基于逐步回归分析的民机静压源误差修正

Static source error correction of civil aircraft based on stepwise regression analysis

针对民机大气数据系统的静压源误差问题,使用逐步回归分析获得误差与主要影响因素之间的相关关系,研究静压源误差修正模型,提出有效的误差修正方案,用以提高静压测量准确度;以B777机型为例,使用计算流体力学(CFD,computational fluid dynamics)仿真方法验证了Solidworks所建三维模型与真机实验的一致性,通过仿真与处理后得到不同飞行状态下的静压测量值,根据逐步回归分析所提出的误差修正方案对测量值进行误差修正。结果表明:逐步回归分析的修正方案能够有效修正误差,修正结果稳定;修正后的静压解算空速误差小于3%,符合适航条款要求。该修正方案具有较高的实用价值,可为民机静压源误差修正方案设计提供参考。

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.