<abstract xmlns="http://www.w3.org/1999/xhtml"> Currently a much higher number of portable devices with improved functionality supporting our job-related and social activities require higher and higher capacity and power offered by sources of power supply. Theoretical analysis of the possibility to achieve exploitation features of currently known portable sources of electric current has led the author to a conclusion that even the best solutions will not meet the desired mass and volume magnitudes in relation to the energy supplied. Therefore, if the sources of energy have reached the physically and economically justified capability limits and they are characterized by significantly varied exploitation properties, a solution combining the advantages of various sources of energy through energy management seems to be sensible. In this connection this article presents the idea of a system of energy control, which using available cells will allow for reducing the weight of power supply systems. The considerations are based on defense-related applications, this, however, does not exclude applications for civilian purposes.</abstract>

A Concept of Minimizing an Electric Power Supply System for Portable Gear and Arms

<abstract xmlns="http://www.w3.org/1999/xhtml"> A control system supporting motion of an underwater robotic vehicle along a reference trajectory in the horizontal plane is presented in the paper. A waypoint line-of-sight scheme and nonlinear PD control law are applied to calculate command signals. Parameters of the proposed control law are tuned using genetic algorithms. The validity and advantages of the approach are illustrated through numerical simulation results.</abstract>

Nonlinear Control of Underwater Robotic Vehicle in Plane Motion

<abstract xmlns="http://www.w3.org/1999/xhtml"> This paper provides the definitions and basic properties related to a discrete state space semi-Markov process. The semi-Markov process is constructed by the so called Markov renewal process that is a special case the two-dimensional Markov sequence. The Markov renewal process is defined by the transition probabilities matrix, called the renewal kernel and an initial distribution or by another characteristics which are equivalent to the renewal kernel. The counting process corresponding to the semi-Markov process allows to determine concept of the process regularity. In the paper are also shown the other methods of determining the semi-Markov process. The presented concepts are illustrated a simple example.</abstract>

Concept of Semi -Markov Process

<abstract xmlns="http://www.w3.org/1999/xhtml"> This article presents a summary of years of research of corrosion resistance and corrosive-stress marine materials and their joints. Aluminium alloys and marine steels including the austenitic have been the subject of research in terms of resistance of these materials for electrochemical corrosion in sea environment. Under certain conditions austenitic steels and aluminium alloys show low susceptibility to corrosion due to the protective oxide film which form itself spontaneously on their surfaces and which became a part of monitoring corrosion of these materials. Unfortunately, the real conditions of ship structures loads and the impact conditions of the sea environment show the need to search for the new materials or to modify those already used in order to increase their corrosive-stress resistance. The welded joints of the above mentioned materials were the special subject of corrosive research and nowadays their friction stir welding joints. Modifying the structure of the origin materials by the alloyed elements, changing the parameters of the heat treatment, using the suitable protective paints or selection of the proper adhesives to connect these materials are the methods used in the following research to increase the corrosion resistance of the aluminium alloys. However, monitoring corrosion based on the patent US 2167 23 states a particular point of these research.</abstract>

Study of the Corrosion Resistance of Ship Aluminium Alloys

<abstract xmlns="http://www.w3.org/1999/xhtml"> The paper presents the issues associated with the domestic construction of unmanned surface vessels, which are in the limelight of western counties as one of the reinforcing elements of internal security and maritime economy. Also discussed are some experiences from construction of the first such vessel named ‘Edredon’, and on the example of Gdansk Bay and the seaport of Gdynia a number of selected tasks that can be carried out by a vessel in the process of state’s maritime services protection, and in monitoring and protection of the seaports and objects of critical infrastructure. Moreover, the directions for further development (autonomous vessels, in particular) that can be accomplished in a short period of time, based on domestic scientific abilities and shipbuilding industry are indicated.</abstract>

Application of Domestic Unmanned Surface Vessels in the Area of Internal Security and Maritime Economy — Capacities and Directions for Development

<abstract xmlns="http://www.w3.org/1999/xhtml"> This article presents the results of operations performed by an underwater vehicle in the course of approaching a target across water in which there exist pre-defined obstacles and sea currents. The mathematical model of a self-propelled payload for neutralizing mines type ‘Głuptak’ is used to model the operations performed by the vehicle. Because the underwater vehicle is powered by batteries it is necessary to assess whether there will be enough energy required to continue the approach to the target in the case of changes in the environment. The results presented refer to the effect of interference, caused by the marine environment, on the possibility to use the vehicle for this task. The energy consumption for the mentioned task is optimized with a genetic algorithm.</abstract>

The Effect of Interference Parameters on the Exploitation Capabilities of an Underwater Vehicle

<abstract xmlns="http://www.w3.org/1999/xhtml"> In the recent years, a dynamical development of an underwater robotics has been noticed. The robotics is developed in several different directions by many foreign and a few national R&amp;D centers. The development is focused on both an improvement of construction and features of the underwater vehicles (a hardware development) and an increase of underwater vehicle autonomy providing to a swarm control (a software development). In the paper, new research area focused on biomimetic underwater robots undertaken at the Institute of Electrical Engineering and Automatics in the recent years is presented. The area concern both hardware and software development of the underwater vehicles. In the paper, the research on biomimetic underwater vehicles developed within national and international projects is described. At the end of the paper, a summary containing foreseen research is included.</abstract>

Research on Biomimetic Underwater Vehicles Undertaken at Institute of Electrical Engineering and Automatics

<abstract xmlns="http://www.w3.org/1999/xhtml"> The article discusses the construction of a breathing simulator used at the Department of Underwater Works Technology of the Polish Naval Academy in Gdynia for the research on an open-circuit air diving apparatus for compliance with the PN-EN 250:2014 standard.</abstract>

The Construction of a Breathing Simulator for Research of the Diving Breathing Apparatus in Compliance with the PN-EN 250:2014 Standard

<abstract xmlns="http://www.w3.org/1999/xhtml"> In order to increase security of the country in the field of new materials and technologies and research methods were developed, patented and implemented: austenitic steel X02CrNiMoMnN21-16-5-4 with electrodes for welding of steel and high-strength bainitic steel 10GHMBA-E620T. The author developed a theoretical and technological basis for the design of marine constructional-ballistic shields, which has implemented a pilot scale and technical support. In addition, he developed an original method for testing ballistic shields and unified position to the research, which studied and co-patented.</abstract>

Special Marine Steels and Constructional -Ballistic Shields Designed PNA

AHEAD OF PRINT

Volume 224 (2022): Issue 1 (March 2022)

Volume 223 (2020): Issue 4 (December 2020)

Volume 222 (2020): Issue 3 (September 2020)

Volume 220-221 (2020): Issue 1-2 (June 2020)

Volume 219 (2019): Issue 4 (December 2019)

Volume 218 (2019): Issue 3 (September 2019)

Volume 217 (2019): Issue 2 (June 2019)

Volume 216 (2019): Issue 1 (March 2019)

Volume 215 (2018): Issue 4 (December 2018)

Volume 214 (2018): Issue 3 (September 2018)

Volume 213 (2018): Issue 2 (June 2018)

Volume 212 (2018): Issue 1 (March 2018)

Volume 211 (2017): Issue 4 (December 2017)

Volume 210 (2017): Issue 3 (September 2017)

Volume 209 (2017): Issue 2 (June 2017)

Volume 208 (2017): Issue 1 (March 2017)

Volume 207 (2016): Issue 4 (December 2016)

Volume 206 (2016): Issue 3 (September 2016)

Volume 205 (2016): Issue 2 (June 2016)

Volume 204 (2016): Issue 1 (March 2016)

Maritime Technical Journal

 Scientific Journal of Polish Naval Academy has been published since 1959 (in electronic version since 2004). Every year four volumes are published. In this Journal Authors publish their original and previously unpublished scientific articles in the area of technical sciences in English. All the articles contain Polish summaries and key words. All the articles are reviewed by two reviewers. The list of reviewers is published once a year. The Journal has online and printed versions. Why subscribe and read  In the Journal one can find original scientific articles from technical fields, mainly Mechanical Engineering, Electrical Engineering, Geodesy and Cartography. ‘Scientific Journal of Polish Naval Academy’ is an excellent platform for exchanging knowledge and experiences for scientists and experts. Each new issue of the Journal contains articles which present high quality research results of Polish specialists and is an excellent source of professional knowledge for the recipients.  Why submit  Our Journal offers review procedure and short deadlines between sending of the article and approval for publication. All articles are available in Open Access.  The journal has no article processing charges (APCs) and submission processing charges.  Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 