引用本文: 王鹏, 金鑫, 张卫民. 钝头机体用嵌入式大气数据传感系统的解算精度研究[J]. 力学与实践, 2016, 38(3): 255-261.
WANG Peng, JIN Xin, ZHANG Weimin. RESEARCH ON THE SOLVING ACCURACY FOR THE FADS SYSTEM APPLIED TO THE VEHICLE WITH BLUNT FORE-BODIES[J]. MECHANICS IN ENGINEERING, 2016, 38(3): 255-261.
 Citation: WANG Peng, JIN Xin, ZHANG Weimin. RESEARCH ON THE SOLVING ACCURACY FOR THE FADS SYSTEM APPLIED TO THE VEHICLE WITH BLUNT FORE-BODIES[J]. MECHANICS IN ENGINEERING, 2016, 38(3): 255-261.

## RESEARCH ON THE SOLVING ACCURACY FOR THE FADS SYSTEM APPLIED TO THE VEHICLE WITH BLUNT FORE-BODIES

• 摘要: 针对一种钝头机体用嵌入式大气数据传感(flush air data sensing,FADS) 系统的实施方案及求解精度展开研究. 基于15° 钝头体外形,在马赫数Ma = 2.04, 3.02, 5.01,攻角α 介于-5°和25°之间,不考虑侧滑角的情况下,采用势流理论及修正的牛顿流理论建立了该FADS 系统的气动模型. 首先利用经典的三点式算法建立了攻角的求解方案,并采用最小二乘曲线拟合的方法对误差进行了修正;随后建立相应的迭代衰减算法解算静压及动压,最后根据压力比与马赫数的关系求解马赫数. 对解算的数据与实际飞行参数进行了比较,结果表明,建立的钝头机体用FADS 系统的模型及算法精度较好,攻角绝对误差小于0.1°,静压相对误差小于5%,马赫数绝对误差小于0.01.

Abstract: This paper studies the implementation and the accuracy of the FADS (flush air data sensing) system applied to the vehicle with blunt fore-bodies. For the 15° blunt fore-bodies at Mach number Ma = 2.04, 3.02, 5.01, angle of attack α is between -5° and 25°, and without the consideration of the angle of sideslip, the FADS model is a compromise between a simple potential flow model and the modified Newtonian flow theory. In this paper, the algorithm for the angle of attack based on the triple algorithm is developed, and the calibration error for the angle of attack is determined by the least-squares curve fitting. The free stream pressure and the dynamic pressure can then be determined by an iteration algorithm. Finally, the Mach number can be computed by using the normal one-dimensional fluid mechanics relationships. Systematic comparisons are conducted and it is shown that the model is reliable and the accuracy is high for the FADS system. The error for the angle of attack is less than 0.1°, the error for the free stream pressure is less than 5%, and the error for the Mach number is less than 0.01.

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