Correlation of base oil viscosity in grease with vibration severity of damaged rolling bearings

2018 ◽  
Vol 70 (2) ◽  
pp. 264-272 ◽  
Author(s):  
Imran Moulaalli Jamadar ◽  
Dipakkumar Vakharia
Keyword(s):  
Theoretical Model ◽  
Design Methodology ◽  
Oil Viscosity ◽  
Rolling Bearings ◽  
Content Type ◽  
Base Oil ◽  
Lubricant Oil ◽  
Bearing Failures ◽  
Different Types ◽  
Lubrication Condition

Purpose The main objective of the paper is to explore the theoretical correlation of base oil viscosity in grease and to study the effect of grease grade on mechanical vibrations associated with the damaged rolling bearings. Design/methodology/approach For theoretical purposes, formulation theory of dimensional analysis was implemented. Experiments were then performed on the test bearings lubricated with three different types of greases, namely, SKF LGHP2, SKF LGMT3 and SKF LGWA2. Findings The numerical results obtained from the theoretical model along with the results of experiments show that the vibration amplitudes of the defective bearings come down to a lower level when it is lubricated with the grease of a higher base oil viscosity. Research limitations/implications The promising results from the theoretical model make it usable for the practical rotating machineries applying a variety of the rolling bearings. Consequently, if the bearing is not severely damaged, its performance can be increased by lubricating it with thicker grease. Originality/value Despite many significant contributions in the field to detect the presence of defects, not many studies have been performed that relate the lubrication condition of the rolling bearings with the vibration response, because around 50-75% of the bearing failures are attributed to be lubrication related. Hence, there is need to develop a mathematical model that can correlate the vibration severity of the bearings with viscosity of the lubricant oil in the greases along with other design and operating parameters.

scholarly journals Advantages and potential challenges of data management in e-maintenance

2019 ◽  
Vol 25 (3) ◽  
pp. 378-396 ◽  
Author(s):  
Arian Razmi-Farooji ◽  
Hanna Kropsu-Vehkaperä ◽  
Janne Härkönen ◽  
Harri Haapasalo
Keyword(s):  
Data Management ◽  
Design Methodology ◽  
Management Practices ◽  
Future Research ◽  
Conceptual Approach ◽  
Content Type ◽  
Different Types ◽  
Maintenance Systems ◽  
Industry Leader ◽  
Practical Implications

Purpose The purpose of this paper is twofold: first, to understand data management challenges in e-maintenance systems from a holistically viewpoint through summarizing the earlier scattered research in the field, and second, to present a conceptual approach for addressing these challenges in practice. Design/methodology/approach The study is realized as a combination of a literature review and by the means of analyzing the practices on an industry leader in manufacturing and maintenance services. Findings This research provides a general understanding over data management challenges in e-maintenance and summarizes their associated proposed solutions. In addition, this paper lists and exemplifies different types and sources of data which can be collected in e-maintenance, across different organizational levels. Analyzing the data management practices of an e-maintenance industry leader provides a conceptual approach to address identified challenges in practice. Research limitations/implications Since this paper is based on studying the practices of a single company, it might be limited to generalize the results. Future research topics can focus on each of mentioned data management challenges and also validate the applicability of presented model in other companies and industries. Practical implications Understanding the e-maintenance-related challenges helps maintenance managers and other involved stakeholders in e-maintenance systems to better solve the challenges. Originality/value The so-far literature on e-maintenance has been studied with narrow focus to data and data management in e-maintenance appears as one of the less studied topics in the literature. This research paper contributes to e-maintenance by highlighting the deficiencies of the discussion surrounding the perspectives of data management in e-maintenance by studying all common data management challenges and listing different types of data which need to be acquired in e-maintenance systems.

Online brand communities as heterogeneous gatherings: a netnographic exploration of Apple users

2017 ◽  
Vol 26 (4) ◽  
pp. 375-385 ◽  
Author(s):  
Tuğba Özbölük ◽  
Yunus Dursun
Keyword(s):  
Design Methodology ◽  
Participant Observation ◽  
Opinion Leader ◽  
Brand Community ◽  
Community Members ◽  
Content Type ◽  
Brand Communities ◽  
Online Brand Communities ◽  
Different Types ◽  
Online Brand Community

Purpose This paper aims to investigate the different types of members based on their roles within an online brand community dedicated to Apple. Design/methodology/approach Design/methodology/approach Data are drawn from an 18-month netnographic study, including participant and non-participant observation. Findings Findings reveal that members of the online brand community share a common goal but they are heterogeneous in many respects. In this research, five different types of brand community members are identified: learner, pragmatist, activist, opinion leader and evangelist. These findings emphasize the heterogeneity of the brand community or the differences of members and subgroups they form in the community. Practical implications This paper offers some insights for brand managers. There are different sub-tribes in online brand communities and these sub-tribes develop their own meanings of the brand. This means that online brand communities do not form one single homogenous target group and can be segmented into subgroups. Findings also offer a deeper understanding of negative characteristics of online brand community members. The role “activist” found in this study may be crucial for marketers, as activists can represent the negative side of online brand communities. Originality/value The literature on brand communities has focused predominantly on the homogeneity of these communities. This paper extends the literature by demonstrating the heterogeneity in an online brand community. The paper contributes to the brand community literature by substantiating that online brand community members can be segmented into subgroups based on their roles within the community. In addition, the paper extends the existing literature on brand communities that has overlooked the destructive consumer roles.

Performance assessment of the complex repairable system with n-identical units under (k-out-of-n: G) scheme and copula linguistic repair approach

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
V. V. Singh ◽  
Abubakkar Idris Mohhammad ◽  
Kabiru Hamisu Ibrahim ◽  
Ibrahim Yusuf
Keyword(s):  
Complex System ◽  
Design Methodology ◽  
New Method ◽  
Social Implications ◽  
Repairable System ◽  
Variable Technique ◽  
Content Type ◽  
Different Types ◽  
Theoretical Assessment ◽  
Practical Implications

PurposeThis paper analyzed a complex system consisting n-identical units under a k-out-of-n: G; configuration via a new method which has not been studied by previous researchers. The computed results are more supportable for repairable system performability analysis.Design/methodology/approachIn this paper, the authors have analyzed a complex system consisting n-identical units under a k-out-of-n: G; configuration via a new method which has not been studied by previous researchers. The supplementary variable technique has employed for analyzing the performance of the system.FindingsReliability measures have been computed for different types of configuration. It generalized the results for purely series and purely parallel configurations.Research limitations/implicationsThis research may be beneficial for industrial system performances whereas a k-out-of-n-type configuration exists.Practical implicationsNot sure as it is a theoretical assessment.Social implicationsThis research may not have social implications.Originality/valueThis work is the sole work of authors that have not been communicated to any other journal before.

Career satisfaction antecedents of professional accounting returnees in international workplaces: an employee experience perspective

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Nga Thi Thuy Ho ◽  
Hung Trong Hoang ◽  
Pi-Shen Seet ◽  
Janice Jones ◽  
Nhat Tan Pham
Keyword(s):  
Design Methodology ◽  
Career Satisfaction ◽  
Home Country ◽  
Well Being ◽  
Cross Cultural ◽  
Cultural Work ◽  
Content Type ◽  
Different Types ◽  
Employee Experience ◽  
Practical Implications

PurposeThe purpose of this study is to examine the determinants of career satisfaction of professional accounting returnees who have studied and/or worked abroad and then returned to work in different types of international workplaces in their home country.Design/methodology/approachA survey of professional accounting returnees in Vietnam was undertaken and multiple regression analysis was applied to test the proposed relationships.FindingsThis study finds that career satisfaction is affected by career fit, career sacrifice, types of international workplaces (domestically headquartered firms versus globally headquartered firms) and cross-cultural work readjustment. Further, cross-cultural work readjustment partially mediates the effect of career fit and career sacrifice on career satisfaction.Practical implicationsThe research provides the basis for designing career-related employee experiences to support career satisfaction of professional accounting returnees.Originality/valueThis study integrates dimensions of career embeddedness with cross-cultural work readjustment and employee experiences, which are normally studied separately, in different types of international workplaces. It contributes to the limited research on contributors to well-being in the form of career satisfaction among professional returnees in an emerging economy.

An investigation into the Community of Inquiry model in the Malaysian ESL learners’ context

2017 ◽  
Vol 14 (3) ◽  
pp. 246-263
Author(s):  
Nagaletchimee Annamalai
Keyword(s):  
Creative Thinking ◽  
Design Methodology ◽  
Community Of Inquiry ◽  
Cognitive Presence ◽  
Online Environment ◽  
Content Type ◽  
Different Types ◽  
Emerging Themes ◽  
Esl Learners ◽  
Writing Task

Purpose This study aims to explore how the Community of Inquiry (CoI) model (2000) is used to categorize students’ and teachers’ interactions in an asynchronous discussion and how these interactions are able to help students add quality to their narrative writing. Design/methodology/approach The interactions were categorized based on teaching, social and cognitive presences suggested by the CoI model. Data collection included online archives and students’ narrative essays. Content analysis was performed based on the presences suggested by the CoI model. Scores for the narrative essays were based on Tribble’s (1996) assessment scale. Findings The findings indicated that the interactions were significantly related to the cognitive, teaching and social presences. However, the cognitive presence indicated a distinctive pattern. As this was a qualitative study, there were emerging themes. The study found that critical thinking was minimal, as the writing task was related to creative thinking. Research limitations/implications It is suggested that writing in the online environment should also consider different types of writing. Originality/value The emerging themes can be used to enhance and complement the CoI model when used in the Malaysian setting.

scholarly journals A first-person theory of documentation

2019 ◽  
Vol 75 (1) ◽  
pp. 190-212 ◽  
Author(s):  
Tim Gorichanaz
Keyword(s):  
Theoretical Model ◽  
Design Methodology ◽  
Analytical Tool ◽  
First Person ◽  
Visual Artists ◽  
Art Making ◽  
Content Type ◽  
Person Perspective ◽  
Practical Implications ◽  
Person Experience

Purpose The purpose of this paper is to first articulate and then illustrate a descriptive theoretical model of documentation (i.e. document creation) suitable for analysis of the experiential, first-person perspective. Design/methodology/approach Three models of documentation in the literature are presented and synthesized into a new model. This model is then used to understand the findings from a phenomenology-of-practice study of the work of seven visual artists as they each created a self-portrait, understood here as a form of documentation. Findings A number of themes are found to express the first-person experience of art-making in these examples, including communicating, memories, reference materials, taking breaks and stepping back. The themes are discussed with an eye toward articulating what is shared and unique in these experiences. Finally, the themes are mapped successfully to the theoretical model. Research limitations/implications The study involved artists creating self-portraits, and further research will be required to determine if the thematic findings are unique to self-portraiture or apply as well to art-making, to documentation generally, etc. Still, the theoretical model developed here seems useful for analyzing documentation experiences. Practical implications As many activities and tasks in contemporary life can be conceptualized as documentation, this model provides a valuable analytical tool for better understanding those experiences. This can ground education and management decisions for those involved. Originality/value This paper makes conceptual and empirical contributions to document theory and the study of the information behavior of artists, particularly furthering discussions of information and document experience.

scholarly journals Putting resilient sustainability into strategy decisions – case studies

2018 ◽  
Vol 56 (7) ◽  
pp. 1598-1612 ◽  
Author(s):  
Julie Winnard ◽  
Jacquetta Lee ◽  
David Skipp
Keyword(s):  
Case Studies ◽  
Real World ◽  
Design Methodology ◽  
Strategic Decision ◽  
New Approach ◽  
Content Type ◽  
Industrial Companies ◽  
Different Types ◽  
Strategic Decision Support ◽  
Practical Implications

Purpose The purpose of this paper is to report the results of testing a new approach to strategic sustainability and resilience – Sustainable Resilient Strategic Decision-Support (SuReSDS™). Design/methodology/approach The approach was developed and tested using action-research case studies at industrial companies. It successfully allowed the participants to capture different types of value affected by their choices, optimise each strategy’s resilience against different future scenarios and compare the results to find a “best” option. Findings SuReSDS™ enabled a novel integration of environmental and social sustainability into strategy by considering significant risks or opportunities for an enhanced group of stakeholders. It assisted users to identify and manage risks from different kinds of sustainability-related uncertainty by applying resilience techniques. Users incorporated insights into real-world strategies. Research limitations/implications Since the case studies and test organisations are limited in number, generalisation from the results is difficult and requires further research. Practical implications The approach enables companies to utilise in-house and external experts more effectively to develop sustainable and resilient strategies. Originality/value The research described develops theories linking sustainability and resilience for organisations, particularly for strategy, to provide a new consistent, rigorous and flexible approach for applying these theories. The approach has been tested successfully and benefited real-world strategy decisions.

Individual unlearning, organizational unlearning and strategic flexibility

2019 ◽  
Vol 14 (1) ◽  
pp. 2-18 ◽  
Author(s):  
Xiangyang Wang ◽  
Ying Qi ◽  
Yingxin Zhao
Keyword(s):  
Theoretical Model ◽  
Survey Data ◽  
Design Methodology ◽  
Mediating Effect ◽  
Strategic Flexibility ◽  
Content Type ◽  
Positive Effects ◽  
The Relationship

PurposeThe purpose of this paper is to explore the relationship between unlearning and strategic flexibility from the down-up change perspective.Design/methodology/approachDrawing on the routine-updating process, this study builds a theoretical model and examines it using survey data from 233 firms in China.FindingsUnlearning is the enabler to strategic flexibility. Specifically, individual unlearning and organizational unlearning both have positive effects on strategic flexibility. Organizational unlearning exerts a partly mediating effect on the relationship between individual unlearning and strategic flexibility.Originality/valueThe paper examines the different mechanisms of individual and organizational unlearning on strategic flexibility and suggests that unlearning is a useful method or approach for strategic flexibility. In addition, this study is useful to help managers or practitioners determine how to embrace strategic flexibility by unlearning.

Trust, risk and transaction intention in consumer-to-consumer e-marketplaces

2019 ◽  
Vol 119 (2) ◽  
pp. 331-350 ◽  
Author(s):  
Kangning Wei ◽  
Yuzhu Li ◽  
Yong Zha ◽  
Jing Ma
Keyword(s):  
Qualitative Study ◽  
Perceived Risk ◽  
Design Methodology ◽  
Future Research ◽  
Trust Building ◽  
Content Type ◽  
Online Transactions ◽  
Starting Point ◽  
Different Types ◽  
Practical Implications

Purpose The purpose of this paper is to compare the relative impacts of trust and risk on individual’s transaction intention in consumer-to-consumer (C2C) e-marketplaces from both the buyers’ and the sellers’ perspectives. Design/methodology/approach Two surveys were used to collect data regarding buyers’ and sellers’ perceptions and transaction intentions at a typical C2C e-marketplace. Partial least squares was used to analyze the data. A complementary qualitative study was conducted to triangulate the results from the quantitative study. Findings Institution-based trust (IBT) exerts a stronger influence on transaction intentions for buyers than for sellers. Sellers perceive a stronger impact of trust in intermediary (TII) than buyers on transaction intentions. The impacts of perceived risk in transactions are not different between buyers and sellers. Furthermore, IBT mediates the impacts of TII and perceived risk on transaction intentions for buyers. Research limitations/implications The results indicate that the impacts of trust and risk on transaction intention in e-marketplaces do differ between buyers and sellers. This suggests a need to further investigate the buyer–seller difference in online transactions. Practical implications Intermediaries need to focus on different types of trust-building mechanisms when attracting buyers and sellers to make transactions in the e-marketplace. Originality/value C2C e-marketplaces cannot survive without participation from both buyers and sellers. Most prior research is conducted from the buyers’ perspective. This research sets a starting point for future research to further explore the differences between buyers’ and sellers’ behavior in C2C e-commerce environments.

Too tied to fail: a multidimensional approach to social capital in crowdfunding campaigns. Evidences from Italian agri-food businesses

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ulpiana Kocollari ◽  
Alessia Pedrazzoli ◽  
Maddalena Cavicchioli ◽  
Andrea Girardi
Keyword(s):  
Social Capital ◽  
Design Methodology ◽  
Multidimensional Approach ◽  
Data Set ◽  
Content Type ◽  
Different Types ◽  
Linear Regressions ◽  
Practical Implications

PurposeThe authors investigate the contributions of social capital (SC) dimensions (bridging, bonding and linking) in crowdfunding campaigns by comparing the dynamics of agri-food businesses with those of two other sectors – cultural and technological.Design/methodology/approachThe authors develop linear regressions on a proprietary data set of 5,290 projects launched on the Italian platform “Produzionidalbasso.com”, from 2014 to 2020.FindingsThe authors’ findings suggest that combining the three social capital dimensions (bridging, bonding and linking) has a more substantial overall effect on the number of backers involved in agri-food projects than in cultural and technological projects. Agri-food entrepreneurs effectively mobilize all resources embedded in the SC dimensions and therefore create the conditions to develop new ties that financially support the project.Practical implicationsAgri-food entrepreneurs may benefit from those results improving their funding strategies. Therefore, agri-food entrepreneurs can explore and exploit the instruments available on the CFD platform – video and rewards associated with the campaign – gaining more benefit from the backers involved compared with other project categories.Originality/valueThe study proposes a broader perspective regarding SC that encompasses the proponent, the company and the campaign with three different types of ties: bonding, bridging and linking. These SC dimensions can differently shape diverse sectors and this eclectic configuration can differentiate the effects of SC in crowdfunding campaigns. This study pinpoints how crowdfunding determinants change, based on project categories.

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