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2 Scientific Journal of Gdynia Maritime University

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Simulation of foundation fieldbus Manchester coded 31.25 kbps H1 bus using MATLAB and Simulink

Abotaleb Mostafa, Mindykowski Janusz, Dudojć Bolesław, Maśnicki Romuald

Scientific Journal of Gdynia Maritime University

2022

nr 123

18--31

The purpose of this article is to provide an understanding of possible techniques through which a H1 31.25 kbps Foundation Fieldbus Manchester coded signal can be modulated or demodulated. This understanding will be rendered through MATLAB and SIMULINK models, simulating both ideal and practical as well as noiseless and noisy conditions during the modulation/demodulation process. The simulation models will differentiate between the modulation methods adopted to generate ideal rectangular as well as practical trapezoidal waveforms for the Manchester coded signal. The analysis of the simulation results will describe the mechanisms through which distortion induced by additive white Gaussian noise can be eliminated during the demodulation process either by using recursive filters, such as a Kalman filter, or by calculating wave energy levels in specific time intervals.

Methodology for Assessing the Effects of Combined Cycle Plant Characteristics on the Quality of Generated Electrical Power

Chinhenha Antonio, Mindykowski Janusz

Scientific Journal of Gdynia Maritime University

2019

nr 111

57--73

This paper deals with the assessment methodology for the impact of combined cycle plant characteristics on the quality of the produced electrical power. The aim of this work is to develop the assessment methodology with the use of an algorithm based on a flowchart of the system. The research methodology includes an analysis of the non-steady state phenomena with use of a MATLAB-Simulink environment and an analysis of the steady-state phenomena based on the theoretical calculations and analytical models of a combined cycle plant of the COGES type, connected with the processes of producing and converting of thermal and electrical power in the considered systems. A key point of the study is to check that the voltage frequency modulation on the shaft of the gas turbine is included in the limits defined by the appropriate requirements of the related IEEE Std 45TM-2002 standard.