نتایج جستجو برای: Nonlinear frequency

تعداد نتایج: 687617  

Journal: :international journal of advanced design and manufacturing technology 0
moharam habibnejad department of mechanical engineering, irann university of science and technology aliakbar alipour

in this paper coupled nonlinear equations of motion of a suspended cable with time dependent tension and velocity are derived by using hamilton’s principal. a modal analysis for a stationary sagged cable is initially carried out in order to identify the dynamic system. the natural solution is directed to compute the natural frequencies and mode shapes of the free vibration of a suspended cable....

Journal: :international journal of advanced design and manufacturing technology 0
morteza raminnia corresponding author

in this study, thermo-mechanical nonlinear vibration of a polyethylene (pe) cylindrical shell embedded in an elastic foundation was investigated. the shell is reinforced by armchair carbon nanotubes (cnts) where characteristics of the equivalent composite being determined using mori-tanaka model. the elastic medium is simulated using the spring constant of the winkler-type,  . employing nonline...

Journal: :iranian journal of science and technology transactions of mechanical engineering 2015
j. d. simonović

multi frequency vibrations of a system of two isotropic circular plates interconnected by a rolling visco-elastic layer that has nonlinear characteristics are considered. the system with two circular plates and interconnecting discrete continually distributed rolling visco nonlinear elastic rheological elements presents the model of hybrid nonlinear system. the analytical solutions of first asy...

Journal: :Trends in Amplification 2013

Journal: :journal of computational & applied research in mechanical engineering (jcarme) 2014
m. zamanian s. a. a. hosseini

this article studied static deflection, natural frequency and nonlinear vibration of a clamped-clamped microbeam under discontinues electrostatic actuation. the electrostatic actuation was induced by applying ac-dc voltage between the microbeam and electrode plate. in contrast to previous works, it was assumed that length of the electrode plate was smaller than that of the microbeam. in additio...

Journal: :the modares journal of electrical engineering 2012
elham amini boroujeni hamid reza momeni mahdi sojoodi

non-fragile observer design is the main problem of this paper. using continuous frequency distribution, the stability conditions based on integer order lyapunov theorem are derived for lipschitz class of nonlinear fractional order systems. the proposed observer is stable beside the existence of both gain perturbation and input disturbance. for the first time, in this paper a systematic method i...

The nonlinear system becomes an area with numerous investigations over the past decades. The conventional modal analysis could not be  applied on nonlinear continuous system which makes it impossible to construct the reduced order models and obtain system response based on limited number of measurement points. Nonlinear normal modes provide a useful tool for extending modal analysis to nonlinea...

This paper presents a nonlinear model of a clamped-clamped microbeam actuated by an electrostatic load with stretching and thermoelastic effects. The frequency of free vibration is calculated by discretization based on the Differential Quadrature (DQ) Method. The frequency is a complex value due to the thermoelastic effect that dissipates energy. By separating the real and imaginary parts of fr...

In this paper, a model of frequency response has been used which shows the effect of output power of distributed generation on microgrid frequency. To have better assessment, nonlinear conditions are considered. These nonlinear conditions are delays, dead bands and limiters. A diesel generator controls the Microgrid frequency.  It can control frequency influenced by step changing in load.  A PI...

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