This work addresses the problem of fault detection and diagnosis (FDD) for a quad-rotor mini aerial vehicle (MAV). Actuator faults are considered on this paper. The basic idea behind the proposed method is to estimate the faults signals using the extended state observers theory. To estimate the faults, a polynomial observer is presented by using the available measurements and know inputs of the...

A semi-empirical model is derived to predict the board level drop-impact lifetime of HVQFN-packages soldered on a printed circuit board. The strain that evolves in the soldered interconnections is evaluated by a finite element model and related to the experimentally determined lifetime. The result is a power law and it is compared to literature data. In addition, a measure for the strain on the...

High-quality surface reconstruction of scanned physical objects using CAD or polygonal modeling packages represents a time consuming manual process. So far none of the fully automatic approaches to reconstruct free-from surfaces have lead to satisfying results that can compete with manually created objects based on traditional modeling techniques and most importantly an artist’s experience. In ...