000			02194cam a2200349 a 4500
003			EG-GiCUC
005			20250223031721.0
008			170508s2016 ua ho f m 000 0 eng d
040			_aEG-GiCUC _beng _cEG-GiCUC
041	0		_aeng
049			_aDeposite
097			_aM.Sc
099			_aCai01.13.13.M.Sc.2016.Mo.D
100	0		_aMoataz Magdi Mahmoud Amin Abdulhafez
245	1	0	_aDevelopment of high performance hydraulic servo and fast switching valves / _cMoataz Magdi Mahmoud Amin Abdulhafez ; Supervised Saad A. Kassem , Hubertus Murrenhoff , Mohamed A. Elgamil
246	1	5	_aتطوير صمامات هيدروليكية عالية الأداء مؤازره و صمامات سريعة الانتقال بين أوضاغ التشغيل
260			_aCairo : _bMoataz Magdi Mahmoud Amin Abdulhafez , _c2016
300			_a123 P. : _bficsimles , photographs ; _c30cm
502			_aThesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Mechanical Design and Production
520			_aIn the present work a new closed center valve concept is presented and analyzed. The valve is proposed for use as a pilot stage for a two stage servovalve. The valve operation concept is verified using MATLAB simulink and the flow rate is estimated using ANSYS Fluent. The dynamic performance is analyzed using the developed model. Using the results of the simulations, full mechanical design drawings for the servovalve are presented which is shown to be competitive with existing commercial valves. In addition to the servovalve, a fast switching valve is presented and simulated in Simulink as a pilot stage for a two stage digital valve. Different control modes are used in the simulation and the results are shown to be promising compared to existing digital valves
530			_aIssued also as CD
653		4	_aClosed center
653		4	_aFast-switching
653		4	_aServovalve
700	0		_aHubertus Murrenhoff , _eSupervisor
700	0		_aMohamed Ahmed Elgamil , _eSupervisor
700	0		_aSaad Abdelfatah Kassem , _eSupervisor
856			_uhttp://172.23.153.220/th.pdf
905			_aNazla _eRevisor
905			_aSamia _eCataloger
942			_2ddc _cTH
999			_c60836 _d60836