Damping optimization design method, for constraining damping drum, based on modal strain energy method

A modal strain energy and constrained damping technology, applied in computing, mechanical equipment, springs/shock absorbers, etc., can solve the problems of unscientific layout of damping materials and complicated calculation process of damping structure optimization, so as to reduce calculation time and improve The effect of efficiency

Inactive Publication Date: 2014-12-31
CHONGQING UNIV
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Problems solved by technology

[0004] At present, there is also a technology that pastes the damping material on the inner wall of the aero-engine drum to form a constrained damping drum to reduce the vibration of the dam

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  • Damping optimization design method, for constraining damping drum, based on modal strain energy method
  • Damping optimization design method, for constraining damping drum, based on modal strain energy method
  • Damping optimization design method, for constraining damping drum, based on modal strain energy method

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with drawings and embodiments.

[0034] Such as figure 1 The drum shown in the figure uses constrained damping material to suppress the vibration of the drum. The Young's modulus of the drum is 200GPa and the density is 7900Kg / m 3 , Poisson's ratio 0.25; damping layer thickness 0.00005m, Young's modulus 12MPa, density 1200Kg / m 3 , Poisson's ratio 0.495, loss factor 0.5; constrained layer thickness 0.00013m, Young's modulus 70GPa, density 2700Kg / m 3 , Poisson's ratio 0.3. The bolt holes of the drum are fully constrained, and the first-order mode is the focus of attention, and the amount of constrained damping material used is 50% of the full coverage. To optimize the layout of constrained damping materials, the specific steps are:

[0035] 1) Paste the constrained damping material on the inner wall of the aero-engine drum to form the constrained damping drum, establish the finite element model of th...

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Abstract

The invention discloses a damping optimization design method, for constraining a damping drum, based on the modal strain energy method and solves the problem that the vibration stress of an aero engine drum is excessively large. The method includes adhering constraining damping material onto the inner wall of the aero engine drum, constructing a constraining damping drum, establishing a finite element model of the constraining damping drum, and performing modal analysis; determining the usage of the constraining damping material and the concerned modal, extracting the modal strain energy distribution of the damping layer, and determining the arranging position of the constraining damping material according to the usage of the constraining damping material and the strain energy distribution of the damping layer. The arranging position of the constraining damping material is trimmed annularly for the convenience of project implementation. According to the method, on the condition of setting the certain constraining damping material usage additionally, the arranging position of the constraining damping material can be determined rapidly, and the fine damping effect of the constraining damping drum can be achieved.

Description

technical field [0001] The invention relates to a structural optimization design method, in particular to a vibration reduction optimization design method of a constrained damping drum based on a modal strain energy method. Background technique [0002] The damping structure can effectively suppress the vibration and noise of the structure, and is widely used in automobiles, aerospace, ships and other industries. In the traditional vibration reduction design of damping structures, the damping material is covered on the surface of the entire structure, which effectively suppresses structural vibration and noise while increasing the additional mass of the structure. In the traditional vibration damping design, only by optimizing the damping material type, number of layers, and thickness, although a good vibration damping effect can be obtained, it will greatly increase the additional mass of the structure, and it is impossible to achieve the maximum with the minimum amount of ...

Claims

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Application Information

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IPC IPC(8): G06F17/50F16F15/00
Inventor 郑玲房占鹏唐重才李以农
Owner CHONGQING UNIV
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