Non-linear self-tuning pipeline vibration noise semi-active control method and system

Abstract

The invention discloses a nonlinear self-tuning pipeline vibration noise semi-active control method and system, the device and the control method adopt a permanent magnet spring and an electromagnetic spring to replace a traditional spring to provide a novel NES of restoring force, by changing current parameters, the rigidity of a vibration absorber can alternately present pure nonlinearity and weak nonlinearity according to a certain rule, and the rigidity of the vibration absorber is improved. The device can generate the characteristic of targeted energy transfer with a pipeline system, and meanwhile, the energy transferred to the vibration absorber generates shear flow inside through the viscosity of the magnetic liquid, so that shear energy consumption is carried out. According to the nonlinear self-tuning pipeline vibration noise semi-active control method and system, the semi-active control technology and the NES passive control technology are combined to be used for pipeline system three-way vibration control, and the structure has the advantages of being light in weight, flexible to use, wide in damping frequency, better in robustness, good in energy consumption effect and the like.

Description

technical field [0001] The invention belongs to a vibration reduction and energy consumption device in the technical field of vibration control, and in particular relates to a semi-active control method and system for nonlinear self-tuning pipeline vibration noise. Background technique [0002] Vibration damping of mechanical structures is a long-standing problem that has received considerable ongoing attention due to its importance in engineering applications. The radiated noise caused by the vibration of the pipeline system transmitted to the mechanical structure is also an important way for the generation of mechanical noise. [0003] The traditional methods used to control the vibration transmission of the pipeline system include flexible joints, constrained damping layers, elastic supports, etc. Generally speaking, these methods are difficult to effectively control the low-frequency vibration of the pipeline. In addition, the traditional dynamic vibration absorber is a...

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Problems solved by technology

Accordingly, a nonlinear energy sink (Nonlinear Energy Sink, NES) is produced. NES has the advantages of small additional mass, wide vibration suppression frequency range, directional target energy transfer, high reliability, and strong robustness, which can effectively compensate for TMD. Deficiencies in the field of nonlinear vibration, however, the existing nonlinear energy well devices (NES) are all passively controlled, and cannot be adjusted in time according to the characteristics of external excitation and the changes in the vibration characteristics of the pipeline itself. limitation

At present, the active control of pipeline vibration is realized by using electromagnetic, piezoelectric or magnetostrictive material control units. Although the low-frequency vibration of the pipeline can be locally reduced, due to the limitation of cost and power consumption, it is difficult to use it in the pipeline system. difficulty

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