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中文摘要：
为了克服压电结构振动同位配置中局部应变和正位移反馈（PPF）算法补偿阻尼比的两面性问题,运用低通滤波器来滤除高频局部应变模态,用速度负反馈混合PPF算法来进一步提高系统的阻尼比,通过劳斯判据分析了改进后算法的稳定性条件.以飞机壁板结构为研究对象,根据激光测振仪识别出其中的两阶模态振型,并粘贴压电片进行振动控制.仿真和实验结果表明,无论是在正弦激励还是随机信号激励下,混合了低通滤波、PPF和速度负反馈（DVFB）的新方法都能较大幅度降低结构的90 Hz和162 Hz模态振幅,并有效抑制单一PPF实验过程中出现的谐波分量,两阶模态同时控制效果都达到10 dB以上.
英文摘要：
In order to overcome the problems resulting from the local strain in the collocated configuration of piezo-electric structure and the compensation damping ratio of the positive position feedback（PPF） algorithm,first,a new method is proposed,which uses a low-pass filter to attenuate the local high-frequency strain mode and employs the direct velocity negative feedback（DVFB） to modify the PPF algorithm for the damping ratio improvement.Next,the conditions for the stability of the improved algorithm are analyzed according to the Royce criterion.Then,by taking a plane panel structure as the objective,an experiment is carried out to verify the proposed method,in which a laser scanning vibrometer is used to identify the shape of the two modes and piezoelectric patches are pasted for vibration control.Simulated and experimental results show that,under either sine or random signal excitation,the method integrating low-pass filtering,PPF and DVFB greatly reduces the mode amplitude at 90 and 162 Hz and effectively suppresses the harmonic component during the single PPF experiment,with a simultaneous control effect of the two modes being up to more than 10 dB.
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