Results 11 to 20 of about 427,842 (217)

Analyzing Frequency response of nano electro mechanical-resonator based on non-local elasticity theory [PDF]

مجله مدل سازی در مهندسی, 2017
  In recent years, many experimental observations showed that by decreasing the micro- and nano-beams thicknesses size effect appears and classical continuum theory cannot be used for micro- and nano-beams modeling.
mehdi maleki, hasan nahvi, mostafa ghoyour   +2 more
doaj   +1 more source

Enhancing Electrical Generation Efficiency through Parametrical Excitation and Slapping Force in Nonlinear Elastic Beams for Vibration Energy Harvesting

Sensors, 2023
This study aims to enhance conventional vibration energy harvesting systems (VEHs) by repositioning the piezoelectric patch (PZT) in the middle of a fixed–fixed elastic steel sheet instead of the root, as is commonly the case.
Yi-Ren Wang, Chun-Hsiao Kuo
doaj   +1 more source

Zamanla Değişken Kütleye Sahip Kütle Yay Sönüm Sisteminin Periyodik Olmayan Titreşimleri

Düzce Üniversitesi Bilim ve Teknoloji Dergisi, 2020
Bu çalışmada zamana bağlı üstel fonksiyon ile değişken kütleli, sönümlü, tek serbestlik dereceli sistemin titreşimleri araştırılmıştır. Literatürde sunulan birçok çalışma değişken kütleli sistemlerde reaktif kuvvetin dikkate alınması gerektiğini ...
Gözde Sarı, Yasemin Nur Aydın
doaj   +1 more source

Size-dependent nonlinear vibration analysis of nanobeam embedded in multi-layer elastic media and subjected to electromechanical and thermomagnetic loadings

Curved and Layered Structures, 2022
In this work, magneto-electro-mechanical size-dependent nonlinear vibration analysis of nanobeam embedded in multi-layer of Winkler, Pasternak, quadratic and cubic nonlinear elastic media is presented.
Sobamowo Gbeminiyi Musibau
doaj   +1 more source

Multi-frequency piezomagnetoelastic energy harvesting in the monostable mode [PDF]

Journal of Theoretical and Applied Vibration and Acoustics, 2018
The present article investigates effects of the multi-frequency excitation on the output power of a piezomagnetoelastic energy harvester. The piezomagnetoelastic power generator is assumed to operate in the mono-stable mode.
Amin Yousefpour, Arash Bahrami, Mohammad Reza Haeri Yazdi   +2 more
doaj   +1 more source

Vibration control of nonlinear dynamical system via negative cubic velocity feedback [PDF]

ERU Research Journal
    The aim of this study is to highlight how specific parameters, especially nonlinear feedback control, can enhance system stability and optimize vibration control.
O. M. khaled, E.S.M. Youssef, Y.A. Amer, M. N. Abd El-Salam, Abdullah Shref   +4 more
doaj   +1 more source

Studying the influence of external torques on the dynamical motion and the stability of a 3DOF dynamic system

Alexandria Engineering Journal, 2022
This article explores the planar motion of a novel dynamical system of three degrees of freedom (DOF) triple pendulum, consisting of a double rigid pendulum attached to an un-stretched one, in which its suspension point is considered to be fixed ...
S.A. Abdelhfeez, T.S. Amer, Rewan F. Elbaz, M.A. Bek   +3 more
doaj   +1 more source

Analytical solution of nonlinear rolling motion of ship using the method of multiple scales [PDF]

مجله مدل سازی در مهندسی, 2017
In this research, the nonlinear rolling motion of ships is studied. After obtaining the governing equation of roll motion, the method of multiple scales perturbation technique is applied to solve the nonlinear differential equation.
Mohammad Mahdi Jalili, Saeed Ebrahimi, Neda Rahmat   +2 more
doaj   +1 more source

Modelling multiple time-scales with flexible parametric survival models

BMC Medical Research Methodology, 2022
Background There are situations when we need to model multiple time-scales in survival analysis. A usual approach in this setting would involve fitting Cox or Poisson models to a time-split dataset.
Nurgul Batyrbekova, Hannah Bower, Paul W. Dickman, Anna Ravn Landtblom, Malin Hultcrantz, Robert Szulkin, Paul C. Lambert, Therese M-L. Andersson   +7 more
doaj   +1 more source

Numerical manifold method modeling of coupled processes in fractured geological media at multiple scales

Journal of Rock Mechanics and Geotechnical Engineering, 2020
The greatest challenges of rigorously modeling coupled hydro-mechanical (HM) processes in fractured geological media at different scales are associated with computational geometry.
Mengsu Hu, Jonny Rutqvist
doaj   +1 more source