Concurrent Designing of Airframes: State of the Art and Trends

1994 ◽  
Author(s):  
Christian Petiau
Keyword(s):  
Concurrent Engineering ◽  
Design Methodology ◽  
Mathematical Optimization ◽  
Multidisciplinary Optimization ◽  
Design History ◽  
Future Evolution ◽  
Whole Process ◽  
Engineering Organizations ◽  
Final Design ◽  
Parametric Cad

Abstract We will first recall that the organization of airframe designing stands in direct relation to the performance capabilities of available tools, which is, in fact, what determines the number and the nature of project iterations. We then present and analyze an organization type which can nowadays be recommended in view of the currently available CAD, computation and mathematical optimization means. This leads to a first design which is followed by experimental verification, with a key role for flight tests. The final design is checked with the aid of computation models that have been calibrated with the results of the performed tests. We will then examine new tools, since they are factors in the future evolution of the design methodology, including: • availability of the “design history”, as a set of all data of the whole process, • structure optimization with parametric CAD and multidisciplinary optimization • “feature” modeling • enhancement of the computation methods As a conclusion, we show that significant gains in terms of productivity and quality can be expected from these new products, both at design and at production level. What remains, however, to be found, are the most appropriate concurrent engineering organizations that are best suited to these new tools.

Constructive Optimisation of the Propeller Type Mixing Devices Using the Virtual and Rapid Prototyping

2017 ◽  
Vol 68 (3) ◽  
pp. 453-458 ◽  
Author(s):  
Daniel Besnea ◽  
Alina Spanu ◽  
Iuliana Marlena Prodea ◽  
Gheorghita Tomescu ◽  
Iolanda Constanta Panait
Keyword(s):  
Rapid Prototyping ◽  
Low Cost ◽  
Scale Up ◽  
Three Dimensional ◽  
Rapid Identification ◽  
Multidisciplinary Optimization ◽  
External Diameter ◽  
Process Industries ◽  
Parametric Cad ◽  
Shaft Torque

The paper points out the advantages of rapid prototyping for improving the performances/constructive optimization of mixing devices used in process industries, here exemplified to propeller types ones. The multidisciplinary optimization of the propeller profile affords its design using parametric CAD methods. Starting from the mathematical curve equations proposed for the blade profile, it was determined its three-dimensional virtual model. The challenge has been focused on the variation of propeller pitch and external diameter. Three dimensional ranges were manufactured using the additive manufacturing process with Marker Boot 3D printer. The mixing performances were tested on the mixing equipment measuring the minimum rotational speed and the correspondent shaft torque for complete suspension achieved for each of the three models. The virtual and rapid prototyping method is newly proposed by the authors to obtain the basic data for scale up of the mixing systems, in the case of flexible production (of low quantities), in which both the nature and concentration of the constituents in the final product varies often. It is an efficient and low cost method for the rapid identification of the optimal mixing device configuration, which contributes to the costs reduction and to the growing of the output.

Segmenting, targeting and positioning in Islamic marketing

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mohammad Mominul Islam
Keyword(s):  
Content Analysis ◽  
Design Methodology ◽  
Secondary Data ◽  
Qualitative Approach ◽  
Content Type ◽  
Social Fabric ◽  
Shape Segmentation ◽  
Whole Process ◽  
The Social ◽  
Practical Implications

Purpose This study aims to conceptualize the basic Islamic marketing (IM) process according to Shari’ah, addressing some of the queries raised by scholars on halal and marketing. Design/methodology/approach A qualitative approach and content analysis have guided to shape segmentation, targeting and positioning (STP) with the help of secondary data from conventional and IM. Required Qur’anic verses and hadiths have been galvanized to shape STP in line with empirical evidence, showing potential marketing implications. Findings This study has accepted Islamic resources to segment markets, mentioning mankind, non-Muslims, Muslims, generic, halal and Islamic products. It has proposed to target mankind, non-Muslims markets with generic and halal products. Muslim marketers can target the pious Muslim consumers with Islamic products. For positioning, the halal certification has been suggested for the non-Muslim marketers and Islamization is for Muslim marketers. The whole process has been conceptualized in a single framework. Practical implications Marketers can have many product development ideas and basic guidelines and scholars may be able to sense some queries as to IM. Social implications This study has shown how inter-religious relationships can be harmonized with carrying out marketing functions to keep the social fabric following the Qur’anic verses. Originality/value This study has outlined the IM process as per Muslim and non-Muslim marketers’ needs under Shari’ah. Besides, it has answered some questions on halal and IM that has been hardly addressed before.

Brazil: between the modern bureaucracy of Weber and resilient patrimonialism

2015 ◽  
Vol 13 (2) ◽  
pp. 140-159 ◽  
Author(s):  
José Antonio Gomes de Pinho ◽  
Ana Rita Silva Sacramento
Keyword(s):  
Content Analysis ◽  
Public Administration ◽  
Design Methodology ◽  
Max Weber ◽  
Content Type ◽  
Social Foundations ◽  
Whole Process ◽  
Brazilian State ◽  
State Apparatus ◽  
Legal Model

Purpose – The purpose of this study is to identify factors that approach and that separate the Brazilian bureaucracy from the model advocated by Max Weber. Efforts were concentrated on the discussion of aspects of historical and social foundations of society and the Brazilian state that influence its bureaucracy and in the reforms undertaken in the state apparatus. The authors selected some of its iconic moments, within the framework of patrimonialism, seeking to identify evidence of its influence in Brazilian public administration. Design/methodology/approach – This study is qualitative and has interpretative background with descriptive purposes. The whole process of research was based on the literature. The interpretation of data relied on content analysis based on Bardin. Findings – The study reveals that the prevailing bureaucratic model in Brazil, although it contains some characteristics of rational-legal model, is not yet produced the expected disenchantment, at least in public administration. In addition, it was noted that the patrimonialism bases, in which society and the Brazilian State still rely, seems to prevent the bureaucracy that was advocated by Max Weber from installing fully. Originality/value – Studies dealing with bureaucracy in the context of public administration are still welcome and necessary in Brazil. This is because this country still does not admit the bureaucracy to function according to the model advocated by Max Weber.

The Downstream Digital Mock-Up: A New Concept to Support Virtual Reality Applications in the Aeronautic Industry

2004 ◽  
Author(s):  
G. Drieux ◽  
J.-C. Le´on ◽  
N. Chevassus ◽  
F. Guillaume
Keyword(s):  
Virtual Reality ◽  
Product Development ◽  
Concurrent Engineering ◽  
Development Process ◽  
Numerical Models ◽  
The Other ◽  
Product Development Process ◽  
Design Decision ◽  
Engineering Organizations ◽  
Development Phases

The Digital Mock-Up (DMU), which is a comprehensive numerical model describing the final manufactured product, is today widely used in the industry (like the automotive and aeronautic industries) to support the concurrent engineering organizations and processes. On the other hand, simulation helps in the development of a product for design decision making or validation purposes. It allows to determine, with the appropriate level of accuracy, the behavior of the future product under a specific environment or set of exterior actions. Virtual Reality (VR) applications are simulations where the focus is on immersion and interaction with the product. However, there is still lacks in the integration of simulation within the product development phases. In particular the link between the DMU and the numerical models for simulation in the large is often hardly achieved. For some types of simulation, it is even inexistent. In this paper, we propose a new object, the Downstream Digital Mock-Up (DDMU), based on a polyhedral representation, and we show that it can be a support for the integration of a subset of simulation activities within the product development process by making the link between the DMU and these simulations. In the particular case of VR, we show that this object is particularly adapted. One particularity of the DDMU is to be prepared for a specific target application, defined by its objectives and the context in which it is immersed.

scholarly journals Tangible Remains

2021 ◽  
Author(s):  
◽  
Solange Marie Lochore Thorp
Keyword(s):  
Urban Development ◽  
Design Methodology ◽  
Present Condition ◽  
Future Projection ◽  
The Future ◽  
Final Design ◽  
Additive Design ◽  
Art School

<p>This design led research advocates for an architecture indicative of the preceding history; that engages in an active dialogue with the site. Developed through shifting scales and media, the thesis investigates how architecture can give expression to the singularities of site. The milieu of erasures and the enduring traces are drawn to the surface and manifested across three design phases: 1 Chinese Garden, present condition; 2 Art School, past reflection; 3 Artist Colony, future projection. Through a process of editing, fragments are extended and retracted between the phases as more intense programs are introduced. The final design outcome is the result of an additive design methodology, developed across the course of the thesis. The design methodology is a model for combining sites in contemporary urban development; a model for co-existence of past and present into the future.</p>

scholarly journals Optimal re-allocation of mooring areas for yachts

2019 ◽  
Vol 4 (1) ◽  
pp. 94-105
Author(s):  
Shuaian Wang ◽  
Ran Yan ◽  
Lingxiao Wu ◽  
Dong Yang
Keyword(s):  
Optimization Model ◽  
Numerical Experiments ◽  
Design Methodology ◽  
Mathematical Optimization ◽  
Content Type ◽  
Integer Programing ◽  
Proposed Model ◽  
Quantitative Manner ◽  
Mathematical Optimization Model ◽  
The Government

Purpose The purpose of this study is to propose a mathematical optimization model to solve the yacht mooring area re-allocation problem (YMARP). The objective of the problem is to allow the maximum number of yachts to be moored at their ideal mooring areas. Design/methodology/approach In this paper, the YMARP is introduced, formally defined and discussed. The authors develop a 0-1 integer programing optimization model for the problem, which can be solved efficiently using off-shelf solvers. The performance of the model is tested on extensive numerical experiments. Findings The results of the numerical experiments demonstrate that the proposed model can solve the YMARP very efficiently using off-shelf solvers like CPLEX. In particular, problems with up to 30,000 yachts and 400 mooring areas can be solved to optimum within 30 s. Originality/value This study is one of the preliminary studies to consider problems arising in yacht management in a quantitative manner. The proposed model has three main merits. First, it enables the government to better manage yachts and mooring areas. Second, with more yacht owners assigned with ideal mooring areas, the model helps reduce the traveling time of the yacht owners to yacht mooring areas. Third, by reducing the traveling time of the yacht owners, the model contributes to lessening the traffic burden in cities.

Development of a Changeable Airfoil Optimization Model for Use in the Multidisciplinary Design of Unmanned Aerial Vehicles

2009 ◽  
Author(s):  
Scott Ferguson ◽  
Andrew H. Tilstra ◽  
Carolyn C. Seepersad ◽  
Kristin L. Wood
Keyword(s):  
Optimization Problem ◽  
Design Research ◽  
Optimization Problems ◽  
Mathematical Optimization ◽  
Operating Conditions ◽  
Multidisciplinary Optimization ◽  
System Level ◽  
Airfoil Optimization ◽  
Design Variables ◽  
Subsystem Design

Complex systems need to perform in a variety of functional states and under varying operating conditions. Therefore, it is important to manage the different values of design variables associated with the operating states for each subsystem. The research presented in this paper uses multidisciplinary optimization (MDO) and changeable systems methods together in the design of a reconfigurable Unmanned Aerial Vehicle (UAV). MDO is a useful approach for designing a system that is composed of distinct disciplinary subsystems by managing the design variable coupling between the subsystem and system level optimization problems. Changeable design research addresses how changes in the physical configuration of products and systems can better meet distinct needs of different operating states. As a step towards the development of a realistic reconfigurable UAV optimization problem, this paper focuses on the performance advantage of using a changeable airfoil subsystem. Design principles from transformational design methods are used to develop concepts that determine how the design variables are allowed to change in the mathematical optimization problem. The performance of two changeable airfoil concepts is compared to a fixed airfoil design over two different missions that are defined by a sequence of mission segments. Determining the configurations of the static and changeable airfoils is accomplished using a genetic algorithm. Results from this study show that aircraft with changeable airfoils attain increased performance, and that the manner by which the system transforms is significant. For this reason, the changeable airfoil optimization developed in this paper is ready to be integrated into a complete MDO problem for the design of a reconfigurable UAV.

Technological unemployment as frictional unemployment

Kybernetes ◽  
2018 ◽  
Vol 47 (2) ◽  
pp. 333-342 ◽  
Author(s):  
Federico Fiorelli
Keyword(s):  
Unemployment Rate ◽  
Knowledge Economy ◽  
Digital Technology ◽  
Design Methodology ◽  
Digital Technologies ◽  
Historical Evolution ◽  
Content Type ◽  
Future Evolution ◽  
Technological Unemployment ◽  
The Relationship

Purpose The purpose of this paper is to present some scenarios about a possible future evolution of the labour market in the knowledge economy. Design/methodology/approach The author used the literature to describe the historical evolution of the technology unemployment. Findings Digital technology does not directly generate unemployment, as the balance between jobs destroyed and created has historically always been positive. Indeed, technological unemployment in such a context can manifest itself in the form of frictional unemployment. Originality/value The study enriches the literature on the relationship between digital technologies and unemployment rate.

Tangible Remains

2021 ◽  
Author(s):  
◽  
Solange Marie Lochore Thorp
Keyword(s):  
Urban Development ◽  
Design Methodology ◽  
Present Condition ◽  
Future Projection ◽  
The Future ◽  
Final Design ◽  
Additive Design ◽  
Art School

<p>This design led research advocates for an architecture indicative of the preceding history; that engages in an active dialogue with the site. Developed through shifting scales and media, the thesis investigates how architecture can give expression to the singularities of site. The milieu of erasures and the enduring traces are drawn to the surface and manifested across three design phases: 1 Chinese Garden, present condition; 2 Art School, past reflection; 3 Artist Colony, future projection. Through a process of editing, fragments are extended and retracted between the phases as more intense programs are introduced. The final design outcome is the result of an additive design methodology, developed across the course of the thesis. The design methodology is a model for combining sites in contemporary urban development; a model for co-existence of past and present into the future.</p>

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