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| Application of improved genetic algorithms for pizoelectric element placement of active flexible structures |
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| DOI：10.7511/jslx20084104 |
| KeyWord:piezoelectric elements,optimal design,genetic algorithm,ANSYS software |
| GAO Rui-zhen ZHANG Jing-jun ZHENG Ji WANG Er-cheng |
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| Abstract: |
| In order to suppress undesired vibration effectively,the paper proposed an optimal method based on the improved genetic algorithms and D-optimal design principle.This principle can be simplified to determine the probable placement of piezoelectric elements only based on mode shapes of structure.Through the study of modal shapes and dynamic characteristics of structure,a simplified method is employed to convert low order mode shapes selected from all structural modes into normalization.Generally,piezoelectric elements should be placed on the surfaces where modal strain is maximal so as to achieve the best control efficiency.But when piezoelectric elements are patched on the surfaces,the structures have different mode shapes.Therefore,the paper realizes the interface between ANSYS software and genetic algorithms.In this way,ANSYS software can iteratively analyze flexible structure boned piezoelectric elements and provide all mode shapes for the optimization,and genetic algorithms optimize the placement of piezoelectric elements repeatedly until finding the optimal locations.At last,a case shows the efficiency and feasible of the method. |
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