Testing device for measuring damping vibration reduction effect of turbine movable blade

Abstract

The invention discloses a test device for measuring the damping vibration reduction effect of a turbine movable blade, and belongs to the technical field of turbine movable blade testing. The testingdevice includes a first loading mechanism for applying a centrifugal load to the blade portion of the turbine movable blade, a second loading mechanism for applying a centrifugal load to the damping part of the turbine movable blade, a vibration mechanism for providing vibration, a clamp for clamping the blade and an acceleration sensor for measuring the vibration effect. The loading device can guarantee that two loading mechanisms are independent from each other when carrying out loading work, and no coupling phenomenon occurs, and the problem of damping measurement under the working state ofthe existing turbine movable blade can be solved, the technical support is provided for design and research of the movable blade damping of the engine, and a guarantee is provided for the research ofthe safety and reliability of the engine.

Description

technical field [0001] The invention belongs to the technical field of turbine rotor blade testing, in particular to a test device for measuring the damping and vibration reduction effect of turbine rotor blades. Background technique [0002] Due to the harsh working environment of the turbine rotor blades, the large aerodynamic force and unstable excitation load, in order to avoid the resonance caused by the forced vibration of the blades, the method of increasing damping is adopted to suppress the response of the blades and reduce the vibration stress. Therefore, It is necessary to study the influence of the damping block on the vibration characteristics of the blade when the blade is subjected to centrifugal force, that is, the vibration reduction effect of the damping block needs to be studied. [0003] Existing tests on the damping and vibration reduction effect of turbine rotor blades can only fix the loading device on the ground and use a hammer or vibrator for excita...

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Problems solved by technology

[0003] Existing tests on the damping and vibration reduction effect of turbine rotor blades can only fix the loading device on the ground and use a hammer or vibrator for excitation, which cannot be installed on a high-frequency vibration table, so the work of turbine rotor blades and damping cannot be simulated Under load and working state, it is impossible to avoid the impact of the additional mass and additional stiffness of the hammer or vibrator on the test results by using the existing test method to measure the damping of the turbine blade, and it is impossible to obtain a more in line with the actual working state. The damping effect of turbine blades is not conducive to the design and research of engine turbine blade damping

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