SYSTEM AND METHOD FOR AUTOMATIC MODAL PARAMETER EXTRACTION IN STRUCTURAL DYNAMICS ANALYSIS
First Claim
1. A method of automatic modal parameter extraction in structural dynamics analysis, comprising:
- obtaining a stabilization diagram of a structure using a frequency domain modal parameter extraction technique, wherein the stabilization diagram is a graph of measured transfer functions versus frequencies and wherein the measured transfer functions comprise stable poles of the structure for each modal order and the frequencies comprise modal frequencies of each of the stable poles;
allowing a user to input user modal parameters selected from the group consisting of a maximum damping ratio, a maximum number of stable poles to be selected from the stabilization diagram, and a minimum separation in frequency between consecutive stable poles;
obtaining stable poles having a damping ratio that is less than or equal to the maximum damping ratio from the stabilization diagram;
forming a histogram having bins, wherein each bin having a width approximately equal to the minimum separation in frequency between the consecutive stable poles; and
automatically extracting the modal parameter of the structure using the histogram.
2 Assignments
0 Petitions
Accused Products
Abstract
A system and method for automatic modal parameter extraction in structural dynamics analysis are disclosed. In one embodiment, a stabilization diagram of a structure is obtained using a frequency domain parameter extraction technique. The stabilization diagram is a graph of measured transfer functions which include stable poles of the structure for each modal order versus frequencies which include modal frequencies of each stable pole. Further, a user is allowed to input user modal parameters, such as a maximum damping ratio, maximum number of stable poles to be selected from the stabilization diagram, and minimum separation in frequency between consecutive stable poles. Furthermore, stable poles having a damping ratio less than or equal to the maximum damping ratio are obtained. A histogram having bins, with a width equal to the minimum separation in frequency, is obtained. Also, the modal parameter of the structure is automatically extracted using the histogram.
5 Citations
18 Claims
-
1. A method of automatic modal parameter extraction in structural dynamics analysis, comprising:
-
obtaining a stabilization diagram of a structure using a frequency domain modal parameter extraction technique, wherein the stabilization diagram is a graph of measured transfer functions versus frequencies and wherein the measured transfer functions comprise stable poles of the structure for each modal order and the frequencies comprise modal frequencies of each of the stable poles; allowing a user to input user modal parameters selected from the group consisting of a maximum damping ratio, a maximum number of stable poles to be selected from the stabilization diagram, and a minimum separation in frequency between consecutive stable poles; obtaining stable poles having a damping ratio that is less than or equal to the maximum damping ratio from the stabilization diagram; forming a histogram having bins, wherein each bin having a width approximately equal to the minimum separation in frequency between the consecutive stable poles; and automatically extracting the modal parameter of the structure using the histogram. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A modal parameter extraction system, comprising:
-
a processor; and memory coupled to the processor, wherein the memory includes a modal parameter extraction tool having instructions to; obtain a stabilization diagram of a structure using a frequency domain modal parameter extraction technique, wherein the stabilization diagram is a graph of measured transfer functions versus frequencies and wherein the measured transfer functions comprise stable poles of the structure for each modal order and the frequencies comprise modal frequencies of each of the stable poles; allow a user to input user modal parameters selected from the group consisting of a maximum damping ratio, a maximum number of stable poles to be selected from the stabilization diagram, and a minimum separation in frequency between consecutive stable poles; obtain stable poles having a damping ratio that is less than or equal to the maximum damping ratio from the stabilization diagram; form a histogram having bins, wherein each bin has a width approximately equal to the minimum separation in frequency between the consecutive stable poles; and automatically extract the modal parameter of the structure using the histogram. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
13. At least one non-transitory computer-readable storage medium for automatic modal parameter extraction in structural dynamics analysis having instructions that, when executed by a computing device, cause the computing device to:
-
obtain a stabilization diagram of a structure using a frequency domain parameter extraction technique, wherein the stabilization diagram is a graph of measured transfer functions versus frequencies, wherein the measured transfer functions comprise stable poles of the structure for each modal order and the frequencies comprise modal frequencies of each of the stable poles; allow a user to input user modal parameters selected from the group consisting of a maximum damping ratio, a maximum number of stable poles to select from the stabilization diagram, and a minimum separation in frequency between consecutive stable poles; obtain stable poles having a damping ratio that is less than or equal to the maximum damping ratio; form a histogram having bins, wherein bin has a width approximately equal to the minimum separation in frequency between the consecutive stable poles; and automatically extract the modal parameter of the structure using the histogram. - View Dependent Claims (14, 15, 16, 17, 18)
-
Specification