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Different Least Squares Approaches to Identify Dynamic Forces Acting on an Engine Cylinder Block

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This paper presents and compares two different least squares (LS) approaches to identify the dynamic forces acting on a structure from acceleration measurements. An overview of different papers dealing with such inverse problems is realized in the introduction. An original technique based on weighting LS is suggested to improve the classical method in the case of complex structures showing heterogeneous stiffnesses. This technique is applied to an experiment realized on an engine cylinder block. A second LS technique, known as total LS (TLS), is presented and adapted to the indirect force measurement problem by the means of the principal component analysis (PCA). Both Weighted LS and Weighted TLS approaches are compared in a theoretical way and in the frame of the experiment on the engine cylinder block.
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Document Type: Research Article

Publication date: March 1, 2004

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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