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Article
Publication date: 5 January 2021

Zhengyin Huang, Gregory Harris and Nicholas Loyd

The Toyota Production System has been studied for its business success for several decades. Many companies have tried to imitate but have not achieved Toyota-like results…

Abstract

Purpose

The Toyota Production System has been studied for its business success for several decades. Many companies have tried to imitate but have not achieved Toyota-like results. Failure in the ability to replicate Toyota's supportive culture has been suggested as a cause for the lack of success. Studies on lean implementation have been conducted from external views focusing on visible indicators, but few seek the employee's perception of lean initiatives. The authors propose a Toyota Production System – Toyota Way (TPS-TW) model approach using employee perception and quantitative performance metrics.

Design/methodology/approach

This research represents an improvement of a lean assessment instrument using quantifiable performance metrics for validation and testing it in the Chinese automotive industry. A survey was developed and executed in the Chinese automotive industry with participants involved with lean implementation. Experts helped examine the content validity, and reliability analysis was used to study the structure of the assessment instrument and evaluate internal consistency. Confirmatory factor analysis and structured equation modeling were used to test the construct validity. Finally, survey results and actual performance were analyzed.

Findings

The results of this research validated the TPS-TW model and assessment instrument in the Chinese automotive industry.

Originality/value

This research validates an employee perception survey that can be utilized by organizations to understand the state of their lean implementation. The research supports the use of employee perception to reflect the reality of a lean initiative and proves the TPS-TW model is an effective theoretical framework for assessment.

Details

Journal of Manufacturing Technology Management, vol. 32 no. 4
Type: Research Article
ISSN: 1741-038X

Keywords

Article
Publication date: 30 October 2020

AmirMahdi Tahsini

The purpose of this paper is to analyze the effect of pressure fluctuations on the combustion efficiency of the hydrogen fuel injected into the supersonic oxidizing cross…

Abstract

Purpose

The purpose of this paper is to analyze the effect of pressure fluctuations on the combustion efficiency of the hydrogen fuel injected into the supersonic oxidizing cross flow. The pressure fluctuations are imposed on inlet air flow and also on the fuel flow stream. Two different situations are considered: the combustion chamber once without and again with the inlet standing oblique shock wave.

Design/methodology/approach

The pressure fluctuations are imposed on inlet air flow and also on the fuel flow stream. Two different situations are considered: the combustion chamber once without and again with the inlet standing oblique shock wave. The unsteady turbulent reacting flow solver is developed to simulate the supersonic flow field in the combustion chamber with detail chemical kinetics, to predict the time-variation of the combustion efficiency due to the imposed pressure fluctuations.

Findings

The results show that the response of the reacting flow field depends on both the frequency of fluctuations and the existence of the inlet shock wave. In addition, the inlet standing shock wave has some attenuating role, but the reacting flow shows an amplifying role on imposed oscillations which is also augmented by imposing anti-phase fluctuations on both inlet and fuel flow streams.

Originality/value

This study is performed to analyze the instabilities in the supersonic combustion which has not been considered before in this manner.

Details

Aircraft Engineering and Aerospace Technology, vol. 93 no. 1
Type: Research Article
ISSN: 1748-8842

Keywords

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