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

observed, the Euler block was flown using the stick and no other dynamics to confirmthe correct responses to the commanded input rates.Trim Attitude and SpeedSince the model is linear and actual aircraft are highly nonlinear, the model isvalid only for small perturbations from the initial trim conditions. It is difficult to seewhen the model has departed from the conditions where the model is valid. Since thesame model is available in the three levels of complexity a side by side comparison of themodels is possible.FeelTransfer function and state space models are perfect for setting up anddetermining the feel system dynamics. Models with known dynamics can be quicklycreated to test various states fed back to the feel system to determine if feeding back thestate has positive, negative, or no effects on the handling qualities. The effects of the feelsystem itself can be modeled and tested by using a simple but known transfer function todetermine the effects of the dynamics of the feel system. For example if the Nz/dE (gforces to elevator deflection) transfer function is known, the pitch feel system can use theoutput to send to the stick force.6-DOF Non linearNon-linear simulations require no modifications to the auto-coding process. TheS-function containing the non-linear equations of motion are included in the Simulinkmodel and connected to the aerodynamic, gear, and thrust model. The source code isplaced in the Matlab search path to allow the code to be included in the final program.53