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Technical Paper

Application of Energy Flow Analysis Focused on Path Visualization into Vehicle Design

The development of new design tools to predict the vibro-acoustic behavior within the vehicle development process is of essential importance to achieve better products in an ever shorter timeframe. In this paper, an energy flow post-processing tool for structural dynamic analysis is presented. The method is based on the conversion of conventional finite element (FE) results into energy quantities corresponding with each of the vehicle subcomponents. Based on the global dynamic system behavior and local subcomponent descriptions, one can efficiently evaluate the energy distribution and analyze the vibro-acoustic behavior in complex structures. By using energy as a response variable, instead of conventional design variables as pressure or velocity, one can obtain important information regarding the understanding of the vibro-acoustic behavior of the system.
Technical Paper

A Novel TPA Method Using Parametric Load Models: Validation on Experimental and Industrial Cases

Despite the fact that Transfer Path Analysis (TPA) is a well known and widely used NVH tool it still has some hindrances, the most significant being the huge measurement time to build the full data model. For this reason the industry is constantly seeking for faster methods. The core concepts of a novel TPA approach have already been published in a paper at the ISMA 2008 Conference in Leuven, Belgium. The key idea of the method is the use of parametric models for the estimation of loads. These parameters are frequency independent as opposed to e.g. the classical inverse force identification method where the loads have to be calculated separately for each frequency step. This makes the method scalable, enabling the engineer to use a simpler model based on a small amount of measurement data for quick troubleshooting or simply increase accuracy by a few additional measurements and using a more complex model.
Technical Paper

Concepts for Pro-Active Life Cycle Design Support Tools

When categorising the available ecodesign tools according to the methodological design phases and steps, most design for environment tools prove to be analysis oriented and mainly suitable for the final, detailed design phases. This paper emphasises emerging methods allowing the integration of environmental issues earlier in the design process and in a more pro-active way. These methods are based on a context sensitive access to structured guidelines and examples. Finally, the integration of these pro-active tools in a holistic life cycle design system, including also analysis techniques such as life cycle assessment, is shortly described.
Journal Article

A Hybrid Wave Based - Modally Reduced Finite Element Method for the Efficient Analysis of Low- and Mid-frequency Car Cavity Acoustics

This paper presents a newly developed hybrid simulation technique for uncoupled acoustic analysis of interior cavities. This method applies a Wave Based model for a large, geometrically simple portion of the acoustic cavity. The superficial details of the problem domain are modeled using a modally reduced finite element model. The resulting hybrid model benefits from the computational efficiency of the Wave Based Method, while retaining the Finite Element Method's ability to model the actual geometry of the problem in great detail. Application of this approach to the analysis of a moderately simplified acoustic car cavity shows the improved computational efficiency as compared to classical finite element procedures and illustrates the potential of the hybrid method as a powerful tool for the analysis of three-dimensional interior acoustic systems.