Independent modal variable structure fuzzy active vibration control of thin plates laminated with photostrictive actuators
Independent modal variable structure fuzzy active vibration control of thin plates laminated with photostrictive actuators
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DOI：
10.1016/j.cja.2013.02.012
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发表时间：
2013-04
影响因子：
5.7
通讯作者：
R. He;S. Zheng
中科院分区：
文献类型：
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作者：
R. He;S. Zheng
光致伸缩驱动器在紫外光照射下可产生光变形应变。可实现弹性板结构的非接触式微驱动和振动控制。考虑到光致伸缩作动器的开关驱动和非线性动态特性，提出了一种变结构模糊主动控制方案来控制光致伸缩作动器的光强。首先，基于模态分析技术建立了光电层合板的独立模态振动控制方程。然后，推导出最优的光开关函数以增大滑动模态面积范围，并设计了光强自调节模糊主动控制器。同时，用连续函数代替符号函数来减小变结构控制的抖振。最后进行了数值仿真，仿真结果表明所提出的控制策略比速度反馈控制对板的作动和控制具有更好的性能和控制效果，并能有效地抑制振动。
Photostrictive actuators can produce photodeformation strains under illumination of ultraviolet lights. They can realize non-contact micro-actuation and vibration control for elastic plate structures. Considering the switching actuation and nonlinear dynamic characteristics of photostrictive actuators, a variable structure fuzzy active control scheme is presented to control the light intensity applied to the actuators. Firstly, independent modal vibration control equations of photoelectric laminated plates are established based on modal analysis techniques. Then, the optimal light switching function is derived to increase the range of sliding modal area, and the light intensity self-adjusting fuzzy active controller is designed. Meanwhile, a continuous function is applied to replace a sign function to reduce the variable structure control (VSC) chattering. Finally, numerical simulation is carried out, and simulation results indicate that the proposed control strategy provides better performance and control effect to plate actuation and control than velocity feedback control, and suppresses vibration effectively.