某型水陆两栖飞机水面高速滑行振动研究

Study on hydroplaning of a certain amphibious aircraft with high speed

某型水陆两栖飞机在某次试飞过程中的水面高速滑行阶段出现海豚运动和机翼振动的异常现象,针对该现象展开原因分析研究。首先,建立飞机结构动力学有限元模型,研究弹性体飞机的固有动力特性;然后,建立双质量弹簧系统模型,结合水动力学研究飞机在水面滑行的运动特性;最后,结合飞机固有动力特性和水面高速滑行运动特性,分析飞机在水面高速滑行过程中机翼产生异常振动的原因。研究结果表明:飞机着水时因着水姿态以及自身静稳性等因素发生海豚运动;在某个运动时刻,当运动固有频率与机翼的一阶弹性模态频率耦合导致机翼振动。研究结果既为后续研究异常避免措施以及保证滑行试飞安全,提供了理论依据;也为水陆两栖飞机振动设计以及水面高速滑行振动分析提供了一种研究思路。

The abnormal phenomena of porpoising and wing vibration occurred in the high-speed skating stage of a certain amphibious aircraft during a test flight.The causes of this phenomenon were researched.Firstly, a structural dynamic finite element model is established to study the nature dynamic characteristics of the elastic aircraft.Then, the two-mass spring system model is established to study the motion characteristics of aircraft skating on water surface combined with hydrodynamics.Finally, combined with the nature dynamic characteristics of the aircraft and the heave characteristics of high-speed skating on the water surface, the causes of abnormal wing vibration during high-speed skating on the water surface are analyzed.The results show that the porpoising occurs due to the landing attitude and static stability.At a certain moment of motion, when the natural frequency of motion is coupled with the first-order elastic modal frequency of the wing, the wing vibration is caused.The research results not only provide a theoretical basis for the follow-up study of abnormal avoidance measures and ensuring the safety of taxiing flight test.It also provides a research idea for the vibration design of amphibious aircraft and the vibration analysis of high-speed taxiing on the water surface.