Baeten A.,FH Augsburg
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2010
This paper is Volume 2 of the ISOPE-2009 paper "Optimization of LNG tank shape in terms of sloshing impact pressure" and focuses on the sloshing parameter analysis. For this study a computationally efficient approach has been used, which is flexible in geometry and load spectrum. It provides time accurate wall pressure results in three dimensions and 6 Degrees-of-Freedom. Based on the results of specific test cases in volume 1 of this study, rectangular, cylindrical and spherical test tanks are discussed to optimize the tank shape in terms of impact pressure loading. Thereby, the LNG tank geometry has been varied in terms of curvature, steepness of the walls, and length-to-height ratio in order to minimize the LNG impact pressure on the tank. Cylindrical and spherical tank shapes have been analyzed in a multi-tank configuration undergoing forced oscillations in 6 Degrees-of-Freedom representing ocean waves. It has been found that in a multi-tank configuration, the spherical tanks help reducing the overall loads in a specific natural frequency domain when combined with corner-shaped tanks. © 2010 by The International Society of Offshore and Polar Engineers (ISOPE).
Baeten A.,FH Augsburg
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2015
This paper focuses on an innovative modeling approach for the energy dissipation during liquid-structure interaction for an impact on a multilayer material using a Lagrange-based particle-cluster method. This approach is based on a drop-test experiment, which is designed to capture the hydrodynamic forces on a rigid body undergoing accelerations relative to a liquid mass. It is implemented into a computationally efficient numerical multi-body simulation program, which is flexible in geometry and dynamic load spectrum. It features a particle-based liquid model and provides time accurate hydrodynamic pressure results in three dimensions and 6 Degrees-of-Freedom. Based on the results of the drop test experiment, the dissipated energy during liquid impact is computed for a cylindrical reference geometry. An experimental impact set-up analyzes the same material with respect to the structural response. Thereby, the reference body geometry is flexible in terms of wall friction, elasticity laws and damping coefficients. A special focus is set on the energy dissipation characteristics and the parameters that influence the degradation of the hydrodynamic forces during the impact. Copyright © 2015 by the International Society of Offshore and Polar Engineers (ISOPE).
Nguyen Q.,German Research Center for Artificial Intelligence |
Kipp M.,FH Augsburg
Conference on Human Factors in Computing Systems - Proceedings | Year: 2014
The translation and rotation of objects with two fingers is a well-explored multitouch technique. However, there are some unsolved questions regarding the optimal conditions under which this technique functions best. Does it matter in which direction the movement is oriented? Does parallel or sequential performance of the two operations work best? This study attempts to answer this question using a typical Fitts' Law setup but with varying translation-rotation orientation combinations. The results show that right-oriented movements were faster and easier than left-oriented ones. Movement combinations which went in different directions (translation right, rotation left, and vice versa) were found more tiresome and resulted in more strategy switches compared to equi-directional combinations. Our findings can inform positioning decisions in interaction design and contribute to theoretical adjustments to Fitts' Law.
Horbach J.,FH Augsburg |
Chen Q.,CAS Institute of Policy and Management |
Rennings K.,Center for European Economic Research |
Vogele S.,Julich Research Center
Environmental Innovation and Societal Transitions | Year: 2014
Despite high CO2 emissions released by coal-fired energy production, coal will remain an important source of energy in coming decades. This case study explores the lead market status of China, Germany, Japan and the US for clean coal technologies. We concentrate on two existing technological standards: supercritical (SC) and ultra-supercritical (USC) pulverized coal technologies. In 1960s and 1970s, the US was a lead market for SC und USC technologies. During these decades, Japan was a lag market, but it surpassed the US in the early 1980s. Recently price and demand advantages began to shift to China. We conclude that lead market status may switch over time to markets with high growth rates, although first mover advantages may exist in non-lead markets for some R&D-intensive products, such as turbines. Less R&D-intensive products, such as boilers, are attractive as a basis for leapfrogging strategies, which many emerging countries have been successfully employing. © 2013 Elsevier B.V. All rights reserved.
Horbach J.,FH Augsburg
Environmental Innovation and Societal Transitions | Year: 2016
The determinants of eco-innovation activities have been widely explored for single countries. However, there is a lack of analyses comparing different countries. The Community Innovation Survey (CIS 2008) allows for an analysis of the determinants of eco-innovation in 19 different European countries. This paper focuses on Eastern Europe as the determinants of eco-innovation have not yet been systematically analyzed for these countries. Concerning the introduction of eco-innovations, this analysis shows that regulation activities and environmentally related subsidies seem to be more important for the Eastern countries than they are for the "richer" Western European countries. Furthermore, the Eastern European countries rely more on competitors and external R&D as information sources, indicating a technology transfer from West to East. © 2015 Elsevier B.V. All rights reserved.