Excitation vibration control method and device for fluid in lubricating oil pipeline

Abstract

The embodiment of the invention provides an excitation vibration control method and device for fluid in a lubricating oil pipeline. The method comprises the steps that fluid pulsating pressure peak frequency of an outlet pipeline of a lubricating oil pump is obtained, if it is judged and learned that the absolute value of the difference value between the fluid pulsating pressure peak frequency andinherent frequency of a lubricating oil pipeline structure or excitation frequency excited by the lubricating oil pump is reduced to the preset threshold value, based on the relation between concentration of long-chain polymer in the lubricating pipeline and the fluid pulsating pressure peak frequency obtained in advance, the amount of the long-chain polymer needing to be increased in the lubricating oil pipeline is determined, and thus the long-chain polymer is injected into the inlet pipeline of the lubricating oil pump. According to the relation obtained by actual measurement between the fluid pulsating pressure frequency spectrum in the lubricating oil pipeline and the concentration of the long-chain polymer, by increasing the long-chain polymer in the lubricating oil pipe, the fluidpulsating pressure frequency spectrum in the pipe is changed to enable the peak frequency of the pipe to avoid the inherent frequency of the lubricating oil pipeline structure or the excitation frequency of the lubricating oil pump, and system resonance caused by excitation of fluid in the pipe of a lubricating oil system of a turbine is avoided.

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...

AI Technical Summary

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

Images