Layout method for embedded air data sensing system pressure hole based on genetic algorithm

Abstract

The invention discloses a layout method for an embedded air data sensing system pressure hole based on a genetic algorithm, comprising the following steps: taking an initial supposition position (xi, yi and zi) as the input of a value function; converting coordinates xi, yi and zi into a circumferential angle phi i of and a conical angle lambda i; simulating to obtain the pressure value Pi of the point on the surface of an aircraft by the computational fluid mechanics according to a real angle of attack alpha r, a sideslip angle beta r and a given mach number, wherein the pressure value of a stagnation point is real total pressure Ptr; adding generally distributed random noise epsilon N on the pressure value Pi to simulate pressure measuring inaccuracy; calculating the angle of attack, the sideslip angle and the pressure of the stagnation point by the values with 'noise'; comparing the angle and the pressure of the stagnation point which are obtained by estimation, with a reference value under each simulation situation; and calculating the value function by the weighted sum of an error ( which is the difference of an estimation value and the reference value) mean square root.

Description

technical field [0001] The invention relates to a method for determining a detection point of an air data sensor, in particular to a method for applying a genetic algorithm to layout pressure measuring holes of an embedded air data sensing (Flush Airdata Sensing, FADS) system. Background technique [0002] The FADS system measures flight parameters including dynamic pressure, static pressure, angle of attack, and sideslip angle through a pressure sensor array installed on the front circumference of the aircraft's head. Usually, four air pressure sensors are arranged on a certain cross-section of the aircraft head (blunt body or cone) to measure static pressure and angle of attack, and one air pressure sensor is placed at the apex of the blunt body or cone. Sensors are used to measure total pressure, such as figure 1 shown. [0003] The layout of the pressure hole array has an impact on the calculation accuracy of air data parameters such as angle of attack, angle of sidesl...

AI Technical Summary

Problems solved by technology

In order to achieve this method, the cross-sectional position of the installed sensor must be pre-set (referred to as "station" in the literature), so this method can only find the layout on the optimal station. In fact, the layout on the optimal station is not The optimal position of the aircraft head (cone or blunt body), this is the limitation of this method, and the real number product operator operation becomes more complicated as the number of stations increases

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