This study addresses the premature failure of electric motor bearings caused by inverter-induced parasitic currents. We propose a novel segmented end shield design utilizing 24 carbon fiber-reinforced polymer (CFRP) lamellae to provide both structural support and galvanic isolation. The "main working" of the design relies on a segmented architecture where the lamellae are adhesively bonded between a central bearing housing and an outer mounting flange, creating a high-impedance path that interrupts circulating currents. Experimental validation focused on both mechanical stability and dielectric performance. Results indicate that the assembly maintains rotor positional integrity under nominal loads while providing an insulation resistance > 1 G Omega at 1 kV and a structural capacitance of 2.47 nF. These parameters effectively mitigate low-frequency circulating currents. Data analysis, derived from the mean values of repeated test cycles, confirms that the composite architecture serves as a viable, mechanically robust alternative to conventional metallic end shields.

The article describes an advanced test stand for measuring temperatures during the 3D printing for additive manufacturing.Based on mathematical procedures, it analyzes the impact energy of the laser beam used in metal 3D printing.The procedure is based on monitoring the flow of energy falling on the defined measuring object.Due to the design of this functional sample, it is also possible to analyze the incident and reflected energy to analyze and understand the physical properties, the precise quantitative distribution of temperatures, gradients, as well as the heating and cooling rates of the melt bath in laser bed fusion (L-PBF)

The paper deals with the detailed analysis and electromagnetic design of coupling elements for wireless power transfer with compensation realized only on the primary side. It summarizes the basic mathematical description of series-none resonance coupling and maps basic operational properties. The conclusions formulated based on mathematical analysis are verified using the time domain simulations.

This paper deals with the analysis of a suitable compensation topology of a wireless power transmission system for powering the rotating parts of modern automatic machine tools. It summarizes the important properties of the serio-parallel compensation topology suitable for this application and demonstrates a detailed mathematical derivation using the first harmonic approximation. The paper details the industrial implementation of the system in a specific automatic machine tool application and demonstrates the strong technical advantages of the proposed design. Important theoretical conclusions and technical assumptions made when considering the system layout are verified by experimental laboratory measurements and the final deployment of the technology in the professional tool DMU 40 eVo linear.

This paper provides a description of the computational approach for quick calculation of noise propagation in enclosed rooms. The main concern of these calculations is to determine the impact of provided modifications that reduce the negative aspects of increased noise levels in enclosed production areas. For this purpose, an algorithm was created based on the calculation of direct and scattered propagation of acoustic sound, which serves as the basis of the program on the LabVIEW platform and thanks to which the calculations were carried out in the production laboratory. The calculated values of the sound pressure levels for numerous variants of sound insulation adjustments were subsequently verified by measuring with a noise measuring device. The applied modifications reduced the sound pressure level at the operator's site by 7.1 dB (A).

The paper proposes a correction method of the oblique-angle vibration for laser doppler vibrometry. It briefly discusses the key mathematical approach considering the surface of the analysed object to be a reference plane and gives a practical example of the method proper application. The proposed correction method is practically verified by laboratory measurement of natural frequencies and mode shapes for vibrations of high voltage transformer housing. The results are further compared to equivalent accelerometer measurement.

The paper proposes a construction design of measuring device for fast and reliable non-contact modal analysis of object surfaces which cannot be measured using classical methods. The design combines conventional non-contact laser interferometer with an active optics module to be able to measure multiple points in a rapid sequence. The paper briefly discusses all the key constructional components and describes in detail the system functional layout. It also introduces the experimental measurement of a HV transformer under operation to demonstrate the system functionality.

The paper analyzes the influence of magnetic wedges on the content of harmonic components in the induced voltage of the machine in the noload state and the pulse torque in the rated state to reduce the pulsation of torque on the rotor. The analysis is done using the finite element method and the model is designed using the symmetry of the machine. In total, four cases were compared and the results could be used for other proposed machines.

A detailed Statistical Energy Analysis (SEA) model of the laboratory buildings belonging to the Regional Technological Institute at the University of West Bohemia has been developed to predict the sound pressure level in all areas after the installation of an anti-noise glass wall to decrease noise propagation from the operational compartments to the offices. The sound field in the rooms and work compartments are treated as a series of connected air cavities and are modelled with the help of VA One software based on SEA. In situ measurements are carried out at various locations within the building to provide energy inputs into the model and also to validate it. Good agreement is shown between the results from the measurements and the SEA model for the frequency range from 20 Hz -20 kHz for the ten chosen operational compartments and the rooms closest to the sound source (water jet cutter). It is concluded that prediction using statistical energy analysis is a reasonable way to predict acoustic pressure values after the installation of a glass wall to decrease noise propagation from the operational compartments.

The paper is focused on the comparison of vibration and emitted noise measurement of induction machine under static eccentricity in an environment with steady acoustic noise producing facilities. Such an environment can introduce for example simple industrial drive stand operating under constant load in a closed room. The analyses are focused to the frequency spectrum up to 1500 Hz which allows us to validate the frequency spectrum of emitted noise by vibration measurement. The analyzed frequency band is sufficient considering vibration response of implemented fault. The analyses of healthy machine are carried on as well to get the reference point.

The paper proposes an experimental methodology for measurement of forces acting on the rotor under special operational conditions. The influence of static eccentricity with different load applied on the rotor is investigated. The paper also describes all necessary motor construction modifications and the procedure of preliminary measuring system calibration.

This paper describes a new test facility for vehicle control experiments build up by the cooperative projects "Semi-autonomous driving" University Duisburg-Essen and "DAVINCI (Design of an Automated INtegrated Control Instrument)" Delft University of Technology. This facility offers the possibility of experimental work with respect to different aspects of autonomous guided vehicles. The test facility represents a platform for future embedded control systems and related vehicle dynamics methodologies.