Shuwen Wang, Feiyan Yan and Ao Chen
The purpose of this paper is to investigate the tribological effects of laser surface texturing (LST) and residual stress on functional surfaces.
Abstract
Purpose
The purpose of this paper is to investigate the tribological effects of laser surface texturing (LST) and residual stress on functional surfaces.
Design/methodology/approach
Three different surface textures (circular dimple, elliptical dimple and groove) with two different textured area ratios (10 and 20 per cent) are designed and fabricated by a Picosecond Nd YAG Laser machine. The friction and wear performance of textured specimens is tested using a UMT-2 friction and wear testing machine in mixed lubrication.
Findings
Test results show that elliptical dimples exhibit the best performance in wear resistance, circular dimples in friction reduction and grooves in stabilization of friction. The surfaces with larger textured area density exhibit better performance in both friction reduction and wear resistance. The improved performance of LST is the coupled effect of surface texture and residual stress.
Originality/value
The findings of this study may provide guidance for optimal design of functional surface textures in reciprocating sliding contacts under mixed or hydrodynamic lubrication, which can be used in automotive and other industrial applications.
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Chunxing Gu, Li Dai, Di Zhang and Shuwen Wang
This paper aims to study the startup performance of thrust bearing. The effects of acceleration scenarios, roughness, the area ratio of texture and texture depth on the transient…
Abstract
Purpose
This paper aims to study the startup performance of thrust bearing. The effects of acceleration scenarios, roughness, the area ratio of texture and texture depth on the transient startup performance of the thrust bearing were analyzed.
Design/methodology/approach
The lubrication model is solved by the Reynolds equation with the mass-conservation boundary condition. The Greenwood and Tripp contact model is used to predict asperity contact load. The finite volume method is used to discretize the governing equations.
Findings
By studying the bearing performance with different acceleration functions, it was found that the higher the acceleration at the beginning of the startup, the faster the thrust bearing operates under the hydrodynamic lubrication regime in the start stage. It appears that the friction and contact time of asperity increase with the increasing roughness. The optimal area ratio of texture is within 30%–50%. The depth of texture ranging from 1 to 2 is the best.
Originality/value
This paper proposes a transient mixed lubrication analysis model of the thrust bearing. This model can be used to analyze the variations of tribological performance and lubrication regime of the thrust bearing under different acceleration scenarios.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-09-2022-0268/
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Surface coatings have been introduced on the contact surfaces to protect the mechanical parts for a long time. However, in terms of the optimum design of coatings, some key…
Abstract
Purpose
Surface coatings have been introduced on the contact surfaces to protect the mechanical parts for a long time. However, in terms of the optimum design of coatings, some key coating parameters are still selected by trial and error. The optimum design of coatings can be conducted by numerical experiments. This paper aims to predict the contact behavior of the coated rough surfaces accurately. One improved asperity contact model for the coated rough surfaces considering the misalignment of asperities would be developed.
Design/methodology/approach
Incorporating the coated asperity contact model into the improved Greenwood Tripp-based statistical approach, the proposed model can predict the elastic-plastic behaviors of the interacting coated asperities.
Findings
According to numerical experiments, compared with the coated asperity contact model in which an equivalent rough surface against a plane is assumed, the improved asperity contact model for the coated contacts can account for the effect of permitting misalignment of two rough surfaces. The contacts having the thicker, stiffer and harder coatings result in higher asperity contact pressure and smaller real contact area fraction under the given Stribeck oil film ratio.
Originality/value
In this paper, one statistical coated asperity contact model for two rough surfaces was developed. The developed model can consider the elastic-plastic behavior of interacting coated asperities. The effects of the coating thickness and its mechanical properties on the contact behavior of the rough surfaces with coatings can be evaluated based on the developed model.
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Fang‐Ming Hsu, Tser‐Yieth Chen and Shuwen Wang
The purpose of this paper is to investigate the efficiency and satisfaction of electronic records management systems (ERMS), which has been of interest to archivists and records…
Abstract
Purpose
The purpose of this paper is to investigate the efficiency and satisfaction of electronic records management systems (ERMS), which has been of interest to archivists and records managers, in electronic government (e‐government) agencies in Taiwan.
Design/methodology/approach
Using the measures from information systems (ISs) success model, this study applies data envelopment analysis to measure the relative efficiency and satisfaction in different types of e‐government agencies. After conducting a large‐scale survey of e‐government agencies in Taiwan, a matrix of efficiency and satisfaction is developed.
Findings
Research results show that the efficiency of ERMS in central agencies exceeds that in local agencies, and the efficiency in upper level agencies exceeds that in lower level agencies. The efficiency in business agencies exceeds that in administration agencies and public schools. Additionally, ERMS user's satisfaction in e‐government agencies is linearly related to ERMS efficiency.
Research limitations/implications
Owing to the budget limits, only a one‐shot survey is conducted, thus the comparison between ex‐ante and ex‐post measurement could not be performed.
Practical implications
The business‐related reasons are more critical in implementing ERMS than the compliance‐related ones.
Originality/value
This paper proposes a mathematical modeling tool for assessing ISs in e‐government.
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Shuwen Guo, Junwu Wang and Huaping Xiong
Construction projects have become increasingly long, complex and costly with waste and inefficiencies and often fail to achieve the desired results. Integrated project delivery…
Abstract
Purpose
Construction projects have become increasingly long, complex and costly with waste and inefficiencies and often fail to achieve the desired results. Integrated project delivery (IPD) is believed to change these problems. A reasonable and fair profit distribution mechanism is a critical factor for ensuring the success of the IPD projects. This study aims to investigate the strategies of all participants in the profit distribution of an IPD project with respect to the factor of the effort level.
Design/methodology/approach
This study describes the influence of owners and participants on profit distribution due to their respective efforts in the IPD project alliance. The influence of effort level on profit distribution is discussed based on the Holmstrom-Milgrom model of asymmetric information game theory and principal-agent theory, combined with incentive compatibility (IC) constraints and individual rationality (IR) constraints.
Findings
The results show that the optimal level of effort by each participant optimizes the profit distribution of an IPD project. At the same time, in the revenue incentive contract, the effort level of the participants is positively correlated with the profit distribution, proportional to their contribution coefficient and inversely proportional to the square of the cost of their creative activities in terms of effort. Each party of an IPD project can adopt a series of measures to improve their own effort level and choose the optimal level of effort based on the profit distribution, while satisfying their own utility maximization.
Originality/value
This study introduces the Holmstrom-Milgrom model in the principal-agent theory to explore the influence of the effort level on profit distribution in IPD projects. The quantitative model can contribute to establish a fair and efficient profit distribution scheme for the IPD projects.
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Shuwen Sun, Chenyu Song, Bo Wang and Haiming Huang
The safety performance of cooperative robots is particularly important. This paper aims to study collision detection and response of cooperative robots, which meet the lightweight…
Abstract
Purpose
The safety performance of cooperative robots is particularly important. This paper aims to study collision detection and response of cooperative robots, which meet the lightweight requirements of cooperative robots and help to ensure the safety of humans and robots.
Design/methodology/approach
This paper proposes a collision detection, recognition and response method based on dynamic models. First, this paper identifies the dynamic model of the robot. Second, an external torque observer is established based on the model, and a dynamic threshold collision detection method is designed to reduce the interference of model uncertainty on collision detection. Finally, a collision position and direction estimation method is designed, and a robot collision response strategy is proposed to reduce the harm caused by collisions to humans.
Findings
Comparative experiments are conducted on static threshold and dynamic threshold collision detection, and the results showed that the static threshold only detected one collision while the dynamic threshold could detect all collisions. Conducting collision position and direction estimation and collision response experiments, and the results show that this method can determine the location and direction of collision occurrence, and enable the robot to achieve collision separation.
Originality/value
This paper designs a dynamic threshold collision detection method that does not require external sensors. Compared with static threshold collision detection methods, this method can significantly improve the sensitivity of collision detection. This paper also proposes a collision position direction estimation method and collision separation response strategy, which can enable robots to achieve post collision separation and improve the safety of cooperative robots.
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Shuwen Guo, Junwu Wang and Han Wu
This paper examines the profit distribution of engineering projects in the integrated project delivery (IPD) mode. IPD is a new delivery method that can ameliorate many of the…
Abstract
Purpose
This paper examines the profit distribution of engineering projects in the integrated project delivery (IPD) mode. IPD is a new delivery method that can ameliorate many of the disadvantages of traditional delivery methods and improve project results. In the implementation of IPD, the profit distribution is key for ensuring the success of IPD projects.
Design/methodology/approach
This paper described a new method for characterizing profit distribution in the IPD mode. The payment function and Shapley value of the cooperative fuzzy game of fuzzy alliance were defined by considering the Choquet integral of the fuzzy measure. The participation of each player was considered, and the influence of participation on the profit distribution was discussed. Lastly, changes in the profit distribution of core participants under different alliance combinations were studied.
Findings
A case from a report of The American Institute of Architects (AIA) was used to verify the fuzzy alliance model. There was a significant correlation between the degree of participation of the owner, architect and builder and the profit distribution among these three participants.
Research limitations/implications
The theoretical research in this paper has some limitations. Initially, this paper selects a case with only three key participants in order to simplify the research. When there are many core participants, how to establish the alliance in the IPD mode and how to establish the corresponding profit distribution model, further work is certainly required to disentangle these complexities in models. Second, in this case, BIM technology has little impact on the income of the whole project. Therefore, this paper does not consider the impact of BIM technology on the marginal effect of the IPD project. Third, the contract type in the case is a custom tri-party based on IFOA. There is no classified discussion of the impact of different contracts on the profit distribute in the paper.
Practical implications
Based on the in-depth study of cooperative game with alliance structure, this paper promotes the classic cooperative game with alliance structure. The authors define the payoff function of fuzzy cooperative games by Choquet integral of fuzzy measure, and introduce the idea into the field of IPD. It aims at extending the solution to a cooperative game without a core. It can be obtained through a simple calculation. In the IPD alliance, the fuzziness and uncertainty of the participation degree of each participant will affect the profit of the whole project. The authors find that the higher the participation rate of players, the more profit each participant has. The greater the influence weight of the designer on the alliance, the lower the influence weight of the contractor on the alliance, the lower the participation of the contractor and the designer, and the lower the income distribution value of the three core participants. It shows a monotonous decline status.
Social implications
For any construction enterprise, it can make more profits if it joins the grand alliance. In the IPD alliance, each participant can maximize their own interests, which can also promote the enthusiasm of construction enterprises to participate in the alliance and increase the application of IPD mode in AEC industry. This research method provides a new fast, effective, and more realistic solution method for cooperative countermeasures. It can be further extended to other cooperative game fields and advance a new research perspective and solution for the distribution of cooperative interests.
Originality/value
The contribution of this paper is the development of a fuzzy alliance model that provides a tool for measuring the profit distribution in IPD. This is the first quantitative model to connect the degree of participation with the profit distribution in IPD using fuzzy alliance.
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Ruiqian Jia, Wenan Hu and Shuwen LI
The purpose of this study is to examine the potential process through which leadership exerts impacts on organizational innovation. A thorough analysis was conducted by…
Abstract
Purpose
The purpose of this study is to examine the potential process through which leadership exerts impacts on organizational innovation. A thorough analysis was conducted by highlighting the contribution of ambidextrous leadership to organizational innovation.
Design/methodology/approach
Data were collected from companies located in mainland China. A total of 200 cases were included in the final sample. Hierarchical regression analysis was adopted to test the hypotheses in this study.
Findings
The results showed that exploitation knowledge search and exploration knowledge search partly mediated the relationship between ambidextrous leadership and organizational innovation, respectively. Strategic flexibility could positively moderate the relationship between exploitation knowledge search and organizational innovation and had no significant impacts on moderating the relationship between exploration knowledge search and organizational innovation.
Research limitations/implications
In this study, not only were managers provided with a sophisticated understanding of how and when ambidextrous leadership could influence organizational innovation but also concrete strategies were given for enhancing organizational innovation.
Originality/value
In this study, the interaction among ambidextrous leadership, knowledge search and organizational innovation were elucidated and the moderating impacts of strategic flexibility on the relationship between knowledge search and organizational innovation were explored. The findings of this study enriched the literature on leadership, knowledge management and innovation.
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Shuwen Li, Ruiqian Jia, Juergen H. Seufert, Huijie Tang and Jinlian Luo
The purpose of this study is to explore how and when ethical leadership enhances bootlegging. To achieve this purpose, the authors proposed a moderated dual-path model in this…
Abstract
Purpose
The purpose of this study is to explore how and when ethical leadership enhances bootlegging. To achieve this purpose, the authors proposed a moderated dual-path model in this study.
Design/methodology/approach
The model was tested on two related studies. Study 1 was based on three-wave, collected data from a sample of 511 employees of Chinese companies. Data used in Study 2 was collected by survey from employees and their direct leaders of multiple departments of companies in China.
Findings
In Study 1, the authors found that moral efficacy and moral identity mediate between ethical leadership and bootlegging. Findings from Study 2 provide convergent support of moral efficacy’s and moral identity’s impact on the mediation relationship between ethical leadership and bootlegging. Moreover, the results of Study 2 further reveal that the relationship between ethical leadership and moral efficacy (or moral identity) was more significant among leader–follower with different genders.
Originality/value
This study not only enriches the literature on ethical leadership and gender (dis)similarity, but also helps managers to better understand the function of bootlegging.