Damage Detection in Active Suspension Bridges: An Experimental Investigation.

This paper considers a Hilbert marginal spectrum-based approach to health monitoring of active suspension bridge hangers. The paper proposes to takes advantage of the presence of active cables and use them as an excitation mean of the bridge, while they are used for active damping. The Hilbert⁻Huang transform is used to calculate the Hilbert marginal spectrum and establish a damage index for each hanger of the suspension bridge.

Unimorph mirror for adaptive optics in space telescopes.

This paper presents a unimorph deformable mirror intended to be used as secondary corrector in space telescopes. The deformable mirror consists of a single-crystal silicon wafer (76.2 mm diameter, 500 μm thickness) covered with an optical coating on the front side and an array of 25 independent piezoelectric transducer (PZT) actuators acting in d mode on the back side.