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- W2008689097 abstract "Windmills are large composite structures, usually located at difficult-to-access sites, bearing strong dynamic loads in a harsh environment. In-service inspection involves dismounting the blades, a very costly process. Instead of inspecting the windmills regularly, they are usually overdesigned. Furthermore, the design of a windmill is based on estimated wind conditions, while the real wind (or the wind loads) is seldom measured. The main inconvenience for it are the characteristics of the conventional equipment needed to carry out the measurements (long-term drift in strain gauges, size of the accelerometers, etc). The substitution of traditional sensors for Bragg gratings and piezoelectrics to measure the strain field and vibrational frequencies adds the advantages of a smaller size, no drift, no EMI and the possibility of embedding them while manufacturing, so the windmill is fully equipped when installed. Long-term measurements are possible to check both the in-service conditions and the degradation of the structure. Two possibilities were tested: embedding of the sensors while manufacturing with low disturbance of the process and surface-bonding of the sensors. Windmill qualification tests were carried out to check this new technology and the obtained results were compared to those from conventional sensors. Also in-service long-term tests to check the survivability of the Bragg gratings and the piezoelectric sensors under extreme environment are presently running Results are hopeful. The next step could be a permanent connection via modem to a remote controller that can use the acquired data to map the wind conditions and/or the structural health." @default.
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- W2008689097 date "1999-07-09" @default.
- W2008689097 modified "2023-10-18" @default.
- W2008689097 title "<title>Online diagnosis of the structural behavior of windmills by Bragg gratings and piezoelectrics</title>" @default.
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- W2008689097 doi "https://doi.org/10.1117/12.351582" @default.
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