Multi-physics analysis of a novel circular pantograph catenary system for high-speed trains

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Song Xiao ◽  
Yuanpei Luo ◽  
Jingchi Wu ◽  
Can Zhang ◽  
Yang Rao ◽  
...  
Keyword(s):  
High Speed ◽  
Electrochemical Corrosion ◽  
Superior Performance ◽  
Technical Solution ◽  
Content Type ◽  
Continuous Contact ◽  
High Speed Trains ◽  
Catenary System ◽  
And Performance ◽  
Physics Model

Purpose In high-speed trains, the energy is supplied from a high voltage catenary to the vehicle via a pantograph catenary system (PCS). Carbon pantograph strips must maintain continuous contact with the wire to ensure safety and reliability. The contact is often confined to a particular spot, resulting in excessive wear due to mechanical and thermal damage, exacerbated by the presence of an electric arc and associated electrochemical corrosion. The effectiveness and reliability of the PCS impacts on the performance and safety of HSTs, especially under high-speed conditions. To alleviate some of these adverse effects, this paper aims to propose a configuration where a circular PCS replaces the currently used pantograph strips. Design/methodology/approach Two dynamic multi-physics models of a traditional PCS with a carbon strip and a novel PCS with a circular pantograph strip catenary system are established, and the electrical and mechanical characteristics of these two systems are compared. Moreover, a PCS experimental platform is designed to verify the validity and accuracy of the multi-physics model. Findings A novel circular pantograph system is proposed in this paper to alleviate some of the shortcomings of the traditional PCS. Comparing with a traditional PCS, the circular PCS exhibits superior performance in both electromagnetic and thermal aspects. Originality/value The paper offers a new technical solution to the PCS and develops a dedicated multi-physics model for analysis and performance prediction with the aim to improve the performance of the PCS. The new system offers numerous benefits, such as less friction heat, better heat dispersion and improved catenary-tracking performance.

An empirical investigation of buyer–supplier relationship typologies and their behavioral and performance outcomes

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jin Li ◽  
Linlin Chai ◽  
Chanchai Tangpong ◽  
Michelle Hong ◽  
Rodney D. Traub
Keyword(s):  
Performance Measures ◽  
Online Survey ◽  
Performance Outcomes ◽  
Superior Performance ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Content Type ◽  
Behavioral Dynamics ◽  
And Performance ◽  
Supplier Relationship

Purpose This study aims to examine empirically the existence of four classical and four emerging buyer–supplier relationship (BSR) types and how they differ in terms of behavioral dynamics and performance measures. Design/methodology/approach This study uses an online survey to collect data from 371 purchasing managers in the USA. Findings A cluster analysis statistically supports the existence of five of these eight BSR types, including strategic/bilateral partnership, market/discrete, supplier-led collaboration, captive supplier/buyer dominant and captive buyer/supplier dominant BSRs. Further, ANOVA tests show that these five BSRs differ in terms of behavioral outcomes and performance measures. Research limitations/implications This study is based on a cross-sectional survey so it cannot examine how these BSR types may evolve over time, and it is not suitable to examine some rare types of BSRs. In addition, this study does not consider contextual factors that may moderate the influence of BSR types on the behavioral dynamics and performance measures. Practical implications Managers should consider the potential to be able to develop and enhance a strategic/bilateral relationship with their supply chain partners, which in at least some circumstances can lead to superior performance results. Similar observations can be made with respect to supplier-led and, to a lesser degree, buyer-led collaboration. Originality/value Most existing research of the BSR types is largely a product of theoretical classifications, and there is also a lack of research of their performance implications. This study fills these gaps in the literature.

How to balance interfirm relationships? A case from high-speed railway industry

2020 ◽  
Vol 35 (11) ◽  
pp. 1785-1799 ◽  
Author(s):  
Na Zhang ◽  
Xiaopeng Deng ◽  
Bon-Gang Hwang ◽  
Yanliang Niu
Keyword(s):  
High Speed ◽  
Superior Performance ◽  
Interfirm Relationships ◽  
High Speed Railway ◽  
Content Type ◽  
Railway Industry ◽  
Interfirm Cooperation ◽  
Relationship Structures ◽  
Interfirm Competition

Purpose Balancing interfirm relationships is important for firms’ long-term superior performance. However, prior studies mainly focus on interfirm competition or interfirm cooperation separately, ignoring the balance of interfirm relationships. To bridge this gap in knowledge, this study aims to develop a framework to evaluate the balance of interfirm competition and interfirm cooperation and propose strategies to optimize a firm’s interfirm relationships. Design/methodology/approach After an in-depth literature review, a framework was developed for evaluating and optimizing the interfirm relationships. Taking the high-speed railway industry as an example, the proposed framework was implemented. Findings The results of the case confirm that the balancing of interfirm relationships can lead to more superior firm performance. Also, rather than mutual suppression, the interfirm competition and interfirm cooperation present a roughly positive relationship. Originality/value This study would contribute to the existing knowledge body by developing a framework for balancing interfirm relationships. Also, this study can aid practitioners in evaluating and optimizing their interfirm relationship structures.

Compliant Variation Analysis for High-Speed Train With Consideration of Welding Distortion

2018 ◽  
Author(s):  
Tao Liu ◽  
Yongjun Li ◽  
Baowang Li ◽  
Zhimin Li ◽  
Limin Yao ◽  
...  
Keyword(s):  
High Speed ◽  
Manufacturing Industry ◽  
Structural Deformation ◽  
Angular Distortion ◽  
Welding Distortion ◽  
Variation Analysis ◽  
Analysis Model ◽  
Variation Propagation ◽  
High Speed Trains ◽  
And Performance

An important goal of the manufacturing process is to achieve high accuracy and reliability of products. For modern equipment manufacturing industries, such as high-speed trains (HST), the assembly performance is guaranteed by the product design and manufacturing technique. Since dimensional control is much related to manufacturing quality, assembly variation analysis methods play an increasingly crucial role in advanced manufacturing industry. Nevertheless, the relationship between welding distortions and tolerance design has not been considered in most existing assembly variation analysis models, which lack of quantitative analysis between precision and performance. In this study, a compliant variation analysis methodology considering both static structural deformation and welding distortion is developed and applied to predict assembly variation of the roof of HST. Firstly, welding simulation is carried out to predict welding shrinkage and angular distortion with different welding configurations. Then, welding distortion is equivalent to dimensional variation and considered in the compliant variation analysis model with offset tolerance technique. Finally, a compliant variation simulation is carried out to investigate the variation propagation influence of welding shrinkage and distortion on the final dimension of assembly. The presented methodology provides an efficient tool for variation analysis of HST, also offers a theoretical basis and experimental support for mechanical properties of compliant assembly.

scholarly journals Active Control of Contact Force for a Pantograph-Catenary System

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Jiqiang Wang
Keyword(s):  
Active Control ◽  
Contact Force ◽  
High Speed ◽  
Large Scale ◽  
Vibration Suppression ◽  
Numerical Study ◽  
Primary Objective ◽  
Geometric Framework ◽  
High Speed Trains ◽  
Catenary System

The performance of the high speed trains depends critically on the quality of the contact in the pantograph-catenary interaction. Maintaining a constant contact force needs taking special measures and one of the methods is to utilize active control to optimize the contact force. A number of active control methods have been proposed in the past decade. However, the primary objective of these methods has been to reduce the variation of the contact force in the pantograph-catenary system, ignoring the effects of locomotive vibrations on pantograph-catenary dynamics. Motivated by the problems in active control of vibration in large scale structures, the author has developed a geometric framework specifically targeting the remote vibration suppression problem based only on local control action. It is the intention of the paper to demonstrate its potential in the active control of the pantograph-catenary interaction, aiming to minimize the variation of the contact force while simultaneously suppressing the vibration disturbance from the train. A numerical study is provided through the application to a simplified pantograph-catenary model.

scholarly journals Strategic capabilities, competitive strategy, and performance among retailers in Argentina, Peru and the United States

2011 ◽  
Vol 49 (1) ◽  
pp. 139-155 ◽  
Author(s):  
John A. Parnell
Keyword(s):  
Competitive Strategy ◽  
The United States ◽  
Retail Trade ◽  
Superior Performance ◽  
Business Strategies ◽  
Strategic Group ◽  
Content Type ◽  
The Usa ◽  
Strategic Capabilities ◽  
And Performance

PurposeThis paper aims to assess the influence of strategic capabilities on the business strategy‐performance relationship among retail businesses in Argentina, Peru, and the USA.Design/methodology/approachZahra and Covin's self‐reported scale was amended and utilized to categorize businesses along Porter's typology. Strategic capability scales were adopted from DeSarbo and associates. Self‐reporting scales to assess relative competitive and objective performance in the present study were adopted from Ramanujam and Venkatraman. A survey containing these scales was administered to 277 attendees at a retail trade show in the USA. The survey – translated into Spanish – was distributed by mail and completed by 136 retailers in Peru and 163 retailers in Argentina.FindingsLinks were assessed among strategic capabilities, generic business strategies, and performance in retail businesses in Argentina, Peru and the USA. Support was found for links between the focus strategy and both marketing and linking capabilities, between the differentiation strategy and technology capabilities, and between the cost leadership strategy and management capabilities. The low cost‐differentiation combination strategy was associated with high performance in strategic groups whose businesses possess strong management and technology capabilities. These findings highlight the importance of developing strategy‐specific capabilities as a foundation for superior performance.Research limitations/implicationsThis study relied on self‐reported assessments of competitive strategy, organizational capabilities, and performance. It utilized cluster analysis, assessed only retailers, and considered only three nations.Originality/valueExtant strategic group research highlights the link between group membership and firm performance. The present study reinforces previous research. In addition, the presence of organization‐specific strategic capabilities helps to explain why some businesses outperform others in the same strategic group.

Multinationality and performance effects: an integrated theory of new patterns of multinationality and home political influence

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
I-Fan Yen ◽  
Hsin-Mei Lin
Keyword(s):  
Multinational Enterprises ◽  
Positive Relationship ◽  
Political Influence ◽  
Superior Performance ◽  
Foreign Investments ◽  
Content Type ◽  
Performance Effect ◽  
Performance Effects ◽  
And Performance ◽  
The Relationship

Purpose This paper aims to develop an integrated perspective on the relationship between multinationality and performance in the outward foreign direct investment (OFDI) of Chinese firms. The study not only represents contrasting OFDI patterns – namely, born global-natured multiple synchronous foreign investments versus conventional internationalization process (IP)-natured steady increasing foreign investments – but also contributes to understanding the extent to which explanations of home political influence need to be rooted within the general theory of multinationality. Design/methodology/approach By testing a comprehensive panel observation of 8,635 OFDI projects from 1991-2016 in China, this study found that multinationality with the new pattern of multiple synchronous OFDIs has a superior performance effect compared with the conventional pattern of steady increasing OFDIs. Findings This study also finds a positive relationship between multinationality (international diversification and home political influence) and the performance effect with the new pattern of multiple synchronous OFDIs, as well as a partial positive relationship between multinationality and the performance effect with the conventional pattern of steady increasing OFDIs. Research limitations/implications The study extends the understanding of the performance effects of Chinese multinational enterprises, which may benefit more from the new pattern of multiple synchronous OFDIs than from the conventional pattern of steady increasing OFDIs when the home-country institution is strongly positioned. Originality/value This paper concludes that multinationality needs an integrated framework that accounts for the new pattern of OFDI and the influence of diversification and home politics, particularly for the emerging country, China.

Enhancing foreign subsidiaries' performance through relational ties, market- and nonmarket-based capabilities

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Amonrat Thoumrungroje ◽  
Supara Kapasuwan
Keyword(s):  
Firm Performance ◽  
Multinational Enterprises ◽  
Social Capital Theory ◽  
Superior Performance ◽  
Foreign Subsidiaries ◽  
Capital Theory ◽  
Content Type ◽  
Mediating Role ◽  
Path Analyses ◽  
And Performance

PurposeGiven the inconclusive findings on relational ties–performance relationships, this study approaches this phenomenon through social capital theory and resource-based view (RBV) lenses to advocate the mediating role of nonmarket- and market-based capabilities.Design/methodology/approachA survey-based research methodology was employed. A list of 1,425 foreign subsidiaries was identified from the Thailand Board of Investment (BOI) website, and key informants were contacted. A final response rate of 11.8% was achieved. All hypotheses were tested via path analyses with the bootstrapping technique.FindingsThe results indicate that the relationships between business- and government-relational ties and performance are fully mediated by market- and nonmarket-based capabilities with the latter serving as essential but inadequate preconditions for achieving superior firm performance.Practical implicationsTo mitigate the liability of foreignness and to enhance performance of foreign subsidiaries operating in volatile emerging economies such as Thailand, government and business relational ties are crucial in developing nonmarket- and market-based capabilities. The nonmarket-based capabilities entail the ability to negotiate with and influence policy makers, which in turn helps augment the development of market-based capabilities, including the ability to be highly responsive to customers' needs.Originality/valueThis research illustrates the embedded roles of nonmarket and market-based capabilities developed through complex interactions among social actors, including the multinational enterprises’ (MNEs’) subsidiaries and government and nongovernment counterparts, in attaining superior performance. The results indicate how relational ties enable MNEs’ subsidiaries to develop various capabilities, and how these capabilities are related with each other and linked to firm performance. Findings from an emerging economy undergoing recent political and economic uncertainties also provide theoretical advancements for international business studies.

Primary study of a new permanent magnet flux switching machine over straight and spanned rotor configurations

2016 ◽  
Vol 13 (5) ◽  
pp. 441-446 ◽  
Author(s):  
Mahyuzie Jenal ◽  
Erwan Sulaiman ◽  
Hassan Ali Soomro ◽  
Syed Muhammad Naufal Syed Othman
Keyword(s):  
Finite Element ◽  
Performance Analysis ◽  
Permanent Magnet ◽  
High Speed ◽  
Primary Study ◽  
Element Analysis ◽  
Fundamental Study ◽  
Content Type ◽  
Dimensional Finite Element ◽  
And Performance

Purpose The purpose of this paper is to address a fundamental study and performance analysis of a proposed 6Slots-10Poles permanent magnet flux switching machine (PMFSM) using straight rotor (StR) and 6Slots-8Poles PMFSM with spanned rotor (SpR) structure. Design/methodology/approach Design configuration of the proposed machine was developed using commercial finite element analysis package and JMAG-Designer V.14 software, which provides two-dimensional finite element solver throughout the investigation. An electromagnetic performance analysis is carried out and compared over the two proposed topologies which consist of machines no-load and under-load conditions. Findings This paper demonstrates the finding of the proposed StR structure which consist of more favorable three-phase sinusoidal feature, lower cogging torque and higher output torque. Flux density attributes reveal higher established magnetizing flux concentration in StR compared with SpR. Consequently, the StR structure requires low armature current before it may start to rotate and provides better robust construction with less material consumption and cost. Originality/value This paper describes the novel design of a new PMFSM configuration pertinent for high-speed applications.

Active Control of a High-Speed Pantograph

1997 ◽  
Vol 119 (1) ◽  
pp. 1-4 ◽  
Author(s):  
D. N. O’Connor ◽  
S. D. Eppinger ◽  
W. P. Seering ◽  
D. N. Wormley
Keyword(s):  
Dynamic Model ◽  
Active Control ◽  
Contact Force ◽  
High Speed ◽  
High Speed Train ◽  
Single Measurement ◽  
Force Variation ◽  
Catenary System ◽  
And Performance ◽  
And Control

The design and performance of an active controller for a pantograph which collects current for a high-speed train are considered. A dynamic model of the pantograph/catenary system is described and control objectives are established. A design which incorporates a frame-actuated controller and requires only a single measurement is described. Over an array of train speeds, the contact force variation with the actively controlled pantograph is 50 percent less than for the equivalent passive pantograph system.

Arc Detection and Recognition in the Pantograph-Catenary System Based on Multi-Information Fusion

2020 ◽  
Vol 2674 (10) ◽  
pp. 229-240
Author(s):  
Shize Huang ◽  
Wei Chen ◽  
Bo Sun ◽  
Ting Tao ◽  
Lingyu Yang
Keyword(s):  
Visible Light ◽  
Information Fusion ◽  
High Speed ◽  
Evidence Theory ◽  
Detection Methods ◽  
Fusion Method ◽  
Fusion Model ◽  
Threshold Method ◽  
High Speed Trains ◽  
Catenary System

The pantograph-catenary system is critical to high-speed railways. Electric arcs in the pantograph-catenary system indicate possible damages to the whole railway system, and detecting them in time has been a critical task. In this paper, a fusion method for the pantograph-catenary arc detection based on multi-type videos is proposed. First, convolutional neural network (CNN) is employed to detect arcs in visible light images, and a threshold method is applied to identify arcs in infrared images. Second, the CNN-based environment perception model is established on visible light images. It obtains the dynamical adjustment of the reliability weights for different scenarios where trains usually work. Finally, the information fusion model based on evidence theory uses those weights and integrates the detection results on visible light images and infrared results. The experimental results demonstrate the fusion method can avoid misjudgments of the two individual detection methods in certain scenarios, and perform better than each of them. This approach can adapt to the complex environments of high-speed trains.

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