Si #4 : Benachir Medjdoub

Vendredi 28 novembre 2014

(coord. François Guéna)

Séminaire international  / Séance du Vendredi 28 novembre après-midi

The presentation will introduce two research projects:

2D parametric sketching in architecture: An unusually simple interface makes this system particularly interactive and easy to use. In this system, the geometry types supported are: points, lines, circles, ellipses, circular arcs and b-spline curves. All the fundamental topological constraints, i.e. tangent, parallel, perpendicular, coincident and concentric, are provided. Metric constraints, i.e. dividing the shapes into equal parts or fixing the geometric parameters, are also provided. These constraints are automatically applied by the application in response to the implied intentions of the end-user. Dynamic modifications of partially dimensioned models are supported, whereby the design is modified while enforcing the constraints. A graph-constructive approach is used to solve the model. As we are dealing with partial modifications, this resolution technique is quite sufficient, and makes the system stable and flexible. This approach focuses highly on interactivity. Posit!
Zoning a shape constrained to another is made directly through the graphic interface. Constraint relaxation is also done by direct manipulations. Modifications are made by dragging the geometry, or by typing into a numerical panel displaying the free shape parameters. Again, existing constraints are maintained as those numbers are applied.

3D Generative design: The research aims to automated the building services of a building and more particularly the fan coil systems. The project deals with 3D complex geometry and has adopted an hybrid approach combining Case-Based Reasoning and constraint-based techniques. Very often, design engineers use previous solutions and adapt them to new problems. Case-Based Reasoning mirrors this practical approach and did help us to deal effectively with increasingly complex geometry. Our approach combines automation and interactivity. From the 3D specification of the building, our software prototype proceeds through two main steps. First the zone fan coil and diffuser arrangements are generated, using case-based reasoning approach with the benefit of using previous solutions and adapt them to the new problem and the possibility to solve large building models. The second step generates the distribution routes, using constraint programming technique, which has shown its robustness !
to solve combinatorial problems. The 3D fan coil solution can be modified or improved by the designer, when we are providing further contribution by concentrating on interactivity.


Benachir Medjdoub (DipArch, MSc, PhD) is Professor of Digital Architectural Design and Director of the Creative & Virtual technologies Lab at Nottingham Trent University (UK). Benachir is a qualified architect with several years experience in practice. Benachir holds a master degree in building sciences and a PhD in Digital Architectural design. His PhD thesis explored the potential for using optimisation techniques and constraint programming, as an aid to automate and optimise space planning in architectural design project. He has previously held research and academic positions at Ecole Centrale de Paris, the University of Cambridge, the University of Nottingham and The University of Salford. Benachir has secured several research grants funded by the Engineering and Physical Sciences Research Council in the UK and by industry.
Benachir’s expertise includes the development and the use of advanced digital media technologies in architectural and urban design from understanding the human intelligence involved in the design process in order to enhance the quality of our built environment. Over the years, Benachir has published more than 50 papers in the field of digital design.


Pour se préparer à l’écoute, 3 textes à télécharger :


Separating_topologyB. Medjdoub, B. Yannoub, Separating topology and geometry in space planning, in Computer-Aided Design 32 (2000) 39–61

Constraint-basedMedjdoub B (2009) Constraint-based adaptation for complex space configuration in building services, ITcon Vol. 14, Special Issue Building Information Modeling Applications, Challenges and Future Directions , pg. 724-735


Archi_IngeneeringBenachir Medjdoub & Mokhtaria Benzohra Chenini (2013): A constraint-based parametric model to support building services design exploration, Architectural Engineering and Design Management, DOI: 10.1080/17452007.2013.834812

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