Manish Gupta, Musarrat Shaheen and Prathap K. Reddy
The purpose of this paper is to examine the mediating role of work engagement (WE) between psychological capital (PsyCap) and the two facets of organizational citizenship behavior…
Abstract
Purpose
The purpose of this paper is to examine the mediating role of work engagement (WE) between psychological capital (PsyCap) and the two facets of organizational citizenship behavior (OCB) which involves both individual and organization. It also examines the moderating role of perceived organizational support (POS) between PsyCap and WE, and WE and the two facets of OCB.
Design/methodology/approach
A total of 293 responses gathered from employees working in diverse service sector industries in India were assessed using structural equation modeling.
Findings
Overall, the results support the mediating role of WE in the PsyCap-OCB relationship, and the moderation of POS between WE and the two facets of OCB.
Research limitations/implications
This study helps in understanding how WE-OCB relationship can be negatively affected in the presence of high POS.
Practical implications
The results encourage organizations to establish systems for enhancing the engagement levels of their employees, which according to this study may be achieved by creating and maintaining vibrant work environment.
Originality/value
This study helps in understanding the role of POS among PsyCap, WE, \and the two factors of OCB.
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Gives a bibliographical review of the finite element methods (FEMs) applied for the linear and nonlinear, static and dynamic analyses of basic structural elements from the…
Abstract
Gives a bibliographical review of the finite element methods (FEMs) applied for the linear and nonlinear, static and dynamic analyses of basic structural elements from the theoretical as well as practical points of view. The range of applications of FEMs in this area is wide and cannot be presented in a single paper; therefore aims to give the reader an encyclopaedic view on the subject. The bibliography at the end of the paper contains 2,025 references to papers, conference proceedings and theses/dissertations dealing with the analysis of beams, columns, rods, bars, cables, discs, blades, shafts, membranes, plates and shells that were published in 1992‐1995.
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A study of the behaviour of shear deformable plate finite elements is carried out to determine why and under what conditions these elements lock, or become overly stiff. A new…
Abstract
A study of the behaviour of shear deformable plate finite elements is carried out to determine why and under what conditions these elements lock, or become overly stiff. A new analytical technique is developed to derive the exact form of the shear constraints which are imposed on an element when its side‐to‐thickness ratio is large. The constraints are expressed in terms of the nodal degrees of freedom, and are interpreted as being either the proper Kirchhoff constraints or spurious locking constraints. To gain a better understanding of locking phenomena, the constraints which arise under full and reduced integration are derived for various plate elements. These include bilinear, biquadratic, eight‐node serendipity and heterosis elements. These analytical findings are compared with numerical results of isotropic and laminated composite plates, verifying the role that shear constraints play in determining the behaviour of thin shear deformable elements. The results of the present study lead to definitive conclusions regarding the origin of locking phenomena and the effect of reduced integration.
Seok‐Soon Lee, Jeong Seo Koo and Jin Min Choi
Two‐noded curved beam elements, CMLC and IMLC, are developed on the basis of Timoshenko’s beam theory and curvilinear co‐ordinates. These elements are developed by the separation…
Abstract
Two‐noded curved beam elements, CMLC and IMLC, are developed on the basis of Timoshenko’s beam theory and curvilinear co‐ordinates. These elements are developed by the separation of the radial displacement into the bending and the shear deflection and the projection of the shear deflection into bending deflection. In the CMLC element, field‐consistent membrane strain interpolation is adapted for removing the membrane locking. The CMLC element shows the rapid and stable convergence on the wide range of radius, thickness and length of the curved beam. The field‐consistent membrane strain and the separation of radial displacement produce the most efficient linear element possible.
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Rajlakshmi Banerjee and Barry Quinn
This study aims to focus on local food consumption and specifically seeks to explore how consumers construct the meaning of local food and the nature of relationships between key…
Abstract
Purpose
This study aims to focus on local food consumption and specifically seeks to explore how consumers construct the meaning of local food and the nature of relationships between key influences on the local food purchase intention.
Design/methodology/approach
A two-stage qualitative methodology was adopted consisting of five focus group discussions and 25 semi-structured interviews with consumers in Northern Ireland. Focus groups explored consumer meanings of local food. Semi-structured interviews sought to explore in more depth the inter-relationships between the influences on the purchase intention and the role of moral norms.
Findings
Five key influences on the purchase intention are identified (quality attributes, experience and familiarity, emotional attributes, the setting, support for the local economy). These influences are connected with a range of self-interest, altruistic and moral factors.
Research limitations/implications
This study was undertaken in a specific geographical setting and thus the generalisation of the findings is limited. Future research should ascertain the views of stakeholders (producers and retailers) to provide multi-actor constructions and understandings of local food.
Practical implications
There are a number of practical implications for marketers from this study that provide considerable scope to differentiate local food products. A more nuanced understanding of consumer motivations and their understanding of local food will help marketers to develop brand image linked to the themes identified here such as product familiarity and rural connections. Furthermore, the local food servicescape or setting should be managed carefully to construct an emotional attachment and positive consumer experience, whilst promoting trust and perceptions of quality.
Originality/value
Previous studies on local food consumer behaviour have considered the influences on local food consumer behaviour in quite binary terms (self-interest and altruistic factors). This study unpicks the key influences on the purchase intention, based on a thematic analysis, and proposes a new categorisation and set of interrelationships around five key themes.
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The purpose of this paper is to develop a computational technique to couple finite element and meshfree methods for locking‐free analysis of shear deformable beams and plates, and…
Abstract
Purpose
The purpose of this paper is to develop a computational technique to couple finite element and meshfree methods for locking‐free analysis of shear deformable beams and plates, and to impose the boundary conditions directly when the matching field approach is adopted in the meshfree region.
Design/methodology/approach
Matching field approach eliminates shear‐locking which may occur due to inconsistencies in the approximations of the transverse displacement and rotation fields in shear‐deformable beams and plates. Continuous blending method is modified in order to be able to satisfy the constraint conditions of the matching field strategy.
Findings
For both transverse displacement and rotation fields, the developed technique produces approximation functions that satisfy the Kronecker delta property at the required nodes of the meshfree region when the matching field approach is adopted.
Originality/value
This approach allows for direct assembly of the stiffness matrices that are built for separate finite element and meshfree regions when the matching field approach is adopted. The boundary conditions can be directly applied, and the reaction forces can also be calculated directly from the structural stiffness matrix by using the developed technique.
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Ayush Varshney, Arshad H. Khan, M. Yaqoob Yasin, Zahid A. Khan and Mohammad Asjad
The purpose of this paper is to present the multi-objective optimization of the dynamic response of isotropic and laminated composite folded plates. The dynamic analysis has been…
Abstract
Purpose
The purpose of this paper is to present the multi-objective optimization of the dynamic response of isotropic and laminated composite folded plates. The dynamic analysis has been carried out using the finite element method based on the first-order shear deformation theory.
Design/methodology/approach
Hamilton’s principle has been employed for the derivation of the governing equations. Natural frequencies are obtained using the eigenvalue extraction method. The optimal combination of the crank angle, lamination scheme and boundary conditions on the natural frequencies of folded plates for their safe and optimal dynamic design has been obtained. The analysis has been carried out using finite element approach based on FSDT to obtain the dynamic equation of single- and double-fold laminated plates. In total, 15 experiments as per Taguchi’s standard L15 orthogonal array have been performed. Further, standard deviation (SD) based TOPSIS method is used to perform multi-response optimization of folded plates in order to rank the combination of the input parameters.
Findings
SD integrated with TOPSIS reveals that Experiment No. 8 (crank angle=90° and anti-symmetric lamination scheme=0°/90°/0°/90°), Experiment No. 14 (crank angle=150° and anti-symmetric lamination scheme=0o/90o/0o/90o), Experiment No. 2 (crank angle=30° and anti-symmetric lamination scheme=0°/90°/0°/90°) and Experiment No. 3 (crank angle=30° and symmetric lamination scheme=0°/90°/0°/90°) occupy rank 1 for one fold, one end clamped, one fold, two ends clamped, two folds, one end clamped and two folds, two ends clamped conditions, respectively, in order to maximize the modal response corresponding to the fundamental mode.
Originality/value
SD-based technique for order of preference by similarity to ideal solution (TOPSIS) method is used to rank the process parameters. The optimum combination of the input parameters on the multi-response optimization of dynamics of the folded plates has also been evaluated using the analysis of mean (ANOM).
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Changsheng Wang, Xiao Han, Caixia Yang, Xiangkui Zhang and Wenbin Hou
Numerous finite elements are proposed based on analytical solutions. However, it is difficult to find the solutions for complicated governing equations. This paper aims to present…
Abstract
Purpose
Numerous finite elements are proposed based on analytical solutions. However, it is difficult to find the solutions for complicated governing equations. This paper aims to present a novel formulation in the framework of assumed stress quasi-conforming method for the static and free vibration analysis of anisotropic and symmetric laminated plates.
Design/methodology/approach
Firstly, an initial stress approximation ruled by 17 parameters, which satisfies the equilibrium equations is derived to improve the performance of the constructed element. Then the stress matrix is treated as the weighted function to weaken the strain-displacement equations. Finally, the Timoshenko’s laminated composite beam functions are adopted as boundary string-net functions for strain integration.
Findings
Several numerical examples are presented to show the performance of the new element, and the results obtained are compared with other available ones. Numerical results have proved that the new element is free from shear locking and possesses high accuracy for the analysis of anisotropic and symmetric laminated plates.
Originality/value
This paper proposes a new QC element for the static and free vibration analysis of anisotropic and symmetric laminated plates. In contrast with the complicated analytical solutions of the equilibrium equations, an initial stress approximation ruled by 17 parameters is adopted here. The Timoshenkos laminated composite beam functions are introduced as boundary string-net functions for strain integration. Numerical results demonstrate the new element is free from shear locking and possesses high accuracy for the analysis of anisotropic and symmetric laminated plates.
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Xiantao Zhang and Wei Liu
In the coupling of aircraft pipeline structures, current research works mainly focus on fluid-solid coupling effects or a single part of structure vibration like a pipeline…
Abstract
Purpose
In the coupling of aircraft pipeline structures, current research works mainly focus on fluid-solid coupling effects or a single part of structure vibration like a pipeline. Because of the clamp, the pipe vibration caused by fluid pulsation was transmitted to the body, and the body vibration was also transmitted to the pipe structure. Thus, the relationship between the airframe and the pipeline system cannot be separated, and the influence of airframe needs to be considered when coupling structure under vibration. The paper aims to discuss these issues.
Design/methodology/approach
This paper aims to investigate the influence of pipeline layouts on airframe-clamps-pipeline (ACP) structure’s dynamic response by experiment and simulation method. First, ACP structures are established including three parts. The natural frequencies and mode shapes are obtained by hammering experiment. The mode results are in agreement with numerical simulation. By using electromagnetic vibration shaker, extinction is applied on ACP structure, and then the dynamic responses of structure can be obtained by test equipments. The influence principle of pipeline layouts is obtained by dynamic response analysis. The present study provides a method for pipeline layout design in aerospace engineering.
Findings
Under the ACP’s first-order resonance frequency excitation, the maximum stress increases when the Z-shaped pipeline bending position changes from 1/2 to 1/5. The opposite way occurs under the only pipeline resonance frequency excitation. The stress amplitudes near both sides (inner and outer) of the clamp on the plate surface change with the excitation frequency. Under the ACP’s first-order resonance frequency excitation, the outer side stress is larger than the inner side stress, but under the only pipeline resonance frequency excitation, the inner side stress is larger than the outer side stress.
Originality/value
The study of the effect of pipeline layout parameters on ACP structure provides a method for pipeline layout design in aerospace engineering.
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Sana Ben Salah and Mohamed Bechir Ben Hamida
The purpose of this paper is to compare the thermal effect between square and circular geometry of light emitting diode (LED) with respect of the same surface for the intent of…
Abstract
Purpose
The purpose of this paper is to compare the thermal effect between square and circular geometry of light emitting diode (LED) with respect of the same surface for the intent of reducing the junction temperature.
Design/methodology/approach
The heat equation is presented in a dimensionless form. To solve it numerically subject to the boundary conditions, the authors realized a three-dimensional code with Comsol Multiphysics.
Findings
The model is validated with previously published works. The authors found a good agreement.
Originality/value
New design of heat sink is improved for circular LED and a reduction of 18 per cent of the junction temperature is permitted. The authors study the influence of various parameters: number and length of fins and number and width of splits. New distribution of multichip LED in circular geometry permits to put 42 chips instead of 36 chips with respect of the same surface and pitch and with reduction of the junction temperature by 16 per cent.