ANN-based gas turbine damping blade structure equivalent stiffness damping analysis method

A technology of equivalent stiffness and blade structure, applied in geometric CAD, computer-aided design, instruments, etc., can solve the problems of inconvenient practical application, cumbersome process, and inability to make full use of the potential commonality of damping models, so as to avoid calculation consumption and speed up accuracy Fitting effect

Pending Publication Date: 2022-04-08
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] On the other hand, the existing evaluation methods of equivalent stiffness and damping have the characteristics of strong experience dependence. Different forms of fitting formulas are required for different contact models, and it is difficult to establish a unified characterization method and modeling tool. Therefore, for new dry friction The calculation of the fitting formula of the dynamic model requires continuous trial and error; at the same time, the existing equivalent stiffness damping evaluation methods cannot make full use of the p

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  • ANN-based gas turbine damping blade structure equivalent stiffness damping analysis method
  • ANN-based gas turbine damping blade structure equivalent stiffness damping analysis method
  • ANN-based gas turbine damping blade structure equivalent stiffness damping analysis method

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[0066] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0067] see figure 1 As shown, it is a flow chart corresponding to the ANN-based equivalent stiffness damping analysis method of gas turbine damping blade str...

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Abstract

The invention discloses an ANN-based gas turbine damping blade structure equivalent stiffness damping analysis method. The method comprises the following steps: 1) establishing a friction-collision dynamic coupling damping model suitable for describing the contact state of a dry friction damping piece; 2) solving a nonlinear forced response of the blade by using a time-frequency interaction algorithm; 3) calculating equivalent stiffness and an equivalent damping coefficient; and 4) building ANN fitting equivalent stiffness and equivalent damping change curves. According to the method, the collision-friction dynamic coupling damping model considering the variable positive pressure is established, meanwhile, curve fitting is conducted through a universal ANN, and extra calculation consumption caused by different fitting formula forms of different dry friction damping models in a traditional method is avoided; in addition, according to the method, the fitting result of the current network is used for guiding generation of other networks by applying a transfer learning method, so that the problems of low fitting efficiency and low fitting precision of a traditional algorithm when variable parameters or sample size is small can be effectively solved.

Description

technical field [0001] The invention belongs to the field of engineering design and calculation, and in particular relates to an ANN-based analysis method for equivalent stiffness and damping of a gas turbine damping blade structure. Background technique [0002] As a key component in modern gas turbines, the turbine blades of gas turbines are often subjected to complex alternating airflow loads, so it is necessary to introduce various dry friction dampers to dissipate the vibration energy of the blades and suppress the occurrence of forced resonance or flutter of the blades. However, this also brings new challenges to the vibration prediction and structural design of the gas turbine damping blade structure. [0003] On the one hand, the contact at the damping part of the dry friction of the blade is localized and time-varying. It is necessary to conduct a reasonable mechanism modeling of the collision friction phenomenon at the damping part to obtain a more accurate contact...

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Application Information

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IPC IPC(8): G06F30/17G06F30/23G06F30/28G06F119/14G06F113/08
Inventor 谢永慧尤佳睿蒋明宏张荻
Owner XI AN JIAOTONG UNIV
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