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Article
Publication date: 9 March 2015

Lidui Wei, Haijun Wei, Shulin Duan and Yu Zhang

The purpose of this paper is to develop a good calculation model to accurately predict the lubrication characteristic of main bearings of diesel engine and improve the service…

1398

Abstract

Purpose

The purpose of this paper is to develop a good calculation model to accurately predict the lubrication characteristic of main bearings of diesel engine and improve the service life.

Design/methodology/approach

Based on the coupling of the whole flexible engine block and the flexible crankshaft reduced by the Component Mode Synthesis (CMS) method, considering mass-conserving boundary conditions, the average flow model equation and Greenwood/Tripp asperity contact theory, an elastohydrodynamic (EHD)-mixed lubrication model of the main bearings for the diesel engine is developed and researched with the finite volume method and the finite element method.

Findings

Obviously, the mixed lubrication of bearings is normal, while full hydrodynamic lubrication is transient. The results show that under the whole flexible block model, maximum oil film pressure, maximum asperity contact pressure and radial shell deformation decrease, while minimum oil film thickness increases. Oil flow over edge decreases, and so does friction loss. Therefore, coordination deformation ability of whole engine block is favorable to mean load. In the whole block model, friction contact happens on both upper shell and lower shell positions. In addition, average oil film fill ratio at the key position becomes smaller in the whole engine block model, and consequently increases the chances of cavitations erosion more. So, wearing resistance of both upper and lower shells and anti-cavitations erosion ability must be enhanced simultaneously.

Originality/value

Based on the coupling of the whole flexible engine block and the flexible crankshaft reduced by the CMS method, considering mass-conserving boundary conditions, the average flow model equation and Greenwood/Tripp asperity contact theory, an EHD-mixed lubrication model of the main bearings for the diesel engine is built, which can predict the lubrication of journal bearings more accurately.

Details

Industrial Lubrication and Tribology, vol. 67 no. 2
Type: Research Article
ISSN: 0036-8792

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Article
Publication date: 2 September 2014

Hsin Chen, Anastasia Papazafeiropoulou, Ta-Kang Chen, Yanqing Duan and Hsiu-Wen Liu

The purpose of this paper is to understand the factors which impact upon the consumers’ willingness to utilise company Facebook pages and e-word-of mouth by proposing and testing…

3680

Abstract

Purpose

The purpose of this paper is to understand the factors which impact upon the consumers’ willingness to utilise company Facebook pages and e-word-of mouth by proposing and testing a conceptual framework which is inspired by theories in marketing and information systems fields. The authors believe that only by applying both theories will provide a more complete understanding of the relationship between brand experience and Facebook. The research model attempts to illustrate the factors according to customers’ intrinsic and extrinsic motivations and their impact on brand experience, brand Facebook page loyalty and e-word-of-mouth (E-WOM).

Design/methodology/approach

The authors adopted an online survey method for data collection. The subjects the authors used were Facebook users. The data were collected in Taiwan over spring 2011. The authors then used the structural equation model to analyse the data collected.

Findings

The findings suggest that users are influenced by the technical characterises of a brand Facebook page, such as ease of use and usefulness, which might be combated by attempting to reduce customer effort when accessing Facebook pages. The authors conclude that customer effort influenced brand experience and consequently loyalty to brand Facebook pages and E-WOM.

Research limitations/implications

The limitations of this study relate to the investigation of consumer perspectives in a specific geographical context and time frame.

Originality/value

The study's contributions are both theoretical and practical, as it offers new insights into brand experience attitudes in an online environment and useful insights to companies willing to market themselves on Facebook.

Details

Journal of Enterprise Information Management, vol. 27 no. 5
Type: Research Article
ISSN: 1741-0398

Keywords

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Article
Publication date: 31 March 2023

Yansi Hou, Shuangye Chen and Shulin Yu

The professional development of novice teachers is receiving increased attention. Although conflict is regarded as an essential factor affecting the effectiveness of the school…

405

Abstract

Purpose

The professional development of novice teachers is receiving increased attention. Although conflict is regarded as an essential factor affecting the effectiveness of the school professional learning community, it is often hidden unspokenly. This study uncovers the conflict experiences of female novice teachers in an Asian cultural context and investigates how such experiences influence their professional development and emotions.

Design/methodology/approach

The case study approach was adopted. Four participants were selected according to specific criteria, and two rounds of semi-structured interviews were conducted in five years to identify the conflicting parties, conflict types, coping strategies and resulting impact.

Findings

Longitudinal qualitative data have revealed that female novice English language teaching (ELT) teachers mainly reported conflicts with their female colleagues. Goal, task and relationship conflict are the most common types of conflict encountered, while the strategies of avoiding, dominating and obliging are the most popular. This study also discusses the impacts of such conflict experiences.

Originality/value

This study identifies the influence of culture, particularly a culture of high power distance and an emphasis on “precious harmony”, on novice female teachers' conflict coping and offers insights into how conflict can be utilised to enhance novice teachers' professional development in the school professional learning community.

Details

Journal of Professional Capital and Community, vol. 8 no. 2
Type: Research Article
ISSN: 2056-9548

Keywords

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