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Advanced wavelet analysis for structural testing

An advanced and multi-resolution time-frequency technique will be applied - fractional wavelet analysis as self-standing software for analysis of systems response in terms of signal processing (e.G. Signals generated with transient and dynamic responses, two dimensional signals (video signals)).

The aim of the project is the determination and development of procedures and conditions for a testing tool applying advanced wavelet analysis and fractional wavelet analysis techniques for applications in: * Non-invasive structure and structural elements monitoring, * Improved dynamic control of the mechatronic (multi-body) systems and optimisation of the mechatronic structure design through: - an improved controlling system; - signal processing analysis; - signal denoising; - video picture resolution enhancement; - optimisation of the structure design (selection of the appropriate, damping or stiffness elements, joints, etc.). The common tool used for the proposed analysis of systems response in terms of signal processing (signals generated by transient and dynamic responses, two dimensional signals i.e. video signal) will offer an advanced and multi-resolution time-frequency technique - fractional wavelet analysis. The core project issue is that the advanced, fractional wavelet analysis technique applied will result in a type of self-standing software package(s) available, in terms of applicability, in various technological fields in the EU (SLOVENIA) and Western Balkans (SERBIA, MONTENEGRO, CROATIA). Many mechatronic products (e.g. industrial robots, home appliances), can be considered as complex rigid or elasto-plastic multi-bodies facing the problem of achieving dynamic stability with complex motion procedures. Command or monitoring signals are usually based on different sensory techniques determining different physical quantities, i.e. position (contact and non-contact methods, video (two dimensional) signal), force, torque, pressure, temperature, etc. Theoretical evaluation and consequently experimental confirmation of a system response in the form of signal analysis has to be done with an appropriate technique. From the dynamic viewpoint the transient phase of systems can significantly influence the stability of systems. Transient responses of systems can not be evaluated with traditional signal processing tools (e.g. FFT- Fast Fourier Transform, SFTF) but can be successfully evaluated using fractional wavelet analysis. System stability evaluation in the pre-development phase would enable shorter product development time and development of more complex and comprehensive multi-body (mechatronic) systems. The additional goal of the pre-development phase is to obtain a simpler process control with less energy consumption during the process performance. Similar problems of a transient nature arise in the case of non-invasive structural health monitoring and testing of structures and structural elements in different areas, i.e., civil engineering. The regular procedures of non-destructive structural analysis are usually either very time-consuming or expensive in terms of sample destruction and procedure duration. On the other hand classical material testing procedures demand a lot of testing samples from the structure, which is sometimes not feasible and this is especially the case in the industrial environment. In the case of different testing techniques (ultrasonic and acoustic emission for determination of faults or for determination of residual stresses in the structures and structural elements, measurements of transient responses, etc.) appropriate analysis techniques are needed for the filtration and interpretation of obtained data.
Acronym: 
AWAST
Project ID: 
4 930
Start date: 
02-03-2009
Project Duration: 
45months
Project costs: 
750 000.00€
Technological Area: 
Analyses / Test Facilities and Methods
Market Area: 
Manufacturing

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