Dynamic characterization of a laminated composite magnetorheological fluid sandwich plate
TL;DR: In this article, the authors investigated the effect of a magnetic field on the variation of the natural frequencies and loss factors of a laminated composite magnetorheological (MR) fluid sandwich plate under various boundary conditions.
Abstract: This study investigates the dynamic properties of a laminated composite magnetorheological (MR) fluid sandwich plate. The governing differential equations of motion of a sandwich plate embedding a MR fluid layer as the core layer and laminated composite plates as the face layers are presented in a finite element formulation. The validity of the developed finite element formulation is demonstrated by comparing the results in terms of the natural frequencies derived from the present finite element formulation with those in the available literature. Various parametric studies are also performed to investigate the effect of a magnetic field on the variation of the natural frequencies and loss factors of the MR fluid composite sandwich plate under various boundary conditions. Furthermore, the effect of the thickness of the MR fluid layer and the ply orientation of the composite face layers on the variation of the natural frequencies and loss factors are studied. The free vibration mode shapes under various boundary conditions of a MR fluid laminated composite sandwich plate are also presented. The forced vibration response of a MR fluid composite plate is investigated to study the dynamic response of the sandwich plate under harmonic force excitations in various magnetic fields. The study suggests that the natural frequency increases with increasing magnetic field, irrespective of the boundary conditions. The reduction in peak deflection at each mode under a harmonic excitation force with variation of the applied magnetic field shows the effectiveness of the MR fluid layer in reducing the vibration amplitude of the composite sandwich plate.
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TL;DR: In this paper, a study on the free vibrational behavior of sandwich panels with flexible core in the presence of smart sheets of oil which are capable of the excitation of magnetic field is presented.
Abstract: This is the first study on the free vibrational behavior of sandwich panels with flexible core in the presence of smart sheets of oil which is capable of the excitation of magnetic field. In order to model the core, the improved high order theory of sandwich sheets was used by a polynomial with unknown coefficients first degree shear theory was used for the sheets. The derived equations based on Hamilton principle with simple support boundary condition for upper and lower sheets were solved using Navier technique. Accuracy and precision of the theory were investigated by comparing the results of this study with those of analytical and numerical works. In the conclusion section, effect of the intensity of magnetic field and other physical parameters including ratio of sheet's length to width, ratio of sheet's length to thickness, ratio of core thickness to sheet's overall thickness, and ratio of oil layer thickness to sheet's overall thickness on natural frequency was investigated. © 2016 IAU, Arak Branch.All rights reserved.
7 citations
TL;DR: In this paper, the vibration analysis of a laminated composite magnetorheological elastomer (MRE) sandwich beam is presented in a finite element formulation, where the governing differential equations of motion of a sandwich beam embedding a MRE layer as core layer and laminate composite beams as the face layers are presented.
Abstract: In this study, the vibration analysis of a laminated composite magnetorheological elastomer (MRE) sandwich beam is presented. The governing differential equations of motion of a sandwich beam embedding a MRE layer as core layer and laminated composite beams as the face layers are presented in a finite element formulation. The validity of the developed finite element formulation is demonstrated by comparing results in terms of the natural frequencies derived from the present finite element formulation with those in the available literature. Various parametric studies are also performed to investigate the effect of a magnetic field on the variation of the natural frequencies and loss factors of the MR elastomer composite sandwich beam under various boundary conditions. Furthermore, the effect of the thickness of the MR elastomer layer on the variation of the natural frequencies and loss factors are studied. The study suggested that the natural frequency increases with increasing magnetic field, irrespective of the boundary conditions.
7 citations
Cites background from "Dynamic characterization of a lamin..."
...[9] investigated the dynamic properties of a laminated composite MR fluid sandwich plate....
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TL;DR: Magnetorheological (MR) materials are kinds of smart materials whose rheological characteristics are controllable with the application of external magnetic fields as discussed by the authors, and they have been used in many applications.
Abstract: Magnetorheological (MR) materials are kinds of smart materials whose rheological characteristics are controllable with the application of external magnetic fields. In the last few decades, MR mater...
6 citations
01 Jan 2015
TL;DR: It is revealed that the population of Ireland has changed significantly in the last century, with an increase in the number of people migrating from the East to the West and in numbers in general.
Abstract: هلاقم تاعلاطا هدیکچ لماک یشهوژپ هلاقم :تفایرد 04 نیدرورف 1393 :شریذپ 11 دادرخ 1393 :تیاس رد هئارا 16 رهم 1393 فاطعنا هتسه اب یچیودناس قرو کی نییاپ تعرس اب یضرع هبرض و دازآ تاشاعترا خساپ ،هلاقم نیا رد دنمشوه هدام سنج زا ریذپ یسیطانغم تسا هتفرگ رارق هعلاطم دروم . قرو یچیودناس یلیطتسم زا کی هتسه اب تیلباق کیرحت یسیطانغم و ود هیلا هدننکدیقم تسا هدش لیکشت . هدام یسیطانغم رد تدش ياه نادیم ،فلتخم یسیطانغم صاوخ یتوافتم زا دوخ ناشن یم دهد . تلاداعم تکرح رب مکاح هب کمک لصا نوتلیماه جارختسا هدش .تسا لح تلاداعم اب هدافتسا زا دنیارف یلیلحت هیروف ياه يرس ندرب راکب اب کیتامتسیس تسدب هدمآ تسا . هب کمک شور لح يداهنشیپ سناکرف ياه ،یعیبط ياهروتکاف كلاهتسا هزاس ،يا يورین دروخرب و زیخ یضرع قرو تسدب هدمآ تسا . ،نینچمه يورین عبات دروخرب هب کمک لدم مرج و رنف ود هجرد يدازآ هب تروص یلیلحت تسدب هدمآ تسا . تارثا تارییغت تدش نادیم یسیطانغم رب يور ،سناکرف ياهروتکاف ،كلاهتسا يورین رییغت ،سامت لکش ياه قرو و هبرض هدننز هعلاطم هدش تسا . زا قرو لداعم مرج هبساحم روظنم هب سناکرف یعیبط هیاپ تسدب هدمآ هلئسم لح زا رادقم .تسا هدش هدافتسا هژیو مرج لداعم هدش لصاح قرو رد دم یلیلحت ل مرج و رنف .تسا هدش هدافتسا جیاتن تسدب هدمآ ناشن یم دهد هک اب رییغت کیتامتسیس تدش نادیم یسیطانغم هتسه ینایم یم ناوت هب بیترت رادقم ،یتفس كلاهتسا ياهروتکاف هزاس يا و هنیشیب يورین دروخرب ار رییغت هداد و لرتنک درک . :ناگژاو دیلک یسیطانغم هدام هبرض نییاپ تعرس تاشاعترا قرو دنمشوه
5 citations
15 Jan 2020
TL;DR: This study presents a comprehensive review to investigate the fundamentals of MRf and manufacturing and applications of MRF-based systems and according to the existing works and current and future demands, the trend for future research in this field is recommended.
Abstract: The magnetorheological fluids (MRF) are a generation of smart fluids with the ability to alter their variable viscosity. Moreover, the state of the MRF can be switched from the semisolid to the fluid phase and vice versa upon applying or removing the magnetic field. The fast response and the controllability are the main features of the MRF-based systems, which make them suitable for applications with high sensitivity and controllability requirements. Nowadays, MRF-based systems are rapidly growing and widely being used in many industries such as civil, aerospace, and automotive. This study presents a comprehensive review to investigate the fundamentals of MRF and manufacturing and applications of MRF-based systems. According to the existing works and current and future demands for MRF-based systems, the trend for future research in this field is recommended.
5 citations
Cites background from "Dynamic characterization of a lamin..."
...The MRF composite has potential applications in aerospace, civil infrastructures, and automobile industries to suppress the excessive vibrations and\or control the sound propagation, as presented in Table 1 [69]....
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References
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TL;DR: In this paper, the authors review the recent and rapid developments in semi-active structural control and its implementation in full-scale structures, and present an alternative to active and hybrid control for structural vibration reduction.
Abstract: In recent years, considerable attention has been paid to research and development of structural control devices, with particular emphasis on alleviation of wind and seismic response of buildings and bridges. In both areas, serious efforts have been undertaken in the last two decades to develop the structural control concept into a workable technology. Full-scale implementation of active control systems have been accomplished in several structures, mainly in Japan; however, cost effectiveness and reliability considerations have limited their wide spread acceptance. Because of their mechanical simplicity, low power requirements, and large, controllable force capacity, semiactive systems provide an attractive alternative to active and hybrid control systems for structural vibration reduction. In this paper we review the recent and rapid developments in semiactive structural control and its implementation in full-scale structures.
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TL;DR: In this article, a semi-active control of vehicle suspension system with magnetorheological (MR) damper is presented and performance testing is done for this damper with INSTRON machine.
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240 citations
01 Jul 2001
TL;DR: In this article, the modes of operation of MR fluid devices are analyzed and a comprehensive review is presented of the principles, characteristics and engineering applications of the MR fluids devices (especially dampers) studied in the last decade.
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206 citations