Hydraulic pipeline fluid pulsation attenuation device based on piezoelectric shunt damping technology

Abstract

The invention discloses a hydraulic pipeline fluid pulsation attenuation device based on a piezoelectric shunt damping technology. The middle part of an attenuator is a rectangular sealing cavity; left and right ends of the cavity are respectively provided with an inlet circular tube (1) for flowing in a hydraulic fluid and an outlet circular tube (11) for flowing out the hydraulic fluid; the inlet circular tube (1) and the outlet circular tube (11) partially extend into an attenuator cavity; the upper part and the lower part of the inner surface of the cavity are respectively provided with PVDF (polyvinylidene fluoride) piezoelectric films; and outgoing lines for guiding two surfaces of each PVDF piezoelectric film out of the sealing cavity to form electrical connection with the outer part are arranged on each PVDF piezoelectric film. The hydraulic pipeline fluid pulsation attenuation device utilizes active filtering to attenuate low-frequency pulsation and utilizes passive filtering to attenuate medium-high-frequency pulsation; the active filtering and the passive filtering are combined, so that the original dynamic characteristic of a hydraulic system can be kept, and pulsation attenuation effect can be improved within a relatively wide 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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