A Modeling Method of Aircraft Angle of Attack Signal

Abstract

The invention discloses an aircraft attack angle signal modeling method including a signal flow model of an aircraft attack angle and mathematic models of links in a signal flow. The signal flow model describes the physical process and processing links from the aircraft real attack angle to the flight control using the attack angle signals, including the influence of aircraft pitching and rotation to the attack angle, influence of aircraft flow field disturbance to attack angle measurement, the dynamic response of an attack angle sensor, the sensor signal measurement conversion, the input signal smooth filtering, the sensor position error correction, the output signal smooth filtering, and the transmission delay in each link. The mathematic model of each link gives the typical mathematic model of each link in the signal flow and can mathematically describe and simulate the physical process and signal processing of each link. The modeling method realizes the high precision simulation of the aircraft attack angle signal, improves the efficiency and credibility of the flight control algorithm design, and has high application value in the aviation and aerospace industry.

Description

technical field [0001] The invention belongs to the technical field of flight control, and relates to a modeling method capable of realizing high-precision simulation of aircraft angle-of-attack signals. Background technique [0002] The angle of attack, that is, the angle of attack, is the angle between the longitudinal axis of the aircraft body and the airspeed direction. The angle of attack directly determines the lift, pitch / roll / yaw stability, and three-axis control performance of the aircraft. If the angle of attack is too large, the aircraft may stall and lose control. Therefore, in flight control, the angle of attack is one of the most important signals, which is not only used to enhance the stability of the aircraft, but also used for safety-critical functions such as stall warning and angle-of-attack protection. The high-precision simulation of the angle-of-attack signal is the basis for realizing the above functions in the flight control design. [0003] At pres...

AI Technical Summary

Problems solved by technology

However, with the improvement of the performance and the complexity of functions of modern air data computers, there are more and more complicated steps for filtering and calculating the angle of attack signal in the air data computer. The design accuracy of relevant functions in flight control reduces design efficiency; in serious cases, it even leads to a decrease in system stability and affects flight safety

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