📘 ❞ LAMINATION SCHEME AND BOUNDARY CONDITIONS EFFECTS ON THE FREE VIBRATION OF LAMINATED COMPOSITE BEAMS ❝ كتاب ــ أسامة محمد المرضي سليمان

الهندسة الميكانيكية - 📖 ❞ كتاب LAMINATION SCHEME AND BOUNDARY CONDITIONS EFFECTS ON THE FREE VIBRATION OF LAMINATED COMPOSITE BEAMS ❝ ــ أسامة محمد المرضي سليمان 📖

█ _ أسامة محمد المرضي سليمان 0 حصريا كتاب LAMINATION SCHEME AND BOUNDARY CONDITIONS EFFECTS ON THE FREE VIBRATION OF LAMINATED COMPOSITE BEAMS 2024 BEAMS: Osama Elmardi تأليف : ABSTRACT: : In this study, the effects of both lamination scheme and boundary conditions on natural frequencies free vibration laminated composite beams were investigated The problem is analyzed solved using energy approach which formulated by a finite element model Lamination schemes for symmetric non studied Six are considered; clamped _free (CF), hinged _hinged (HH), _clamped (CC), (HC), (HF), (FF) Each beam has either movable ends or immovable It found that symmetrically anti similar size end have equal which, generally, decrease as angle orientation increases Also, more constrained higher values transverse However, to highest amongst all although they look less This behavior due fact first mode two zero (rigid body motion), replaced second be fundamental longitudinal modes same with since generated movements only But ends, in vibration, those other also الهندسة الميكانيكية مجاناً PDF اونلاين قسم خاص بكتب للتحميل مجال الميكانيكية" Mechanical engineering" والتي هي فرع هندسي يدرس الأنظمة الفيزيائية ويطبق أسس القوانين الفيزيائية الأساسية لتحليلها وإن أهم ما يميز علم الميكانيكا اعتماده على الرياضيات (بدلاً من التقدير) وعلى التجربة (بدلاً الملاحظة) حيث كيفية صياغة التنبؤات الكمية نظرياً وكيفية اختبار هذه الصياغات الرياضية بأدوات قياس مصممة بعناية و ايضا فرع هندسي يهتم بتصميم وتصنيع وتشغيل وتطوير الآلات أو الأجهزة المستخدمة مختلف قطاعات النشاطات الاقتصادية وبتعريف الموسوعة البريطانية فإن فروع تهتم بالتصميم والتطوير وبالتصنيع وبالتركيب المحركات والآلات وعمليات التصنيع وهي مهتمة بشكل بالقوى والحركة وهو علم بدراسة الطاقة بكافة صورها وتأثيرها الأجسام تخصص واسع له علاقة بكل مجالات الحياة فالهندسة تتعلق مثلا بصناعات الفضاء والطيران وبالإنتاج وتحويل وميكانيكا الأبنية والنقل وتكنولوجيا تكييف الهواء والتبريد وفي النمذجة والمحاكاة المعلوماتية A special section books field mechanical engineering, "Mechanical engineering", an engineering branch studies physical systems applies foundations basic laws analysis most important characteristic mechanics its dependence mathematics (rather than estimation) experience observation), where it established how formulate quantum predictions theory, test these mathematical formulas carefully designed measurement tools "Mechanical concerned design, manufacture, operation, development machines devices used various sectors economic activities By definition British Encyclopedia, development, installation, operation engines, machines, manufacturing processes particularly interested forces movement science studying forms objects broad discipline related areas life Mechanical with, example, aerospace, aviation, production, transformation, building mechanics, transportation, air conditioning refrigeration technology, information modeling simulation

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LAMINATION SCHEME AND BOUNDARY CONDITIONS EFFECTS ON THE FREE VIBRATION OF LAMINATED COMPOSITE BEAMS
كتاب

LAMINATION SCHEME AND BOUNDARY CONDITIONS EFFECTS ON THE FREE VIBRATION OF LAMINATED COMPOSITE BEAMS

ــ أسامة محمد المرضي سليمان

LAMINATION SCHEME AND BOUNDARY CONDITIONS EFFECTS ON THE FREE VIBRATION OF LAMINATED COMPOSITE BEAMS
كتاب

LAMINATION SCHEME AND BOUNDARY CONDITIONS EFFECTS ON THE FREE VIBRATION OF LAMINATED COMPOSITE BEAMS

ــ أسامة محمد المرضي سليمان

مميّز
عن كتاب LAMINATION SCHEME AND BOUNDARY CONDITIONS EFFECTS ON THE FREE VIBRATION OF LAMINATED COMPOSITE BEAMS:
Osama Elmardi

تأليف : أسامة محمد المرضي سليمان

ABSTRACT:

: In this study, the effects of both lamination scheme and boundary conditions on the natural frequencies of free vibration of laminated composite beams were investigated. The problem is analyzed and solved using the energy approach which is formulated by a finite element model. Lamination schemes for symmetric and non-symmetric laminated beams were studied. Six boundary conditions are considered; clamped _free (CF), hinged _hinged (HH), clamped _clamped (CC), hinged _clamped (HC), hinged _free (HF), free _free (FF). Each beam has either movable ends or immovable ends. It is found that both symmetrically and anti-symmetrically laminated beams of similar size and end conditions have equal natural frequencies which, generally, decrease as the angle of orientation increases. Also, It is found that the more constrained beams have the higher values of natural frequencies of transverse vibration. However, the free-free and hinged-free beams are found to have the highest frequencies of transverse vibration amongst all beams although they look less constrained. This behavior is due to the fact that the first mode of the two beams is equal zero (rigid body motion), and replaced by the second mode to be the fundamental mode. The values of the natural frequencies of longitudinal modes are found to be the same for all beams with movable ends since they are generated by longitudinal movements only. But for immovable ends, the clamped-free and hinged-free beams have equal frequencies in longitudinal vibration, and those of the other beams are also the same.


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