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

A composite material, structural impact technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of underestimation, unstable solution, low recognition accuracy, etc., to achieve sparse results, strong stability, and improved The effect of recognition accuracy

Pending Publication Date: 2019-06-25
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] In view of the above problems, the purpose of the present disclosure is to provide a method for identifying impact loads of composite material structures based on reinforced sparseness, which can solve the problem based on l 1 Norm of the standard sparse regularization method "underestimation" of the technical problem, and to solve the traditional l-based 2 The regularization method of norms identifies technical problems with low recognition accuracy and unstable solutions

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  • A composite material structure impact load identification method and device based on enhanced sparsity
  • A composite material structure impact load identification method and device based on enhanced sparsity
  • A composite material structure impact load identification method and device based on enhanced sparsity

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Embodiment Construction

[0054] Attached below Figure 1 to Figure 4(d) The technical solutions of the present disclosure will be described in detail with the examples, and the following examples are only illustrative and not intended to limit the present disclosure.

[0055] see figure 1 , a method for identifying impact loads of composite material structures based on enhanced sparseness, including the following steps:

[0056] S100: Obtain the transfer function matrix between the impact excitation position and the response measurement point position of the composite structure;

[0057] This step is achieved through the following process:

[0058] S101: Obtain a frequency response function H(ω);

[0059] The frequency response function H(ω) can be obtained in two ways: one is to use the hammering method to measure the frequency response function H(ω) between the impact excitation position of the composite structure and the position of the response measuring point; the other is to establish the com...

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Abstract

The invention discloses a composite material structure impact load identification method based on enhanced sparsity. The method comprises the steps of obtaining 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 the compositematerial structure; And constructing an enhanced sparse regularization model based on the lp norm, solving the enhanced sparse regularization model by utilizing an iterative weighting l1 norm method,and identifying the impact load applied to the composite material structure. The invention also discloses a composite material structure impact load identification device based on enhanced 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 enhanced sparseness. Background technique [0002] For composite structures, undetectable damage caused by impact loads is one of the major threats and hidden dangers that constitute structural safety. Composite structures, such as commercial aeroengine fan blades and wings, are inevitably impacted by foreign objects such as hail, flying birds, and maintenance tools during service and maintenance. When the impact load exceeds the impact damage threshold of the composite material structure, a hidden, harmful and undetectable fatal "internal injury" will be formed inside the structure, and the accumulated damage will cause hidden dangers to the integrity and bearing capacity of the composite material structure , resulting in huge economic losses ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 乔百杰陈雪峰杨志勃刘金鑫张兴武
Owner XI AN JIAOTONG UNIV
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