A hydraulic pipeline fluid pulsation damping device based on piezoelectric shunt damping technology

Abstract

The invention discloses a hydraulic pipeline fluid pulsation attenuation device based on piezoelectric shunt damping technology. The middle part of the attenuator (31) is a cuboid sealed cavity, and the left and right ends of the cavity are respectively provided with inlet circular pipes for hydraulic fluid flow. (1) and the outlet pipe (11) that flows out of the hydraulic fluid, the inlet pipe (1) and the outlet pipe (11) extend into the cavity of the attenuator; the upper and lower parts of the inner surface of the cavity are respectively provided with PVDF piezoelectric Thin film, the PVDF piezoelectric film is provided with lead-out wires leading out of the sealed cavity from both sides to form an electrical connection with the outside. The invention utilizes active filtering to attenuate low-frequency pulsation, passive filtering to attenuate medium and high-frequency pulsation, and combines active and passive filtering, which can not only maintain the original dynamic characteristics of the hydraulic system, but also improve the pulsation attenuation effect in a wider frequency band.

Description

technical field [0001] The invention belongs to the field of hydraulic pipeline fluid pulsation control, in particular to a hydraulic pipeline fluid pulsation attenuation device based on piezoelectric shunt damping technology. Background technique [0002] Due to the structural characteristics of the axial piston pump itself and the huge pressure difference that causes the oil to recoil back into the oil cylinder, the plunger pump has both inherent flow pulsation and backflush flow pulsation, and the backflush flow pulsation is the main one. When the flow pulsation output by the pump flows through the hydraulic pipeline, pressure pulsation will be generated due to the existence of throttling ports, valve ports, etc. in the pipeline. The pressure and flow pulsation in the pipeline will induce pipeline vibration and generate noise, thereby reducing the life of hydraulic components and causing catastrophic accidents in severe cases. Therefore, it is of great practical signific...

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Problems solved by technology

With the development of the hydraulic system, the active control method of the hydraulic fluid pulsation studied by the predecessors has also exposed many shortcomings, which are summarized as follows: (1) When the servo actuator is installed, due to the need to produce equal amplitude and phase difference The secondary pulsation wave, which makes the actuator volume larger; and because in the high-pressure hydraulic system, the actuator has to bear a large load, so that its driving voltage or magnetic field strength is very large, which will cause the actuator to overheat (2) Because the high-pressure fluid in the pipeline will increase the rigidity of the pipeline, if the pipeline is to be deformed, a large execution force is required, and the deformation of the pipe wall of the hydraulic system is used to generate pressure pulsation waves. The active control of fluid pulsation is mostly used in low-pressure hydraulic pipeline systems, and it is not suitable for high-pressure hydraulic systems; (3) Although active filtering is effective in eliminating pulsation, the active control system is complex and expensive, so it is currently only in the laboratory Level

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