The bridges over navigation waterways are exposed to ship collision and ship-bridge collision accidents have been
widely reported worldwide. The measurement of ship impact force during a collision accident is of great importance for
condition assessment of ship-collided bridges and subsequent strategic actions made by the bridge authority. The impact
force of ship-bridge collision is usually evaluated by use of the measured structural responses during ship collision and
an identification algorithm, but the accuracy is limited. In this paper, a method for direct impact force identification of
ship-bridge collision using smart piezoelectric sensors is proposed. The feasibility and effectiveness of the proposed
method is demonstrated by experimental study on a scale pier model of a cable-stayed bridge. The piezoelectric sensors
are embedded into the scale pier model and the impact force is generated by a hammer. Various impact sceneries are
taken into account to investigate the capacity of the piezoelectric sensors for impact force identification. Through
acquiring the voltage signals from the piezoelectric sensors at different locations, the impact force is identified with the
aid of the calibrated relationship between the impact force and the voltage output.
Wind energy utilization as a reliable energy source has become a large industry in the last 20 years. Nowadays, wind
turbines can generate megawatts of power and have rotor diameters that are on the order of 100 meters in diameter. One
of the key components in a wind turbine is the blade which could be damaged by moisture absorption, fatigue, wind
gusts or lighting strikes. The wind turbine blades should be routinely monitored to improve safety, minimize downtime,
lower the risk of sudden breakdowns and associated huge maintenance and logistics costs, and provide reliable power
generation. In this paper, a real-time wind turbine blade monitoring system using fiber Bragg grating (FBG) sensors with
the fiber optic rotary joint (FORJ) is proposed, and applied to monitor the structural responses of a 600 W small scale
wind turbine. The feasibility and effectiveness of the FORJ is validated by continuously transmitting the optical signals
between the FBG interrogator at the stationary side and the FBG sensors on the rotating part. A comparison study
between the measured data from the proposed system and those from an IMote2-based wireless strain measurement
system is conducted.
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