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Semiquantum authentication of users resistant to multisession attacks

Piotr Zawadzki

Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 4 | e137729 | DOI: 10.24425/bpasts.2021.137729

Keywords quantum cryptography quantum identity authentication semi-quantum communication

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Abstract

User authentication is an essential element of any communication system. The paper investigates the vulnerability of the recently published first semiquantum identity authentication protocol (Quantum Information Processing 18: 197, 2019) to the introduced herein multisession attacks. The impersonation of the legitimate parties by a proper combination of phishing techniques is demonstrated. The improved version that closes the identified loophole is also introduced

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Authors and Affiliations

Piotr Zawadzki

1

e-mail:

ORCID:

Department of Telecommunications and Teleinformatics, Silesian University of Technology, ul. Akademicka 2A, 44-100 Gliwice, Poland

Anisotropy of structural and mechanical properties in CuCrZr alloy following hydrostatic extrusion process

Sylwia Przybysz Mariusz Kulczyk Jacek Skiba Monika Skorupska

Bulletin of the Polish Academy of Sciences Technical Sciences | 2022 | 70 | No. 4 | e141725 | DOI: 10.24425/bpasts.2022.141725

Keywords hydrostatic extrusion anisotropy mechanical properties CuCrZr alloy

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Abstract

The methods of severe plastic deformation (SPD) of metals and metal alloys are very attractive due to the possibility of refinement of the grains to nanometric sizes, which facilitates obtaining high mechanical properties. This study investigated the influence of SPD in the process of hydrostatic extrusion (HE) on the anisotropy of the mechanical properties of the CuCrZr copper alloy. The method of HE leads to the formation of a characteristic microstructure in deformed materials, which can determine their potential applications. On the longitudinal sections of the extruded bars, a strong morphological texture is observed, manifested by elongated grains in the direction of extrusion. In the transverse direction, these grains are visible as equiaxed. The anisotropy of properties was mainly determined based on the analysis of the static mini-sample static tensile test and the dynamic impact test. The obtained results were correlated with microstructural observations. In the study, three different degrees of deformation were applied at the level necessary to refine the grain size to the ultrafine-grained level. Regardless of the applied degree of deformation, the effect of the formation of a strong morphological texture was demonstrated, as a result of which there is a clear difference between the mechanical properties depending on the test direction, both by the static and dynamic method. The obtained results allow for the identification of the characteristic structure formed during the HE process and the more effective use of the CuCrZr copper alloy in applications.

Authors and Affiliations

Sylwia Przybysz

1

Mariusz Kulczyk

1

e-mail:

ORCID:

Jacek Skiba

1

Monika Skorupska

1

Institute of High Pressure Physics of the Polish Academy of Sciences, Warszawa, Poland

Cavitation erosion of electrostatic spray polyester coatings with different surface finish

Mirosław Szala Aleksander Świetlicki Weronika Sofińska-Chmiel

Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 4 | e137519 | DOI: 10.24425/bpasts.2021.137519

Keywords polyester powder coatings cavitation erosion profilometry spectroscopy wear mechanism AW-6060 aluminium alloy

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Abstract

Polyester coatings are among the most commonly used types of powder paints and present a wide range of applications. Apart from its decorative values, polyester coating successfully prevents the substrate from environmental deterioration. This work investigates the cavitation erosion (CE) resistance of three commercial polyester coatings electrostatic spray onto AW-6060 aluminium alloy substrate. Effect of coatings repainting (single- and double-layer deposits) and effect of surface finish (matt, silk gloss and structural) on resistance to cavitation were comparatively studied. The following research methods were used: CE testing using ASTM G32 procedure, 3D profilometry evaluation, light optical microscopy, scanning electron microscopy (SEM), optical profilometry and FTIR spectroscopy. Electrostatic spray coatings present higher CE resistance than aluminium alloy. The matt finish double-layer (M2) and single-layer silk gloss finish (S1) are the most resistant to CE. The structural paint showed the lowest resistance to cavitation wear which derives from the rougher surface finish. The CE mechanism of polyester coatings relies on the material brittle-ductile behaviour, cracks formation, lateral net-cracking growth and removal of chunk coating material and craters’ growth. Repainting does not harm the properties of the coatings. Therefore, it can be utilised to regenerate or smother the polyester coating finish along with improvement of their CE resistance.

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Authors and Affiliations

Mirosław Szala

1

e-mail:

ORCID:

Aleksander Świetlicki

2

Weronika Sofińska-Chmiel

3

Department of Materials Engineering, Faculty of Mechanical Engineering, Lublin University of Technology, ul. Nadbystrzycka 36, 20-618 Lublin, Poland
Students Research Group of Materials Technology, Department of Materials Engineering, Lublin University of Technology, ul. Nadbystrzycka 36, 20-618 Lublin, Poland
Analytical Laboratory, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Sklodowska University, pl. Maria Curie-Sklodowska 3, 20-031 Lublin, Poland

Retraction notice Machining of microholes in Ti-6Al-4V by hybrid micro-electrical discharge machining to improve process parameters and flushing properties

Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 4 | e00ret1

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Quality Cost Account as a Framework of Continuous Improvement at Operational and Strategic Level

Ilona Herzog Marta Grabowska

Management and Production Engineering Review | 2021 | vol. 12 | No 4 | DOI: 10.24425/mper.2021.140000

Keywords Quality costs Improvement projects Quality management Operational Strategic decisions

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Abstract

The aim of the article is to present an exemplary system for recording and analyzing quality costs and to demonstrate that it is helpful in planning and assessing the effectiveness of continuous improvement processes at the operational and strategic level. Various approaches to defining quality costs are described, followed by indicators for assessing effectiveness and tools to collect data on the values of individual groups of quality costs and compare them with financial indicators. The practical part presents a case study on the quality cost accounting system in a medical company and the possibility of using quality cost accounting to plan and evaluate continuous improvement processes and make managerial decisions.

Authors and Affiliations

Ilona Herzog

Marta Grabowska

Industrial Symbiosis, Circular Economy and Industry 4.0 – A Case Study in Finland

Anne-Mari Järvenpää Vesa Salminen Jussi Kantola

Management and Production Engineering Review | 2021 | vol. 12 | No 4 | DOI: 10.24425/mper.2021.139999

Keywords Circular Economy Industrial Symbiosis Industry 4.0

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Abstract

The aim of our research is to gain understanding about material flow related information sharing in the circular economy value network in the form of industrial symbiosis. We need this understanding for facilitating new industrial symbiosis relationships and to support the optimization of operations. Circular economy has been promoted by politics and regulation by EU. In Finland, new circular economy strategy raises the facilitation of industrial symbiosis and data utilization as the key actions to improve sustainability and green growth. Companies stated that the practical problem is to get information on material availability. Digitalization is expected to boost material flows in circular economy by data, but what are the real challenges with circular material flows and what is the willingness of companies to develop co-operation? This paper seeks understanding on how Industry 4.0 is expected to improve the efficiency of waste or by-product flows and what are the expectations of companies. The research question is: How Industry 4.0 technologies and solutions can fix the gaps and discontinuities in the Industrial Symbiosis information flow? This research is conducted as a qualitative case study research with three cases, three types of material and eight companies. Interview data were collected in Finland between January and March 2021. Companies we interviewed mentioned use-cases for sensors and analytics to optimize the material flow but stated the investment cost compared to the value of information. To achieve sustainable circular material flows, the development needs to be done in the bigger picture, for the chain or network of actors, and the motivation and the added value must be found for each of them.

Authors and Affiliations

Anne-Mari Järvenpää

Vesa Salminen

Jussi Kantola

A Measuring Tool for the Digital Maturity of Small and Medium-Sized Enterprises

Ágnes Sándor Ákos Gubán

Management and Production Engineering Review | 2021 | vol. 12 | No 4 | DOI: 10.24425/mper.2021.140001

Keywords digitalization Digital maturity model SMEs Fuzzy method

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Abstract

In digital revolution, the appropriate IT infrastructure, technological knowledge are essential for the success of companies, where the success of the digital transformation depends on digital maturity. The aim of the study is to define the digital maturity, theoretical foundation of the digital maturity model and present a framework for small and medium-sized enterprises (SMEs) understanding where they are in digitalisation (how advanced their digital resource system and digital approach) to respond faster and efficiently to environmental changes. The model construction is based on theory of dynamic capabilities, graduation models, and SMEs management challenges. The model is a dynamic model to support management in strategic, digital and organizational developments, which is divided into IT and organizational dimensions, including 6 components and 28 subcomponents. The ultimate goal of the study is to determine the component weights to create a neurofuzzy model.

Authors and Affiliations

Ágnes Sándor

Ákos Gubán

The Interconnections Between ICT, Industry 4.0 and Agile Manufacturing

Ibrahim Khan Mohammed Stefan Trzcielinski

Management and Production Engineering Review | 2021 | vol. 12 | No 4 | DOI: 10.24425/mper.2021.139998

Keywords Information Communication Technology (ICT) Agile Manufacturing (AM) Lean Production Industry 4.0 Small and medium size enterprise (SME)

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Abstract

Technological progress is the driving force behind industrial development. It is a multidimensional and multi-level phenomenon. In this article we focus on its three manifestations: information and communication technologies (ICT), Industry 4.0 and agile manufacturing. The aim of this article is to analyse the relationship between these constructs as they are undoubtedly interrelated. ICT plays a key role, but it is not a goal itself. They are a prerequisite for the implementation of Industry 4.0, but together with it they serve to achieve agility by the manufacturing system and, as a result, achieve a competitive advantage by companies operating in turbulent and unpredictable environment. The literature findings in this paper are part of a broader study conducted on the impact of ICT on agility of SMEs operating in India. Therefore, we include also subsections showing the level of this relationship in Indian SMEs.

Authors and Affiliations

Ibrahim Khan Mohammed

Stefan Trzcielinski

The Technological Factors of Enterprise Innovation in a Strategic Perspective

Danuta Rojek

Management and Production Engineering Review | 2021 | vol. 12 | No 4 | DOI: 10.24425/mper.2021.139997

Keywords innovativeness technology Factor analysis Structural Equation Modeling

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Abstract

Enterprise innovation is currently becoming a recognized factor of the competitiveness, survival, and development of companies in the market economy. Managers still need recommendations on ways of stimulating the growth of innovation in their companies. The objective of this paper is to identify the strategic factors of enterprise innovativeness in the area of technology, defined as the most important internal factors positively impacting the innovativeness of enterprises in a strategic perspective. Empirical studies were conducted using the Computer-Assisted Web Interview (CAWI) method on a purposive sample of N = 180 small and medium-sized innovative industrial processing enterprises in Poland. Data analysis was performed using Exploratory Factor Analysis within the Confirmatory Factor Analysis framework (E-CFA) and Structural Equation Modeling (SEM). Empirical research shows that the strategic factor of enterprise innovativeness in the area of technology is technological activity. A technologically active company should (1) possess a modern machinery stock, (2) conduct systematic technological audits, and (3) maintain close technical cooperation with the suppliers of raw materials, consumables, and intermediates. The implementation of the indicated recommendations by managers should lead to increased innovativeness of small and medium-sized industrial companies. The author recommends the use of the presented research procedure and data analysis methods in further studies.

Authors and Affiliations

Danuta Rojek

A Multi-label Transformation Framework for the Rectangular 2D Strip-Packing Problem

Neuenfeldt Júnior Alvaro Matheus Francescatto Gabriel Stieler David Disconzi

Management and Production Engineering Review | 2021 | vol. 12 | No 4 | DOI: 10.24425/mper.2021.139992

Keywords Strip-packing problem data mining Multi-label transformation Classification analysis Heuristics

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Abstract

The present paper describes a methodological framework developed to select a multi-label dataset transformation method in the context of supervised machine learning techniques. We explore the rectangular 2D strip-packing problem (2D-SPP), widely applied in industrial processes to cut sheet metals and paper rolls, where high-quality solutions can be found for more than one improvement heuristic, generating instances with multi-label behavior. To obtain single-label datasets, a total of five multi-label transformation methods are explored. 1000 instances were generated to represent different 2D-SPP variations found in real-world applications, labels for each instance represented by improvement heuristics were calculated, along with 19 predictors provided by problem characteristics. Finally, classification models were fitted to verify the accuracy of each multi-label transformation method. For the 2D-SPP, the single-label obtained using the exclusion method fit more accurate classification models compared to the other four multi-label transformation methods adopted.

Authors and Affiliations

Neuenfeldt Júnior Alvaro

Matheus Francescatto

Gabriel Stieler

David Disconzi

Quality Information and Quality Performance: Roles of Process Control as a Mediator and Shop Floor Leadership as a Moderator

Ngoc Anh Nguyen Chi Phan Anh Thi Xuan Thoa Pham Matsui Yoshiki

Management and Production Engineering Review | 2021 | vol. 12 | No 4 | DOI: 10.24425/mper.2021.139991

Keywords Total quality management leadership quality performance High-Performance

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Abstract

This study investigates (1) the effect of quality information on quality performance through process control and (2) the moderating role of shop floor leadership on the relationship between quality information and quality performance in the context of manufacturing plants on a global basis. The moderated mediation analysis with a bootstrapping approach was employed to analyse data for hypotheses testing. The data is from the fourth-round dataset of the High- Performance Manufacturing Project, collected from manufacturing plants worldwide. The results indicate that (1) quality information is positively associated with quality performance through process control, and (2) shop floor leadership (i.e., supervisory interaction facilitation) positively moderates the indirect effect of quality information on quality performance; that is, the shop floor leadership practice strengthens the effect of quality information on quality performance through process control. This study also has a practical implication for top managers who should consider the vital role of leadership practices adopted by shop floor supervisors in implementing total quality management practices and should raise awareness that leadership practices are not only for the ‘C-suite’ but also for shop floor supervisors.

Authors and Affiliations

Ngoc Anh Nguyen

Chi Phan Anh

Thi Xuan Thoa Pham

Matsui Yoshiki

Seru Production System: A Review and Projections for Future Research

Yung Chin Shih

Management and Production Engineering Review | 2021 | vol. 12 | No 4 | DOI: 10.24425/mper.2021.139995

Keywords Seru production systems Flexible and reconfigurable manufacturing systems Production activity control Assembly and disassembly Manufacturing plant control

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Abstract

In mid-1992, Japanese consultant Yamada Hitoshi was tasked with modifying the production systems of Japanese companies as the existing configurations at manufacturing plants no longer satisfied unstable demands. He made improvements to the overall production system by dividing the long assembly lines into several short ones called cells or seru. Although of the advantages, it is still unclear about how to manage this new production system, and what variables really promoted the desired benefits. We identify in total 39 articles from 2004– 2020 about the progress of the seru production system, and we observe some possibilities to improve the effectiveness of this type of the production system. The first is the possibility of manufacturing the product in flexible sequence, in which the operations are independent among them. We show through the developed example that the makespan may be different. We noted when converting the in-line production system to one pure seru, the makespan tend to increase. Nevertheless, when analyzing the effectiveness of serus working concomitantly considering splitting the same lot, makespan and the cost may be reduced. And finally, when converting to one of pure serus, the performance may be similar to that obtained when serus working concomitantly.

Authors and Affiliations

Yung Chin Shih

The Role of Internal Conditions in the Implementation of the Lean Green Concept: American, Japanese and Polish Experiences

Nicoletta Baskiewicz Claudiu Barbu

Management and Production Engineering Review | 2021 | vol. 12 | No 4 | DOI: 10.24425/mper.2021.139996

Keywords Lean Lean Green Lean Green implementation conditions of Lean Green implementation

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Abstract

Lean Green is a concept which is implemented as a part of the sustainable development strategy, share allowing for reduction of the company’s costs related to, on the one hand, efficient use of energy factors and on the other optimum use of production factors aimed at minimisation of wastefulness, in particular in the area of post-production waste and pollution. The purpose of the article is to identify the determinants, internal stimuli and to specify the force with which they affect the implementation of the Lean Green concept in companies on various continents: America, Asia and Europe. For the purpose of better recognition of the examined problem, analysis of results of studies was made in consideration of the following criteria: country where a given company operates and share of persons outside the company in the process of implementation of this concept. In article uses the one-way ANOVA methodology, the Shapiro Wilk and Levene tests and the non-parametric Kruskal Wallis test. Hitherto studies have confirmed that the determinants are regional, which indicates the necessity of directional studies.

Authors and Affiliations

Nicoletta Baskiewicz

Claudiu Barbu

Optimization of Aggregate Production Planning Problems with and without Productivity Loss using Python Pulp Package

Hakeem Ur REHMAN Ayyaz AHMAD Zarak ALI Sajjad Ahmad BAIG Umair MANZOOR

Management and Production Engineering Review | 2021 | vol. 12 | No 4 | DOI: 10.24425/mper.2021.139993

Keywords Aggregate Production Planning productivity Python PuLP Optimization

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Abstract

Traditionally the aggregate production plan helps in determining the inventory, production, and work-force, based on the demand forecasts without considering the productivity loss at a tactical level in supply chain planning. In this paper, we include the productivity loss into traditional aggregate production plan and the prescriptive analytics technique, linear programming, is used to solve this problem of practical interest in the domain of multifarious businesses and industries. In this study, we discussed two model variations of the aggregate production planning problem with and without productivity loss, i) fixed work-force, and ii) variable Work Force. The mathematical models were designated to be solved by using an open-source python pulp package in order to evaluate the impacts of the productivity loss on both the models. PuLP is an open-source modeling framework provided by the COIN-OR Foundation (Computational Infrastructure for Operations Research) for linear and integer Programing problems written in Python. The computational results indicate that the productivity loss has direct impact on the workforce hiring and firing.

Authors and Affiliations

Hakeem Ur REHMAN

Ayyaz AHMAD

Zarak ALI

Sajjad Ahmad BAIG

Umair MANZOOR

New Characteristics in the Assessment of Reliability of Machines and Devices

Gabriela Kopania Anna Kuczmaszewska

Management and Production Engineering Review | 2021 | vol. 12 | No 4 | DOI: 10.24425/mper.2021.139994

Keywords Reliability Damage intensity function Cumulative damage intensity function

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Abstract

The aim of this work is to present new reliability characteristics expressed as functions of some variable expressing the measure of effective operation of a machine or a device. These characteristics can be used for both renewable and non-renewable objects. Their mathematical idea reflects the essence of already known characteristics, i.e. it expresses the probability of failure but expressed as a function of a variable, not necessarily identified with time.

Authors and Affiliations

Gabriela Kopania

Anna Kuczmaszewska

Production Line Modelling in Accordance with the Industry 4.0 Concept as an Element of Process Management in the Iron and Steel Industry

Mariusz Niekurzak Ewa Kubińska-Jabcoń

Management and Production Engineering Review | 2021 | vol. 12 | No 4 | 3-12 | DOI: 10.24425/mper.2021.139990

Keywords Hot rolling mill Logistic model of a mill Steel strip Stock management

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Abstract

Simulations are becoming one of the most important techniques supporting production preparation, even in those industrial sectors with atypical technological processes, such as in metallurgy, where there is a multiphase material flow. This is due to the fact that in the conditions of a market economy, enterprises have to solve more and more complex problems in a shorter time. On the basis of the existing production process and the knowledge of the flow characteristics in a given process, a model is built, which, when subjected to simulation tests, provides experimental results in the scope of the defined problem. The use of computer techniques also creates new possibilities for the rational use of the reserves inherent in each technological process. Taking into account the existing demand and the state of modern technology, the computer model can be a source of information for further analysis and decision-making processes supporting company management. At work a model of the logistic system was made on the example of a hot-rolled steel strip mill, on which simulation experiments were carried out to improve the effectiveness and efficiency of the analysis production line. The presented article aims to disseminate the idea of ??Industry 4.0 in Polish companies from the manufacturing industry sector, taking into account simulation techniques.

Authors and Affiliations

Mariusz Niekurzak

1

Ewa Kubińska-Jabcoń

1

AGH University of Science and Technology, Faculty of Management, Poland

Analysis of high-speed angular ball bearing lubrication based on bi-directional fluid-solid coupling

Bowen Jiao Qiang Bian Xinghong Wang Chunjiang Zhao Ming Chen Xiangyun Zhang

Archive of Mechanical Engineering | 2023 | vol. 70 | No 4 | 531-551 | DOI: 10.24425/ame.2023.148698

Keywords angular contact ball bearings fluid-structure-interaction bi-directional coupling lubrication

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Abstract

The lubrication of angular contact ball bearings under high-speed motion conditions is particularly important to the working performance of rolling bearings. Combining the contact characteristics of fluid domain and solid domain, a lubrication calculation model for angular contact ball bearings is established based on the RNG k-ε method. The pressure and velocity characteristics of the bearing basin under the conditions of rotational speed, number of balls and lubricant parameters are analyzed, and the lubrication conditions and dynamics of the angular contact ball bearings under different working conditions are obtained. The results show that the lubricant film pressure will rise with increasing speed and viscosity of the lubricant. The number of balls affects the pressure and velocity distribution of the flow field inside the bearing but has a small effect on the values of the characteristic parameters of the bearing flow field. The established CFD model provides a new approach to study the effect of fluid flow on bearing performance in angular contact ball bearings.

Bibliography

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Authors and Affiliations

Bowen Jiao

1

e-mail:

ORCID:

Qiang Bian

1

e-mail:

ORCID:

Xinghong Wang

1

Chunjiang Zhao

1

e-mail:

ORCID:

Ming Chen

1

Xiangyun Zhang

2

School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan, China
Luoyang Bearing Research Institute Co., Ltd, Luoyang, China

Design and performance analysis of a mechanically coupled spring compliant to out-of-plane oscillation

Duong Van Nguyen Chien Quoc Nguyen Hieu Van Dang Hoang Manh Chu

Archive of Mechanical Engineering | 2022 | vol. 69 | No 4 | 629-643 | DOI: 10.24425/ame.2022.141520

Keywords coupled spring mode coupling serpentine spring Sigitta spring theory finite element method

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Abstract

In this paper, a spring system symmetrically arranged around a circular plate compliant to out-of-plane oscillation is proposed. The spring system consists of single serpentine springs mutually coupled in a plane. Three theoretical mechanical models for evaluating the stiffness of the spring system are built, which are based on the flexural beam, Sigitta, and serpentine spring theories and equivalent mechanical spring structure models. The theoretically calculated results are in good agreement with numerical solutions using the finite element method, with errors less than 10% in the appropriate dimension ranges of the spring. Compared to similar spring structures without mechanical coupling, the proposed mechanically coupled spring shows advantage in suppressing the mode coupling.

Bibliography

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Authors and Affiliations

Duong Van Nguyen

1 2

e-mail:

ORCID:

Chien Quoc Nguyen

1

e-mail:

ORCID:

Hieu Van Dang

2

e-mail:

ORCID:

Hoang Manh Chu

1

e-mail:

ORCID:

International Training Institute for Materials Science, Hanoi University of Science and Technology, Vietnam
FPT University, Hanoi, Vietnam

Optimization of gear teeth in the wind turbine drive train with gear contact’s uncertainty using the reliability-based design optimization

Changwoo Lee Yonghui Park

Archive of Mechanical Engineering | 2022 | vol. 69 | No 4 | 713-728 | DOI: 10.24425/ame.2022.141519

Keywords wind turbine drive train gear structural analysis dynamics Fourier transform reliability based design optimization

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Abstract

Although gear teeth give lots of advantages, there is a high possibility of failure in gear teeth in each gear stage in the drive train system. In this research, the authors developed proper gear teeth using the basic theorem of gear failure and reliability-based design optimization. A design variable characterized by a probability distribution was applied to the static stress analysis model and the dynamics analysis model to determine an objective function and constraint equations and to solve the reliability-based design optimization. For the optimization, the authors simulated the torsional drive train system which includes rotational coordinates. First, the authors established a static stress analysis model which gives information about endurance limit and bending strength. By expressing gear mesh stiffness in terms of the Fourier series, the equations of motion including the gear mesh models and kinematical relations in the drive train system were acquired in the form of the Lagrange equations and constraint equations. For the numerical analysis, the Newmark Beta method was used to get dynamic responses including gear mesh contact forces. From the results such as the gear mesh contact force, the authors calculated the probability of failure, arranged each probability and gear teeth, and proposed a reasonable and economic design of gear teeth.

Bibliography

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Authors and Affiliations

Changwoo Lee

1

Yonghui Park

2

e-mail:

ORCID:

Pohang Institute of Metal Industry Advancement, Pohang, Republic of Korea
Department of Mechanical Engineering, Yuhan University, Bucheon, Republic of Korea

Modeling of the axial crumpling of conical shells

Riyah N. Kiter Mazin Y. Abbood Omar H. Hassoon

Archive of Mechanical Engineering | 2022 | vol. 69 | No 4 | 615-628 | DOI: 10.24425/ame.2022.143096

Keywords axial crushing concertina eccentricity ABAQUS inward folding

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Abstract

The axial crumpling of frusta in the axisymmetric "concertina" mode is examined. A new theoretical model is developed in which the inward folding in both cylinders and frusta is addressed. The results were compared with previous relevant models as well as experimental findings. The flexibility of the model was substantiated by its capability of describing and estimating the inward folding in frusta in general as well as in cylinders as a special case. A declining trend of the eccentricity dependence with the D/t ratio was found in contrast with a previous theory which suggests total independency. ABAQUS 14-2 finite element software was employed to simulate the thin tube as a 3-D thin shell part. Numerical simulations of the process were found to, firstly, underestimate the theoretical values of inward folding in general, secondly anticipate more underestimations as the tubes become thinner and/or have larger apex angle, and finally anticipate as low as 300 apical angle frusta to revert its mode of deformation to global inversion.

Bibliography

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Authors and Affiliations

Riyah N. Kiter

1

Mazin Y. Abbood

1

e-mail:

ORCID:

Omar H. Hassoon

2

e-mail:

ORCID:

Department of Mechanical Engineering, College of Engineering, University of Anbar, Iraq
Department of Production and Metallurgy Engineering, University of Technology, Baghdad, Iraq

Numerical predictions of laminar flow and free convection heat transfer from an isothermal vertical flat plate

Ali Belhocine Nadica Stojanovic Oday Ibraheem Abdullah

Archive of Mechanical Engineering | 2022 | vol. 69 | No 4 | 749-773 | DOI: 10.24425/ame.2022.141523

Keywords free convective flow vertical flat plate similarity solution boundary layer flow dimensionless temperature Prandtl number Runge-Kutta method

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Abstract

In this present work, the laminar free convection boundary layer flow of a two-dimensional fluid over the vertical flat plate with a uniform surface temperature has been numerically investigated in detail by the similarity solution method. The velocity and temperature profiles were considered similar to all values and their variations are as a function of distance from the leading edge measured along with the plate. By taking into account this thermal boundary condition, the system of governing partial differential equations is reduced to a system of non-linear ordinary differential equations. The latter was solved numerically using the Runge-Kutta method of the fourth-order, the solution of which was obtained by using the FORTRAN code on a computer. The numerical analysis resulting from this simulation allows us to derive some prescribed values of various material parameters involved in the problem to which several important results were discussed in depth such as velocity, temperature, and rate of heat transfer. The definitive comparison between the two numerical models showed us an excellent agreement concerning the order of precision of the simulation. Finally, we compared our numerical results with a certain model already treated, which is in the specialized literature.

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Authors and Affiliations

Ali Belhocine

1

e-mail:

ORCID:

Nadica Stojanovic

2

Oday Ibraheem Abdullah

3

Department of Mechanical Engineering, University of Sciences and the Technology of Oran, Algeria
University of Kragujevac, Faculty of Engineering, Department for Motor Vehicles and Motors, Serbia
System Technologies and Mechanical Design Methodology, Hamburg University of Technology, Hamburg, Germany

Kinematic synthesis of the mechanism for static balancing of an input torque in three positions

Jacek Buśkiewicz

Archive of Mechanical Engineering | 2022 | vol. 69 | No 4 | 571-594 | DOI: 10.24425/ame.2022.143095

Keywords mechanism synthesis machine design discrete balancing torque balancing

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Abstract

The aim of this work is to design the links‒spring mechanism for balancing, in the three positions of the operating range, a rotary disc subjected to a torque. An energy-related approach towards the conditions of the mechanical system balance for a discrete number of positions leads to the formulation of a task of searching for a four-bar linkage which guides a coupler point through the prescribed positions, where, at the same time, geometrical conditions (specifying the spring tension) and kinematic conditions (defining the radial component of the tension change rate) are satisfied. The finitely and infinitesimally separated position synthesis is considered, however, only a component of the coupler point velocity is essential. A general method was proposed for determining the four-bar mechanism geometry. Mechanism inversion was applied in order to reduce the number of designed variables and simplify the solution method. The system of complex algebraic equations defines the problem. Linear, symbolic transformations and a systematic search technique are utilized to find multiple local optimal solutions. The problem is solved using Mathematica software.

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Authors and Affiliations

Jacek Buśkiewicz

1

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Poznan University of Technology, Poznan, Poland

Movements in the ocean

Stanisław Rakusa-Suszczewski

Nauka | 2023 | No 4 | 159-165

Keywords plankton feeding individual and colecting movent

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Abstract

Individual movement of plankton in the ocean is related to trophic relationships between dominant groups. Collective movement is a consequence of the movement of water masses, diurnal cycles and global movement of ocean currents, and climate change

Authors and Affiliations

Stanisław Rakusa-Suszczewski

1

członek rzeczywisty PAN

EASAC Environmental Steering Panel – what's new in the Panel?

Rajmund Michalski

Nauka | 2023 | No 4 | 151-158 | DOI: 10.24425/nauka.2023.148232

Keywords EASAC environment forest biomass neonicotinoids regenerative agriculture deep sea mining

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Abstract

On 28 March 2023, the first ESP EASAC meeting in 2023 took place in Budapest at the invitation of the Hungarian Academy of Sciences. The broad and interesting range of issues addressed by Environmental Steering Panel should attract more interest also in Poland. Unfortunately, the activity in EASAC is pro publico bono, which is probably the main reason for the low activity of Polish scientists as experts invited to individual projects. Is the organisation referred to in this article credible? The answer is that, at the end of 2018, EASAC was awarded “Think Tank of the Year” by the prestigious Public Affairs Awards Europe. This shows that the activity is appreciated among professionals. I sincerely encourage anyone interested to find out more about what ESP EASAC is doing and to keep checking our activities.

Authors and Affiliations

Rajmund Michalski

1

Instytut Podstaw Inżynierii Środowiska PAN, Zabrze

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