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random-vibration-analysis
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Free and forced random vibration analysis of sandwich plates with thick viscoelastic cores
, Article JVC/Journal of Vibration and Control ; Volume 19, Issue 14 , 2013 , Pages 2223-2240 ; 10775463 (ISSN) ; Haddadpour, H ; Navazi, H. M ; Sharif University of Technology
2013
Abstract
Free vibrations and the transverse response of sandwich plates with viscoelastic cores under wide-band random excitation is studied with special attention to the so-called pumping, thickness-shear and stretching modes. The quadratic displacement field is adopted for all displacement components of the core to accurately capture the higher modes excited by the wide-band excitation. The Love-Kirchhoff plate theory is used for the face layers. The viscoelastic behavior of the core is modeled by the Golla-Hughes-McTavish method. An analytical solution using the normal mode method is provided for the simply supported boundary conditions by including a different family of modes. The effects of some...
A finite element model for tapered laminated beams incorporated with magnetorheological fluid using a layerwise model under random excitations
, Article Mechanics of Advanced Materials and Structures ; Apr , 2018 , Pages 1-8 ; 15376494 (ISSN) ; Zabihollah, A ; Behzad, M ; Sharif University of Technology
Taylor and Francis Inc
2018
Abstract
Laminated composite beams with variable thickness are being widely used in many engineering applications. To enhance the dynamic behavior of structures subject to random loading, tapered laminated beams incorporated with magnetorheological (MR) fluids (MR-tapered beam) are proposed. A finite element model has been developed for random vibration analysis of MR-tapered beam based on layerwise displacement theory. The effects of thickness ratios of tapered beam, magnetic fields, statistical properties, correlation and autocorrelation on dynamic behaviors of structures have been investigated. The proposed structural element significantly enhances the dynamic response of MR-tapered beam under...
A finite element model for tapered laminated beams incorporated with magnetorheological fluid using a layerwise model under random excitations
, Article Mechanics of Advanced Materials and Structures ; Volume 27, Issue 1 , 2020 , Pages 12-19 ; Zabihollah, A ; Behzad, M ; Sharif University of Technology
Taylor and Francis Inc
2020
Abstract
Laminated composite beams with variable thickness are being widely used in many engineering applications. To enhance the dynamic behavior of structures subject to random loading, tapered laminated beams incorporated with magnetorheological (MR) fluids (MR-tapered beam) are proposed. A finite element model has been developed for random vibration analysis of MR-tapered beam based on layerwise displacement theory. The effects of thickness ratios of tapered beam, magnetic fields, statistical properties, correlation and autocorrelation on dynamic behaviors of structures have been investigated. The proposed structural element significantly enhances the dynamic response of MR-tapered beam under...
Flutter analysis of a nonlinear airfoil using stochastic approach
, Article Nonlinear Dynamics ; Volume 84, Issue 3 , 2016 , Pages 1735-1746 ; 0924090X (ISSN) ; Sazesh, S ; Molazadeh, V. R ; Sharif University of Technology
Springer Netherlands
Abstract
In this paper, the dynamic instability of a nonlinear system has been studied using the stochastic vibration analysis and employing statistical properties of the system response. In this method neither the time domain analysis nor limit cycle oscillations were used. A two degrees-of-freedom airfoil subjected to an aerodynamic quasi-steady flow with a nonlinear torsional spring was considered as the case study. The spring nonlinearity was examined in hardening and softening states. A random force in the form of the white noise with Gaussian function was added to the aerodynamic lift force. The statistical linearization and random vibration analysis were applied to the nonlinear system to...