基于压电激励作动器的大型复杂舱壁结构振动主动控制试验研究

Active vibration control tests for large complex bulkhead structure based on piezoelectric actuators

振动主动控制技术是降低结构低频振动的有效方式。针对简单结构,已经开展了大量理论与实验研究。但对于工程中典型的大型复杂舱壁结构,其控制效果及技术可行性仍有待验证。鉴于此,该研究将压电激励作为次级控制作动器,开展大型复杂加筋舱壁结构的振动主动控制实验研究。针对低频线谱激励,系统采用经典的前馈式多通道耦合控制方式。结果表明,对于典型的两个单频激励频点,控制后可获得面板9个监测点处线谱峰值8 dB的平均减振量,验证了该技术用于大型复杂舱壁结构的有效性。由于复杂结构表面振动的不均匀性,各监测点的减振量并不均匀。最优的控制力组合可保证在线谱峰值较大的监测点处获得高的减振量。但是,对于振幅较小的监测点,控制力组合却并非最优,减振量也有限。

Active vibration control technology is an effective way to reduce low-frequency vibration of structures.For simple structures,a large number of theoretical and test studies have been performed.However,for typical large and complex bulkhead structures in engineering projects,active vibration control effect and technical feasibility still need to be verified.Here,piezoelectric excitation was taken as the secondary control actuator to conduct tests and study active vibration control of large and complex stiffened bulkhead structure.For low-frequency line spectrum excitation,the classical feedforward multi-channel coupled control mode was adopted in test system.The results showed that for two typical single-frequency excitation frequency points,the average vibration reduction of 8dB line spectrum peak value at 9 monitoring points on panel can be obtained after control to verify the effectiveness of the proposed technology in large and complex bulkhead structure;due to the non-uniformity of surface vibration of complex structures,vibration reductions of various monitoring points are not uniform;the optimal control force combination can ensure high vibration reduction at monitoring points with larger peak values of online spectrum,but for monitoring points with smaller vibration amplitude,this control force combination is not optimal and their vibration reductions are limited.