Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: flexural vibration

Sortuj według:

Ogranicz wyniki do:

Flexural vibration of coupled double-walled Carbon nanotubes conveying fluid under thermo-magnetic fields based on strain gradient theory

100%

Ghorbanpour Arani A. , Dashti P. , Amir S. , Yousefi M.

Journal of Theoretical and Applied Mechanics

2015

tom Vol. 53 nr 4

947--957

The flexural vibration stability of a coupled double-walled viscoelastic carbon nanotube conveying a fluid based on the Timoshenko beam (TB) model is investigated. The coupled system is surrounded by an elastic medium which is simulated as Pasternak foundation. Van der Waals (vdW) forces between the inner and outer CNTs are taken into account based on the Lenard-Jones model. Using small scale theories, Hamilton’s principle and applying two dimensional (2D) magnetic field higher order governing equations are derived. The differential quadrature method (DQM) is applied to solve partial differential equations and investigate natural frequency of the system. The effects of viscoelastic constant, magnetic field with variable magnitudes and surface stresses on natural frequency of the structure are demonstrated in this study.

Study on the experiments of the relationship between the geometric dimensions of flexural vibration disk and its vibration characteristics

72%

Yuan Y. , Ma Y. , Chen M. , Wang D. , Zhao B.

tom Vol. 18, nr 1-2

255--258

Purpose: The vibration characteristics of flexural vibration disk in ultrasonic honing system were studied systematically through experiments. Design/methodology/approach: The vibration of flexural vibration disk was tested using the acoustic system of ultrasonic honing. Findings: The results showed that the amplitude of vibration disk increases with the reducing of its thickness, when the disk was thin disk (the ratio between the thickness and radius was less than or equal to one fifths) the vibration of disk was flexural vibration, the good vibration effect could be obtained. The maximal amplitudę could reach 20.5μm,at the same time, the number of the wave crests and size could be obtained. There exist amplifying characteristics in the vibration of the disk. When the diameter of disk was not changed, the resonant frequency would decrease with the reducing of the thickness of disk. The resonance could be excited at different frequencies. The corresponding maximal amplitude value provides certain reference value for the dimensional design and application of flexural vibration disk. Research limitations/implications: From analysis, the ratio between diameter and thickness of flexural vibration disk has direct effect on amplitude. The rational diameter and thickness of flexural vibration disk should be selected according to specific machining conditions and the size requirements of the whole honing equipment during the course of design of ultrasonic honing acoustic system. Originality/value: The studied on relationship between geometric dimensions of flexural vibration disk and its vibration characteristics were made.

Dodatkowe kryteria wytrzymałościowe dotyczące bezpieczeństwa eksploatacyjnego połączenia wtłaczanego zestawu kołowego

58%

Sobaś M.

tom Nr 1

17--27

W artykule przedstawiono dodatkowe kryteria wytrzymałościowe, decydują- ce o bezpieczeństwie zestawów kołowych pojazdów trakcyjnych oraz tocznych. Kryteria te obowiązują dla przeprowadzonego prawidłowego montażu zestawu kołowego. Przedstawiono aktualny stan wiedzy na temat drgań skrętnych oraz giętnych zestawu kołowego. Omówiono również kryteria, decydujące o wytrzymałości statycznej i zmęczeniowej złącza wtłaczanego.