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• W765271492 abstract "This work discusses the use of piezoelectric materials, more specifically, Polyvinylidene Fluoride (PVDF) and Lead Zirconate Titanate (PZT) for experimental modal analysis (EMA) of mechanical structures. Piezoelectric materials also called smart materials have becoming a consolidated new technology that shows a large potential of application for different engineering areas. These materials exhibit a multi physics domain field coupling like mechanical and electrical coupling domains, thermal and magnetic coupling and etc. The electro-mechanical coupling domains of the material produces an electric displacement when the material is subject to a mechanical stress (direct-effect) and a mechanical strain when the material is submitted to an electric field (inverse effect). So, mainly due to these effects, the use in the experimental modal analysis field appears to be an interesting issue to be investigated. The incorporation of this new technology in the structural tests might aggregate new acknowledgments and advances in the well consolidated input-output based modal analysis techniques as well as in the more recent output only-based modal analysis. This work aims to present some contribution in this area by using piezoelectric sensors, instead of the conventional ones like accelerometers for modal analysis of mechanical structures. The theoretical concepts and background for the developing of the work are presented and discussed, it is also presented the modal analysis of a beam like structure using conventional sensors/actuators and piezoelectric materials. The modal analysis tests of the beam are conducted using different kinds of sensors/actuator and they give some insight of the difference of the estimated modes shapes by using piezoelectric materials. It is also presented a formulation that shows the relation between the displacement mode shapes and de slope difference modal shapes obtained with piezoelectric materials and, finally, it is presented the comparison of the results obtained for the different techniques. The analyses tests showed that the results obtained by using PVDF sensors are similar to the ones obtained by using conventional sensors when the interest is the natural frequencies of the model. The modes shapes estimated by using PVDF sensor also agree with those modes obtained by the theoretical formulation and by the experimental tests using conventional sensors. This makes the use of piezoelectric materials an alternative to the modal analysis using conventional sensor like accelerometers. It also opens a possibility to use this kind of materials, with some advantage, in the output only-based modal analysis and the operational modal analysis (OMA). However, some additional evaluation tests are still necessary not only with lab-structures but also with real structures." @default.
• W765271492 created "2016-06-24" @default.
• W765271492 creator A5044302839 @default.
• W765271492 date "2011-09-26" @default.
• W765271492 modified "2023-09-24" @default.
• W765271492 title "Análise modal de uma estrutura do tipo viga utilizando materiais piezelétricos (PVDF) como sensores" @default.
• W765271492 hasPublicationYear "2011" @default.
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