Development and Validation of a Flight-Identified Full-Envelope Business Jet Simulation Model Using a Stitching Architecture

The Analysis of Vehicle’s In-Flight Behaviour Using Quasi-LPV and Nonlinear Models

“…A solution to both problems may lay in modifying the model structure. For instance, autopilots for guided projectiles are usually based on a (quasi) linear parameter-varying structure (LPV) [4] that encapsulates the nonlinearities in a quasi-linear structure, allowing the use of linear autopilot design methods [5][6][7][8]. Similarly, tasks which require multiple model runs, such as global sensitivity analysis, may benefit from an easier-to-compute representation.…”

Evaluation of Unmanned Aircraft Flying/Handling Qualities Using a Stitched Learjet Model

“…The LJ-25 model is a stitched, quasi-linear, parameter-varying model developed from flight test data obtained at the USAF Test Pilot School. The stitched model refers to a "full flight-envelope, realtime simulation model composed of individual linear models and trim data for discrete flight conditions" [5]. For the LJ-25 aircraft under consideration, a full flight-envelope simulation model was created using actual flight data from five different flight and loading conditions.…”

Handling Qualities Flight Test Assessment of a Business Jet N zU P-β Fly-By-Wire Control System

“…An accurate model of the Learjet was developed 14 as a basis for the control law design and optimization. The full flight-envelope stitched 13 simulation model of the Learjet was developed from an eight-hour flight-test program with four identified point models and trim data, and used for control law design and optimization.…”

“…The model allows for accurate interpolation in airspeed, altitude, and flaps, and extrapolation in weight, inertia, and CG location. Berger et al 14 details the development and validation of the Learjet stitched model.…”

“…The gains were scaled to match more closely the stick gains of the open-loops baseline VSS configuration. 14 Figure 25 shows the normal acceleration frequency response for the baseline VSS (open-loop) Learjet and the closed-loop system with the original and updated stick gains, for the 250 kts, 15,000 ft flight condition. Note that the frequency responses are shown for stick force F lons as the input, to assess the stick force per g gradient between the configurations.…”