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Geetha, B.
- The Performance of Half-Cuboctahedron Grid Tensegrity Systems in Roof Structures
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Affiliations
1 Department of Civil Engineering, SRM University, Kattankulanthur, Kancheepuram - 603203, Tamil Nadu, IN
1 Department of Civil Engineering, SRM University, Kattankulanthur, Kancheepuram - 603203, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 32 (2016), Pagination:Abstract
Background/Objectives: Sustainability in the use of material and economy are the watchwords of the modern engineering fraternity. Many structural systems have been evolved for this purpose. At present, the qualities of the tensegrity structures, which make the technology attractive for human use, are their resilience and ability to use the material in a very economical way. Thus, the construction of the structures using tensegrity principle will make them highly resilient and reasonably economical at the same time. Methods: Though a lot of research has been carried out on the behaviour of tensegrity systems, the area requires further research for a complete understanding. Hence, this project is aimed at analysis of a tensegrity based roof structure. The prototype module used is half-cuboctahedron. Findings: First, a single module measuring 1 m x 1 m in size, is modelled and analysed using an FEM based software. The investigations are then extended to a 2 x 2 grid, measuring 2 m x 2 m in size. The behavior of the grid is studied under the application of external loads varying the prestressing forces on the members. Later, a 4 x 4 grid, measuring 4 m x 4 m in size and an 8 x 8 grid, measuring 8 m x 8 m in size are modelled and analysed based on the 2 x 2 grid system. From the analysis, it is found that the displacements of the system satisfy the permissible limits as per previous research values. The member forces have also been analysed. Applications/Improvements: The performance of the half-cuboctahedron tensegrity grid structure proves to be more suitable for larger span structures.Keywords
Displacements, Half-Cuboctahedron, Hexagonal, Tensegrity.- Reduction in Uncertainty in Tropical Cyclone Track Forecasts over the North Indian Ocean
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Authors
Affiliations
1 India Meteorological Department, Mausam Bhavan, Lodhi Road, New Delhi 110 003, IN
1 India Meteorological Department, Mausam Bhavan, Lodhi Road, New Delhi 110 003, IN
Source
Current Science, Vol 112, No 09 (2017), Pagination: 1826-1830Abstract
Over the North Indian Ocean (NIO) basin, the uncertainty in tropical cyclone (TC) track forecast is depicted by constructing a cone of uncertainty (COU) around the forecast track for the benefit of disaster managers in their decision-making, especially with respect to area of evacuation. The COU is constructed by drawing a tangent to the circles with the radii equal to average track forecast errors during the past five years for forecast times of 12, 24, 36, …, up to 120 h. The COU which is revised periodically to reflect the track forecast accuracy, has been recently revised by India Meteorological Department (IMD) from the post-monsoon season of 2014. Hence, a study has been undertaken to evaluate this newly introduced COU forecast by IMD. The revised radii used to construct the COU have shrunk by 20-30% due to improved TC track forecast in the recent years (2009-2013). For the new COU, the radii of circles for 24, 48, 72, 96 and 120 h forecasts are 65, 105, 140, 170 and 200 nm respectively, against 80, 135, 185, 235 and 285 nm for the previous COU (2009-2013). The accuracy of the newly constructed forecast COU is 70-80% and is comparable with those of other leading TC forecasting centres in the world.Keywords
Cone of Uncertainty, Forecast, Ocean Basin, Track, Tropical Cyclone.References
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- A Hybrid Bat Approach With Tabu Search Algorithm For Test Case Selection In Object Oriented Testing
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Authors
B. Geetha
1,
D. Jeya Mala
2
Affiliations
1 Department of Computer Science and Engineering, Anna University, Chennai, IN
2 Department of Master of Computer Applications, Fatima college, IN
1 Department of Computer Science and Engineering, Anna University, Chennai, IN
2 Department of Master of Computer Applications, Fatima college, IN