Rivista e Edizione

Volume 28 (2022): Edizione 3 (September 2022)

Volume 28 (2022): Edizione 2 (June 2022)

Volume 28 (2022): Edizione 1 (March 2022)

Volume 27 (2021): Edizione 4 (December 2021)

Volume 27 (2021): Edizione 3 (September 2021)

Volume 27 (2021): Edizione 2 (June 2021)

Volume 27 (2021): Edizione 1 (March 2021)

Volume 26 (2020): Edizione 4 (December 2020)

Volume 26 (2020): Edizione 3 (September 2020)

Volume 26 (2020): Edizione 2 (June 2020)

Volume 26 (2020): Edizione 1 (March 2020)

Volume 25 (2019): Edizione 25 (December 2019)

Volume 24 (2019): Edizione 24 (September 2019)

Volume 23 (2019): Edizione 23 (June 2019)

Volume 22 (2019): Edizione 22 (March 2019)

Volume 21 (2018): Edizione 21 (December 2018)

Volume 20 (2018): Edizione 20 (September 2018)

Volume 19 (2018): Edizione 19 (June 2018)

Volume 18 (2018): Edizione 18 (March 2018)

Volume 17 (2017): Edizione 17 (December 2017)

Volume 16 (2017): Edizione 16 (September 2017)

Volume 15 (2017): Edizione 15 (June 2017)

Volume 14 (2017): Edizione 14 (March 2017)

Dettagli della rivista
Formato
Rivista
eISSN
2353-7779
Pubblicato per la prima volta
30 Mar 2018
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

Volume 25 (2019): Edizione 25 (December 2019)

Dettagli della rivista
Formato
Rivista
eISSN
2353-7779
Pubblicato per la prima volta
30 Mar 2018
Periodo di pubblicazione
4 volte all'anno
Lingue
Inglese

Cerca

12 Articoli
Accesso libero

Mathematical and experimental study of deformations of a steel roll of a road roller with a variable geometry of a contact surface

Pubblicato online: 30 Dec 2019
Pagine: 1 - 7

Astratto

Abstract

The lack of a common methodology on compaction theory stimulates developers of road construction equipment to create various approximate methods for their calculation, the number of which, at the present time, is comparable with the nomenclature of the proposed designs of rollers. The article presents the analysis of the deformable shell behavior of a road roller, and the compacted material under its compacting roller, in a situation when a rigid circular shell of the roller is replaced by a forcefully deformable elliptical shape, which, unlike the circular design, allows variation, adjustment and optimization of the road roller impact on the material to be compacted.

Parole chiave

  • shell
  • road roller
  • drum
  • steel
  • stress
Accesso libero

Windshield Defrost Simplified CFD Model

Pubblicato online: 30 Dec 2019
Pagine: 8 - 11

Astratto

Abstract

The windshield defrost system, in general, is a vehicle safety feature. Thus, its restricted by variety of directives. However, the OMEs’ benchmark targets could be even more demanding as the deicing process is in addition also part of passengers comfort. From vehicle design point of view the wind-shield defrost system is typically connected to HVAC unit (Heating, Ventilation and Air Conditioning). In the technical solution the windshield is heated via hot air convection. Nevertheless, other methods are becoming more and more popular, like directly heated glass by hot wire ohmic heating (heated glasses). The defrost CFD model should predict the ice layer thickness in time and space and in environmental conditions defined according to appropriate directives and technical solution. The accurate and fast modelling technique is essential part of a vehicle development, especially nowadays, where the optimization techniques area widely used and requires hundreds of simulations runs. Modelling requests are even increasing with modern pure electric vehicles (EVs), were the thermal and energy management is more demanding compared to the classical internal combustion engine (ICE) vehicles. The aim of the work is to verify possibility to model the ice layer thickness with simplified approach, which could be beneficial from computational time burden.

Parole chiave

  • windshield defrost
  • CFD
  • ice layer thickness
  • VOF
  • Thin Film
Accesso libero

Analysis of the causes of control panel inconsistencies in the gravitational casting process by means of quality management instruments

Pubblicato online: 30 Dec 2019
Pagine: 12 - 16

Astratto

Abstract

All castings can have defects caused by, for example, deviations in material characteristics, structure or properties, but the skillful use of available technologies and quality management tools allows for the detection and elimination of casting incompatibilities as well as the prevention of their recurrence in the future. The aim of the article was to analyse the types of defects in castings, locate the areas with the most frequent occurrence of defects and identify the reasons for the presence of defects in castings of the control panel and its cover. The paper presents the usefulness of a combination of quality management instruments for diagnosing material discontinuities in the analyzed castings.

Parole chiave

  • Pareto-Lorenz diagram
  • brainstorm
  • Ishikawa diagram
  • quality tools
Accesso libero

Agricultural knowledge transfer: A case study for small farms and young farmers’ beneficiaries of European funds

Pubblicato online: 30 Dec 2019
Pagine: 17 - 20

Astratto

Abstract

Common Agricultural Policy represents the main instrument of the European Union for the development of agriculture and rural areas. European funds are vital for the productivity and competitiveness of agricultural holdings, as well as for the transfer of agricultural knowledge and innovation. Supporting small and young farms is essential for the vitality of rural areas and for the renewal of generations of farmers. The aim of this work is to transfer agricultural knowledge in order to improve the productivity of agricultural holdings, especially among young farmers and small farms. We implemented training program through European funds related to Measure 1. “Actions for knowledge transfer and information actions” from Rural Development Programme of Romania. The characteristic of 100 participants and their responses were analyzed. Most of the participants were young people up to 40 years old (59%). The vast majority of the participants were from the rural area and only 17% were from the urban area. 53% from participants were strongly agree with the fact that level of knowlegde influence farm productivity. Actions for knowledge transfer improve the adaptation of farmers to the new challenges of agriculture, as well as productivity.

Parole chiave

  • knowledge
  • European funds
  • productivity
  • young farmers
  • training
Accesso libero

Customer Journey Clue-based Service Failure Prevention

Pubblicato online: 30 Dec 2019
Pagine: 21 - 34

Astratto

Abstract

Customers and their perception towards service are considered as a determinant of service failure, and so, service failure and its prevention must be looked into from the perspective of the customers. This paper presents a customer-centric service failure prevention framework, which aims to provide a holistic way of service failure prevention by integrating service delivery assessment and failure analysis from a customer perspective, encompassing failure identification, assessment and prioritization of failures as a basis for corrective actions. Customer journey, service clues, and customer oriented-FMEA are employed to develop the proposed framework. The approach was applied to an enrolment process showing that using customer journey assists in determining customer processes, needs, wants and touch points in the service, and when used together with service clues further facilitates systematic and effective unveiling of potential failures that are important to customers. Assessment of failures and its prioritization with customer perspective leads to better prioritization that is reflective of the voice of customers. The case study shows that higher risk is imposed by actions emanating from the employees, reinforcing further that service failures not only concern functionality of the service but equally important also are the encounter of customers with service employees and the environment.

Parole chiave

  • customer-centric service failure prevention
  • customer journey
  • service clues
  • customer-oriented FMEA
Accesso libero

Cost and Safety Aspects of Using Electric and Hybrid Vehicles in Local Food Supply Chain

Pubblicato online: 30 Dec 2019
Pagine: 35 - 38

Astratto

Abstract

Integrating electric vehicles in a supply chain and distribution is a viable option when special conditions such as short distance road distribution and environmental considerations as well as small amounts of goods enabling delivery with delivery vans are met. In this paper, possibility of investment in electric vehicles for distribution of local food will be examined and analysed. Safety concerns in electric vehicles will also be addressed and accident consequences and vehicle safety will be analysed and compared with conventional vehicles that use internal combustion engines.

Parole chiave

  • electric vehicles
  • food supply
  • route planning
  • alternative fueled vehicles
Accesso libero

Comparison of the properties of the original and applied LDPE foils in returned bottles

Pubblicato online: 30 Dec 2019
Pagine: 39 - 42

Astratto

Abstract

A constant increase in the production of plastic products is a major cause of general environmental pollution. The past decade recognized how significant recycling plastic waste and the development of biodegradable materials is. This paper takes a new look at reducing the amount of plastic waste in the environment. Plastic bottles are “dressed” in a special PE (polyethylene) foil before filling. After the content is consumed, the foil is removed of the bottle. Such foil can be used for transporting other products more than once. The work focuses on the investigation of the changes in properties of the light density polyethylene (LDPE) foils caused by forming during their application to the bottle. It was decided that the optimal method for this investigation was to compare the mechanical and rheological properties PE foils before and after their application to the bottle.

Parole chiave

  • polyethylene foils
  • rheology
  • mechanical properties
Accesso libero

Influence of temperature on corrosion resistance of austenitic stainless steel in cl containing solutions

Pubblicato online: 30 Dec 2019
Pagine: 43 - 46

Astratto

Abstract

Temperature is considered a complicated external factor of the susceptibility of stainless steels to the pitting. This paper deals with the corrosion behaviour of AISI 316Ti stainless steel in temperature range 22 - 80°C in aggressive chloride environments (3 and 5% FeCl3 solutions). The corrosion resistance of tested steel is evaluated on the base of results of exposure immersion tests and cyclic potentiodynamic tests. According to the obtained results the resistance of AISI 316Ti to the pitting is markedly affected by temperature changes in the range 22 – 80°C. Intensity of corrosion attack increases with the rise of Cl concentration. Gentle changes of temperature and Cl concentration cause significant differences in character of local damage. The appearance of pitted surfaces changes with the rise of the temperature (a density of pitting increases, a size of pits decreases). The strongest change in appearance is observed between 40 and 50ºC.

Parole chiave

  • pitting corrosion
  • temperature
  • cyclic potentiodynamic test
  • immersion test
  • pitting potential
Accesso libero

The impact of the resolution of the measured object on the assessment of its perimeter

Pubblicato online: 30 Dec 2019
Pagine: 47 - 51

Astratto

Abstract

Automatic detection of objects is a part of visual systems supporting a quality control system of a manufacturing process. The paper concerns the influence of the resolution of images and the size of detected objects in pixels on measurements results. Test images of the objects of a known size were generated. The values of the perimeter of the objects were compared to the obtained values of measurements on the images with degraded resolution. The process of the degradation of the references images by successive downsizing the resolution, detection and measurements were performed applying automatic algorithm. The analysis of obtained results showed that the size of the analysed objects on the digital images plays an important role in reliability and accuracy of the measurement. The author concludes that, in order to avoid a bias in measurement caused by insufficient object resolution, the minimal acceptable size of objects on digital images in pixels should be recommended.

Parole chiave

  • digital measurements
  • resolution
  • image processing
  • stereology
Accesso libero

Investigation of tribological properties of CarbonX coating deposited on 100Cr6 steel

Pubblicato online: 30 Dec 2019
Pagine: 52 - 55

Astratto

Abstract

The article deals with a reduction of friction coefficient of bearing steel 100Cr6. Reduction of friction was achieved by means of a CarbonX DLC coating. The coating exhibited excellent friction and mechanical properties. This coating was applied to samples made of 100Cr6 bearing steel. The friction results of the CarbonX coating were compared to the friction results of the 100Cr6 bearing steel. Reducing the friction of 100Cr6 bearing steel resulted in reduced wear and increase lifetime. The friction process of the samples will take place in an environment without lubrication. The aim of the article is to verify the behaviour of the DLC coating without the presence of lubricant in the friction node. The achieved results are to be interpreted in the conclusion of article.

Parole chiave

  • tribology
  • DLC coating
  • 100Cr6 steel
  • friction
Accesso libero

Project-based Approach to Engineering Technology Education

Pubblicato online: 30 Dec 2019
Pagine: 56 - 59

Astratto

Abstract

The paper contains an overview of the history of engineering education in the United States. It also explains the differences between engineering and engineering technology from an historical perspective. The similarities and differences between those two programs are also being addressed. The article also explains the concept of the project-driven approach in teaching engineering technology courses. The procedure to secure and administer funding for the projects is also addressed. The paper also includes some practical guidelines for implementing a project-based approach.

Parole chiave

  • PBL
  • Education
  • Engineering
Accesso libero

Structure, Texture and Tensile Properties of Ti6Al4V Produced by Selective Laser Melting

Pubblicato online: 30 Dec 2019
Pagine: 60 - 65

Astratto

Abstract

Additive manufacturing has recently expanded its potential with the development of selective laser melting (SLM) of metallic powders. This study investigates the relation between the mechanical properties and the microstructure of Ti6Al4V alloy produced by SLM followed by a hot isostatic pressing (HIP) treatment. HIP treatment minimizes the detrimental influence of material defects. Tensile specimens produced with reference to specific building axes were prepared using a Renishaw A250 system. It has been found that the tensile strength and elongation depend on specimen building direction. Microstructural and textural characterizations were carried out to identify the source of differences.

Parole chiave

  • selective laser melting
  • Ti6Al4V
  • powder
  • structure
  • tensile test
12 Articoli
Accesso libero

Mathematical and experimental study of deformations of a steel roll of a road roller with a variable geometry of a contact surface

Pubblicato online: 30 Dec 2019
Pagine: 1 - 7

Astratto

Abstract

The lack of a common methodology on compaction theory stimulates developers of road construction equipment to create various approximate methods for their calculation, the number of which, at the present time, is comparable with the nomenclature of the proposed designs of rollers. The article presents the analysis of the deformable shell behavior of a road roller, and the compacted material under its compacting roller, in a situation when a rigid circular shell of the roller is replaced by a forcefully deformable elliptical shape, which, unlike the circular design, allows variation, adjustment and optimization of the road roller impact on the material to be compacted.

Parole chiave

  • shell
  • road roller
  • drum
  • steel
  • stress
Accesso libero

Windshield Defrost Simplified CFD Model

Pubblicato online: 30 Dec 2019
Pagine: 8 - 11

Astratto

Abstract

The windshield defrost system, in general, is a vehicle safety feature. Thus, its restricted by variety of directives. However, the OMEs’ benchmark targets could be even more demanding as the deicing process is in addition also part of passengers comfort. From vehicle design point of view the wind-shield defrost system is typically connected to HVAC unit (Heating, Ventilation and Air Conditioning). In the technical solution the windshield is heated via hot air convection. Nevertheless, other methods are becoming more and more popular, like directly heated glass by hot wire ohmic heating (heated glasses). The defrost CFD model should predict the ice layer thickness in time and space and in environmental conditions defined according to appropriate directives and technical solution. The accurate and fast modelling technique is essential part of a vehicle development, especially nowadays, where the optimization techniques area widely used and requires hundreds of simulations runs. Modelling requests are even increasing with modern pure electric vehicles (EVs), were the thermal and energy management is more demanding compared to the classical internal combustion engine (ICE) vehicles. The aim of the work is to verify possibility to model the ice layer thickness with simplified approach, which could be beneficial from computational time burden.

Parole chiave

  • windshield defrost
  • CFD
  • ice layer thickness
  • VOF
  • Thin Film
Accesso libero

Analysis of the causes of control panel inconsistencies in the gravitational casting process by means of quality management instruments

Pubblicato online: 30 Dec 2019
Pagine: 12 - 16

Astratto

Abstract

All castings can have defects caused by, for example, deviations in material characteristics, structure or properties, but the skillful use of available technologies and quality management tools allows for the detection and elimination of casting incompatibilities as well as the prevention of their recurrence in the future. The aim of the article was to analyse the types of defects in castings, locate the areas with the most frequent occurrence of defects and identify the reasons for the presence of defects in castings of the control panel and its cover. The paper presents the usefulness of a combination of quality management instruments for diagnosing material discontinuities in the analyzed castings.

Parole chiave

  • Pareto-Lorenz diagram
  • brainstorm
  • Ishikawa diagram
  • quality tools
Accesso libero

Agricultural knowledge transfer: A case study for small farms and young farmers’ beneficiaries of European funds

Pubblicato online: 30 Dec 2019
Pagine: 17 - 20

Astratto

Abstract

Common Agricultural Policy represents the main instrument of the European Union for the development of agriculture and rural areas. European funds are vital for the productivity and competitiveness of agricultural holdings, as well as for the transfer of agricultural knowledge and innovation. Supporting small and young farms is essential for the vitality of rural areas and for the renewal of generations of farmers. The aim of this work is to transfer agricultural knowledge in order to improve the productivity of agricultural holdings, especially among young farmers and small farms. We implemented training program through European funds related to Measure 1. “Actions for knowledge transfer and information actions” from Rural Development Programme of Romania. The characteristic of 100 participants and their responses were analyzed. Most of the participants were young people up to 40 years old (59%). The vast majority of the participants were from the rural area and only 17% were from the urban area. 53% from participants were strongly agree with the fact that level of knowlegde influence farm productivity. Actions for knowledge transfer improve the adaptation of farmers to the new challenges of agriculture, as well as productivity.

Parole chiave

  • knowledge
  • European funds
  • productivity
  • young farmers
  • training
Accesso libero

Customer Journey Clue-based Service Failure Prevention

Pubblicato online: 30 Dec 2019
Pagine: 21 - 34

Astratto

Abstract

Customers and their perception towards service are considered as a determinant of service failure, and so, service failure and its prevention must be looked into from the perspective of the customers. This paper presents a customer-centric service failure prevention framework, which aims to provide a holistic way of service failure prevention by integrating service delivery assessment and failure analysis from a customer perspective, encompassing failure identification, assessment and prioritization of failures as a basis for corrective actions. Customer journey, service clues, and customer oriented-FMEA are employed to develop the proposed framework. The approach was applied to an enrolment process showing that using customer journey assists in determining customer processes, needs, wants and touch points in the service, and when used together with service clues further facilitates systematic and effective unveiling of potential failures that are important to customers. Assessment of failures and its prioritization with customer perspective leads to better prioritization that is reflective of the voice of customers. The case study shows that higher risk is imposed by actions emanating from the employees, reinforcing further that service failures not only concern functionality of the service but equally important also are the encounter of customers with service employees and the environment.

Parole chiave

  • customer-centric service failure prevention
  • customer journey
  • service clues
  • customer-oriented FMEA
Accesso libero

Cost and Safety Aspects of Using Electric and Hybrid Vehicles in Local Food Supply Chain

Pubblicato online: 30 Dec 2019
Pagine: 35 - 38

Astratto

Abstract

Integrating electric vehicles in a supply chain and distribution is a viable option when special conditions such as short distance road distribution and environmental considerations as well as small amounts of goods enabling delivery with delivery vans are met. In this paper, possibility of investment in electric vehicles for distribution of local food will be examined and analysed. Safety concerns in electric vehicles will also be addressed and accident consequences and vehicle safety will be analysed and compared with conventional vehicles that use internal combustion engines.

Parole chiave

  • electric vehicles
  • food supply
  • route planning
  • alternative fueled vehicles
Accesso libero

Comparison of the properties of the original and applied LDPE foils in returned bottles

Pubblicato online: 30 Dec 2019
Pagine: 39 - 42

Astratto

Abstract

A constant increase in the production of plastic products is a major cause of general environmental pollution. The past decade recognized how significant recycling plastic waste and the development of biodegradable materials is. This paper takes a new look at reducing the amount of plastic waste in the environment. Plastic bottles are “dressed” in a special PE (polyethylene) foil before filling. After the content is consumed, the foil is removed of the bottle. Such foil can be used for transporting other products more than once. The work focuses on the investigation of the changes in properties of the light density polyethylene (LDPE) foils caused by forming during their application to the bottle. It was decided that the optimal method for this investigation was to compare the mechanical and rheological properties PE foils before and after their application to the bottle.

Parole chiave

  • polyethylene foils
  • rheology
  • mechanical properties
Accesso libero

Influence of temperature on corrosion resistance of austenitic stainless steel in cl containing solutions

Pubblicato online: 30 Dec 2019
Pagine: 43 - 46

Astratto

Abstract

Temperature is considered a complicated external factor of the susceptibility of stainless steels to the pitting. This paper deals with the corrosion behaviour of AISI 316Ti stainless steel in temperature range 22 - 80°C in aggressive chloride environments (3 and 5% FeCl3 solutions). The corrosion resistance of tested steel is evaluated on the base of results of exposure immersion tests and cyclic potentiodynamic tests. According to the obtained results the resistance of AISI 316Ti to the pitting is markedly affected by temperature changes in the range 22 – 80°C. Intensity of corrosion attack increases with the rise of Cl concentration. Gentle changes of temperature and Cl concentration cause significant differences in character of local damage. The appearance of pitted surfaces changes with the rise of the temperature (a density of pitting increases, a size of pits decreases). The strongest change in appearance is observed between 40 and 50ºC.

Parole chiave

  • pitting corrosion
  • temperature
  • cyclic potentiodynamic test
  • immersion test
  • pitting potential
Accesso libero

The impact of the resolution of the measured object on the assessment of its perimeter

Pubblicato online: 30 Dec 2019
Pagine: 47 - 51

Astratto

Abstract

Automatic detection of objects is a part of visual systems supporting a quality control system of a manufacturing process. The paper concerns the influence of the resolution of images and the size of detected objects in pixels on measurements results. Test images of the objects of a known size were generated. The values of the perimeter of the objects were compared to the obtained values of measurements on the images with degraded resolution. The process of the degradation of the references images by successive downsizing the resolution, detection and measurements were performed applying automatic algorithm. The analysis of obtained results showed that the size of the analysed objects on the digital images plays an important role in reliability and accuracy of the measurement. The author concludes that, in order to avoid a bias in measurement caused by insufficient object resolution, the minimal acceptable size of objects on digital images in pixels should be recommended.

Parole chiave

  • digital measurements
  • resolution
  • image processing
  • stereology
Accesso libero

Investigation of tribological properties of CarbonX coating deposited on 100Cr6 steel

Pubblicato online: 30 Dec 2019
Pagine: 52 - 55

Astratto

Abstract

The article deals with a reduction of friction coefficient of bearing steel 100Cr6. Reduction of friction was achieved by means of a CarbonX DLC coating. The coating exhibited excellent friction and mechanical properties. This coating was applied to samples made of 100Cr6 bearing steel. The friction results of the CarbonX coating were compared to the friction results of the 100Cr6 bearing steel. Reducing the friction of 100Cr6 bearing steel resulted in reduced wear and increase lifetime. The friction process of the samples will take place in an environment without lubrication. The aim of the article is to verify the behaviour of the DLC coating without the presence of lubricant in the friction node. The achieved results are to be interpreted in the conclusion of article.

Parole chiave

  • tribology
  • DLC coating
  • 100Cr6 steel
  • friction
Accesso libero

Project-based Approach to Engineering Technology Education

Pubblicato online: 30 Dec 2019
Pagine: 56 - 59

Astratto

Abstract

The paper contains an overview of the history of engineering education in the United States. It also explains the differences between engineering and engineering technology from an historical perspective. The similarities and differences between those two programs are also being addressed. The article also explains the concept of the project-driven approach in teaching engineering technology courses. The procedure to secure and administer funding for the projects is also addressed. The paper also includes some practical guidelines for implementing a project-based approach.

Parole chiave

  • PBL
  • Education
  • Engineering
Accesso libero

Structure, Texture and Tensile Properties of Ti6Al4V Produced by Selective Laser Melting

Pubblicato online: 30 Dec 2019
Pagine: 60 - 65

Astratto

Abstract

Additive manufacturing has recently expanded its potential with the development of selective laser melting (SLM) of metallic powders. This study investigates the relation between the mechanical properties and the microstructure of Ti6Al4V alloy produced by SLM followed by a hot isostatic pressing (HIP) treatment. HIP treatment minimizes the detrimental influence of material defects. Tensile specimens produced with reference to specific building axes were prepared using a Renishaw A250 system. It has been found that the tensile strength and elongation depend on specimen building direction. Microstructural and textural characterizations were carried out to identify the source of differences.

Parole chiave

  • selective laser melting
  • Ti6Al4V
  • powder
  • structure
  • tensile test

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