Aircraft takeoff tail rubbing risk prediction method and system based on stepwise regression

Abstract

The invention discloses an aircraft takeoff tail rubbing risk prediction method and system based on stepwise regression. The accuracy of risk prediction of a tail rubbing event in the takeoff processof an aircraft is improved. According to the technical scheme, on one hand, a new measurement value of the tail ground clearance is adopted to measure the risk of tail rubbing, and compared with a traditional method, the method is more visual and accurate; on one hand, closely related significance variables are found based on analysis of correlation between a tail wiping event and all parameters;on the other hand, a takeoff and tail rubbing risk prediction model based on a stepwise regression technology is established on the basis of the significance variables; and finally, a new system is developed based on the model, and the automatic output of the machine tail scratching risk prediction result is achieved by inputting required parameters into the system.

Description

technical field [0001] The invention relates to a risk prediction technology for tail strike during aircraft takeoff, in particular to a method and system for establishing a risk prediction model for tail strike during takeoff based on stepwise regression and performing risk prediction based on the model. Background technique [0002] As a type of unsafe incident that occurs frequently during takeoff and landing, tail strikes are unlikely to directly cause major accidents involving aircraft crashes and fatalities, but they will cause structural damage to the aircraft and have a negative impact on subsequent flight safety. hidden dangers and expensive repairs. [0003] Through the analysis of the safety data statistics of domestic and foreign airlines in the past ten years, the tail strike incidents accounted for the highest proportion of serious incidents caused by style and skills, with a total of 33 incidents, accounting for 35%. Compared with landing tail rubbing, takeof...

AI Technical Summary

Problems solved by technology

[0005] 1. The sampling frequency of QAR data acquisition equipment is not exactly the same for different parameters. For example, the sampling frequency of air-to-ground switch, radio radar altimeter and pitch angle are 2HZ, 4HZ, and 8HZ respectively. Therefore, when capturing the real pitch of the aircraft at the moment of departure There will be a certain error in the angle

[0006] 2. After the main wheel of the aircraft leaves the ground, the possibility of the tail strike event will continue to be triggered as the pitch angle further increases, so it is impossible to capture the tail strike event after the main wheel leaves the ground

[0008] Researchers and flight experts have deduced the cause of the tail strike based on aerodynamic theory and flight experience, however, it is still difficult to determine the specific cause of the tail strike

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