A fast algorithm for the adaptive discretization of 3D parametric curves

2019 ◽  
Vol 37 (5) ◽  
pp. 1663-1682
Author(s):  
Jianming Zhang ◽  
Chuanming Ju ◽  
Baotao Chi
Keyword(s):  
Mesh Generation ◽  
Fast Algorithm ◽  
Design Methodology ◽  
Three Dimensional ◽  
Parametric Curves ◽  
Content Type ◽  
Gaussian Integration ◽  
Optimal Discretization ◽  
Adaptive Discretization ◽  
Conventional Algorithm

Purpose The purpose of this paper is to present a fast algorithm for the adaptive discretization of three-dimensional parametric curves. Design/methodology/approach The proposed algorithm computes the parametric increments of all segments to obtain the parametric coordinates of all discrete nodes. This process is recursively applied until the optimal discretization of curves is obtained. The parametric increment of a segment is inversely proportional to the number of sub-segments, which can be subdivided, and the sum of parametric increments of all segments is constant. Thus, a new expression for parametric increment of a segment can be obtained. In addition, the number of sub-segments, which a segment can be subdivided is calculated approximately, thus avoiding Gaussian integration. Findings The proposed method can use less CPU time to perform the optimal discretization of three-dimensional curves. The results of curves discretization can also meet requirements for mesh generation used in the preprocessing of numerical simulation. Originality/value Several numerical examples presented have verified the robustness and efficiency of the proposed algorithm. Compared with the conventional algorithm, the more complex the model, the more time the algorithm saves in the process of curve discretization.

A biomimetic 3D airflow sensor made of an array of two piezoelectric metal-core fibers

Sensor Review ◽  
2017 ◽  
Vol 37 (3) ◽  
pp. 312-321 ◽  
Author(s):  
Yixiang Bian ◽  
Can He ◽  
Kaixuan Sun ◽  
Longchao Dai ◽  
Hui Shen ◽  
...  
Keyword(s):  
Design Methodology ◽  
Spherical Surface ◽  
Three Dimensional ◽  
Three Dimensions ◽  
Piezoceramic Cylinder ◽  
Metal Core ◽  
Content Type ◽  
3D Space ◽  
Highly Sensitive ◽  
Airflow Sensor

Purpose The purpose of this paper is to design and fabricate a three-dimensional (3D) bionic airflow sensing array made of two multi-electrode piezoelectric metal-core fibers (MPMFs), inspired by the structure of a cricket’s highly sensitive airflow receptor (consisting of two cerci). Design/methodology/approach A metal core was positioned at the center of an MPMF and surrounded by a hollow piezoceramic cylinder. Four thin metal films were spray-coated symmetrically on the surface of the fiber that could be used as two pairs of sensor electrodes. Findings In 3D space, four output signals of the two MPMFs arrays can form three “8”-shaped spheres. Similarly, the sensing signals for the same airflow are located on a spherical surface. Originality/value Two MPMF arrays are sufficient to detect the speed and direction of airflow in all three dimensions.

Comparison of the reluctance laminated and solid rotor synchronous machine operating at high temperatures

2019 ◽  
Vol 38 (4) ◽  
pp. 1111-1119 ◽  
Author(s):  
Marcin Lefik ◽  
Krzysztof Komeza ◽  
Ewa Napieralska-Juszczak ◽  
Daniel Roger ◽  
Piotr Andrzej Napieralski
Keyword(s):  
High Speed ◽  
Design Methodology ◽  
Three Dimensional ◽  
Synchronous Machine ◽  
Point Of View ◽  
Heat Sources ◽  
Model Calculations ◽  
Content Type ◽  
Thermal Phenomenon ◽  
Practical Implications

Purpose The purpose of this paper is to present a comparison between reluctance synchronous machine-enabling work at high internal temperature (HT° machine) with laminated and solid rotor. Design/methodology/approach To obtain heat sources for the thermal model, calculations of the electromagnetic field were made using the Opera 3D program including effect of rotation and the resulting eddy current losses. To analyse the thermal phenomenon, the 3D coupled thermal-fluid (CFD) model is used. Findings The presented results show clearly that laminated construction is much better from a point of view of efficiency and temperature. However, solid construction can be interesting for high speed machines due to their mechanical robustness. Research limitations/implications The main problem, despite the use of parallel calculations, is the long calculation time. Practical implications The obtained simulation and experimental results show the possibility of building a machine operating at a much higher ambient temperature than it was previously produced for example in the vicinity of the aircraft turbines. Originality/value The paper presents the application of fully three-dimensional coupled electromagnetic and thermal analysis of new machine constructions designed for elevated temperature.

Buckling analysis of a delaminated panel by using a kinematic global-local coupling approach

2014 ◽  
Vol 5 (4) ◽  
pp. 262-278
Author(s):  
A. Sellitto ◽  
R. Borrelli ◽  
F. Caputo ◽  
A. Riccio ◽  
F. Scaramuzzino
Keyword(s):  
Design Methodology ◽  
Three Dimensional ◽  
Matrix Cracking ◽  
Composite Panel ◽  
Stiffened Panel ◽  
Local Approach ◽  
Content Type ◽  
Kinematic Coupling ◽  
Coupling Approach ◽  
Delamination Front

Purpose – The purpose of this paper is to investigate on the behaviour of a delaminated stiffened panel; the delamination growth is simulated via fracture elements implemented in B2000++® code based on the Modified Virtual Crack Closure Technique (MVCCT), matrix cracking and fibre failure have been also taken into account. Design/methodology/approach – In order to correctly apply the MVCCT on the delamination front a very fine three-dimensional (3D) mesh is required very close to the delaminated area, while a 2D-shell model has been employed for the areas of minor interest. In order to couple the shell domain to the solid one, shell-to-solid coupling elements based on kinematic constraints have been used. Findings – Results obtained with the global/local approach are in good correlation with those obtained with experimental results. Originality/value – The global/local approach based on kinematic coupling elements in conjunction with fracture elements allows to investigate and predict the behaviour of a stiffened delaminated composite panel in an efficient and effective way.

Service quality function deployment by the C-shaped QFD 3D matrix

2018 ◽  
Vol 25 (9) ◽  
pp. 3386-3405 ◽  
Author(s):  
Maryam Hassani ◽  
Arash Shahin ◽  
Manouchehr Kheradmandnia
Keyword(s):  
Quality Function Deployment ◽  
Design Methodology ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Customer Requirements ◽  
Content Type ◽  
Process Characteristics ◽  
The Matrix ◽  
3D Matrix ◽  
Simultaneous Comparison

Purpose The purpose of this paper is to examine the application of C-shaped QFD 3D Matrix in comparing process characteristics (PC), performance aspects (PA) and customer requirements, simultaneously and to prioritize the first two sets, respectively. Design/methodology/approach A three dimensional matrix has been developed with three sets of PC, PA and customers’ requirements and C-shaped matrix has been applied for simultaneous comparison of the dimensions and prioritization of the subsets of PC and PA. The proposed approach has been examined in a post bank. Findings Findings confirm the possibility of simultaneous comparison and prioritization of the three sets of dimensions of this study in post bank services. In addition, “growth and learning” and “bilateral relationship with suppliers” had the first priorities among PA and PC, respectively. Research limitations/implications While the proposed approach has many advantages, filling the matrixes is time-consuming. Since illustrating the 3D matrix was not possible, the matrix was separated into five two-dimensional matrixes. Originality/value Compared to the studied literature, the proposed approach is practically new in the post bank services.

Seven information practices for alleviating information vulnerability

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Devendra Dilip Potnis ◽  
Joseph Winberry
Keyword(s):  
Literature Review ◽  
Design Methodology ◽  
Information Science ◽  
Information Access ◽  
Three Dimensional ◽  
Content Type ◽  
Information Practices ◽  
Information Professionals ◽  
Practical Implications ◽  
Real World Problems

PurposeThis literature review aims to identify conscious, intentional, repetitive and transferrable information-related decisions and activities (i.e. information practices) for individuals to alleviate their information vulnerability. Information vulnerability refers to the lack of access to accurate, affordable, complete, relevant and timely information or the inability to use such information, which can place individuals, communities or society at disadvantage or hurt them.Design/methodology/approachConceptual literature review.FindingsThis review presents seven conscious, intentional, repetitive and transferrable information practices to alleviate information vulnerability.Practical implicationsDue to the transferability potential of the seven information practices, diverse populations in varied contexts could refer to, adapt and benefit from appropriate combinations of information practices and their manifestations. The framework can be used by individuals for alleviating information vulnerability. Thus, this paper responds to the call for conducting action-driven research in information science for addressing real-world problems. Information professionals can help individuals select and implement appropriate combinations of seven information practices for alleviating information vulnerability.Originality/valueWe propose (1) a parsimonious, episodic framework for alleviating information vulnerability, which depicts the inter-relationship among the seven information practices and (2) a three-dimensional plot with information access, use and value as three axes to map the manifestation and outcome of alleviating information vulnerability.

University context matter

2018 ◽  
Vol 60 (7/8) ◽  
pp. 873-890 ◽  
Author(s):  
Elin Merethe Oftedal ◽  
Tatiana A. Iakovleva ◽  
Lene Foss
Keyword(s):  
Design Methodology ◽  
Social Systems ◽  
Three Dimensional ◽  
Two Dimensions ◽  
Opportunity Recognition ◽  
Entrepreneurial Intentions ◽  
Cognitive Structures ◽  
Content Type ◽  
Structural Context ◽  
Educational Programmes

PurposeHow university context (UC) enhances students’ entrepreneurial intentions and opportunity recognition is an emerging topic. It is known that students learn, not only from educational programmes, but also from the context in which they are embedded. The purpose of this paper is to investigate the effect of such context on student’s entrepreneurial intentions and opportunity recognition.Design/methodology/approachThe authors use a three-dimensional institutional framework to describe UC including regulative, normative and cognitive structures. Regulative structures refer to rules and regulations, support initiatives in relation to entrepreneurship; normative structures include shared values and norms; while cognitive structures apply to knowledge among students and faculty. A heterogeneous sample of 196 respondents from five countries was used to create reliable measures of UC and to test the hypotheses with the help of regression analysis.FindingsThe findings indicate that two dimensions of UC in particular (regulative and normative) were shown to be of great importance in increasing entrepreneurial intentions and opportunity recognition among students.Originality/valueThe study contributes to this further by suggesting a reliable and theory-grounded scale of UC. Furthermore, this study adds to the discussion on entrepreneurship education by proving evidence of the importance of UC on entrepreneurial intentions. The important contribution is acknowledgement of the fact that social systems both constrain and enable entrepreneurs in their discovery, evaluation and exploitation of opportunities. The authors have established that “would-be student entrepreneurs” do not exist separately from their structural context. Attempts to understand them outside of this context cannot, therefore, fully capture their nature.

Three-dimensional sustainability of Kaizen

2018 ◽  
Vol 30 (4) ◽  
pp. 391-408 ◽  
Author(s):  
Jesus Mendez ◽  
Mercedes Vila-Alonso
Keyword(s):  
Design Methodology ◽  
Three Dimensional ◽  
Well Being ◽  
Transformation Process ◽  
First Century ◽  
Content Type ◽  
Analytical Technique ◽  
Know How ◽  
Practical Implications

Purpose The purpose of this paper is to know, from a three-dimensional perspective (operational, emotional and behavioral), the process of “putting down roots” related with the implementation of Kaizen until it becomes sustainable. The research aims to know how this “putting down roots” process is carried out, what transformations occur, what elements are involved and what role they represent in achieving sustainability. Design/methodology/approach For this purpose, a methodology based on the case study has been used, an interpretive approach to reality has been adopted as a paradigm and the Grounded Theory has been applied as an analytical technique. Findings The results suggest the existence of a transformation process that leads to creating new habits, beliefs and feelings, a phenomenon that the authors identify as a three-dimensional learning process (operational, emotional and behavioral). Practical implications This type of learning is perceived as a transition toward an organizational culture that ensures the roots of the Kaizen principles, which is essential for its sustainability and which favors the creation of talent and the well-being of employees, two challenges that the Kaizen of the twenty-first century must face. Originality/value The document includes innovative contributions to the Kaizen sustainability phenomenon, as it is dealt with from a three-dimensional perspective that underlies the inhibitors and enablers known in the current literature.

Three-dimensional analysis of anchored wall with concrete bearing pads

2020 ◽  
Vol 18 (6) ◽  
pp. 1469-1486
Author(s):  
Hamed Arefizadeh ◽  
Hadi Shahir
Keyword(s):  
Design Methodology ◽  
Three Dimensional ◽  
Bending Moments ◽  
Dimensional Model ◽  
Discrete Elements ◽  
Three Dimensional Model ◽  
Content Type ◽  
Finite Element Software ◽  
Internal Forces ◽  
Soldier Pile

Purpose Anchorage with concrete bearing pad is commonly used in Iran for stabilization of excavations because of the ease of construction, less costs and less time consumption than the soldier pile method. In this method, a wall facing which includes the concrete bearing pads at the location of the anchors and a shotcrete layer between the bearing pads is constructed parallel to the excavation operation similar to the nailing method. Design/methodology/approach In this paper, using the finite element software Abaqus, a three-dimensional model of the above-mentioned type of wall is constructed, and the effect of spacing and size of bearing pads on the wall behavior is discussed. Findings According to the obtained results, the size of the concrete bearing pads has little effect on wall deformations, but the internal forces and bending moments developed in the shotcrete layer between the bearing pads are greatly influenced by the bearing pads dimensions and spacing. Originality/value Owing to the discrete elements of the wall facing, the behavior of this system is completely three-dimensional.

Building competence to manage contractual claims in international construction environment

2006 ◽  
Vol 13 (1) ◽  
pp. 96-113 ◽  
Author(s):  
Adekunle Sabitu Oyegoke
Keyword(s):  
Construction Industry ◽  
Joint Ventures ◽  
Design Methodology ◽  
Three Dimensional ◽  
Continuing Professional Development ◽  
Successful Implementation ◽  
Content Type ◽  
Fair Dealing ◽  
International Construction ◽  
Operational Management

PurposeThis study was motivated by a belief that existing knowledge on management of a contractual claim in international contracting practice is different from a standardised local practice. The paper is aimed at building competence for managing contractual claims in a standardised practice.Design/methodology/approachComparative studies of British and Finnish contracting practices were used to determine the reason why claims are not pronounced in a standardised practice. Empirical study via direct interviews and questionnaires of a Finnish‐based contractor operating in the Russian markets was used. The players are three‐dimensional in nature where the client, consultants, and contractor come from different countries/practices and two of the projects studied were joint ventures.FindingsThe findings show the effects of: legal system, procurement methods, standardised practice and size of the market on the management of contractual claims. The remedial measures suggested include: operational management, i.e. learning through personal contacts, and management competence development of employees by learning through proper communication and education programmes in a form of continuing professional development.Originality/valueManagement of claims in the construction industry is vital to a successful implementation of the project. It brings about a fair dealing between the project owner and the contractor, improves contractor's cashflow and discourages abandonment of project and disputes. Lack of knowledge in managing claims constitutes a threat to successful implementation of project. The engagement of an expert and knowledge transfer through joint ventures/partnerships are suggested as solutions.

Three dimensional flow of an Oldroyd-B fluid with Newtonian heating

2015 ◽  
Vol 25 (1) ◽  
pp. 68-85 ◽  
Author(s):  
M. Ramzan ◽  
M. Farooq ◽  
M. S. Alhothuali ◽  
H. M. Malaikah ◽  
W. Cui ◽  
...  
Keyword(s):  
Temperature Profile ◽  
Design Methodology ◽  
Three Dimensional ◽  
Series Solutions ◽  
Analysis Method ◽  
Newtonian Heating ◽  
Three Dimensional Flow ◽  
Content Type ◽  
Homotopy Analysis ◽  
Layer Flow

Purpose – The purpose of this paper is to analyze the boundary layer flow of an Oldroyd-B fluid with Newtonian heating. Design/methodology/approach – Series solutions are found by homotopy analysis method. Findings – Temperature profile increases with an increase in conjugate parameter. Increase in parameter β and Prandtl number Pr decreases the temperature profile. Originality/value – This work does not currently exist in the literature.

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