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Statistical energy analysis parameter acquisition method based on finite element method and power input method

A technique of statistical energy analysis and finite element method, applied in the field of statistical energy analysis, to achieve the effect of solving limitations

Active Publication Date: 2017-06-13
SOUTHEAST UNIV
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Problems solved by technology

[0004] Purpose of the invention: the purpose of the present invention is to address the deficiencies of the prior art, to provide a statistical energy analysis parameter acquisition method based on the finite element method and power input method, which solves the limitation that the current method can only perform statistical energy analysis for simple structures question

Method used

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  • Statistical energy analysis parameter acquisition method based on finite element method and power input method
  • Statistical energy analysis parameter acquisition method based on finite element method and power input method
  • Statistical energy analysis parameter acquisition method based on finite element method and power input method

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Embodiment

[0039] Example: such as figure 1 As shown, the geometric model of an L-shaped stiffened plate with an included angle of 90° is selected, the plate in the vertical direction is defined as plate 1, and 2 × 2 ribs are arranged on plate 1, and the plate in the horizontal direction is defined as plate 2. The length, width and thickness of board 1 are L 1 × L 2 ×t=1000mm×1000mm×3mm, the length, width and thickness of board 2 are L 1 × L 2 ×t=1000mm×1000mm×10mm, the size of the ribs is 6mm×12mm. The plate material is TA7 titanium alloy, and its material parameters are: elastic modulus of 109.5GPa, density of 4420kg / m 3 , Poisson's ratio is 0.33, and the structural damping is 2%.

[0040] A statistical energy analysis parameter acquisition method based on finite element method and power input method, such as figure 2 As shown, the specific operation is as follows:

[0041] (1) According to figure 1 Structural geometric model, the highest frequency of calculation and analysis ...

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Abstract

The invention provides a statistical energy analysis parameter acquisition method based on a finite element method and a power input method. A finite element model of a structure is established according to a geometric model of the structure, boundary conditions are applied, the finite element model of the structure is subjected to mode analysis, a mode of a system and a rigidity matrix and a mass matrix of a subsystem are obtained, vibration energy of the subsystem and input power of the system are obtained through a power flow model, and statistical energy analysis parameters are obtained through calculation through the power input method. The finite element method and the power input method are combined to obtain the statistical energy analysis parameters of the structure, the calculated rigidity matrix, mass matrix, mode shape and inherent frequency are obtained through the finite element method, the input power and the vibration energy are obtained through calculation through the power flow model, and the input power and the vibration energy are substituted into the power input method for calculation to obtain the statistical energy analysis parameters. According to the method, statistical energy analysis can be carried out aiming at the problem of strong coupling between structures, the limitation about weak coupling assumption between the structures in existing statistical energy analysis is solved, and the method can be popularized to complex structures.

Description

technical field [0001] The invention relates to a statistical energy analysis method, in particular to a statistical energy analysis parameter acquisition method. Background technique [0002] Statistical energy analysis can well describe the average vibration characteristics of each component of the system. It is a powerful tool for structural dynamics analysis and environmental prediction under high-frequency excitation. It has been successfully used in aerospace, ships, automobiles, and construction fields. The analysis parameters of the statistical energy method can be obtained through theoretical analysis, experimental analysis and numerical analysis. Theoretical analysis is usually only applicable to simple systems such as L-shaped and T-shaped connectors, and it is difficult to apply to actual complex systems. Experimental analysis is a more effective way to obtain parameters of statistical energy analysis. However, experimental analysis has the disadvantages of high...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 陈强张鹏李彦斌费庆国吴邵庆
Owner SOUTHEAST UNIV
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