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, the modal radiation impedance of a rectangular panel simply supported in an infinite baffle in the presence of an inviscid, uniform, subsonic flow is determined.
22 citations
TL;DR: In this paper, the authors proposed a model updating method using the strains measured from the impact tests in structural members of steel frame in addition to modal parameters, which can accurately estimate global structural responses and is used to evaluate the state of a structure.
21 citations
TL;DR: In this paper, the authors present a methodology for conducting modal reduction on a geared rotor dynamic system under the influences of general damping and gyroscopic effects, which allows for traditional methods of system analysis to include eigen-solution analysis and frequency response.
Abstract: The presence of damping, gyroscopic behavior, and gearing complicates traditional vibration analysis. This paper presents a methodology for conducting modal reduction on a geared rotor dynamic system under the influences of general damping and gyroscopic effects. Based on the first-order, state-space methodology, a coordinate transformation is presented for diagonalizing the state equations of motion for each substructure in the system. A modal synthesis procedure assembles the system equations from the individual substructures. The substructures are coupled via gear-mesh interactions. Using this technique, the size and complexity of a model can be reduced without incurring significant loss of accuracy. The reduced model allows for traditional methods of system analysis to include eigen-solution analysis, and frequency response. Validation occurs through application to a simple geared system widely discussed in the literature. The results of the modal reduction match closely with the full finite element m...
21 citations
TL;DR: In this paper, a comparison was made between the results of a classic input-output and output-only modal analysis based on maximum likelihood system identification techniques and the identification results obtained on a classic output-output transfer function data set between the generator input signal and the structural responses.
21 citations
Patent•
13 Jan 1999
TL;DR: In this article, the modal content of any number of drive signals used to excite any vehicle on a vibrating conduit such as is found in a Coriolis mass flowmeter or vibrating tube densimeter is analyzed.
Abstract: A drive system is taught for controlling the modal content of any number of drive signals used to excite any number of drives on a vibrating conduit such as is found in a Coriolis mass flowmeter or a vibrating tube densimeter. One or more motion signals are obtained from one or more spatially distinct feedback sensors. The motion signals are preferably filtered using a multi-channel modal filter to decompose the motion signals, each of which contain modal content at a plurality of vibration modes, into n single degree of freedom modal response signals. Each modal response signal corresponds to one of the vibration modes at which the vibrating conduit is excited. The n modal response signals are input to a drive channel having a separate processing channel for each of the n modal response signals. Within each drive controller channel, the respective modal response signal is compared to a desired modal response setpoint and the resulting mode error signal is amplified by a modal gain to produce a modal excitation signal for each mode. The modal excitation signal represents the modal excitation necessarily applied to the vibrating conduit to cause the modal response to match the modal setpoint for the given mode. The modal excitation signals are transformed from the modal domain back to the physical domain and mapped to the physical locations of the drives. The resulting drive signals are applied to the drives to excite the conduit.
21 citations