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ON ThE NATURAL FREQUENCIES,COMPLEX MODE FUNCTIONS,AND CRITICAL SPEEDS OF AXIALLY TRAVELING LAMINATED BEAMS:PARAMETRIC STUDY

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Acta Mechanica Solida Sinica 2011年第4期24卷 373-382页

作者： mergen h.ghayesh Department of Mechanical Engineering McGill University

The dynamic response of an axially traveling laminated composite beam is investigated analytically,with special consideration to natural frequencies,complex mode functions and critical speeds of the *** equation of motion for a symmetrically laminated system,which is in the form of a continuous gyroscopic system,is considered;the equation of motion is not discretized — no spatial mode function is *** leads to analytical expressions for the complex mode functions and critical speeds.A parametric study has been conducted in order to highlight the effects of system parameters on the above-mentioned vibration characteristics of the system.

关键词： vibration gyroscopic systems critical speeds

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Modal interactions in primary and subharmonic resonant dynamics of imperfect microplates with geometric nonlinearities

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Acta Mechanica Sinica 2016年第3期32卷 469-480页

作者： hamed Farokhi mergen h.ghayesh Department of Mechanical Engineering McGill University School of Mechanical Materials and MechatronicEngineering University of Wollongong

This paper analyses the modal interactions in the nonlinear, size-dependent dynamics of geometrically imperfect microplates. Based on the modified couple stress theory,the equations of motion for the in-plane and out-of-plane motions are obtained employing the von Kármán plate theory as well as Kirchhoff＇s hypotheses by means of the Lagrange equations. The equations of motions are solved using the pseudo-arclength continuation technique and direct timeintegration method. The system parameters are tuned to the values associated with modal interactions, and then nonlinear resonant responses and energy transfer are *** motion characteristics are shown in the form of frequency-response and force-response curves, time histories, phase-plane portraits, and fast Fourier transforms.

关键词： Modal interactions Microplate Sizedependent dynamics Modified couple stress theory Stability

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Free vibrations of beam-mass-spring systems:analytical analysis with numerical confirmation

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Acta Mechanica Sinica 2012年第2期28卷 468-481页

作者： Mohammad A.Darabi Siavash Kazemirad mergen h.ghayesh Department of Mechanical Engineering University of GuilanRasht Department of Mechanical Engineering McGill UniversityMontrealQuebecCanada H3A 2K6

Free vibrations of a beam-mass-spring system with different boundary conditions are analyzed both analyt- ically and numerically. In the analytical analysis, the system is divided into three subsystems and the effects of the spring and the point mass are considered as internal boundary con- ditions between any two neighboring subsystems. The par- tial differential equations governing the motion of the sub- systems and internal boundary conditions are then solved us- ing the method of separation of variables. In the numerical analysis, the whole system is considered as a single system and the effects of the spring and point mass are introduced using the Dirac delta function. The Galerkin method is then employed to discretize the equation of motion and the result- ing set of ordinary differential equations are solved via eigen- value analysis. Analytical and numerical results are shown to be in very good agreement.

关键词： beam-mass-spring systems Vibrations Para- metric study

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Effect of coronary artery dynamics on the wall shear stress vector field topological skeleton in fluid–structure interaction analyses

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International Journal of Mechanical System Dynamics 2023年第1期3卷 48-57页

作者： harry J.Carpenter mergen h.ghayesh Anthony C.Zander Peter J.Psaltis School of Electrical and Mechanical Engineering University of AdelaideAdelaideSouth AustraliaAustralia Vascular Research Centre Lifelong Health ThemeSouth Australian Health and Medical Research Institute(SAHMRI)AdelaideSouth AustraliaAustralia Adelaide Medical School University of AdelaideAdelaideSouth AustraliaAustralia Department of Cardiology Central Adelaide Local Health NetworkAdelaideSouth AustraliaAustralia

In this paper,we investigate the impact of coronary artery dynamics on the wall shear stress(WSS)vector field topology by comparing fluid–structure interaction(FSI)and computational fluid dynamics(CFD)*** one of the most common causes of death globally,coronary artery disease(CAD)is a significant economic burden;however,novel approaches are still needed to improve our ability to predict its *** can include the unique dynamical factors present in the coronary *** investigate the impact of these dynamical factors,we study an idealized artery model with sequential *** transient simulations made use of the hyperelastic artery and lipid constitutive equations,non‐Newtonian blood viscosity,and the characteristic out‐of‐phase pressure and velocity distribution of the left anterior descending coronary *** compare changes to established metrics of time‐averaged WSS(TAWSS)and the oscillatory shear index(OSI)to changes in the emerging WSS divergence,calculated here in a modified version to handle the deforming mesh of FSI *** suggest that the motion of the artery can impact downstream patterns in both divergence and *** magnitude is also decreased by up to 57%due to motion in some *** divergence patterns varied most significantly between simulations over the systolic period,the time of the largest *** investigation highlights that coronary dynamics could impact markers of potential CAD progression and warrants further detailed investigations in more diverse geometries and patient cases.

关键词： computational fluid dynamics divergence fluid–structure interaction topology wall shear stress

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