Kinetic parameter identification method utilizing rotary machine start and stop transient signal feature
A technology of rotating machinery and identification methods, applied in measuring devices, instruments, measuring ultrasonic/sonic/infrasonic waves, etc., and can solve problems such as extraction
Active Publication Date: 2015-11-18
XI AN JIAOTONG UNIV
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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
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[0021] The present invention is a system parameter identification method using the characteristics of the transient vibration response signal of the start-stop of the rotating machine, comprising the following steps:
[0022] 1) Collect the rotor start-stop vibration signal and key phase signal;
[0023] 2) filtering the vibration signal collected in step 1) to obtain the fundamental frequency vibration component;
[0024] 3) Extract the beat peak point and beat valley point after the resonance point of the fundamental frequency vibration component in step 2), draw the beat peak point curve and the beat valley point curve respectively, and calculate and draw the beat peak point curve and the beat valley point mean curve of the curve;
[0025] 4) Subtract the mean value curve extracted in step 3) from the beat peak point curve extracted in step 3) to obtain a vibration attenuation curve, so as to estimate the dynamic parameters of the system.
[0026] In step 1), use the eddy...
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The present invention discloses a kinetic parameter identification method utilizing rotary machine start and stop transient signal features. The method comprises a first step of collecting vibration signals and key phase signals in rotor start and stop processes; a second step of filtering the vibration signals collected in the first step to obtain a fundamental frequency vibration component; a third step of extracting beat peak points and beat valley points after a resonance point of the fundamental frequency vibration component obtained in the second step, drawing a beat peak point curve and a beat valley point curve individually, and calculating a mean value curve for drawing the beat peak point curve and the beat valley point curve; and a fourth step of obtaining a vibration amplitude attenuation curve by subtracting the mean value curve extracted in the third step from the beat peak point curve extracted in the third step, thus to estimate kinetic parameters of a system. By analyzing the vibration signals after a critical rotation speed neighboring region of a rotor start and stop transient vibration signal, the kinetic parameters of the system is estimated from time-domain signals, complicated methods such as frequency domain frequency sweep are avoided, and on-line measurement of system parameters is realized.
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...
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Inventor 张西宁吴吉利王奔
Owner XI AN JIAOTONG UNIV