Temat: resonance-frequency analysis

Skocz do pozycji: 1.

Tytuł:: Предупреждение осложнений имплантации на этапе первичной фиксации имплантата
Prevention of complications of implantation at primary implant fixation
Autorzy:: Vakulenko, V.I.
Goncharenko, E.V.
Schneider, S.A.
Kovshar, I.P.
Tematy:: ортопантомография
конусно-лучевая компьютерная томография
частотнорезонансный анализ.
ортопантомографія
конусно-променева комп'ютерна томографія
частотнорезонансний аналіз.
orthopantomography
cone-beam computer tomography
resonance-frequency analysis; Pokaż więcej
Wydawca:: Uniwersytet Kazimierza Wielkiego w Bydgoszczy
Powiązania:: https://bibliotekanauki.pl/articles/1032533.pdf Link otwiera się w nowym oknie
Opis:: Статья посвящена оптимизации планирования имплантации с целью снижения осложнений на этапе первичной фиксации имплантата. Сравнивались такие методики диагностики в имплантологии, как ортопантомография и конусно-лучевая компьютерная томография. Для определения механической стабильности имплантата использовался частотно-резонансный анализ.
The article is devoted to optimization of implant planning in order to reduce complications in primary fixation of the implant. Such diagnostic techniques in implantology as orthopantomography and cone-beam computed tomography were compared. The resonancefrequency analysis was used to determine the mechanical stability of the implant.
Стаття присвячена оптимізації планування імплантації з метою зниження ускладнень на етапі первинної фіксації імплантату. Порівнювалися такі методики діагностики в імплантології, як ортопантомографія і конусно-променева комп'ютерна томографія. Для визначення механічної стабільності імплантату використовувався частотно-резонансний аналіз.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A Clamped Bar Model for the Sompoton Vibrator
Autorzy:: Wong, T. H.
Dayou, J.
Ngu, M. C. D.
Hang, J. H. W.
Liew, W. Z. H.
Tematy:: vibrator
clamped bar
single degree of freedom system
exact analysis
resonance frequency; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/176855.pdf Link otwiera się w nowym oknie
Opis:: The sompoton is one of famous traditional musical instruments in Sabah. This instrument consists of several parts with the vibrator being the most important one. In this paper, the vibrator is modeled as a clamped bar with a uniformly distributed mass. By means of this model, the fundamental frequency is analyzed with the use of an equivalent single degree of freedom system (SDOF) and exact analysis. The vibrator is made of aluminum in different sizes and is excited using a constant air jet to obtain its fundamental resonance frequency. The fundamental frequency obtained from the experimental measurement is compared with the theoretical values calculated based on the equivalent SDOF and exact analysis theories. It is found that the exact analysis gives a closer value to the experimental results as compared to the SDOF system. Although both the experimental and theoretical results exhibit the same trend, they are different in magnitude. To overcome the differences in both theories, a correction factor is added to account for the production errors.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Vibration analysis of a bucket wheel excavator boom using rayleigh’s damping model
Autorzy:: Popescu, Florin Dumitru
Radu, Sorin Mihai
Kotwica, Krzysztof
Andraș, Andrei
Kertesz (Brînaș), Ildiko
Dinescu, Stela
Tematy:: bucket wheel excavator
damping
frequency response
modal analysis
resonance
wielonaczyniowa koparka kołowa
tłumienie
pasmo przenoszenia
analiza modalna
rezonans; Pokaż więcej
Wydawca:: STE GROUP
Powiązania:: https://bibliotekanauki.pl/articles/2064357.pdf Link otwiera się w nowym oknie
Opis:: For the ERc 1400-30/7 type bucket wheel excavator (BWE) used in various Romanian open pit mines, a virtual model of the boom was constructed in SolidWorks. On this model, the variable in time forces acting during the excavation process were simulated, and the time history analysis (time response) was performed. This dynamic time response analysis was performed for excavation of homogenous material only, considering the damping as being of Rayleigh’s type, where the damping matrix is a linear combination of the mass and stiffness matrices. Based on the conducted analysis, the displacements of the boom during excavation were observed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Simulation of the frequency response of the ERC 1400 Bucket Wheel Excavator boom, during the excavation process
Autorzy:: Popescu, Florin Dumitru
Radu, Sorin Mihai
Andraș, Andrei
Kertesz (Brînaș), Ildiko
Tematy:: bucket wheel excavator
damping
frequency response
modal analysis
resonance
wielonaczyniowa koparka kołowa
tłumienie
pasmo przenoszenia
analiza modalna
rezonans; Pokaż więcej
Wydawca:: STE GROUP
Powiązania:: https://bibliotekanauki.pl/articles/2064395.pdf Link otwiera się w nowym oknie
Opis:: The paper deals with the modal analysis and frequency response analysis of a bucket wheel excavator (BWE) boom, obtained by simulation, based on a virtual model of an existing BWE boom. The boom, which generally is realized as a spatial truss, is the most vulnerable subsystem of the BWE, being submitted to severe operational loads characterized by very pronounced cyclical, dynamic and stochastic variability. This vulnerability is the consequence of its shape and constructive parameters and the nature, source and character of the external exciting loads to which it is exposed. The classical approach recommended by standards and norms cannot predict the occurrence of failures caused by vibration, which produces fatigue due to the load’s cyclical variability and the deformation produced by resonant vibration of some constitutive elements. As exciting load we considered the operational forces acting on the bucket wheel. In this manner we can take into account the constructive features - with modal analysis, and the vibration regime - with frequency response analysis. The proposed method is useful both in the design phase of new load-bearing structures of truss type subjected to high-variability forces, and also in refurbishment or improvement phases of the existing structures of this kind.
Dostawca treści:: Biblioteka Nauki

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