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伸缩机翼作为一种可变形翼,变形过程中,由于其结构时变特性严重且具有柔性体特点,翼面横向振动特性实时变化从而影响飞行性能.基于伸缩机翼实验模型,分别开展了伸缩机翼模态实验研究和振动实验研究,即通过PLC控制系统控制伺服电机转速及转向,进而改变活动机翼外伸长度及伸缩速度,一方面利用锤击法获得五种活动机翼外伸长度下前三阶模态参数;另一方面利用ICP加速度传感器、LMS数据采集分析系统采集并处理活动机翼伸缩过程中横向振动加速度信号,获得伸缩速度与最大振动幅值、最大响应频率之间关系.结果表明,活动机翼外伸长度增加,结构固有频率值减小;伸缩速度作为参数激励,其等效激励与活动机翼某一外伸长度下某一阶固有频率值相近而导致颤振.为伸缩机翼翼面振动控制和伸缩速度合理选择提供理论依据和技术支持.
As a deformable wing, the extensible wing as a deformable wing, due to the serious time-varying characteristics and flexible body characteristics of the deformable wing, affect the flight performance due to the real-time changes of the lateral vibration characteristics of the wing.According to the telescopic wing experimental model, Wing experimental research and vibration experiments, that is, through the PLC control system to control the servo motor speed and steering, and then change the active wing extension and telescopic speed, on the one hand using the hammer method to obtain five activities wing extension length On the other hand using the ICP accelerometer and LMS data acquisition and analysis system to collect and process the lateral vibration acceleration signals during the expansion and contraction of the active wing, and obtain the relationship between the maximum and minimum vibration amplitudes and the maximum response frequency The results show that the extension of the movable wing increases and the natural frequency of the structure decreases, while the expansion and contraction speed as the parameter excitation, the equivalent excitation is similar to the natural frequency of a certain order under some extension of the active wing, resulting in the flutter The theoretical basis and technical support are provided for the reasonable selection of the controllability and retraction speed of the wing plane of retractable wing.