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

A technology of atmospheric data and genetic algorithm, applied in the direction of gene model, etc., can solve problems such as complex operation of real number product operator, achieve large coverage, improve measurement accuracy and anti-interference ability, and benefit the effect of global selection

Inactive Publication Date: 2011-07-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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 o...

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

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Embodiment Construction

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0029] see figure 2 Pressure measuring hole layout method flow. Select the reference aircraft attitude α r = 0°, ±4°, β r =0°, ±2°Use computational fluid dynamics software to calculate the pressure distribution on the head of the aircraft. Computational Fluid Dynamics (CFD) is the analysis of a system including fluid flow and heat transfer and other related physical phenomena through computer numerical calculation and image display. CFD replaces the original continuous fields of physical quantities in the time domain and space domain, such as velocity field and pressure field, with a series of variable value sets on a finite number of discrete points, and establishes information about these discrete points through certain principles and methods. Then solve the algebraic equations to obtain the approximate value of the field variables, where the pressure ...

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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...

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Application Information

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IPC IPC(8): G06N3/12
Inventor 陆宇平刘彦斌张勇肖地波
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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