Astrochronologic calibration of the Shuram carbon isotope excursion with new data from South China
Astrochronologic calibration of the Shuram carbon isotope excursion with new data from South China
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DOI：
10.1016/j.gloplacha.2022.103749
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发表时间：
2022-01
影响因子：
3.9
通讯作者：
Haiyan Li;Shihong Zhang;Jian Han;Tao Zhong;Jikai Ding;Huaichun Wu;Pengju Liu;Jin Dong;Zhifei Zhang;Tianshui Yang;G. Jiang
中科院分区：
文献类型：
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作者：
Haiyan Li;Shihong Zhang;Jian Han;Tao Zhong;Jikai Ding;Huaichun Wu;Pengju Liu;Jin Dong;Zhifei Zhang;Tianshui Yang;G. Jiang
查看视频演示：www.example.com论文介绍了一个基于无源性的输出反馈自适应控制系统，用于使用压电致动器控制弹丸尾翼。尾翼在弹体上的旋转运动由粘贴有压电主动层的柔性悬臂梁控制。 向压电层施加电压引起弹性梁的变形，这又引起翅片的旋转。假设只有鳍的旋转角及其导数被测量用于反馈，而系统的参数或攻角是未知的。利用非方系统的无源化理论， 控制系统推导出的鳍角控制。通过李雅普诺夫分析，证明了鳍角渐近收敛于目标值和节点位移矢量的稳定性。有趣的是，控制律类似于 PID（比例，微分和积分）控制器，但其增益是时变的，并根据自适应方案进行调整。仿真结果跟踪恒定的，正弦的，和bang-bang命令。结果表明，自适应律实现精确的控制鳍的角度，尽管在参数和干扰输入的不确定性。
View Video Presentation: https://doi.org/10.2514/6.2022-0493.vidThis paper presents a-passivity-based output feedback adaptive control system for the control of a projectile fin using a piezoelectric actuator. The rotational motion of the fin on the projectile is controlled by a flexible cantilever beam bonded with a piezoelectric active layer. The application of voltage to the piezoelectric layer causes a deformation in the elastic beam, which in turn, causes rotation of the fin. It is assumed that only the rotational angle of the fin and its derivative are measured for feedback, while the system's parameters or the angle of attack are not known. Using the- passification theory for non-square systems, an adaptive control system is derived for the fin angle control. Through the Lyapunov analysis, the asymptotic converge of the fin angle to its target value and the stability of the nodal displacement vector are established. Interestingly, the control law resembles a PID (proportional, derivative, and integral) controller, but its gains are time-varying and are tuned according to an adaptive scheme. The simulation results are presented for tracking constant, sinusoidal, and bang-bang commands. The results show that the adaptive law accomplishes precise control of the fin angle, despite uncertainties in the parameters and disturbance input.