A piezoresistive pressure feedback semi-active broadband shock absorber

Abstract

The invention discloses a piezoresistive pressure feedback semi-active broadband shock absorber which comprises a housing, an upper end cover, a lower end cover, a membrane, a valve seat, an inflation valve, a fixed partition plate, a movable partition plate, an excitation coil, an excitation coil protecting cover, a piezoresistive element, a connector body and an external circuit. The membrane and the movable partition plate divide the space between the upper end cover and the lower end cover of the shock absorber into an air cavity, a magneto-rheological liquid cavity and an oil cavity from top to bottom. The piezoresistive element, the excitation coil and a fixed-value resistor are connected to an external power supply in series. The piezoresistive pressure feedback semi-active broadband shock absorber can perform real-time automatic pressure pulsation feedback according to pressure pulsation change of a shock absorber inlet oil, further change current in the excitation coil and the damping coefficient of magneto-rheological liquid, can absorb broadband pressure pulsation in a hydraulic pump and a hydraulic pipeline and overcomes the defect that a traditional energy accumulator is narrow in shock reduction frequency range.

Description

technical field [0001] The invention relates to the technical field of vibration control of aviation hydraulic pipeline systems, in particular to a piezoresistive pressure feedback semi-active broadband shock absorber. Background technique [0002] In most hydraulic systems, the hydraulic main pump is an axial piston pump. Due to its structural limitations, the high-pressure oil output by this type of pump must have pressure and flow pulsations. The existence of these pressure pulsations, in most cases, is impossible is detrimental to the hydraulic system. [0003] First of all, the pressure pulsation generated by the axial piston pump is the main reason for the vibration of pipelines and structural parts in the hydraulic system, and it is manifested as a complex multi-field fluid-solid coupling vibration. Its vibration characteristics are difficult to predict and control, which seriously affects the hydraulic pressure. The comfort, safety and reliability of the system use,...

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Problems solved by technology

[0011] At present, most of the patents on accumulator vibration reduction with variable parameters to adapt to changing working conditions are based on bladder-type accumulators. Compared with diaphragm-type accumulators, their dynamic response is poor, and it is difficult to meet high The need for frequency damping

In addition, most shock absorbers need to detect high-frequency pulsation or vibration in the system in real time, and assist excellent control algorithms to achieve the ultimate goal. This requires high requirements for sensing and detection components and control algorithms, and it is difficult to implement Big

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