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: In this paper, a high-order discrete-layer theory and a finite element are presented for predicting the damping of laminated composite sandwich beams, which involves quadratic and cubic terms for approximation of the inplane displacement in each discrete layer, while interlaminar shear stress continuity is imposed through the thickness.
75 citations
TL;DR: In this paper, an experimental calibration of a three-dimensional numerical model of an Alfa Pendular train vehicle based on modal parameters was performed using a submodeling/multistep approach involving two phases.
Abstract: This article describes the experimental calibration of a three-dimensional numerical model of an Alfa Pendular train vehicle based on modal parameters. The dynamic tests of the carbody and bogie of the vehicle allowed the determination of the frequencies and modal configurations of 13 vibration modes, by applying the data-driven stochastic subspace identification method. In addition, a dynamic characterisation test of the passenger-seat system was also conducted. The calibration of the model was performed using a submodelling/multistep approach involving two phases, the first one focused on the calibration of the model of the bogie under test conditions and the second one focused on the calibration of the complete model of the vehicle. The calibration was performed through an iterative method based on a genetic algorithm and allowed to obtain optimal values of 17 parameters of the numerical model. For the pairing of the vibration modes, real and complex, a recent technique was used based on the calculation of the modal strain energy. The stability of a significant number of parameters considering different initial populations demonstrated the robustness of the algorithm. The comparison of experimental and numerical responses before and after calibration revealed significant improvements in the numerical model and a very good correlation between the responses obtained with the calibrated model and the experimental responses.
75 citations
TL;DR: In this article, the dynamics of a car disc brake system is investigated by a combined analytical and numerical method, where the disc is rotated past the stationary pads and calliper in sliding friction at constant speed.
Abstract: The dynamics of a car disc brake system is investigated by a combined analytical and numerical method. The disc is rotated past the stationary pads and calliper in sliding friction at constant speed. The modal data of the disc are obtained by means of modal testing whereby a dynamic model for the disc is derived based on the thin plate theory. Then the pads, calliper and mounting are analysed by means of the finite element method. Finally the equations of motion for the whole disc brake system are established through the interfaces between the pads and the disc. The stability of the vibrating system is studied by the method of state space.
75 citations
TL;DR: In this article, a hybrid accelerometer/high-speed camera mode shape identification method was used to identify the eigenvalues, while the camera measurement is used to produce the full-field mode shapes close to 10 kHz.
75 citations
TL;DR: In this article, the authors focus on the dynamic tests of two historic structures, performed in operational conditions at different levels of ambient excitation, aimed at checking the invariance of the dynamic characteristics (i.e., natural frequencies and mode shapes) with increasing excitation amplitude.
74 citations