Meng Dawei, Wen Jiabin and Lu Yongping
Some improvements are made for Fast Boundary Tracking algorithm according to the practice of the electric machine design in the paper. As discrete variables play a dominant role…
Abstract
Some improvements are made for Fast Boundary Tracking algorithm according to the practice of the electric machine design in the paper. As discrete variables play a dominant role in determining the values of the objective function and the constraint functions in the motor optimal design, the algorithm is improved in the paper. From the algorithm, a software is developed and used for the optimal design of the induction motors of Y series. The results show that the algorithm is reliable and efficient.
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Yong Li and Yongping Lu
A tentative idea of introducing rotating electromagnetic force for dynamic balancing is presented in the paper. A method of generating the force is put forward, the force…
Abstract
A tentative idea of introducing rotating electromagnetic force for dynamic balancing is presented in the paper. A method of generating the force is put forward, the force generated has adjustable magnitude, speed and phase angle. Working characteristics of the force are analyzed. Phase windings fed with half sine currents are designed to restrain pulsation of the force vector in space. Simulation results of a model indicate that a rotating force vector can be obtained by selecting a proper number of phases simultaneously fed with currents, which is able to meet the needs of ordinary engineering problems.
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Chen Yongbin, Yang Junyou, Yu Hainian and Tang Renyuan
Boundary element method(BEM) is applied to computation of 3D eddy current fields due to heavy current leads in a 360MVA/500kV power transformer. To improve numerical accuracy…
Abstract
Boundary element method(BEM) is applied to computation of 3D eddy current fields due to heavy current leads in a 360MVA/500kV power transformer. To improve numerical accuracy, triangle polar coodinate mapping and addition‐substraction technique are chosen to evaluate singular integrals. The effects of different shields in cover and arrangements of heavy current leads on eddy current loss and its density are analyzed.
The purpose of this paper was to assess and determine the impact of the five core technologies of Industry 4.0 (3D Printing, Big Data Analytics, Cloud Computing, Internet of…
Abstract
Purpose
The purpose of this paper was to assess and determine the impact of the five core technologies of Industry 4.0 (3D Printing, Big Data Analytics, Cloud Computing, Internet of Things (IoT) and Robotics) on the organizational performance of the retail industry in the context of Pakistan.
Design/methodology/approach
Pakistan's retail industry was chosen as the target sector, and the target population was composed of senior-level employees, including managers from first-level positions to top-level positions, as well as subordinate employees working under the supervision of first-level managers, possessing the technological know-how of Industry 4.0. The data were collected through a matrix-based survey questionnaire that was based on a five-point Likert scale, ranging from “strongly agree” to “strongly disagree.” The process of data analysis was conducted using IBM SPSS Statistics.
Findings
The findings obtained by this research work showed a significant relationship among the five core pillars of Industry 4.0 and the organizational performance of Pakistan's retail industry. Besides, the obtained findings provided preliminary evidence that Industry 4.0's disruptive technologies, particularly, 3D printing, big data analytics, cloud computing, IoT and robotics, could help Pakistan's retail industry solve various problems and challenges, such as meager revenues, increased expenses and unorganized systems.
Originality/value
The present study extended the theoretical body of knowledge through studying and examining Industry 4.0's five crucial factors that significantly contribute to the service sector, particularly, the retail industry, of the big emerging markets (BEM) economies, including Pakistan.
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Purpose – This chapter explores ways in which urban women in China balance work and family demands, as the state's protective and welfare functions in post-Mao reform are…
Abstract
Purpose – This chapter explores ways in which urban women in China balance work and family demands, as the state's protective and welfare functions in post-Mao reform are increasingly being replaced by market forces, and the chapter examines how urban women's enactment of work and family roles are shaped by changing workplaces as well as by their personal and family circumstances. The purpose is to understand the impact of marketization on gender configuration through the lens of the work-family nexus.
Research design – Data come from in-depth interviews conducted between 2005 and 2007 with 115 married women in four large cities. For analytical purposes, the informants were divided into three groups: stay-at-home moms, family-orientated working women, and work/career-oriented women.
Findings – Although market reform may create opportunities for some women to enhance their personal lives, as a consequence of workers' loss of the safety net and welfare benefits, the neglect of women's reproductive work, and the commercialization of child care and child education, it has generated, for many women, much role conflict between work and family. Work/career-oriented women are able to actively engage in market activities precisely because they are protected still by the state, can afford commercial services of domestic tasks, or have strong support from their extended families.
Originality/value – Women's varying role orientations reflect more their strategies of coping with structural changes than their mere adherence to certain gender ideologies.
Social implications – The chapter calls for curbing unbridled market forces and restoring public services so as to create a family/women-friendly work and social environment.
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Song Quan, Yong Guo, Xuedong Liu, Zhewu Chen and Yudi Liu
This paper aims to study the lubrication and sealing performance on the textured piston pair under the cross action of the shape and structure parameters. This paper further…
Abstract
Purpose
This paper aims to study the lubrication and sealing performance on the textured piston pair under the cross action of the shape and structure parameters. This paper further carries out the optimization design of low energy consumption hydraulic impact piston pair.
Design/methodology/approach
Based on the characteristics of the ring gap seal piston pair, the flow field analysis model of the whole film gap is established for its periodic treatment. The friction power loss of the piston pair is defined as the evaluation index of the lubrication performance and the leakage power loss as the evaluation index of the sealing performance. The orthogonal test design and CFD software were used to analyze the lubrication and sealing performance of the textured piston pair.
Findings
The cross action of shape and structure factors has a great influence of the lubrication and sealing performance on the textured piston pair. Clearance and shape parameters have great influence on it, while seal length and depth diameter ratio have little influence. The sealing performance of conical textured piston pair is good, while the lubrication performance of square textured piston pair is good. The primary and secondary order of influence of shape and structure on energy consumption on piston pair is B (seal clearance) > C (texture shape) > D (area ratio) > A (seal length) > E (depth diameter ratio).
Originality/value
Breaking the defect of local optimization design on traditional piston pair structure, then find the matching relationship of structural parameters on textured piston pair. Further improve the lubrication and sealing performance of the piston pair, and provide reference for the global optimization design of the low energy consumption hydraulic impact piston pair.