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• W2319327505 abstract "In recent years, the confluence of piezoelectric properties, micro-electro-mechanical principles, and unhindered possibilities of synthesizing new metamaterials via topology optimization has emerged as one of the frontier technology issues. From the viewpoint of the dynamics of adaptive systems, this confluence deals with tailoring of one or combinations of the three fundamental dynamic properties: system frequencies, wave dispersion characteristics, and damping. Research for passive and active damping has been extensively studied(see, e.g., a survey article by Moheimani, Lakes et al. and a recent article by Hussein and Frazier and references therein). Studies on dispersion characterization of elastic and elastic metamaterials may be found in Brillouin, Mead, Aberg and Gudmundson, Mace and Manconi, Hussein, Collet et al., Sohoran et al., among others. When it comes to tailoring system frequencies, prevailing preferred approaches have been topology optimization (see, e.g., Bensoe and Sigmund, Blasques and Stolpe, Andreasen and Sigmund). While stiffness tailoring which leads to frequency tailoring by topology optimization offers a powerful tool to design complex geometries, including acoustic metamaterials, it often neglects to take advantage of active feedback strategies as topology optimization literally focuses on passive structural design. The objective of the present study is to explore a gyro-feedback concept to tailor frequencies which in turn effect wave dispersion characteristics and frequency-dependent damping. Gyro-feedback has been extensively utilized in gait dynamics, especially for robotic motion control as it preserves the system rigid-body motions unlike the conventional PID control. It should be noted that the conversion of feedbackbased frequency tailoring can be realized via equivalent passive structural modifications as shown by Belvin and Park. To this end, Section II illustrates the basic properties of a gyro-feedback system by way of two degree-of-freedom example problem. Generic advantages of gyro-feedback concept over the position feedback is demonstrated as to tailoring the closed loop frequencies. In Section III we employ the continuum Timoshenko beam model to examine both the frequency tailoring capability as well as dispersion characterization via gyro-feedback. It is shown that the introduction of gyro-feedback gain in the Timoshenko beam is equivalent to tailoring the radius of gyration of the beam cross sectional dimensions. In particular, it is shown that a critical choice of gyro-feedback gain results in decoupling of the shear waves from the bending waves, thus achieving non-dispersive characterization. In addition, by introducing homogenization of heterogeneous periodic systems, an equivalent good Boussinesq dispersive beam model is examined in terms of its frequency tailoring ability along with dispersive" @default.
• W2319327505 created "2016-06-24" @default.
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• W2319327505 date "2013-04-05" @default.
• W2319327505 modified "2023-09-23" @default.
• W2319327505 title "A gyro-feedback concept for tailoring the dynamic performance of metamaterial-based adaptive systems" @default.
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• W2319327505 doi "https://doi.org/10.2514/6.2013-1742" @default.
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