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Problems of advancements in signal processing, mathematical tools and new methods of analysis, applied in investigations of different industrial fields, have been intensively explored over the last several years. This issue of the Scientific Journal of Gdynia Maritime University addresses these problems as part of the newly classified discipline of science: automation, electronic and electrical engineering.

This issue consists of five research papers specifically dedicated to such subject matter as the atypical TT/TN-S networks applied in ship technology, walking robots, cooperation of multi-pulse rectifiers with active filters, influence of voltage subharmonics and interharmonics on one-phase induction motors, and the role of simulators in Maritime Education and Training (MET).

The first paper is dedicated to selected issues concerning the usage of atypical TT/TN-S networks in marine electricity systems. In the second paper, some aspects of the design and programming of a walking robot are presented and commented on.  

The third paper presents simulation and laboratory tests of multi-pulse rectifiers with magnetically coupled reactors that were connected to the power grid and cooperated with an active power filter (APF), and the fourth paper analyzes and discusses the influence of voltage subharmonics and interharmonics on the operation of one-phase induction motors.

The last paper is dedicated to the problems of lifelong learning, especially from the Dutch perspective on the role of simulators in Maritime Education and Training (MET).

                                                                       Janusz Mindykowski