On the Force Drop Off Phenomenon in Shaker Testing in Experimental Modal Analysis
The Electrodynamic Vibration Exciter (shakers) has been one of the most employed excitation sources in modal tests. The shaker is an electromechanical device that provides a mechanical motion due to the input signal sent to its coil. Despite being widely used, it is well known that the shaker intera...
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| Format: | Article |
| Language: | English |
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Wiley
2002-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2002/675674 |
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| author | Paulo Sergio Varoto Leopoldo Pisanelli Rodrigues de Oliveira |
| author_facet | Paulo Sergio Varoto Leopoldo Pisanelli Rodrigues de Oliveira |
| author_sort | Paulo Sergio Varoto |
| collection | DOAJ |
| description | The Electrodynamic Vibration Exciter (shakers) has been one of the most employed excitation sources in modal tests. The shaker is an electromechanical device that provides a mechanical motion due to the input signal sent to its coil. Despite being widely used, it is well known that the shaker interacts with the structure under test. In particular, when the structure passes through a given resonance, the force delivered by the shaker abruptly decreases, causing the so called drop off phenomenon. This paper aims to study this force drop off phenomenon in the single shaker modal testing. Analytical models are developed to help in understanding the physical principles involved in the interaction between the shaker and the structure under test. Experimental analyses are performed using different shakers as well as excitation signals, in order to evaluate the effects of the input signal, as well as the power amplifier operational modes, on the structure dynamics. Preliminary tests revealed that significant distortions might occur during vibration tests using shakers and these distortions significantly affect the determination of the structure response. |
| format | Article |
| id | doaj-art-6e7e8c614e0e47fa95db6dceb1d34264 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2002-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-6e7e8c614e0e47fa95db6dceb1d342642025-02-03T01:12:17ZengWileyShock and Vibration1070-96221875-92032002-01-0194-516517510.1155/2002/675674On the Force Drop Off Phenomenon in Shaker Testing in Experimental Modal AnalysisPaulo Sergio Varoto0Leopoldo Pisanelli Rodrigues de Oliveira1Dynamics Laboratory, Mechanical Engineering Department, School of Engineering of Sao Carlos, University of Sao Paulo, BrazilDynamics Laboratory, Mechanical Engineering Department, School of Engineering of Sao Carlos, University of Sao Paulo, BrazilThe Electrodynamic Vibration Exciter (shakers) has been one of the most employed excitation sources in modal tests. The shaker is an electromechanical device that provides a mechanical motion due to the input signal sent to its coil. Despite being widely used, it is well known that the shaker interacts with the structure under test. In particular, when the structure passes through a given resonance, the force delivered by the shaker abruptly decreases, causing the so called drop off phenomenon. This paper aims to study this force drop off phenomenon in the single shaker modal testing. Analytical models are developed to help in understanding the physical principles involved in the interaction between the shaker and the structure under test. Experimental analyses are performed using different shakers as well as excitation signals, in order to evaluate the effects of the input signal, as well as the power amplifier operational modes, on the structure dynamics. Preliminary tests revealed that significant distortions might occur during vibration tests using shakers and these distortions significantly affect the determination of the structure response.http://dx.doi.org/10.1155/2002/675674 |
| spellingShingle | Paulo Sergio Varoto Leopoldo Pisanelli Rodrigues de Oliveira On the Force Drop Off Phenomenon in Shaker Testing in Experimental Modal Analysis Shock and Vibration |
| title | On the Force Drop Off Phenomenon in Shaker Testing in Experimental Modal Analysis |
| title_full | On the Force Drop Off Phenomenon in Shaker Testing in Experimental Modal Analysis |
| title_fullStr | On the Force Drop Off Phenomenon in Shaker Testing in Experimental Modal Analysis |
| title_full_unstemmed | On the Force Drop Off Phenomenon in Shaker Testing in Experimental Modal Analysis |
| title_short | On the Force Drop Off Phenomenon in Shaker Testing in Experimental Modal Analysis |
| title_sort | on the force drop off phenomenon in shaker testing in experimental modal analysis |
| url | http://dx.doi.org/10.1155/2002/675674 |
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