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Smart Structures and Systems Volume 24, Number 1, July 2019, pages 27-35 DOI: https://doi.org/10.12989/sss.2019.24.1.027 |
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Optimum actuator placement for damping of vibrations using the Prestress–Accumulation Release control approach |
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Blazej Poplawski, Grzegorz Miku
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| Abstract | ||
| This paper proposes a quantitative criterion for optimization of actuator placement for the Prestress–Accumulation Release (PAR) strategy of mitigation of vibrations. The PAR strategy is a recently developed semi-active control approach that relies on controlled redistribution of vibration energy into high-order modes, which are high-frequency and thus effectively dissipated by means of the natural mechanisms of material damping. The energy transfer is achieved by a controlled temporary removal of selected structural constraints. This paper considers a short-time decoupling of rotational degrees of freedom in a frame node so that the bending moments temporarily cease to be transferred between the involved beams. We propose and test a quantitative criterion for placement of such actuators. The criterion is based on local modal strain energy that can be released into high-order modes. The numerical time complexity is linear with respect to the number of actuators and potential placements, which facilitates quick analysis in case of large structures. | ||
| Key Words | ||
| semi-active control; damping of vibrations; actuator placement; smart structures; Prestress–Accumulation Release (PAR) | ||
| Address | ||
| Blazej Poplawski, Grzegorz Mikutowski, Dominik Pisarski, Rafat Wiszowaty and Lukasz Jankowski: Institute of Fundamental Technological Research, Polish Academy of Sciences, ul. Pawińskiego 5B, 02-106 Warsaw, Poland | ||