APPLICATION OF LINEAR ANALYSIS TO AN EXPERIMENTAL INVESTIGATION OF A TURBOJET ENGINE WITH PROPORTIONAL SPEED CONTROL

摘要

Results of an analytical and a sea-level experimental investigation of a turbojet engine with proportional speed control are presented. Linear analysis and description of the engine as a first-order linear system proved adequate for analytical prediction of the response and the stability of the controlled engine, although instability calculations were found to "be much more critical than response calculations.nOn the basis of a compromise between speed of response and oscillations, an optimum loop gain was found. Increased loop gain increased the speed of response and decreased the speed error hut ultimately led to instability characterized by an essentially constant frequency and constant amplitude oscillation. Operation near the limits of stability required a decrease in control gain with decreasing engine speed.