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Journal Details
Format
Journal
eISSN
2083-4608
ISSN
1895-8281
First Published
26 Feb 2008
Publication timeframe
4 times per year
Languages
English

Search

Volume 9-10 (2009): Issue 1 (January 2009)

Journal Details
Format
Journal
eISSN
2083-4608
ISSN
1895-8281
First Published
26 Feb 2008
Publication timeframe
4 times per year
Languages
English

Search

8 Articles
Open Access

A Method of Parametric Evaluation of The Technical Object Reliability

Published Online: 25 Aug 2010
Page range: 1 - 22

Abstract

A Method of Parametric Evaluation of The Technical Object Reliability

This work presents a practical and effective method to evaluate the reliability status of an object basing on the observation of changes in its functioning (automatics) and its technical condition (diagnostics). It has been observed that changes of the functioning condition potential could serve to determine the symptoms of transient (momentary) damages and the changes in the potential of the technical condition to determine the symptoms of parametric damages (non-total). Such an information, as it turns out, is sufficient to calculate reliability characteristics before dangerous catastrophic damages occur and to calculate reliability characteristics for every single object without having to deal with a numerous set of objects. The presented computer-aided method can be of a substantial practical importance in coordination of adjusting/control functions, diagnostics and reliability actions and thanks to that it can improve the level of organisation of a system operation.

Keywords

  • reliability
  • diagnostic
Open Access

A Synthetic Method for Examination of Potential Reliability and Safety Level Demonstrated by Technical Facilities During Their Lifetime

Published Online: 25 Aug 2010
Page range: 23 - 34

Abstract

A Synthetic Method for Examination of Potential Reliability and Safety Level Demonstrated by Technical Facilities During Their Lifetime

The paper presents fundamentals for an innovative method that takes advantage of diagnostic information defined with participation of an expert. (presented as a score of points). Defined number of points is assigned to each signal change, depending on the signal value and the moment when the change occurs, whilst the number of points is preliminary defined by an expert. The proposed innovative method consists in the use of signals represented by the scores to determine combined status equations [3, 5] for parameters of the adjustment control state and technical state (equations 3 and 4) and then parameters of reliability and safety (equations 5 and 6). Such an approach enables continuous monitoring of the reliability and safety states of facilities during their lifetime. The presented approach may prove to be extremely useful as it unambiguously presents wear and tear of the facilities and enables to predict when the facilities should be repaired (overhauled).

Keywords

  • diagnostic
  • safety
  • reliability
Open Access

Economizer Selection Method with Reference to its Reliability at Preliminary Design Stage of Seagoing Vessels

Published Online: 25 Aug 2010
Page range: 35 - 44

Abstract

Economizer Selection Method with Reference to its Reliability at Preliminary Design Stage of Seagoing Vessels

The economizers are used for production of steam heating on en route ships. The economizers are producing steam in a heat exchange process from the ship's main engine exhaust gas. Products of the incomplete combustion of the heavy fuel oil remaining in engines, passing the boiler, collect on the heat exchange surface of the economizer. When the incorrect assumptions are made for the boiler operation conditions, the boiler steam capacity drops and fire and burning of the incomplete combustion products can occur in the economizer. To minimize combustion product quantity that collects on the boiler surface, the allowable exhaust gas pressure drop in the boiler should be taken into consideration, as well as the results from recommended exhaust gas flow velocity that is determined by main engine service load determined in the preliminary design phase of the ship. The remaining operating conditions are made in such a way to obtain high steam capacity of the boiler. It is essential at the design stage to take into consideration the future operating parameters of the combustion-steam-water installation, since these parameters depend on the choice of boiler and determined at the design stage production of steam. On the basis of operation parameters of contemporary container ships, an attempt was made to select economizer capacity in the preliminary design stage taking into consideration operation conditions of the propulsion system-steam installations unit in aspect of economizer reliability.

Keywords

  • seagoing ships
  • economizer
  • steam boiler
  • steam capacity
  • reliability
  • operating conditions
Open Access

The Use of Expert System for Marine Diesel Engine Diagnosis

Published Online: 25 Aug 2010
Page range: 45 - 56

Abstract

The Use of Expert System for Marine Diesel Engine Diagnosis

The paper presents a diagnostic system for marine diesel engine based on an expert system model. The research relevant to knowledge acquisition for this system was done, knowledge data set was built and general structures of the expert system was proposed. Basic sources of knowledge which can be used for construction of knowledge data set are also identified. The basic knowledge related to the diesel diagnostic was undertaken from experts and diagnostic data base. The paper questionnaire was used to the knowledge acquisition from experts. The basic knowledge related to the marine diesel exploitation was undertaken. The rule induction algorithms was used to knowledge acquisition from data base. During the experiment efficiency of LEM induction algorithms was compared to new MODLEM and EXPLORE algorithms. Training and test data were acquired from experiment on marine engine Sulzer 3AL 25/30.

Keywords

  • technical diagnostic
  • expert system
  • marine diesel engines
Open Access

The Influence of Burnishing Parameters on the Roughness, Plastic Strain and Shape Deviations of Marine Pumps Crankshaft Pins in Fresh Water Installations

Published Online: 25 Aug 2010
Page range: 57 - 66

Abstract

The Influence of Burnishing Parameters on the Roughness, Plastic Strain and Shape Deviations of Marine Pumps Crankshaft Pins in Fresh Water Installations

Angular momentum pumps are frequently applied in marine installations. Due to hard working conditions of these pumps, special corrosion wear resistant materials as well as the ones resistant to electrochemical corrosion caused by sea water are used for their production. In case of pump shafts the most frequent inefficiency is the pin wear (corrosive wear, friction wear and contact wear) in place of sealings assembly (throttle). Burnishing as finish plastic tooling method enables obtaining machine elements of proper technological quality. Bearing in mind numerous advantages of using burnishing, it is suggested to apply it instead of machining (finish turning, grinding, polishing) to the shafts of marine angular momentum pumps.

The burnishing process was carried out by SRMD single roll burnishing tool by Yamato. The object of the paper was to determine the influence of burnishing parameters and the number of burnishing tool passes on the improvement of roughness, plastic deformation and the shape deviation of marine pumps crank pins.

Keywords

  • burnishing
  • surface layer
  • stainless steel
  • angular momentum pump
Open Access

The Analisys of Elements Decided of Ship's Movement during Strike on Ground

Published Online: 25 Aug 2010
Page range: 67 - 76

Abstract

The Analisys of Elements Decided of Ship's Movement during Strike on Ground

The main goal of navigation is to handle the ship in accordance with the basic aim, which should be executed. The port water areas are one of especially, where risk of navigation accident is high. The safety of manoeuvring ship on port water area depends mainly on under-keel clearance (UKC). The paper presents the analysis of elements, which determine the movement of ship during strike on ground.

Keywords

  • safety of navigation
  • under keel clearance
  • ship's strike on sea bottom
Open Access

Assessment of Situation in Case of Ships Impact to Sea Bed

Published Online: 25 Aug 2010
Page range: 77 - 86

Abstract

Assessment of Situation in Case of Ships Impact to Sea Bed

The under-keel clearance (UKC) of a ship in the port water area should be such that a ship moves safely. In some specific conditions it happen the ship impact the sea bottom. The undesired strike against the ground can damage the ship hull, but in many cases it has not happened. It depends on relation between of ships movement parameters and ground feature. The paper presents the assessment of damage possibility of ship's hull and algorithm of calculation of ships movement parameters during contact with sea bed.

Keywords

  • safety of navigation
  • under keel clearance
  • ships impact to sea bed
  • damage of ship's hull
Open Access

The Fuzzy Robust Anti-Sway Crane Control System

Published Online: 25 Aug 2010
Page range: 87 - 98

Abstract

The Fuzzy Robust Anti-Sway Crane Control System

The paper presents the pole placement approach to solve problem of conventional, based of proportional-derivative controllers, as well as robust, based of fuzzy controller, anti-sway crane control. The methods of robust gain-scheduling crane control system and selecting minimal set of operating points were shown. The fuzzy robust controller, based of Takagi-Sugeno-Kang inference system, was presented, as well as results of experiments, carried out using laboratory model of an overhead traveling crane, were shown in the paper.

Keywords

  • crane
  • robust control
  • fuzzy logic
8 Articles
Open Access

A Method of Parametric Evaluation of The Technical Object Reliability

Published Online: 25 Aug 2010
Page range: 1 - 22

Abstract

A Method of Parametric Evaluation of The Technical Object Reliability

This work presents a practical and effective method to evaluate the reliability status of an object basing on the observation of changes in its functioning (automatics) and its technical condition (diagnostics). It has been observed that changes of the functioning condition potential could serve to determine the symptoms of transient (momentary) damages and the changes in the potential of the technical condition to determine the symptoms of parametric damages (non-total). Such an information, as it turns out, is sufficient to calculate reliability characteristics before dangerous catastrophic damages occur and to calculate reliability characteristics for every single object without having to deal with a numerous set of objects. The presented computer-aided method can be of a substantial practical importance in coordination of adjusting/control functions, diagnostics and reliability actions and thanks to that it can improve the level of organisation of a system operation.

Keywords

  • reliability
  • diagnostic
Open Access

A Synthetic Method for Examination of Potential Reliability and Safety Level Demonstrated by Technical Facilities During Their Lifetime

Published Online: 25 Aug 2010
Page range: 23 - 34

Abstract

A Synthetic Method for Examination of Potential Reliability and Safety Level Demonstrated by Technical Facilities During Their Lifetime

The paper presents fundamentals for an innovative method that takes advantage of diagnostic information defined with participation of an expert. (presented as a score of points). Defined number of points is assigned to each signal change, depending on the signal value and the moment when the change occurs, whilst the number of points is preliminary defined by an expert. The proposed innovative method consists in the use of signals represented by the scores to determine combined status equations [3, 5] for parameters of the adjustment control state and technical state (equations 3 and 4) and then parameters of reliability and safety (equations 5 and 6). Such an approach enables continuous monitoring of the reliability and safety states of facilities during their lifetime. The presented approach may prove to be extremely useful as it unambiguously presents wear and tear of the facilities and enables to predict when the facilities should be repaired (overhauled).

Keywords

  • diagnostic
  • safety
  • reliability
Open Access

Economizer Selection Method with Reference to its Reliability at Preliminary Design Stage of Seagoing Vessels

Published Online: 25 Aug 2010
Page range: 35 - 44

Abstract

Economizer Selection Method with Reference to its Reliability at Preliminary Design Stage of Seagoing Vessels

The economizers are used for production of steam heating on en route ships. The economizers are producing steam in a heat exchange process from the ship's main engine exhaust gas. Products of the incomplete combustion of the heavy fuel oil remaining in engines, passing the boiler, collect on the heat exchange surface of the economizer. When the incorrect assumptions are made for the boiler operation conditions, the boiler steam capacity drops and fire and burning of the incomplete combustion products can occur in the economizer. To minimize combustion product quantity that collects on the boiler surface, the allowable exhaust gas pressure drop in the boiler should be taken into consideration, as well as the results from recommended exhaust gas flow velocity that is determined by main engine service load determined in the preliminary design phase of the ship. The remaining operating conditions are made in such a way to obtain high steam capacity of the boiler. It is essential at the design stage to take into consideration the future operating parameters of the combustion-steam-water installation, since these parameters depend on the choice of boiler and determined at the design stage production of steam. On the basis of operation parameters of contemporary container ships, an attempt was made to select economizer capacity in the preliminary design stage taking into consideration operation conditions of the propulsion system-steam installations unit in aspect of economizer reliability.

Keywords

  • seagoing ships
  • economizer
  • steam boiler
  • steam capacity
  • reliability
  • operating conditions
Open Access

The Use of Expert System for Marine Diesel Engine Diagnosis

Published Online: 25 Aug 2010
Page range: 45 - 56

Abstract

The Use of Expert System for Marine Diesel Engine Diagnosis

The paper presents a diagnostic system for marine diesel engine based on an expert system model. The research relevant to knowledge acquisition for this system was done, knowledge data set was built and general structures of the expert system was proposed. Basic sources of knowledge which can be used for construction of knowledge data set are also identified. The basic knowledge related to the diesel diagnostic was undertaken from experts and diagnostic data base. The paper questionnaire was used to the knowledge acquisition from experts. The basic knowledge related to the marine diesel exploitation was undertaken. The rule induction algorithms was used to knowledge acquisition from data base. During the experiment efficiency of LEM induction algorithms was compared to new MODLEM and EXPLORE algorithms. Training and test data were acquired from experiment on marine engine Sulzer 3AL 25/30.

Keywords

  • technical diagnostic
  • expert system
  • marine diesel engines
Open Access

The Influence of Burnishing Parameters on the Roughness, Plastic Strain and Shape Deviations of Marine Pumps Crankshaft Pins in Fresh Water Installations

Published Online: 25 Aug 2010
Page range: 57 - 66

Abstract

The Influence of Burnishing Parameters on the Roughness, Plastic Strain and Shape Deviations of Marine Pumps Crankshaft Pins in Fresh Water Installations

Angular momentum pumps are frequently applied in marine installations. Due to hard working conditions of these pumps, special corrosion wear resistant materials as well as the ones resistant to electrochemical corrosion caused by sea water are used for their production. In case of pump shafts the most frequent inefficiency is the pin wear (corrosive wear, friction wear and contact wear) in place of sealings assembly (throttle). Burnishing as finish plastic tooling method enables obtaining machine elements of proper technological quality. Bearing in mind numerous advantages of using burnishing, it is suggested to apply it instead of machining (finish turning, grinding, polishing) to the shafts of marine angular momentum pumps.

The burnishing process was carried out by SRMD single roll burnishing tool by Yamato. The object of the paper was to determine the influence of burnishing parameters and the number of burnishing tool passes on the improvement of roughness, plastic deformation and the shape deviation of marine pumps crank pins.

Keywords

  • burnishing
  • surface layer
  • stainless steel
  • angular momentum pump
Open Access

The Analisys of Elements Decided of Ship's Movement during Strike on Ground

Published Online: 25 Aug 2010
Page range: 67 - 76

Abstract

The Analisys of Elements Decided of Ship's Movement during Strike on Ground

The main goal of navigation is to handle the ship in accordance with the basic aim, which should be executed. The port water areas are one of especially, where risk of navigation accident is high. The safety of manoeuvring ship on port water area depends mainly on under-keel clearance (UKC). The paper presents the analysis of elements, which determine the movement of ship during strike on ground.

Keywords

  • safety of navigation
  • under keel clearance
  • ship's strike on sea bottom
Open Access

Assessment of Situation in Case of Ships Impact to Sea Bed

Published Online: 25 Aug 2010
Page range: 77 - 86

Abstract

Assessment of Situation in Case of Ships Impact to Sea Bed

The under-keel clearance (UKC) of a ship in the port water area should be such that a ship moves safely. In some specific conditions it happen the ship impact the sea bottom. The undesired strike against the ground can damage the ship hull, but in many cases it has not happened. It depends on relation between of ships movement parameters and ground feature. The paper presents the assessment of damage possibility of ship's hull and algorithm of calculation of ships movement parameters during contact with sea bed.

Keywords

  • safety of navigation
  • under keel clearance
  • ships impact to sea bed
  • damage of ship's hull
Open Access

The Fuzzy Robust Anti-Sway Crane Control System

Published Online: 25 Aug 2010
Page range: 87 - 98

Abstract

The Fuzzy Robust Anti-Sway Crane Control System

The paper presents the pole placement approach to solve problem of conventional, based of proportional-derivative controllers, as well as robust, based of fuzzy controller, anti-sway crane control. The methods of robust gain-scheduling crane control system and selecting minimal set of operating points were shown. The fuzzy robust controller, based of Takagi-Sugeno-Kang inference system, was presented, as well as results of experiments, carried out using laboratory model of an overhead traveling crane, were shown in the paper.

Keywords

  • crane
  • robust control
  • fuzzy logic

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