High-order rotating blade dynamic similarity test experiment table and test method

Abstract

The invention discloses a high-order rotating blade dynamic similarity test experiment table and a test method, and belongs to the technical field of the blade vibration test experiment. The experiment table disclosed by the invention comprises a base, a rotor driving part, a pneumatic shock excitation part and a data acquisition part, wherein the motor of the rotor driving part is connected with a spindle; a blade disc is sheathed on the spindle; the spindle is fixedly arranged on the base by a bearing pedestal; the total air duct of the pneumatic shock excitation part is communicated with a cylinder; a branch air duct air outlet on the cylinder corresponds to the blade disc; the first eddy current sensor of the data acquisition part is fixedly arranged on the base by a sensor bracket; and a second eddy current sensor is fixedly arranged on the base via a fixed mount. The test method for the high-order rotating blade dynamic similarity test experiment table comprises the following steps: selecting a prototype blade used for research; designing a model blade according to the relevant parameter theory of the prototype blade; manufacturing and processing the model blade used for the experiment; carrying out a static and dynamic kinetics characteristic test on the model blade; and according to a test result, predicting the kinetics characteristic of the prototype blade.

Description

technical field [0001] The invention belongs to the technical field of blade vibration test experiments, in particular to a high-order rotating blade dynamics similarity test bench and a test method based on the dynamics similarity theory. Background technique [0002] As the heart of the aircraft, the performance of the aero-engine directly affects the overall performance of the aircraft. As one of the key components of the aero-engine, blades, in the actual application process, blade vibration and blade vibration fatigue damage failures have always Serious problems faced, while more than 60% of blade failures are caused by vibration. [0003] At this stage, most of the blade vibration test experimental devices are static blade vibration tests or vibration tests of low-order rotating blades. The test frequency is low, the size and space of the blades are limited, and the test content is single. The dynamic characteristics test of the simulated blade under the action of aer...

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Problems solved by technology

[0003] At this stage, most of the blade vibration test experimental devices are static blade vibration tests or vibration tests of low-order rotating blades. The test frequency is low, the size and space of the blades are limited, and the test content is single. The dynamic characteristics test of the simulated blade under the action of aerodynamic force and the test bench with static test and dynamic high-level test functions are not perfect

[0004] With the increasingly higher requirements for the performance of aero-engines, the research and development of large-scale aero-engines has gradually become a hot spot. For larger-sized blades, not only their physical size is large, but their natural frequency is high. Regular shape, directly experimenting with it during the design research process, the cost is high and the experiment cycle is greatly extended

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