Computation Cuwes for Air Data System (Short Communication)

Abstract

Air data system oiaircraR measures flow variables, primarily to monitor flight safety. The computational fluid dynamics approach to the problems for evaluating air data in a typical combat aircraft flow field is to find suitable sensor locations, to detemune residual pressure correction and to compute local flow angularity at the proposed locations of sensors. The functional relationship between local flow angles and free-meam parameters being linear, it can be displayed as charts or nomograms.

Novel Approach for Angles Calibration of Air-Data Systems with Inertial Measurements

“…The estimation was performed for each of the three air-data probes (ADPs) so that 12 wind speed estimates were calculated for each flight (three probes, two estimations via a nonlinear model, and two estimations via a linear model). In accordance with the literature indications [1][2][3][4] and considering that the flight tests were carried out in levelled flight, with good weather conditions, and at sufficiently high altitude, all the solutions were obtained by assuming a constant plane aloft wind, w w E 0 (10)…”

“…Concerning the flight maneuvers, the tests are carried out at levelled flight by performing stepwise airspeed variations (to imply AOA variations) and then, at stabilized airspeeds, triangularwise AOS variations at constant heading angle, performing the so-called steady-heading side-slip (SHSS) maneuver [4,7]. In this maneuver, the pilot simultaneously applies rudder and aileron inputs to maintain a constant heading, and the aircraft performs a straight-line flight with nonzero values of the AOS and roll angle.…”

“…1) The reference angles data are directly recorded by auxiliary high-precision sensors, such as a nose-boom vane, installed on the aircraft [1,[4][5][6].…”