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A Method for Indirect Acquisition of Continuously Distributed Mechanical Parameter Field of Inhomogeneous Materials

A technology for non-uniform materials and mechanical parameters, which is applied in complex mathematical operations, electrical digital data processing, special data processing applications, etc. Effect

Active Publication Date: 2018-05-11
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide an indirect acquisition method for the continuously distributed mechanical parameter field of non-uniform materials, solve the problem of obtaining mechanical parameters of non-uniform materials, and provide accurate parameters for structural mechanics modeling and analysis using such non-uniform materials

Method used

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  • A Method for Indirect Acquisition of Continuously Distributed Mechanical Parameter Field of Inhomogeneous Materials
  • A Method for Indirect Acquisition of Continuously Distributed Mechanical Parameter Field of Inhomogeneous Materials
  • A Method for Indirect Acquisition of Continuously Distributed Mechanical Parameter Field of Inhomogeneous Materials

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Embodiment

[0045] Embodiment: For a heterogeneous composite material, utilize the technology of the present invention to identify the elastic modulus distribution field E (x) of this material along a certain direction, specifically comprise the following steps:

[0046] 1. Make as figure 2 Composite beams shown, with both ends of the beam clamped by rigid constraints;

[0047] 2. Build a modal test system under hammer excitation, divide the beam into 11 sections evenly, and measure the number of points as follows: image 3 As shown, the modal test is carried out to obtain the test acceleration frequency response function matrix H at each measuring point B (ω), part of the frequency response function curve as Figure 4 shown in .

[0048] 3. Expand the elastic modulus distribution field E(x) of the composite beam along the axial direction by using the Legendre orthogonal polynomial, as shown in the following formula:

[0049]

[0050] Given the initial value of the coefficient of th...

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Abstract

A method for indirectly acquiring a continuous distribution mechanical parameter field of non-homogeneous materials, comprising the following steps: S1, carrying out a non-homogeneous material beam modal test and acquiring a test frequency response function; S2, simulating a continuous distribution mechanical parameter field of materials and establishing a structural dynamics model based on orthogonal polynomial expansion; S3, solving a sensitivity matrix of an acceleration frequency response function relative to an orthogonal polynomial coefficient; S4, identifying an orthogonal polynomial coefficient in a material parameter model based on an optimization algorithm; and S5, reconstructing a mechanical parameter distribution field of the non-homogeneous materials. The method can solve the problem of acquiring mechanical parameters of non-homogeneous materials, and provide accurate parameters for structural mechanics modeling and analysis using the non-homogeneous materials.

Description

Technical field: [0001] The invention relates to an indirect acquisition method for a continuously distributed mechanical parameter field of a non-uniform material, and belongs to the technical field of structural dynamics inverse problems. Background technique: [0002] Composite materials have the advantages of small specific gravity, high specific strength and specific modulus, and are widely used in aerospace, machinery and other fields. However, the molding process of this type of composite material is mostly complicated, and there are often holes, defects, and internal stress in the material, and its macroscopic mechanical properties show characteristics such as non-uniformity. If uniform parameters are used to represent the mechanical characteristics of inhomogeneous materials, it will lead to inaccurate mechanical analysis results, which may cause catastrophic consequences. [0003] The commonly used means to obtain the mechanical parameters of heterogeneous composi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50G06F17/15
CPCG06F17/156G06F30/23G06F2119/06
Inventor 吴邵庆范刚费庆国李彦斌姜东韩晓林
Owner SOUTHEAST UNIV
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