Abstract
Due to the difficulty of direct measurement of forces transmitted between structures in-situ, they are normally estimated indirectly from measured structural responses and it involves an inversion process. The inverse problems are often ill-posed due to numerical ill-conditioning that the solution is very sensitive to the errors or noise from the measurements. Accelerometer has been widely used for force identification, but the reliability is often in doubt especially at low frequencies. In the present study, strain sensor has been used for force identification as a comparison to accelerometer with application to an engineering sandwich shell structure that is commonly used for railway and automotive car bodies. The transmitted forces between two panels have been identified using both types of sensors. It is shown that the strain sensors give better results than accelerometers especially at low frequencies. This improvement can be regarded as a 'physical conditioning' by using strain sensor and the improvement is identified as a result of a better conditioned frequency response function of strain response due to its localized nature. The characteristics of strain response are then analyzed in detail numerically and studied considering modal contributions.
| Original language | English |
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| Publication status | Published - 2015 |
| Event | 44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015 - San Francisco, United States Duration: 9 Aug 2015 → 12 Aug 2015 |
Conference
| Conference | 44th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2015 |
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| Country/Territory | United States |
| City | San Francisco |
| Period | 9/08/15 → 12/08/15 |
Bibliographical note
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