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Volume 29 (2021): Edizione 3 (September 2021)

Volume 29 (2021): Edizione 2 (June 2021)

Volume 29 (2021): Edizione 1 (March 2021)

Volume 28 (2020): Edizione 4 (December 2020)
Special Edizione: IMTech2020-INNOVATIVE MINING TECHNOLOGIES. Editors: Dariusz Prostański, Bartosz Polnik

Volume 28 (2020): Edizione 3 (September 2020)

Volume 28 (2020): Edizione 2 (June 2020)

Volume 28 (2020): Edizione 1 (March 2020)

Volume 27 (2019): Edizione 4 (December 2019)

Volume 27 (2019): Edizione 3 (September 2019)

Volume 27 (2019): Edizione 2 (June 2019)
Special Edizione: Technological Innovations in the Socio-Humanistic Context

Volume 27 (2019): Edizione 1 (March 2019)

Volume 26 (2018): Edizione 4 (December 2018)

Volume 26 (2018): Edizione 3 (September 2018)

Volume 26 (2018): Edizione 2 (June 2018)

Volume 26 (2018): Edizione 1 (March 2018)

Volume 25 (2017): Edizione 4 (December 2017)

Volume 25 (2017): Edizione 3 (September 2017)

Volume 25 (2017): Edizione 2 (June 2017)

Volume 25 (2017): Edizione 1 (March 2017)

Volume 24 (2016): Edizione 4 (December 2016)

Volume 23 (2016): Edizione 3 (September 2016)

Volume 22 (2016): Edizione 2 (June 2016)

Volume 21 (2016): Edizione 1 (March 2016)

Dettagli della rivista
Formato
Rivista
eISSN
2450-5781
Pubblicato per la prima volta
30 Mar 2017
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

Volume 25 (2017): Edizione 2 (June 2017)

Dettagli della rivista
Formato
Rivista
eISSN
2450-5781
Pubblicato per la prima volta
30 Mar 2017
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

10 Articoli
Accesso libero

The Application for a Prediction of the Coal Spontaneous Ignition – Predisam

Pubblicato online: 22 Apr 2017
Pagine: 81 - 87

Astratto

Abstract

The article follows the research of the project number TA01020351 called “The research of possibilities when predicting steam origin and consequent spontaneous ignition of brown coal fuels” which was researched with the support of the Technological Agency in the Czech Republic in 2011-2014 in the connection with a realized technical research. Therefore, it gives a summary information about the evaluation of the risk degree for the origin of spontaneous ignitions of the brown coal. The presented way of evaluation is based on a numeric expression of a value for MHU criteria - the point load of particular indicators is added together with other results gained from this research project. Then, more information is taken from companies running the dumps of brown coal products - both for suppliers (mining companies) and big consumers (power engineering). The complex knowledge about prediction of the origin of the spontaneous ignition enables to make an early response to eliminate a threat of mining fire in open pit mines or on the dumps of coal products. Consequently, it reduces the risk of fire and breakdowns of transportation means DPD, heavy machines and preparation plants. The working injuries are reduced as well - burns by coal in fire or inhalation of gas products from imperfect combustion.

Parole chiave

  • spontaneous ignition
  • brown coal
  • dumps
  • evaluation of prediction to spontaneous ignition
Accesso libero

Performance and Selectivity of Ceramic Membranes in the Ultrafiltration of Model Emulsion in Saline

Pubblicato online: 22 Apr 2017
Pagine: 88 - 92

Astratto

Abstract

Oily wastewaters from different onshore and offshore installations and from maritime transport pose a serious threat to the environment so they must be treated by multistage separation also including membrane processes. The main advantages of such membranes are high performance and selectivity, high resistance for temperature and pressure, resistance for acids, bases and solvents, long service life and for application - significant reduction of industries and transport environmental impact. This work presents the results of the process of separation of oil from the emulsion with NaCl addition. Research was performed with a use of laboratory installation with ceramic 300 kDa membrane. The analysis concerned performance and selectivity of a membrane in the function of time and test results have been subsequently compared with the requirements of the IMO.

Parole chiave

  • ceramic membranes
  • ultrafiltration
  • selectivity of membranes
  • oil emulsions
  • oily wastewaters
  • saline emulsions
  • bilge water
  • ballast water
Accesso libero

Diagnostics of Breakdown of Cutting Tools of Axial Cutting Head of the П110-04 Type Heading Machine

Pubblicato online: 22 Apr 2017
Pagine: 93 - 96

Astratto

Abstract

The operation of a heading machine with an out-of-work cutting tool can cause essential reduction of the machine element resource. The diagnostics of the cutting tool breakdown on the longitudinal axial cutting head in the real - time mode can be implemented on the basis of the spectral decomposition of the current of the cutting engine of the cutting unit. The ratio of the coefficients of the spectral decomposition corresponding to the cutting head rotation frequency and its threefold value can be the parameter under the diagnosis.

Parole chiave

  • heading machine
  • cutting unit
  • cutting-tool
  • abrasive wear
  • diagnostics
Accesso libero

Prediction of the Main Engine Power of a New Container Ship at the Preliminary Design Stage

Pubblicato online: 22 Apr 2017
Pagine: 97 - 99

Astratto

Abstract

The paper presents mathematical relationships that allow us to forecast the estimated main engine power of new container ships, based on data concerning vessels built in 2005-2015. The presented approximations allow us to estimate the engine power based on the length between perpendiculars and the number of containers the ship will carry. The approximations were developed using simple linear regression and multivariate linear regression analysis. The presented relations have practical application for estimation of container ship engine power needed in preliminary parametric design of the ship. It follows from the above that the use of multiple linear regression to predict the main engine power of a container ship brings more accurate solutions than simple linear regression.

Parole chiave

  • container ship
  • design parameters
  • preliminary design stage
  • power
  • main engine power
  • length between perpendiculars
  • number of containers
  • TEU capacity
  • design
  • simple regression
  • multiple regression
  • approximation
Accesso libero

The Problems of Maintenance of Drainage Devices Within Municipal and District Roads

Pubblicato online: 22 Apr 2017
Pagine: 100 - 104

Astratto

Abstract

The article presents technical aspects of maintenance of proper condition of drainage devices of public roads, and municipal and district roads in particular. The importance of road drainage is discussed, basic surface drainage devices discussed together with their location within the road. With use of actual examples we indicated the typical errors made during repairs and overhauls of the road, that have the consequence of disrupted continuity of drainage or the risk of quick loss of functions of drainage devices. The results of survey of technical condition of roadsides and the drainage device within a selected rural municipality were presented, indicating main problems of road keepers connected with keeping the drainage infrastructure in appropriate condition. The need of growing awareness in planning and designing road investment was indicated in the field of consequences of performing insufficient drainage.

Parole chiave

  • road drainage
  • maintenance of public roads
  • drainage devices
Accesso libero

Use of Water-Fuel Mixture in Diesel Engines at Fishing Vessels

Pubblicato online: 22 Apr 2017
Pagine: 105 - 109

Astratto

Abstract

The paper presents the laboratory test results determining physical parameters of fuel mixture made up of petroleum diesel oil, rapeseed oil methyl esters (up to 20%) and water (up to 2.5%). The obtained parameters prove that adding bio-components (rapeseed oil methyl esters) and water to fuel does not result in deterioration of their physical and chemical properties and are comparable to base fuel parameters, namely petroleum diesel oil. The mixture was a subject of bench testing with the use of a self-ignition engine by means of pre-catalytic fuel treatment. The treatment process consisted in fuel - catalytically active material direct contact on the atomizer body. At the comparable operational parameters for the engine, the obtained exhaust gases opacity was lower up to 60% due to the preliminary fuel mixture treatment in relation to the factory-made fuel injection system using petroleum diesel oil.

Parole chiave

  • diesel engine
  • preliminary fuel treatment
  • water-fuel mixture
Accesso libero

Technology of Producing the Contact Connections of Superconductor Metal-Sheathed Cable

Pubblicato online: 22 Apr 2017
Pagine: 110 - 119

Astratto

Abstract

The technology of producing the current contact connections on the superconductor cable edges is presented. This lead cable is used as one of the major elements of the magnetic system in thermonuclear reactor construction, actuality for modern world energy. The technology is realized by the radial draft of metal thin-walled tube on the conductor’s package. The filling of various profiles by round section wire is optimized. Geometrical characteristics of the dangerous crosssection (as a broken ring) of thin-walled tube injured by the sector cut-out are accounted. The comparative strength calculation of the solid and injured tubes at a longitudinal compression and lateral bending is acted. The radial draft mechanism of cylindrical thin-walled sheath with the wire packing is designed. The necessity to use the nonlinear theory for the sheaths calculate is set. The resilient co-operation of wires as the parallel located cylinders with the contact stripes of rectangular form is considered.

Parole chiave

  • superconductor cable
  • contact connection
  • wire
  • packing
  • thin-walled tube
  • radial draft
  • contact
Accesso libero

Rational Increasing of Energy Efficiency of Sacral Buildings

Pubblicato online: 22 Apr 2017
Pagine: 120 - 124

Astratto

Abstract

The paper presents the possibilities of increasing energy efficiency of sacral buildings. Churches in the Zawiercie pastoral district of the Archdiocese of Czestochowa have been used as examples of typical sacral buildings of low energy efficiency. Such structures need to be thermally insulated during their use. Certain possibilities of raising the energy efficiency of churches have been presented. The paper describes different systems: increasing of wall and roof insulation, installation of new windows, and modern heating systems. Installation of a new heating system has been considered the most effective and the easiest to be implemented one.

Parole chiave

  • sacralbuildings
  • church buildings
  • thermal insulation
  • heating systems
Accesso libero

Prediction Power Propulsion of the Ship at the Stage of Preliminary Design. Part I: Forecasting Method for Power Propulsion of Ship at the Stage of Preliminary Design

Pubblicato online: 22 Apr 2017
Pagine: 125 - 130

Astratto

Abstract

During the design of the ship the most important decisions are made at the stage of preliminary design. One of the most important design parameters assumed by the shipowner is its service speed in real weather conditions occurring in the shipping line. For this speed, at the stage of preliminary design, when are known only to the basic geometric parameters of the ship and its motor power should be determined. In practice, design, power propulsion is determined with a very approximate formulas but for the speed in calm water. Only after the project contract and the signing of the contract are carried out by means of resistance and self-propulsion of model test. The article presents the concept of the method for determining the power propulsion for the assumed service speed, which depends only on the basic geometric parameters of the ship’s hull.

Parole chiave

  • power propulsion
  • service speed
  • preliminary design
Accesso libero

Modeling of Surface Geometric Structure State After Integratedformed Milling and Finish Burnishing

Pubblicato online: 22 Apr 2017
Pagine: 131 - 136

Astratto

Abstract

The article deals with computer-based modeling of burnishing a surface previously milled with a spherical cutter. This method of milling leaves traces, mainly asperities caused by the cutting crossfeed and cutter diameter. The burnishing process - surface plastic treatment - is accompanied by phenomena that take place right in the burnishing ball-milled surface contact zone. The authors present the method for preparing a finite element model and the methodology of tests for the assessment of height parameters of a surface geometrical structure (SGS). In the physical model the workpieces had a cuboidal shape and these dimensions: (width × height × length) 2×1×4.5 mm. As in the process of burnishing a cuboidal workpiece is affected by plastic deformations, the nonlinearities of the milled item were taken into account. The physical model of the process assumed that the burnishing ball would be rolled perpendicularly to milling cutter linear traces. The model tests included the application of three different burnishing forces: 250 N, 500 N and 1000 N. The process modeling featured the contact and pressing of a ball into the workpiece surface till the desired force was attained, then the burnishing ball was rolled along the surface section of 2 mm, and the burnishing force was gradually reduced till the ball left the contact zone. While rolling, the burnishing ball turned by a 23° angle. The cumulative diagrams depict plastic deformations of the modeled surfaces after milling and burnishing with defined force values. The roughness of idealized milled surface was calculated for the physical model under consideration, i.e. in an elementary section between profile peaks spaced at intervals of crossfeed passes, where the milling feed fwm = 0.5 mm. Also, asperities after burnishing were calculated for the same section. The differences of the obtained values fall below 20% of mean values recorded during empirical experiments. The adopted simplification in after-milling SGS modeling enables substantial acceleration of the computing process. There is a visible reduction of the Ra parameter value for milled and burnished surfaces as the burnishing force rises. The tests determined an optimal burnishing force at a level of 500 N (lowest Ra = 0.24 μm). Further increase in the value of burnishing force turned out not to affect the surface roughness, which is consistent with the results obtained from experimental studies.

Parole chiave

  • Surface geometric structure
  • milling
  • burnishing
  • hybrid machining
  • FEM modeling
10 Articoli
Accesso libero

The Application for a Prediction of the Coal Spontaneous Ignition – Predisam

Pubblicato online: 22 Apr 2017
Pagine: 81 - 87

Astratto

Abstract

The article follows the research of the project number TA01020351 called “The research of possibilities when predicting steam origin and consequent spontaneous ignition of brown coal fuels” which was researched with the support of the Technological Agency in the Czech Republic in 2011-2014 in the connection with a realized technical research. Therefore, it gives a summary information about the evaluation of the risk degree for the origin of spontaneous ignitions of the brown coal. The presented way of evaluation is based on a numeric expression of a value for MHU criteria - the point load of particular indicators is added together with other results gained from this research project. Then, more information is taken from companies running the dumps of brown coal products - both for suppliers (mining companies) and big consumers (power engineering). The complex knowledge about prediction of the origin of the spontaneous ignition enables to make an early response to eliminate a threat of mining fire in open pit mines or on the dumps of coal products. Consequently, it reduces the risk of fire and breakdowns of transportation means DPD, heavy machines and preparation plants. The working injuries are reduced as well - burns by coal in fire or inhalation of gas products from imperfect combustion.

Parole chiave

  • spontaneous ignition
  • brown coal
  • dumps
  • evaluation of prediction to spontaneous ignition
Accesso libero

Performance and Selectivity of Ceramic Membranes in the Ultrafiltration of Model Emulsion in Saline

Pubblicato online: 22 Apr 2017
Pagine: 88 - 92

Astratto

Abstract

Oily wastewaters from different onshore and offshore installations and from maritime transport pose a serious threat to the environment so they must be treated by multistage separation also including membrane processes. The main advantages of such membranes are high performance and selectivity, high resistance for temperature and pressure, resistance for acids, bases and solvents, long service life and for application - significant reduction of industries and transport environmental impact. This work presents the results of the process of separation of oil from the emulsion with NaCl addition. Research was performed with a use of laboratory installation with ceramic 300 kDa membrane. The analysis concerned performance and selectivity of a membrane in the function of time and test results have been subsequently compared with the requirements of the IMO.

Parole chiave

  • ceramic membranes
  • ultrafiltration
  • selectivity of membranes
  • oil emulsions
  • oily wastewaters
  • saline emulsions
  • bilge water
  • ballast water
Accesso libero

Diagnostics of Breakdown of Cutting Tools of Axial Cutting Head of the П110-04 Type Heading Machine

Pubblicato online: 22 Apr 2017
Pagine: 93 - 96

Astratto

Abstract

The operation of a heading machine with an out-of-work cutting tool can cause essential reduction of the machine element resource. The diagnostics of the cutting tool breakdown on the longitudinal axial cutting head in the real - time mode can be implemented on the basis of the spectral decomposition of the current of the cutting engine of the cutting unit. The ratio of the coefficients of the spectral decomposition corresponding to the cutting head rotation frequency and its threefold value can be the parameter under the diagnosis.

Parole chiave

  • heading machine
  • cutting unit
  • cutting-tool
  • abrasive wear
  • diagnostics
Accesso libero

Prediction of the Main Engine Power of a New Container Ship at the Preliminary Design Stage

Pubblicato online: 22 Apr 2017
Pagine: 97 - 99

Astratto

Abstract

The paper presents mathematical relationships that allow us to forecast the estimated main engine power of new container ships, based on data concerning vessels built in 2005-2015. The presented approximations allow us to estimate the engine power based on the length between perpendiculars and the number of containers the ship will carry. The approximations were developed using simple linear regression and multivariate linear regression analysis. The presented relations have practical application for estimation of container ship engine power needed in preliminary parametric design of the ship. It follows from the above that the use of multiple linear regression to predict the main engine power of a container ship brings more accurate solutions than simple linear regression.

Parole chiave

  • container ship
  • design parameters
  • preliminary design stage
  • power
  • main engine power
  • length between perpendiculars
  • number of containers
  • TEU capacity
  • design
  • simple regression
  • multiple regression
  • approximation
Accesso libero

The Problems of Maintenance of Drainage Devices Within Municipal and District Roads

Pubblicato online: 22 Apr 2017
Pagine: 100 - 104

Astratto

Abstract

The article presents technical aspects of maintenance of proper condition of drainage devices of public roads, and municipal and district roads in particular. The importance of road drainage is discussed, basic surface drainage devices discussed together with their location within the road. With use of actual examples we indicated the typical errors made during repairs and overhauls of the road, that have the consequence of disrupted continuity of drainage or the risk of quick loss of functions of drainage devices. The results of survey of technical condition of roadsides and the drainage device within a selected rural municipality were presented, indicating main problems of road keepers connected with keeping the drainage infrastructure in appropriate condition. The need of growing awareness in planning and designing road investment was indicated in the field of consequences of performing insufficient drainage.

Parole chiave

  • road drainage
  • maintenance of public roads
  • drainage devices
Accesso libero

Use of Water-Fuel Mixture in Diesel Engines at Fishing Vessels

Pubblicato online: 22 Apr 2017
Pagine: 105 - 109

Astratto

Abstract

The paper presents the laboratory test results determining physical parameters of fuel mixture made up of petroleum diesel oil, rapeseed oil methyl esters (up to 20%) and water (up to 2.5%). The obtained parameters prove that adding bio-components (rapeseed oil methyl esters) and water to fuel does not result in deterioration of their physical and chemical properties and are comparable to base fuel parameters, namely petroleum diesel oil. The mixture was a subject of bench testing with the use of a self-ignition engine by means of pre-catalytic fuel treatment. The treatment process consisted in fuel - catalytically active material direct contact on the atomizer body. At the comparable operational parameters for the engine, the obtained exhaust gases opacity was lower up to 60% due to the preliminary fuel mixture treatment in relation to the factory-made fuel injection system using petroleum diesel oil.

Parole chiave

  • diesel engine
  • preliminary fuel treatment
  • water-fuel mixture
Accesso libero

Technology of Producing the Contact Connections of Superconductor Metal-Sheathed Cable

Pubblicato online: 22 Apr 2017
Pagine: 110 - 119

Astratto

Abstract

The technology of producing the current contact connections on the superconductor cable edges is presented. This lead cable is used as one of the major elements of the magnetic system in thermonuclear reactor construction, actuality for modern world energy. The technology is realized by the radial draft of metal thin-walled tube on the conductor’s package. The filling of various profiles by round section wire is optimized. Geometrical characteristics of the dangerous crosssection (as a broken ring) of thin-walled tube injured by the sector cut-out are accounted. The comparative strength calculation of the solid and injured tubes at a longitudinal compression and lateral bending is acted. The radial draft mechanism of cylindrical thin-walled sheath with the wire packing is designed. The necessity to use the nonlinear theory for the sheaths calculate is set. The resilient co-operation of wires as the parallel located cylinders with the contact stripes of rectangular form is considered.

Parole chiave

  • superconductor cable
  • contact connection
  • wire
  • packing
  • thin-walled tube
  • radial draft
  • contact
Accesso libero

Rational Increasing of Energy Efficiency of Sacral Buildings

Pubblicato online: 22 Apr 2017
Pagine: 120 - 124

Astratto

Abstract

The paper presents the possibilities of increasing energy efficiency of sacral buildings. Churches in the Zawiercie pastoral district of the Archdiocese of Czestochowa have been used as examples of typical sacral buildings of low energy efficiency. Such structures need to be thermally insulated during their use. Certain possibilities of raising the energy efficiency of churches have been presented. The paper describes different systems: increasing of wall and roof insulation, installation of new windows, and modern heating systems. Installation of a new heating system has been considered the most effective and the easiest to be implemented one.

Parole chiave

  • sacralbuildings
  • church buildings
  • thermal insulation
  • heating systems
Accesso libero

Prediction Power Propulsion of the Ship at the Stage of Preliminary Design. Part I: Forecasting Method for Power Propulsion of Ship at the Stage of Preliminary Design

Pubblicato online: 22 Apr 2017
Pagine: 125 - 130

Astratto

Abstract

During the design of the ship the most important decisions are made at the stage of preliminary design. One of the most important design parameters assumed by the shipowner is its service speed in real weather conditions occurring in the shipping line. For this speed, at the stage of preliminary design, when are known only to the basic geometric parameters of the ship and its motor power should be determined. In practice, design, power propulsion is determined with a very approximate formulas but for the speed in calm water. Only after the project contract and the signing of the contract are carried out by means of resistance and self-propulsion of model test. The article presents the concept of the method for determining the power propulsion for the assumed service speed, which depends only on the basic geometric parameters of the ship’s hull.

Parole chiave

  • power propulsion
  • service speed
  • preliminary design
Accesso libero

Modeling of Surface Geometric Structure State After Integratedformed Milling and Finish Burnishing

Pubblicato online: 22 Apr 2017
Pagine: 131 - 136

Astratto

Abstract

The article deals with computer-based modeling of burnishing a surface previously milled with a spherical cutter. This method of milling leaves traces, mainly asperities caused by the cutting crossfeed and cutter diameter. The burnishing process - surface plastic treatment - is accompanied by phenomena that take place right in the burnishing ball-milled surface contact zone. The authors present the method for preparing a finite element model and the methodology of tests for the assessment of height parameters of a surface geometrical structure (SGS). In the physical model the workpieces had a cuboidal shape and these dimensions: (width × height × length) 2×1×4.5 mm. As in the process of burnishing a cuboidal workpiece is affected by plastic deformations, the nonlinearities of the milled item were taken into account. The physical model of the process assumed that the burnishing ball would be rolled perpendicularly to milling cutter linear traces. The model tests included the application of three different burnishing forces: 250 N, 500 N and 1000 N. The process modeling featured the contact and pressing of a ball into the workpiece surface till the desired force was attained, then the burnishing ball was rolled along the surface section of 2 mm, and the burnishing force was gradually reduced till the ball left the contact zone. While rolling, the burnishing ball turned by a 23° angle. The cumulative diagrams depict plastic deformations of the modeled surfaces after milling and burnishing with defined force values. The roughness of idealized milled surface was calculated for the physical model under consideration, i.e. in an elementary section between profile peaks spaced at intervals of crossfeed passes, where the milling feed fwm = 0.5 mm. Also, asperities after burnishing were calculated for the same section. The differences of the obtained values fall below 20% of mean values recorded during empirical experiments. The adopted simplification in after-milling SGS modeling enables substantial acceleration of the computing process. There is a visible reduction of the Ra parameter value for milled and burnished surfaces as the burnishing force rises. The tests determined an optimal burnishing force at a level of 500 N (lowest Ra = 0.24 μm). Further increase in the value of burnishing force turned out not to affect the surface roughness, which is consistent with the results obtained from experimental studies.

Parole chiave

  • Surface geometric structure
  • milling
  • burnishing
  • hybrid machining
  • FEM modeling

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