Method for analyzing frequency components of low-frequency vibration of steam turbine generator unit in real time
A steam turbine generator set, low-frequency vibration technology, applied in vibration testing, machine/structural component testing, measuring devices, etc., can solve the problem that the low-frequency vibration frequency components of large steam turbine generator sets cannot be achieved, and the analysis work relies on professionals High-level problems to achieve the effect of ensuring normal operation
Inactive Publication Date: 2012-10-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
Usually, the analysis of low-frequency vibration frequency components of large-scale generator sets is roughly estimated by professionals with certain on-site operation experience through visual inspection of vibration data spectrum diagrams, which brings about the problem that the analysis work is highly dependent on professionals, and cannot be done. Real-time automatic online monitoring, analysis and calculation of low-frequency vibration frequency components of large turbo-generator sets
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[0016] 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.
[0017] figure 1 It is a schematic diagram of the real-time analysis method for low-frequency vibration frequency components of a steam turbine generator set. figure 1 In the above, the shaft relative vibration signal of the turbo-generator set, the rotor speed signal and the key-phase signal are obtained from the monitoring instrument (TSI) configured with the turbo-generator set. A high-speed data acquisition card is inserted into a slot provided by an industrial microcomputer (IPC). According to the requirements of the high-speed data acquisition card, the data acquisition and conditioning equipment processes the shaft relative vibration signal from the generator monitoring instrument (TSI), the rotor speed signal,...
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The invention discloses a method for analyzing frequency components of low-frequency vibration of a steam turbine generator unit in real time in the technical field of rotating machinery vibration state monitoring and failure diagnosis. The method comprises the following steps: acquiring relative vibration data of a shaft which is arranged on the rotor side of the steam turbine generator unit in real time; calculating a vibration frequency sequence from low frequency to high frequency at each acquisition moment and a vibration amplitude sequence corresponding to the vibration frequency from low frequency to high frequency by using a fast Fouier transform frequency spectrum analysis method; intercepting all vibration frequencies which are less than the working speed frequency of the unit and the vibration amplitudes corresponding to the vibration frequency to form a low-frequency vibration frequency sequence and a low-frequency vibration amplitude sequence; fitting 3 data points by utilizing a least square method principle and adopting a quadratic polynomial; acquiring the low-frequency vibration frequency fulfilling the condition, and adding the low-frequency vibration frequency into the low-frequency vibration frequency sequence. By utilizing the method, automatic real-time on-line monitoring and analysis on the frequency components of the low-frequency vibration are realized, and the normal operation of the steam turbine generator unit is ensured.
Description
technical field [0001] The invention belongs to the technical field of vibration state monitoring and fault diagnosis of rotating machinery, and in particular relates to a real-time analysis method for low-frequency vibration frequency components of a steam turbine generator set. Background technique [0002] The low-frequency vibration of the steam turbine generator set during operation is extremely dangerous. If the cause is not dealt with in time and the cause is found out, it is likely to cause serious damage to the equipment. The severe low-frequency vibration of the shaft system of the turbogenerator can cause dynamic and static friction between the rotor and the stator on the seal, bearing bush, blade top and other parts, and the bearing bush will be out of the body, and the mechanical fatigue environment formed by the large alternating stress may induce rotor cracks , has potential harm to the safety and reliability of the unit, and the low-frequency vibration failur...
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IPC IPC(8): G01H17/00G01M7/02
Inventor 宋光雄
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)