Abstract

The paper presents the results of the comparative analysis of the AMDAR measuring system aboard regular airliners and the measuring system of the Yak-42D “Roshydromet” new-generation research aircraft. It is shown that root-mean-square errors of air temperature, wind speed, and wind angle measurements based on the data of the research aircraft for the conditions of horizontal steady flight are 0.3°C, 0.7 m/s, and 0.5°, respectively. These values characterize the ultimate accuracy for the modern aircraft instrumentation. Based on flight tests and computer simulations, the possible sources of errors in the AMDAR system are analyzed: aircraft maneuvers, variations in the air flow over fuselage, and the application of simplified formulas for calculations. It is demonstrated that the errors in the wind speed and wind angle determination in the AMDAR system under aircraft maneuvers with air flow deflection can reach 5 m/s and 30°, respectively. It is proposed to exclude from consideration the AMDAR data obtained during the maneuvers of airliners with roll angles above 10° and to suppose that the error of the AMDAR system in a flight without any roll and turning is 1°C for air temperature, 3 m/s for wind speed, and 5° for wind angle.

中文翻译：

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使用Yak-42D“ Roshydromet”研究飞机数据估算AMDAR系统中温度和风的测量精度

摘要

本文介绍了常规客机上的AMDAR测量系统与Yak-42D“ Roshydromet”新一代研究飞机的测量系统的比较分析结果。根据研究飞机在水平平稳飞行条件下的数据显示，气温，风速和风角测量的均方根误差为0.3°C，0.7 m / s和0.5°，分别。这些值代表了现代飞机仪表的最终精度。基于飞行测试和计算机模拟，分析了AMDAR系统中可能的错误来源：飞机操纵，机身上气流的变化以及简化公式的计算应用。结果表明，在具有空气流偏转的飞机操纵下，AMDAR系统中风速和风角确定的误差分别可以达到5 m / s和30°。建议排除在侧倾角大于10°的客机操纵过程中获得的AMDAR数据，并假设在3 m的空气温度下，无任何侧倾和转向的飞行中AMDAR系统的误差为1°C / s表示风速，5°表示风角。