Topic
Modal testing
About: Modal testing is a research topic. Over the lifetime, 4047 publications have been published within this topic receiving 64772 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, a method is presented to detect and quantify structural damages from changes in modal parameters (such as natural frequencies and mode shapes), and an inverse problem is formulated to minimize the objective function, defined in terms of discrepancy between the vibration data identified by modal testing and those computed from analytical model, which then solved to locate and assess the structural damage using continuous ant colony optimization algorithm.
Abstract: A method is presented to detect and quantify structural damages from changes in modal parameters (such as natural frequencies and mode shapes). An inverse problem is formulated to minimize the objective function, defined in terms of discrepancy between the vibration data identified by modal testing and those computed from analytical model, which then solved to locate and assess the structural damage using continuous ant colony optimization algorithm. The damage is formulated as stiffness reduction factor. The study indicates potentiality of the developed code to solve a wide range of inverse identification problems.
21 citations
01 Sep 2010
TL;DR: Experimental validation on a full body-in-white proves industrial applicability of the proposed technique to overcome the downsides of the classic static test by determining both global static, as well as dynamic stiffness based on a single modal analysis test.
Abstract: Global car body stiffness is an important design attribute in vehicle design. Therefore accurate characterization of this stiffness is needed. The current industrial method for static stiffness determination has several downsides, amongst others its time consuming set-up preparation. Dynamic characterization by means of modal analysis on the other hand has high repeatability and a less time consuming set-up preparation. This paper describes and experimentally validates the industrial implementation of a method to overcome the downsides of the classic static test by determining both global static, as well as dynamic stiffness based on a single modal analysis test. The method combines several techniques available in literature. Theory behind the method is elaborated, simulation tests show the potential of the method and finally experimental validation on a full body-in-white proves industrial applicability of the proposed technique.
21 citations
TL;DR: In this article, a simple modal damping identification model developed for classically damped linear building frames is extended to the non-classically damping case, where the modulus of the transfer function of a non-damped structure matches the one of the classically Damped structure in a discrete manner, i.e., at the resonant frequencies of that function modulus.
21 citations
29 Oct 1974
TL;DR: In this paper, an approach is formulated by which structural dynamics of ships may be analyzed in a linear modal form, by employing the principal modes of the ship in vacuo, simple orthogonality relations can be retained without dependence on the necessarily approximate techniques used to estimate fluid forces.
Abstract: An approach is formulated by which structural dynamics of ships may be analysed in a linear modal form. By employing the principal modes of the ship in vacuo , simple orthogonality relations can be retained without dependence on the necessarily approximate techniques used to estimate fluid forces. It is also possible to identify modal contributions to mass, damping and stiffness for the hull and for the hydrodynamic actions separately. Those contributions of hydrodynamic origin may depend significantly on time history effects which can be measured by means of a model test; these effects can be admitted into the ship strength analysis, it is believed for the first time. It is shown how existing modal theories of ship strength and theories of seakeeping (i. e. of ‘rigid body’ motion in a seaway) fit into this more general analysis.
21 citations
TL;DR: In this article, the use of modal analysis of s-domain network models in the solution of harmonic distortion problems of industrial systems has been described, which involves the computation of the system poles, transfer function zeros as well as their sensitivities to changes in network parameters.
Abstract: This paper describes the use of modal analysis of s-domain network models in the solution of harmonic distortion problems of industrial systems. Modal analysis involves the computation of the system poles, transfer function zeros as well as their sensitivities to changes in network parameters. A new modal sensitivity coefficient and a new modal observability index are introduced. These new coefficient and index are used to solve harmonic problems in a practical industrial system having multiple harmonic sources. The results obtained are believed to demonstrate the practical value of the proposed method.
21 citations