Turbine blade margin plate damping test system

Abstract

The invention provides a turbine blade margin plate damping test system which comprises a vibration table, a fixing clamp, a clamping clamp, a turbine blade, a margin plate damper, a strain gauge, an acceleration sensor, a steel cable, a fixed pulley, a force sensor, a spherical hinge support, a lever and a weight. The turbine blades are assembled and installed in mortise structures of the clamping clamps through tenons, the turbine blades, the clamping clamps, the fixing clamps and the vibration table are combined into a rigid body, the margin plate dampers are arranged at the joints of margin plates of the adjacent turbine blades and connected with the steel cables, and the other ends of the steel cables are connected with the force sensors through the fixed pulleys and further connected to the levers. One end of the lever is fixed on the spherical hinge support, the weight is hung at the other end of the lever, so that loading of simulated centrifugal force is realized, a strain gauge is attached to the surface of a blade body of a turbine blade to be tested, and an acceleration sensor is mounted at a blade tip position relative to the turbine blade.

Description

technical field [0001] The application belongs to the technical field of aero-engine design, and in particular relates to a turbine blade edge plate damping test system. Background technique [0002] In the structure of gas turbine engine, turbine blades are in a complex working environment of fluid-solid-thermal coupling, which has high requirements on strength and life. Turbine blades in an unsteady flow field have vibration excitation factors related to casing, stator blades, struts, etc., which can easily induce harmful vibrations and lead to high-cycle fatigue failure of turbine blades. Turbine blades are generally provided with longer extension roots due to cooling needs. On the one hand, this structure increases the cantilever of the turbine blade and weakens its rigidity, which is easy to induce failure. Feasibility improved. The edge plate damper can effectively reduce the vibration response of turbine blades, but due to its complex contact state and load environm...

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