Transient Electromagnetic-Thermal FE-Model of a SPICE-Coupled Transformer Including Eddy Currents with COMSOL Multiphysics 4.2
H. Neubert, R. Disselnkötter, and T. Bödrich
Technische Universität Dresden, Institute of Electromechanical and Electronic Design, Dresden, Germany
ABB AG, Forschungszentrum Deutschland, Ladenburg, Germany
Current transformers are used to measure currents in power grid systems. They are characterized by strong interactions between external electrical sources and loads respectively and the magnetic subsystem. Self-heating due to losses has to be considered because of the temperature-dependent material behaviour. The paper presents a transient 3D FEA transformer model which includes a H(|B|) ...
Fluid-Structure Interaction Modeling for an Optimized Design of a Piezoelectric Energy Harvesting MEMS Generator
I. Kuehne, A. van der Linden, J. Seidel, M. Schreiter, L. Fromme, and A. Frey
Siemens AG, Corporate Research & Technologies, Munich, Germany
Comsol Multiphysics GmbH, Göttingen, Germany
This paper reports the design of a piezoelectric energy harvesting micro generator for an energy autonomous tire pressure monitoring wireless sensor node. For our design we use a piezoelectric MEMS generator approach without additional mass. The intrinsic mass of the cantilever is in the microgram region and the resulting acceleration forces are very small. The generator has a triangular ...
M. Hackert-Oschätzchen, S. F. Jahn, and A. Schubert
Chemnitz University of Technology
The principle of electrochemical machining (ECM) is the anodic dissolution of a metallic workpiece at the interface to a liquid ionic conductor under the influence of electric charge transport. This erosion principle works independently from the mechanical hardness of the workpiece and is free of mechanical forces. The design of electrochemical machining processes is still performed ...
A. Rosell, and G. Persson
Volvo Aero Corporation, Trollhättan, Sweden
Chalmers University of Technology, Göteborg, Sweden
Interaction between the probe and a defect in eddy current non-destructive evaluation is studied. Evaluation of sensor signal response is the basis for the calculation. In this work a differential sensor is considered and the problem regarded here is problem 8 from the testing of electromagnetic analysis methods (TEAM) workshops. The truncation, referring to the position of the outer ...
C. Balocco, and E. Marmonti
Dipartimento di Energetica “Sergio Stecco”
Università degli Studi di Firenze
The main aim of the present work is the study of the thermal and energy performances of the new hall of the Old St.Maria Nuova Hospital in the center of Florence (Italy). Transient simulations were carried out of the 3D model of the hall to analyse the air flow patterns, distribution and velocity, provided by an existing typical fan-coils air system. The present study highlights the importance ...
S. Carcangiu, A. Fanni, and A. Montisci
Department of Electric and Electronic Engineering
University of Cagliari
In this work an innovative wind power generation in urban areas is proposed. The generation system substitutes the roof of the building and it consists of a static part, the stator, and a moving part, called impeller, which is a centripetal turbine with vertical axis of rotation. Since the objective is to conveying the air flow in the stator, the logarithmic spiral has been chosen as the shape ...
M. Goncalves, T. Makaryan, G. Papageorgiou, U. Herr, and O. Marti
Ulm University - Inst. of Experimental Physics, Ulm, Germany
Yerevan State University, Yerevan, Armenia
Ulm University - Institute of Micro and Nanomaterials, Ulm, Germany
Surface enhanced Raman scattering (SERS) investigations of silver and gold triangular nanoparticles reveal strong field enhancements at the corners of the particles. Though the measurements were done at wavelengths far from the surface-plasmon resonance of the particles, large field enhancements can be generated by near-field coupling between the triangular particles and smaller metal ...
J. Perko, S. C. Seetharam, and D. Mallants
Belgian Nuclear Research Centre
Knowledge of the effect of fractures on fluid flow and transport is of great interest in many fields. In radioactive waste disposal the interest in fractures within concrete structure is because they are mostly more permeable than the matrix, there is less or no sorption and because long-term chemical concrete degradation could progress faster. Assessment of long-term transport processes is ...
S. Heß, R. Külls, and S. Nau
The Fraunhofer Ernst-Mach-Institute (EMI) developed a novel, high-g accelerometer, which is an undamped MEMS device, containing self-supporting piezoresistive elements. The main requirements for such a sensor are high sensitivity, high resonant frequency and a solid mechanical design. Due to the fact, that pure analytic analyses cannot cover all multi-physical aspects of such a complex device the ...
F. Motte, and C. Cristofari
University of Corsica
Laboratory of Vignola
A new concept of solar water collector, highly building integrated has been developed and patented. This collector is hidden into a drainpipe and is totally invisible from the ground level. The drainpipe keeps its water evacuation function. Each installation is composed of several modules serial connected. An experimental wall has been build to test the thermal performances of the instalation ...