Variable nozzle control system of high-speed wind tunnel

摘要

PURPOSE:To prevent the thin plate of a variable nozzle from damaging by providing plural jamming circuits for correcting a stroke control signal so that a control deviation decreases as much as possible when detected strain exceeds a set value for warning. CONSTITUTION:When the strain detected by a strain detector 30 exceeds the set value for warning, the output signal F of a 1st comparator 34 goes up above 'H' level and contacts 41, 47, and 48 are switched, so a control deviation signal E is supplied to a 1st amplifier 42 through an input path Lo and the contact 41 and an amplified signal E1 is supplied to an integrator 46 through a limiter 44 and a 2nd amplifier 45 and integrated, so that the signal is outputted as a correcting signal SL. The signal SL corresponding to the signal E is supplied to a subtracter 27 right after the contact 41 is made and the stroke control signal SV from a stroke computing element 22 is subtracted, so this processing is carried on until the control deviation becomes zero. Thus, motor-driven jacks are placed in a jamming state gradually and stopped finally. The thin plate is therefore prevented from damaging.