Reliability evaluation and analysis of CNC cam shaft grinding machine

2015 ◽  
Vol 13 (1) ◽  
pp. 37-73 ◽  
Author(s):  
M.K. Loganathan ◽  
O.P. Gandhi
Keyword(s):  
System Reliability ◽  
Manufacturing Systems ◽  
Systems Approach ◽  
Reliability Evaluation ◽  
Point Of View ◽  
Graph Models ◽  
Content Type ◽  
Structural Graph ◽  
Hierarchical Levels ◽  
Grinding Machine

Purpose – Reliability assessment does require an effective structural modelling approach for systems, in general and manufacturing systems are no exception. This paper aims to develop it for large manufacturing systems using graph models, a systems approach. Design/methodology/approach – Structural graph models for reliability at various hierarchical levels are developed by considering a CNC cam shaft grinding machine. The system reliability expression is obtained by converting the reliability graphs into equivalent matrices, which helps to evaluate and analyse system. Findings – Using the obtained reliability expressions at various hierarchical levels of the system, it is possible not only to evaluate its reliability from structure point of view but also to identify weak structural elements from reliability point of view. Research limitations/implications – The approach can be extended to include the influence of other parameters, such as human, component and environment, etc., on the system reliability. Practical implications – The approach helps to design and develop manufacturing systems from reliability consideration by assessing their possible alternatives among these. Originality/value – The suggested methodology is useful for reliability evaluation of large and complex manufacturing systems.

Systems approach to complex systems modelling with special regards to tourism

Kybernetes ◽  
2006 ◽  
Vol 35 (7/8) ◽  
pp. 1048-1058 ◽  
Author(s):  
Tadeja Jere Lazanski ◽  
Miroljub Kljajić
Keyword(s):  
Complex Systems ◽  
System Dynamics ◽  
Systems Approach ◽  
Quantitative Model ◽  
Point Of View ◽  
Verbal Description ◽  
Content Type ◽  
Qualitative Models ◽  
Complex Systems Modelling ◽  
Global And Local

PurposeThe importance of context dependent modelling of complex systems, depending on the observer's point of view will be discussed. Thus, context is synonymous for the content of a problem in a frame of the goals, starting points and ways to achieve these aims. In this light, difficulties of model validation and a general method how to overcome them was discussed. The relations among subject – object – model in the light of a systems approach; Charles Sanders Peirce's triad principle and the semiotic principle of communication was presented.Design/methodology/approachThe appropriateness of a system dynamics methodology, which is due to its transparency and clarity an excellent tool for modelling of complex systems.FindingsIn the paper the equivalence of different methodologies was shown, whose differences and similarities can be judged only in context of a problem and the aims of researches. For illustration, the methodology is applied to a tourism system, which possesses the typical properties of global and local organisations. A verbal description of a tourism problem is followed by a causal loop diagram, which helps to discuss the problem categorically.Practical implicationsAs the methodology is implemented using quantitative model and POWERSIM tools; it offers the solution of national tourism strategy implication, selected from different scenarios.Originality/valueThis paper presents a simulation model of the tourism in a frame of system dynamics, developed from qualitative models, as an illustration of the discussed methodology.

The systems approach to the improvement of innovation in Slovenian tourism

Kybernetes ◽  
2014 ◽  
Vol 43 (3/4) ◽  
pp. 427-444 ◽  
Author(s):  
Marko Ropret ◽  
Tadeja Jere Jakulin ◽  
Borut Likar
Keyword(s):  
Systems Approach ◽  
Tourism Development ◽  
Study Data ◽  
Influential Factors ◽  
Point Of View ◽  
Development Model ◽  
Content Type ◽  
Research Results ◽  
Systems Model ◽  
Research Activities

Purpose – This paper aims to analyse whether and how the Development Plan and Policies of Slovenian Tourism (SiPlan) could be improved systematically and systemically, enabling more comprehensive management of innovation. Design/methodology/approach – The data were obtained within a comprehensive national innovation study. Data analysis was performed in four phases. In the initial phase, a link between the innovation project and SiPlan was established. In the next phase, which of the innovation factors are significantly correlated with the tourism destination development concept was identified. In the third phase, further policy potential for improving the innovation factors was identified. In the last phase, a systems approach was applied to develop a qualitative systems model, a causal loop diagram, taking into consideration the empirically identified strengths and weaknesses of the current SiPlan and other pertinent factors. Findings – The results of empirical research indicate that SiPlan represents a valuable, but not optimum development model of Slovene tourism development. Therefore, the authors propose a qualitative tourism development model based on the research results and a systems dynamics methodology. Originality/value – The work is important from the scientific point of view, i.e. as a methodology and research results that could be applied in further research activities. In addition, the results could be usefully used by policy makers by way of focusing on the most influential factors: policies that have a potential for the systems (holistic) and socially responsible development of tourism in Slovenia.

scholarly journals Operations flow effectiveness: a systems approach to measuring flow performance

2018 ◽  
Vol 38 (11) ◽  
pp. 2096-2123 ◽  
Author(s):  
Mohamed Afy-Shararah ◽  
Nicholas Rich
Keyword(s):  
Cash Flow ◽  
Operations Management ◽  
Manufacturing Systems ◽  
Systems Approach ◽  
Secondary Data ◽  
Performance Measure ◽  
Holistic View ◽  
Content Type ◽  
Design Elements ◽  
Labor Efficiency

Purpose Effective operations management systems (OMS) measurement remains a critical issue for theorists and practising managers (Neely, 2005; Bititci et al., 2012). Traditional labor efficiency measures sufficed when all that was made could be sold or when mass production systems filled warehouses with stock and the OMS had little relationship with “the consumer.” Modern manufacturing systems require a different form of flow optimization (beyond labor efficiency) measurement (Schmenner, 2015). The essential unit of measure for all OMS designs is the optimal use of time for process value adding and the flow of materials into and from the conversion process. Timely flow, therefore, satisfies the needs of multiple organizational stakeholders including cash flow (accounting), consumer reaction times (marketing) and the general steady state flow of materials (sales and supply chain). The purpose of this paper is to present the results of testing a new performance measure of operations flow effectiveness (OFE) with ten purposively selected cases. Design/methodology/approach The paper is theory building using ten, purposively selected, longitudinal case studies drawn from the UK high-value manufacturing (HVM) sector using a pluralist methodology of interviews, observation and secondary data. Findings The OFE measure provides a holistic view of material flow through the input-process-output cycles of a firm. The measure highlights OMS design weaknesses and flow inhibitors that reduce cash flow using a time-based approach to measuring OMS performance. The study validates the OFE measure and has identified six key design elements that enable high flow performance. Originality/value The paper tests a new process-focused flow performance measure. The measure supports a holistic approach to the manufacturing enterprise and allows different OMS designs to be evaluated so that organizational learning may be enacted to support performance improvement.

A model for reliability analysis of multi-state manufacturing systems

2014 ◽  
Vol 31 (8) ◽  
pp. 938-949 ◽  
Author(s):  
Seyed Ahmad Niknam ◽  
Rapinder Sawhney
Keyword(s):  
Reliability Analysis ◽  
System Reliability ◽  
Design Methodology ◽  
Manufacturing Systems ◽  
Manufacturing System ◽  
Production Systems ◽  
Case Scenario ◽  
Worst Case ◽  
Content Type ◽  
Proposed Model

Purpose – The purpose of this paper is to investigate the reliability analysis of a multi-state manufacturing system with different performance levels. In, fact, reliability assessment of manufacturing systems gives a reasonable demonstration of system performance. Design/methodology/approach – This research utilizes a multi-state system reliability analysis to develop a new metric for evaluating production systems. Findings – The proposed model provides a sensible measure to assess the system situation against the best-case scenario of a production line. Originality/value – The proposed model incorporates not only failures that stop production but also deals with partial failures where the system continues to operate at reduced performance rates. The analyses are represented in a best-case vs worst-case situation. Each of these cases provides insight for managers with respect to planning operation and maintenance activities.

The role of graining in ensuring food security

2020 ◽  
pp. 75-79
Author(s):  
R. M. Gambarova
Keyword(s):  
Food Security ◽  
Comparative Analysis ◽  
Systems Approach ◽  
Point Of View ◽  
Government Support ◽  
Grain Production ◽  
The Government ◽  
Favorable Conditions ◽  
Grain Farms

Relevance. Grain is the key to strategic products to ensure food security. From this point of view, the creation of large grain farms is a matter for the country's selfsufficiency and it leading to a decrease in financial expense for import. Creation of such farms creates an abundance of productivity from the area and leads to obtaining increased reproductive seeds. The main policy of the government is to minimize dependency from import, create abundance of food and create favorable conditions for export potential.The purpose of the study: the development of grain production in order to ensure food security of the country and strengthen government support for this industry.Methods: comparative analysis, systems approach.Results. As shown in the research, if we pay attention to the activities of private entrepreneurship in the country, we can see result of the implementation of agrarian reforms after which various types of farms have been created in republic.The role of privateentrepreneurshipinthedevelopmentofproduction is great. Тhe article outlines the sowing area, production, productivity, import, export of grain and the level of selfsufficiency in this country from 2015 till 2017.

scholarly journals On investigation of the Bayesian anomaly in multiple imprecise dependent information aggregation for system reliability evaluation

2021 ◽  
Vol 36 (6) ◽  
pp. 2895-2921
Author(s):  
Lechang Yang ◽  
Pidong Wang ◽  
Wenhua Zhao ◽  
Chenxing Wang ◽  
Xiuli Wu ◽  
...  
Keyword(s):  
System Reliability ◽  
Information Aggregation ◽  
Reliability Evaluation

Comparison of the reluctance laminated and solid rotor synchronous machine operating at high temperatures

2019 ◽  
Vol 38 (4) ◽  
pp. 1111-1119 ◽  
Author(s):  
Marcin Lefik ◽  
Krzysztof Komeza ◽  
Ewa Napieralska-Juszczak ◽  
Daniel Roger ◽  
Piotr Andrzej Napieralski
Keyword(s):  
High Speed ◽  
Design Methodology ◽  
Three Dimensional ◽  
Synchronous Machine ◽  
Point Of View ◽  
Heat Sources ◽  
Model Calculations ◽  
Content Type ◽  
Thermal Phenomenon ◽  
Practical Implications

Purpose The purpose of this paper is to present a comparison between reluctance synchronous machine-enabling work at high internal temperature (HT° machine) with laminated and solid rotor. Design/methodology/approach To obtain heat sources for the thermal model, calculations of the electromagnetic field were made using the Opera 3D program including effect of rotation and the resulting eddy current losses. To analyse the thermal phenomenon, the 3D coupled thermal-fluid (CFD) model is used. Findings The presented results show clearly that laminated construction is much better from a point of view of efficiency and temperature. However, solid construction can be interesting for high speed machines due to their mechanical robustness. Research limitations/implications The main problem, despite the use of parallel calculations, is the long calculation time. Practical implications The obtained simulation and experimental results show the possibility of building a machine operating at a much higher ambient temperature than it was previously produced for example in the vicinity of the aircraft turbines. Originality/value The paper presents the application of fully three-dimensional coupled electromagnetic and thermal analysis of new machine constructions designed for elevated temperature.

Journey towards best practices in acting on early warning signs in complex projects within a Russian context

2015 ◽  
Vol 8 (4) ◽  
pp. 828-843 ◽  
Author(s):  
Gulnara Sharaborova ◽  
Derek H.T. Walker ◽  
Guinevere Gilbert
Keyword(s):  
Early Warning ◽  
Point Of View ◽  
Warning Signs ◽  
Theory And Practice ◽  
Doctoral Study ◽  
Content Type ◽  
Early Warning Signs ◽  
Complex Projects ◽  
Research Findings ◽  
Phd Thesis

Purpose – The purpose of this paper is to provide a summary report and reflect on a recently passed PhD thesis (Sharaborova, 2014b) related to project management topics. Design/methodology/approach – This paper focussed on narrative reflection upon the completed doctoral journey. Findings – This paper presents the thesis findings, the research models, the guide in dealing with the early warning signs that developed as a result of this research and the contribution made to theory and practice. Research limitations/implications – Limitations of the research and the perspectives of the further diffusion of the research findings are considered. Originality/value – This TRN is a PhD candidate’s point of view as well as the opinions of the scientific research supervisors about the doctoral study and its outcome. The paper could be useful for novice researchers who wish to conduct their research and did not yet make a decision.

A Dynamic Service Pool Size Configuration Mechanism for Service-Oriented Workflow

2011 ◽  
Vol 186 ◽  
pp. 499-504 ◽  
Author(s):  
Pan He ◽  
Jie Xu ◽  
Kai Gui Wu ◽  
Jun Hao Wen
Keyword(s):  
System Reliability ◽  
Environmental Changes ◽  
Point Of View ◽  
Pool Size ◽  
Reliability Model ◽  
Optimal Method ◽  
Service Oriented ◽  
Overall Reliability

Service-oriented workflows are the fundamental structures in service-oriented applications and changes in the workflow could cause dramatic changes in system reliability. In several ways to re-heal workflows in execution, re-sizing service pools in the workflow is practical and easy to implement. In order to quickly adjust to workflow or environmental changes, this paper presents a dynamic service pool size configuration mechanism from the point of view of maintaining workflow reliability. An architecture-based reliability model is used to evaluate the overall reliability of a workflow with service pools and an optimal method is proposed to get the combination of service pool size aiming at minimizing the sum of service pool size subject to the workflow reliability requirement. A case study is used to explain this method and experiment results show how to change service pool size to meet the workflow reliability requirements.

Economic thought in the 17th and 18th centuries: a linguistic approach

2015 ◽  
Vol 23 (3) ◽  
pp. 260-270
Author(s):  
Iara Vigo de Lima
Keyword(s):  
Economic Thought ◽  
Point Of View ◽  
Content Type ◽  
Front Position ◽  
History Of ◽  
Epistemological Model ◽  
Theory Of Language ◽  
Theory Of Value ◽  
Linguistic Approach ◽  
Practical Implications

Purpose – The purpose of this paper is to analyse Michel Foucault’s new epistemological model regarding an analogy between the theory of language and economic thought in the seventeenth and eighteenth centuries. Design/methodology/approach – Through the scrutiny of language, Foucault intended to demonstrate that some analogies, among different branches of knowledge (interdiscursive practice), allow us to apprehend the underlying configuration of thought regarding ontological and epistemological conditions that have historically determined knowledge. He draws a parallel between four theoretical segments borrowed from general grammar (Attribution, Articulation, Designation and Derivation) and economic thought on wealth. Findings – One of the most remarkable propositions of this approach is that the theory of language and economic thought were epistemologically isomorphic in that context. What the theory of language stated in relation to “attribution” and “articulation” corresponded to the “theory of value” in economic thought. What grammar investigated regarding “designation” and “derivation” was analogous to the “theory of money and trade” in economic thought. The relationships that were – directly and diagonally – identified between and among them led to the conclusion that there was ‘a circular and surface causality’ in economic thought insofar as “circulation” preceded “production”. It was “superficial” because it could not find an explanation for the cause of “wealth”, which was only possible when “production” was placed in the front position of theories. Practical implications – Such an epistemological point of view can inspire other studies in the history of economic thought. Originality/value – This paper offers a perspective on how to think about the history of ontological and epistemological conditions of economic thought.

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