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Showing 1 to 4 of 4 for “"Half power bandwidth"”.
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Evaluation of linear and nonlinear vibration methods to characterize induced microstructural damage in portland cement-based materials
… was investigated. Linear (resonant frequency, half power bandwidth) and nonlinear (fast dynamics, slow dynamics) vibration measurements, using both transverse and longitudinal modes of vibration, were applied in this study. Vibration excitation and sensing was carried out as described in ASTM C …
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Remote optical excitation and sensing of structural vibration
… modulated 800 nm laser diodes with peak-to-peak powers of the order of 25 mW. The vibrations are sensed using a modified form of a fibre optic Mach-Zehnder interferometer, which uses a 2 mW He-Ne laser source. The interferometer senses changes in optical path between the partially reflecting …
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Investigation of internal damping in carbon fiber and steel cables
… investigated. The damping is identified by the half-power bandwidth' method and the 'logarithmic decrement' method. The results indicate that, typically, damping decreases as the length, tension and the number of turns of the tested cable increases. Also, temperature and air pressure contribute …
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Dynamic Testing and Modeling of a Superelevated Skewed Highway Bridge
… using the imaginary components of the FRFs. The half-power bandwidth method was used to estimate the damping for each mode, with values ranging from 1% to 5% of critical damping. Finite element (FE) models of the bridge were constructed in the commercial FE software Abaqus. The effects of adding …