In most industrial environments, vibration analysis is widely used for fault diagnosis of rolling bearings. The vibration signal measured from a bearing represents a mixture of motor vibration, rolling vibration, noise, and other sources. Due to the high cost of devices and limited space, only one sensor can be installed to measure this signal. In this paper, a feature extraction method based on Single Channel Blind Source Separation (SCBSS) and Normal Distribution (ND) is proposed for vibration monitoring of rolling element bearings. To decompose the bearing signal, SCBSS is applied for separating the different sources. Because ND is sensitive to the type of fault, it is used as criterion to find an output that contains the maximum information about the fault by removing the other sources. In fact, the obtained signal contains other vibrations which affect the correct source of fault. A second SCBSS filter is, therefore, proposed to decompose the selected source and thus improves the performance of fault diagnosis. The application of the proposed method is carried out on a deep groove ball bearing with outer race fault, ball fault, and inner race fault in order to better validate the diagnosis results.

In this study, an efficient full-wave method is developed for characterizing the resonant frequencies, bandwidths, and quality factors of an inverted circular superconducting patch antenna. Our technique is based on the Galerkin procedure in the Hankel transform domain (HTD) combined with the complex resistive boundary conditions. With the use of suitable Green’s functions in the HTD, the analysis is performed for the case where the superconducting circular patches is printed on an anisotropic substrate. The numerical results obtained using this approach are compared with the experimental results. These comparisons were very good, which proves the correctness and the validity of the method. It is found that the optical properties combined with optimally-chosen structural parameters of anisotropic materials can maintain control of the resonant frequency and exhibit wider bandwidth characteristics.

In this paper, we propose a full-wave analysis for characterizing the resonant frequencies and bandwidths of high-temperature superconductor inverted microstrip printed on anisotropic substrates. Our proposed approach is based on Galerkin procedure in the Fourier transform domain (FTD) combining with the complex resistive boundary condition. With the use of suitable Green's functions in the FTD, the analysis is performed for the case where the superconducting rectangular patches printed on anisotropic substrate. The numerical results obtained using the proposed approach are compared with previously published numerical results computed by means of the electromagnetic simulator “IE3D software”. These comparisons were very good, which prove the correctness and the validity of the proposed method. It is found that the optical properties combined with optimally chosen structural parameters of anisotropic materials can be maintaining control of the resonant frequency and exhibiting wider bandwidth characteristics.

In this work, a novel multifunction, multiband, and implantable PIFA antenna for biomedical telemetry is proposed. The covered frequency bands are the Medical Device Radiocommunications Service (MedRadio) (401 – 406 MHz), and Industrial, Scientific, and Medical (ISM) (433.1 – 434.8, and 902.8 – 928.0 MHz, and 2.4 – 2.4835 GHz), and the Wireless Medical Telemetry Service (WMTS) (1.395 – 1.400, and 1.427 – 1.432 GHz). The third ISM frequency band is reserved to the Wireless Power Transfer (WPT) function, The fourth ISM frequency band is dedicated to the wake - up operation, and the other operation frequency bands are proposed for data telemetry communications. The miniaturization is achieved by the shorting in PIFA, the radiating patch shaping by meandering and arms inserting, and open-ended slots inserting in the ground plane, the occupied volume is of 78.52mm ³ . Both the Equivalent Isotropic Radiated Power (EIRP) and the Specific Absorption Rate (SAR) restrictions are considered for the data telemetry, and the WPT functions performances. The obtained performances make the proposed antenna a good candidate for telemetry functions through muscle implants devices.