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The paper presents results of experimental and theoretical studies on small-size piezoelectric generators, in which energy of machine mechanical vibrations is harvested and converted to electric energy. These piezoelectric generators were proposed, as an alternative to a battery-based solution, for powering of sensor nodes in condition monitoring systems of(More)
The vibration measurement synchronization between wireless sensor nodes and with rotor revolution frequency of a supervised machine is necessary for diagnostic methods such as: operational modal analysis or operational shape deflection. This paper presents the review of existing methods for obtaining a discrete vibration signal whose sampling instants are(More)
This paper presents the design and the practical realization of a measurement system dedicated to fast real-time multichannel registration of electronic system thermal response. The response is registered in parallel channels with a frequency up to 1 MHz. Such a high frequency is required for the thermal identification of electronic systems. The designed(More)
The paper presents a computationally effective method for fault detection. A system's responses are measured under healthy and ill conditions. These signals are used to calculate so-called signature functions that create a signal space. The current system's response is projected into this space. The signal location in this space easily allows to determine(More)
The paper describes structure and operation principles of power supply system used for Truck Recognition System, which is a part of an advanced SHM installation on an iron-concrete bridge. The authors propose the application of their Energy Harvesting Controller cooperating with both solar cells and a wind generator. The controller enables efficient energy(More)