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Nicolescu, Mihai
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Publications (10 of 10) Show all publications
Kayol, B., Abu-Ghunmi, D., Abu-Ghunmi, L., Archenti, A., Nicolescu, M., Larkin, C. & Corbet, S. (2019). An economic index for measuring firm's circularity: The case of water industry. Journal of Behavioral and Experimental Finance, 21, 123-129
Open this publication in new window or tab >>An economic index for measuring firm's circularity: The case of water industry
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2019 (English)In: Journal of Behavioral and Experimental Finance, ISSN 2214-6350, E-ISSN 2214-6369, Vol. 21, p. 123-129Article in journal (Refereed) Published
Abstract [en]

Transition toward circular-economy model is a must to sustain the planet sources. Under circular economy model wastewater is transformed from a ste into a resource. Therefore, a comprehensive circular economy dex; the Circonomics Index, is proposed to measure circularity of stewater industry. The component indicators of the index are linked rectly to the three Rs; reduce, reuse and recycle, of circular onomy. The novelty of the proposed Index is that it uses objectively nstructed weights that reflect the environmental benefits of the eatment process, and the index captures the reuse and recycling ficiency of an WWTP, which reflect the specific nature of wastewater. e findings show that treatment technology is a major factor in termining the production efficiency, reuse rate and recycling rformance of a WWTP. The results of using the Circonomics Index have ofound implication for policy makers to speed up the process of moving a circular economy.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Reduce, Reuse, Recycle, Circonomics index, Wastewater
National Category
Other Environmental Engineering
Identifiers
urn:nbn:se:kth:diva-248349 (URN)10.1016/j.jbef.2018.11.007 (DOI)000461743500013 ()2-s2.0-85057611694 (Scopus ID)
Note

QC 20190405

Available from: 2019-04-05 Created: 2019-04-05 Last updated: 2019-04-05Bibliographically approved
Pervaiz, S., Deiab, I., Wahba, E., Rashid, A. & Nicolescu, M. (2018). A numerical and experimental study to investigate convective heat transfer and associated cutting temperature distribution in single point turning. The International Journal of Advanced Manufacturing Technology, 94(1-4), 897-910
Open this publication in new window or tab >>A numerical and experimental study to investigate convective heat transfer and associated cutting temperature distribution in single point turning
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2018 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 94, no 1-4, p. 897-910Article in journal (Refereed) Published
Abstract [en]

During the metal cutting operation, heat generation at the cutting interface and the resulting heat distribution among tool, chip, workpiece, and cutting environment has a significant impact on the overall cutting process. Tool life, rate of tool wear, and dimensional accuracy of the machined surface are linked with the heat transfer. In order to develop a precise numerical model for machining, convective heat transfer coefficient is required to simulate the effect of a coolant. Previous literature provides a large operating range of values for the convective heat transfer coefficients, with no clear indication about the selection criterion. In this study, a coupling procedure based on finite element (FE) analysis and computational fluid dynamics (CFD) has been suggested to obtain the optimum value of the convective heat transfer coefficient. In this novel methodology, first the cutting temperature was attained from the FE-based simulation using a logical arbitrary value of convective heat transfer coefficient. The FE-based temperature result was taken as a heat source point on the solid domain of the cutting insert and computational fluid dynamics modeling was executed to examine the convective heat transfer coefficient under similar condition of air interaction. The methodology provided encouraging results by reducing error from 22 to 15% between the values of experimental and simulated cutting temperatures. The methodology revealed encouraging potential to investigate convective heat transfer coefficients under different cutting environments. The incorporation of CFD modeling technique in the area of metal cutting will also benefit other peers working in the similar areas of interest.

Place, publisher, year, edition, pages
SPRINGER LONDON LTD, 2018
Keywords
Finite element modeling, Cutting temperature, Computational fluid dynamics, Convective heat transfer coefficient, Machining, Titanium alloys
National Category
Robotics
Identifiers
urn:nbn:se:kth:diva-221865 (URN)10.1007/s00170-017-0975-9 (DOI)000419114100070 ()2-s2.0-85028012749 (Scopus ID)
Note

QC 20180131

Available from: 2018-01-31 Created: 2018-01-31 Last updated: 2018-01-31Bibliographically approved
Wang, Y., Zhang, P.-L., Semere, D., Nicolescu, M. & Zhang, Q.-Y. (2018). Research on Development Mechanism of "Family Farm" under E-commerce. In: 2018 INTERNATIONAL CONFERENCE ON E-COMMERCE AND CONTEMPORARY ECONOMIC DEVELOPMENT (ECED 2018): . Paper presented at International Conference on E-commerce and Contemporary Economic Development (ECED), APR 21-22, 2018, Hangzhou, PEOPLES R CHINA (pp. 1-12). DESTECH PUBLICATIONS, INC
Open this publication in new window or tab >>Research on Development Mechanism of "Family Farm" under E-commerce
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2018 (English)In: 2018 INTERNATIONAL CONFERENCE ON E-COMMERCE AND CONTEMPORARY ECONOMIC DEVELOPMENT (ECED 2018), DESTECH PUBLICATIONS, INC , 2018, p. 1-12Conference paper, Published paper (Refereed)
Abstract [en]

Agricultural e-commerce will be the production and processing of agricultural products, organic combination of transportation storage and distribution sales process, the omni-directional into e-commerce system, through the computer information network, and with their own production base and advanced logistics distribution system as the backing, the convenience of using the Internet, to complete the purchase of agricultural products, sales, online payment and other related business process. Developing agricultural e-commerce is conducive to promoting agricultural development and farmers' income, and the "family farm", as a large-scale, intensive, the commercialization of agricultural management system, complied with the trend of the development of electronic commerce, so as to speed up the development of e-commerce, highlight the function mechanism of "family farm" in the agricultural e-commerce mechanism.

Place, publisher, year, edition, pages
DESTECH PUBLICATIONS, INC, 2018
Series
DEStech Transactions on Economics Business and Management, ISSN 2475-8868
Keywords
Family farm, Agricultural products E-Commerce, Development mechanism
National Category
Business Administration
Identifiers
urn:nbn:se:kth:diva-239832 (URN)10.12783/dtem/eced2018/23925 (DOI)000450405000001 ()30229685 (PubMedID)978-1-60595-552-0 (ISBN)
Conference
International Conference on E-commerce and Contemporary Economic Development (ECED), APR 21-22, 2018, Hangzhou, PEOPLES R CHINA
Note

QC 20190107

Available from: 2019-01-07 Created: 2019-01-07 Last updated: 2019-05-29Bibliographically approved
Adane, T. (2018). Towards a Generic Framework for the Performance Evaluation of Manufacturing Strategy: An Innovative Approach. Towards a Generic Framework for the Performance Evaluation of Manufacturing Strategy: An Innovative Approach, 9(2), 131-156
Open this publication in new window or tab >>Towards a Generic Framework for the Performance Evaluation of Manufacturing Strategy: An Innovative Approach
2018 (English)In: Towards a Generic Framework for the Performance Evaluation of Manufacturing Strategy: An Innovative Approach, Vol. 9, no 2, p. 131-156Article in journal (Refereed) Published
Abstract [en]

To be competitive in a manufacturing environment by providing optimal performance in terms of cost-effectiveness and swiftness of system changes, there is a need for flexible production systems based on a well-defined strategy. Companies are steadily looking for methodology to evaluate, improve and update the performance of manufacturing systems for processing operations. Implementation of an adequate strategy for these systems’ flexibility requires a deep understanding of the intricate interactions between the machining process parameters and the manufacturing system’s operational parameters. This paper proposes a framework/generic model for one of the most common metal cuttingoperations—the boring process of an engine block machining system. A system dynamics modelling approach is presented for modelling the structure of machining system parameters of the boring process, key performance parameters and their intrinsic relationships. The model is based on a case study performed in a company manufacturing engine blocks for heavy vehicles. The approach could allow for performance evaluation of an engine block manufacturing system condition. The presented model enables a basis for other similar processes and industries producing discrete parts.

Keywords
performance evaluation; machining strategies; manufacturing system; manufacturing strategy; machining process interaction; dynamic modelling; performance criteria; system dynamics
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:kth:diva-229086 (URN)
Note

QC 20180604

Available from: 2018-06-01 Created: 2018-06-01 Last updated: 2018-06-04Bibliographically approved
Frangoudis, C., Rashid, A. & Nicolescu, C. M. (2017). Development and analysis of a consciously designed Joint Interface Module for improvement of a machining system's dynamic performance. The International Journal of Advanced Manufacturing Technology, 88(1-4), 507-518
Open this publication in new window or tab >>Development and analysis of a consciously designed Joint Interface Module for improvement of a machining system's dynamic performance
2017 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 88, no 1-4, p. 507-518Article in journal (Refereed) Published
Abstract [en]

Machining vibrations and dynamic instability of machine tools is an important consideration in machining systems. Common approaches for improving their dynamic performance target either the process, or intelligent, yet complex control systems with actuators. Given that machine tools' dynamic characteristics are largely defined by the characteristics of the joints, this article proposes a novel concept, attempting to create a new paradigm for improving the dynamic behaviour of machine tools-introducing modular machine tools components (Joint Interface Modules-JIMs) with joints deliberately designed for increasing dynamic stiffness and enhancing damping with the use of viscoelastic materials. Through a systematic model-based design process, a prototype replicating a reference tool holder was constructed exploiting viscoelastic materials and the dynamic response of the machining system was improved as a result of its introduction; in machining experiments, the stability limit was increased from around 2 mm depth of cut to 4 mm depth of cut, without compromising the rigidity of the system or changing the process parameters. The article also includes the results of investigations regarding the introduction of such prototypes in a machine tool and discusses the shortcomings of the stability lobe diagrams as a method for evaluating the performance of machine tool components with viscoelastically treated joints.

Place, publisher, year, edition, pages
Springer London, 2017
Keywords
Machine tool, Milling, Vibrations, Joints, Damping, Viscoelastic
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-202444 (URN)10.1007/s00170-016-8781-3 (DOI)000392308400044 ()2-s2.0-85009726941 (Scopus ID)
Funder
Swedish e‐Science Research CenterEU, FP7, Seventh Framework Programme, 260048XPRES - Initiative for excellence in production research
Note

QC 20170306

Available from: 2017-03-06 Created: 2017-03-06 Last updated: 2017-11-29Bibliographically approved
Wanner, B., Archenti, A. & Nicolescu, M. (2017). HYBRID MACHINING: ABRASIVE WATERJET TECHNOLOGIES USED IN COMBINATION WITH CONVENTIONAL METAL CUTTING. Journal of Machine Engineering, 17(3), 85-96
Open this publication in new window or tab >>HYBRID MACHINING: ABRASIVE WATERJET TECHNOLOGIES USED IN COMBINATION WITH CONVENTIONAL METAL CUTTING
2017 (English)In: Journal of Machine Engineering, ISSN 1895-7595, Vol. 17, no 3, p. 85-96Article in journal (Refereed) Published
Abstract [en]

Abrasive Waterjet technology is one of the fastest growing metal cutting technologies. Even so, very little published material is available on hybrid processing where abrasive waterjet cutting is one of two or more metal cutting methods. There is also limited published material on thin-walled components cut with abrasive waterjet technology. This paper makes a comparison of conventional metal cutting methods to the more unconventional abrasive waterjet technique. It will serve as a stepping stone in building knowledge aiding in hybrid machining development. It will show the possibilities and limitations during milling of thin-walled Aluminum components and then compare this to the capabilities of abrasive waterjet cutting the same components. Differences in material removal and revert control as well as in vibrations and force requirements will be reviewed. In addition, the environmental issues will be discussed and it will be determined which of the methods is more sustainable. The paper also includes a large section on process methodology.

Keywords
hybrid processing, abrasive waterjet, thin-wall milling, sustainability
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-216942 (URN)2-s2.0-85030534109 (Scopus ID)
Note

QC 20171101

Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2017-11-01Bibliographically approved
Pervaiz, S., Deiab, I., Rashid, A. & Nicolescu, M. (2017). Minimal quantity cooling lubrication in turning of Ti6Al4V: Influence on surface roughness, cutting force and tool wear. Proceedings of the Institution of mechanical engineers. Part B, journal of engineering manufacture, 231(9), 1542-1558
Open this publication in new window or tab >>Minimal quantity cooling lubrication in turning of Ti6Al4V: Influence on surface roughness, cutting force and tool wear
2017 (English)In: Proceedings of the Institution of mechanical engineers. Part B, journal of engineering manufacture, ISSN 0954-4054, E-ISSN 2041-2975, Vol. 231, no 9, p. 1542-1558Article in journal (Refereed) Published
Abstract [en]

Titanium alloys generally show low machinability ratings. They are referred as difficult-to-cut materials due to their inherent properties such as low thermal conductivity, high chemical reactivity and high strength at elevated temperatures. Cooling strategies play an important role to improve the machining performance of the cutting process. In order to facilitate the heat dissipation from the cutting zone, generous amount of coolant is used when machining highly reactive metals such as titanium alloys. Generally, cutting coolants are nominated as pollutants due to their non-biodegradable nature. This article presents experimental evaluation of a minimal quantity cooling lubrication system. The study investigates a combination of sub-zero-temperature air and vegetable oil-based mist as possible environmentally benign alternative to conventional cooling methods. The results are compared with the dry and flood cutting environments as well. Machinability was evaluated experimentally by considering the surface finish, cutting forces, tool life and their associated tool wear mechanisms. It was concluded from the results obtained from the surface roughness, cutting force and tool life investigation that minimal quantity cooling lubrication (internal) cooling strategy has encouraging potential to replace the conventional flood cooling method.

Place, publisher, year, edition, pages
Sage Publications, 2017
Keywords
Titanium alloys, minimal quantity cooling lubrication, sustainable machining, lubrication, cooling strategies, tool wear
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-210999 (URN)10.1177/0954405415599946 (DOI)000404030300004 ()2-s2.0-85021206613 (Scopus ID)
Note

QC 20170807

Available from: 2017-08-07 Created: 2017-08-07 Last updated: 2017-08-07Bibliographically approved
Adane, T. F. & Nicolescu, M. (2016). System dynamics as a decision support system for machine tool selection. Journal of Machine Engineering, 16(3), 102-125
Open this publication in new window or tab >>System dynamics as a decision support system for machine tool selection
2016 (English)In: Journal of Machine Engineering, ISSN 1895-7595, Vol. 16, no 3, p. 102-125Article in journal (Refereed) Published
Abstract [en]

The worldwide competitive economy, the increase in sustainable issue and investment of new production line is demanding companies to choose the right machine from the available ones. An improper selection can negatively affect the overall performance of the manufacturing system like productivity, quality, cost and company’s responsive manufacturing capabilities. Thus, selecting the right machine is desirable and substantial for the company to sustain competitive in the market. The ultimate objective of this paper is to formulate a framework for machining strategy and also provide methodology for selecting machine tool from two special purpose machine tools in consideration of interaction of attributes. A decision support system for the selection of machine tool is developed. It evaluates the performance of the machining process and enhances the manufacturer (decision maker) to select the machine with respect to the performance and the pre-chosen criteria. Case study was conducted in a manufacturing company. A system dynamics modelling and simulation techniques is demonstrated towards efficient selection of machine tool that satisfy the future requirement of engine-block production.

Place, publisher, year, edition, pages
Editorial Institution of Wrocaw Board of Scientific, 2016
Keywords
Decision making, Machine selection, Performance analysis, System dynamics modelling
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-195549 (URN)2-s2.0-84990997629 (Scopus ID)
Note

QC 20161109

Available from: 2016-11-09 Created: 2016-11-03 Last updated: 2018-06-04Bibliographically approved
Adane, T. F., Bianchi, M. F., Archenti, A. & Nicolescu, M. (2015). Performance evaluation of machining strategy for engine-block manufacturing. Performance evaluation of machining strategy for engine-block manufacturing, 15(4), 81-102
Open this publication in new window or tab >>Performance evaluation of machining strategy for engine-block manufacturing
2015 (English)In: Performance evaluation of machining strategy for engine-block manufacturing, ISSN 1895-7595, Vol. 15, no 4, p. 81-102Article in journal (Refereed) Accepted
Abstract [en]

This paper will introduce a novel methodology for the performance evaluation of machining strategies of engine block manufacturing. The manufacturing of engine components is vital to the automotive and vehicle manufacturing industries. Machining is critical processes in the production of these parts. To survive and excel in the competitive manufacturing environment, companies need to improve as well as update their machining processes and evaluate the performance of their machining lines. Moreover, the lines and processes have to be robust in handling different sources of variation over time that include such examples as demand fluctuations, work-piece materials or even any changes in design specifications. A system dynamics modelling and simulation approach has been deployed to develop a methodology that captures how machining system parameters from the machining process are interacted with each other, how these connections drive performance and how new targets affect process and machine tool parameters through time. The developed model could provide an insight of how to select the crucial machining system parameters and to identify the effect of those parameters on the output of the system. In response to such an analysis, this paper provides (offers) a framework to examine machining strategies and has presented model that is useful as a decision support system for the evaluation and selection of machining strategies. Here a system dynamics methodology for modelling is applied to the milling operation and the model is based on an actual case study from the engine-block manufacturing industry.

National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:kth:diva-229289 (URN)
Note

QC 20180604

Available from: 2018-06-01 Created: 2018-06-01 Last updated: 2018-06-04Bibliographically approved
Adane, T. F. & Nicolescu, M. (2014). System dynamics analysis of energy usage: Case studies in automotive manufacturing. International Journal of Manufacturing Research, 9(2), 131-156
Open this publication in new window or tab >>System dynamics analysis of energy usage: Case studies in automotive manufacturing
2014 (English)In: International Journal of Manufacturing Research, ISSN 1750-0591, Vol. 9, no 2, p. 131-156Article in journal (Refereed) Published
Abstract [en]

Our life is strongly linked with the usage of natural resources. With increase in world population and welfare there is an increasing global demand for raw material. Energy is a necessity in everyday life and is often generated using non-renewable natural resources which are finite. Manufacturing is one of the largest energy and material resource consumers. There is great concern about minimising consumption of energy in manufacturing industry to sustain the natural carrying capacity of the ecosystem. This is one of the challenges in today’s industrial world. The paper presents the application of system dynamics theory for modelling and simulation of complex manufacturing processes. The simulations help to understand the intricate nature of the interrelation of process parameter and to make sound decision about minimising the energy losses. Two case studies are presented, one in cylinder head casting processes and the other in crankshaft machining. The developed models provide an insight into how to select critical operations and to identify the effect of various parameters on the energy consumption. Also, the models help to understand how changes of parameters over time affect the behaviour of energy changes. The outcome of this research enables the company to identify potential avenues to minimise energy usage and offers a decision support tool.

National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:kth:diva-161011 (URN)10.1504/IJMR.2014.062440 (DOI)2-s2.0-84902212487 (Scopus ID)
Note

QC 20150317

Available from: 2015-03-17 Created: 2015-03-06 Last updated: 2018-06-04Bibliographically approved
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