Reviewing Design References with Diagrams： A Metropolitan Performance Assessment Perspective

The announcement of major sporting events scheduled to take place in Rio de Janeiro in the coming years is now producing several radical urban transformations that are attracting the attention of renowned architects of the international circuit. All this is happening in a city where relevant architectural references have not been produced for a long while because of the prolonged economic crisis of the past. Despite these conditions, people were able to detect “invisible” design lessons to be learned in this city by sharing perceptual experiences with foreign observers who are, by definition, unaware of their preconceptions. This paper deals with the development of a strategy for re-presenting design references that are locally rooted and accessible for direct embodied experience. The strategy put forward a MPI （metropolitan performance index） drawn out from a bibliographical survey coupled with analytical spatial diagrams of different case-studies presented as a tour guide for the recognition of the architecture produced in Rio de Janeiro. It is believed that this strategy can favor the adoption of an eye attuned to contemporary theories especially interested in the spatial and programmatic concerns that today instigate the designer.

Oscillating Body Design for A 3-DOF Wave Energy Converter

Ocean wave energy converters(WECs) are obtaining more and more attentions in the world. So far, many types of converters have been invented. Oscillating body systems are a major class of WECs, which typically have one degree of freedom(DOF), and the power absorption efficiency is not quite satisfactory. In this paper, a 3-DOF WEC is proposed and a simplified frequency-domain dynamic model of the WEC depending on the linear potential theory is conducted. The performances of three geometries of the oscillating body including the cone, the cylinder and the hemisphere have been compared, and the results show that the hemisphere is more suitable for the 3-DOF WEC.Subsequently, the relationship among the parameters of the hemisphere is established based on the equal natural frequencies of the heave and pitch(or roll) motions, and the results show that lowering the center of gravity leads to the better power absorption in the pitch(or roll) motion. In the end, the power matrixes of different sizes of the hemispheres under different irregular waves are obtained, which can give a size design reference for engineers.

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