The purpose of the paper is researching on the motion law of fiber in the vortex field inside the nozzle.
Abstract
Purpose
The purpose of the paper is researching on the motion law of fiber in the vortex field inside the nozzle.
Design/methodology/approach
A three-dimensional calculation model was established using the MVS861 (Muratec Vortex Spinning) air-jet vortex-spinning nozzle as the prototype, and the fluid–solid coupling calculation module in the finite element calculation software ADINA (Adina System) was used to numerically analyze the fiber-air flow two-phase coupling. At the same time, the effect of the air pressure at the nozzle on the two-phase flow is studied.
Findings
The results show that after the air flow ejected through the nozzle, a vortex field will be generated in the flow field to push the internal fiber to move toward the nozzle outlet in a wave motion; as the air pressure at the nozzle increases, the fiber movement period becomes shorter and the oscillation frequency becomes higher; increasing the air pressure at the spray hole can improve the working efficiency of fiber twisting and wrapping.
Originality/value
The research present an effective and feasible theoretical model and method for the motion law of fiber in the vortex field inside the nozzle based on ADINA fluid–structure coupling model.
Details
Keywords
Yin Shi, Liping Ding, Chenchen He, Fan Zhang, Zumeng Zhang and Qiyao Dai
This study aims to analyze those factors affecting the rural resident’s willingness to adopt solar photovoltaic (PV) which is important for accelerating the popularization of…
Abstract
Purpose
This study aims to analyze those factors affecting the rural resident’s willingness to adopt solar photovoltaic (PV) which is important for accelerating the popularization of clean energy in China.
Design/methodology/approach
This study contained a sample of 653 households in 8 provinces/regions by stratified, and random sampling in rural China. Descriptive analysis, exploratory factor analysis and confirmatory factor analysis techniques have been used for analytical purposes.
Findings
The empirical results indicate that financial incentive and social interaction have positive effects on rural residents’ adoption willingness, while village leaders’ engagement can indirectly influence their adoption willingness through social interaction and residents’ cognition.
Research limitations/implications
This study mainly considers external and internal factors but ignores the effect of technical factors. In addition, the samples are just selected from the residents who have adopted solar PV.
Practical implications
This study is expected to be useful for the government, regulators, village leaders, village leaders and other institutions.
Originality/value
This study conducts a systematic analysis and clarifies the relationship between factors (external and internal) and rural residents’ adoption willingness. The village leaders’ engagement is first added to the conceptual model as an external factor, which is very essential in rural residents’ adoption in China.
Details
Keywords
Qing Liu, Chengjun Wang, Chenchen Shang and Jiabao Li
The purpose of this study is to reduce the residual stress in welded workpieces, optimize the vibratory stress relief treatment process through the use of a vibration generator…
Abstract
Purpose
The purpose of this study is to reduce the residual stress in welded workpieces, optimize the vibratory stress relief treatment process through the use of a vibration generator and enhance the durability and longevity of the workpiece by developing a vibratory stress relief robot that incorporates a multi-manipulator system.
Design/methodology/approach
The multi-manipulator combination work is designed so that each manipulator is deployed according to the requirements of vibration stress relief work. Each manipulator works independently and coordinates with others to achieve multi-dimensional vibratory stress relief of the workpiece. A two-degree-of-freedom mobile platform is designed to enable the transverse and longitudinal movement of the manipulator, expanding the working space of the robot. A small electromagnetic superharmonic vibration generator is designed to produce directional vibrations in any orientation. This design addresses the technical challenge of traditional vibration generators being bulky and unable to achieve directional vibrations.
Findings
The residual stress relief experiment demonstrates that the residual stress of the workpiece is reduced by approximately 73% through three-degree-of-freedom vibration. The multi-dimensional vibration effectively enhances the relief effect of residual stress, which is beneficial for improving the strength and service life of the workpiece.
Originality/value
A new multi-manipulator robot is proposed to alleviate the residual stress generated by workpiece welding by integrating vibratory stress relief with robotics. It is beneficial to reduce material and energy consumption while enhancing the strength and service life of the workpiece.
Details
Keywords
Zhenmin Yuan, Yuan Chang, Yunfeng Chen, Yaowu Wang, Wei Huang and Chen Chen
Precast wall lifting during prefabricated building construction faces multiple non-lean problems, such as inaccurate lifting-time estimation, unreasonable resource allocation and…
Abstract
Purpose
Precast wall lifting during prefabricated building construction faces multiple non-lean problems, such as inaccurate lifting-time estimation, unreasonable resource allocation and improper process design. This study aims to identify the pathways for improving lifting performance to advance lean construction of prefabricated buildings.
Design/methodology/approach
This study developed a methodological framework that integrates the discrete event simulation method, the elimination, combination, rearrangement and simplification (ECRS) technique and intelligent optimization tool. Two schemes of precast wall lifting, namely, the enterprise's business as usual (BAU) and enterprise-leading (EL) schemes, were set to benchmark lifting performance. Furthermore, a best-practice (BP) scheme was modeled from the perspective of lifting activity ECRS and resource allocation for performance optimization.
Findings
A real project was selected to test the effect of the methodological framework. The results showed that compared with the EL scheme, the BP scheme reduced the total lifting time (TLT) by 6.3% and mitigated the TLT uncertainty (the gap between the maximum and minimum time values) by 20.6%. Under the BP scheme, increasing the resource inputs produces an insignificant effect in reducing TLT, i.e. increasing the number of component operators in the caulking subprocess from one to two only shortened the TLT by 3.6%, and no further time reduction was achieved as more component operators were added.
Originality/value
To solve non-lean problems associated with prefabricated building construction, this study provides a methodological framework that can separate a typical precast wall lifting process into fine-level activities. Besides, it also identifies the pathways (including the learning effect mitigation, labor and machinery resource adjustment and activities’ improvement) to reducing TLT and its uncertainty.
Details
Keywords
Qinyang Bai, Xaioqin Yin, Ming K. Lim and Chenchen Dong
This paper studies low-carbon vehicle routing problem (VRP) for cold chain logistics with the consideration of the complexity of the road network and the time-varying traffic…
Abstract
Purpose
This paper studies low-carbon vehicle routing problem (VRP) for cold chain logistics with the consideration of the complexity of the road network and the time-varying traffic conditions, and then a low-carbon cold chain logistics routing optimization model was proposed. The purpose of this paper is to minimize the carbon emission and distribution cost, which includes vehicle operation cost, product freshness cost, quality loss cost, penalty cost and transportation cost.
Design/methodology/approach
This study proposed a mathematical optimization model, considering the distribution cost and carbon emission. The improved Nondominated Sorting Genetic Algorithm II algorithm was used to solve the model to obtain the Pareto frontal solution set.
Findings
The result of this study showed that this model can more accurately assess distribution costs and carbon emissions than those do not take real-time traffic conditions in the actual road network into account and provided guidance for cold chain logistics companies to choose a distribution strategy and for the government to develop a carbon tax.
Research limitations/implications
There are some limitations in the proposed model. This study assumes that there are only one distribution and a single type of vehicle.
Originality/value
Existing research on low-carbon VRP for cold chain logistics ignores the complexity of the road network and the time-varying traffic conditions, resulting in nonmeaningful planned distribution routes and furthermore low carbon cannot be discussed. This study takes the complexity of the road network and the time-varying traffic conditions into account, describing the distribution costs and carbon emissions accurately and providing the necessary prerequisites for achieving low carbon.
Details
Keywords
Heekyung Jang and Jianhui Chen
The purpose of this paper is to use body shape analysis and develop a 3D virtual body formation and deformation model that can accurately express size and shape.
Abstract
Purpose
The purpose of this paper is to use body shape analysis and develop a 3D virtual body formation and deformation model that can accurately express size and shape.
Design/methodology/approach
In this paper, 1,882 sets of direct measurement data of Korean women in their 20s (19–29 years) were analyzed. These data sets were sourced from the sixth and seventh “Size Korea” anthropometric survey data. Through body shape analysis, the authors classified them into seven body types and selected their representative bodies. A 2D image based on the height, breadth, depth and length was first formed, and the representative virtual body was modeled using the polygon technique. The authors calculated the grading ratios for each body type according to the clothing sizing system, and modified the virtual body size type by morphing technique.
Findings
In order to accurately evaluate the fit in a virtual fitting system, it is necessary to study the body size and shape of the target age; this makes it possible to form virtual body reflecting the size and shape.
Originality/value
In this paper, the authors propose a new 3D virtual body formation method that is more accurate in shape and size compared to the present system. Through this, it will be possible to grasp the accurate simulation state in the virtual fitting system, and thereby evaluate the accurate fit.
Details
Keywords
Haiyang Hu, Yu Wang, Chenchen Lian and Peiyan Wang
In this paper, an attempt is made to obtain buckling loads, ultimate bearing capacity and other required structural characteristics of grid structure panels. The numerical method…
Abstract
Purpose
In this paper, an attempt is made to obtain buckling loads, ultimate bearing capacity and other required structural characteristics of grid structure panels. The numerical method for post-buckling behavior analysis of panels involving multiple invisible damages is also presented.
Design/methodology/approach
In this paper, two bidirectional stiffened composite panels are manufactured and tested. Multiple discrete invisible damages are introduced in different positions of the stringers, and the experimental and simulation investigation of buckling and post-buckling were carried out on the damaged stiffened panels.
Findings
The simulation load–displacement curves are compared with the experimental results, and it is found that the simulation model can well predict the occurrence of buckling and failure loads. The strain curve shows that the rate of strain change at the damaged site is greater than that at the undamaged site, which reflects that the debond is more likely occurred at the damaged site. The simulation verifies that the panel is usually crushed due to matrix compression and fiber–matrix shear.
Originality/value
In this paper, post-buckling tests and numerical simulations of bidirectional stiffened composite panels with impact damage were carried out. Two panels with four longitudinal stringers and two transverse stringers were manufactured and tested. The buckling and post-buckling characteristics of the grid structure are obtained, and the failure mechanism of the structure is explained. This is helpful for the design of wall panel structure.
Details
Keywords
To obtain an understanding of the disposition of Chinese agriculture.
Abstract
Purpose
To obtain an understanding of the disposition of Chinese agriculture.
Design/methodology/approach
By applying econometric methods to make a narrow assessment on several productive factors in Chinese agriculture covering most of the era of Reforms and openness, a picture portraying the traits of Chinese rural society is provided. The author delves deep into the foundations of econometric as well as western society to draw comparisons between Occidental and oriental society.
Findings
Unlike the widely held view that implicitly identifies the basis of studies in Chinese economical development with that in western nations, the presented idea illuminates the intrinsic “upper‐hand” disposition of Chinese rural society, which has so far practically made China tread a path different from that in western society.
Research limitations/implications
Since the paper deals with the whole picture of Chinese agriculture, it presumably may cause partial loss of accuracy in econometric calculations.
Practical implications
It provides a fresh yet in‐depth idea for western researchers.
Originality/value
The paper breaks fresh ground in Chinese study and economic theory for researchers who are confused with the intricacy of the Chinese agricultural economy.
Details
Keywords
Uzma Batool, Muhammad Mustafa Raziq, Naukhez Sarwar, Sharjeel Saleem and Asfia Obaid
The purpose of this study is to examine the impact of paradoxical leader behavior (PLB) on leader effectiveness (LE). The authors propose an underlying mechanism of this…
Abstract
Purpose
The purpose of this study is to examine the impact of paradoxical leader behavior (PLB) on leader effectiveness (LE). The authors propose an underlying mechanism of this relationship and examine if the stated relationship is moderated by job-related and structural uncertainty in the organization.
Design methodology approach
The authors draw on survey data from 127 employees working in public and privately owned organizations and analyze data using AMOS and SPSS.
Findings
Results offer partial support to the authors’ hypotheses indicating that paradoxical leader behavior is positively associated to LE. As expected, the relationship is negatively moderated by structural uncertainty indicating that LE is weakened where there is structural uncertainty in the organization. However, in contrast to our other assumption, the authors find a positive (rather than negative) moderating role of job-related uncertainty in the PLB–LE relationship.
Originality value
Paradoxes are everywhere and inherently embedded in complex and dynamic organizational systems. To deal with paradoxes, organizational leaders often seek to act paradoxically. However, not every leader has a paradoxical mindset, and where a leader has such, it remains unclear if they will prove to be effective leaders. What can further influence the effectiveness of such leaders is the uncertainty that organizations face in the today’s dynamic environments. In this study, the authors contribute to paradox theory and the paradoxical leadership literature by unfolding the boundary conditions which can influence paradoxical leader’s effectiveness.
Details
Keywords
Hoa D.X. Trieu, Phuong V. Nguyen, Khoa Tien Tran, Demetris Vrontis and Zafar Ahmed
In the current highly volatile and uncertain economic environment, recovery strategies that emphasise attributes and skills are essential for an enterprise to recover and adapt to…
Abstract
Purpose
In the current highly volatile and uncertain economic environment, recovery strategies that emphasise attributes and skills are essential for an enterprise to recover and adapt to disruptions. Based on the resource-based view (RBV), this study aims to understand how organisational resilience functions and its outcomes. Specifically, this study establishes links between organisational resilience and internal capabilities in information technology (IT) applications, exploitation-exploration activities and organisational leadership, which are represented by IT competencies, organisational ambidexterity and paradoxical leadership, respectively. The study also analyses the role of government digital transformation policies after the COVID-19 pandemic as an external resource.
Design/methodology/approach
This study provides empirical evidence of the dynamic relationships between organisational resilience, ambidexterity and performance under the interactions IT competencies, digital transformation policies and paradoxical leadership by using data collected from 336 small- and medium-sized enterprises (SMEs) in Vietnam and the partial least squares-structural equation modelling technique.
Findings
IT competencies and organisational ambidexterity strengthen organisational resilience, reduce missed opportunities and increase organisations’ responsiveness to market volatility. Increasing organisational ambidexterity and resilience enhances the business performance of SMEs. Paradoxical leadership favours organisational ambidexterity and resilience and their outcomes. Digital transformation policies from the government can support SMEs’ IT competencies and resilience.
Originality/value
To the best of the authors’ knowledge, this study based on the RBV is the first to show how integrating external resources with dynamic capabilities such as organisational ambidexterity and resilience can help SMEs build and maintain a sustainable competitive advantage in highly uncertain environments. This research emphasises the vital role of organisational resilience in improvising changes in working processes in response to unexpected events and the importance of a strategy for developing the capability to anticipate a wide variety of situations and seize opportunities quickly.