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Structural modal sensitivity analysis method based on novel actual measurement standardization technology

A technique of sensitivity analysis and structural mode, applied in design optimization/simulation, special data processing applications, instruments, etc.

Pending Publication Date: 2021-12-10
CHANGCHUN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a kind of structural modal sensitivity analysis method based on novel measured standardization technology, thus solve the foregoing problems existing in the prior art

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  • Structural modal sensitivity analysis method based on novel actual measurement standardization technology
  • Structural modal sensitivity analysis method based on novel actual measurement standardization technology
  • Structural modal sensitivity analysis method based on novel actual measurement standardization technology

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Embodiment 1

[0041] This embodiment provides a structural modal sensitivity analysis method based on a novel measured normalization technology, which includes the following steps:

[0042] S1, obtain the mass and stiffness matrix of the structural system, calculate the natural frequency and the initial output real mode of the structural system;

[0043] S2, adjust the initial output real mode to make it meet the normalization condition, and obtain the normalized real mode;

[0044] S3, select a certain design parameter L, and calculate the sensitivity of the property matrix of the structural system;

[0045] S4, calculating the first-order sensitivity and second-order sensitivity of the normalized real mode, respectively.

[0046] In step S1, specifically include:

[0047] S11, obtain the mass M and stiffness matrix K of the structural system, and calculate D=-M -1 K;

[0048] S12, using MATLAB software to calculate the eigenvalue λ of the real mode D i , and the corresponding initial...

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Abstract

The invention discloses a structural modal sensitivity analysis method based on a novel actual measurement standardization technology, and the method comprises the following steps: obtaining the mass and stiffness matrix of a structural system, and calculating the inherent frequency and the initial output real modal of the structural system; adjusting the initial output real mode to enable the initial output real mode to meet a normalized condition to obtain a normalized real mode; selecting a certain design parameter L, and calculating the sensitivity of the structural system property matrix with respect to the design parameter L; and respectively calculating the first-order sensitivity and the second-order sensitivity of the normalized real mode with respect to the design parameter L. According to the method provided by the invention, only the order of mode needing to consider derivation needs to be calculated, and the method is irrelevant to other modes; the frequency and the modal sensitivity can be calculated at the same time; the problem that the diversified actual measurement standardization technology and the sensitivity analysis method thereof in the fields of model correction, damage identification, structural design, optimization control and the like are not consistent can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of modal normalization, in particular to a structural modal sensitivity analysis method based on a novel measured normalization technology. Background technique [0002] The sensitivity of structural natural frequencies and mode shapes is an important content in many engineering applications. They are widely used in finite element model correction, damage detection, structural optimization and dynamic sensitivity analysis. [0003] In the past thirty years, many studies have used vibration measurements to correct the finite element model. The existing model correction methods can be roughly divided into two categories: direct method and iterative method. The direct method modifies the elements of the stiffness and mass matrices directly. This method allows the revised analytical model to reproduce the measured vibrational modal data, but there is no guarantee that it truly represents the physical propertie...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F119/02
CPCG06F30/23G06F2119/02Y02T90/00
Inventor 张淼于澜张欣曹萍
Owner CHANGCHUN INST OF TECH
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