Design of a Control System to Stabilize the Aft Fuselage of a B-52 Bomber in the Presence of a Random Wind Gust.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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A control system was designed to stabilize the flexible aft-body of a B-52 bomber, under the influence of a 1.0 ftsec rms vertical wind gust. Optical instruments, mounted in the aft-body, can therefore be aimed more accurately, and with a less complex aiming device, because of the improvement in stability due to the control system. The aircraft transfer functions, which include the effects of the first seven bending modes, were obtained using digital computer programs provided by the Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Ohio, and data and equations provided by the Boeing Aircraft Corporation. The open-loop pitch-rate and normal acceleration responses to the wind gust were determined using a digital computer program called MIMIC, which simulates the functions of an analog computer. The design procedure uses the principle of superposition to minimize the effects of a wind gust disturbance on the aircraft. Modified author abstract