Bingjie Xu, Shuai Ji, Chengrui Zhang, Chao Chen, Hepeng Ni and Xiaojian Wu
Trajectory tracking error of robotic manipulator has limited its applications in trajectory tracking control systems. This paper aims to improve the trajectory tracking accuracy…
Abstract
Purpose
Trajectory tracking error of robotic manipulator has limited its applications in trajectory tracking control systems. This paper aims to improve the trajectory tracking accuracy of robotic manipulator, so a linear-extended-state-observer (LESO)-based prescribed performance controller is proposed.
Design/methodology/approach
A prescribed performance function with the convergence rate, maximum overshoot and steady-state error is derived for the output error transformation, whose stability can guarantee trajectory tracking accuracy of the original robotic system. A LESO is designed to estimate and eliminate the total disturbance, which neither requires a detailed system model nor a heavy computation load. The stability of the system is proved via the Lyapunov theory.
Findings
Comparative experimental results show that the proposed controller can achieve better trajectory tracking accuracy than proportional-integral-differential control and linear active disturbance rejection control.
Originality/value
In the LESO-based prescribed performance control (PPC), the LESO was incorporated into the PPC design, it solved the problem of stabilizing the complex transformed system and avoided the costly offline identification of dynamic model and estimated and eliminated the total disturbance in real-time with light computational burden. LESO-based PPC further improved control accuracy on the basis of linear-active-disturbance-rejection-control. The new proposed method can reduce the trajectory tracking error of the robotic manipulators effectively on the basis of simplicity and stability.
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Crisis communication is an essential component of crisis management in hospitality and tourism. Yet few studies have offered a clear impression of the state of knowledge in this…
Abstract
Purpose
Crisis communication is an essential component of crisis management in hospitality and tourism. Yet few studies have offered a clear impression of the state of knowledge in this area. As one of the early conceptual attempts, this study aims to contribute to the existing knowledge by analyzing, comparing and synthesizing the literature in crisis communication and hospitality and tourism research. This study also proposes a transactional and dynamic crisis communication model that lays the conceptual foundation for future research.
Design/methodology/approach
This study was guided by a theory synthesis approach and analyzed the related literature. More specifically, this study conducted a rapid review of the general crisis communication research and a conventional, systematic review of crisis communication research in hospitality and tourism. Based on the review findings, this study further develops a transactive and dynamic crisis communication model in hospitality and tourism, which is fundamental for future studies in this area.
Findings
The findings of this study are presented through a literature review of general crisis communication research and crisis communication research in hospitality and tourism and the development of a transactive and dynamic crisis communication model in hospitality and tourism.
Research limitations/implications
This study reviews the literature and develops an integrated model for crisis communication in hospitality and tourism. The findings of this study lay the conceptual foundation for crisis communication in hospitality and tourism and reveal future research venues.
Practical implications
By offering a state-of-the-art review and developing an integrated conceptual model, the findings of this study can help bridge the gaps between academics and practices as well as serve as references for practitioners to identify and develop effective crisis responses.
Originality/value
This paper represents an early effort to review crisis communication research in hospitality and tourism and conceptualize the subject area through an integrated model. The findings of this study contribute to the further conceptual development of crisis communication in hospitality and tourism.
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Dan Jin and Bingjie Liu-Lastres
This paper aims to provide a critical reflection on the impact of the gig economy on the hospitality workforce. The impact of the gig economy on hospitality workforce management…
Abstract
Purpose
This paper aims to provide a critical reflection on the impact of the gig economy on the hospitality workforce. The impact of the gig economy on hospitality workforce management is explored, with the paper delving into both theoretical insights and practical implications.
Design/methodology/approach
This paper offers reflections on the emerging trend of the gig economy and its impacts on the hospitality workforce, based on evidence collected from the selected literature, industry report and authors’ personal reflections. A micro-meso-macro analytical framework was also applied to assist authors in building the arguments and propositions.
Findings
The findings not only revealed the impacts of the gig economy on the hospitality workforce at micro-meso-macro levels but also underscored its close relationships with various concepts in the hospitality management literature. Both future research directions and practical implications are provided.
Practical implications
Amid the gig economy’s transformative influence, stakeholders must continually innovate for an empowering and secure work environment. A holistic approach is necessary to establish a harmonious gig ecosystem, ensuring fair treatment, benefits and protection for workers while fostering growth and well-being.
Originality/value
Throughout the paper, a critical reflection on the impact of the gig economy on the hospitality workforce is presented, along with suggestions for coping with current labor issues in hospitality and tourism. Future research directions are outlined.
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Danqing Fang, Chengjin Wu, Yansong Tan, Xin Li, Lilan Gao, Chunqiu Zhang and Bingjie Zhao
The paper aims to study the effect of sintering temperature on the microstructure, shear strength and ratcheting fatigue life of nanosilver sintered lap shear joint. In addition…
Abstract
Purpose
The paper aims to study the effect of sintering temperature on the microstructure, shear strength and ratcheting fatigue life of nanosilver sintered lap shear joint. In addition, the Gerber model is used to predict the ratcheting fatigue lives of nanosilver sintered lap shear joints at different sintering temperatures.
Design/methodology/approach
In this paper, the nanosilver sintered lap shear joints were prepared at three sintering temperatures of 250 °C, 280 °C and 310 °C. The bonding quality was characterized by scanning electron microscopy, X-ray diffraction, transmission electron microscope and shear tests, and the long-term reliability was studied by conducting ratcheting fatigue tests. In addition, three modified models based on Basquin equation were used to predict the ratcheting fatigue life of nanosilver sintered lap shear joint and their accuracies were evaluated.
Findings
When the sintering temperature is 250°C, the nanosilver sintered lap shear joint shows the porosity of 22.9 ± 1.6 %, and the shear strength of 22.3 ± 2.4 MPa. Raising the sintering temperature enhances silver crystallite size, strengthens sintering necks, thus improves shear strength and ratcheting fatigue life in joints. In addition, the ratcheting fatigue lives of the joints sintered at different temperatures are effectively predicted by three equivalent force models, and the Gerber model shows the highest life prediction accuracy.
Research limitations/implications
The sintered silver bondline is suffering a complex stress state. The study only takes the shear stress into consideration. The tensile stress and the combination of shear stress and tensile stress can to be considered in the future study.
Practical implications
The paper provides the experimental and theoretical support for robust bonding and long-term reliability of sintered silver structure.
Social implications
The introduced model can predict the ratcheting fatigue lives of the joints sintered at different temperatures, which shows a potential in engineering applications.
Originality/value
The study revealed the relationship between the sintering temperature and the microstructure, the shear strength and the ratcheting fatigue life of the joint. In addition, the Gerber model can predict the ratcheting fatigue life accurately at different sintering temperatures.
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The purpose of this paper is to contribute to the existing knowledge system of lean supply chain management (LSCM), i.e. by using main path analysis, and the authors extract the…
Abstract
Purpose
The purpose of this paper is to contribute to the existing knowledge system of lean supply chain management (LSCM), i.e. by using main path analysis, and the authors extract the main development track of LSCM. It is advantageous for relevant scholars to deepen their understanding of this academic field from a bibliometrics view to grasp the future directions better.
Design/methodology/approach
Structuring a citation network with the processed data set containing 866 papers and relevant information collected from Web of Science (WoS). Conducting review analyses aiming at the main paths that are extracted from the above citation network.
Findings
There are two different evolution paths in LSCM field, i.e. improving corporate sustainability performance through combining lean and green practices, and seeking the balance between lean and agility to structure leagile supply chain for specific industries. LSCM research studies mainly focus on five aspects: (1) establishment and development of LSCM theory; (2) structuration of lean supply chain; (3) research studies of the relationship between LSCM and corporate performance; (4) supply chain evaluation system; and (5) review and vista of LSCM field. The intersection of two knowledge evolute routes would be Industry 4.0, which is an integrated theory system combining lean, agility, green and other supply chain thinking.
Research limitations/implications
The data set collected from WoS cannot contain all the research studies about LSCM is the main research limitation. Sustainability, as represented by environmental performance, will continue to be a major pursuit of this field. Integrating LSCM in Industry 4.0 will be the next hotspot in LSCM field.
Practical implications
Providing the main research contents and common methods of LSCM field. It is conducive to deepening the understanding of relevant practitioners and scholars to LSCM field from a dynamic perspective.
Originality/value
To the best of the authors’ knowledge, it is the first time to reveal the knowledge diffuse trajectories of LSCM under different view with main path analysis. This study is unique that it provides a new view to understand the field of LSCM.