Design of novel active constrained layer damping treatments

Date

2024-7-12

Author

Erol, Fulya

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Novel damping treatments are designed to unite the passive damping performance enhancing effect of the slotted stand-off layer added to a passive constrained layer damping treatment and that of the piezoelectric actuator of an active constrained layer damping treatment. In the novel damping treatments, the main aim is to enhance through piezoelectric actuation the passive damping supplied by both the viscoelastic layer and the slotted stand-off layer made of a relatively stiff viscoelastic material with a considerable internal damping through not only enhanced shear deformations but also induced bending and extensional deformations in both layers. To investigate and compare the behavior and performance of all the designed novel damping treatments when the piezoelectric actuators are inactive and when activated, static structural analyses are conducted in ANSYS Workbench with piezoelectricity, so that results are obtained in a much faster way. With the static structural analyses results, it is possible to estimate the passive loss factors of the damping treatment system using the strain energies stored in the components of the damping treatment system statically. Additionally, co-simulation is achieved to be performed between harmonic analysis with piezoelectricity in ANSYS Workbench and feedback controller created as script in MATLAB to investigate the dynamic behavior and performance of a chosen novel damping treatment. Proportional control is selected as the feedback controller since piezoelectric actuation mainly aims at enhancing the passive damping performance in the designed novel damping treatments, and it is stated in the literature that passive damping performance of an active constrained layer damping treatment is enhanced by piezoelectric actuation when proportional control is implemented. Passive loss factors of the chosen novel damping treatment system estimated from harmonic analysis results when the piezoelectric actuators are inactive and from co-simulation results when the piezoelectric actuators are activated are compared with those estimated from static structural analyses results. According to static structural analyses results, none of the designed novel damping treatments display promising passive damping performances. Yet, according to co-simulation results, actual passive damping performance of the chosen novel damping treatment is revealed to be promising. Therefore, co-simulations should be performed for all the designed novel damping treatments to investigate their actual passive damping performances.

Subject Keywords

Active constrained layer damping, Stand-off layer, Piezoelectricity in ANSYS Workbench, Co-simulation between ANSYS Workbench and MATLAB, Noliac piezoelectric actuators, Prony shear relaxation parameters for ISD112 and DYAD606

URI

https://hdl.handle.net/11511/110641

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Graduate School of Natural and Applied Sciences, Thesis