scholarly journals The Influence of Timing in Exploratory Prototyping and Other Activities in Design Projects

2013 ◽  
Author(s):  
Anders Häggman ◽  
Tomonori Honda ◽  
Maria C. Yang
Keyword(s):  
Graduate Students ◽  
Design Process ◽  
Early Stage ◽  
User Interaction ◽  
Preliminary Design ◽  
Design Phase ◽  
Design Activities ◽  
Design Projects

The importance of prototyping in the design process has been widely recognized, but less research emphasis has been placed on the appropriate timing and detail of so-called “throwaway” prototyping during the preliminary design phase. Based on a study of mid-career professional graduate students, statistically significant correlations were found between the time such prototypes were created and design outcome. Building prototypes early on in the design process, or performing additional rounds of benchmarking and user interaction later on during the project (in addition to the typical early stage efforts), correlated with better design outcome, although the total time spent on these activities did not. The correlation between project presentations and reviewer scores are also touched upon. These findings suggest that the timing of design activities is more important than the time spent on them.

Computers in building design

1988 ◽  
Vol 15 (4) ◽  
pp. 673-678
Author(s):  
Claude Bédard
Keyword(s):  
Key Words ◽  
Design Process ◽  
Building Design ◽  
Design Team ◽  
Preliminary Design ◽  
Design Activities ◽  
Design Projects ◽  
Design Integration ◽  
The Way

The process of designing buildings presents characteristics that set it apart from the design process in other engineering fields. Traditionally, computers have been assigned the number-crunching and bookkeeping tasks in building design activities. Also, few participants in the design team have used computers on a regular basis. However, many changes are taking place which will affect the way a building design is carried out and the contribution computers could make in the process. All factors appear to advocate greater use of computers to achieve better designs. Three active areas of development are finally presented to illustrate new roles computers could assume in future building design projects. Key words: building design process, algorithm, synthesis/analysis, preliminary design, integration.

Simulation-Supported Early Stage Design Optimisation for a Case Study of Life Cycle Oriented Buildings

2019 ◽  
Vol 887 ◽  
pp. 353-360 ◽  
Author(s):  
Sören Eikemeier ◽  
Ardeshir Mahdavi ◽  
Robert Wimmer
Keyword(s):  
Life Cycle ◽  
Architectural Design ◽  
Early Stage ◽  
Preliminary Design ◽  
Design Phase ◽  
Design Optimisation ◽  
Stage Design ◽  
Simulation Based ◽  
Early Stage Design

To reduce the energy and resource consumption in the building sector this study is focusing on a design optimisation of life cycle oriented buildings. In order to optimise the performance of the buildings and in consequence also to achieve improved results for the mandatory Austrian energy certificate a simulation-based rapid design approach is used for the early stage design phase of the buildings, in particular for the architectural design of the buildings.Methods like the Window to Wall Ratio, at the very beginning of the design process, a parametric simulation with EnergyPlus or a more detailed optimisation approach with GenOpt are integrated in this study applied to example buildings. The results are showing that the method can be used in a circular approach for improving the heating demand of the Austrian energy certificate for this case study by more than 25 % compared to the preliminary design

Automated Thermal and Stress Preliminary Analyses Applied to a Turbine Rotor

2016 ◽  
Author(s):  
Maxime Moret ◽  
Alexandre Delecourt ◽  
Hany Moustapha ◽  
Francois Garnier ◽  
Acher-Igal Abenhaim
Keyword(s):  
Design Process ◽  
Turbine Rotor ◽  
Tip Clearance ◽  
Conceptual System ◽  
Preliminary Design ◽  
Design Phase ◽  
Detailed Design ◽  
Turbine Engine ◽  
Cad Models ◽  
The Impact

The use of Multidisciplinary Design Optimization (MDO) techniques at the preliminary design phase (PMDO) of a gas turbine engine allows investing more effort at the pre-detailed phase in order to prevent the selection of an unsatisfactory concept early in the design process. Considering the impact of the turbine tip clearance on an engine’s efficiency, an accurate tool to predict the tip gap is a mandatory step towards the implementation of a full PMDO system for the turbine design. Tip clearance calculation is a good candidate for PMDO technique implementation considering that it implies various analyses conducted on both the rotor and stator. As a first step to the development of such tip clearance calculator satisfying PMDO principles, the present work explores the automation feasibility of the whole analysis phase of a turbine rotor preliminary design process and the potential increase in the accuracy of results and time gains. The proposed conceptual system integrates a thermal boundary conditions automated calculator and interacts with a simplified air system generator and with several conception tools based on parameterized CAD models. Great improvements were found when comparing this work’s analysis results with regular pre-detailed level tools, as they revealed to be close to the one generated by the detailed design tools used as target. Moreover, this design process revealed to be faster than a common preliminary design phase while leading to a reduction of time spent at the detailed design phase. By requiring fewer user inputs, this system decreases the risk of human errors while entirely leaving the important decisions to the designer.

scholarly journals Representation in Early Stage Design: An Analysis of the Influence of Sketching and Prototyping in Design Projects

2012 ◽  
Author(s):  
Catherine Elsen ◽  
Anders Häggman ◽  
Tomonori Honda ◽  
Maria C. Yang
Keyword(s):  
Design Process ◽  
Early Stage ◽  
Design Tools ◽  
Quality Of Information ◽  
Stage Design ◽  
Design Concepts ◽  
Design Projects ◽  
Early Stage Design ◽  
Team Design

Sketching and prototyping of design concepts have long been valued as tools to support productive early stage design. This study investigates previous findings about the interplay between the use and timing of use of such design tools. This study evaluates such tools in the context of team design projects. General trends and statistically significant results about “sketchstorming” and prototyping suggest that, in certain constrained contexts, the focus should be on the quality of information rather than on the quantity of information generated, and that prototyping should begin as soon as possible during the design process. Ramifications of these findings are discussed in the context of educating future designers on the efficient use of design tools.

scholarly journals Decomposition-Based Assembly Synthesis for In-Process Dimensional Adjustability

2002 ◽  
Author(s):  
Byungwoo Lee ◽  
Kazuhiro Saitou
Keyword(s):  
Design Process ◽  
Early Stage ◽  
Product Configuration ◽  
Two Dimensional ◽  
Design Phase ◽  
Assembly Design ◽  
Component Design ◽  
Assembly Sequences ◽  
Simple Rules ◽  
Final Design

This paper presents a method of assembly synthesis focused on the in-process adjustability, where assembly synthesis is defined as the decomposition of the end product design prior to the detailed component design phase. Focusing on the effect of joint configurations on dimensional integrity of complex assemblies, the method recursively decomposes a product configuration and assigns joint configurations according to simple rules, in order to achieve a designed dimensional adjustability and non-forced fit. The rules employed during the decomposition process are drawn from the previous works of assembly design. An augmented AND/OR graph is utilized to represent a process of assembly synthesis with the corresponding assembly sequences, and the algorithm for generating the AND/OR graph is discussed. The method is applied to two dimensional skeletons of product designs at very early stage of the design process. The relation of the assembly synthesis to Datum Flow Chain (Mantripragada and Whitney, 1998) is discussed. It is also shown that each final design from the assembly synthesis defines its own Datum Flow Chain.

scholarly journals Development of an AI Userbot for Engineering Design Education Using an Intent and Flow Combined Framework

2020 ◽  
Vol 10 (22) ◽  
pp. 7970
Author(s):  
Yu-Hung Chien ◽  
Chun-Kai Yao
Keyword(s):  
Engineering Design ◽  
System Architecture ◽  
Design Education ◽  
Early Stage ◽  
Design Practice ◽  
Structured Interviews ◽  
Engineering Design Education ◽  
Design Activities ◽  
Design Projects ◽  
Virtual Product

As the inclusion of users in the design process receives greater attention, designers need to not only understand users, but also further cooperate with them. Therefore, engineering design education should also follow this trend, in order to enhance students’ ability to communicate and cooperate with users in the design practice. However, it is difficult to find users on teaching sites to cooperate with students because of time and budgetary constraints. With the development of artificial intelligence (AI) technology in recent years, chatbots may be the solution to finding specific users to participate in teaching. This study used Dialogflow and Google Assistant to build a system architecture, and applied methods of persona and semi-structured interviews to develop AI virtual product users. The system has a compound dialog mode (combining intent- and flow-based dialog modes), with which multiple chatbots can cooperate with students in the form of oral dialog. After four college students interacted with AI userbots, it was proven that this system can effectively participate in student design activities in the early stage of design. In the future, more AI userbots could be developed based on this system, according to different engineering design projects for engineering design teaching.

scholarly journals Decomposition-Based Assembly Synthesis for In-Process Dimensional Adjustability

2003 ◽  
Vol 125 (3) ◽  
pp. 464-473 ◽  
Author(s):  
Byungwoo Lee ◽  
Kazuhiro Saitou
Keyword(s):  
Design Process ◽  
Early Stage ◽  
Product Configuration ◽  
Two Dimensional ◽  
Design Phase ◽  
Assembly Design ◽  
Component Design ◽  
Assembly Sequences ◽  
Simple Rules ◽  
Final Design

This paper presents a method of assembly synthesis focused on the in-process adjustability, where assembly synthesis is defined as the decomposition of the end product design prior to the detailed component design phase. Focusing on the effect of joint configurations on dimensional integrity of complex assemblies, the method recursively decomposes a product configuration and assigns joint configurations according to simple rules, in order to achieve a designed dimensional adjustability and non-forced fit. The rules employed during the decomposition process are drawn from the previous works of assembly design. An augmented AND/OR graph is utilized to represent a process of assembly synthesis with the corresponding assembly sequences, and the algorithm for generating the AND/OR graph is discussed. The method is applied to two dimensional skeletons of products without moving parts at very early stage of the design process. The relation of the assembly synthesis to Datum Flow Chain [1] is discussed. It is also shown that each final design from the assembly synthesis defines its own Datum Flow Chain.

Integration of Crashworthiness Aspects into Preliminary Aircraft Design

2014 ◽  
Vol 598 ◽  
pp. 146-150 ◽  
Author(s):  
Dominik B. Schwinn
Keyword(s):  
Design Process ◽  
Aircraft Design ◽  
Analysis Tool ◽  
Preliminary Design ◽  
Design Phase ◽  
Crash Analysis ◽  
Early Design ◽  
Preliminary Aircraft Design ◽  
Early Design Stages ◽  
Certification Requirement

Crashworthiness proof is a certification requirement by aviation authorities for new aircraft types. The objective of static design is a sufficiently stiff and strong structure to carry bending and torsion during flight and ground maneuvers. High stiffness, however, is critical for good crashworthiness behavior. Therefore, crashworthiness investigations should be included at early design stages of the overall aircraft design process. This paper introduces the crash analysis tool AC-CRASH and shows an approach of integrating it into the preliminary design phase.

CFD-Integrated in Preliminary Design of Unmanned Helicopter

2012 ◽  
Author(s):  
Artit Ridluan ◽  
Attapon Charoenpon ◽  
Achirakris Julniphitwong ◽  
Kasama Thaworn
Keyword(s):  
Design Process ◽  
Early Stage ◽  
Preliminary Design ◽  
Blade Design ◽  
Efficient Design ◽  
Design And Optimization ◽  
Overall Design ◽  
Design Cycle ◽  
Twisted Blade ◽  
Nonlinear Behaviors

In helicopter performance design and optimization, aerodynamics is the primary area. Therefore to achieve the required helicopter performance to accomplish the missions, the efficient design process in preliminary design phase is crucial. In a past, the preliminary design involved the simplified equations to account for the aerodynamic behavior of a rotorcraft, resulting in the loss of aerodynamic phenomena such as turbulence and vortex flow pattern, which contribute to the nonlinear behaviors. In order to improve overall design process, we thus propose the preliminary design process without the iteration. The proposed preliminary design applied the recent blade design theories with CFD procedure integrated in the preliminary design. The main benefit of this new methodology is to access the detailed flow physics as quick as possible, thus allowing the designer to faster analyze and improve the performance of the helicopter in early stage of design process. Based on the design results given by the proposed preliminary design methodology, the new blade design was configurationally changed. The redesigned blade was twisted configuration with ∼9 and ∼27 degrees at the cone at the tip and cone, respectively. The computational results showed that the twisted blade increased the lift by approximately 846% relative to the fist design. In addition, the design cycle can be completed in only one cycle and the design time spent is few days.

State-of-the-Art Combustor Design Utilizing the Preliminary Combustor Design System PRECODES

2008 ◽  
Author(s):  
Nima Pegemanyfar ◽  
Michael Pfitzner
Keyword(s):  
Combustion Chamber ◽  
Design Process ◽  
State Of The Art ◽  
Design System ◽  
Preliminary Design ◽  
Residence Times ◽  
Design Phase ◽  
Post Processing ◽  
Design Rules ◽  
Chamber Design

Advanced state-of-the-art gas turbine combustion chamber design requires a multitude of design rules and parameters using a large number of empirical correlations. In order to allow for a more effective use of this knowledge, the preliminary combustor design system PRECODES was developed in the framework of the European research project INTELLECT D.M. (INTEgrated Lean Low Emission CombusTor Design Methodology). The development of PRECODES has already been described by the authors in previous ASME papers [1], [2]. This paper is focused on the results achieved by the application of the system and the demonstration of its potential regarding an automated combustion chamber design. Since the preliminary design of the combustor is performed and optimized fully automatically by the system, the evaluation and comparison of a much higher number of combustor configurations is possible compared to using a manual design process. Moreover detailed CFD analysis is no more limited to the final design phase, but can now be performed early during the preliminary design phase. The CFD results allow for a detailed postprocessing, to check whether all requirements, as derived from the design rules by correlations are satisfied by the configuration (e.g. zonal air/fuel ratios, residence times). The iterative combustor design process loop, as described by the authors in the previous papers [1], [2] has been closed. New, improved combustor design rules have been derived providing a sophisticated combustor design. Different preliminary combustor configurations are produced by the system on the basis of varying performance parameters and geometric requirements, resulting in a variation of the combustor volume, mixing holes sizes and application of different types of mixing holes required to meet the zonal stoichiometries. Some of the configurations have been analysed and compared more specifically using the detailed post-processing capability. An overview of this detailed post-processing analysis and of the data comparison is given in the paper. A promising configuration has been obtained with respect to NOx and CO emissions, at the same time ensuring sufficient residence times for both relight and combustion efficiency requirements.

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