Method of measuring aircraft actual attack angle value in wind tunnel experiment

Abstract

The invention discloses a method of measuring an aircraft actual attack angle value in a wind tunnel experiment, comprising: collecting a zero point voltage value and other attack angle voltage value corresponding to the zero DEG attack angle value and the non-zero DEG attack angle value of a platform installed on an attack angle mechanism; subtracting the zero point voltage value from the attack angle voltage value corresponding to each non-zero DEG attack angle value to obtain a plurality of adjusted attack angle voltage values; utilizing the adjusted attack angle voltage values and attack angle values to establish a base curve; adjusting the attack angle of an aircraft to be measured to be zero DEG, and obtaining the curve between the actual attack angle value of the aircraft to be measured and an attack angle voltage value according to the preset angle of the aircraft to be measured and the base curve; and according to the measured attack angle voltage value and the curve between the actual attack angle value and the attack angle voltage value, obtaining the actual attack angle value of the aircraft to be measured. The method can substantially reduce operation personnel workload, improve work efficiency, reduce an error rate, enhance the program applicability to different models, and obtain a model preset angle through program calculation.

Description

technical field [0001] The invention relates to a method for measuring the actual attack angle value of an aircraft in a wind tunnel experiment. Background technique [0002] In the wind tunnel test, the precise control of the attitude angle of the model is the guarantee for the smooth progress of the test, and the most important and basic control quantity in the attitude angle of the model is the angle of attack of the model. The angle of attack is also called the angle of attack of the model, which is the angle between the model facing the incoming flow and the incoming flow. The angle of attack control of the model needs to meet high precision, generally speaking, it must be within ±3°. The attitude angle of the model is mainly controlled by the angle of attack mechanism, which is driven by a driving device (such as a motor) to drive the change of the angle of attack of the model in the flow field. In the process of controlling the angle of attack, there are many factor...

AI Technical Summary

Problems solved by technology

Disadvantages of this method: 1. If a new type of elbow joint is added, the pre-installation angle will be different. At this time, it is necessary to re-measure the angle-of-attack voltage data and fit a new angle-of-attack voltage curve; 2. This method cannot effectively eliminate Due to the small error of the angle of attack caused by the different weight of the model, the angle can only be roughly classified for different bent joints and angled struts; 3. This method is time-consuming ...

Images