Abstract
As far as airborne sensors are concerned, the measurement accuracy is an important indicator that cannot be ignored and may directly affect final measurement results. In order to improve the measurement accuracy of a flush air data sensing (FADS), which is an advanced sensor, this paper proposed a new method based on the normal cloud model and the multi-objective programming (MOP). First, the high-precision FADS model is established by using the database obtained with the CFD software and aerodynamics knowledge. Meanwhile, the uncertainty and randomness of signals caused by measurement noise are quantitatively analyzed by using the normal cloud model. Then, in the process of data fusion, a new method for calculating the weights is proposed based on the slack variable method and the Lagrange multiplier method. The simulation results show that the proposed method can improve the measurement accuracy by 3.2% and reduce the dispersion of measurement data by 68.88%.
Highlights
FADS 系统测量原理Pi = qc[cos2(θi) + εsin2(θi)] + P∞ (1) 式中: Pi 为第 i 个测压孔的压强值;qc 为大气动压;ε 为修正系数,受迎角 α、侧滑角 β 和马赫数 Ma 同时影 响,记为 ε = f(α,β,Ma);θi 为来流入射角,是测压孔 的位置角(圆周角 φi 和圆锥角 λi)、迎角和侧滑角的 函数,记为 cos(θi) = cosαcosβcosλi + sinαsinφisinλi +
In order to improve the measurement accuracy of a flush air data sensing ( FADS), which is an advanced sensor, this paper proposed a new method based on the nor⁃ mal cloud model and the multi⁃objective programming ( MOP)
The high⁃precision FADS model is established by using the database obtained with the CFD software and aerodynamics knowledge
Summary
Pi = qc[cos2(θi) + εsin2(θi)] + P∞ (1) 式中: Pi 为第 i 个测压孔的压强值;qc 为大气动压;ε 为修正系数,受迎角 α、侧滑角 β 和马赫数 Ma 同时影 响,记为 ε = f(α,β,Ma);θi 为来流入射角,是测压孔 的位置角(圆周角 φi 和圆锥角 λi)、迎角和侧滑角的 函数,记为 cos(θi) = cosαcosβcosλi + sinαsinφisinλi +. Pi = qc[ cos2( θi) + εsin2( θi) ] + P∞ Pj = qc[ cos2( θj) + εsin2( θj) ] + P∞ Pk = qc[ cos2( θk) + εsin2( θk) ] + P∞ 联立方程得到. (1 - ε)cos2(θi) - (1 - ε)cos2(θj) = cos2(θi) - cos2(θj) (1 - ε)cos2(θj) - (1 - ε)cos2(θk) cos2(θj) - cos2(θk). 式中, θi,θj 和 θk 表示 3 个测压孔的来流入射角。 整理(3) 式得到 Γijcos2θk + Γjk cos2θi + Γki cos2θj = 0 (4)
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