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Early detection of cracks in engineering structures by vibration-based methods requires monitoring systems that can evaluate natural frequencies with high accuracy. This paper introduces a method for estimating the natural frequencies using features extracted from the vibrational response of structures excited to cross through the resonance. To this aim, an open-loop acoustic system able to ensure...
Frequency and magnitude evaluation are two of the main signal analysis tasks in the electrical power systems. This paper presents a simple and robust algorithm which enables an accurate estimation of the harmonic parameters of signals with unknown frequency. Differing from the existing approaches, frequency and magnitude of harmonic waves are simultaneously and precisely identified. The proposed algorithm...
The paper presents results obtained for the cooling process of a new-designed SMA-based wave generator (SMA-WG), which represents the deforming component of a harmonic drive. SMA-WG is driven by two-way SMA elements and, due to this, it does not require a driving motor. Correct SMA-WG operation supposes a simulated rotational ellipse performed by SMA elements, which is achieved by a cyclical control...
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