Experimental testing device and method for vibration contact characteristics of gas turbine blade damper system
A technology for gas turbine blades and contact characteristics is applied in the field of experimental testing devices for vibration contact characteristics of gas turbine blade damper systems, which can solve problems such as insufficient information on friction damping characteristics, incomplete understanding of actual dynamics, etc., and improve accuracy. and reliability effects
Active Publication Date: 2022-07-12
XI AN JIAOTONG UNIV
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Problems solved by technology
[0003] Currently, there are several contact models in the literature that can be used to simulate the contact between the friction damper and the blade root platform; however, the actual dynamics of the blade damper are not fully understood due to the complex nonlinear system constituted by the blade damper. The kinetic information obtained from the experimental data is insufficient to provide sufficient information to understand the frictional damping properties
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[0064] In order to make the purposes, technical effects and technical solutions of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; are some embodiments of the present invention. Based on the embodiments disclosed in the present invention, other embodiments obtained by persons of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0065] On the one hand, most of the existing experiments use ordinary carbon steel and aluminum alloy materials, but do not use real blades and research on their alloy materials, resulting in unreliable test results; on the other hand, the existing experiments are only for their respective working conditions. Measurement studies were carried out, and no suitable proxy model for friction ...
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The invention discloses an experimental testing device and method for vibration contact characteristics of a gas turbine blade damper system. The device comprises: an installation bracket; A load applying device is installed on the board; the piezoelectric force sensor is fixedly installed on the mounting bracket, and each piezoelectric force sensor is connected with an analog part fixture through a signal separator, and a blade root analog part is fixedly installed on the analog part fixture; Friction dampers; centrifugal force loading devices; laser vibrometers; excitation probes for applying step sinusoidal signals in different frequency ranges to gas turbine blades; electromagnetic vibration exciters; eddy current displacement sensors for measuring vibration response signals; many Channel data acquisition system; signal generator and power amplifier. The invention can improve the accuracy and reliability of the experimental test of the vibration contact characteristic of the gas turbine blade damper system.
Description
technical field [0001] The invention belongs to the technical field of metal material dry friction damping mechanism testing, and particularly relates to an experimental testing device and method for vibration contact characteristics of a gas turbine blade damper system. Background technique [0002] In the field of turbomachinery, the use of dry friction device to dissipate the kinetic energy of the blade can achieve the purpose of reducing the blade vibration amplitude and maintaining the safe service of the blade. For example, friction dampers are typically placed at the bottom of gas turbine compressor and turbine blades and are maintained in contact with the root platform of each blade by centrifugal force. If the friction damper is well designed, the vibration of the blade will cause relative motion between the lower part of the blade root platform and the friction damper, which generates friction damping force in contact and partially dissipates the vibration energy. ...
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IPC IPC(8): G01M13/00G01M15/14
CPCG01M13/00G01M15/14Y02T90/00
Inventor 谢永慧刘铸锋朱光亚张荻
Owner XI AN JIAOTONG UNIV