机载大气数据系统静压源误差修正方法研究

Correction Method for Static Source Error of Airborne Air Data System

针对机载大气数据系统静压源误差问题,分析静压源误差的各影响因素,提出静压源误差的修正方案,以提高大气静压测量值的精度,进一步确保飞机飞行安全。以波音757机型为例,分析了静压源误差主要影响因素及其影响规律,用Solid Works软件进行飞机三维几何建模,GAMBIT软件划分计算域网格,FLUENT软件模拟飞机飞行环境仿真得到不同迎角和马赫数下的静压源误差值,并采用曲面响应法计算得到飞机静压源误差回归模型,根据模型对静压源误差进行了修正。经仿真结果与实际对比验证,该套修正方案具有很好的修正效果,能快速、准确的得到大气真实静压。采用计算流体力学(CFD)仿真方法分析飞机空气动力特性,简单方便、研究周期短、精度高、耗费成本低,有较高的研究和实际应用价值。

For static source error of airborne air data system, this paper analysis the factors which cause the static source error, and proposes a correction scheme for static source error to improve the measurement accuracy of static pressure and further ensure flight sMe- ty. Boeing 757 as an object, this paper analyzes static source error and its effective factor, uses SolidWorks software to construct the air- craft＇s 3D geometric model, GAMBIT software to divide the computational mesh, and FLUENT software to simulate the external flow field, then gets static source error at different angles of attack and Mach numbers, and uses response surface method to get the regres- sion model of static source error, uses the model to correct the error. Comparing the simulation results with the real situation, it is proved that this method has good correction effect. It can get the true static pressure of the atmosphere quickly. And using CFD simula- tion method to analyze the aircraft aerodynamic characteristics is simple and convenient, development cycle short, simulation accuracy high, consuming low cost. The method has high research and practical application value.