Application of fuzzy axiomatic design methodology for selection of design alternatives

2015 ◽  
Vol 13 (1) ◽  
pp. 2-22 ◽  
Author(s):  
S. Vinodh ◽  
V. Kamala ◽  
K. Jayakrishna
Keyword(s):  
Design Methodology ◽  
Material Selection ◽  
Axiomatic Design ◽  
Design Approach ◽  
Design Parameters ◽  
Content Type ◽  
Design Alternative ◽  
Design Alternatives ◽  
Practical Feasibility ◽  
Case Organization

Purpose – The purpose of this paper is to report a research conducted to apply fuzzy axiomatic design approach for selecting the design alternatives of an overflow valve. Design/methodology/approach – The approach started with the identification of functional requirements (FRs) and design parameters (DPs) and the relationship between them to select the best design alternative. Fuzzy analytical hierarchy process was used to calculate the weightage of FRs. The independence and information axioms were being deployed to validate the selection process. Findings – The most important FRs being identified include “improve manufacturability and adaptability”, “improve ease of operation” and “provide strength and reliability”. The most important DPs are design unification on washer and outlet valve, material selection for improving the strength and reliability and pressure change to check whether the valve is withstanding the pressure using flow analysis. The best design alternative (A1) which deals with material substitution is being implemented in the case organization. The proposed methodology also enables contemporary design engineers to effectively select the best design among a set of alternatives in a fuzzy environment. Research limitations/implications – This paper presents the application of fuzzy axiomatic design for selecting the best design alternative of an overflow valve. The identified best design is being subjected to implementation in the case organization. Practical implications – The industry decision makers were involved throughout the conduct of the study. Hence, the inferences derived from the study possess practical feasibility. Originality/value – The application of the fuzzy axiomatic design approach for selecting the best design alternative of an overflow valve is the original contribution of the authors. Also, the practical feasibility of the approach is also being exemplified.

Effects of piston design parameters on skirt-liner dynamic behavior

2016 ◽  
Vol 68 (2) ◽  
pp. 250-258 ◽  
Author(s):  
Ridha Mazouzi ◽  
Ahmed Kellaci ◽  
Abdelkader Karas
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Power Loss ◽  
Design Methodology ◽  
Great Influence ◽  
Structural Deformation ◽  
Design Parameters ◽  
Content Type ◽  
Piston Cylinder ◽  
Oil Film Pressure

Purpose – This paper aims to study the effect of piston skirt design parameters on the dynamic characteristics of a piston–cylinder contact. Design/methodology/pproach – This paper focuses on an analysis of the piston dynamic response. The oil-film pressure and the structural deformation were approximated, respectively, by finite difference method and finite element method. Findings – The results show that the design parameters such as clearance, offset and the axial location of piston pin have a great influence on the dynamics of the piston and hence on the piston slap phenomenon and the frictional power loss. Originality/value – All the results mainly focus on the slap noise of the engine and can be used in the piston–liner development at the development of the engine.

A generative design approach for modular construction in congested urban areas

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yuxi Wei ◽  
Hyungjoo Choi ◽  
Zhen Lei
Keyword(s):  
Urban Areas ◽  
Design Method ◽  
Residential Building ◽  
Information Modeling ◽  
Design Approach ◽  
Design Parameters ◽  
Building Structures ◽  
Modular Construction ◽  
Generative Design ◽  
Content Type

PurposeModular construction is widely adopted and used in the construction industry to improve construction performance with respect to both efficiency and productivity. The evaluation of design options for modular construction can be iterative, and thus automation is required to develop design alternatives. This research aims to explore the potential of utilizing the generative design approach to automate modular construction for residential building structures in urban areas such as New York City.Design/methodology/approachThe proposed research methodology is investigated for a systematic approach to parametrize design parameters for modular construction layout design as well as incorporate design rules/parameters into modularizing design layouts in a Building Information Modeling (BIM) environment. Based on current building codes and necessary inputs by the user, the proposed approach enables providing recommendations in a generative design method and optimizes construction processes by performing analytical calculations.FindingsThe generative design has been found to be efficient in generating layout designs for modular construction based on parametric design. The integration of BIM and generative design can allow industry practitioners to fast generate design layout with evaluations from constructability perspectives.Originality/valueThis paper has proposed a new approach of incorporating generative design with BIM technologies to solve module layout generations by considering design and constructability constraints. The method can be further extended for evaluating modular construction design from manufacturability and assembly perspectives.

Development of a 3D printing method for the textile hybrid structure

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jihye Deborah Kang ◽  
Sungmin Kim
Keyword(s):  
3D Printing ◽  
Design Methodology ◽  
Hybrid Structure ◽  
Design Parameters ◽  
Support Structures ◽  
Content Type ◽  
3D Printed ◽  
Curved Panels ◽  
Practical Implications ◽  
Printing Method

PurposeThe development of a 3D printing method for the textile hybrid structure that can both be a solution to the conventional drawbacks of 3D printing method and a step forward to a garment making industry.Design/methodology/approachA novel 3D printing method using the textile hybrid structure was developed to generate 3D object without support structures.Findings3D printing of curved panels without support structure was possible by using fabric tension and residual stress.Practical implicationsGarment panels can be 3D printed without support structures by utilizing the idea of textile hybrid structure. Garment panels are expected to be modelled and printed easily using the Garment Panel Printer (GPP) software developed in this study.Social implications3D printing method developed in the study is expected to reduce the time and material previously needed for support structures.Originality/valueComprehensive preparatory experiments were made to determine the design parameters. Various experiments were designed to test the feasibility and validity of proposed method.

Pantograph-catenary contact reliability analysis under crosswind

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yong-Hua Li ◽  
Yang Cao ◽  
Yong-Xin Wu ◽  
Xiao-Ning Bai ◽  
Jia-Wei Mao
Keyword(s):  
Relative Motion ◽  
Design Methodology ◽  
Effective Length ◽  
Design Parameters ◽  
Lateral Deviation ◽  
Vector Method ◽  
Content Type ◽  
Bird Swarm Algorithm ◽  
The Relationship

PurposeThis paper aims to establish the relationship between crosswind speed and pantograph-catenary lateral deviation, as well as quantify the influence of crosswind speed and rod size uncertainty on pantograph-catenary contact reliability.Design/methodology/approachThe closed vector method is used to establish the pantograph-catenary kinematics formula. A new prediction model is proposed by using the bird swarm algorithm to optimize the grey model. The lateral deviation of the pantograph and catenary is predicted via the new model. Then the relationship between the effective length of the rod and operating mileage is inferred by combining the effective length theory with the Gamma process, as well as the pantograph-catenary contact reliability model is established according to reliability theory.FindingsThe results obtained show the impacts of uncertainty design parameters of pantograph rods on pantograph-catenary contact reliability index, and the results at crosswind speed of 0 ms−1 and 5 ms−1 are 5.0630 and 4.1442, respectively. The reliability decreases with the increasing crosswind speed, and can be greater than the reliability calculated for rod size degradation due to long-term use.Originality/valueMost preceding works on pantograph-catenary contact reliability were based on principles of dynamics, without considering the pantograph-catenary relative motion. This research reveals the law of pantograph-catenary relative motion for uncertainty design parameters and crosswind, and quantifies the reliability from the angle of kinematics.

Design parameters improvement of helicopter ducted tail rotor

2018 ◽  
Vol 90 (2) ◽  
pp. 237-245
Author(s):  
Guo Zhong ◽  
Jun Huang ◽  
Mingxu Yi
Keyword(s):  
Noise Reduction ◽  
Design Methodology ◽  
Acoustic Noise ◽  
Prediction Method ◽  
Design Parameters ◽  
Thin Body ◽  
Content Type ◽  
Acoustic Performance ◽  
Body Boundary ◽  
Practical Implications

Purpose The purpose of this paper is to reduce the acoustic noise of helicopter ducted tail rotor. Design/methodology/approach To predict the noise accurately, a thin-body boundary element method (BEM)/Ffowcs Williams–Hawkings method is developed in this paper. It is a hybrid method combining the BEM with computational aeroacoustics and can be used efficiently to predict the propagation of sound wave in the duct. Findings Compared with the experimental results, the proposed method of acoustic noise is rather desirable. Practical implications Then several geometry parameters are modified to investigate the noise reduction of ducted tail rotor by using the numerical prediction method. Originality/value The aerodynamic and acoustic performance of different modification tasks is discussed. These results demonstrate the validity of design parameters modification of ducted tail rotor in acoustic noise reduction.

Available to meet: advances in professional communications

2020 ◽  
Vol 33 (6) ◽  
pp. 1543-1553
Author(s):  
E. Burton Swanson
Keyword(s):  
Artificial Intelligence ◽  
Social Interaction ◽  
Design Methodology ◽  
Design Approach ◽  
Content Type ◽  
Social Conventions ◽  
Organizational Identities ◽  
Current Design ◽  
The Face ◽  
Industrial Strength

PurposeThis viewpoint paper calls in to question the current design approach to personal artificial intelligence (AI) assistance in support of everyday professional communications, where a bot emulates a human in this role. It aims to stimulate fresh thought among designers and users of this technology. It also calls upon scholars to more widely share incidental insights that arise in their own encounters with such new AI.Design/methodology/approachThe paper employs a case of an email exchange gone wrong to demonstrate the current failings of personal AI assistance in support of professional communications and to yield broader insights into bot design and use. The viewpoint is intended to provoke discussion.FindingsFrom the case, it is indicated that industrial-strength personal AI assistance is not here yet. Designing a personal AI assistant to emulate a human is found to be deeply problematic, in particular. The case illuminates what might be called the problem of blinded agency, in performative contexts where human, robotic and organizational identities are at least partially masked and actions, inactions and intentions can too easily disappear in a thick fog of digital exchange. The problem arises where parties must act in contexts not known to each other, and where who is responsible for what in a mundane exchange is obscured (intentionally or not) by design or by actions (or inactions) of the parties. An insight is that while humans act with a sense of agency to affect outcomes that naturally invoke a corresponding sense of responsibility for what transpires, bots in social interaction simply act and feign responsibility as they have no sense of it beyond their code and data. A personal AI assistant is probably best designed to communicate its artificiality clearly. Missing today are distinctive social conventions for identifying machine agency in everyday interactions as well as an accepted etiquette for AI deployment in these settings.Originality/valueAs a viewpoint contribution, the paper's value is as a stimulant to discussion of alternate approaches to design and use of personal AI assistance in professional communications and where we should be going with this. The presented case of an email exchange gone wrong is simple on the face of it but reveals in its examination a number of complexities and broader insights.

The influence of localized mechanical stresses on the non-homogeneous distribution of electrical conductivity

2016 ◽  
Vol 35 (6) ◽  
pp. 1983-1995 ◽  
Author(s):  
Ewa Napieralska-Juszczak ◽  
Piotr Napieralski ◽  
Krzysztof Komeza ◽  
Youcef Zeroukhi
Keyword(s):  
Electrical Conductivity ◽  
Design Methodology ◽  
Simulation Method ◽  
Uneven Distribution ◽  
Design Parameters ◽  
Homogeneous Distribution ◽  
Physical Parameters ◽  
Total Resistance ◽  
Content Type ◽  
Practical Implications

Purpose The purpose of this paper is to determine the physical design parameters that influence the total resistance of a twisted conductor (cable). One of the physical parameters characterizing this type of structures is the uneven distribution of resistivity due to hardening, which is the result of stress exerted on the wires during the manufacturing process. Design/methodology/approach The authors have developed a method to take into account the effect of localized hardening on the inhomogeneous distribution of electrical conductivity in the distorted structures of the conductor. To achieve this goal, the authors have implemented a mechanical-electrical simulation method. The resistance characteristics have been measured as a function of mechanical stress. Findings As demonstrated by the results of measurements conducted on various samples and with various cable design parameters, the resistance of a given material (copper or aluminum), expressed as a function of stress, does not depend on the type of force applied. Therefore, the same characteristics may be applied to various cable designs. Practical implications The method presented in this paper enables more detailed investigation of the influence of particular design parameters on the total resistance of a cable. It also provides the ability to determine optimal settings of design parameters. Originality/value The approach is distinct from similar studies because it takes into account the deformed geometry of the conductor and the uneven distribution of the resistivity within a filament. In the literature, it is sometimes stated that the distribution of resistivity in a compacted cable is uneven, but its measurement is deemed impossible. This paper provides a method for determining such a distribution.

Computer‐aided design and engineering as enablers of agile manufacturing

2011 ◽  
Vol 22 (3) ◽  
pp. 405-418 ◽  
Author(s):  
S. Vinodh ◽  
D. Kuttalingam
Keyword(s):  
Technology Integration ◽  
Computer Aided Design ◽  
Design Methodology ◽  
Agile Manufacturing ◽  
Content Type ◽  
Computer Aided ◽  
Manufacturing Organization ◽  
Aided Design ◽  
Practical Feasibility ◽  
Practical Implications

PurposeThe purpose of this paper is to investigate computer‐aided design (CAD) and computer‐aided engineering (CAE) as enablers of agile manufacturing (AM).Design/methodology/approachBased on the literature review, the importance of technology integration enabling AM has been found. CAD technology has been used for modelling baseline product; CAE has been used for deriving optimized parameters; new designs have been derived.FindingsThe feasibility of CAD and CAE as enablers of AM has been ensured.Research limitations/implicationsThe study has been conducted only in one automotive sprocket manufacturing organization.Practical implicationsThe practical feasibility of generating new products through technology integration has been ensured.Originality/valueVery little research has been reported on technology‐integrated AM practices. In this study, CAD and CAE have been used for enabling product development.

scholarly journals Aerodynamic performance of flying discs

2018 ◽  
Vol 90 (2) ◽  
pp. 390-397
Author(s):  
Noorfazreena Kamaruddin ◽  
Jonathan Potts ◽  
William Crowther
Keyword(s):  
Design Methodology ◽  
Aerodynamic Characteristics ◽  
Design Parameters ◽  
Flight Performance ◽  
Content Type ◽  
Six Degree Of Freedom ◽  
Design Factors ◽  
Drag Ratio ◽  
Lift To Drag Ratio ◽  
Practical Implications

Purpose The purpose of this paper is to examine geometrical design influence of various types of flying discs on their flight performance from the aerodynamics perspective. Design/methodology/approach The lift, drag and moment coefficients of the discs were measured experimentally using a wind tunnel. Three types of golf discs and four sets of simpler parametric discs were studied to analyze and isolate the effect of design factors on these aerodynamic characteristics. Full six degree-of-freedom simulations of the discs were performed to visualize their flight trajectories and attitudes. These simulations, combined with the experimental data, provide details on the well-known “S-shaped” ground-path traced by a flying disc. Findings This paper reveals two key parameters to evaluate the flight performance of a disc: its coefficient of lift-to-drag ratio (CL/CD) and, more importantly, its coefficient of pitching moment (CM). The latter influences the tendency of the disc to yaw from its intended path, and the former influences its throwing distance. Practical implications The work suggests that to optimize the flight performance of a disc, the magnitudes and gradient of its CM should be minimized and its trim-point shifted from origin, while its CL/CD should be maximized with a flatter peak. Originality/value In this paper, the design parameters and the aerodynamic characteristics of various types of flying discs are analysed, compared and discussed in depth. Recommendations of design improvements to enhance the performance of any flying disc are offered as well.

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