Aiming to improve the control performance in the switched reluctance (SR) motor drives, this paper presents a simple nonlinear mathematical model of SRM. The model depends on describing the characteristic data obtained from finite element analysis (FEA) in a simple parametric formula. An adaptive fuzzy logic PI controller is used with the suggested model in speed control drive system. The controller is designed based on Mamdani type with nine control rules along with Gaussian function memberships. The control technique is implemented and tested under different operating conditions as well as its results are compared with those of conventional PI controller. Both control schemes operate in pulse width modulation (PWM) control mode. The proposed adaptive fuzzy logic PI improves the motor speed performance in terms of tracking precision and travel time.
BackgroundNail fold capillaroscopy (NFC) is a non invasive diagnostic tool to detect early changes of microcirculation of different collagen diseases as rheumatoid arthritis associated interstitial lung disease (RA-ILD), systemic sclerosis interstitial lung disease (SS-ILD) and idiopathic ILD (Ting et al., 2020).ObjectivesThe study aimed to evaluate role of NFC in RA-ILD, SS-ILD and idiopathic ILD, and to determine if there is a correlation of it to disease activity.MethodsA case control study conducted on 100 patients with ILD, where 30 patients with RA-ILD, 30 patients with SS-ILD and 40 patients with idiopathic-ILD, fulfilling ACR/EULAR criteria, 2013. They were examined clinically and radiologicaly. Pulmonary function tests (PFT) and NFC were done.ResultsPleural irregularities were found in 42% of RA-ILD, 30% of SS-ILD where subpleural irregularities were found in 31% of RA-ILD and 46.7% of SS-ILD. Ground glass opacity was in 13% of RA-ILD, 76.7% in SS-ILD and70% in idiopathic –ILD. Honeycomb appearance was in 11.5% of RA-ILD, 30% in SSILD and 65% of idiopathic ILD.SS-ILD showed the highest capillary changes especially patients with pneumonia. A significant correlation was found between NFC and PFT in idiopathic-ILD.ConclusionNFC is a sensitive and specific adjuvant tool in monitoring micro vascular changes in rheumatologic diseases and can be used as assessment tool in severity of the disease.Reference[1]Ting Z, Lin F and Chen H (2020): Pattern of NFC in patients with SLE. Archives of Rheumatology, 35(4), 568Acknowledgements:NIL.Disclosure of InterestsNone Declared.
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