A Method for Calculating Angle of Attack and Sideslip Angle

Abstract

The airframe of amphibious aircraft is complex,and it is difficult to eliminate the influence of sideslip angle by using single angle of attack sensor. The wind tunnel test is carried out on the front fuselage model of a large amphibious aircraft,according to the characteristics of the angle of attack sensors on both sides of the fuselage affected by the sideslip angle. The angle of attack sensor is installed in symmetrical position on both sides of the fuselage. The change of the measurement value of the angle of attack sensor on the left and right sides with the angle of attack and sideslip angle of the model is studied. According to the mean and difference of the measured values on the left and right sides,the flight angle of attack and sideslip angle are obtained by inverse calculation,and the calculation scheme of the angle of attack and sideslip angle is verified by flight test. The results show that the angle of attack sensor installed on both sides of the fuselage can eliminate the influence of sideslip angle,and thus obtain accurate angle of attack signal. The sideslip angle can also be calculated according to the difference between the left and right angles of attack. It is feasible to use the angle of attack sensors on the left and right sides of the fuselage to calculate the flight angle of attack and sideslip angle.

Keywords

• amphibious aircraft
• angle of attack sensor
• sideslip angle
• calculate method
• flight test