Method and device for impact load identification of composite material structures based on iterative weighted sparse

A composite material, structural impact technology, applied in the direction of instrument, design optimization/simulation, calculation, etc., to achieve the effect of suppressing amplification, sparse results, and improving recognition accuracy

Active Publication Date: 2021-04-13
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this method is prone to lead to "underestimated" impact load identification results, and there is still room for improvement in the sparsity of identification results

Method used

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  • Method and device for impact load identification of composite material structures based on iterative weighted sparse
  • Method and device for impact load identification of composite material structures based on iterative weighted sparse
  • Method and device for impact load identification of composite material structures based on iterative weighted sparse

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Experimental program
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Embodiment approach

[0085] As a preferred implementable solution, the sparse regularization model is:

[0086]

[0087] Among them, H represents the transfer function matrix; f represents the impact load to be identified; Indicates the residual item; means l p Norm regularization term or penalty function term; the value range of norm p is p∈[0,1]; λ is the regularization parameter; n is the data length of the impact load vector f; f i Indicates the i-th element in the load vector f to be identified; ||·|| 2 l representing the vector 2 norm.

[0088] As a preferred implementable solution, the sparse regularization model can be converted into a weighted l 2 Norm model:

[0089]

[0090] Among them, min represents the minimization; H represents the transfer function matrix; f represents the impact load to be identified; y represents the shock response signal; W (k) Represents the weight matrix when the number of iterations is k.

[0091] In one embodiment, such as figure 2 As shown...

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Abstract

The disclosure discloses a method for identifying impact loads of composite material structures based on iterative weighted sparseness, including: obtaining the transfer function matrix between the impact excitation position of the composite material structure and the position of the response measuring point; measuring the impact load to be identified applied to the composite material structure The resulting shock response signal; constructed based on l p Augmented sparse regularization model of the norm and utilizes iteratively weighted l 2 The norm method solves the sparse regularization model and identifies the impact load applied to the composite material structure; the disclosure also discloses an iterative weighted sparse based impact load identification device for the composite material structure. and based on l 2 Compared with the Tikhonov method of norm, the present disclosure has strong stability and can suppress the amplification of measurement noise in the recognition result; and based on l 1 Compared with the standard sparse regularization method of the norm, the present disclosure can improve the recognition accuracy of the peak force of the impact load, and the result is also more sparse.

Description

technical field [0001] The disclosure belongs to the field of health monitoring of composite material structures, and in particular relates to a method and device for identifying impact loads of composite material structures based on iterative weighted sparseness. Background technique [0002] Composite structures, such as commercial aeroengine fan blades and wings, are inevitably impacted by foreign objects such as hail, birds, and maintenance tools during service and maintenance. The undetectable damage caused by impact load is a major threat and hidden danger to the service safety and integrity of composite structures. When the impact load exceeds the impact damage threshold of the composite material structure, a hidden, harmful, undetectable and fatal "internal injury" will be formed inside the composite material structure, and the accumulated damage will damage the integrity and bearing capacity of the composite material structure. hidden dangers, resulting in huge eco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F113/26
Inventor 乔百杰刘军江陈雪峰杨志勃何卫锋
Owner XI AN JIAOTONG UNIV
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