Experimental testing device and method for vibration contact characteristics of blade damper system of gas turbine

Abstract

The invention discloses an experimental testing device and method for the vibration contact characteristics of a blade damper system of a gas turbine. The device comprises an installation support; a fixed nipper in which a wheel flange is detachably mounted, wherein the fixed nipper is provided with a load applying device, piezoelectric force sensors are fixedly installed on the installation support, each piezoelectric force sensor is connected with a simulation piece clamp through a signal separator, and a blade root simulation piece is fixedly installed on the simulation piece clamp; a friction damper; a centrifugal force loading device; a laser vibration meter; an excitation probe which is used for applying step sinusoidal signals in different frequency ranges to the gas turbine blades; an electromagnetic vibration exciter; an eddy current displacement sensor which is used for measuring a vibration response signal; a multi-channel data acquisition system; a signal generator and a power amplifier. According to the invention, the accuracy and reliability of the gas turbine blade damper system vibration contact characteristic experiment test can be improved.

Description

technical field [0001] The invention belongs to the technical field of metal material dry friction damping mechanism testing, and in particular 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 vibration amplitude of the blade and maintaining the safe service of the blade. For example, friction dampers are typically placed on the bottom of gas turbine compressor and turbine blades and are held 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 will generate frictional damping force in the contact and partially dissipate the vibrati...

AI Technical Summary

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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