An Integrated, Modular Simulation System for Education ... - Cal Poly

allows the cab to simulate actual aerodynamic control forces or feed back force or cueingproportional to any of the aircraft s current states for research into the simulated aircraft shandling qualities [Ref. 25]. The hybrid cab contributed to the simulation labs nicknamethe PhEagle.The force feedback stick provides Cal Poly with the ability to perform advancedhandling qualities research. Handling qualities is defined as flying qualities which allow amission to be accomplished with ease and precision [Ref. 7]. Feedback of the aircraftstates to the pilot is an important quantity to provide good handling qualities. Feedbackthrough the controls is important enough to be included in the MIL-STD-1797 [Ref. 7]Military Standard Flying Qualities of Piloted Aircraft. However little information isavailable about which states to feed back and how to cue the pilot through the controls.The MIL-STD-1797 provides only basic guidelines for the force gradients and one statein each control axis to be fed back (Table 1).Table 1 Aircraft control Stick and Pedal FeedbacksAxis Feedback state Force Gradient Maximum ForcePitch Nz 8 lbf/g 50 lbfRoll Roll Rate — p 1 lbf/deg/sec 25 lbfYaw Side Slip (Beta) 1 lbf/deg 100 lbfThe MIL-STD-1797 was used to set up the basic feedback for the PhEagle I. Twotypes of pilot induced oscillation (PIO) can be predicted using batch and fixed base, pilotin-the-loop,simulation [Ref. 5]. A PIO is a phenomena where the pilot sends commandsto the plane in a cyclical fashion where his input ends up sending exactly the wrongcommand to the airframe from the desired response. An example of this is trying to13