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 article, a non-contact experimental technique for measuring modal parameters of a rectangular aluminum plate with free boundaries using only the output data was presented, with the intention to apply the technique to turbine blades.
32 citations
TL;DR: In this article, the modal characteristic of gearbox housing with applied load is examined and the first step involved solution of static analysis with load in form of bearing reactions and then modal analysis was performed to obtain natural frequencies and modal shapes.
32 citations
Patent•
03 Nov 2000
TL;DR: In this article, a spectral density matrix function is determined from the data of the measurements, and auto spectral densities for the individual modes are identified performing a decomposition based on the Singular Value Decomposition technique.
Abstract: Output-only modal testing of an object. Vibrations are excited in said object and measured by a number of vibration sensitive detectors. From the data of the measurements, a spectral density matrix function is determined. From this density matrix, auto spectral densities for the individual modes are identified performing a decomposition based on the Singular Value Decomposition technique. From the auto spectral densities of the individual modes, natural frequencies and damping ratios for the modes can be estimated, and from the singular vectors of the Singular Value Decomposition, the modes shapes can be estimated.
32 citations
01 Jan 1996
TL;DR: In this paper, a force conversion system is applied to a structure and the output of which is the actual force(s) applied to the structure, and the white noise inputs and the structure's responses are then used to identify the combined system.
Abstract: Modal parameter identification from ambient responses due to a general unknown random inputs is investigated. Existing identification techniques which are based on the assumptions of white noise and or stationary random inputs are utilized even though the inputs conditions are not satisfied. This is accomplished via adding. in cascade. a force conversion system to the structure’s system under consideration. The input to the force conversion system is white noise and the output of which is the actual force(s) applied to the structure. The white noise input(s) and the structure’s responses are then used to identify the combined system. Identification results are then sorted as either structural parameters or input force(s) characteristics.
32 citations
TL;DR: In this paper, an energy-based representation of modal damping in structural cables is derived in the form of the product of the modal strain energy ratio and loss factor.
32 citations