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Article
Publication date: 15 October 2019

Yicong Gao, Chuan He, Bing Zheng, Hao Zheng and Jianrong Tan

Complexity is the main challenge for present and future manufacturers. Assembly complexity heavily affects a product’s final quality in the fully automated assembly…

Abstract

Purpose

Complexity is the main challenge for present and future manufacturers. Assembly complexity heavily affects a product’s final quality in the fully automated assembly system. This paper aims to propose a new method to assess the complexity of modern automated assembly system at the assembly design stage with respect to the characteristics of both manufacturing system and each single component to be mounted. Aiming at validating the predictive model, a regression model is additionally presented to estimate the statistic relationship between the real assembly defect rate and predicted complexity of the fully automated assembly system.

Design/methodology/approach

The research herein extends the S. N. Samy and H. A. ElMaraghy’s model and seeks to redefine the predictive model using fuzzy evaluation against a fully automated assembly process at the assembly design stages. As the evaluation based on the deterministic scale with accurate crisp number can hardly reflect the uncertainty of the judgement, fuzzy linguistic variables are used to measure the interaction among influence factors. A dependency matrix is proposed to estimate the assembly complexity with respect to the interactions between mechanic design, electric design and process factors and main functions of assembly system. Furthermore, a complexity attributes matrix of single part is presented, to map the relationship between all individual parts to be mounted and three major factors mentioned in the dependency matrix.

Findings

The new proposed model presents a formal quantification to predict assembly complexity. It clarifies that how the attributes of assembly system and product components complicate the assembly process and in turn influence the manufacturing performance. A center bolt valve in the camshaft of continue variable valve timing is used to demonstrate the application of the developed methodology in this study.

Originality/value

This paper presents a developed method, which can be used to improve the design solution of assembly concept and optimize the process flow with the least complexity.

Details

Assembly Automation, vol. 39 no. 5
Type: Research Article
ISSN: 0144-5154

Keywords

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Article
Publication date: 2 March 2020

Yan Liang, Feng Zhao, Dong-Jin Yoo and Bing Zheng

The purpose of this paper is to describe a novel design method to construct lattice structure computational models composed of a set of unit cells including simple cubic…

Abstract

Purpose

The purpose of this paper is to describe a novel design method to construct lattice structure computational models composed of a set of unit cells including simple cubic, body-centered cubic, face-centered cubic, diamond cubic and octet cubic unit cell.

Design/methodology/approach

In this paper, the authors introduce a new implicit design algorithm based on the computation of volumetric distance field (VDF). All the geometric components including lattice core structure and outer skin are represented with VDFs in a given design domain. This enables computationally efficient design of a computational model for an arbitrarily complex lattice structure. In addition, the authors propose a hybrid method based on the VDF and parametric solid models to construct a conformal lattice structure, which is oriented in accordance with the geometric form of the exterior surface. This method enables the authors to design highly complex lattice structure, computational models, in a consistent design framework irrespective of the complexity in geometric representations without sacrificing accuracy and efficiency.

Findings

Experimental results are shown for a variety of geometries to validate the proposed design method along with illustrative several lattice structure prototypes built by additive manufacturing techniques.

Originality/value

This method enables the authors to design highly complex lattice structure, computational models, in a consistent design framework irrespective of the complexity in geometric representations without sacrificing accuracy and efficiency.

Details

Rapid Prototyping Journal, vol. 26 no. 6
Type: Research Article
ISSN: 1355-2546

Keywords

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Book part
Publication date: 30 September 2021

Tsui Sit, Erebus Wong, Kin Chi Lau and Tiejun Wen

Since the Land Revolution of 1949, China has continuously practiced collective ownership of land resources and local governance at the village and township levels. This…

Abstract

Since the Land Revolution of 1949, China has continuously practiced collective ownership of land resources and local governance at the village and township levels. This chapter argues that based on Chinese experiences, a socialist transformation is largely dependent on socialization of land resources, with the majority having access to land, food, and shelter, as well as on community organization of livelihood. This is not only the legacy of land revolution but also the foundation of Chinese society, which acts as social stabilizer. China in the past 70 years has completed primitive capital accumulation and proceeded to industrial expansion and financial adjustments. Rural China has played an important role in absorbing the shocks of cyclical economic crises induced by external and domestic factors. China adopts policies of land distribution in favor of the small peasantry and promises to defend the agrarian sector – comprising three irreducible dimensions: peasants, rural society, and agriculture, together known as Sannong, as well as the current policy of rural vitalization – against the background of macroeconomic crises, particularly amid the current economic downturn and health crises, that is, United States–China trade war, the crisis of globalization, New Cold War, and the COVID-19 pandemic. The experiences of Zhoujiazhuang Commune and Puhan Rural Community will be provided as examples to show that the bedrock of maintaining socialist transformation is the resilience of small peasantry and rural communities.

Details

Imperialism and Transitions to Socialism
Type: Book
ISBN: 978-1-80043-705-0

Keywords

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Article
Publication date: 1 April 2004

Jim Smith, Bing Zheng, Peter E.D. Love and David J. Edwards

Argues that the Chinese construction industry faces a daunting challenge as it slowly migrates from a planned to a market oriented economic system, particularly, with the…

Abstract

Argues that the Chinese construction industry faces a daunting challenge as it slowly migrates from a planned to a market oriented economic system, particularly, with the issue of selecting the most appropriate procurement path. One of the fundamental barriers to knowledge transfer is the historically insular nature of the Chinese Government. To overcome this, a questionnaire survey was undertaken to identify the factors influencing the choice of procurement methods adopted in the Guangdong Province. Results show that quality, risk, dispute, arbitration and price certainty were the most important discriminating factors. The traditional procurement methods are regarded as the most suitable approaches for the Guangdong Province.

Details

Facilities, vol. 22 no. 5/6
Type: Research Article
ISSN: 0263-2772

Keywords

Content available
Article
Publication date: 17 August 2012

Abstract

Details

Grey Systems: Theory and Application, vol. 2 no. 2
Type: Research Article
ISSN: 2043-9377

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Article
Publication date: 26 March 2021

Bing Hua, Nan Zhang and Mohong Zheng

Taking into account the factors of torque saturation and angular velocity limitation during the actual attitude maneuver of the satellite, as well as the difficulty of…

Abstract

Purpose

Taking into account the factors of torque saturation and angular velocity limitation during the actual attitude maneuver of the satellite, as well as the difficulty of parameter selection in the design of attitude control algorithm, the purpose of this paper is to propose a satellite magnetic/momentum wheel attitude control technology based on pigeon-inspired optimization (PIO) cascade-saturation control law optimization.

Design/methodology/approach

The optimal parameters are calculated through the PIO algorithm and then the parameters are used in the cascade-saturation control law to control the actuator findings-mathematical simulation results show that the cascade-saturation control law optimization algorithm based on PIO can shorten the adjustment time and reduce the steady-state error.

Findings

Compared with traditional attitude maneuver control with given parameters, the PIO algorithm can accurately calculate the optimal parameters needed to achieve the control objective and this method has better stability and higher accuracy.

Originality/value

The innovative PIO algorithm is used to calculate the optimal parameters, and the cascade saturation control law is used to control the actuator. Compared with the traditional algorithm, the regulation time is shortened and the steady-state error is reduced.

Details

World Journal of Engineering, vol. 18 no. 4
Type: Research Article
ISSN: 1708-5284

Keywords

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Article
Publication date: 3 May 2016

Shan Li, Li Juan Zheng, Cheng Yong Wang, Bing Miao Liao and Lianyu Fu

In an integrated circuit (IC) substrate, more fillers, including talcum powder and aluminium hydroxide, are added, which leads to much higher rigidity and hardness…

Abstract

Purpose

In an integrated circuit (IC) substrate, more fillers, including talcum powder and aluminium hydroxide, are added, which leads to much higher rigidity and hardness compared with a traditional printed circuit board. However, the micro drilling of IC substrates is harder. This paper aims to test the drilling process of IC substrates to improve the drilling process and the micro hole quality.

Design/methodology/approach

Substrate drilling by a micro drill with 0.11-mm diameter was used under several drilling conditions. The influence of drilling conditions on the drilling process was observed. Drilling forces, drill wear and micro hole quality were also studied.

Findings

The deformation circle around holes, hole location accuracy, bugle hole and burrs were the major defects of micro holes that were observed during the drilling of the substrate. Reducing the drilling force and drill wear was the effective way to improve hole quality.

Originality/value

The technology and manufacturing of IC substrates has been little investigated. Research data on drilling IC substrates is lacking. The micro hole quality directly affects the reliability of IC substrates. Thus, improving the drilling technology of IC substrates is very important.

Details

Circuit World, vol. 42 no. 2
Type: Research Article
ISSN: 0305-6120

Keywords

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Article
Publication date: 10 April 2009

Xiandong Tan, Zhaoguang Hu, Baoguo Shan and Meng Li

The purpose of this paper is to establish a model to analyze the impacts of economic policy on the demand for electricity in China, including the impacts of fiscal and…

Abstract

Purpose

The purpose of this paper is to establish a model to analyze the impacts of economic policy on the demand for electricity in China, including the impacts of fiscal and monetary policies.

Design/methodology/approach

With the development of electric reform, the impacts of economic policy on demand for electricity will be more and more obvious. It is difficult to analyze the impacts by a conventional model. CGE model is based on the theory of general equilibrium which is put forward by Walras, it describes the supplying and demanding relationship between the sectors of the economic system, a CGE model can recognize that an exogenous change (in policy or from other source) that affects any one part of the economy can produce repercussions throughout the system, it can also analyze the impacts of economic policy on electric power sector.

Findings

A CGE model and a social accounting matrix are established.

Research limitations/implications

Accessibility and availability of data are the main limitations which model will be applied.

Practical implications

A very useful model to study the impacts of economic policy on electric power sector.

Originality/value

The new method to analyze the impacts of economic policy on electric power sector in China. The paper aims at policy makers and the researchers who deal with electric power demand and supply.

Details

Kybernetes, vol. 38 no. 3/4
Type: Research Article
ISSN: 0368-492X

Keywords

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Article
Publication date: 6 June 2016

Ying Zheng, Daying Yan and Bing Ren

This paper aims to propose an integrated framework combining the cost-reduction rationale and the institution-leveraging rationale to explain how institutional distance…

Abstract

Purpose

This paper aims to propose an integrated framework combining the cost-reduction rationale and the institution-leveraging rationale to explain how institutional distance, both formal and informal, influences emerging multinational enterprises (EMNEs)’ foreign direct investment (FDI) location choice. This paper also explores the moderating role of EMNEs’ FDI experience and strategic intent on value chain positioning as a reflection of firm heterogeneities, on the link between institutional distance and location choice.

Design/methodology/approach

This paper tests the hypotheses based on a firm-level longitudinal data set of FDI by Chinese EMNEs. The unique data are manually collected from Chinese companies listed on Shenzhen and Shanghai Stock Exchanges, composed of 250 FDI entries of 122 manufacturing firms from 2006 to 2010. The conditional logit model is used to estimate the proposed main effect and moderating effect.

Findings

Cultural distance does not deter Chinese EMNEs’ entrance in general, but firms investing in low value-added manufacturing subsidiaries are more likely to choose culturally similar countries than those investing in high value-added subsidiaries such as in upstream R&D and downstream marketing. Formal institutional distance with positive direction promotes Chinese EMNEs’ entrance, and this effect is enhanced when firms have less FDI experience and have the strategic intent to invest in high value-added subsidiaries.

Originality/value

This paper contributes to the current literature by identifying a holistic view of the institutional influences on FDI location choice of EMNEs and revealing how firm-level heterogeneities, particularly FDI experience and strategic intent of subsidiary value chain positioning, shape the boundary conditions of the institutional effects in different ways.

Details

Nankai Business Review International, vol. 7 no. 2
Type: Research Article
ISSN: 2040-8749

Keywords

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Article
Publication date: 1 October 2018

Fangwei Xie, Xinjian Guo, Diancheng Wu, Bing Zhang, Xudong Zheng, Dengshuai Wang and Yun Wang

In this paper, a kind of an oil groove structure which could improve the transmission torque of an oil film was designed, i.e. the width and depth of oil groove gradually…

Abstract

Purpose

In this paper, a kind of an oil groove structure which could improve the transmission torque of an oil film was designed, i.e. the width and depth of oil groove gradually decrease with the increase in the radius.

Design/methodology/approach

Effects of the structural parameters of the oil groove on the hydro-viscous drive (HVD) characteristics with variable rotational speed were investigated by means of numerical calculation.

Findings

Research results show that with the decrease of the width and depth of the oil groove at the outer diameter, transmission torque increases, while the temperature is almost unchanged. Keeping the effective area unchanged, comparing the transmitted torque under the oil groove angle θ2 = 0.5° and θ2 = 4.5°, the former was almost 200 per cent of the latter; the torque transmitted with h2 = 0.05 mm was almost 150 per cent of that with h2 = 0.2 mm.

Originality/value

In this paper, the authors analyze the friction surface of the friction plate between the oil groove, oil distribution and oil film transfer torque from the oil groove structure parameters and found methods to improve the transmission torque. For the first time, the influence of the structural parameters of oil groove on the characteristics of HVD was studied under the condition of variable rotational speed, and a better method to improve the transmission torque was proposed.

Details

Industrial Lubrication and Tribology, vol. 70 no. 9
Type: Research Article
ISSN: 0036-8792

Keywords

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