Centrifugal impeller vibration damping test system and method

Abstract

The invention relates to a centrifugal impeller vibration damping test system and method. The test system includes a closed loop system in which a to-be-tested centrifugal compressor is located and awireless receiving gateway. The surface of a centrifugal impeller of the centrifugal compressor is provided with a strain sensor used for measuring the blade strain. The front shaft end of the centrifugal impeller is provided with a wireless emitter which is connected to the strain sensor through a data line and emits strain signals to the wireless receiving gateway. The wireless emitter synchronously rotates with the centrifugal impeller. The wireless emitter is connected to the shaft end of the centrifugal impeller and synchronously rotates with the centrifugal impeller. Therefore, the disadvantages of a conventional wired data transmission technologies that the wiring is complex and the reliability of the structure is low. The test system and method are beneficial to the improvement ofthe operational reliability and structural stability of the test system.

Description

technical field [0001] The invention belongs to the technical field of compressors, and in particular relates to a centrifugal impeller vibration damping test system and method. Background technique [0002] During the operation of modern industrial centrifugal compressors, the forced vibration induced by airflow excitation is an important factor leading to the fatigue damage of centrifugal impellers. In order to accurately predict the forced response characteristics of the centrifugal impeller, the complete mechanical parameters of the impeller components should be obtained, and the damping parameters are key data that are difficult to obtain, and the aerodynamic damping is the key to determining the aeroelastic stability. For the operation of advanced turbomachinery For health assessment issues, obtaining vibration damping data is the focus that must be paid attention to. The blades and discs of the centrifugal impeller are often processed in one piece, and the mechanical...

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Problems solved by technology

[0003] It is difficult to directly measure the vibration damping data of the rotating impeller in actual operation. It can only be calculated from the vibration response data of the rotating impeller according to the structural dynamic equation.

Due to the high-speed rotation of the impeller, the primary problem to be solved is to transmit the vibration response signal of the impeller surface in the casing to the external terminal. In the existing technology, a conductive slip ring is often used to lead the data line on the surface of the rotating hub from the shaft end of the impeller. This technology Wired transmission is adopted, the wiring at the shaft end is complicated, and the structural reliability is low

At the same time, the impeller damping data obtained under the measured conditions is the total damping including material damping and aerodynamic damping. How to extract the aerodynamic damping from the measured damping data has not yet been found to be a simple and feasible method

In addition, the aerodynamic damping of the impeller changes due to different vibration modes and working conditions, so far no testing system and method for extracting the aerodynamic damping characteristics of the impeller has been proposed

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