摘要
校准试验是应变电桥法测量飞行载荷的关键环节。为模拟真实飞行时气动载荷压心随飞机机动而连续变化的特性,提出一种可变压心的载荷校准试验方法,对全机平衡和约束载荷进行计算分析,利用多点协调加载系统应用于某型飞机的机翼载荷校准试验。使用变压心加载工况对载荷模型进行验证,明确压心变化引起的误差,通过调整建模工况的压心分布对模型进行优化,机翼根剖面弯矩载荷模型适用范围为17%~90%,模型精度由5.54%提高到2.36%。优化后的载荷模型测得的纵向机动飞行载荷左、右机翼对称,压心变化在验证范围内,测量结果合理可靠。
Calibration test is the key segment of flight load measurement by strain bridge method.In order to simulate the characteristics of aerodynamic load pressure center continuously changing with aircraft maneuvering in real flight,a load calibration test method with variable pressure center is proposed.The force balance and constraint loads of the whole aircraft are calculated and analyzed,and the multi-point coordinated loading system is applied to the wing load calibration test of an aircraft.The load model is verified by the variable pressure center loading condition,and the error caused by the pressure center change is clear.The model is optimized by adjusting the pressure center distribution of the modeling condition,and the accuracy and application scope of the load model are improved.The results show that the left wing and right wing of the longitudinal maneuvering flight load measured by the optimized load model are symmetrical,and the change of pressure center is within the verification range,so the measurement results are reasonable and reliable.
作者
吴波
李文龙
孟敏
WU Bo;LI Wenlong;MENG Min(Chinese Flight Test Establishment,Xi’an 710089,China)
出处
《空军工程大学学报》
CSCD
北大核心
2023年第4期8-13,共6页
Journal of Air Force Engineering University
关键词
飞行载荷
地面试验
变压心
应变电桥法
flight load
ground test
variable pressure center
strain bridge method
