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Article
Publication date: 23 April 2018

Siddharth Suhas Kulkarni, Craig Chapman, Hanifa Shah and David John Edwards

The purpose of this paper is to conduct a comparative analysis between a straight blade (SB) and a curved caudal-fin tidal turbine blade (CB) and to examine the aspects…

Abstract

Purpose

The purpose of this paper is to conduct a comparative analysis between a straight blade (SB) and a curved caudal-fin tidal turbine blade (CB) and to examine the aspects relating to geometry, turbulence modelling, non-dimensional forces lift and power coefficients.

Design/methodology/approach

The comparison utilises results obtained from a default horizontal axis tidal turbine with turbine models available from the literature. A computational design method was then developed and implemented for “horizontal axis tidal turbine blade”. Computational fluid dynamics (CFD) results for the blade design are presented in terms of lift coefficient distribution at mid-height blades, power coefficients and blade surface pressure distributions. Moving the CB back towards the SB ensures that the total blade height stays constant for all geometries. A 3D mesh independency study of a “straight blade horizontal axis tidal turbine blade” modelled using CFD was carried out. The grid convergence study was produced by employing two turbulence models, the standard k-ε model and shear stress transport (SST) in ANSYS CFX. Three parameters were investigated: mesh resolution, turbulence model, and power coefficient in the initial CFD, analysis.

Findings

It was found that the mesh resolution and the turbulence model affect the power coefficient results. The power coefficients obtained from the standard k-ε model are 15 to 20 per cent lower than the accuracy of the SST model. Further analysis was performed on both the designed blades using ANSYS CFX and SST turbulence model. The variation in pressure distributions yields to the varying lift coefficient distribution across blade spans. The lift coefficient reached its peak between 0.75 and 0.8 of the blade span where the total lift accelerates with increasing pressure before drastically dropping down at 0.9 onwards due to the escalating rotational velocity of the blades.

Originality/value

The work presents a computational design methodological approach that is entirely original. While this numerical method has proven to be accurate and robust for many traditional tidal turbines, it has now been verified further for CB tidal turbines.

Details

International Journal of Building Pathology and Adaptation, vol. 36 no. 2
Type: Research Article
ISSN: 2398-4708

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Article
Publication date: 5 February 2018

Siddharth Kulkarni, Craig Chapman, Hanifa Shah, Erika Anneli Parn and David John Edwards

This paper aims to conduct a comprehensive literature review in the tidal energy physics, the ocean environment, hydrodynamics of horizontal axis tidal turbines and bio-mimicry.

Abstract

Purpose

This paper aims to conduct a comprehensive literature review in the tidal energy physics, the ocean environment, hydrodynamics of horizontal axis tidal turbines and bio-mimicry.

Design/methodology/approach

The paper provides an insight of the tidal turbine blade design and need for renewable energy sources to generate electricity through clean energy sources and less CO2 emission. The ocean environment, along with hydrodynamic design principles of a horizontal axis tidal turbine blade, is described, including theoretical maximum efficiency, blade element momentum theory and non-dimensional forces acting on tidal turbine blades.

Findings

This review gives an overview of fish locomotion identifying the attributes of the swimming like lift-based thrust propulsion, the locomotion driving factors: dorsal fins, caudal fins in propulsion, which enable the fish to be efficient even at low tidal velocities.

Originality/value

Finally, after understanding the phenomenon of caudal fin propulsion and its relationship with tidal turbine blade hydrodynamics, this review focuses on the implications of bio-mimicking a curved caudal fin to design an efficient horizontal axis tidal turbine.

Details

Journal of Engineering, Design and Technology, vol. 16 no. 1
Type: Research Article
ISSN: 1726-0531

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Article
Publication date: 12 September 2016

Gerald Feldman, Hanifa Shah, Craig Chapman and Ardavan Amini

Enterprise systems (ES) upgrade is a complex phenomenon, yet it is possible to reduce the complexity through understanding of the upgrade drivers. The purpose of this…

Abstract

Purpose

Enterprise systems (ES) upgrade is a complex phenomenon, yet it is possible to reduce the complexity through understanding of the upgrade drivers. The purpose of this paper is to investigate the various upgrade drivers, in order to provide a detailed understanding of the factors driving upgrade decisions.

Design/methodology/approach

This research is grounded in a qualitative survey design. It utilises a web-based survey questionnaire and semi-structured interviews to collect data from 41 respondents representing 23 large organisations. The data were qualitatively analysed and coded to identify the various drivers and their influence on ES upgrade decisions.

Findings

The findings suggest that the upgrade decisions are dependent on establishing the need to upgrade, which is influenced by various drivers and stakeholders interests. In addition, the findings suggest that organisations would only opt to upgrade when benefits are aligned with the upgrade and when the decision makes business sense.

Research limitations/implications

In this paper, the authors propose that there is a relationship between the upgrade drivers and the upgrade strategy. However, qualitative studies can only formulate logical generalisations. Hence, future research could explore these associations through a quantitative study in order to provide probabilistic generalisation that offers either similar or conflicting arguments applicable to ES upgrade phenomenon.

Originality/value

This paper provides an alternative classification of upgrade drivers, and conceptualises an association between upgrade drivers and the upgrade strategy, which in turn facilitates minimising disruptions and upgrade risks.

Details

Industrial Management & Data Systems, vol. 116 no. 8
Type: Research Article
ISSN: 0263-5577

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Case study
Publication date: 20 January 2017

Craig J Chapman

In the (A) case, Jason Phillips, Chief Financial Officer of a soup manufacturing business, is given the task of maximizing the value of the firm twelve months after the…

Abstract

In the (A) case, Jason Phillips, Chief Financial Officer of a soup manufacturing business, is given the task of maximizing the value of the firm twelve months after the case is set. Although he does not want to break any legal rules, Jason is interested to see whether accounting and real action choices can be used to enhance the company's financial position and increase its perceived value to investors. The case permits him to select from a menu of options, including decisions on product pricing, inventory levels, accounts receivables, leasing or purchasing a new machine and valuation or sale of securities. These choices are fed into an Excel spreadsheet which adjusts financial projections and accounting disclosures accordingly.

In the (B) case, Ben Kerr, Chief Investment Officer at one of Dragon's main competitors, considers the financial statements produced by Dragon to unravel any earnings management behavior and establish a true value for the company. Although the case can be focused on the accounting consequences of real decisions, a richer discussion is obtained when considering the ethical angles of the decision process. In particular, how much “earnings management” should be pursued and what types of behaviors are simply going to be unraveled by investors?

Students will explore: the concepts of “legal” earnings management as compared to true value optimization; whether sophisticated investors misled by such behaviors; and the management of information flows to investors.

Details

Kellogg School of Management Cases, vol. no.
Type: Case Study
ISSN: 2474-6568
Published by: Kellogg School of Management

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Case study
Publication date: 20 January 2017

Craig J Chapman

In the (A) case, Jason Phillips, Chief Financial Officer of a soup manufacturing business, is given the task of maximizing the value of the firm twelve months after the…

Abstract

In the (A) case, Jason Phillips, Chief Financial Officer of a soup manufacturing business, is given the task of maximizing the value of the firm twelve months after the case is set. Although he does not want to break any legal rules, Jason is interested to see whether accounting and real action choices can be used to enhance the company's financial position and increase its perceived value to investors. The case permits him to select from a menu of options, including decisions on product pricing, inventory levels, accounts receivables, leasing or purchasing a new machine and valuation or sale of securities. These choices are fed into an Excel spreadsheet which adjusts financial projections and accounting disclosures accordingly.

In the (B) case, Ben Kerr, Chief Investment Officer at one of Dragon's main competitors, considers the financial statements produced by Dragon to unravel any earnings management behavior and establish a true value for the company. Although the case can be focused on the accounting consequences of real decisions, a richer discussion is obtained when considering the ethical angles of the decision process. In particular, how much “earnings management” should be pursued and what types of behaviors are simply going to be unraveled by investors?

Students will explore: the concepts of “legal” earnings management as compared to true value optimization; whether sophisticated investors misled by such behaviors; and the management of information flows to investors.

Details

Kellogg School of Management Cases, vol. no.
Type: Case Study
ISSN: 2474-6568
Published by: Kellogg School of Management

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Article
Publication date: 12 December 2018

Siddharth Kulkarni, David John Edwards, Craig Chapman, M. Reza Hosseini and De-Graft Owusu-Manu

Road passenger transportation faces a global challenge of reducing environmental pollution and greenhouse gas emissions because of the vehicle weight increases needed to…

Abstract

Purpose

Road passenger transportation faces a global challenge of reducing environmental pollution and greenhouse gas emissions because of the vehicle weight increases needed to enhance passenger safety and comfort. This paper aims to present a preliminary mechanical design evaluation of the Wikispeed Car (with a focus on body bending, body torsion and body crash) to assess light-weighting implications and improve the vehicle’s environmental performance without compromising safety.

Design/methodology/approach

For this research, finite element analysis (FEA) was performed to examine the Wikispeed chassis for light-weighting opportunities in three key aspects of the vehicle’s design, namely, for body bending the rockers (or longitudinal tubes), for body torsion (again on the rockers but also the chassis as a whole) and for crash safety – on the frontal crash structure. A two-phase approach was adopted, namely, in phase one, a 3D CAD geometry was generated and in phase, two FEA was generated. The combination of analysis results was used to develop the virtual model using FEA tools, and the model was updated based on the correlation process.

Findings

The research revealed that changing the specified material Aluminium Alloy 6061-T651 to Magnesium EN-MB10020 allows vehicle mass to be reduced by an estimated 110 kg, thus producing a concomitant 10 per cent improvement in fuel economy. The initial results imply that the current beam design made from magnesium would perform worst during a crash as the force required to buckle the beam is the lowest (between 95.2 kN and 134 kN). Steel has the largest bandwidth of force required for buckling and also requires the largest force for buckling (between 317 kN and 540 kN).

Originality/value

This is the first study of its kind to compare and contrast between material substitution and its impact upon Wikispeed car safety and performance.

Details

Journal of Engineering, Design and Technology, vol. 17 no. 1
Type: Research Article
ISSN: 1726-0531

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Article
Publication date: 4 December 2017

Gerald Feldman, Hanifa Shah, Craig Chapman, Erika A. Pärn and David J. Edwards

Enterprise systems (ES) upgrade is fundamental to maintaining a system’s continuous improvement and stability. However, while the extant literature is replete with…

Abstract

Purpose

Enterprise systems (ES) upgrade is fundamental to maintaining a system’s continuous improvement and stability. However, while the extant literature is replete with research on ES upgrade decision-making, there is scant knowledge about how different decision processes facilitate this decision to upgrade. This paper aims to investigate and better understand these processes from an organisational perspective.

Design/methodology/approach

The study adopted a qualitative survey design, and used a Web-based questionnaire and semi-structured interviews to collect data from 23 large organisations. Data accrued were qualitatively analysed and manually coded to identify the various decision processes undertaken during ES upgrade decisions.

Findings

Analysis results reveal complex interrelations between the upgrade drivers, the need to evaluate the new version’s functionality and the upgrade impact. Understanding the interaction between these elements influences the upgrade decision process.

Research limitations/implications

The study proposes ES upgrade processes that support a decision to upgrade major releases. Further research is required to offer either similar or conflicting arguments on the upgrade decision-making and provide a probabilistic generalisation of the decision-making processes.

Originality/value

The research offers a comprehensive and empirically supported methodical approach that embraces an evaluation of a new version’s functionality, technical requirements and concomitant upgrade implications as intrinsic decision processes. This approach assists in the decisions to establish the upgrade need and determine the level of change, effort required, impacts and associated benefits.

Details

Journal of Engineering, Design and Technology, vol. 15 no. 6
Type: Research Article
ISSN: 1726-0531

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Article
Publication date: 10 October 2016

Gerald Feldman, Hanifa Shah, Craig Chapman and Ardavan Amini

Enterprise systems (ES) upgrade is a complex undertaking that recurs throughout the systems’ life span, therefore, organisations need to adopt strategies and methodologies…

Abstract

Purpose

Enterprise systems (ES) upgrade is a complex undertaking that recurs throughout the systems’ life span, therefore, organisations need to adopt strategies and methodologies that can minimise disruptions and risks associated with upgrades. The purpose of this paper is to explore the processes undertaken during upgrading ES, to identify the upgrade project stages.

Design/methodology/approach

This research is grounded in a qualitative survey approach, and utilises a web-based survey questionnaire and semi-structured interviews as methods for data collection. The data were gathered from 41 respondents’ and analysed using qualitatively inductive content analysis principles to derive meaning and to identify the trends about upgrade processes.

Findings

The study findings stress the importance of adopting a methodical approach to ES upgrades. Also, it suggests that due consideration should be given to the impact of new version features and functionality, the risks and the effort required for supporting upgrade projects.

Research limitations/implications

The five-stage upgrade process model can be utilised as a strategy to minimise complexity and risks associated with upgrade projects. However, this study only proposes logical generalisations; therefore, future studies could explore these stages in-depth to offer generalisable arguments applicable to ES upgrade phenomenon.

Originality/value

The study proposes a five-stage upgrade process model that offers a systematic approach to support upgrade projects. The proposed model extends previous models by proposing alternative strategies to support ES upgrade projects.

Details

Journal of Enterprise Information Management, vol. 29 no. 6
Type: Research Article
ISSN: 1741-0398

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Article
Publication date: 30 October 2018

Siddharth Kulkarni, David John Edwards, Erika Anneli Parn, Craig Chapman, Clinton Ohis Aigbavboa and Richard Cornish

Vehicle weight reduction represents a viable means of meeting tougher regulatory requirements designed to reduce fuel consumption and control greenhouse gas emissions…

Abstract

Purpose

Vehicle weight reduction represents a viable means of meeting tougher regulatory requirements designed to reduce fuel consumption and control greenhouse gas emissions. This paper aims to present an empirical and comparative analysis of lightweight magnesium materials used to replace conventional steel in passenger vehicles with internal combustion engines. The very low density of magnesium makes it a viable material for lightweighting given that it is lighter than aluminium by one-third and steel by three-fourth.

Design/methodology/approach

A structural evaluation case study of the “open access” Wikispeed car was undertaken. This included an assessment of material design characteristics such as bending stiffness, torsional stiffness and crashworthiness to evaluate whether magnesium provides a better alternative to the current usage of aluminium in the automotive industry.

Findings

The Wikispeed car had an issue with the rocker beam width/thickness (b/t) ratio, indicating failure in yield instead of buckling. By changing the specified material, Aluminium Alloy 6061-T651 to Magnesium EN-MB10020, it was revealed that vehicle mass could be reduced by an estimated 110 kg, in turn improving the fuel economy by 10 per cent. This, however, would require mechanical performance compromise unless the current design is modified.

Originality/value

This is the first time that a comparative analysis of material substitution has been made on the Wikispeed car. The results of such work will assist in the lowering of harmful greenhouse gas emissions and simultaneously augment fuel economy.

Details

Journal of Engineering, Design and Technology, vol. 16 no. 6
Type: Research Article
ISSN: 1726-0531

Keywords

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Abstract

Details

Corporate Fraud Exposed
Type: Book
ISBN: 978-1-78973-418-8

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