is created. The developed control algorithm code makes it possible to solve an additional differential equation by the fourth order RungeKutta method. A numerical dynamic analysis is performed by the implicit procedure. The beam responses with and without controller activation are compared. The control subsystem model also includes the hysteresis phenomenon of the piezoelectric actuator. Numerical findings regarding the PPF controller’s effectiveness are verified experimentally.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 3; 468--477
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of an active element for dynamic control of a thin-walled laminated beam with kinematic excitation
    Autorzy:
    Gawryluk, Jarosław
    Mitura, Andrzej
    Teter, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/140174.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    proportional control
    composite beam
    MFC
    dynamics
    FEM
    Opis:
    The paper describes the dynamics of a composite cantilever beam with an active element. The vibrations of the kinematically excited beam are controlled with the use of a Macro Fiber Composite actuator. A proportional control algorithm is considered. During the analysis, actuator is powered by a time-varying voltage signal that is changed proportionally to the beam deflection. The MFC element control system with the implemented algorithm allowed for changing the stiffness of the tested structure. This is confirmed by the numerical and experimental results. Resonance curves for the beam with and without control are determined. The results show a very good agreement in qualitative terms.
    Źródło:
    Archive of Mechanical Engineering; 2019, LXVI, 3; 379-387
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czy w organizacji szkoleń w zakresie leczenia przepuklin w Polsce potrzebne są zmiany? Wyniki badania ankietowego przeprowadzonego wśród chirurgów operujących przepukliny, a dotyczące zakresu stosowania zaleceń międzynarodowych towarzystw herniologicznych
    Autorzy:
    Mitura, Kryspin
    Dąbrowiecki, Stanisław
    Śmietański, Maciej
    Matyja, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1393354.pdf
    Data publikacji:
    2017
    Wydawca:
    Index Copernicus International
    Tematy:
    przepuklina pachwinowa
    zalecenia
    naprawa przepukliny
    Opis:
    In the therapy of an inguinal hernia, there is a huge variety in the way of treating and the choice of surgical technique. Practice shows that the intraoperative improvisation and surgeons’ own modifications of the original techniques have become part of routine procedure. No mandatory hernia registration system causes the actual detailed herniology status in our country remains unknown. The aim of the study was to summarize the results of a survey on knowledge of a hernia according to the standards developed by international hernia societies compared with everyday clinical practice. During the International Conference Hernia in Poland, which took place on 10 December 2016 in Zakopane we conducted an interactive session among 106 surgeons dealing with hernias. Surgeons responded to 66 questions about daily surgical practice and decision making in their centers, and 27 questions for the assessment of the world’s latest treatment recommendations regarding groin hernias. The most common method of using the implant technique Lichtenstein, used by 91% of doctors. 20% of surgeons in planned operations in adult men routinely uses no mesh technique. Almost 80% of respondents do not apply TEP or TAPP. Only 45.7% of surgeons customize surgical technique to the patient. Only 7 of the 27 analyzed recommendation has been accepted by more than 90% of respondents. 9 of the 27 recommendations were approved by less than half of the surgeons. In the case of 11 recommendations, surgeons simultaneously failed to comply with these recommendations in daily practice. Deficiencies in the system of training and the underfunding of medical procedures cause insufficient TAPP/ TEP availability in Poland in an inguinal hernia. Improvement of the surgeons’ knowledge on how to perform surgery
    Źródło:
    Polish Journal of Surgery; 2017, 89, 5; 12-18
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Do we need changes in the organization of training in the hernia treatment in Poland? A survey on the acknowledgment of the recommendations of international hernia societies by surgeons
    Autorzy:
    Mitura, Kryspin
    Dąbrowiecki, Stanisław
    Śmietański, Maciej
    Matyja, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1393285.pdf
    Data publikacji:
    2017
    Wydawca:
    Index Copernicus International
    Tematy:
    groin hernia
    inguinal hernia
    recommendations
    hernia repair
    Opis:
    In the therapy of an inguinal hernia, there is a huge variety in the way of treating and the choice of surgical technique. Practice shows that the intraoperative improvisation and surgeons’ own modifications of the original techniques have become part of routine procedure. No mandatory hernia registration system causes the actual detailed herniology status in our country remains unknown. The aim of the study was to summarize the results of a survey on knowledge of a hernia according to the standards developed by international hernia societies compared with everyday clinical practice. During the International Conference Hernia in Poland, which took place on 10 December 2016 in Zakopane we conducted an interactive session among 106 surgeons dealing with hernias. Surgeons responded to 66 questions about daily surgical practice and decision making in their centers, and 27 questions for the assessment of the world’s latest treatment recommendations regarding groin hernias. The most common method of using the implant technique Lichtenstein, used by 91% of doctors. 20% of surgeons in planned operations in adult men routinely uses no mesh technique. Almost 80% of respondents do not apply TEP or TAPP. Only 45.7% of surgeons customize surgical technique to the patient. Only 7 of the 27 analyzed recommendation has been accepted by more than 90% of respondents. 9 of the 27 recommendations were approved by less than half of the surgeons. In the case of 11 recommendations, surgeons simultaneously failed to comply with these recommendations in daily practice. Deficiencies in the system of training and the underfunding of medical procedures cause insufficient TAPP/ TEP availability in Poland in an inguinal hernia. Improvement of the surgeons’ knowledge on how to perform surgery
    Źródło:
    Polish Journal of Surgery; 2017, 89, 5; 12-18
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Posterior component separation – first report from Poland on new surgical technique used in major abdominal hernia treatment
    Autorzy:
    Ratajczak, Andrzej
    Bobkiewicz, Adam
    Mitura, Kryspian
    Marciniak, Ryszard
    Drews, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/1393932.pdf
    Data publikacji:
    2016
    Wydawca:
    Index Copernicus International
    Źródło:
    Polish Journal of Surgery; 2016, 88, 2; 118-123
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Posterior component separation – pierwsze polskie doniesienie o zastosowaniu nowej techniki operacyjnej w leczeniu dużych przepuklin brzusznych
    Autorzy:
    Ratajczak, Andrzej
    Bobkiewicz, Adam
    Mitura, Kryspian
    Marciniak, Ryszard
    Drews, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/1393984.pdf
    Data publikacji:
    2016
    Wydawca:
    Index Copernicus International
    Źródło:
    Polish Journal of Surgery; 2016, 88, 2; 201-215
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polish guidelines for treatment of patients with parastomal hernia
    Autorzy:
    Śmietański, Maciej
    Bury, Kamil
    Matyja, Andrzej
    Dziki, Adam
    Wallner, Grzegorz
    Studniarek, Michał
    Fridiger, Jerzy
    Szczepkowski, Marek
    Świerblewski, Maciej
    Wróblewski, Tadeusz
    Tarnowski, Wiesław
    Solecki, Rafał
    Mitura, Kryspin
    Powiązania:
    https://bibliotekanauki.pl/articles/1396115.pdf
    Data publikacji:
    2013-03-01
    Wydawca:
    Index Copernicus International
    Źródło:
    Polish Journal of Surgery; 2013, 85, 3; 152-180
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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