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RISS 인기검색어
- 검색키워드
- 저자 : Abdel Magid Hamouda (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Arameh Eyvazian,Abdel Magid Hamouda,Faris Tarlochan,Saeid Mohsenizadeh,Ali Ahmadi Dastjerdi 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.33 No.6
This study considers the instability behavior of sandwich plates considering magnetorheological (MR) fluid core and piezoelectric reinforced facesheets. As facesheets at the top and bottom of structure have piezoelectric properties they are subjected to 3D electric field therefore they can be used as actuator and sensor, respectively and in order to control the vibration responses and loss factor of the structure a proportional-derivative (PD) controller is applied. Furthermore, Halpin-Tsai model is used to determine the material properties of facesheets which are reinforced by graphene platelets (GPLs). Moreover, because the core has magnetic property, it is exposed to magnetic field. In addition, Kelvin-Voigt theory is applied to calculate the structural damping of the piezoelectric layers. In order to consider environmental forces applied to structure, the visco-Pasternak model is assumed. In order to consider the mechanical behavior of structure, sinusoidal shear deformation theory (SSDT) is assumed and Hamilton's principle according to piezoelasticity theory is employed to calculate motion equations and these equations are solved based on differential cubature method (DCM) to obtain the vibration and modal loss factor of the structure subsequently. The effect of different factors such as GPLs distribution, dimensions of structure, electro-magnetic field, damping of structure, viscoelastic environment and boundary conditions of the structure on the vibration and loss factor of the system are considered. In order to indicate the accuracy of the obtained results, the results are validated with other published work. It is concluded from results that exposing magnetic field to the MR fluid core has positive effect on the behavior of the system.
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Bird strike analysis on a typical helicopter windshield with different lay-ups
Reza Hedayati,Saeed Ziaei-Rad,Arameh Eyvazian,Abdel Magid Hamouda 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.4
In the current paper, bird strike to a typical helicopter windshield is investigated using smoothed particles hydrodynamic (SPH) finiteelement method. Five types of lay-ups in a windshield (single layer stretch acrylic, single layer glass, two-wall cast acrylic, acrylic withPolyvinyl butyral (PVB) interlayer and glass with PVB interlayer) is considered and in each case the thickness which prevents the birdfrom perforating the windshield is calculated. Since helicopters can have lateral movement in addition to their longitudinal movement,the effect of incident angle on the integrity of windshield is also investigated. Simulations showed that among the five cases presented,glass with PVB interlayer can be the best choice for being used in windshield against bird strike. Another conclusion is that for the sameinitial velocity, the angled impact can cause more damage in the windshield than the direct impact.
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