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| 003 | EG-GiCUC | ||
| 005 | 20250223032037.0 | ||
| 008 | 180902s2018 ua dh f m 000 0 eng d | ||
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_aEG-GiCUC _beng _cEG-GiCUC |
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| 041 | 0 | _aeng | |
| 049 | _aDeposite | ||
| 097 | _aPh.D | ||
| 099 | _aCai01.13.01.Ph.D.2018.Ho.I | ||
| 100 | 0 | _aHossam Taha Abdelaziz Ahmed Badran | |
| 245 | 1 | 0 |
_aImproving dynamic and aeroelastic performance of helicopter rotors using periodic design and piezo active control / _cHossam Taha Abdelaziz Ahmed Badran ; Supervised Hani M. Negm , Mohammad Tawfik |
| 246 | 1 | 5 | _aتحسين الأداء الدينامى و المرونة الهوائية لدوار الهليكوبتر باستخدام التصميم الدوري و التحكم التلقائى بالمواد الكهربية الإجهادية |
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_aCairo : _bHossam Taha Abdelaziz Ahmed Badran , _c2018 |
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_a127 P. : _bcharts , facsimiles ; _c30cm |
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| 502 | _aThesis (Ph.D.) - Cairo University - Faculty of Engineering - Department of Aerospace Engineering | ||
| 520 | _aIn the present study, we improve the vibration characteristics of sandwich helicopter rotor blades with periodic changes in the core material. This technique preserves the external geometry of the rotor blades to keep their aerodynamic characteristics.Since the construction and air velocity change along the rotor blade, we use the finite element technique in its dynamical and aeroelastic analyses. Theodorsen's 2-D thin airfoil theory with a lift deficiency function is used in the unsteady aerodynamic analysis, with a correction which takes into consideration that each blade falls in the wake of the preceding blade. Results of the analyses show significant improvement in the dynamic response and flutter speeds of helicopter rotors in both hovering and forward flight, as a result of using the periodic design technique of the blades. Introducing piezoelectric smart material in the core design of the blades together with active automatic control is shown to further improve the dynamic characteristics of the helicopter rotor | ||
| 530 | _aIssued also as CD | ||
| 653 | 4 | _aHelicopter rotors | |
| 653 | 4 | _aPeriodic design | |
| 653 | 4 | _aVibration attenuation | |
| 700 | 0 |
_aHani Mohammad Elmorsy Negm , _eSupervisor |
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| 700 | 0 |
_aMohammad Tawfik Aboelsooud , _eSupervisor |
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| 856 | _uhttp://172.23.153.220/th.pdf | ||
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_aEnas _eCataloger |
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_aNazla _eRevisor |
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_2ddc _cTH |
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