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A lattice sandwich structure with the active variable stiffness device under aerodynamical condition

机译：在空气动力学条件下具有活性可变刚度装置的格子夹层结构

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Herein, a novel pyramid lattice sandwich structure with the active variable stiffness (AVS) is proposed, which consists of a proportion integration (PI) active controller, a piezoelectric actuator, and a variable stiffness device. The principle of AVS is to process the real-time vibration feedback signal of the lattice sandwich beam by using the PI controller and the piezoelectric actuator to change structural stiffness continuously. The structure has excellent self-adjusting and active vibration reduction effect. Based on the supersonic piston theory, Hamilton's principle, and the assumed modes method, the dynamics equations of the whole structure are established. The vibration reduction and energy dissipation of lattice sandwich beams with AVS and without AVS are analyzed by using the Runge-Kutta algorithm. Moreover, the relevant parameters of PI controller, positive stiffness, negative stiffness, incoming flow velocity, damping coefficient, and installation position are compared and analyzed, respectively. The results indicate that the novel lattice sandwich structure with AVS can achieve ideal vibration reduction effect, and the efficiency can be improved by adjusting the parameters appropriately. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：这里，提出了一种具有活性可变刚度（AVS）的新型金字塔晶格夹层结构，其包括比例集成（PI）有源控制器，压电致动器和可变刚度装置。 AVS的原理是通过使用PI控制器和压电致动器来处理格子夹层光束的实时振动反馈信号，以连续地改变结构刚度。该结构具有优异的自调节和有源减振效果。基于超音速活塞理论，汉密尔顿原理和假设模式方法，建立了整个结构的动力学方程。通过使用径流-Kutta算法分析与AVS和没有AVS的晶格夹层梁的减振和能量耗散。此外，比较和分析了PI控制器，正刚度，负刚度，进入的流速，阻尼系数和安装位置的相关参数。结果表明，具有AVS的新型晶格夹层结构可以实现理想的减振效果，并且可以通过适当调节参数来提高效率。 （c）2021 Elsevier Masson SAS。版权所有。

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