Topic
Modal testing
About: Modal testing is a research topic. Over the lifetime, 4047 publications have been published within this topic receiving 64772 citations.
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TL;DR: A new lump model is presented that accounts for the nonlinear phenomena of partial clearance and friction, and has analytical parameters related to the flange geometry, and is well suited for the early design phase of new aero-engine casings.
51 citations
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TL;DR: In this article, a mode-based approach is described for the mid-frequency vibration analysis of a complex structure built-up from a longwavelength source and a short-wavelength receiver.
51 citations
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01 Jan 1980TL;DR: In this article, a method for determining maximum changes in analytical mass and stiffness matrices to make them consistent with a set of measured normal modes and natural frequencies is presented, which will be an improved base for studies of physical changes, boundary condition changes, and for prediction of forced responses.
Abstract: A method developed to determine maximum changes in analytical mass and stiffness matrices to make them consistent with a set of measured normal modes and natural frequencies is presented. The corrected model will be an improved base for studies of physical changes, boundary condition changes, and for prediction of forced responses. The method features efficient procedures not requiring solutions of the eigenvalue problem, and the ability to have more degrees of freedom than the test data. In addition, modal displacements are obtained for all analytical degrees of freedom, and the frequency dependence of the coordinate transformations is properly treated.
51 citations
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TL;DR: In this article, a modal identification technique for the dynamic behavior of linear time-invariant systems is presented, using a state space formulation for the equations of motion for a mechanical structure, an algorithm is developed to identify its state transition matrix from measured multiple input/multiple output relations (frequency response functions).
51 citations
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TL;DR: In this paper, a robust controller design for multi-degree-of-freedom active vibration isolation is proposed, which accounts for plant uncertainties and payload disturbances using frequency-shaped sliding control, and the practical effects of boundary layer approximation in the resulting controller design are examined.
51 citations