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Frequency domain distribution random dynamic load identification method considering spatial correlation

A technology of spatial correlation and load identification, applied in special data processing applications, complex mathematical operations, geometric CAD, etc., can solve problems such as difficulty in considering the spatial correlation of distributed random dynamic loads, poor identification effect, etc.

Pending Publication Date: 2021-09-14
SOUTHEAST UNIV
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Problems solved by technology

[0004] Purpose of the invention: In view of the difficulty in considering the spatial correlation of the distributed random dynamic load in the existing frequency domain distribution random dynamic load identification method, and the identification effect is poor, the present invention proposes a frequency domain distribution random dynamic load identification method considering the spatial correlation

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  • Frequency domain distribution random dynamic load identification method considering spatial correlation
  • Frequency domain distribution random dynamic load identification method considering spatial correlation
  • Frequency domain distribution random dynamic load identification method considering spatial correlation

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Embodiment 1

[0068] This embodiment provides a frequency domain distribution random dynamic load identification method considering spatial correlation, refer to figure 1 with figure 2 , for example figure 2 For the four-sided simply supported plate structure shown, identify the distributed random dynamic loads acting on the surface of the plate. In this embodiment, specifically, the plate is 0.4m long, 0.4m wide, and 5mm thick, and the material is aluminum with an elastic modulus of 7×10 10 Pa, Poisson's ratio is 0.3, density is 2700kg.m -3 , the damping of the structure is chosen as Rayleigh damping. It is worth noting that the damping can be any other damping model, but no matter what kind of model it is, it is a simplified calculation model for structural dynamics calculations, and Rayleigh damping is one of them A commonly used one. The modal damping ratio of each order is ξ i = 0.02.

[0069] In this embodiment, the expression of the distributed random dynamic load to be ident...

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Abstract

The invention discloses a frequency domain distribution random dynamic load identification method considering spatial correlation. The method comprises the steps: S1, establishing a finite element model of the thin-wall structure according to the geometrical shape of the thin-wall structure; S2, measuring points are arranged on the actual thin-wall structure, and a self-power spectral density function of the response is calculated according to the dynamic response of the measurement; S3, determining a corresponding measuring point position on the finite element model according to the geometric position of an actual measuring point, calculating a measuring point response in the finite element model under the excitation action of a random dynamic load distributed in an orthogonal polynomial form in a distance space, and assembling into a recognition matrix; S4, calculating a cross-power spectral density function of the distributed random dynamic load according to the identification matrix and the responded auto-power spectral density function, and reconstructing the distributed random dynamic load. The distributed random dynamic load outside the structure is identified through the structural strain response, the spatial distribution function of the distributed random dynamic load can be accurately obtained, and an indirect distributed random dynamic load obtaining method is provided.

Description

technical field [0001] The invention relates to the technical field of structural dynamics inverse problems, in particular to a frequency domain distribution random dynamic load identification method considering spatial correlation. Background technique [0002] The external load information of engineering structures is an important basis for structural dynamic analysis and condition monitoring. In many cases, engineers can summarize a series of empirical formulas for external loads of structures through engineering measurements for structural design and reliability analysis. However, in many cases, it is difficult to accurately measure these loads due to the limitation of sensor technology, but the structural response information such as strain and acceleration is easy to measure. In this case, it is necessary to determine the external dynamic load through the structural response through the load identification method. [0003] The traditional dynamic load identification me...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F30/17G06F17/16
CPCG06F30/23G06F30/17G06F17/16
Inventor 吴邵庆郑屹李彦斌费庆国
Owner SOUTHEAST UNIV
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