Method and device for controlling fluid excitation vibration in lubricating oil pipeline

Abstract

Embodiments of the present invention provide a fluid excitation vibration control method and device in a lubricating oil pipeline. The method includes: obtaining the peak frequency of the fluid pulsation pressure in the outlet pipeline of the lubricating oil pump. When the absolute value of the difference between the natural frequency or the excitation frequency of the lubricating oil pump is reduced to a preset threshold, then based on the pre-obtained relationship between the long-chain polymer concentration in the lubricating oil pipeline and the peak frequency of the fluid pulsation pressure, determine the lubricating oil pipeline The amount of long-chain polymer that needs to be increased in the pipeline is used to inject long-chain polymer into the inlet pipeline of the lubricating oil pump. According to the measured relationship between the fluid pulsation pressure spectrum in the lubricating oil pipeline and the concentration of long-chain polymers, by increasing the long-chain polymer in the lubricating oil pipeline to change the fluid pulsation pressure spectrum in the pipeline so that the peak frequency avoids the structure of the lubricating oil pipeline The natural frequency of the pump and the excitation frequency of the lubricating oil pump can avoid the system resonance caused by the fluid excitation in the lubricating oil system pipe of the steam turbine.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of fluid-excited vibration in pipes, and more particularly, relate to a method and device for controlling fluid-excited vibration in a lubricating oil pipeline. Background technique [0002] The fluid disturbance caused by the complex structure will cause the lubricating oil to generate strong fluid pulsation in the pipeline. When the main frequencies are close to or consistent, it will cause resonance in the lubricating oil system, reducing the safety and reliability of the system and the quietness of the environment. [0003] Traditional pipeline vibration isolators are suitable for isolating medium and high frequency vibrations, while the peak frequency of fluid excitation in the steam turbine lubricating oil system is low. The effect of traditional vibration isolators on isolating this type of vibration is not obvious. Active vibration control technology is based on the vibration co...

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Problems solved by technology

[0002] The fluid disturbance caused by the complex structure will cause the lubricating oil to generate strong fluid pulsation in the pipeline. When the main frequencies are close to or consistent, it will cause resonance in the lubricating oil system, reducing the safety and reliability of the system and the quietness of the environment

[0003] Traditional pipeline vibration isolators are suitable for isolating medium and high frequency vibrations, while the peak frequency of fluid excitation in the steam turbine lubricating oil system is low. The effect of traditional vibration isolators on isolating this type of vibration is not obvious. Active vibration control technology is based on the vibration control object vibration In response to the data collection results, an excitation force that is the same as the peak frequency of the vibration response and opposite in phase is applied to the vibration control object from the outside to eliminate or weaken the peak value of the vibration response of the pipeline to achieve active vibration control. In order to achieve a beneficial vibration control effect, generally The quality of the exciter is required to be in the same order of magnitude as the quality of the pipeline. Due to the complexity of the pipeline of the steam turbine lubricating oil system, the application cost of the active control technology algorithm is high

None of the existing active and passive vibration control technologies are suitable for the control of fluid-induced vibration in the lubricating oil system of a steam turbine

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