Novel variable-rigidity semi-active pipeline vibration absorber

Abstract

The invention provides a novel variable-rigidity semi-active pipeline vibration absorber which comprises a circular clamping ring and a main vibration absorber body. The novel variable-rigidity semi-active pipeline vibration absorber is characterized in that the main vibration absorber body comprises four sub vibration absorber bodies symmetrically arranged on the outer surface of the circular clamping ring; each sub vibration absorber body comprises two leaf springs, an inertia mass block and laminated polyvinylidene fluoride (PVDF) actuators arranged on the upper surface and the lower surface of each leaf spring; and a flat ring structure is formed after the two leaf springs of each sub vibration absorber body are in butt joint, one end of the flat ring structure is connected with the circular clamping ring, and the other end of the flat ring structure is connected with the inertia mass block. The novel variable-rigidity semi-active pipeline vibration absorber is convenient to install, simple in structure, high in reliability and wide in applicable frequency band range, the frequency of the vibration absorber can be adjusted according to the change of the pipeline vibration frequency, and therefore the requirements for vibration reduction and noise reduction of pipelines are met. The novel variable-rigidity semi-active pipeline vibration absorber is valuable particularly in meeting the acoustic stealth requirement of pipeline systems of modern ships and submarines.

Description

technical field [0001] The invention relates to a vibration absorber, in particular to a novel variable stiffness semi-active pipeline vibration absorber, which belongs to the field of vibration absorbers. Background technique [0002] Ships and submarines have complex piping arrangements. Piping also provides a path for the transmission of vibration and noise. Mechanical equipment can transmit vibration and noise to the ship structure through the pipeline system; secondly, when equipment such as sea water pumps work, it will inevitably cause the pressure and flow pulsation of the liquid in the pipe to cause pipeline vibration, reduce the service life of the pipeline, and affect Crew comfort, reducing the ship's "acoustic stealth" performance. [0003] The vibration and noise source suppression of the ship pipeline system can be started from two aspects. One is to reduce the transmission of various power mechanical equipment vibrations to the pipeline, and vibration isolat...

AI Technical Summary

Problems solved by technology

"Frequency Adjustable Pipeline Vibration Absorber" (Patent No.: CN 204201363 U) can suppress and absorb the vibration of the pipeline direction, and can artificially adjust the position of the inertial mass on the spring leaf, and adjust the actual use stiffness of the spring leaf. In order to adjust the natural frequency of the vibration absorber, this kind of vibration absorber works well for the pipeline system with stable working conditions, but once it encounters complex and changeable working conditions, the efficiency of the vibration absorber will decrease, and it cannot be adjusted according to the vibration frequency of the pipeline The change adjusts its own natural frequency

Wang Zhen (Wang Zhen, Research on Active Vibration Control of Piping System Based on Inertial Actuator, Master's Thesis of China Naval Academy, 2014) designed an electromagnetic inertial vibration absorber, which can actively control the vibration in one direction of the pipeline. Control, the vibration absorber is applied to the low-frequency vibration control of the pipeline, but the vibration of the pipeline is circumferential. Obviously, it is only controlled from one direction, which cannot well deal with the vibration impact of the complex fluid in the pipeline on the pipe wall.

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