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Modal strain energy-based damage occurrence judging method

A technology of modal strain energy and modal frequency, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as complex mechanism structure and large calculation cost, and achieve reduced operating costs and sensor individual number effect

Active Publication Date: 2017-08-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0003] However, in actual application, it is found that due to the complex structure of the actual mechanism and the large number of units, the degrees of freedom that can be measured are much smaller than the total degrees of freedom of the finite element model, and the change of the unit modal strain energy calculated by each unit will cause a large Computing costs

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  • Modal strain energy-based damage occurrence judging method
  • Modal strain energy-based damage occurrence judging method
  • Modal strain energy-based damage occurrence judging method

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Embodiment Construction

[0032] The present invention provides a method for judging the occurrence of damage based on modal strain energy. In order to make the object, technical solution and effect of the present invention clearer and clearer, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific implementations described here are only used to explain the present invention, not to limit the present invention.

[0033] Since the finite element model can add damage more conveniently, the embodiment of the present invention uses a finite element model of a rectangular steel plate with a length of 100 mm, a width of 20 mm, and a thickness of 2 mm as the research object to illustrate the rationality and effectiveness of the proposed method. The proof-of-concept is a rectangular steel plate, but not limited to this type of construction and such dimensions. The specific implementation steps of the example are a...

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Abstract

The invention relates to a modal strain energy-based damage occurrence judging method. The method comprises the following steps of: establishing a finite element model for an analysis object; carrying out repeated modal tests on the analysis object, wherein each test can obtain the first five-order modal shapes of the analysis object; obtaining a local rigidity matrix of each unit on the basis of a finite element solver; filling the local rigidity matrix of each unit into a total rigidity matrix to obtain a rigidity contribution value of each unit; respectively solving modal strain energy of each unit in each test; carrying out similarity calculation on a modal strain energy vector obtain in each test and a modal strain energy vector obtained for the first time according to the sequence of the tests, and adding the similarity of each unit. The method is used for judging whether damage occurs or not.

Description

technical field [0001] The invention belongs to the field of structural modeling and evaluation, in particular to a method for judging damage occurrence based on modal strain energy. Background technique [0002] The change of modal strain energy before and after structural damage is one of the more commonly used damage identification algorithms. The mode shape changes locally near the structural damage, so the distribution of the modal strain energy in the structure will change. Therefore, it is possible to identify whether there is damage by comparing the changes in the modal strain energy of each unit. [0003] However, in actual application, it is found that due to the complex structure of the actual mechanism and the large number of units, the degrees of freedom that can be measured are far less than the total degrees of freedom of the finite element model, and the change of the unit modal strain energy calculated by each unit will cause a large Computing costs. [00...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 郭勤涛王子斌展铭
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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