___Projects of Scientific Grant Agency of Ministry of Education VEGA___
- VEGA: Nr. 1/1163/12 (2012 – 2015)
Project title: Research and optimisation of selected parameters of progressive magneticv and multicomponent composite materials and nanomaterials with required properties for applications in electrical and mechanical engineering industry
Principal investigator: doc. Ing. Rastislav Dosoudil, PhD.
Scientific goals fol whole period of the project:
- Analysis of virtue of substituents at newly developed ferrites and ferrite fillers on their structural changes and on their effective electromagnetic parameters (permeability, permittivity, reflective and transmissive parameters and conductivity).
- Selection of substituents for targeted eventually potential applications of final samples. Investigation of virtue of amounts of additives on the required modification of microstructure of ferrites.
- Synthesis and optimisation of selected physical and electromagnetic properties of NiZn ferrites substitued by gadolinium (NiZnGd system) and by europium (NiZnEu systems).
- Preparation of nanoparticular MeZn ferrites and investigation of selected structural and electromagnetic properties to start with the system, where Me = Zn.
- Investigation of multi-component composite materials based on metallic ferromagnetic materials (FeSi, Co, carbonyl iron, Permalloy, Permendur), ferrite systems (NiZn, MnZn, LiZn and low-coercivity hexagonal ferrites) and polymer matrix (polyester resin, polyvinylchloride (PVC)) with the aim to improve their dielectric properties (permittivity) and magnetic properties (permeability) and electromagnetic absorption properties (return loss, absorption bandwidth, matching thickness and matching frequency of the absorber).
- To continue in systematic study of virtue of variation of content of iron in NiZn ferrite on selected structural and electromagnetic parameters.
- Preparation of composite materials based on nanoparticular NiZn ferrite and various polymer matrices (PVC and polyester resin) and investigation of selected electromagnetic properties.
- Upgrading and especially a widening the frequency range of the existing automated system for measurement of dielectric, magnetic and electromagnetic absorption properties of prepared materials.
- VEGA: Nr. 1/0963/12 (2012 – 2014)
Project title: Methods of selected electromagnetic compatibility (EMC) test validation
Principal investigator: prof. Ing. Viktor Smieško, PhD.
Scientific goals fol whole period of the project:
This submitted project is focused on a solution of state-of-art and exacting science problem an electromagneti compatibility (EMC), which features in modern electrical systems in term of assurance of their functional reliability and safety at current rapid progress of them. The project covers a field of control, information technology, mechatronic and first of all a field of state-of-art communication technology. Scientific goals of the project are directed into following three main areas:
A. Creation of a mathematical model and detailed analysis of radiated emission measurement using state-of-art approach in a solving of radio-frequency electromagnetic field problems. Investigation of particular factors effect on entire uncertainty of the measurement in order to obtain values of these contributions. Proof of possible correlations among particular influencing factors and their effect on the measurement uncertainty. Creation of novel procedures and recommendations leading to a reduction of the uncertainty and increasing of a quality of the radiated emission measurement.
B. Investigation of cables effect on validity of rf EMC tests. Creation of suitable mathematical, numerical and physical models of characteristic types of the shielded cables, which describes fully their properties in term of EMC in electromagnetic environment. Implementation of created cable models into numerical simulators of electromagnetic fields. Validation of the mentioned models by means of a comparison of simulation and measurement results. Creation of methodology for an examination of shielded cables effects (their properties, geometrical arrangement, termination, etc.) on the results and the uncertainty of the radiation emission measurement and the immunity test against rf electromagnetic field.
C. Creation of a methodology to evaluation metrological properties of state-of-art methods of the radiation emission measurement using spectral analysis, which is realized by means of digital signal processing.
- VEGA: Nr. 1/1325/12 (2012 – 2014)
Project title: Advanced methods for identification of magnetic parameters of ferromagnetic materials aimed at construction materials inspection and electrical steels diagnostics.
Principal investigator: doc. Ing. Elemír Ušák, PhD.
Scientific goals fol whole period of the project:
- Assessment of the effects of plastic deformation and thermal loading on the magnetisation process character by means of MAT and BN methods, analysis of stress-induced anisotropic properties of the material under diagnostics from the viewpoint of magnetisation process, recognition of the influence of various defect types,
- examination of the influence of structural changes during „refining“ annealing of oriented electrical steels on the character of irreversible changes in magnetisation thus affecting BN parameters, namely focus on the correlation between the grain-size and texture with selected/optimal BN parameter,
- continue in the analysis of the correlation between traditional hysteresis parameters of soft magnetic materials with non-standard (new) Barkhausen noise parameters obtained by noise signal processing
- look for, verify and apply the models of magnetisation curves with regard to the optimisation of feedbacks required for defined sample excitation,
- in cooperation with “Universal Network for Magnetic Non-Destructive Evaluation” (UNMNDE) institutions contribute to MAT and BN methods being adopted as the standard NDE methods for the diagnostics of ferromagnetic construction materials,
- carry on the development of new measuring systems with the emphasis on:
a) optimisation of magnetic circuit design - magnetisation yoke and specimen - for various materials and shapes from the point of view of the magnetic field amplitude and homogeneity in the sample volume under investigation,
b) ensuring of defined waveform shapes of the magnetic quantities in the place of sensing head and/or coil systems in anti-series connection, utilisation of various digital feedbacks,
c) measuring system portability from the viewpoint of on-site applicability.
- VEGA: Nr. 2/0006/10 (2010 – 2012)
Project title: Stavba a riadenie mikro-elektro-mechanických prvkov a zariadení
Principal investigator at STU: doc. Ing. René Harťanský, PhD.
Scientific goals fol whole period of the project:
The general goal of the project is theoretical study and methodical/experimental evaluation of concepts for design and control of micro-mechatronic elements and devices. Objectives of the project are mutually dependent problems to be elaborated.
- Analysis of complex (micro) electro-mechanical structures and building models.
- Modeling and simulation of MEMS performances (frequency, stiffness, compliance, response, control, etc.).
- Optimization of design with respect to desired performance, parameters of mechanical structure, limit conditions, control , or desired characteristics (for instance in cases of sensors). Optimal design and solving MEMS with respects to application. Solving micro-electromechanical elements and possibility of integration in complex structures. Evaluation of topology, principles of sensing and technology in relation to mechanical structures as well as functional requirements (accuracy, ranges of motions, parameters of actuators, energy sources, signal /data transfer , etc.).
- Methods of data transmission, and processing signals from sensors, communication and control for
micro-robotics elements and devices. Sensing, signal transmission and processing information and control of mechatronic systems with diagnostics for correct function. Elaboration of these problems supposes a task – oriented approach to analysis, modeling and design of MEMS. From the MEMS design point of view it could be applied a concept of the engineering (intuitive) preliminary design together with methods for exact analysis and synthesis of complex MEMS structures. It is considered using available SW tools and systems for analysis and modeling mechanical structures, signal processing and control.