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A composite material structure impact load identification method and device based on iteration weighting sparsity

A composite material and structural impact technology, applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve the effects of improving recognition accuracy, suppressing amplification, and sparse results

Active Publication Date: 2019-06-25
XI AN JIAOTONG UNIV
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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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  • A composite material structure impact load identification method and device based on iteration weighting sparsity
  • A composite material structure impact load identification method and device based on iteration weighting sparsity
  • A composite material structure impact load identification method and device based on iteration weighting sparsity

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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 term; 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 invention discloses a composite material structure impact load identification method based on iteration weighting sparsity. The method comprises the steps of acquiring a transfer function matrix between a composite material structure impact excitation position and a response measuring point position; Measuring an impact response signal generated by a to-be-identified impact load applied to thecomposite material structure; Constructing an enhanced sparse regularization model based on an lp norm, solving the sparse regularization model by utilizing an iterative weighting l2 norm method, andidentifying an impact load applied to the composite material structure; The invention further discloses a composite material structure impact load identification device based on iteration weighting sparsity. Compared with a Tikhonov method based on an l2 norm, the method has the advantages that the stability is high, and the amplification of measurement noise in an identification result can be inhibited; Compared with a standard sparse regularization method based on l1 norm, the method has the advantages that the identification precision of the peak force of the impact load can be improved, and the result is 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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IPC IPC(8): G06F17/50
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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