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Mechanism Research
In this research, the properties of the mechanism in the 2D cross section of 3D Adaptable Building Skin were investigated. First of all, a translation of the real material and element behavior and properties of the 2D cross section was made for a numerical simulation model. The balloons were for example translated as 2D bars. It was nessesary to simplify material properties and structural behavior of several elements. Other assumptions are based on understanding of expecting behavior and results in the calculations. By patch tests to test the elements and geometry properties in the numerical model, several properties of the mechanism in the 2D cross section and its geometry were known.
After the built of the numerical model, a exploring reserach was done to the properties of the mechanism in teh cross section by using a representative external static wind load. The mechanism is characterized by two parameters; the springs at the ends fixed at the steel cables and the balloon bars. The properties of the mechanism was determined by varrying the stiffness' of these two parameters. To explore the properties of the geometry, at turn one of the parameters was put in the model as very stiff and the other one varied in stiffness. This way the conditions of the behavior and boundary conditions of the mechanism became clear.
After the exploring research, an area boundary conditions, related structural demands of the mechanism, could be determined. The boundaries are assumptions about the deformation of the cross section, tension forces in the cables and compression forces in the bars. The, in the hypothesis, assumpted materials and dimensions related to the assumed forces and area of boundary conditions. The boundaries were translated to a local area of values of stiffness' of the springs and bars. The boundary conditions were sharpened step by step by analysing the outcoming results of the simulations, plot them in graphs and relate them to the wished results related to the materials and dimensions. At the end the mechanism could be determined for the right stiffness', materials and dimensions and the determined mechanism was investigated for structural behavior.
Now that the properties of the mechanism and the ideal stiffness' are known, research was done to the principle of manipulable deformation. These deformations are manipulated by an extra woven cable in the original woven pattern of the 2D cross section. By pulling the extra cable outwards at both ends, the cross section deforms upwards or downwards. The research in the same model with the determined stiffness' and the extra cable is also modeled as a sliding cable. By numerical simulations the behavior of the manipulable deformation could be analysed and determined.
Two small experimental researches were done on the compression behavior of a balloon and the friction between the cables and the leading pipes. These researches were done to make the assumptions in the numerical simulations more reliable. A student Maarten Braem did the part with the friction as a master project. The value and behavior of friction were determined in the geometry of the 2D cross section. The conclusions have a direct relationship with the resulting tension forces in the cables of the simulations. The results also gave more information and understanding for future research.
The other exploring research was done on the compression resistance of a cylindrical balloon. The measured deflections of the leading pipes, depending on the internal pressure and the load, were translated to a vertical displacement. By pretending the cylindrical balloon worked as a 2D compressed bar, the measurement could be translated to a fictive stiffness' of the bar or balloon. Afterwards this stiffness' could be compared with the determined stiffness of the bars used in the simulations of the mechanism research.
Eventually the results and analyses from the numerical calculations were put together with the experimental tests to proof if the cross section of 3D Adaptable Building Skin has the behavior as was assumed in the design. Also more understanding was learned for further experimental research.
Graduation Project (03/07)
Master Projects:
Human Tissue Inc. (11/05)
Passages (03/05)
Twisted Life (06/04)
Swim Stadium(03/04)
ToyHouse (11/03)
Other Projects:
Relax and Meet (03/07)
Spinning Views (04/06)
Beer Crate Bridge (06/05)