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1 – 10 of 54
Article
Publication date: 12 March 2018

Wei Sun, Xiaokai Mu, Qingchao Sun, Zhiyong Sun and Xiaobang Wang

This paper aims to comprehensively achieve the requirements of high assembly precision and low cost, a precision-cost model of assembly based on three-dimensional (3D) tolerance…

Abstract

Purpose

This paper aims to comprehensively achieve the requirements of high assembly precision and low cost, a precision-cost model of assembly based on three-dimensional (3D) tolerance is established in this paper.

Design/methodology/approach

The assembly precision is related to the tolerance of parts and the deformation of matching surfaces under load. In this paper, the small displacement torsor (SDT) theory is first utilized to analyze the manufacturing tolerances of parts and the assembly deformation deviation of matching surface. In the meanwhile, the extracting method of SDT parameters is proposed and the assembly precision calculation model based on the 3D tolerance is established. Second, an integrated optimization model based on the machining cost, assembly cost (mapping the deviation domain to the SDT domain) and quality loss cost is built. Finally, the practicability of the precision-cost model is verified by optimizing the horizontal machining center.

Findings

The assembly deviation has a great influence on cost fluctuation. By setting the optimization objective to maximize the assembly precision, the optimal total cost is CNY 72.77, decreasing by 16.83 per cent from the initial value, which meets economical requirements. Meanwhile, the upper bound of each processing tolerance is close to the maximum value of 0.01 mm, indicating that the load deformation can be offset by appropriately increasing the upper bound of the tolerance, but it is necessary to strictly restrict the manufacturing tolerances of lower parts in a reasonable range.

Originality/value

In this paper, a 3D deviation precision-cost model of assembly is established, which can describe the assembly precision more accurately and achieve a lower cost compared with the assembly precision model based on rigid parts.

Details

Assembly Automation, vol. 38 no. 4
Type: Research Article
ISSN: 0144-5154

Keywords

Article
Publication date: 1 June 2022

Yun Bai, Baozhuang Sun, Wenzhu Huangfu, Xianjin Sun, Zhiyong Liu, Cuiwei Du and Xiaogang Li

The purpose of this paper was to study the relationship between safe storage life and storage mode of hot-rolled sheet (Q235, X70) in humid environment, and a prediction model of…

Abstract

Purpose

The purpose of this paper was to study the relationship between safe storage life and storage mode of hot-rolled sheet (Q235, X70) in humid environment, and a prediction model of safe storage life under different storage modes was established.

Design/methodology/approach

The corrosion behavior of hot-rolled sheets under different storage conditions was studied with immersion experiment and morphology observation.

Findings

The results show that pitting occurs on the hot-rolled sheets in humid environment, and the corrosion behavior is strongly related with the storage mode. When they are stored separately, the number and depth of pits first increase and then decrease as the Cl concentration rises, while for the stack storage, pit depth increases with increasing Cl concentration. The safe storage time of separate storage is longer than that of stack storage. Based on this, a model of chloride ion concentration and storage life was established.

Originality/value

A storage safe life model of hot-rolled sheet in humid environment is proposed.

Details

Anti-Corrosion Methods and Materials, vol. 69 no. 5
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 5 March 2018

Huibin Sun and Zhiyong Chang

The functionality and reliability of an overhauled aero-engine is determined by all configuration changes in the overhaul process. Identifying, recording, auditing, tracking and…

Abstract

Purpose

The functionality and reliability of an overhauled aero-engine is determined by all configuration changes in the overhaul process. Identifying, recording, auditing, tracking and tracing of configuration modifications are significant and meaningful. Considering the barriers to these goals, this paper aims to put forward an approach to configuration management in the aero-engine overhaul process.

Design/methodology/approach

The overhaul configuration management model is proposed to describe an aero-engine’s configuration evolution trajectory in the overhaul process. The controlling and auditing procedures are put forward to control and audit parts’ return-to-zero statuses and overproof statuses. And some searching algorithms are also designed to enable tracking and tracing of the configuration status along the time coordinate, or get a snapshot of an aero-engine’s configuration at a certain time. The above model, procedures and algorithms have been implemented and adopted to fulfill the configuration management requirements in the aero-engine overhaul process.

Findings

The approach is effective in identifying, recording, controlling, auditing, tracking and tracing configuration changes in the overhaul process.

Practical implications

The approach’s implementation and adoption present a practical example for aero-engines’ configuration management issue in the overhaul process.

Originality/value

The work proposes an original aero-engine configuration management solution for the overhaul process and enables a reliable and accurate configuration management mode.

Details

Aircraft Engineering and Aerospace Technology, vol. 90 no. 2
Type: Research Article
ISSN: 1748-8842

Keywords

Article
Publication date: 26 July 2021

Xiaoguang Sun, Xuexu Xu, Zihan Wang and Zhiyong Liu

The purpose of this paper is to determine the corrosion fatigue behavior and mechanism of 6005A aluminum alloy and welded joint.

Abstract

Purpose

The purpose of this paper is to determine the corrosion fatigue behavior and mechanism of 6005A aluminum alloy and welded joint.

Design/methodology/approach

Electron back-scattered diffraction (EBSD) were adopted to characterize the microstructure of 6005A aluminum alloy and welded joint. Through potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and corrosion fatigue experiments, the corrosion fatigue behavior and mechanism of 6005A aluminum alloy base metal and welded joint were studied.

Findings

The results show that the corrosion fatigue crack initiation of 6005A aluminum alloy base metal and welded joint is mainly caused by the preferential anodic dissolution and hydrogen concentration in the areas with inclusions and welding defects.

Originality/value

The research is an originality study on the corrosion fatigue behavior and mechanism of 6005A aluminum alloy and welded joint.

Details

Anti-Corrosion Methods and Materials, vol. 68 no. 4
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 9 December 2020

Zhen Zhao, Zhiyong Fan, Yigang Sun and Zhexu Liu

In modern integrated modular avionics (IMA), it plays an important role to guarantee safety and reliability of the system. The safety and reliability of communication scheduling…

Abstract

Purpose

In modern integrated modular avionics (IMA), it plays an important role to guarantee safety and reliability of the system. The safety and reliability of communication scheduling plays a crucial role in this IMA platforms-based network system. To verify the safety and reliability of the communication scheduling in this network, sufficient and typical test data must be generated to input into the network, obtain and evaluate the corresponding output.

Design/methodology/approach

To generate communication scheduling data, this paper presents an iterative communication scheduling data generation algorithm for a configured network of IMA platforms. First, the algorithm generates all possible communication schedules for the first timestamp. Then, constraint is introduced to decrease the quantity of communication schedules to improve the efficiency. The communication schedules are gradually extended to the second timestamp until the final timestamp, i.e. length of communication scheduling sequence.

Findings

To verify the efficiency and feasibility of the algorithm, a model is built based on the architecture analysis and design language (AADL) by mapping the correlation time of generated communication scheduling data into task properties. Schedulability is analyzed by loading this model into AADL Inspector. The simulation result illustrates that the proposed algorithm is efficient and feasible.

Practical implications

The proposed method can provide data support for communication scheduling test for the network of IMA platforms.

Originality/value

A constraint-based iterative communication scheduling data generation algorithm is proposed for the network of IMA platforms automatically.

Details

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

Keywords

Article
Publication date: 20 February 2019

BaoZhuang Sun, Wenju Liao, Zhong Li, Zhiyong Liu and Cuiwei Du

To study the corrosion behavior of pipeline steel in coastal areas, a tidal seawater macro-cell corrosion device was built using a cycle soaking tank and a macro-cell corrosion…

Abstract

Purpose

To study the corrosion behavior of pipeline steel in coastal areas, a tidal seawater macro-cell corrosion device was built using a cycle soaking tank and a macro-cell corrosion facility to simulate the corrosion behavior of pipeline steel in a simulated coastal environment (dry and wet alternations during seawater-soil corrosion macro-cell processes).

Design/methodology/approach

The corrosion behaviors were studied via the weight loss method, electrochemical methods and morphological observations on corrosion.

Findings

The results show that during the initial stage of tidal seawater/soil macro-cell corrosion process of the X65 steel, the working electrode on the seawater side is the anode of the macro-battery. As corrosion progresses, the anode and the cathode of the macro-battery become inverted. As the area ratio and the dry – wet ratio increase, the time of anode and cathode inversion shortens. Galvanic current density decreases as the dry – wet ratio increases and increases as the area ratio increases. The corrosion process of macro-cell is affected by the reversal of anode and cathode. After the reversal of anode and cathode, the corrosion rate is mainly controlled by dry – wet alternating corrosion.

Originality/value

The corrosion behavior of a pipeline steel in a coastal environment was studied using a tidal seawater macro-cell corrosion device. The synergism effect between the tidal seawater and seawater-soil macro-cell on corrosion behavior was clarified.

Details

Anti-Corrosion Methods and Materials, vol. 66 no. 3
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 6 July 2020

Longfei Song, Zhiyong Liu, Lin Lu, Xiaogang Li, BaoZhuang Sun and Huanlin Cheng

This paper aims to analyze a failure case of a P110 tube in a CO2 flooding well.

Abstract

Purpose

This paper aims to analyze a failure case of a P110 tube in a CO2 flooding well.

Design/methodology/approach

The chemical composition, microstructure and mechanical properties of the failed P110 tubing steel were tested, and met the API Spec 5CT standard. The fractures were investigated by scanning electron microscopy and energy dispersive spectroscopy.

Findings

Fracture was induced by stress corrosion cracking (SCC) and that the stress concentration caused by the mechanical damage played an important role in the failure. The failure case is a SCC failure affected by mechanical damage and galvanic corrosion.

Originality/value

The effect of the infiltration of groundwater was studied in the failure case. The stress concentration caused by the mechanical damage played an important role in the failure.

Details

Anti-Corrosion Methods and Materials, vol. 67 no. 5
Type: Research Article
ISSN: 0003-5599

Keywords

Article
Publication date: 17 April 2023

Xiangou Zhang, Yuexing Wang, Xiangyu Sun, Zejia Deng, Yingdong Pu, Ping Zhang, Zhiyong Huang and Quanfeng Zhou

Au stud bump bonding technology is an effective means to realize heterogeneous integration of commercial chips in the 2.5D electronic packaging. The purpose of this paper is to…

Abstract

Purpose

Au stud bump bonding technology is an effective means to realize heterogeneous integration of commercial chips in the 2.5D electronic packaging. The purpose of this paper is to study the long-term reliability of the Au stud bump treated by four different high temperature storage times (200°C for 0, 100, 200 and 300 h).

Design/methodology/approach

The bonding strength and the fracture behavior are investigated by chip shear test. The experiment is further studied by microstructural characterization approaches such as scanning electron microscope, energy dispersive spectrometer and so on.

Findings

It is recognized that there were mainly three typical fracture models during the chip shear test among all the Au stud bump samples treated by high temperature storage. For solder bump before aging, the fracture occurred at the interface between the Cu pad and the Au stud bump. As the aging time increased, the fracture mainly occurred inside the Au stud bump at 200°C for 100 and 200 h. When aging time increased to 300 h, it is found that the fracture transferred to the interface between the Au stud bump and the Al Pad.

Originality/value

In addition, the bonding strength also changed with the high temperature storage time increasing. The bonding strength does not change linearly with the high temperature storage time increasing but decreases first and then increases. The investigation shows that the formation of the intermetallic compounds because of the reaction between the Au and Al atoms plays a key role on the bonding strength and fracture behavior variation.

Details

Microelectronics International, vol. 41 no. 2
Type: Research Article
ISSN: 1356-5362

Keywords

Article
Publication date: 2 August 2021

Zhiyong Li, Tingting Huo, Yuhong Shao, Qingxue Zhao and Mingmin Huo

This study aims to present a holistic synopsis of the current scientific structure of inbound tourism research and suggest further research directions.

Abstract

Purpose

This study aims to present a holistic synopsis of the current scientific structure of inbound tourism research and suggest further research directions.

Design/methodology/approach

A 30-year bibliometric analysis was conducted using the Web of Science Core Collection database through CiteSpace, covering 568 Social Sciences Citation Index articles.

Findings

This study systematically identifies the evolution of scientific structures and emerging research trends in the inbound tourism field. The findings show that: co-authorship patterns reveal a trend of international cooperation; the evolution of research themes is consistent with the development of the macro-environment and inbound tourism industry, the most recent focus being on sustainable development of destinations; varied multivariate data analysis methods dominate current empirical analysis; there exist three major research dimensions in the inbound tourism field; and unilateral political factors in destinations and bilateral linkage factors affecting inbound tourism demand have aroused research interest increasingly.

Practical implications

This study helps scholars and practitioners understand the current issues and needs of the inbound tourism industry and develops a future research agenda to promote the industry’s continuous development.

Originality/value

This study is the first attempt to provide insights into the theoretical development of inbound tourism over the past three decades from the perspective of a knowledge-based platform and further facilitate sustainable development of the industry.

目的

本篇论文旨在全面地梳理入境旅游研究的整体知识架构, 进而提出未来研究方向。

设计/方法/途径

本篇论文基于文献计量法, 运用CiteSpace对从Web of Science Core Collection数据库中检索得到的30年间568篇社会科学引文索引文献进行分析。

发现

本篇论文系统地梳理了入境旅游领域知识架构的演化和新兴研究趋势, 填补了现有研究空白。结果揭示:(1)作者协作模式展现出国际化合作趋势; (2)入境旅游领域研究主题的演化趋势与宏观环境和国际旅游的发展阶段相吻合, 并且目的地可持续发展的研究成为热点; (3)目前实证分析主要采用各种多元数据分析方法; (4)入境旅游领域的研究可以归纳为三个主要研究方向; (5)单边政治因素和国家双边联系因素对入境旅游需求的影响逐渐成为近年研究热点。

实践意义

本篇论文提出了未来研究方向, 有助于学界和业界人士掌握入境旅游产业的现状和需要, 从而推动该产业的可持续发展。

独创性

本篇论文首次从知识平台视角出发, 揭示了过去三十年间入境旅游的理论发展情况。

关键词 入境旅游, 文献计量法, 知识架构, 知识平台, 未来研究方向, CiteSpace

文章类型 :研究型论文

Propósito

El objetivo de este estudio es presentar una sinopsis holística de la actual estructura científica de la investigación turística entrante y sugerir nuevas direcciones de investigación.

Diseño/metodología/enfoque

Se condujo un análisis bibliométrico de 30 años utilizando la base de datos de recopilación de datos de la red de ciencias básicas a través de CiteSpace, que abarcó 568 artículos del Índice de Citación de Ciencias Sociales.

Resultados

Este estudio identifica sistemáticamente la evolución de estructuras científicas y las tendencias de investigación emergentes en el campo del turismo entrante. Las conclusiones muestran que: i) las pautas de coautoría han revelado una tendencia a la cooperación internacional; ii) la evolución de los temas de investigación es coherente con el desarrollo del macro-entorno y de la industria del turismo entrante, centrándose más recientemente en el desarrollo sostenible de los destinos; iii) los diversos métodos de análisis de datos multivariados predominan en el análisis empírico actual; iv) existen tres grandes dimensiones de investigación en el ámbito del turismo entrante; y v) los factores políticos unilaterales en los destinos y los factores de vinculación bilateral que afectan a la demanda turística entrante han despertado un interés cada vez mayor a la investigación.

Implicaciones prácticas

Este estudio ayuda a los académicos y los profesionales a entender problemas y necesidades actuales de la industria turística entrante y desarrollar una futura guía de investigación para fomentar el desarrollo continuo de la industria.

Originalidad/valor

Este estudio es el primer intento de proporcionar información sobre el desarrollo teórico del turismo entrante en las últimas tres décadas, desde la perspectiva de la plataforma basada en un conocimiento y facilitar aún más el desarrollo sostenible de la industria.

Palabras clave

Turismo entrante, Bibliométrica, Estructura científica, Plataforma basada en el conocimiento, Agenda de investigación futura, CiteSpace

Tipo de papel

Revisión bibliográfica

Details

Tourism Review, vol. 77 no. 1
Type: Research Article
ISSN: 1660-5373

Keywords

Article
Publication date: 13 May 2020

Zhiyong Li, Fangxuan (Sam) Li and Chris Ryan

This paper aims to present a case study investigating Chinese tourists’ perceptions of North Korea which is regarded one of the most unique tourism destinations in the world.

Abstract

Purpose

This paper aims to present a case study investigating Chinese tourists’ perceptions of North Korea which is regarded one of the most unique tourism destinations in the world.

Design/methodology/approach

This exploratory study reports findings based on semi-structured interviews with 30 Chinese tourists. This study uses the cognitive-affective model to categorise destination image proposed by respondents. Data were analysed using content analysis.

Findings

The study found that the cognitive image focusses on attributes such as the country’s unique economic/political situation, unspoiled natural environment and poor infrastructure construction. Affective components centre on the friendly relationship between China and North Korea, and a comparison between North Korea’s current situation and that of China during the period of the cultural revolution.

Research limitations/implications

Given the qualitative approach and exploratory nature, the results may not be generalised to the wider literature of the Chinese outbound market. This article’s theoretical contribution to destination image may be limited to Chinese cultural contexts. This study provides practical implications for promoting North Korea’s images to attract more Chinese visitors.

Originality/value

Cognitive-affective model, as one of the most commonly used models, was used to explore North Korea’s destination image in Chinese tourists’ eyes. In addition, this study highlights the importance of politics in influencing a country’s destination image.

目的

这篇文章探究朝鲜作为世界上最神秘的旅游目的地之一在中国游客心目中的形象。

设计/方法

这个探索性研究报告的发现是基于和30位中国游客的半开放式访谈。认知情感模型被用来概括访谈对象提出的目的地形象。内容分析用来进行数据分析。

发现

这个研究发现认知影响主要关注于国家特殊的经济、政治情况, 未受污染的自然环境和落后的基础设施建设。情感印象主要关注于中朝鲜友谊和目前的朝鲜与文化大革命时期的中国相比较。

研究缺陷

作为探索性研究, 这篇文章的发现可能没法通用于中国出境游的市场。这篇文章的理论贡献可能局限于中国文化。这篇文章也为如何宣传朝鲜作为旅游旅游目的地来吸引中国游客提出了实际建议。

原创性

认知情感模型作为最常用的模型用来探索朝鲜在中国游客心里的目的地形象。除此之外, 这个研究强调了政治作为影响目的地形象的因素。

Propósito

este documento presenta un estudio de caso que investiga las percepciones de los turistas chinos sobre Corea del Norte, considerado uno de los destinos turísticos más singulares del mundo.

Diseño/metodología/enfoque

este estudio exploratorio informa resultados basados en entrevistas semiestructuradas con 30 turistas chinos. Este estudio utiliza el modelo cognitivo-afectivo para clasificar la imagen de destino propuesta por los encuestados. Los datos se analizaron mediante análisis de contenido.

Hallazgos

el estudio encontró que la imagen cognitiva se enfoca en atributos tales como la situación económica/política única del país, el entorno natural virgen y la construcción de infraestructura deficiente. Los componentes afectivos se centran en la relación amistosa entre China y Corea del Norte, y una comparación entre la situación actual de Corea del Norte y la de China durante el período de la Revolución Cultural.

Limitaciones/implicaciones

de la investigación: dado el enfoque cualitativo y la naturaleza exploratoria, los resultados pueden no generalizarse a la literatura más amplia del mercado emisor chino. La contribución teórica de este artículo a la imagen de destino puede estar limitada a los contextos culturales chinos.Este estudio ofrece implicaciones prácticas para promover las imágenes de Corea del Norte para atraer a más visitantes chinos.

Originalidad/valor

el modelo cognitivo-afectivo como uno de los modelos más utilizados se utilizó para explorar la imagen de destino de Corea del Norte a los ojos de los turistas chinos. Además, este estudio destaca la importancia de la política para influir en la imagen de destino de un país.

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