Wyniki wyszukiwania - Biblioteka Nauki

1

Phenomenon of force impulse restitution in collision modelling

100%

Michalczyk J.

Journal of Theoretical and Applied Mechanics

|

2008

|

tom Vol. 46 nr 4

897-908

EN

The rightness of the Newtonian hypothesis concerning a constat value of the coefficient of restitution R has been confirmed in the paper with reference to collisions in which the loss of energy occurs in conseqence of material damping. For collisions of different nature, when R depends on the density of the energy flux _, the paper points to the possibility of extending this notion to the case of eccentric collision. The possibility of describing R as a random function of _ has been shown as well.

PL

W pracy wykazano, że Newtonowska idea wspłółczynnika restytucji R = const jest słuszna w odniesieniu do zderzeń, w których strata energii powstaje głównie na skutek tłumienia materiałowego. Dla zderzeń o innym charakterze, dla których R zależy od gęstości strumienia energii _, wskazano na możliwość rozszerzenia tego pojęcia na przypadek zderzenia mimośrodowego. W pracy wskazano również na celowość opisania R jako funkcji losowej parametru _ i podano formułę na siłę kontaktową zapewniającą uzyskanie założonej wartości R podczas symulacji cyfrowej procesu zderzenia.

2

Wyprzedzanie na akwenach ograniczonych - gotowość do podjęcia manewru

80%

Lizakowski P.

Zeszyty Naukowe / Akademia Morska w Szczecinie

|

2008

|

tom nr 13 (85)

50-53

PL

Prowadzenie nawigacji na akwenach ograniczonych związane jest z oceną bezpieczeństwa statku, zwłaszcza podczas wykonywania manewrów antykolizyjnych. W pracy przedstawiono czynniki wpływające na manewr wyprzedzania na obszarach o ograniczonej przestrzeni manewrowej. Zaprezentowano wyniki badań manew-rów wyprzedzania przeprowadzonych na modelach redukcyjnych dla statku typu VLCC.

EN

Navigation in restricted basins is connected with evaluation of vessel's safety level, especially during anticollision manoeuvres. The paper presents the factors, which have influence on anticollision manoeuvres in restricted area. The results of the researches concerning overtaking manoeuvres carried out on reduction models for a VLCC ship are presented as well.

3

The Use of Automatic Communication System on Example of a Conversation Between M/V Corvus J and M/V Baltic Ace

80%

Wójcik A. , Banaś P.

Annual of Navigation

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2018

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tom No. 25

267--274

EN

Article presents the applications designed to perform automatic communication as a support for navigators steering their ships. Authors took into consideration the conversation between navigators in the collision situation that occurred at North Sea basin. The performed incorrect communication has been presented and alternative to it has been proposed. The results of simulation made with use of the prototype of automatic communication and negotiation system has been shown.

PL

W artykule zaprezentowano aplikację utworzoną z zamiarem realizacji automatycznej konwersacji dla wspomagania nawigatorów kierujących statkami. Autorzy uwzględnili rozmowę między nawigatorami w sytuacji kolizji, która zdarzyła się na Morzu Północnym. Zaprezentowano niepoprawną komunikację pomiędzy statkami a także propozycję alternatywnej. Przedstawiono też wynik zasymulowanej komunikacji wykonanej z użyciem prototypu systemu automatycznej komunikacji i negocjacji.

4

Determination of additional tension in towed streamer cable triggered by collision with underwater moving object

80%

Blintsov V. S. , Trunin K. S. , Tarełko W.

Polish Maritime Research

|

2020

|

tom nr 2

58--68

EN

The paper deals with issues connected with the behaviour of a streamer cable towed by a survey seismic vessel when the cable undergoes a strike triggered by collision with an underwater moving object. The consequences of such collisions may be both threat to the life of marine animals or damage to underwater units and large economic losses suffered by vessel owners. The risk of such collisions has increased over the last years as a result of increased offshore seismic survey operations. Therefore, a towed streamer should be very robust. To assure its robustness, we should know the deformation mechanism of a single streamer cable. This in turn requires the development of an appropriate mathematical model of such a phenomenon. In particular, the paper presents the characteristics of seismic survey vessels and streamers; an analysis of collisions that have occurred in the past; a statement of the problem, and a computer-aided system supporting simulation of the cable behaviour. To obtain all the necessary design parameters regarding the deformation mechanism of a streamer cable, we set up a dedicated computer-aided system that supports their calculation.

5

Analysis of costs of repairs of undesirable events occurring in a municipal bus transportation system

80%

Bojar P. , Woropay M. , Migawa K. , Szubartowski M.

Journal of KONES

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2011

|

tom Vol. 18, No. 4

19-24

EN

Systems of public transport carry out their tasks on the territory of a given town and in the suburbs performing the same functions as in towns. A distinctive feature of this type of system is performance of its task for twenty four hours, in different traffic intensity conditions over an assigned administrative area. This type of variables has a large influence on occurrence of undesirable events (failure of vehicles and their devastation, collision and accidents). In the work, an attempt of identification of undesirable events occurring in the analyzed transport system has been made. Moreover, an analysis has been made which covers one day of the week, time of the day and weather conditions in which particular events took place. Another aspect of the work was to make an analysis of the vehicle driver's age, job experience and a given hour of work on the day of the event occurrence. Obtainment of such data allowed demonstrating the structure of events according to the criterion of the event type, and costs connected with bringing the damaged transport means to the state of serviceability. The obtained results of experimental tests provide a basis for taking rational decisions by decision makers employed in a given system. These decisions are supposed to reduce the number of undesirable events occurrence and costs connected with them.

6

An analysis of possibilities how the collision between m/v "Baltic Ace" and m/v "Corvus J" could have been avoided

80%

Kulbiej E. , Wołejsza P.

Annual of Navigation

|

2016

|

tom No. 23

121--134

EN

The report presents the simulation results of collision between m/v "Baltic Ace" and m/v "Corvus J". The analysis was performed by means of navigation decision support system (NDSS) in collision situations. This system (NAVDEC) works out anti-collision manoeuvre using AIS (Automatic Identification System) and ARPA (Automatic Radar Plotting Aids) data. Then they are processed by specialized computing algorithms and presented to the operator on a display in the alphanumeric and graphic forms. The data on the specific navigational situation from the report of Bahamas Maritime Authority was used for the generation of signals transmitted to NDSS as a sequence of NMEA strings.

PL

Celem artykułu jest zaprezentowanie wyników symulacji przebiegu kolizji pomiędzy m/v „Baltic Ace” oraz m/v „Corvus J”. Analiza została przeprowadzona przy użyciu nawigacyjnego systemu wspomagania decyzji (NDSS) w sytuacji kolizyjnej. System ten wypracowuje propozycje manewru antykolizyjnego przy użyciu danych z AIS (system automatycznej identyfikacji) oraz ARPA (system automatycznego kreślenia nakresów radarowych). Następnie propozycje te są przekazywane użytkownikowi w formie graficznych rozet i danych alfanumerycznych. Informacje wykorzystane do analizy tej szczególnej sytuacji nautycznej zostały zaadaptowane z raportu Bahamas Maritime Authority jako ciąg sekwencji protokołu NMEA.

7

Analysis of Relationships Between Drivers’ Perception of Road Infrastructure in Poland and their Involvement in Road Accidents and Collisions

80%

Sendek-Matysiak E.

Logistics and Transport

|

2019

|

tom Vol. 42, No. 2

75--82

EN

Road accidents and collisions are very common in Poland and, although for the last several years their number has been constantly decreasing, it is still one of the highest in Europe. This article attempts to provide an answer to the question whether drivers’ overrating the changes in the Polish road transport infrastructure might contribute to the status quo – the factor that has so far been left uninvestigated. In [21] the authors demonstrate that drivers take notice of the changes and perceive them as changes for the better.

8

Determination of the Last Moment Manoeuvre for Collision Avoidance Using Standarts for Ships Manoeuvrability

80%

Koszelew J. , Wołejsza P.

Annual of Navigation

|

2017

|

tom No. 24

301--313

EN

The paper presents a concept of the new algorithm solving Last Moment Manoeuvre problem. Last Moment Manoeuvre means that action taken only by one vessel is not enough to avoid collision. This is why both vessels have to synchronize their manoeuvres to pass each other. The main focus of the proposed solution is concentrated on the procedure defining the best possible manoeuvre for each vessel when avoiding a collision is no longer possible. For simplification, the assumption that the parameters of the vessels involved in the Last Moment Manoeuvre meet Standards for Ships Manoeuvrability set out in the IMO resolution, will be adopted. The algorithm presented in the paper will be implemented and tested in the commercial system.

PL

W artykule przedstawiono nowy algorytm rozwiązania, tzw. manewru ostatniej chwili. Pod tym pojęciem autorzy rozumieją manewr, gdy działania podjęte przez tylko jeden statek nie zapewnią uniknięcia kolizji. Dlatego oba statki muszą zsynchronizować swoje manewry, by minąć się bezpiecznie. Istota zaproponowanego rozwiązania sprowadza się do procedury definiującej optymalny manewr dla każdego statku, zapewniając jednocze-śnie zapobieżenie kolizji. Dla uproszczenia przyjęto założenie, że jednostki spełniają standardy dla sterowności statków ustanowione w rezolucji IMO. Zaproponowany algorytm będzie implementowany i przetestowany w systemie oferowanym komercyjnie.

9

Simulation of damage process of containership’s side structure due to collision with a rock

80%

Porembski G. , Kozak J.

Polish Maritime Research

|

2008

|

tom S 1

18-21

EN

This paper presents methods and results of a simplified numerical simulation of collision process of containership’s side structure and a rock. Analysis of results of the modeling makes it possible to draw conclusions as to a character of the event as well as to estimate area and depth of damage caused by the penetrating rock, in order to select geometry of a filler and impermeable layer of 2nd protection barrier.

10

The essence of road safety in Poland. Recognition of theoretical and empirical

80%

Przybytniowski J. W. , Pacholarz W. M.

Securitologia

|

2016

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nr 1 (23)

15-31

EN

This article consists of two parts. The first part is based on the theoretical analysis of the concept of safety and prevention measures in road traffic, described in the existing literature and statistics. Whereas the second part focuses on the analysis of vehicle insurance as a financial instrument of economic safety of road traffic participants. In the 21st century, one of very important problems, not only socially but also economically, referring to Poland and other EU countries is the ongoing development of motorisation and, consequently, the progress in transportation. Unfortunately, this development sometimes leads to the growing number of road accidents and their effects.

11

The probability of collision during vessel overtaking

80%

Lizakowski P.

Journal of KONBiN

|

2010

|

tom No. 2-3 (14-15)

91-98

EN

There are many close quarter situations at sea, especially in narrow channels. The problem of overtaking on fairways is a complex issue. Navigation, when carried out in such areas causes reduce of a vessel's safety level, it is necessary to consider limits: ship's particulars, fairway's parameters, human factor, vessel traffic. If these factors are not considered during overtaking, it will cause ship out of fairway or collision. The paper contains the probability of collision during overtaking.

PL

Nawigacja na obszarach ograniczonych wymaga prawidłowej interpretacji i oceny bezpieczeństwa statku w trakcie jej realizacji. Nawigacja prowadzona na tych akwenach wiąże się z obniżeniem poziomu bezpieczeństwa, konieczne jest uwzględnienie ograniczeń: wymiary statku, parametry toru, czynnik ludzki, ruch statków. Nieuwzględnienie tych ograniczeń podczas wyprzedzania, może doprowadzić do wyjścia statku poza tor wodny lub kolizję. Artykuł przedstawia prawdopodobieństwo kolizji podczas wyprzedzania.

12

Causes of traffic incidents in the Wielkopolskie province in the years 2011-2013

80%

Czerniak A. , Leszczyńska M. , Miler A. T.

Infrastruktura i Ekologia Terenów Wiejskich

|

2016

|

tom nr IV/3

1625--1632

EN

Although in recent years the number of traffic accidents and collisions on Polish roads has been decreasing, it is important to identify their most significant causes. This study presents an analysis of 34 causes of road incidents reported by the police in the Wielkopolskie province in the years 2011-2013. A total of 34 causes of traffic incidents (accidents and collisions – X1, ..., X34, respectively) were grouped by means of hierarchic cluster analysis using the nearest neighbour method with Euclidean distances, in a four-dimensional space of parameters (the number of accidents - LW, the number of killed - LZ, the number of casualties, including slightly injured in collisions – LR, the number of collisions - LK). Calculations were conducted using the Statistica ver. 12 package. Analyses showed that the most common cause of traffic incidents included side collisions and rear collisions of vehicles, failure to yield to the right-of-way, failure to adjust the speed to the traffic conditions and failure to keep adequate distance between vehicles. Hitting a tree was only the 19th cause (out of 34 analysed ones); however, consequences of these incidents were tragic (8% of fatal accidents).

13

Analysis of Relationships Between Drivers’ Perception of Road Infrastructure in Poland and their Involvement in Road Accidents and Collisions

80%

Sendek-Matysiak E.

Logistics and Transport

|

2019

|

tom 42

75-82

EN

Road accidents and collisions are very common in Poland and, although for the last several years their number has been constantly decreasing, it is still one of the highest in Europe. This article attempts to provide an answer to the question whether drivers’ overrating the changes in the Polish road transport infrastructure might contribute to the status quo – the factor that has so far been left uninvestigated. In [21] the authors demonstrate that drivers take notice of the changes and perceive them as changes for the better.

14

Rotational Excitation of Diatomic Molecule: Time Dependent Study

70%

Maan A. , Tyagi A. , Prasad V.

Acta Physica Polonica A

|

2018

|

tom 133

|

nr 5

1266-1273

EN

Recent experimental evidences have prompted us to study the dynamics of laser-assisted rotational excitation of a diatomic molecule due to an ion impact. The collision time between the ion and the molecule is very small (few atomic units) and the laser pulses considered are of picosecond range. We study the evolution of the rotational probabilities by varying the various laser parameters (pulse shape, field strength, pulse width, frequency) and collision parameters (impact parameter b, collisional velocity v). It is found that the probabilities of the rotational states depend strongly on the laser pulse parameters and the collision parameters. The study is more emphasised by studying ⟨J^{2}⟩ (a parameter defining the extent of the rotational excitation) and ⟨J_{z}⟩ for the system under concern. For higher value of b, the maximum value obtained by ⟨J^{2}⟩ increases and vice versa. Also, the molecule enters the transient mode for large b and v.

15

The influence of selected strain-based failure criteria on ship structure damage resulting from a collision with an offshore wind turbine monopile

70%

Niklas K. , Bera A.

Polish Maritime Research

|

2021

|

tom nr 4

42--52

EN

Offshore wind farms are developing well all over the world, providing green energy from renewable sources. The evaluation of possible consequences of a collision involves Finite Element computer simulations. The goal of this paper was to analyse the influence of selected strain-based failure criteria on ship damage resulting from a collision with an offshore wind turbine monopile. The case of a collision between an offshore supply vessel and a monopile-type support structure was examined. The results imply that simulation assumptions, especially the failure criteria, are very important. It was found that, using the strain failure criteria according to the minimum values required by the design rules, can lead to an underestimation of the ship damage by as much as 6 times, for the length of the hull plate, and 9 times, for the area of the ship hull opening. Instead, the adjusted formula should be used, taking into account both the FE element size and the shell thickness. The influence of the non-linear representation of the stress-strain curve was also pointed out. Moreover, a significant influence of the selected steel grade on collision damages was found.

16

Kinematic model of multiple trailers on a tractor system for production logistics applications

70%

Paszkowiak W. , Bartkowiak T. , Pelic M.

Archives of Mechanical Technology and Materials

|

2019

|

tom Vol. 39

16--25

EN

This paper demonstrates kinematic analysis of multiple trailers on a tractor system for production logistics. The analysis concerned three different steering systems of the trailers: virtual clutch and drawbar system, conventional clutch and drawbar system, double Ackermann steering system. Designed kinematic models contain various variants of paths: turning at a constant value of the steering angle, changing the steering angle as a result of an approaching collision. Each of these variants also included driving in a straight line after a 90° turn. The validation of the developed kinematic model was done by using a real logistic train, which path was registered via aerial drone. For each of the developed kinematic models, a visualization of drive through the 90° turn was created.

17

Jurisdiction Collisions In The Criminal Proceedings Of European Union Member States

70%

Jurka R. , Zajančkauskienė J.

Baltic Journal of Law & Politics

|

2015

|

tom 8

|

nr 1

82-105

EN

Employing systematic document analysis and other methods, this article analyses a long-standing and still relevant issue related to the interpretation and application of the law regulating relationships in the field of European Union criminal justice within the framework of the national criminal proceedings that are taking place in EU member states. The article places special emphasis on the explanation and application of the principle of mutual recognition within the framework of one of the newest instruments of international cooperation in the European Union criminal proceedings meant to prevent conflicts of exercise of jurisdiction and to solve issues arising between two or more member states. The analysis of conflicts of exercise of jurisdiction provided in this paper is not limited to a mere explanation of the concept as such, but includes an essential analysis of other related issues, such as the principle of mutual recognition, its influence on the recognition of criminal proceedings as parallel proceedings, and including other aspects related to the matching of the form of national criminal proceedings with the criminal proceedings taking place in another member state. Finally, significant attention is given to one of the objectives in terms of prevention and solution of conflicts of exercise of jurisdiction, namely, the ne bis in idem principle and its application in case of parallel criminal proceedings taking place in two or more member states. One of the key conclusions offered here is that in order to eliminate conflicts of exercise of jurisdiction, positive law in the process of conflicts of jurisdiction must become an effective measure in criminal justice; however, only on the condition that at least a minimum likelihood in the form of criminal proceedings adopted by different EU members states is ensured as a precondition necessary to enable a smooth application of the principle of mutual recognition.

18

Numerical calculations of behaviour of ship double-bottom structure during grounding

70%

Niklas K.

Polish Maritime Research

|

2008

|

tom S 1

22-26

EN

The idea of the CORET project consists in adding, to the existing construction, special polymer-concrete coatings intended for the increasing of ship’s capability against losing structural tightness during collision or grounding. In order to correctly design the protective barriers, to perform relevant numerical simulations is necessary. The elaborating of numerical models of ship structure behaviour during collision is very complicated and requires auxiliary simulations (on submodels) to be performed. This paper is devoted to elaborating a numerical model of a fragment of ship double-bottom structure. On the basis of experimental tests it was possible to verify and calibrate the numerical model which may be used in further design work aimed at the increasing of crashworthiness of structure during collision.

19

Maritime traffic characteristics in waterway with time variant CPA

60%

Jeong J. S. , Park G. K. , Kim K. I.

Annual of Navigation

|

2013

|

tom No. 20

49--58

EN

This paper aims at evaluating the collision risk between the encountering vessels under time- -variant CPA situations and then assessing the maritime traffic characteristics. Radar and AIS data are collected from Mokpo VTS in Korea. All crossing vessels that are navigating within CPA 1 miles of Mokpo-Gu waterway are analyzed. The maritime traffic characteristics is analyzed by surveying the distribution of CPA as a function of TCPA. To make it clear, the traffic operating rate in the Mokpo waterway is also computed. The averages of CPA and TCPA were observed until the encountered vessels pass safety each other after they come in a certain ship domain. As a consequence, the distribution of CPA as a function of TCPA gives a useful information to evaluate the maritime traffic safety.

PL

Celem artykułu jest ocena ryzyka kolizji statków w funkcji zmiany wartości czasu do kolizji, a na tej podstawie oszacowanie charakterystyk determinujących ruch morski. Dane z radarów oraz systemu AIS zostały zarejestrowane w systemie VTS Mokpo w Korei. Przeanalizowano wszystkie przypadki przecinania się tras statków na podejściu do Mokpo-Gu w przypadku, gdy odległość minimalna (CPA) była mniejsza niż jedna mila morska. Charakterystyka ruchu morskiego opisana została poprzez wyznaczenie rozkładu wartości największego zbliżenia statków jako funkcji czasu do nadmiernego zbliżenia (TCPA). Dla pełnej jasności obliczono również współczynnik przepustowości drogi wodnej Mokpo. Opisano średnie wartości odległości największego zbliżenia oraz czasu do wystąpienia CPA bez względu na przekroczenia granic domeny obserwowanych statków. W konsekwencji wyznaczono rozkład wartości CPA jako funkcję TCPA, co okazuje się użyteczne dla oceny bezpieczeństwa ruchu morskiego.

20

The tectono-sedimentary evolution of the Pelagonian Carbonate-Platform-Complex (Late Triassic - Late Jurassic, Evvoia, Greece)

60%

Scherreiks R. , Bosence D. , Boudagher-Fadel M.

Volumina Jurassica

|

2006

|

tom Vol. 4, no. 1

64-66

EN

Carbonate platforms are sensitive recorders of tectonic environments. However, the tectonosedimentary interplay between ancient carbonate platforms and ocean basins is not always recognizable as the oceans involved are not often preserved. In the case of the Pelagonian Carbonate-Platform-Complex, volcano-sedimentary successions of the one-time adjacent Maliac-Vardar Ocean (Stampfli et al. 2001) are partly preserved. These Late Triassic and Jurassic ocean floor deposits and their contemporaneous platform carbonates are being investigated in Evvoia, Greece (Fig. 1) (Scherreiks 2000; Gingins & Schauner 2005; Bosence et al. 2006). The carbonates exceed 1000 m in thickness whereas the contemporaneous oceanic succession of pillow basalt, radiolarite and pelagic carbonates is only about 100 m thick. The investigation shows that the Pelagonian platform-complex is composed of a number of different carbonate platform types (sensu Bosence 2005; Fig. 2). These evolved adjacent to five changing oceanictectonic settings which affected platform subsidence and uplift. 1. Late Triassic seafloor spreading was accompanied by the slow subsidence of a passive margin platform dominated by peritidal carbonates. 2. Late Liassic convergence coincided with stepped-up subsidence and the formation of a drowned or hemipelagic platform. 3. Initial collision during Early Kimmeridgian most likely caused platform tilting, enabling patch-reef development in the midst of the hemipelagic environment. 4. Early Tithonian obduction was contemporaneous with the formation of thrust-top platforms with associated neritic-reefal turbidite and debrite facies, intercalated in pelagic facies. 5. Advanced obduction, in the Late Tithonian, caused rapid subsidence and complete drowning of the platform complex below the CCD.