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    Wyświetlanie 1-9 z 9
    Tytuł:
    A new continuous model for flexural vibration analysis of a cracked beam
    Autorzy:
    Behzad, M.
    Ebrahimi, A.
    Meghdari, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/258914.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    vibration
    crack
    beam
    natural frequency
    mode shape
    weighted residual
    Opis:
    In this paper a new continuous model for vibration analysis of a beam with an open edge crack is presented. A quasi-linear displacement filed is suggested for the beam and the strain and stress fields are calculated. The equation of motion of the beam is calculated using the Hamilton principle. The calculated equation of motion is solved with a modified weighted residual method and the natural frequencies and mode shapes are obtained. The results are compared with those obtained by finite element method and an excellent agreement has been observed. The presented model is a simple and accurate method for analysis of the cracked beam behavior near or far from the crack tip.
    Źródło:
    Polish Maritime Research; 2008, 2; 32-39
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the characteristics about insulation damage based on the accelerated life tests
    Badanie charakterystyk uszkodzeń izolacji w oparciu o testy przyspieszonego starzenia
    Autorzy:
    Yang, Y. H.
    Wang, K.-S.
    Powiązania:
    https://bibliotekanauki.pl/articles/300857.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    accelerated life testing
    competing failure mode
    insulation degradation
    Gompertz-type relation shape parameter
    Opis:
    In this study the Maximum Likelihood Estimator is taken to identify the characteristics of insulation failure about the class-H motors by considering the accelerated life testing data under censored situation from Nelson. Based on the Weibull survival modeling the failure is expressed as the series connection of three modes, namely the turn, phase, and ground, respectively, the so-called competing failure. The main concern in present investigation is about the variation of shape parameters, β with the temperature. The Gompertz-type relation of βi(T) is suggested with the reference temperature, Tri for the i-th failure mode. It is found that the Tri ’s not only distinguish the characteristics of cumulative damage process about the insulation, but also involve the estimation of mean-time-to-failure (MTTF). Physically Tri denotes the turning point of varied βi as the i-th failure mode becomes moderate in a sense of less capability about the accumulation of insulation damage at higher temperature where corresponds the thermal degradation process. The numerical results indicate that the insulation technique used is acceptable as the operation temperature kept in the use condition 363K. According to the predicted lifetime as the temperature rises up to 440K, which still within the allowed range in application, the turn structure needs to be rearranged primarily, then the phase next. The ground mode has only influence on the failure at much higher temperature.
    Źródło:
    Eksploatacja i Niezawodność; 2013, 15, 4; 325-331
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vibrational Properties of Sundatang Soundboard
    Autorzy:
    Batahong, R. Y.
    Dayou, J.
    Wang, S.
    Lee, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/176904.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sundatang
    frequency response function
    impact testing
    mode shape
    Opis:
    This paper presents the measurement of vibrational properties of sundatang soundboard. Sundatang is a plucked stringed traditional musical instrument that is popular among the Kadazandusun communities in Sabah, Malaysia. The vibrational properties of the soundboard are measured using CADA-X impact hammering system in a condition where the instrument is without any string. There are two types of sundatang used in this study; one made from acacia and the other from vitex wood. In this measurement, frequency response functions (FRFs) and modal parameters of the top plate and back plate of this instrument are obtained. It is found that in free edge, fundamental frequency of both plates of acacia sundatang is greater than the vitex sundatang in a range of 112 Hz to 230 Hz. However, in clamped edge (attached to its ribs), it was modified to a lower frequency and closer to each other in the range of 55 Hz to 59 Hz. Another finding is the detection of the excitation of similar mode shape at different resonance frequencies. This phenomenon is termed as Different State of Mode (DSM) which is observed may be because the number of testing points is not enough. Findings of this study provide important information to the study of quality development of this instrument.
    Źródło:
    Archives of Acoustics; 2014, 39, 2; 177-187
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral Properties of Circular Piezoelectric Unimorphs
    Autorzy:
    Pustka, M.
    Půst, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/176831.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    piezoelectric unimorph
    natural vibrations
    resonant frequency
    mode shape
    Opis:
    The piezoelectric unimorphs are essential resonant components of many oscillating systems including electroacoustic devices. The unimorph spectral properties are namely dependent on geometric dimensions, applied materials and mounting. Preliminary dimensioning and optimization of unimorph shape are usually carried out prior to comprehensive design work mostly based on finite element method. Simple analytical model is a suitable tool for initial design phase. This paper presents a derivation of calculation model describing natural vibrations of a circular unimorph with the piezoelectric layer diameter smaller than the elastic layer diameter. The system of equations with closed-form solution is instrumental to calculation of resonant frequencies and mode shapes for unimorphs with clamped, simply supported and free circumference. The theoretical results are compared with vibration velocity measurement of clamped unimorph sample in a wide frequency range. Analytical model derived in this paper is used to assess the effect of the thickness tolerance on unimorph resonant frequencies.
    Źródło:
    Archives of Acoustics; 2017, 42, 4; 743-751
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model order reduction of Mikota’s vibration chain including damping effects by means of proper orthogonal decomposition
    Autorzy:
    Weber, W. E.
    Zastrau, B. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/282041.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    Mikota’s vibration chain
    POD
    damping, multibody system
    mode shape
    Opis:
    In engineering disciplines, both in scientific and practical applications, systems with a tremendous number of degrees of freedom occur. Hence, there is a need for reducing the computational effort in investigating these systems. If the system behaviour has to be calculated for many time instances and/or load scenarios, the need for efficient calculations further increases. Model order reduction is a common procedure in order to cope with such large systems. The aim of model order reduction is to reduce the (computational) effort in solving the given task while still keeping main features of the respective system. One approach of model order reduction uses the proper orthogonal decomposition. This approach is applied to Mikota’s vibration chain, a linear vibration chain with remarkable properties, where two cases of an undamped and a damped structure are investigated.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2018, 56, 2; 511-521
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Buildability of Mortar Feedstock in Material Extrusion Additive Manufacturing
    Autorzy:
    Park, Jinsoo
    Lee, Hojae
    Choi, Hanshin
    Powiązania:
    https://bibliotekanauki.pl/articles/354837.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    additive manufacturing
    mortar feedstock
    shape retention ability
    buildability
    overlaying mode
    Opis:
    Mortar feedstock is extruded to form bead and it is selectively placed line by line in the material extrusion additive manufacturing. With respects to part building process healthiness, load-supporting ability of overlaid beads is emphasized as buildability. Buildability is primarily dependent on thixotropic properties of feedstock and vertical overlapping schedule. In the present study, water-to-binder (w/b) ratio was chosen as material aspect to assess buildability. Uneven bead shape evolution and premature failure were highlighted owing to low yield stress of high w/b ratio feedstock. Feedstock with optimum w/b ratio showed good buildability even at the interval time of 19 sec.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1069-1072
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Residual life estimation of healthy and cracked composite beam using experimental and numerical modal analysis methods
    Autorzy:
    Ramprasad, Gedela
    Ramakrishna, Shinigam
    Powiązania:
    https://bibliotekanauki.pl/articles/1819194.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    E-glass fiber
    Epoxy fiber
    composite healthy beam
    composite cracked beam
    mode shape
    natural frequency
    FFT analysis
    crack location
    ACP
    ACP pre
    ACP post
    belka kompozytowa
    analiza modalna
    częstotliwość naturalna
    analiza FFT
    Opis:
    Preventive maintenance is beneficial to minimize unexpected breakdowns in industries with continuous production. Composite structures are used for naval applications like ship hulls and marine propellers. In most of the industries, composite structural health analysis using experimental and numerical model are available for damage detection and estimate the residual life of composite beams. The present work is focusses on identification of damage and estimate residual life of composite healthy and cracked beams. Free vibrational analysis is carried out on composite beam made of Glass fiber reinforced polymer (GFRP) with a different crack orientation. A Fast Fourier Transform (FFT) spectrum analyzer associated with engineering data management (EDM) software utilized for experimental analysis to detect presence of damage in cracked composite beam. Finite element method (FEM) software called Analysis of composite pre/post (ACP) available in ANSYS R3 is used to compare the natural frequency results of healthy composite beam with cracked composite beam with different ply orientations. For validation of numerical modal evaluation, the consequences acquired from ANSYS R3 Finite element analysis (FEA) software are in comparison with experimental results received by impact hammer method. The fatigue life of a damaged composite beam is estimated the use of “Hwang and Han’s” fatigue life equation.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2020, 4, 2; 127--134
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibilities of using the FEM optimization package to improve the structure of self-supporting stairs in a building
    Możliwości zastosowania pakietu optymalizacyjnego FEM do poprawy konstrukcji samonośnych schodów w budynku
    Autorzy:
    Jurkowski, Sławomir
    Kulawik, Edmund
    Powiązania:
    https://bibliotekanauki.pl/articles/2130860.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Nowym Sączu
    Tematy:
    FEM
    optimization
    mode shape
    resonance
    staircase
    ANSYS
    MES
    optymalizacja
    postać drgań własnych
    rezonans drgań
    klatka schodowa
    Opis:
    The article presents the results of the analyzes on the influence of the optimization self-supporting staircase geometry on its strength and dynamic properties. The primary goal was to achieve a structure with a lower mass. The Topology Optimization tool from the ANSYS package allowed to the elimination of the finite elements carrying the smallest stresses from the structure. The iterative approach resulted in a systematic reduction of the model mass up to decrease by 40 (%). The reduction in the structure led to a decrease in its strength - the safety factor decreased from 5.95 to 4.92. The influence of the optimization of the structure on its dynamic properties was determined as an additional aim of the study.
    Artykuł przedstawia wyniki analiz dotyczące wpływu optymalizacji geometrii klatki schodowej o konstrukcji samonośnej na jej właściwości wytrzymałościowe oraz dynamiczne. Podstawowym celem było uzyskanie konstrukcji o mniejszej masie. Wykorzystanie narzędzia Topology Optimization z pakietu ANSYS pozwoliło na wyeliminowanie z konstrukcji elementów skończonych przenoszących najmniejsze naprężenia. Iteracyjne podejście skutkowało systematyczną redukcją masy modelu aż do założonego jej spadku o 40 (%). Redukcja ta doprowadziła do nieznacznego zmniejszenia wytrzymałości konstrukcji - współczynnik bezpieczeństwa zmniejszył się z poziomu 5,95 do 4,92. Jako dodatkowy cel badania założono ustalenie wpływu przeprowadzenia optymalizacji konstrukcji na jej cechy dynamiczne.
    Źródło:
    Journal of Engineering, Energy and Informatics; 2021, 1; 18-28
    2720-4162
    2720-5541
    Pojawia się w:
    Journal of Engineering, Energy and Informatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correction of Evanescent Wave Influence on the Flexural Wave Velocity and Wavelength Estimation Based on a Mode Shape Function
    Autorzy:
    Pantelić, Filip
    Šumarac Pavlović, Dragana
    Mijić, Miomir
    Ridley-Ellis, Daniel
    Powiązania:
    https://bibliotekanauki.pl/articles/31339954.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    mode shape function
    flexural wave velocity
    very near field
    Opis:
    The aim of this research is to use a simple acoustic method of a very near field recording, which enables measurement and display of oscillation modes, to estimate the velocity of flexural waves, based on the wavelengths of standing waves measured on the sample. The paper analyses cases of 1D geometry, flexural waves that occur on a beam excited by an impulse. Measurements were conducted on two different samples: steel and a wooden beam of the same length. Due to the appearance of evanescent waves at the boundary regions, the distance between the nodes of standing waves that occur deviates from half the wavelength, which can be compensated using a correction factor. Cases of fixed and free boundary conditions were analysed. By quantifying how much the boundary conditions change the mode shape function, it can be predicted how the mode of oscillation changes if the boundary conditions change, which can also find application in musical acoustics and sound radiation analysis.
    Źródło:
    Archives of Acoustics; 2022, 47, 4; 539-546
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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