A rudder surface priority adjustment method to improve the stealth performance of fixed-wing aircraft

A fixed-wing, high-performance technology, applied in the field of flight control, can solve problems such as strong dependence, inconvenience, and weak operability, and achieve the effects of strong purpose, improved directivity, and guaranteed safety

Active Publication Date: 2019-05-17
AIR FORCE UNIV PLA
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AI Technical Summary

Problems solved by technology

The selection of the weight matrix has a great influence on the distribution results of the weighted pseudo-inverse method. However, the selection of weight parameters depends on the experience of experts in engineering. The dependence is strong, the operability is weak, and the control effect is not good. This brings serious problems to engineering applications. it's a big inconvenience

Method used

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  • A rudder surface priority adjustment method to improve the stealth performance of fixed-wing aircraft
  • A rudder surface priority adjustment method to improve the stealth performance of fixed-wing aircraft
  • A rudder surface priority adjustment method to improve the stealth performance of fixed-wing aircraft

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specific Embodiment

[0087] Step 1: Taking a stealth aircraft with multiple control surfaces as an example, see the attached figure 2 , establish a control allocation model such as formula (1), where the control quantity u=[u le ,u re ,u pf ,u la ,u ra ,u pt ,u yt ] T , represent the left elevon, right elevon, pitch flap, left full-motion wingtip, right full-motion wingtip, pitch thrust vector, and yaw thrust vector of the aircraft; the corresponding position constraints and rate constraints are:

[0088] u max =-u min =[30 30 30 60 60 10.61 10.61] T ,

[0089] ρ max =-ρ min =[150 150 50 150 150 60 60] T .

[0090] Under the flight conditions of Mach number 0.4 and altitude 15000ft, select the virtual control command denote the roll, pitch and yaw angular accelerations respectively, and the corresponding system matrix and control surface control effectiveness matrix are respectively:

[0091]

[0092]

[0093] According to the control surface deflection position constraints...

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Abstract

The invention relates to a rudder surface priority adjustment method for improving the stealth performance of a fixed-wing aircraft. 1. Establishing a control distribution model of a multi-control surface stealth aircraft based on a weighted pseudo-inverse method; 2. Define an efficiency matrix and its remaining efficiency matrix for use in Subsequent parameter adjustment; 3. Design weight parameter adjustment rules; 4. According to the parameter adjustment rules in the third step, determine the selection of different parameter adjustment rules by judging the row rank of the remaining performance matrix, and adjust the weight parameters; 5. , According to the stealth characteristics, establish the corresponding performance index, and evaluate the control performance of the multi-control surface stealth aircraft after parameter adjustment, so as to guide the parameter adjustment. If the performance index is met, the parameter adjustment is stopped; if the requirement is not met, the above steps are continued until the established goal is reached. The method is simple, scientific and reasonable, and can solve technical problems such as blind parameter adjustment and strong dependence on expert experience in the control allocation of multi-control surface aircraft.

Description

technical field [0001] The invention belongs to the field of flight control and relates to a rudder surface priority adjustment method for improving the stealth performance of a fixed-wing aircraft. Background technique [0002] The traditional layout aircraft uses the elevator, aileron and rudder to control the pitch, roll and yaw movement of the aircraft respectively, and its safety and reliability need to be further improved. With the development of modern aircraft design concepts, innovative airfoils emerge in an endless stream, such as the flying wing aircraft with no horizontal tail and no vertical tail layout, which gets rid of the disadvantages brought by the conventional layout and has outstanding stealth capabilities; such as the US B-2 Flying wing stealth long-range strategic bomber, the radar reflection surface is only 0.1m 2 , is difficult to detect by radar. In order to make up for the lack of longitudinal and directional control performance caused by no tail...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D1/08
CPCG05D1/0808
Inventor 陈勇董新民刘棕成李洪波支健辉
Owner AIR FORCE UNIV PLA
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