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Evaluation of the Active Plate Vibration Reduction by the Parameter of the Acoustic Field

100%

Brański A., Szela S.

Acta Physica Polonica A

2011

vol. 119

issue 6A

942-945

Effectiveness of the active vibration reduction of triangular plate is evaluated by way of the analysis of acoustical field. The active vibration reduction is performed with actuators. The effect is measured by the analysis of the acoustical field both far distance and near one from the plate. As the control parameter, the difference between acoustical pressures is considered. The first pressure and the second one are radiated by the plate without and with the vibration reduction, respectively. The control parameter is calculated for two reduction cases. First case, when actuators are attached at so-called quasi-optimal places and second one, when they are shifted. The numerical calculations show that the acoustical field is sensitive to change of the plate active vibration reduction. It responds to even little changes of the plate vibrations in both active reduction cases mentioned above. So that it is handy indirect control parameter of the active vibration reduction.

The Idea of the Selection of PZT-Beam Interaction Forces in Active Vibration Protection Problem

81%

Brański A., Borkowski M., Szela S.

issue 1

17-22

The paper concerns an active vibration protection (p-reduction) of the structure. This problem corresponds to the active vibration reduction (a-reduction). The quantity and effectivness of the a-/p- reduction, measured with reduction and effectiveness coefficient respectively, depends on, inter alia, the PZT distribution on the structure subdomains with the largest curvatures (quasi optimal distribution) are considered. The aim of this paper is to determine such interacting forces PZT-structure, assuming QO distribution of PZTs, which maximize the effectiveness of p-reduction. The beam clamped at one end, vibrating separately with first three modes, is chosen as the research object. The interacting forces are searched requiring that the shear force and bending moment at the clamped side are equal to zero. The total p-reduction is achieved for separate modes. Assuming the QO distribution of the PZTs, the best p-effectiveness is achieved. The validation of theoretical considerations is confirmed numerically.

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2 Acta Physica Polonica A

1 2011

1 2010

2 Brański A.

2 Szela S.

1 Borkowski M.

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Evaluation of the Active Plate Vibration Reduction by the Parameter of the Acoustic Field

The Idea of the Selection of PZT-Beam Interaction Forces in Active Vibration Protection Problem