Smart Structures and Systems

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Optimum actuator placement for damping of vibrations using the Prestress-Accumulation Release control approach

  • Poplawski, Blazej (Institute of Fundamental Technological Research, Polish Academy of Sciences) ;
  • Mikulowski, Grzegorz (Institute of Fundamental Technological Research, Polish Academy of Sciences) ;
  • Pisarski, Dominik (Institute of Fundamental Technological Research, Polish Academy of Sciences) ;
  • Wiszowaty, Rafal (Institute of Fundamental Technological Research, Polish Academy of Sciences) ;
  • Jankowski, Lukasz (Institute of Fundamental Technological Research, Polish Academy of Sciences)
  • Received : 2018.10.09
  • Accepted : 2019.03.04
  • Published : 2019.07.25
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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.

Keywords

Acknowledgement

Supported by : National Science Centre, Poland

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