상대 변위량을 배제한 KUH 전기체 정하중시험 변위 데이터 분석 방법 연구
KUH full-scale airframe static test restraint system displacement transducer relative displacement rigid body motion;
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The purpose of full-scale airframe static test, which is carried out essentially in aircraft development program, is to prove the static strength requirements and verify the finite element model of structure. For the test, sensors such as strain gage and displacement transducer are attached on test article, and measured data is recorded and compared to predicted data. The displacement transducer is used to measure structural stiffness, and is used to monitor the displacement of the test article so as to keep the location of the test article from loading equipment. The real displacement data measured in the test is a little different from the predicted displacement data, because of the rigid body motion of the test article. The test article is supported by the restraint system. Since the restraint system adopts spring link type, the rigid body motion is occurred, and it affects the displacement data. In this thesis, the analysis method of displacement data resulting from KUH full-scale airframe static test is studied. As the method of obtaining more accurate displacement data, it is studied to remove influence of rigid body motion of each part of the test article, and theory of the relative displacement is used. First, the relative coordinate system transforming the displacement value of the location of the restraint system to zero is set. Then the relative displacement is figured out, compared to predicted data, and verified the validity. It might be utilized as an important data in KUH development program. The displacement analysis method obtaining accurate displacement data by removing influence of rigid body motion will be widely utilized as a structural test data not only on KUH full-scale airframe static test but in most of structural tests.