The dynamic performance analysis of chevron shape textured hydrodynamic bearings

2019 ◽  
Vol 72 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Gourav Jamwal ◽  
Sanjay Sharma ◽  
R.K. Awasthi
Keyword(s):  
Reynolds Equation ◽  
Dynamic Performance ◽  
The Finite Element Method ◽  
Maximum Increase ◽  
Maximum Enhancement ◽  
Content Type ◽  
Texture Parameters ◽  
Dynamic Performance Analysis ◽  
Practical Implications ◽  
Selection Of

Purpose This paper aims to evaluate the various dynamic performance parameters of hydrodynamic journal bearings. For this, the bearing’s inner surface is textured with chevron-shaped textures with different texture depths and number of textures in different regions/locations. Design/methodology/approach In the present study, the effect of chevron-shaped texture having different values of texture depths, locations and number of textures has been numerically simulated. The dynamic performance characteristics have been calculated by solving the fluid flow governing Reynolds equation using the finite element method, assuming iso-viscous and Newtonian fluid. Findings The obtained results indicate that the bearing stability can be improved with the help of surface texture. Among all the investigated texture locations, the maximum increase in stability threshold speed is observed for fully textured distribution. Moreover, for the chevron-shaped texture considered in the present study, the optimum values of texture depth and number of textures have also been determined for maximum bearing stability. Practical implications While designing, designers should focus on those optimum values of texture depth, texture location and number of textures which lead to maximum enhancement in bearing stability. Originality/value This study is useful in the appropriate selection of chevron-shaped texture parameters on bearing surface for the maximum bearing stability.

Reflections on the theme issue outcomes

2016 ◽  
Vol 8 (4) ◽  
pp. 504-510
Author(s):  
Gunjan M. Sanjeev ◽  
Richard Teare
Keyword(s):  
Customer Service ◽  
Hospitality Industry ◽  
Theme Issue ◽  
Policy Makers ◽  
Content Type ◽  
Starting Point ◽  
Cost Competitiveness ◽  
Hotel Sector ◽  
Practical Implications ◽  
Selection Of

Purpose The paper aims to profile the theme issue of Worldwide Hospitality and Tourism Themes titled “How is the need for innovation being addressed by the Indian hospitality industry?” with reference to the experiences of the theme editor, contributors from the industry and academia and the theme issue outcomes. Design/methodology/approach The paper uses structured questions to enable the theme editor to reflect on the rationale for their theme issue question, the starting-point, the selection of the writing team and material and the editorial process. Findings It highlights recent innovations that have taken place in the Indian hospitality industry especially in the areas of customer service, cost competitiveness, culinary management, revenue management and technology. Practical implications As hotel sector investment in India intensifies, this theme issue will be of interest to hoteliers, policy makers, analysts and others interested in the role that innovation can play in helping to facilitate differentiation between competing hotel products and services. Originality/value There is limited literature available on industry innovations in the Indian context. All the papers in this theme issue were written after several cycles of interaction between academics and practitioners and so they incorporate real–time, relevant and contemporary data.

Design and topological optimization of rear pressure bulkhead for a typical aircraft

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Marshal Thakran ◽  
Meenakshi ◽  
Jitender Sharma ◽  
Charles Gilbert Martin
Keyword(s):  
Numerical Analysis ◽  
Significant Influence ◽  
Design Methodology ◽  
Structural Integrity ◽  
Topological Optimization ◽  
Content Type ◽  
Iterative Design ◽  
Practical Implications ◽  
Insight Into ◽  
Selection Of

Purpose The purpose of this paper is to evaluate the model of a rear pressure bulkhead with different design optimizations to meet the pressurized cabin requirements of an aircraft. Design/methodology/approach This paper presents the results of the static analysis of a dome-shaped rear pressure bulkhead model designed in Catia-v5. Numerical analysis of model meshed in hyper-mesh and solved using Opti-Struct for iterative design optimizations. Findings All the iterative models are analyzed at 9 Psi. Rear pressure bulkhead designed with L-section stringer shows better results than the model optimized with T-section stringer for the same thickness. The model optimized with L-shaped stinger also reduces the weight of the bulkhead without affecting the structural integrity. Practical implications It has been concluded in this paper that the selection of specific shapes of the stringers shows a significant influence on weight reduction. Originality/value This paper provides a topical, technical insight into the design and development of a rear pressure bulkhead. It also outlines the future development of dome-shaped rear pressure bulkhead.

“Hold them or fold them:” evidence-based decisions to discontinue investigations of non-domestic minor violence

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Kent McFadzien ◽  
Lawrence W. Sherman
Keyword(s):  
Design Methodology ◽  
False Negative ◽  
False Negative Rate ◽  
Random Selection ◽  
Content Type ◽  
Continuous Basis ◽  
Randomised Controlled ◽  
Practical Implications ◽  
Full Investigation ◽  
Selection Of

PurposeThe purpose of this paper is to demonstrate a “maintenance pathway” for ensuring a low false negative rate in closing investigations unlikely to lead to a clearance (detection).Design/methodology/approachA randomised controlled experiment testing solvability factors for non-domestic cases of minor violence.FindingsA random selection of 788 cases, of which 428 would have been screened out, were sent forward for full investigation. The number of cases actually detected was 22. A total of 19 of these were from the 360 recommended for allocation. This represents an improvement of accuracy over the original tests of the model three years earlier.Research limitations/implicationsThis study shows how the safety of an investigative triage tool can be checked on a continuous basis for accuracy in predicting the cases unlikely to be solved if referred for full investigations.Practical implicationsThis safety check pathway means that many more cases can be closed after preliminary investigations, thus saving substantial time for working on cases more likely to yield a detection if sufficient time is put into the cases.Social implicationsMore offenders may be caught and brought to justice by using triage with a safety backstop for accurate forecasting.Originality/valueThis is the first published study of a maintenance pathway based on a random selection of cases that would otherwise not have been investigated. If widely applied, it could yield far greater time for police to pursue high-harm, serious violence.

Frequency dependent resistance calculation of multiple conductors

2017 ◽  
Vol 36 (5) ◽  
pp. 1396-1410
Author(s):  
Tomislav Župan ◽  
Bojan Trkulja
Keyword(s):  
Design Methodology ◽  
Numerical Approach ◽  
Effective Resistance ◽  
Proximity Effects ◽  
The Finite Element Method ◽  
Frequency Range ◽  
Frequency Dependent ◽  
Content Type ◽  
Electromagnetic Devices ◽  
Practical Implications

Purpose The purpose of this paper is to present a method for calculating frequency-dependent resistance when multiple current-carrying conductors are present. Design/methodology/approach Analytical and numerical formulations are presented. Both skin- and proximity-effects are considered in the numerical approach, whereas only skin-effect can be taken into account in analytical equations. The calculation is done using a self-developed integral equation-based field solver. The results are benchmarked using professional software based on the finite element method (FEM). Findings Results from the numerical approach are in agreement with FEM-based software throughout the whole frequency range. Analytical formulations yield unsatisfactory results in higher frequency range. When multiple conductors are mutually relatively close, the proximity-effect has an impact on effective resistance and has to be taken into account. Research limitations/implications The methodology is presented using axially symmetrical conductors. However, the same procedure can be developed for straight conductors as well. Practical implications Presented fast and stable procedure can be used in most electromagnetic devices when frequency-dependent resistance needs to be precisely determined. Originality/value The value of the presented numerical methodology lies in its ability to take both skin- and proximity-effects into account. As conductors are densely packed in most electromagnetic devices, both effects influence the effective resistance. The method can be easily implemented using a self-developed solver and yields satisfactory results.

The soul of resilience

Kybernetes ◽  
2019 ◽  
Vol 48 (4) ◽  
pp. 672-684 ◽  
Author(s):  
Pille Bunnell
Keyword(s):  
Design Methodology ◽  
Open Space ◽  
Ecological Context ◽  
Dynamic Flow ◽  
Content Type ◽  
Ethical Concerns ◽  
Effective Care ◽  
Relational Embeddedness ◽  
Practical Implications ◽  
Selection Of

Purpose Rather than an attempt to define or clarify resilience in terms of its characteristics, or its correspondence to reality, this paper is a series of reflections that leads to the notion of resilience as a way of being in the world. What is presented is not intended to be conclusive in any way. The paper aims to trigger thoughtful reflections that will lead to further conversations about the entailments and ethical concerns implicit in the concept of resilience. Design/methodology/approach The paper comprises reflections based on a selection of published ideas, as well as on personal engagement in the domains of ecology and the biology of cognition. In postulating that resilience may have a central, ineffable quality, the phrase “soul of” has been used as an approach to considering what such a quality may be. This formulation leads to a consideration about the nature of our relationships with the other such that the notion of resilience has become meaningful. Findings Language parses or chunks named ideas in a way that reveals some regularities and obscures others. The word resilience is one such chunk that historically has changed its meaning. Furthermore in the present the word refers to variable aspects or elements depending on the context of its usage. In the ecological context, resilience entails an ambiguous balance between persistence and change, and indeed this ambiguity may be necessary to accommodate the complexities. In all cases the author has considered, we are only concerned with resilience where there is an ethical dimension and this, inherently, must be multidimensional given the complexities of the systems being regarded. The author claims that the soul of resilience arises through an ethically oriented reflexive awareness of our dynamic flow in a relational embeddedness. Practical implications The practical implications of this paper are elusive, yet meaningful, as the paper attempts to open space for operating in an ethical and useful manner with ambiguous concepts and for avoiding the hubris of certainty. The paper is an explication of one of the ways of thinking inspired by second order science. Originality/value As the reflections in this paper are largely those original to the author, the ideas are original. Whether they have value depends on what ideas, attitudes, orientations and further reflections are triggered and whether these in turn implicitly or explicitly alter actions toward more effective care of our world. If reflection on resilience increases resilience, then this paper will have value.

Information literacy assessment by portfolio: a case study

2007 ◽  
Vol 35 (1) ◽  
pp. 41-70 ◽  
Author(s):  
Valerie Sonley ◽  
Denise Turner ◽  
Sue Myer ◽  
Yvonne Cotton
Keyword(s):  
Learning Outcomes ◽  
Information Literacy ◽  
Assessment Method ◽  
Literacy Assessment ◽  
Content Type ◽  
Small Cohort ◽  
The University ◽  
Practical Implications ◽  
Selection Of

PurposeThe purpose of this paper is to report the results of a case study evaluating the revision of the assessment methods of an information literacy module. The revised assessment method took the form of a portfolio.Design/methodology/approachDuring 2004, all six credit modules at the University of Teesside had to be reviewed and restructured into ten credit modules. Following Biggs' principles of constructive alignment, the tutors looked at the existing module aims and learning outcomes. A review of the literature and previous experience informed the selection of the new assessment method by portfolio. An evaluation of the assessment method was undertaken after the module had run.FindingsThe paper finds that the assessment method had real strengths especially in terms of validity. It was also economical and efficient. Students knew what they were expected to do and where they needed to put in effort.Research limitations/implicationsThe assessment by a portfolio method has been carried out once with a relatively small cohort of students, so the findings can only be regarded as interim.Practical implicationsThe tutors believe that they have created a very useful module with an aligned assessment method which would be of benefit to a much greater number of studentsOriginality/valueThere is a shortage of publications that report the results of the use of portfolios for the assessment of information literacy.

Collaborative consumption sport hosting: value and consumption constraints

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Michael Goldman ◽  
Brandon Brown ◽  
Eric C. Schwarz
Keyword(s):  
Qualitative Content Analysis ◽  
Initial Study ◽  
Experience Design ◽  
Collaborative Consumption ◽  
Content Type ◽  
Consumption Experience ◽  
The Usa ◽  
Consumption Constraints ◽  
Practical Implications ◽  
Selection Of

PurposeThe purpose of this paper is to find evidence of the benefits and constraints of collaborative consumption experiences by investigating the perceptions of hosts and visitors that attended professional regular season basketball and baseball games in the USA.Design/methodology/approachData were collected through four focus groups with 37 total participants and were analyzed through qualitative content analysis.FindingsThe results show that participants in a collaborative consumption experience perceive four types of value: social interaction and belonging, new fandom, travel bucket list experiences and local and sport knowledge. In addition, the results provide evidence of five consumption constraints related to collaborative consumption: expenses, average experiences, seat location, interpersonal disconnects and personal risk.Research limitations/implicationsThe selection of only two sites for the study limited the data triangulation that was possible. This study should be replicated across a wider range of teams and countries to confirm the main findings of the study.Practical implicationsPractitioners can use this initial study to better understand the benefits hosts and visitors perceive in the experience, and therefore the kind of experience design that would encourage increased purchases and loyalty.Originality/valueThis paper provides qualitative insights into the benefits and detriments of a collaborative consumption sport experience, based on participants' involvement in an innovative peer-to-peer platform.

In-plane dynamic response of a hydraulic pipe subjected to random vibration

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Wei Qu ◽  
Huailiang Zhang ◽  
Wei Li ◽  
Ling Peng ◽  
Wenqian Sun
Keyword(s):  
Random Vibration ◽  
Tunnel Boring Machine ◽  
Transmission Efficiency ◽  
Hydraulic Systems ◽  
Analysis Method ◽  
The Finite Element Method ◽  
Characteristic Analysis ◽  
Content Type ◽  
Tunnel Boring ◽  
Selection Of

Purpose To improve the transmission efficiency and reduce the damage to pipes in the hydraulic systems of tunnel boring machine subjected to random vibration, this paper aims to propose a novel dynamic characteristic analysis method that considers random vibration. Design/methodology/approach A fluid-structure interaction motion equation of the pipe is established by using Hamilton’s principle. The finite element method and discrete analysis method of random vibration are used to construct a model of the dynamic behavior of the pipe. Findings The influences of fluid parameters and external excitation parameters on the dynamic characteristics of pipes are analyzed. The experimental results are found to be in good agreement with the simulation results, which demonstrates that the proposed analytical method can provide a theoretical reference for the design and selection of hydraulic pipes subjected to random vibration. Originality/value The proposed method can be regarded as a future calculation method for pipes subjected to random vibration, and the transmission efficiency of the pipe can be improved.

Exercising responsible leadership in a Singapore context

2018 ◽  
Vol 39 (1) ◽  
pp. 34-50 ◽  
Author(s):  
Carolyn Koh ◽  
Mario Fernando ◽  
Trevor Spedding
Keyword(s):  
National Culture ◽  
Effective Leadership ◽  
Analytical Techniques ◽  
Business Leaders ◽  
Responsible Leadership ◽  
Content Type ◽  
Face To Face ◽  
Practical Implications ◽  
Purposive Selection ◽  
Selection Of

Purpose The purpose of this paper is to explore the western developed notion of responsible leadership (RL) from a Singapore context. Design/methodology/approach Following the qualitative research tradition, face-to-face interviews with 20 influential Singaporean leaders were developed into case studies. Grounded theory methodology was applied to identify similarities and differences within and across cases. Findings The findings reveal that the interviewed Singaporean leaders projected traits and values consistent with western definitions of responsible and effective leadership. Findings also suggest that contextual factors such as national culture and the ethos of the nation as well as leaders’ relational intelligence influence RL. These factors also help responsible leaders to better manage the tension between responsible and effective leadership. Research limitations/implications The small and geographically bound sample size makes it difficult to generalise the findings of this study. As in other ethics studies, interviewees’ desire to present a socially desirable image of themselves could be high in this study. Finally, the methods and analytical techniques applied may be biased and be influenced by the purposive selection of the participants. Practical implications Singaporean business leaders may need to consider the importance of retaining and developing the national culture and ethos of the nation, since these are the factors that have been identified in this study as key to influencing RL. Originality/value This study identifies the factors that influence RL from a Singapore context. It extends the understanding of the mostly western-based multi-level theory of RL.

scholarly journals Engaging the multi-generational workforce in tourism and hospitality

2014 ◽  
Vol 69 (4) ◽  
pp. 245-263 ◽  
Author(s):  
Paul Barron ◽  
Anna Leask ◽  
Alan Fyall
Keyword(s):  
Employee Engagement ◽  
Generational Differences ◽  
Structured Interviews ◽  
Content Type ◽  
Mixed Methods Approach ◽  
Hospitality And Tourism ◽  
Tourism And Hospitality ◽  
The Relationship ◽  
Practical Implications ◽  
Selection Of

Purpose – The purpose of this study is to present strategies that hospitality and tourism organisations might adopt as a means of encouraging employee engagement, thus enabling the more effective management of an increasingly multi-generational workforce. This paper evaluates current strategies being adopted that might encourage employee engagement by a selection of hospitality and tourism organisations and develop recommendations for organisations wishing to more effectively engage the multi-generational workforce. Design/methodology/approach – This study adopts a mixed methods approach and presents findings based on a series of semi-structured interviews with management and self-completion questionnaires aimed at employees. Findings – The relationship between the supervisor and the employee remains a key enhancer regarding engagement and employees are increasingly demanding more contemporary methods of communication. Employers should take note of generational characteristics and adopt flexible policies attractive to all employees. Practical implications – This paper contributes no t only to the debate regarding generational differences in the workplace but it also identifies that the various generations evident in tourism organisations are desirous of similar working conditions and benefits. Organisations should consider the development of a range of packages that focus on linking employees with their purpose, their colleagues and their resources as a means of encouraging employee engagement. Originality/value – This study contributes to the debate regarding employee engagement and compares and contrasts initiatives that various tourism and hospitality organisations are adopting as a means of encouraging employee engagement. The study also elicits the views of the organisations employees to understand the extent of the effectiveness of such initiatives and makes recommendations regarding the most effective initiatives from both a management and employee perspective.

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