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Double-deck bi-directional loading technology based on airliner cabin floor structure

LIU Wei;TENG Qing;LIU Bing;Aviation Technology Key Laboratory of Full Scale Aircraft Structure Static and Fatigue Test,Aircraft Strength Research Institute of China;Stress Department,Shanghai Aircraft Design and Research Institute;  
The vertical loading method for the structural test of the civil aircraft is investigated.A comparison of three loading schemes(based on the skin tension pads,the monolayer cabin floor structure and the double-deck cabin floor structure)shows that the loading scheme based on the double-deck cabin floor structure is more applicable as it can provide better stress simulation for the frame structure.A double-deck bi-directional loading technology based on the airliner cabin floor structure is then proposed.By developing a loading strategy and related loading device design technique,effective fuselage loading under different test cases with fixed lever ratio loading system is realized.The loading device design is proved to be capable of engineering application as it performed a load error of less than 1%in the full-scale verification test.The technology has successfully improved the quality and efficiency of the airworthiness verification test of a certain aircraft,providing technical references for similar tests.
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