A dynamic similarity test bench and test method for a rotor support system

Abstract

A dynamic similarity test bench and test method for a rotor support system, belonging to the technical field of vibration testing of rotor support systems in large rotating machinery. The driving motor of the present invention is installed on the base, and the coupling is arranged on the power output shaft of the driving motor; the bearing seat is located on the central axis of the power output shaft of the driving motor, the bearing seat is arranged on the base, and the coupling is opposite to the bearing seat. Correspondingly; the eddy current sensor is located between the two sets of bearing seats, and the eddy current sensor is installed on the base through the sensor bracket. The test method includes the following steps: select the prototype rotor support system for research, determine the relevant parameters of the experimental model rotor support system through the relevant parameters of the prototype rotor support system; manufacture and process the model rotating shaft and model turntable for the experiment, and select Equipped with model bearings with corresponding support stiffness; test the model rotor support system, and predict the natural frequency, mode shape and critical speed of the prototype rotor support system through the test results.

Description

technical field [0001] The invention belongs to the technical field of vibration testing of a rotor support system in a large rotating machine, and in particular relates to a test bench and a test method for a dynamic similarity test of a rotor support system based on a dynamic similarity theory. Background technique [0002] As an important part of large rotating machinery such as gas turbines, aeroengines and compressors, the rotor support system has a direct impact on the overall performance of large rotating machinery. Vibration and noise will be generated during the rotation process, which will reduce the service life and work efficiency of the equipment in the slightest, and cause damage to the equipment in severe cases and cause major safety accidents. [0003] At this stage, the vibration test equipment of the rotor support system can only realize the natural frequency test, but cannot test the mode shape. Because the size of the rotor support system is generally lar...

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Problems solved by technology

[0002] As an important part of large rotating machinery such as gas turbines, aeroengines and compressors, the rotor support system has a direct impact on the overall performance of large rotating machinery. Vibration and noise will be generated during the rotation process, which will reduce the service life and work efficiency of the equipment in the slightest, and cause damage to the equipment in severe cases and cause major safety accidents

[0003] At this stage, the vibration test equipment of the rotor support system can only realize the natural frequency test, but cannot test the mode shape. Because the size of the rotor support system is generally large and the critical speed is high, it is very difficult to test the high-order critical speed. However, the existing The vibration test bench of the rotor support system is not perfect enough

[0004] With the increasingly higher requirements for the performance of large-scale rotating machinery, the research and development of large-scale rotating machinery has gradually become a hot spot. For large-scale rotor support systems, their natural frequencies are generally very high. Direct experiments are carried out during the design and research process. The cost is high and the experiment period is greatly extended

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