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Article
Publication date: 1 July 2024

Ruipan Lu, Zhangqi Liu, Xiping Liu, Baoyu Sun and Jiangwei Liang

To address the issues of the insufficient output torque associated with the application of intensifying-flux permanent magnet (PM) machines in electric vehicles, this paper aims…

83

Abstract

Purpose

To address the issues of the insufficient output torque associated with the application of intensifying-flux permanent magnet (PM) machines in electric vehicles, this paper aims to propose an intensifying-flux hybrid excitation PM machine. It is possible to adjust the air gap magnetic field by adjusting the field current in the excitation winding, thereby increasing the torque output capability and speed range of the machine.

Design/methodology/approach

First, a novel intensifying-flux hybrid excited permanent magnet synchronous machine (IF-HEPMSM) is proposed on the basis of intensifying-flux permanent magnet synchronous machine (IF-PMSM) and an equivalent magnetic circuit model is established. Second, the tooth width and yoke thickness of the machine stator are optimized to ensure the overload capacity of the machine while effectively improving the wide flux regulation range. Furthermore, the electromagnetic characteristics of the IF-HEPMSM are investigated and compared with the IF-PMSM and conventional permanent magnet synchronous machine (PMSM) by using finite element simulations.

Findings

The id of IF-HEPMSM and IF-PMSM is greater than zero low-speed magnetizing current. And the flux-weakening current of the IF-HEPMSM is 18% and 3% smaller than of the conventional PMSM and IF-PMSM.

Practical implications

Aiming at the problems of IF-PMSM applied to electric vehicles, this paper proposes an IF-HEPMSM. The air gap magnetic field is adjusted by controlling the current of the excitation winding to improve the reliability of the machine. Therefore, the IF-HEPMSM combines the advantages of high-power density and high efficiency of the PMSM and the controllable magnetic field of the electro-excitation machine, which is of great engineering value when applied in the field of electric vehicles.

Originality/value

The proposed IF-HEPMSM offers better flux regulation capability with electromagnetic characteristics analysis and maps of dq-axis current as compared to IF-PMSM and conventional PMSM. Moreover, the improvement of the torque can make up for the shortcomings of the insufficient torque output capability of the IF-PMSM.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. 43 no. 5
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 31 July 2024

Yan Xu, Yaqiu Liu, Xun Liu, Baoyu Wang, Lin Zhang and Zhengwen Nie

The purpose of this study is to address the welding demands within large steel structures by presenting a global spatial motion planning algorithm for a mobile manipulator. This…

87

Abstract

Purpose

The purpose of this study is to address the welding demands within large steel structures by presenting a global spatial motion planning algorithm for a mobile manipulator. This algorithm is based on an independently developed wall-climbing robot, which comprises a four-wheeled climbing mobile platform and a six-degree-of-freedom robotic manipulator, ensuring high mobility and operational flexibility.

Design/methodology/approach

A convex hull feasible domain constraint is developed for motion planning in the mobile manipulator. For extensive spatial movements, connected sequences of convex polyhedra are established between the composite robot’s initial and target states. The composite robot’s path and obstacle avoidance optimization problem are solved by constraining the control points on B-spline curves. A dynamic spatial constraint rapidlye-xploring random trees-connect (RRTC) motion planning algorithm is proposed for the manipulator, which quickly generates reference paths using spherical spatial constraints at the manipulator’s end, eliminating the need for complex nonconvex constraint modeling.

Findings

Experimental results show that the proposed motion planning algorithm achieves optimal paths that meet task constraints, significantly reducing computation times in task conditions and shortening operation times in non-task conditions.

Originality/value

The algorithm proposed in this paper holds certain application value for the realization of automated welding operations within large steel structures using mobile manipulator.

Details

Industrial Robot: the international journal of robotics research and application, vol. 52 no. 1
Type: Research Article
ISSN: 0143-991X

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Article
Publication date: 1 August 2019

Malek Alshukur and Daniil Yurchenko

The purpose of this paper is to define the relationships between the structure of multi-thread fancy yarns and the combination of the rotational speed of the hollow-spindle…

129

Abstract

Purpose

The purpose of this paper is to define the relationships between the structure of multi-thread fancy yarns and the combination of the rotational speed of the hollow-spindle spinning system and thickness and stiffness of the effect component.

Design/methodology/approach

To do so, two groups of fancy yarns were made using stiff and soft effect threads and at six different machine settings.

Findings

It was found that the stiff effect thread was suitable to make fancy yarns at low rotational speeds, while the thickness of the effect threads was more important than its stiffness at low number of wraps. Additionally, even when using the same number of wraps and the overfeed ratio, a bouclé yarn, a gimp yarn, a wavy yarn or a loop yarn may results if the thickness and stiffness of the effect thread and the rotational speed were all controlled properly.

Originality/value

This study helps fancy yarn spinners to determine the type of final fancy yarns by controlling the spinning geometry in the first spinning zone.

Details

International Journal of Clothing Science and Technology, vol. 31 no. 4
Type: Research Article
ISSN: 0955-6222

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Article
Publication date: 13 August 2018

Malek Alshukur and Daniil Yurchenko

The purpose of this paper is to define the relationships between the first spinning zone of the hollow-spindle spinning system and technological parameters of manufacturing…

111

Abstract

Purpose

The purpose of this paper is to define the relationships between the first spinning zone of the hollow-spindle spinning system and technological parameters of manufacturing multi-thread fancy yarn.

Design/methodology/approach

A simple mathematical equation was introduced to account for the effect-thread helices. The validity of this equation was tested using visual observations of the helices of the effect thread in terms of their number, width and regularity and then compared against the theoretical values.

Findings

It was found that higher overfeed ratios increased the diameter of the helices without affecting their number, while increasing the rotational speed increased their number but reduced their diameter. The effect of these changes on the fancy yarns was that higher number of helices resulted in more fancy profiles while wider helices resulted in larger fancy profiles.

Originality/value

This research offers fancy yarn manufacturers a better understanding of the manufacturing process of fancy yarn and its practical advantage is to help them in determining the type of the resultant fancy yarns by controlling the geometry of the first spinning zone.

Details

International Journal of Clothing Science and Technology, vol. 30 no. 4
Type: Research Article
ISSN: 0955-6222

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Article
Publication date: 15 August 2008

Check Teck Foo

The Romance of the Three Kingdoms (RTK) is probably the most popular classical novel in Chinese literature. Of more than 1,000 characters in this extensive, three‐volume novel…

1253

Abstract

Purpose

The Romance of the Three Kingdoms (RTK) is probably the most popular classical novel in Chinese literature. Of more than 1,000 characters in this extensive, three‐volume novel, Kong Ming in RTK is widely seen by the Chinese as the most remarkable strategist. This paper attempts to develop a cognitive schema of Kong Ming on strategy.

Design/methodology/approach

First, the paper reviews broadly the traditionally, four most popular novels within the Chinese classical literature: The Romance of the Three Kingdoms, Water Margin, Journey to the West and A Dream of the Red Mansions. After emphasizing the role of the RTK in influencing Chinese strategic thinking, the paper utilizes the methods of textual analyses in research. Focusing on a specific episode of global strategy making and taking (Chapter 38), the methodology is explained.

Findings

From textual analysis, the paper presents as its finding a schematically linear, cognitive structure of the strategy process. It also presents the central role of the “Counselor of Strategy” in Chinese strategy making process. From this research, a Kong Ming‐grounded, cognitive model of strategy process is developed. If the RTK (more than say, any MBA program) continues to influence Chinese strategy processes, then fast strategic decision making (as exemplified in our analyses) may be one of the pivotal reasons for the equally fast rise of the Chinese economy in our global economic landscape.

Originality/value

Kong Ming (or Zhuge Liang) had been hailed by the Chinese with such lofty epithets such as the “Divine Strategist”. His exploits during the declining Han dynasty and emergence of the Three Kingdoms of Wei, Shu and Wu (220‐280 CE) are still cited by the Chinese people in their daily conversations on strategy. In this paper, we draw lessons for CEOs through a Kong Ming‐grounded model for strategy.

Details

Chinese Management Studies, vol. 2 no. 3
Type: Research Article
ISSN: 1750-614X

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Article
Publication date: 5 February 2018

Qiuhong Chen, Ning Geng and Kan Zhu

The purpose of this paper is to reveal the distributional characteristics and evolutional patterns in source periodicals, topics, authors, funding, and institutes of research…

2337

Abstract

Purpose

The purpose of this paper is to reveal the distributional characteristics and evolutional patterns in source periodicals, topics, authors, funding, and institutes of research papers in Chinese Agricultural Economics so as to understand the current situations and developmental tendency of Chinese agricultural economics research over the past decade.

Design/methodology/approach

Using the citation analysis method, this paper analyzed the distributional characteristics and evolution of source periodicals, fields, authors and topics of 2,203 highly cited journal papers from the database of China National Knowledge Infrastructure (CNKI) and 189 cited journal papers from database of Social Sciences Citation Index (SSCI) in agricultural economics first-authored by Chinese scholars from 2006 to 2015.

Findings

First, over the past decade, agricultural economics research in China has seen a rapid development. Specially, 103 scholars and 42 institutes have played key roles in the development, and 12 Chinese periodicals and 3 international journals have been the most influential outlets. Second, the coverage of the topics in Chinese agricultural economics research is broad and has expanded over the past decade. The rural land issue has been the most popular topic, while the issues regarding rural institutional arrangements and industrialization in rural areas have been explored extensively. However, issues in other fields, such as agricultural markets and trade, rural labor, food safety, etc. have to be further studied. Third, the improvements of economic theory and quantitative analytic techniques, the supports from research funding, and an increase in the collaboration between Chinese scholars and those from other countries have made great contribution to the rapid development of Chinese agricultural economics research over the past decade.

Originality/value

This paper is an original work that identifies the most influential journal papers including highly cited journal papers from CNKI and cited journal papers from SSCI, using citation frequency and standard Essential Science Indicators method. This is a contribution relative to the methods used by previous studies, which did not account for frequency of citation of a paper. Moreover, this study is based on data from two databases, CNKI and SSCI, suggesting that the coverage of sample papers is broader compared to those of previous studies.

Details

China Agricultural Economic Review, vol. 10 no. 1
Type: Research Article
ISSN: 1756-137X

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Article
Publication date: 5 July 2019

Corinna Braun-Munzinger

Public policy to promote corporate social responsibility (CSR) can be a tool used by the state to promote the creation of social value by multinational enterprises (MNEs) and…

628

Abstract

Purpose

Public policy to promote corporate social responsibility (CSR) can be a tool used by the state to promote the creation of social value by multinational enterprises (MNEs) and their global suppliers. Yet, this aspect has been little explored in the literature on social value creation in international business. While there is a substantial literature on the interactions of public and private regulation of firm behaviour in the global economy, little is known about the emergence of local institutional environments aimed at creating social value from MNE activities. This paper aims to address this gap in the literature.

Design/methodology/approach

Conceptually, the paper draws on the literatures on global production networks (GPNs) and on institutional approaches to CSR to grasp the local institutional environment for social value creation in MNEs and their suppliers. Empirically, the case of China is examined based on a review of literature, policy documents and interviews. The key questions the paper seeks to address is as follows: How can the emergence of local Chinese CSR standards be explained? How does the emergence of such CSR standards fit into wider policy objectives in the context of Chinese export-oriented growth?

Findings

The paper argues that the emergence of CSR standards in China needs to be seen in the context of changing industrial policy objectives to enhance both the social and economic value of participation in GPNs. Specifically, the evolution of Chinese CSR standards corresponds to a shift from structural towards functional coupling in GPNs, associated with increased policy attention on enhancing local skills and technology. Taking the case of the textile and apparel sector as an example, the paper illustrates how the adoption of China’s first CSR management system has taken place in a context of shifting strategic coupling objectives.

Research limitations/implications

A lack of data does not allow any conclusions on the impact of the Chinese institutional environment on social value creation and economic upgrading at firm level. This question could be addressed in further research. In addition, the findings open new questions around possible synergies between local policies and MNE efforts on sustainability. Increasing cooperation between Chinese and international standard setters around CSR opens the question of whether this leads to a convergence of horizontal and vertical governance on sustainability in the apparel GPN.

Practical implications

Findings show that there may be a window of opportunity for international practitioners to seek further dialogue with Chinese actors around promoting socially and environmentally sustainable business in a global economy.

Originality/value

The paper contributes to a better understanding of changes in the institutional environment for social value creation for MNEs and their suppliers in a key emerging economy. It illustrates how institutional approaches to CSR and the GPN framework can be combined to grasp the institutional environment for social value creation in an international business context.

Details

critical perspectives on international business, vol. 16 no. 2
Type: Research Article
ISSN: 1742-2043

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Article
Publication date: 13 December 2019

Alvin Y. So and Ping Lam Ip

The purpose of this paper is to trace the changing pattern of identity politics in Hong Kong Special Administrative Region (HKSAR). It shows that in response to the massive urban…

618

Abstract

Purpose

The purpose of this paper is to trace the changing pattern of identity politics in Hong Kong Special Administrative Region (HKSAR). It shows that in response to the massive urban renewal projects in the 2000s, “civic localism” in the form of cultural preservation movement emerged to protect local community culture against the government-business hegemony. However, due to the deepening of social integration between Hong Kong and the mainland, a new “anti-mainland localism” emerged in the 2010s against the influx of mainlanders. In 2015–2016, as a result of Beijing’s active interference in Hong Kong affairs, localism is further transformed to Hong Kong “independence.”

Design/methodology/approach

This paper uses a historical methodology to trace the changing pattern of identity politics in Hong Kong after it becomes a special administrative region of China in 1997.

Findings

It shows how the interaction among the following three factors has shaped the pattern of localism in Hong Kong: macro historical-structural context, social movement dynamics and the response of Hong Kong and mainland government.

Practical implications

This paper argues that Beijing’s hardline policy toward Hong Kong localism may work in the short run to all push the pro-independence activities underground. However, unless the structural contradiction of the HKSAR is resolved, it seems likely that anti-mainland localism and Hong Kong independence sentiment and movement will come back with a vengeance at a later stage.

Originality/value

The literature tends to discuss Hong Kong localism in very general terms and fails to reveal its changing nature. This paper contributes by distinguishing three different forms of localism: civic localism in the mid-2000s, anti-mainland in the late 2000s and early 2010s, and independence after 2016. It shows how the macro historical-structural transformation, social movement dynamics and the responses of the Hong Kong SAR government and Beijing government have led to the changes of civic localism to anti-mainland localism, and finally to independence.

Details

Asian Education and Development Studies, vol. 9 no. 2
Type: Research Article
ISSN: 2046-3162

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