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| A Level Adjustment Method for Aircraft Without Public Reference Points |
| LIU Huaqiu1, LI Shuanggao1, ZHAI Jianjun1, LI Dong2 |
(1. College of Mechanical and Electronic Engineering, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China;
2. AVIC Hongdu Industry Group Ltd., Nanchang 330024, China) |
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Abstract To solve the high-cost of frequent maintenance of public reference points which are widely used to build
global coordinate system in the digital aircraft level adjustment recently, a novel level adjustment method for aircraft without
public reference points was proposed. The mathematical model of horizontal coordinate system without public reference
points is established, and the horizontal coordinate system is built with the moveable dual-axis inclinometer of high precision
and the mounting base of inclinometer. Based on the horizontal coordinate system, the horizontal posture of aircraft
is calculated, and numerical control positioners are driven to move coordinately to achieve aircraft level adjustment. Then
the test system for the level adjustment of aircraft is developed. Besides that, an application experiment on a certain type
aircraft has been conducted in the assembly plant, which demonstrates that the level adjustment precision of test system is
better than 0.4 mm, and the horizontal coordinate system can provide an accurate adjustment datum for the whole adjustment
process. The method can complete the level adjustment process ideally, and also improve the efficiency and precision
of measurement and adjustment.
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2017, 
