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RISS 인기검색어
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- 저자 : Leth (검색결과 7 건)
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Simulating dynamics, durability and noise emission of wind turbines in a single CAE environment
Guillaume Lethé,J. De Cuyper,J. Kang,Matthew Furman,Dick Kading 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.4
To optimize the design of their windturbines, manufacturers make use of simulation tools to predict the loads that the different components need to transmit along the drivetrain from the blades to the generator. Using detailed 3D Multibody simulation allows for in-depth studies, capturing the dynamic behavior of the overall system. Multi-body simulation is used to assess the structural reliability of components such as the gearbox and to make sure they resist the extreme and unpredictable loads from the wind for a reasonable lifetime. LMS Virtual.Lab provides state-of-the art methods to model gearboxes and the meshing of gears with varying stiffness. It also provides capabilities to model the rotorblade as well as the generator. The complete system is built from the subsystems assembled in a versatile and modular way. Using LMS Virtual.Lab Motion, a dynamic simulation is finally performed to visualize the behavior of the system trough graphs and animations. The integrated simulation capabilities within LMS Virtual.Lab environment also offer an efficient solution to analyze and optimize the durability performance, noise emissions and overall yield of wind turbines. Accurate loads are easily generated with LMS Virtual.Lab Motion thanks to state-of-the-art contact formulations suited for system level analysis. Those loads lead the engineers to evaluate the stresses occurring in each component and the vibrations generated in the structure. The environment enables to quickly analyze the effect of design changes on a specific performance attribute, which allows engineering teams to perform fast optimization loops from the early development stages onwards.
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Image segmentation based on modified graph-cut algorithm
Le, T H,Jung, S.-W,Choi, K.-S,Ko, S.-J IET 2010 Electronics letters Vol.46 No.16
<P>The regularising parameter of the energy function in the graph-cut based image segmentation methods should be carefully determined since it strongly affects the image segmentation result. Presented is a modified graph-cut technique using a novel energy function without the regularising parameter for image segmentation. In addition, a mixture colour model is employed to apply the proposed technique to colour image segmentation effectively. Experimental results show that the proposed method outperforms the conventional graph-cut algorithm in terms of segmentation accuracy and ease of use.</P>
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Generalized Hierarchical Block Circulant Structure of Multi-agent Systems
Muhammad Iqbal,John Leth,Trung Dung Ngo 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.3
In this paper, we consider solving the rendezvous problem in multi-agent systems using factor circulantstrategy and generalized hierarchical block circulant strategy. First, we provide a centralized control strategydesigned under factor circulant interaction to enable the agents to rendezvous at a point dictated by the beacon. Second, we introduce a hierarchical block circulant structure with the aim of solving the rendezvous problem in adistributed manner and improve the rate of convergence of multiple agents to a point. Simulation results demonstratesthe key theoretical results.
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Precise Model Analysis for 3-phase High Power Converter using the Harmonic State Space Modeling
JunBum Kwon,Xiongfei Wang,Frede Blaabjerg,Claus Leth Bak 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper presents about the generalized multi-frequency modeling and analysis methodology, which can be used in control loop design and stability analysis. In terms of the switching frequency of high power converter, there can be harmonics interruption if the voltage source converter has a low switching frequency ratio or multisampling frequency. The range of the control bandwidth can include the switching component. Thus, the systems become unstable. This paper applies the Harmonic State Space (HSS) Modeling method in order to find out the transfer function for each harmonics terms. The modeling procedure shows the precision in the analysis of the stability as well as the controller design. The overall results are validated by using not only the non-linear time domain simulation, but also the analytical model.
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Linda P. Jakobsen,Rehannah Borup,Janni Vestergaard,Lars A. Larsen,Kasper Lage,Lisa Leth Maroun,Inger Kjaer,Carsten U. Niemann,Mikael Andersen,Mary A. Knudsen,Kjeld Møllgård,Niels Tommerup 생화학분자생물학회 2009 Experimental and molecular medicine Vol.41 No.2
Cleft lip and/or palate (CL/P) is a common congenital malformation with a complex etiology which is not fully elucidated yet. Epidemiological studies point to different etiologies in the cleft lip and palate subgroups, isolated cleft lip (CL), isolated cleft palate (CP) and combined cleft lip and palate (CLP). In order to understand the biological basis in these cleft lip and palate subgroups better we studied the expression profiles in human tissue from patients with CL/P. In each of the CL/P subgroups, samples were obtained from three patients and gene expression analysis was performed. Moreover, selected differentially expressed genes were analyzed by quantitative RT-PCR, and by immunohistochemical staining of craniofacial tissue from human embryos. Osteopontin (SPP1) and other immune related genes were significantly higher expressed in palate tissue from patients with CLP compared to CP and immunostaining in palatal shelves against SPP1, chemokine receptor 4 (CXCR4) and serglycin (PRG1) in human embryonic craniofacial tissue were positive, supporting a role for these genes in palatal development. However, gene expression profiles are subject to variations during growth and therefore we recommend that future gene expression in CL/P studies should use tissue from the correct embryonic time and place if possible, to overcome the biases in the presented study. Cleft lip and/or palate (CL/P) is a common congenital malformation with a complex etiology which is not fully elucidated yet. Epidemiological studies point to different etiologies in the cleft lip and palate subgroups, isolated cleft lip (CL), isolated cleft palate (CP) and combined cleft lip and palate (CLP). In order to understand the biological basis in these cleft lip and palate subgroups better we studied the expression profiles in human tissue from patients with CL/P. In each of the CL/P subgroups, samples were obtained from three patients and gene expression analysis was performed. Moreover, selected differentially expressed genes were analyzed by quantitative RT-PCR, and by immunohistochemical staining of craniofacial tissue from human embryos. Osteopontin (SPP1) and other immune related genes were significantly higher expressed in palate tissue from patients with CLP compared to CP and immunostaining in palatal shelves against SPP1, chemokine receptor 4 (CXCR4) and serglycin (PRG1) in human embryonic craniofacial tissue were positive, supporting a role for these genes in palatal development. However, gene expression profiles are subject to variations during growth and therefore we recommend that future gene expression in CL/P studies should use tissue from the correct embryonic time and place if possible, to overcome the biases in the presented study.
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