Goran Ferenc

Virtual robot in distributed control system

Before the development of robotic systems, it is of great importance to perform verification of various types of scenarios within the machine work and testing. That is especially important in designing the machine with new control logic, before releasing the machine. This paper describes 3D simulator, as part of the offline system, within distributed system for robot control. It is developed in Lola Institute and it provides robot control and monitoring. Parts of the developed system communicate via CORBA protocol, allowing remote control of the robot system through an intuitive graphical user interface.

A proposed approach to the classification of bearing condition using wavelets and random forests

This paper presents a proposed approach to the classification of rolling element bearing faults. The approach consists of vibration signal acquisition, digital signal processing, feature extraction from the vibration signal and classification into functional or defective rolling element bearing. Digital signal processing includes signal decomposition and de-nosing using wavelets. An 18-dimensional vector of the vibration signal feature is obtained as a result of feature extraction. Characterization of each recorded vibration signal is performed by a combination of signals time varying statistical parameters and characteristic rolling element bearing fault frequency components. The classification is performed using random forests algorithm.

3D simulator for human centrifuge motion testing and verification

In the process of defining commands and developing algorithms for movements of complex and massive devices, such as human centrifuge, it is unsafe and demanding to perform testing on the real machine. Getting overview of devices operations might be of great importance especially before the final realization. This paper presents a system for programming and simulation of the human centrifuge motion with integrated 3D motion simulator. The simulator is used for verification of newly defined motion commands and testing the new algorithms for the human centrifuge motion.

Statistical properties of music signals at different speeds of playing instruments

The paper presents analyzed statistical properties of music signals from various instruments playing at different speeds. The signals are contained in about an hour of music recorded in the form of ten sequences. The analyzed signals are obtained from five different speeds of playing music for each sequence. For each playing speed time variation of the signal level was found, performed with a 10 ms period of integration in rms calculation and with 70% overlap, statistical and cumulative distributions of signal level, skewness and kurtosis, the parameters L1, L5, L50, L95 and L99, which are derived from cumulative distributions as numerical indicators of dynamic properties. The paper contains detailed statistical data for all five-speed playing.

An infinite beam laser harp with external MIDI I/O functionality

In this paper one particular realization of an electronic musical instrument referred as a laser harp has been presented. The laser harp consists of an array of beams organized in a fan arrangement. In analogy with the plucking of the strings of a harp, laser beams are intended to be blocked to produce sounds. The laser harp can be connected to various, external MIDI equipment providing a wide range of possible MIDI network configurations. The instrument is based on a programmable system-on-chip PSoC 5LP developed by Cypress Semiconductor.