Constrained damping layer structure vibration calculation method

A technology of constrained damping and calculation methods, applied in calculation, computer aided design, design optimization/simulation, etc., can solve problems such as wide frequency range of vibration and noise, complex structure, and inability to reflect changes in structural vibration and noise, and improve accuracy , the effect of improving computational efficiency

Inactive Publication Date: 2017-11-21
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology

The existing constrained damping layer calculation methods mostly only care about the first few modal loss factors of the structure, and cannot reflect the vibration and noise changes of the structure in the main frequency range
The actual en...

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  • Constrained damping layer structure vibration calculation method
  • Constrained damping layer structure vibration calculation method
  • Constrained damping layer structure vibration calculation method

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Embodiment Construction

[0031] The method for calculating the structural vibration of the constrained damping layer based on the analysis of modal strain energy and statistical energy proposed by the present invention will be further described below in conjunction with the accompanying drawings and examples.

[0032] The calculation process of the method for calculating the structural vibration of the constrained damping layer based on modal strain energy and statistical energy analysis proposed by the present invention is as follows: figure 1 , figure 2 shown. First, the subsystems of the large structure are divided according to the modal similarity criterion, boundary conditions and material medium properties. Establish the finite element model of the bare plate of the subsystem, calculate the distribution of its modal strain energy, select elements with larger modal strain energy in each mode within the dominant frequency range to lay the constrained damping layer, and determine the layout of th...

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Abstract

The invention discloses a constrained damping layer structure vibration calculation method. Through starting from a constrained damping layer damping and noise reducing mechanism, utilizing damping loss factors in statistical energy analysis to reflect damping effects of constrained damping layers, combining a modal strain energy method and considering frequency-dependent shear modulus and material loss factors of frequency of the constrained damping layers, a vibration calculation method for large-scale constrained damping layer structures is established, so that the forecast evaluation and optimized analysis of the constrained damping layers applied to large-scale structure damping and noise reducing are realized. According to the method, the calculation efficiency is remarkably improved and the vibration simulated analysis of the large-scale constrained damping layer structures can be realized; and the frequency-dependent characteristics of material shear modulus and material loss factors of the damping layers are considered so that the precision of simulated analysis is improved. By utilizing the method, optimized analysis can be carried out on laying positions and structure parameters of the constrained damping layers, the damping and noise reducing effects of the constrained damping layers can be forecasted, and the constrained damping layers can be utilized to carry out vibration and noise control on engineering structures.

Description

technical field [0001] The invention belongs to the technical field of structural vibration control, and specifically relates to a new method for calculating structural vibration of constrained damping layers based on modal strain energy and statistical energy analysis principles, which can be applied to steel bridges or steel-concrete combined beam bridges for constrained damping layers. Theoretical calculation and optimal design of vibration and noise control of large structures. Background technique [0002] Engineering structures vibrate under dynamic loads (wind, vehicles, pedestrians, etc.). Excessive vibration will not only affect the normal use of the structure, but also cause vibration and noise pollution to the surrounding environment. Under the same dynamic load, the vibration and noise generated by the steel structure are often 10-20dB higher than that of the concrete structure, which greatly limits the application of steel structures in practical engineering, e...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/23G06F2119/06
Inventor 刘全民李小珍张迅
Owner EAST CHINA JIAOTONG UNIVERSITY
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