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A new noniterative frequency domain parameter estimation technique is proposed. It is based on a weighted total least squares approach, starting from multiple input multiple output frequency response functions. One of the specific advantages of the technique lies in the very stable identification of the system poles as a function of the specified system order, leading to easy-to-interpret stabilization diagrams. This implies a potential for automating the method and to apply it to 'difficult' estimation cases. Several real-life case studies are discussed, one related to holographic modal analysis in the medium frequency range, one to the modal testing of a fully trimmed vehicle.

Random vibration testing with increased kurtosis introduces high peaks into shaker drive signals to simulate land vehicle vibration more accurately and also to shorten the required test time. Two methods of controlling kurtosis by phase manipulation in the inverse fast Fourier transform were implemented, tested, and compared. The first method generates high-kurtosis excitations with a gradual, smooth pattern of peak heights from low to high, and the second method produces isolated high peaks with intervals of stable background vibration between them. When applying a kurtosis increase for accelerated fatigue damage testing, the kurtosis control method must be able to pass high-kurtosis values from the generated shaker table vibration into the stress response of the unit under test. However, this is not always the case, and only one of the considered methods was capable of doing so. In the article, the fatigue damage spectrum model was used for an evaluation of the time to failure. An experimental study was carried out using operational vibration measured in a car. Shaker testing of cantilever specimens was performed for Gaussian, non-Gaussian, and accelerated non-Gaussian excitations. [ABSTRACT FROM AUTHOR]

Van der Auweraer, H., et al. Advanced mesh based design optimization for early-stage virtual prototyping. Proceedings of the 2004 International Conference on Noise and Vibration Engineering, Leuven, Belgium: 919-932, Sept. [...]

Peeters, B., A. Vecchio, and H. Van der Auweraer. Poly-MAX modal parameter estimation from operational data. Proceedings of the 2004 International Conference on Noise and Vibration Engineering, Leuven, Belgium: 1049-1064, [...]

Van der Auweraer, H., and J. Leuridan. A new testing paradigm for today's product development process--Part 2. S/V, Sound and Vibration (United States) 39(11):18-22, Nov. 2005 (sv@mindspring.com). KEYWORDS: finite element [...]

Virtual prototyping is essential for optimizing product behavior. In this paper, methodologies are presented to model smart structures, actuators, and sensors to produce a sound synthesis model for sound quality optimization. The methodology is applied to a system consisting of a simplified car cavity built with concrete to assure the acoustic boundary conditions.

To identify modal models under operational conditions, parameter estimation techniques are used often. In this article, an overview is given of these techniques and their industrial applications. Practical application constraints of the approaches as well as the potential use that can be made of extracted models are reviewed. Applications include automotive, aircraft, space, and civil construction.