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Dynamic stiffness formulation for a micro beam using Timoshenko–Ehrenfest and modified couple stress theories with applications
SAGE Publications - Tập 29 Số 1-2 - Trang 428-439 - 2023
J.R. Banerjee, S. О. Papkov, Thuc P. Vo, Isaac Elishakoff
Several models within the framework of continuum mechanics have been proposed over the years to solve the free vibration problem of micro beams. Foremost amongst these are those based on non-local elasticity, classical couple stress, gradient elasticity and modified couple stress theories. Many of these models retain the basic features of the Bernoulli–Euler or Timoshenko–Ehrenfest theori...... hiện toàn bộ
A hybrid command-shaper for double-pendulum overhead cranes
SAGE Publications - Tập 20 Số 1 - Trang 24-37 - 2014
Ziyad N. Masoud, Khaled A. Alhazza, Eiyad Abu‐Nada, Majed A. Majeed
A crane is generally modeled as a simple pendulum with a point mass attached to the end of a massless rigid link. Numerous control systems have been developed to reduce payload oscillations in order to improve safety and positioning accuracy of crane operations. However, large-size payloads may transform the crane model from a simple-pendulum system to a double-pendulum system. Control sy...... hiện toàn bộ
Extra-insensitive shaper with distributed delays: Design and vibration suppress analysis
SAGE Publications - Tập 26 Số 15-16 - Trang 1185-1196 - 2020
Yuqi Huang, Hongguang Li, Jiwen Zhou, Lili Meng
Distributed delays have proved beneficial in eliminating vibrations in higher frequency ranges compared to the modeled frequency, but not in improving the robustness against the modeled frequency to modeling errors. In this paper, the extra-insensitive shaper with distributed delays is proposed to improve robustness and efficiency for systems with a large variation of modal frequencies. T...... hiện toàn bộ
Optimal PI Controller with Position Feedback for Vibration Suppression
SAGE Publications - Tập 16 Số 13 - Trang 2023-2034 - 2010
Štefan Fenik, Ladislav Starek
In vibration control of distributed-parameter mechanical systems the main problem arises from endeavoring to achieve even damping in the desired frequency range and robustness simultaneously. These two important properties usually compromise each other so that more sophisticated techniques are needed to improve the vibration control of large structures. In the case of classical velocity f...... hiện toàn bộ
Rotor Casing Contact Phenomenon in Rotor Dynamics — Literature Survey
SAGE Publications - Tập 16 Số 9 - Trang 1369-1377 - 2010
Sagheer Ahmed
Rubbing between a rotor and its casing has long been recognized as a major contributor to excessive maintenance and in general to machinery failure. During contact, the high energy of the rotor, dissipated by the frictional force, can severely damage both parts, and can lead to total destruction of the machine. The purpose of this article is to provide an overview of the state of the art ...... hiện toàn bộ
Feedback chaotic synchronization of a complex chaotic system with disturbances
SAGE Publications - Tập 21 Số 15 - Trang 3067-3071 - 2015
Qiang Wei, Xingyuan Wang, Xiao Hu
In this paper, the basic dynamical properties of a complex chaotic system are investigated by the imaginary part and the real part of the complex chaotic system are separated. Based on Lyapunov stability theorem, a feedback control method is proposed for synchronization of a complex chaotic system with parameters perturbation and external disturbances. The simulation results show the feas...... hiện toàn bộ
Nonlinear vibration of conical shell with a piezoelectric sensor patch and a piezoelectric actuator patch
SAGE Publications - Tập 28 Số 11-12 - Trang 1502-1519 - 2022
Rasa Jamshidi, Ali Asghar Jafari
In this study, nonlinear vibration of a conical shell with a piezoelectric sensor patch and a piezoelectric actuator patch is evaluated. The strain displacement relation is considered to be nonlinear and based on that the equations of motion and piezoelectric sensor output signal are extracted. For the first time, nonlinear electromechanical equations of motion for the conical shell with ...... hiện toàn bộ
Control of Maglev Suspension Systems
SAGE Publications - Tập 2 Số 3 - Trang 349-368 - 1996
Y. Cai, S.S. Chen
This study investigates alternate designs for control of maglev vehicle suspension systems. Active and semiactive control-law designs are introduced into primary and secondary suspensions of maglev vehi cles. A one-dimensional vehicle with two degrees of freedom, simulating the German Transrapid Magiev System, is used. The transient and frequency responses of suspension systems and power ...... hiện toàn bộ
Adaptive observer-based synchronization of two non-identical chaotic systems with unknown parameters
SAGE Publications - Tập 23 Số 3 - Trang 389-399 - 2017
Peyman Bagheri, Mohammad Shahrokhi, Hassan Salarieh
In this study, adaptive observer-based synchronization of chaotic systems is considered. The master and slaves systems have different dynamics and it is assumed that the master system parameters are unknown while its states are available. First, it is assumed that the slave system parameters are known but its states are not completely available. It is shown that an observer for the slave ...... hiện toàn bộ
Frequency characteristics of a viscoelastic graphene nanoplatelet–reinforced composite circular microplate
SAGE Publications - Tập 27 Số 1-2 - Trang 101-118 - 2021
Aria Ghabussi, Mostafa Habibi, Omid NoormohammadiArani, Aghil Shavalipour, Hossein Moayedi, Hamed Safarpour
This is the first research on the frequency analysis of a graphene nanoplatelet composite circular microplate in the framework of a numerical-based generalized differential quadrature method. Stresses and strains are obtained using the higher order shear deformation theory. The microstructure is surrounded by a viscoelastic foundation. Rule of the mixture is used to obtain varying mass de...... hiện toàn bộ
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