Production of reciprocating compressors requires a reliable final control, at the end of production line, which assesses the suitability of the compressor to be supplied to the final customer, based on measurements of compressors’ noise and vibration. Existing final test is performed on the basis of listening to compressor sound by skilled operators, but automated final control is required to ensure the reliability and to improve the quality. Therefore, an adaptive mechatronic diagnostic system was developed in the Laboratory of Synergetics. The system recognises the quality of compressors based on vibration measurements. The system consists of several mechatronic assemblies for the provision of prescribed working conditions of the compressor (electrical connection, back-pressure system), and the measurement and management software system. Algorithms based on psychoacoustic analysis of vibration were developed for recognition of compressor defects. The pilot operation of the industrial system confirmed the capacity of the system to reliably detect compressor defects, and thus significantly contribute to ensuring the final quality at the end of production line.
F.15 Development of a new information system/databases
COBISS.SI-ID: 11851035Intergranular stress-corrosion cracking (IGSCC) is one of the most dangerous and insufficiently understood types of corrosion. The main aim of the dissertation has been the investigation of intergranular stress-corrosion cracking (IGSCC), as one of the most dangerous and insufficiently understood corrosion processes of metals. The research is based on the simultaneously used combination of four different measuring methods: acoustic emission (AE), electrochemical noise (EN), elongation measurement, and digital imaging with additional image analysis. The detection and characterization of initiation, crack growth and final failure of a specimen with the four measuring methods is presented. It has been shown that simultaneous use of compatible measuring methods can provide deeper insight into IGSCC processes. Linear correlations among the characteristics of digital images, EN signals and specimen elongation were established. The analysis of signals showed that AE bursts and EN current transients were detected simultaneously during IGSCC. They were related to the physical process of ductile fractures of ligaments that remained at more resistive crystal grain boundaries. Based on the results of the results it was concluded that intergranular stress-corrosion crack growth consists of two predominant processes: dissolution in a crack tip along crystal grain boundaries and ductile breakages of ligaments behind the advancing crack tip. In the dissertation it is also presented that AE signals can be used for automatic monitoring and detection of IGSCC phenomena. Limitations and abilities of each of the used measuring methods for IGCSS detection and characterization is evaluated.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 11776027Adaptive and natural computing algorithms : 10th international conference, ICANNGA 2011, Ljubljana, Slovenia, April 14-16, 2011 : 146 submited contributions, 90 selected, presentde and publisjed in proceedings, (Lecture notes in computer science, 6593, 6594). Berlin; Heidelberg: Springer, cop. 2011. 2 zv. (XVI, 433 str.; XVI, 403 str.), ilustr. ISBN 978-3-642-20281-0. ISBN 3-642-20281-0. ISBN 978-3-642-20266-7
B.01 Organiser of a scientific meeting
COBISS.SI-ID: 8310612