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Dettagli della rivista
Formato
Rivista
eISSN
2720-4286
Pubblicato per la prima volta
30 Mar 2016
Periodo di pubblicazione
1 volta all'anno
Lingue
Inglese

Cerca

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

Dettagli della rivista
Formato
Rivista
eISSN
2720-4286
Pubblicato per la prima volta
30 Mar 2016
Periodo di pubblicazione
1 volta all'anno
Lingue
Inglese

Cerca

7 Articoli
Accesso libero

Nonhomogeneous Stochastic Processes Connected to Poisson Process

Pubblicato online: 29 Jun 2018
Pagine: 5 - 15

Astratto

Abstract

Some generalizations of the Poisson process and their properties are presented in the paper. The non-homogeneous Poisson process allows to construct a probabilistic model describing the different kinds of accidents number. The nonhomogeneous compound Poisson process enables to describe mathematically the various types of accidents consequences. Theoretical results give possibility to anticipate the accidents number and their consequences.

Parole chiave

  • nonhomogeneous Poisson process
  • nonhomogeneous compound Poisson process
  • safety characteristics
Accesso libero

Selected Decompression Procedures for Survivors Who Became Saturated in a Sunken Wreck

Pubblicato online: 29 Jun 2018
Pagine: 17 - 34

Astratto

Abstract

This article is one of the series dedicated to the DiveSMART Baltic project conducted to better coordination of international underwater rescue operations in the Baltic Sea. The project DiveSMART Baltic has received Flagship status.

The article is the forth in the planned cycle of articles referring tasks realised in the Naval Academy in the framework of DiveSMART Baltic project. This article describes selected decompression procedures for victims who became saturated by air at maximum depth to H =30 mH2O in the air pockets of the hull of a sunken wreck. This subject is associated with the work package four ‘Medical treatment’ of the DiveSMART Baltic project: Identifies methods for different medical treatments in operational areas.

Parole chiave

  • SAR
  • underwater search and rescue
Accesso libero

Determination of Dynamic Characteristics of Austenitic Steel to be Utilized in Fem Simulation and its Verification

Pubblicato online: 29 Jun 2018
Pagine: 35 - 42

Astratto

Abstract

This paper presents the dynamic mechanical properties of austenitic steel with improved durability, which is used in the construction of hulls of minesweepers, mine destroyers, submarines and other naval vessels. Dynamic tensile tests performed on the steel samples using a rotary hammer with a strain rate of up to 1000 s-1 allowed determination of elastic-plastic characteristics of the material in the form of a polynomial of Johnson-Cook constitutive model, taking into account the influence of strain rate and temperature. A characteristic of this type is utilized in numerical calculations in the CAE software. The obtained characteristics were experimentally verified by bending tests of flat samples with a drop-weight type impact hammer. Simultaneously numerical calculations were performed in order to compare the deformation state.

Parole chiave

  • dynamic characteristics of material
  • drop-weight type impact hammer
  • rotary hammer
  • Johnson-Cook constitutive model
Accesso libero

Unmanned Surface Vehicles in Maritime Critical Infrastructure Protection Applications — LNG Terminal in Świnoujście

Pubblicato online: 29 Jun 2018
Pagine: 43 - 51

Astratto

Abstract

In order to first Baltic LNG terminal in Świnoujście construction, issues concerning maritime critical infrastructure protection as a part of Maritime Security appeared. With the increasing natural gas demand LNG terminal in Świnoujście could be a possible terrorist attack target as well as the LNG carriers crossing the choke point of Baltic Straits and sailing through the littoral waters of Polish and other Baltic counties coastline. Experts do not fully agree on possible effects and results of successful terrorist assault on LNG carrier at sea nor at harbor.

Unmanned platforms begin to play prominent role in military, oceanography or academic applications. With the announcement of reducing the hazard for deck operators especially in high-risk regions, it is predicted that unmanned platforms will play crucial role in Maritime Security systems in the nearest future. This paper discusses the design of the USV dedicated to LNG terminal protection tasks introduces potential equipment options and missions scenarios of first Polish unmanned platform ‘Edredon’.

Parole chiave

  • unmanned surface vehicles
  • maritime security applications
  • unmanned platforms
  • unmanned maritime vehicles
Accesso libero

Report on Research with Biomimetic Autonomous Underwater Vehicle — Navigation and Autonomous Operation

Pubblicato online: 29 Jun 2018
Pagine: 53 - 67

Astratto

Abstract

The paper presents the second part of the final report on all the experiments with biomimetic autonomous underwater vehicle (BAUV) performed within the confines of the project entitled ‘Autonomous underwater vehicles with silent undulating propulsion for underwater ISR’, financed by Polish National Center of Research and Development. The report includes experiments on the swimming pool as well as in real conditions, that is, both in a lake and in the sea. The tests presented in this part of the final report were focused on navigation and autonomous operation.

Parole chiave

  • autonomous underwater vehicle (AUV)
  • biomimetic autonomous underwater vehicle (BAUV)
  • course and depth control
  • autonomous control
Accesso libero

Thrust Measurement of Biomimetic Underwater Vehicle with Undulating Propulsion

Pubblicato online: 29 Jun 2018
Pagine: 69 - 82

Astratto

Abstract

In the recent years, a dynamical development of an underwater robotics has been noticed. One of the newest group of underwater robots are biomimetic underwater vehicles. These vehicles are driven by undulating propulsion imitating fins of underwater creatures, e.g. a fish, a seal, etc.

This paper undertakes problem of thrust measurement of new biomimetic underwater vehicle equipped with undulating propulsion. At the beginning, the stand for thrust measurement is described. Then, two constructions of BUVs imitating a fish and a seal are presented. Further, the results of thrust measurement for two different undulating propulsions are inserted. At the end of the paper containing conclusions from performed measurements and foreseen research is included.

Parole chiave

  • biomimetic underwater vehicle
  • undulating propulsion
  • thrust measurement
Accesso libero

Static Analysis of the Tubular Electromagnetic Linear Actuator with Permanents Magnets

Pubblicato online: 29 Jun 2018
Pagine: 83 - 95

Astratto

Abstract

In this paper a results of a static analysis of the tubular linear electromagnetic actuator is presented. The linear actuator consist of two parts: a cylindrical unmovable coils surrounded by a soft ferromagnetic case, and a runner made from sequence of permanent magnet with a soft ferro-magnetic gasket. In the first part of the paper the analytical method was performed for preliminary analysis. In the second part of the paper the more detailed analysis was depicted with using finite element method (FEM). The magnetic circuit shape and impact of selected dimensions on static characteristics is presented. Then the axial and radial electromagnetic force as a function of the runner dimensions were analysed.

Parole chiave

  • tubular electromagnetic linear actuator
  • permanent magnet linear actuator
  • computer simulation
  • finite element method
7 Articoli
Accesso libero

Nonhomogeneous Stochastic Processes Connected to Poisson Process

Pubblicato online: 29 Jun 2018
Pagine: 5 - 15

Astratto

Abstract

Some generalizations of the Poisson process and their properties are presented in the paper. The non-homogeneous Poisson process allows to construct a probabilistic model describing the different kinds of accidents number. The nonhomogeneous compound Poisson process enables to describe mathematically the various types of accidents consequences. Theoretical results give possibility to anticipate the accidents number and their consequences.

Parole chiave

  • nonhomogeneous Poisson process
  • nonhomogeneous compound Poisson process
  • safety characteristics
Accesso libero

Selected Decompression Procedures for Survivors Who Became Saturated in a Sunken Wreck

Pubblicato online: 29 Jun 2018
Pagine: 17 - 34

Astratto

Abstract

This article is one of the series dedicated to the DiveSMART Baltic project conducted to better coordination of international underwater rescue operations in the Baltic Sea. The project DiveSMART Baltic has received Flagship status.

The article is the forth in the planned cycle of articles referring tasks realised in the Naval Academy in the framework of DiveSMART Baltic project. This article describes selected decompression procedures for victims who became saturated by air at maximum depth to H =30 mH2O in the air pockets of the hull of a sunken wreck. This subject is associated with the work package four ‘Medical treatment’ of the DiveSMART Baltic project: Identifies methods for different medical treatments in operational areas.

Parole chiave

  • SAR
  • underwater search and rescue
Accesso libero

Determination of Dynamic Characteristics of Austenitic Steel to be Utilized in Fem Simulation and its Verification

Pubblicato online: 29 Jun 2018
Pagine: 35 - 42

Astratto

Abstract

This paper presents the dynamic mechanical properties of austenitic steel with improved durability, which is used in the construction of hulls of minesweepers, mine destroyers, submarines and other naval vessels. Dynamic tensile tests performed on the steel samples using a rotary hammer with a strain rate of up to 1000 s-1 allowed determination of elastic-plastic characteristics of the material in the form of a polynomial of Johnson-Cook constitutive model, taking into account the influence of strain rate and temperature. A characteristic of this type is utilized in numerical calculations in the CAE software. The obtained characteristics were experimentally verified by bending tests of flat samples with a drop-weight type impact hammer. Simultaneously numerical calculations were performed in order to compare the deformation state.

Parole chiave

  • dynamic characteristics of material
  • drop-weight type impact hammer
  • rotary hammer
  • Johnson-Cook constitutive model
Accesso libero

Unmanned Surface Vehicles in Maritime Critical Infrastructure Protection Applications — LNG Terminal in Świnoujście

Pubblicato online: 29 Jun 2018
Pagine: 43 - 51

Astratto

Abstract

In order to first Baltic LNG terminal in Świnoujście construction, issues concerning maritime critical infrastructure protection as a part of Maritime Security appeared. With the increasing natural gas demand LNG terminal in Świnoujście could be a possible terrorist attack target as well as the LNG carriers crossing the choke point of Baltic Straits and sailing through the littoral waters of Polish and other Baltic counties coastline. Experts do not fully agree on possible effects and results of successful terrorist assault on LNG carrier at sea nor at harbor.

Unmanned platforms begin to play prominent role in military, oceanography or academic applications. With the announcement of reducing the hazard for deck operators especially in high-risk regions, it is predicted that unmanned platforms will play crucial role in Maritime Security systems in the nearest future. This paper discusses the design of the USV dedicated to LNG terminal protection tasks introduces potential equipment options and missions scenarios of first Polish unmanned platform ‘Edredon’.

Parole chiave

  • unmanned surface vehicles
  • maritime security applications
  • unmanned platforms
  • unmanned maritime vehicles
Accesso libero

Report on Research with Biomimetic Autonomous Underwater Vehicle — Navigation and Autonomous Operation

Pubblicato online: 29 Jun 2018
Pagine: 53 - 67

Astratto

Abstract

The paper presents the second part of the final report on all the experiments with biomimetic autonomous underwater vehicle (BAUV) performed within the confines of the project entitled ‘Autonomous underwater vehicles with silent undulating propulsion for underwater ISR’, financed by Polish National Center of Research and Development. The report includes experiments on the swimming pool as well as in real conditions, that is, both in a lake and in the sea. The tests presented in this part of the final report were focused on navigation and autonomous operation.

Parole chiave

  • autonomous underwater vehicle (AUV)
  • biomimetic autonomous underwater vehicle (BAUV)
  • course and depth control
  • autonomous control
Accesso libero

Thrust Measurement of Biomimetic Underwater Vehicle with Undulating Propulsion

Pubblicato online: 29 Jun 2018
Pagine: 69 - 82

Astratto

Abstract

In the recent years, a dynamical development of an underwater robotics has been noticed. One of the newest group of underwater robots are biomimetic underwater vehicles. These vehicles are driven by undulating propulsion imitating fins of underwater creatures, e.g. a fish, a seal, etc.

This paper undertakes problem of thrust measurement of new biomimetic underwater vehicle equipped with undulating propulsion. At the beginning, the stand for thrust measurement is described. Then, two constructions of BUVs imitating a fish and a seal are presented. Further, the results of thrust measurement for two different undulating propulsions are inserted. At the end of the paper containing conclusions from performed measurements and foreseen research is included.

Parole chiave

  • biomimetic underwater vehicle
  • undulating propulsion
  • thrust measurement
Accesso libero

Static Analysis of the Tubular Electromagnetic Linear Actuator with Permanents Magnets

Pubblicato online: 29 Jun 2018
Pagine: 83 - 95

Astratto

Abstract

In this paper a results of a static analysis of the tubular linear electromagnetic actuator is presented. The linear actuator consist of two parts: a cylindrical unmovable coils surrounded by a soft ferromagnetic case, and a runner made from sequence of permanent magnet with a soft ferro-magnetic gasket. In the first part of the paper the analytical method was performed for preliminary analysis. In the second part of the paper the more detailed analysis was depicted with using finite element method (FEM). The magnetic circuit shape and impact of selected dimensions on static characteristics is presented. Then the axial and radial electromagnetic force as a function of the runner dimensions were analysed.

Parole chiave

  • tubular electromagnetic linear actuator
  • permanent magnet linear actuator
  • computer simulation
  • finite element method

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