Pipeline vibration active control system with band gap characteristic

Abstract

The invention discloses a pipeline vibration active control system with a band gap characteristic, and belongs to the technical field of vibration control in the field of machinery. The system adoptsthe band gap characteristic of a periodic structure and an intelligent damping material to control pipeline vibration. The system comprises a pipeline, a piezoelectric sensor, a signal conversion unit, an upper computer, an active controller, a voltage amplifier, a viscoelastic damping layer and piezoelectric ceramic, wherein the viscoelastic damping layer is periodically attached to the outer wall of the controlled pipeline. The piezoelectric sensor receives a vibration signal of the pipeline, the vibration signal is input to the active controller and the upper computer through the signal conversion unit to be calculated to obtain a feedback signal, the feedback signal is transmitted to the piezoelectric ceramic piece attached to the outer wall of the controlled pipeline through the voltage amplifier, and the piezoelectric ceramic piece deforms to enable the viscoelastic damping material to generate shear deformation. Due to the band gap characteristic of the periodic structure, the propagation of vibration of a specific frequency is attenuated in the structure. The two effects are combined to reduce the vibration amplitude of the pipeline.

Description

technical field [0001] The invention belongs to the application technical field of pipeline system vibration control, and relates to a pipeline vibration active control system with band gap characteristics. Background technique [0002] Hydraulic pipelines are important energy and material delivery channels in hydraulic systems. With the development of industrial modernization, the performance requirements of the hydraulic system are getting higher and higher, and higher requirements are put forward for the reliability and stability of the pipeline. [0003] Due to the existence of the pump source in the hydraulic system and the connection form between the pipeline and the structural matrix, it is determined that the pipeline will be excited by the pressure pulsation from the pump source fluid and the broadband foundation excitation of the structure when it is working. When the excitation frequency is close to the modal frequency of the pipeline, the resonance of the pipeli...

AI Technical Summary

Problems solved by technology

Although it has the advantages of clear vibration reduction mechanism, simple structure, and no energy input, but its control frequency range is narrow, the effect of high frequency vibration reduction is good, low frequency control is not good, and the control parameters cannot change with the excitation environment.

Although the traditional active control technology has improved the control effect at low frequencies, it has limited control effects at high frequencies and when the vibration energy is large

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