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Method of order determination of engineering structure modal identification model

A technology for engineering structure and modal recognition, which is applied in the testing of machines/structural components, elastic testing, instruments, etc., to achieve the effect of simple access

Inactive Publication Date: 2017-09-05
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] The present invention aims to provide a new model order determination method for engineering structure modal recognition, and solve the problem of accurate model determination in the process of modal recognition

Method used

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  • Method of order determination of engineering structure modal identification model
  • Method of order determination of engineering structure modal identification model
  • Method of order determination of engineering structure modal identification model

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specific Embodiment approach

[0028] Taking an 8-story frame structure as an example, let the mass of each layer be 1.1×10 6 kg, the interlayer stiffness is 862.07×10 6 N / m, the damping adopts Rayleigh damping, the Rayleigh damping coefficient is determined by the damping ratio of the first two orders of 5%, the excitation form is pulse excitation, the noise level is 20% of the actual signal variance, and the response signal is the displacement of each layer of the structure . The specific implementation of the method is as follows:

[0029] (1) Let rH=150, cH=130; and let k=1, select the measured signal y from the 1st moment to the 279th moment to form Hankel matrix H(k-1) and H(k), as follows:

[0030]

[0031] In the formula: the vector y is the measured signal with noise interference; the subscript k+i represents the k+ith moment, where i=0...rH+cH+k-2; k to rH+cH+k-2 are options The number of measured time history data points of .

[0032] (2) Singular value decomposition of the Hankel matrix H...

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Abstract

The invention belongs to the technical field of engineering structures monitoring data analysis, provides a method of the order determination of an engineering structure modal identification model. By the method, each rank frequency of the algorithm preliminary solution structure is achieved through the characteristic values, next the modal response corresponding to each rank frequency is decomposed, then the root-mean-square value of the modal response is solved, and finally the modal response contribution index MRCI is obtained by summing the root-mean-square value of each degree of freedom in the modal response, the rank order and MRCI relationship diagram is generated, the rank order corresponding to the maximum of the ratios of two adjacent rank order MRCI values is found, and the found rank order is taken as the exact rank order for the model. The rank order of the model can be used as a truncation order of a singular value matrix in the characteristic algorithm, and can be used for the accurate identification of modal parameters of structures.

Description

technical field [0001] The invention belongs to the technical field of engineering structure monitoring data analysis, and relates to a model order determination method for engineering structure mode recognition. Background technique [0002] The change of the modal parameters of the engineering structure comes from the change of its own characteristics, so the performance evaluation of the structure can be carried out through the identified modal parameters. For practical engineering, because the input excitation is difficult to measure, the modal parameter identification method (operating modal analysis) based only on the structural response is more practical. At present, the more commonly used method is the subspace method based on the time domain . [0003] When using the subspace identification method for mode identification, it is necessary to determine the order of the model, and an inaccurate order will cause a large error in the identified mode. Many scholars have...

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Application Information

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IPC IPC(8): G06F17/16
CPCG06F17/16G06F17/14G01M5/0066G01N29/12
Inventor 曲春绪伊廷华李宏男
Owner DALIAN UNIV OF TECH
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