Optimal design method of embedded piezoelectric branch damping for general blade disk structure
A technology for optimizing design and disk structure, applied in design optimization/simulation, calculation, electrical digital data processing, etc.
Active Publication Date: 2019-01-01
BEIHANG UNIV
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Problems solved by technology
In order to realize this principle, the present invention also solves the problems of the setting of the anisotropic material parameters of the piezoelectric material, the calculation of the electromechanical coupling coefficient of the blisk structure, etc.
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[0069] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.
[0070] The invention discloses an embedded piezoelectric branch damping optimization design method for a general blisk structure, based on a finite element model and analysis technology, and can be completed by using any existing commercial / open source finite element platform. The method includes the following steps: first, establish a finite element model of the blisk structure and input relevant parameters; calculate the potential electric field intensity corresponding to the specified mode; then, limit the quality of the piezoelectric material and optimize the embedded position of the piezoelectric material on the specified component; Finally, the circuit connection mode of the piezoelectric material is designed; and the modal electromechanical coupling coefficient is calculated; under the given amount of piezoelectric material, the arrangement posi...
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The invention discloses an embedded piezoelectric branch damping optimization design method aiming at a universal blade disk structure, belonging to the technical field of aero-engine vibration suppression. Firstly, the finite element model of the first blade-disk sector in the blade-disk structure is established, and the parameters of the embedded piezoelectric branch damping optimization are inputted. Then the periodic boundary conditions are set for analysis, and all the alternate elements of the components on the pre-analysis part are sorted, and projected back to the same components on the first blade disk sector as the pre-analysis part. Replacing the materials of all the alternate units of the components of the first blade disk sector with piezoelectric materials in order, and connecting all the piezoelectric materials of the replaced components into a whole by means of electric circuits; finally, the modal analysis results are extended to the whole blade disk, and the modal electromechanical coupling coefficients of the whole blade disk are calculated. By electromechanical coupling, the damping of the blade disk structure is optimized. The invention realizes batch setting and greatly reduces workload.
Description
technical field [0001] The invention belongs to the technical field of aero-engine vibration suppression, in particular to an embedded piezoelectric branch damping optimization design method for a general blisk structure. Background technique [0002] The blisk structure is a key component of an aero-engine. With the development of engine performance towards high thrust-to-weight ratio and high rotation speed, the working conditions of the blisk structure are becoming more and more stringent. The high-cycle fatigue problem caused by the vibration of the blisk structure has become one of the most important sources of machine failure, which directly affects the structural integrity and working reliability of the engine machine. [0003] Increasing the damping of the blisk structure is one of the main means to suppress its vibration. With the widespread use of the integral blisk structure technology in new aero-engines, the blade and the disc are designed as a whole, although t...
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Login to View More IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23
Inventor 范雨李琳马皓晔田开元
Owner BEIHANG UNIV