Method for improving the inherent vibration frequency of a mechanical structure

A technology of natural vibration frequency and mechanical structure, applied in the field of machinery, can solve the problem that the natural frequency of modal vibration does not give a clear method, etc.

Pending Publication Date: 2019-05-31
UNIV OF SHANGHAI FOR SCI & TECH +1
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Problems solved by technology

However, the existing literature does not give a clear method for the specific control of the modal natural vibration frequency

Method used

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  • Method for improving the inherent vibration frequency of a mechanical structure
  • Method for improving the inherent vibration frequency of a mechanical structure
  • Method for improving the inherent vibration frequency of a mechanical structure

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Embodiment Construction

[0029] The method for increasing the natural vibration frequency of the mechanical structure of the present invention comprises the following steps:

[0030] Step 1. Perform a vibration modal test on the mechanical structure, and measure the natural vibration frequency and mode shape of the mechanical structure;

[0031] Step 2: Establish a finite element model of the mechanical structure, and take the natural vibration frequency as the target to optimize the structure so that the frequency of the finite element model is the same as that of the actual mechanical structure;

[0032] Step 3. Use the modal analysis method to study the influence of various factors on the natural vibration frequency of the mechanical structure;

[0033] Step 4. On the basis of the finite element model of the mechanical structure, use the topology optimization method to preliminarily determine the factors that have a greater impact on the natural vibration frequency of the mechanical structure;

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Abstract

The invention discloses a method for improving the inherent vibration frequency of a mechanical structure. The method comprises the following steps of according to the method, subjecting a mechanicalstructure to a vibration mode test; establishing a finite element model and optimizing the rigidity of a connection part, carrying out modal analysis on the finite element model, confirming a relatively large strain energy position of the mechanical structure through topology optimization, DOE test design and modal strain energy analysis, and improving the inherent vibration frequency of the mechanical structure by arranging a beam unit and verifying the inherent vibration frequency of the mechanical structure. According to the method, test testing and theoretical simulation are combined, thestructural rigidity and the main position influencing the inherent vibration frequency of the mechanical structure are determined by carrying out vibration mode testing and size optimization on the mechanical structure, and the beam unit is additionally arranged, so that the effective improvement of the inherent vibration frequency is verified.

Description

technical field [0001] The invention relates to the technical field of machinery, in particular to a method for increasing the natural vibration frequency of a mechanical structure. Background technique [0002] In the field of mechanical vibration research, the effects of natural vibration frequencies on structures have received extensive attention. In mechanical structures, controlling the natural vibration frequency of the structure can effectively avoid the occurrence of resonance, and the natural vibration frequency is closely related to the stiffness of the structure. Therefore, increasing the natural vibration frequency and avoiding structural resonance can be effectively applied in aerospace, automobiles, ships, etc. in many fields. [0003] Modal analysis has been researched and developed for many years. At present, the technology has been developed as an effective method and means to solve practical engineering structural vibration problems in almost all fields su...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 余慧杰丁晓红王海华徐峰王神龙张鑫侃张升吴瑞林
Owner UNIV OF SHANGHAI FOR SCI & TECH
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