3824

3616

كارشناسي ارشد

طراحي كاربردي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1386

سيزده، 95، [II] ص: مصور، جدول، نمودار

ص.ع.به فارسي و انگليسي

مصطفي غيور

سعيد ضيايي راد

7/11/86

حسن نحوي، عباس فتاح

مهندسي مكانيك

ID3616

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

AbstractGovernor is a device used for maintaining a constant mean speed or rotation of the crank shaft over longperiods during which the load on the engine may vary When the load of the engine decreases the speedof the engine increases As the spindle of the governor is driven by the engine hence the speed of thespindle also increase This will increase the centrifugal force on the governor balls and the balls movesoutwards Due to the movement of balls outwards the sleeve rise upwards The upwards movement of thesleeve will operate a throttle valve at the other end of the ball crank lever to reduce the supply of theworking fluid by reducing the throttle valve opening similarly when the load on the engine increase thespeed of the engine decreases Also the speed of the spindle of the governor decrease Hence thecentrifugal force on the governor balls will also decrease The balls of the governor will move inwardsand hence the sleeve will move downwards The downwards movement of the sleeve will increase thesupply of the working fluid by increasing the opening of the throttle valve and thus the engine speed isincreased Equation governing in this system is non linear and one of the observing phenomenon resultsby non linear approach is chaos In this theses By using the fourth order Runge Kutta numericalintegration method phase diagrams Poincar e maps time history diagrams and power spectrum arepresented to observe periodic quasi periodic and chaotic motions The effect of the controlling parameterchanges in the system can be found in the bifurcation diagram largest lyapunov exponent and lyapunovdimentions Finally three methods are used to control chaos effectively

مصطفي غيور

سعيد ضيايي راد

حسن نحوي، عباس فتاح