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A Shafting Torsional Vibration Extraction Method

An extraction method and shafting torsional vibration technology, which is applied to measuring devices, instruments, and measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of high requirements for testing equipment and high cost, and achieve the effect of reducing the cost of testing and measurement

Inactive Publication Date: 2011-12-21
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Literature (Journal of Sound and Vibration, 1996, 190 (3): 399-418) utilizes the Doppler effect of laser to carry out the torsional vibration test, in the above-mentioned torsional vibration test method, not only the requirements for the test equipment are relatively high, but also the cost is relatively high. Big

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  • A Shafting Torsional Vibration Extraction Method
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  • A Shafting Torsional Vibration Extraction Method

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Embodiment Construction

[0028] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0029] Provide the best embodiment of the present invention below in conjunction with accompanying drawing:

[0030] (1) First record the terminal voltage of the circuit when the subsynchronous resonance occurs under the continuous impact of the power grid. When subsynchronous resonance occurs, the magnitudes of voltage and current increase significantly. Voltage signal such as figure 1 shown.

[0031] (2) Select the voltage signal in the oscillation process. The effect of electromechanical coupling causes amplitude modulation of the voltage signal, and the frequency of the modulation signal is the torsional vibration frequency of the shafting. Intercept modulated signals such as figure 2 shown.

[0032] (3) Us...

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Abstract

The invention discloses a shafting torsional vibration extraction method in the technical field of vibration signal processing. In the method, voltage signals of a circuit loop under the electric network impact are firstly collected, voltage signals during the shafting torsional vibration generation in the voltage signals are intercepted, then, Hilbert conversion is utilized for obtaining signal enveloping, ensemble empirical mode decomposition (EEMD) is carried out on enveloped signals, and finally, decomposed intrinsic mode function (IMF) is selected to obtain shafting torsional vibration signals. The method has the advantages that special torsional vibration testing equipment is not needed, only the voltage signals of the circuit loop need to be collected, and the testing measurement cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of vibration signal processing, and in particular relates to a shafting torsional vibration extraction method. Background technique [0002] Some faults and operating modes in the power system may cause torsional vibration (torsional vibration) of the shafting of the turbogenerator, which in turn may cause fracture or fatigue damage of certain sections of the shafting or couplings due to excessive torsional stress. At present, people have a relatively mature understanding of the mechanism of torsional vibration, and have achieved fruitful results in the testing of the inherent characteristics of torsional vibration in shafting, the development of torsional vibration monitoring systems, and theoretical analysis of torsional vibration. However, for large-scale electromechanical coupling systems, especially steam turbines, most of the torsional vibrations are caused by the short-term impact and transient proces...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H11/06
Inventor 向玲马万里张超胡爱军唐贵基孙浩王子瑞
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)