الفهرس 
Wood as a Programmable Material
. Generative Shape Shifting Facade GrammarsOnly 14 pages are availabe for public view
 |  | from | 169 |  |  |
| | | from | 169 | | |
Abstract
Abstract
Typical motion mechanisms in adaptive skins compromise rigid kinematic mechanical systems with sensors, processors, and actuation devices, thus impeding the adoption of zero-energy buildings. This study is developing responsive low-cost adaptive building system that exploits latent properties of programmable materials, to passively respond to external stimulus. Composite programmable material “Hygromorphic Thermo-bimetals” HMTM is proposed to respond to different weather conditions, specifically Egypt. HMTM composite bilayer material is based on controlling both hygroscopic properties of wood that responds to variation in humidity and the difference in thermal coefficient of metals according to the variation in temperature. HMTM passive motion mechanism is presented as a programmable system whose bilayer motion logic is controlled through the variation in both temperature and humidity. The significance of HMTM composite is utilizing its infinite motion responses resulting from the hygroscopic properties of wood but is passively stimulated by the expansion of metal layer as the variation in temperature is the dominant factor in Egypt.
Despite efforts to develop working prototypes using several programmable materials, there is still no clear methodological framework for understanding and controlling the behaviour of these materials for using them for adaptive purposes. The study proposes a generative computational approach to track, analyse and program the HMTM motion response as a shape shifting grammar. The study presents a method to link between the material tangible interface in a sealed environmental chamber and digital interface that has image analysis software “Kinovea” that captures and analyses the material motion and its angle of curvature, and digital simulation using Grasshopper plugin and Ladybug to study the effect of HMTM motion responses on achieving different percentage of opening and shadow configurations in Cairo, Egypt. Shape and motion formal language grammars are used as a base to propose a generative computational approach for shape shifting materials specifically for HMTM to encode the effect of HMTM design parameters on the desired motion response.