Towards system-level simulation of a miniature electromagnetic energy harvester model

Energy harvesting, a solution to provide a lifetime power supply to wireless sensor nodes, has attracted widespread attention in the last two decades. An energy harvester collects ambient energy, e.g., solar, thermal, or vibration energy, and transforms it into electrical energy. In this work, we work on an electromagnetic energy harvester model, which is composed of four magnets oscillating along a coil. Such a device converts the vibrational energy into electrical energy. We reproduce the electromagnetic energy harvester model in finite element-based software. In order to include this model in a system-level simulation, the methodology of extracting a look-up table-based equivalent circuit model is presented. Such an equivalent circuit model enables the interaction of the electromagnetic energy harvester model with both electrical and mechanical compact models at the system-level. Furthermore, the matrix interpolation-based and algebraic parameterization-based parametric model order reduction methods are suggested for speeding up the generation of the equivalent circuit model and the design optimization process with respect to magnet dimensions. The efficiencies of these two methods are investigated and compared

Proceedings of the Conference on Progress in Electrically Active Implants - Tissue and Functional Regeneration (ELAINE 2020)

The conference on Progress in Electrically Active Implants - Tissue and Functional Regeneration (ELAINE 2020) focused on novel methods in the electric stimulation of bio-material compounds of living cells and implantable electric stimulation devices. ELAINE 2020 provided international scientists a virtual platform to discuss the latest achievements in the form of invited presentations, selected talks from abstract submissions, and virtual poster sessions. In addition, we particularly invited critical reviews and contributions with negative results or unsuccessful replications to foster the scientific discussion and explicitly encourage young scientists to contribute and submit their work

The effect of plasma welding and carbides presence on the occurrence of cracks and micro-cracks

Presented in this paper is the effect of plasma welding (hardfacing) and carbides presence on the occurrence of cracks and micro-cracks in the welded layer. The reasons behind this phenomenon were analyzed and explained. In addition, the plasma welding technology with all the necessary data such as welding parameters is shown for the case of a non-damaged tooth of a machine used for milling of marble. Welded layer with a significant amount of tungsten-carbide was applied onto new, non-damaged tooth in order to improve the characteristics of the surface layer of the base material, by increasing its hardness which leads to increasing of wear resistance and impact toughness. After welding, tooth was cut using an electrical discharge machining (EDM) for the purpose of examinations of the ap-plied surface layer in different locations throughout welded joint. Macro and micro-structure analysis aided in determining the characteristics of the surface layer. The nature and causes of cracks and micro-cracks were analyzed, in order to provide a better solution to avoid cracks occurrences, as well as in determining of their potential effect on the integri-ty of the tooth as a whole

The Effect of Plastic Deformation on Structural Integrity of Austenite-Ferrite Welded Joint

Structural integrity is the science and technology of the margin between safety and disaster. Cata-strophic failure of any structure can be avoided if structural integrity is assessed and necessary precau-tion is taken. In this research structural integrity assessment of welded joints is studied both numerical-ly and experimentally. The application of fracture mechanics depends on available data, material behavior, environmental effect and loading. In predominantly static loading material behavior can be described as elastic-plastic, with crack opening displacement (COD) or the J integral as parameters. The theoretical and experimental analyses cannot fully describe the behavior of the cracked welded joint and its heterogeneous microstructure. For that purpose, the numerical analysis can be helpful, if applied in a proper way. An example of the finite elements numerical analysis of welded joints is pre-sented. It has been shown that previous plastic deformation of the base metal has detrimental effect on structural integrity of a pressure vessel