关键词: 大气数据系统, 静压源误差, 逐步回归, 计算流体力学, 误差修正

Abstract: Aiming at the static source error of civil aircraft air data system, the correlation between error and main influencing factors is analyzed by stepwise regression analysis, the static source error correction model is studied and an effective error correction scheme is proposed to improve the accuracy of static pressure measurement. B777 aircraft model is taken as an example, the consistency between 3D modeling created by Solidworks and the real machine experiment is verified by computational fluid dynamics(CFD) simulation method. Static pressure measurements under different flight conditions were obtained through simulation and post-processing, and the errors are corrected according to the error correction scheme proposed by the stepwise regression method. The error of the calculated airspeed according to the revised static pressure solution is less than 3%, which meets the requirements of airworthiness clause. The revised scheme has high practical application value, and can provide reference for the design of static pressure source error correction scheme for civil aircraft.

Key words: air data system, static source error, stepwise regression analysis, computational fluid dynamics(CFD), error correction