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检索条件"机构=AVL/AST-Advanced Simulation Technologies"

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Two active metamaterial cells for nonreciprocal vibration transmission 30

Two active metamaterial cells for nonreciprocal vibration tr...

引用

30th International Conference on Noise and Vibration Engineering, ISMA 2022 and 9th International Conference on Uncertainty in Structural Dynamics, USD 2022

作者： Jalšić, M. Alujević, N. Arandia-Krešić, S. Ćatipović, I. AVL-AST Anstalt für Verbrennungskraftmaschinen List Advanced Simulation Technologies Strojarska 22 Zagreb10000 Croatia University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Ivana Lučića 5 Zagreb10000 Croatia

ISBN: (纸本)9789082893151

This paper focuses on the conceptual development and the experimental validation of two active structural cells that do not obey the reciprocity principle. Both cells considered, when activated, significantly attenuate vibration transmission through them in one direction and increase it in the opposite direction. The loss of reciprocity in both cells is induced by using velocity feedback control systems with non-collocated sensor-actuator pairs. Electrodynamic force actuators and seismic accelerometers with time-integrated outputs are used. An electromechanically fully coupled lumped-parameter model is developed per either active cell configuration. The models are then used to analyse the control systems' stability and performance. Finally, the theoretical findings are validated experimentally using a dedicated 3D-printed experimental setup. A substantial reduction of vibration transmission in the desired direction, accompanied by an increase in the opposite one is recorded experimentally for both cells. © 2022 Proceedings of ISMA 2022 - International Conference on Noise and Vibration Engineering and USD 2022 - International Conference on Uncertainty in Structural Dynamics. All rights reserved.

关键词： Cells

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System Approach for Quantifying Local Measures for Reducing Friction in a Transmission and its Effects in the Vehicle Efficiency under Real Driving Conditions 1

引用

19. ATZlive-Veranstaltung simulation und Test, 2018

作者： Resch, Thomas Baier, Wolfgang Klarin, Borislav Marusic, Stanislav Varga, Nikola AVL LIST GmbH Advanced Simulation Technologies Graz Austria AVL-AST d.o.o Zagreb Croatia

ISBN: (数字)9783658208288

ISBN: (纸本)9783658208271

The calculation of mileage, emissions and consumption as well as energy management is essentially carried out by means of driving cycle simulation. These system models take into account all components of the vehicle and their interaction, whereby mechanical, hydraulic and electrical energy flows can be depicted here. The load states correspond to different standardized or real driving cycles. Such approaches are very suitable for the investigation of system parameters (e.g. total weight), different drive concepts (e.g. stages of hybridization), controls and control systems, as well as influences of road profile and driving cycles as well as driving styles up to integration into the real-time environment at the test stand. The subsystems and components used in this case are limited in their detailing and various influences can often be taken into account only by roughly known factors or simple formulas. These methods quickly reach their limits when it comes to the quantification of local effects, such as friction, with relatively small influences, which in themselves can make an important contribution to the overall improvement of consumption and CO2 emissions. The detailed investigation of such effects for sub-systems and components is carried out using engine cycle simulation by help of enhanced analysis methods with 3D models. Such methods are limited by their high model complexity with respect to the real time to be simulated and are therefore not directly suitable for statements such as consumption or global energy flows. Especially for complex drive trains such as for hybrids, where the energy supply is controlled and adjusted to the actual driving conditions, their applicability is thus limited. In the present paper, an efficient approach is presented in which look-up tables are used for the necessary input data of the driving cycle simulation, which are calculated in advance by means of engine cycle simulations. The two approaches are thus coupled offline. Th

关键词： Table lookup

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Relief mapping for urban and natural environments rendering

Relief mapping for urban and natural environments rendering

引用

作者： Janković, D. Mihajlović, Z. AVL/AST Advanced Simulation Technologies Zagreb Croatia Department of Electronics Microelectronics Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

ISBN: (纸本)9789532330670

Terrain models typically contain huge amount of data so they are very time consuming for visualization purposes. This especially comes to the forefront when urban environments are included. The main compromise in representation of the complex environments is between achieved quality and time consumption. With the simple texture representation of complex environments we will accomplish fast application, and with the large polygonal meshes, high quality of the rendered scene. In this paper we propose rendering of urban and natural environments using parallax and relief mapping. This approach combines benefits of the rendering of polygonal meshes and texture approach. Thereby, in the proposed approach improved quality on the one side and increased speed on the other side is combined. The applicability of the method is demonstrated trough parallax and relief mapping within the Irrilicht open source graphics engine. The shaders programs were made with the GLSL shader language. As the result, the tests were made to determine the possible usage of parallax and relief mapping in the display of natural and urban environments. © 2011 MIPRO.

关键词： Mapping

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Relief mapping for urban and natural environments rendering

Relief mapping for urban and natural environments rendering

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Proceedings of the International Convention MIPRO

作者： D. Janković Ž. Mihajlović AVL/AST-Advanced Simulation Technologies Zagreb Croatia Faculty of Electrical Engineering and Computing Department of Electronics Microelectronics Computer Science and Intelligent Systems University of Zagreb Zagreb Croatia

关键词： Rendering (computer graphics) Urban areas Approximation methods Three dimensional displays Graphics processing unit Pixel

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Visual analysis and exploration of fluid flow in a cooling jacket

Visual analysis and exploration of fluid flow in a cooling j...

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IEEE Conference on Visualization

作者： R.S. Laramee C. Garth H. Doleisch J. Schneider H. Hauser H. Hagen VRVis Research Center Vienna Austria Department of Computer Science University of Kaiserslautern Germany Department of Advanced Simulation Technologies (AST) AVL Graz Austria

We present a visual analysis and exploration of fluid flow through a cooling jacket. Engineers invest a large amount of time and serious effort to optimize the flow through this engine component because of its important role in transferring heat away from the engine block. In this study we examine the design goals that engineers apply in order to construct an ideal-as-possible cooling jacket geometry and use a broad range of visualization tools in order to analyze, explore, and present the results. We systematically employ direct, geometric, and texture-based flow visualization techniques as well as automatic feature extraction and interactive feature-based methodology. And we discuss the relative advantages and disadvantages of these approaches as well as the challenges, both technical and perceptual with this application. The result is a feature-rich state-of-the-art flow visualization analysis applied to an important and complex data set from real-world computational fluid dynamics simulations.

关键词： Fluid flow Cooling Data visualization Feature extraction Heat engines Heat transfer Design engineering Geometry Computational fluid dynamics Computational modeling

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Analysis of engine dynamics under transient run-up conditions

Analysis of engine dynamics under transient run-up condition...

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2004 SAE World Congress

作者： Resch, Thomas Klarin, Borislav RESCH Customer Services Advanced Simulation Technologies AVL LIST GmbH Hans-List-Platz 1 A-8020 Graz Austria Powertrain Tool Development Advanced Simulation Technologies AVL-AST D.o.o. Avenija Dubrovnik 10/2 HR-10020 Zagreb Croatia

ISBN: (纸本)0768013194

The target of dynamic simulation is to investigate complex engine dynamic behavior in the whole speed range under different loading conditions in the most effective way during Engine Development Process (EDP). avl has developed a method for transient run-up analysis by using the simulation tool avl EXCITE. The main objective of this new method is the controlled speed increase by defining a speed ramp. Transient run-up analysis is of interest for different kind of analysis during the EDP, such as crankshaft dynamics and strength, low frequency vibration analysis, bracket strength and durability analysis, acoustic analysis, etc. By using this method the time required for simulations and thus the whole project duration is significantly reduced. Conventionally the speed range is divided in single speed steps and for each speed a separate transient simulation has to be performed. The number of these simulations depends on the required speed resolution. The run-up analysis integrates all these separate simulations in one single EXCITE run. As it is possible to analyze the complete speed range of interest continuously in time domain, all resonances can be detected and the complex engine dynamic behavior can be predicted. In addition to reduced process time a transient run-up analysis can give more detailed answers on how a particular parameter influences a specific dynamic behavior of the engine. avl EXCITE is a non-linear flexible multi-body system solver. The components of the power unit are treated as separate flexible parts (subsystems) which perform either only small vibrations (e.g. engine block) or vibrations coupled with big global movements (e.g. crankshaft, connecting rod). The engine components are coupled with forces in the connections by different linear or non-linear joints, considering e.g. The non-linear behavior of the oil film in bearings and piston-liner contacts. Due to the high non-linearities in the system, the analysis is performed in time domain, by

关键词： Engines

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Calculation of flow in mixing vessels with various turbulence models

Calculation of flow in mixing vessels with various turbulenc...

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Proceedings of the ASME Heat Transfer/Fluids Engineering Summer Conference 2004, HT/FED 2004

作者： Basara, Branislav Alajbegovic, Ales Beader, Decan Advanced Simulation Technologies AVL List GmbH Hans List Platz 1 A-8020 Graz Austria AVL Powertrain Engineering Inc. 47519 Halyard Drive Plymouth MI 48170-2438 United States AVL-AST FS-LFDT Askerceva 6 SI-1000 Ljubljana Slovenia General Dynamics P.O. Box 134008 Ann Arbor MI 48113-4008 United States

The paper presents calculations of flow in a mixing vessel stirred by a six-blade Rushton impeller. Mathematical model used in computations is based on the ensemble averaged conservation equations. An efficient finite-volume method based on unstructured grids with rotating sliding parts composed of arbitrary polyhedral elements is used together with various turbulence models. Besides the standard k-Ε model which served as a reference, k-Ε-v2 model (Durbin, 1995) and the recently proposed hybrid EVM/RSM turbulence model (Basara & Jakirlic, 2003) were used in the calculations. The main aim of the paper is to investigate if more advanced turbulence models are needed for this type of CFD applications. The results are compared with the available experimental data. Copyright © 2004 by ASME.

关键词： Turbulence

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