[논문]Estimation and Validation of Longitudinal Stability/Control Derivatives for the Flight Training Device of a Light Aircraft

Lee, Jung Hoon

doi:10.20910/ijase.2018.5.1.9

Estimation and Validation of Longitudinal Stability/Control Derivatives for the Flight Training Device of a Light Aircraft 원문보기

The longitudinal flight parameters of a light airplane are estimated from flight test data by use of the output error method. The reliability of the flight test measurement is examined in engineering judgment, scatter and Cramer-Rao bound, which turns out to be satisfactory with minor defects. Estimated parameter values are validated by comparing the simulated responses with the ones from actual flight tests. The FTD(Flight Training Device) of a light airplane turns out to satisfy the qualification of FAA Level 5 FTD in longitudinal motion. All the necessary practices for generation of high-fidelity data in longitudinal motion of a light aircraft are successfully performed in this study.

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가설 설정

3) Apply triple step input to the stabilator smoothly.
There seems to be several reasons for unsatisfying estimation results. First, the mathematical model for the flight dynamics used in this study is not perfect. Based on some assumptions the nonlinear equations of motion were simplified to linear versions.

제안 방법

During the flight tests, stabilator deflection, airspeed, pressure altitude, air temperature, pitch angle, pitch rate, angle of attack, x and z-directional acceleration were recorded into the onboard recorder.
Flight tests were performed for two purposes: first, production of the flight parameters; second, for generation of comparison data in order to evaluate the simulation model of the FTD which were constructed using estimated parameters.
The flight tests were performed according to the requirements of each flight phase. For the validation of the FTD in short period dynamics, doublet inputs were intentionally applied to the controls based on the aerodynamic parameter estimation. The recorded data were used as the comparison data for analyzing tolerances of the simulation results.
In this paper more than 50 hours of flight tests were performed to estimate the longitudinal stability/control derivatives and to provide ChangGong-91 FTD (Flight Training Device) with flight data[5]. Deflections of stabilator are applied as control inputs, and the behaviors of the airplane were measured by the outputs in the flight tests.
The simulation results were produced by putting the same input from the flight tests into the equations of motion FTD. The FTD simulation results, which do not satisfy the level 7 requirements for FTD, but do satisfy the requirements for level 5 FTD as set forth by the FAA Advisory Circular 120-45A, were validated by comparing the results to the results from actual flight tests in longitudinal motion. All the necessary practices for generation of high-fidelity data in longitudinal motion of a light aircraft are successfully performed in this study.
The second part of the flight tests was conducted in order to generate the comparison data for evaluating FTD simulation model with same control input. The flight tests were performed according to the requirements of each flight phase.

이론/모형

Required flight parameters for a FTD were estimated from flight test data, using the Output Error Method, which is a kind of Maximum Likelihood Estimation technique. Using initial estimates obtained from the static flight test data was helpful in producing physically reasonable estimates.
The mathematical model for this analysis is 6 degree-of-freedom linear differential equations in translational and rotational motions. They are composed of forces (X, Y, Z) and moments (L, M, N) acting on the airplane in flight[8].

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Estimation and Validation of Longitudinal Stability/Control Derivatives for the Flight Training Device of a Light Aircraft 원문보기

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Estimation and Validation of Longitudinal Stability/Control Derivatives for the Flight Training Device of a Light Aircraft 원문보기

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