System and a method for performing modal analysis on a structure
AssigneeCity University of Hong Kong
InventorsYuncheng He, Qiusheng Li
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Abstract
A method for performing modal analysis on a structure includes the steps of dividing the structure into a plurality of layers each having an individual centroid; determining a movement of a testing point on each layer with respect to the individual centroid of the plurality of layers, wherein the testing point is at a predetermined distance from the individual centroid along a testing plane; and processing the movement of the testing point on each layer to determine a modal response of the structure. A system for performing modal analysis on a structure includes a movement detection module and a processing module for carrying out the method.
Claims27
A method for performing modal analysis on a structure comprising the steps of:
- dividing the structure into a plurality of layers each having an individual centroid;
- deploying a detector at a single testing point on each of the plurality of layers, the detector being arranged to detect a vibration or a movement, wherein the single testing point is at a predetermined distance from the individual centroid along a testing plane, and wherein the vibration or the movement is determined by detecting at least two orthogonal testing directions of the single testing point on each of the plurality of layers of the structure;
- upon detecting the vibration of the structure under an environmental excitation and/or a manual excitation, determining a movement of the single testing point on each of the plurality of layers with respect to the individual centroid of the plurality of layers
- processing the movement of the single testing point on each layer to determine a modal response of the structure;
- identifying a torsional mode and a swaying mode of a movement of the structure;
- wherein processing the movement of the single testing point on each layer includes:
- determining a plurality of instantaneous vibration directions of the single testing point on each of the plurality of layers and determining a plurality of instantaneous vibration amplitudes corresponding to the single testing point on each of the plurality of layers, and processing a plurality of modal components of the modal response obtained in the single testing point on each of the plurality of layers.
A system for performing modal analysis on a structure comprising:
- a movement detection module arranged to determine a movement of a single testing point on each of a plurality of layers divided in a structure with respect to an individual centroid of each of the plurality of layers, wherein the testing point is at a predetermined distance from the individual centroid along a testing plane;
- and
- a processing module arranged to process the movement of the testing point on each layer to determine a modal response of the structure;
- wherein the movement detection module includes a plurality of detectors, with one of said plurality of detectors deployed at each testing point on each of the plurality of layers, and arranged to detect the movement of the testing point on each of the plurality of layers upon detecting a vibration of the structure under an environmental excitation and/or a manual excitation, the vibration and/or the movement is determined by detecting at least two orthogonal testing directions of the single testing point on each of the plurality of layers of the structure;
- and
- wherein the processing module is arranged to determine the movement of the testing point by determining a plurality of instantaneous vibration directions of the testing point on each of the plurality of layers and determining a plurality of instantaneous vibration amplitudes corresponding to the testing point on each of the plurality of layers, and to process a plurality of modal components of the modal response obtained in the single testing point on each of the plurality of layers;
- and wherein the processing module is further arranged to identify a torsional mode and a swaying mode of a movement of the structure.
Dependencies are inferred from the claim text.