Dynamic parameter identification method based on transient signal characteristics of start-stop of rotating machinery

Abstract

The invention discloses a dynamic parameter identification method utilizing the characteristics of the transient signal of the start-stop of the rotating machine, comprising: 1) collecting the vibration signal and the key phase signal during the start-stop process of the rotor; 2) performing the vibration signal collected in step 1). Filtering, the fundamental frequency vibration component that obtains; 3) extract the beat peak point and the beat valley point after the resonance point of the fundamental frequency vibration component obtained in step 2), draw the beat peak point curve and the beat valley point curve respectively, and calculate Draw the mean curve of the beat peak point curve and the beat valley point curve; 4) use the beat peak point curve extracted in step 3) to subtract the mean value curve extracted in step 3) to obtain a vibration amplitude attenuation curve, so as to estimate the system Kinetic parameters. The present invention estimates the system dynamic parameters from the time domain signal by analyzing the vibration signal of the transient vibration signal of the rotor starting and stopping in the vicinity of the critical speed, avoids complex frequency domain sweeping and other methods, and realizes the "online" measurement of the system parameters .

Description

【Technical field】 [0001] The invention belongs to the technical field of rotating machinery, and in particular relates to a method for identifying dynamic parameters of a rotating machinery system. 【Background technique】 [0002] Since large rotating machinery is an important equipment in basic fields such as electric power, petrochemical, aviation, and metallurgy, its safe operation is an important task. With the advancement of industrial technology and the pursuit of production efficiency, the current large-scale rotating machinery is increasingly developing in the direction of high speed and heavy load, all of which have high requirements for the rationality of structural design. When the frequency of the external exciting force is close to the natural frequency of the system, it will cause system resonance, which may affect the normal operation of the machine, and in severe cases, damage the structure of the system and cause accidents. The natural frequency of the syste...

AI Technical Summary

Problems solved by technology

According to mechanical dynamics and rotor dynamics, the rotor system is equivalent to a second-order system, so the differential equation of motion of the second-order system is often used to describe a rotor system. The vibration response signal of the transient process of starting and stopping contains the structural parameters of the system, but There is no effective method in the prior art to extract system structural parameters from the vibration response signal

Images