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Method for guaranteeing unchanged specific modal frequency of damping system

A modal frequency and damping system technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as the influence of damping without consideration

Active Publication Date: 2018-07-06
SOUTHEAST UNIV
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Problems solved by technology

[0003] The existing method is mainly to correct the undamped system without considering the influence of damping

Method used

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  • Method for guaranteeing unchanged specific modal frequency of damping system
  • Method for guaranteeing unchanged specific modal frequency of damping system
  • Method for guaranteeing unchanged specific modal frequency of damping system

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Embodiment Construction

[0030] A method for ensuring that a specific modal frequency of a damping system remains unchanged, comprising the steps of:

[0031] (1) Determine the modal frequency of the initial structure and the position of the additional mass correction;

[0032] (2) Determine the position information of the spring added to the structure and the order that is expected to ensure that the specific modal frequency remains unchanged;

[0033] (3) Based on the Sherman-Morrison theory, the initial stiffness of the modified spring is obtained, and the actual modified stiffness is obtained by taking the absolute value of the initial stiffness.

[0034] A method to ensure that the specific modal frequency of the damping system remains unchanged, using a six-degree-of-freedom spring-damper-mass system to verify, such as figure 1 As shown, the parameters of the system are respectively: the quality of the mass block is m i =1kg (i=1,2...6), the spring stiffness coefficient is k i =1N / m, (j=1,2.....

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Abstract

The invention discloses a method for guaranteeing unchanged specific modal frequency of a damping system. The method includes (1), determining modal frequency of an initial structure and the positionof added mass correction; (2), determining position information of a spring added to the structure and the order of the unchanged specific modal frequency expected to be guaranteed; (3), performing derivation according to the Sherman-Morrison theory to acquire initial rigidity of the correction spring, and transforming the initial rigidity into an absolute value to acquire corrected rigidity. Themethod has the advantages that the modal frequency with a specific order can be kept unchanged by adding the spring to the structure; for the damping system in actual engineering, the modal frequencywith the specific order can be kept unchanged effectively through spring application under the condition of quality correction, and the method has great engineering significance in structural design.

Description

technical field [0001] The invention relates to the technical field of correction methods, in particular to a method for ensuring that a specific modal frequency of a damping system remains unchanged. Background technique [0002] In structural design, it is sometimes necessary to modify the initial structure of the design, such as adding mass, and the modal frequency of the structure will change at this time. For safety considerations, such as avoiding resonance, etc., or wanting the modal frequency of a specific order of the mass-modified structure to be consistent with the modal frequency of the initial structure, this can be achieved by adding springs to the structure. [0003] The existing method is mainly to modify the undamped system without considering the influence of damping. For the actual damping system, if mass is added to the initial structure, how to determine the stiffness of the added spring to keep the specific modal frequency of the modified structure unc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 费庆国朱锐姜东曹芝腑杭晓晨季熠
Owner SOUTHEAST UNIV
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