A line spectrum vibration elimination device and method based on dynamic anti-resonance

Through the dynamic anti-resonance line spectrum vibration cancellation device, using the self-adjusting mechanism and inertial elements, the problem that traditional vibration isolation technology cannot effectively isolate line spectrum vibration is solved, and efficient vibration isolation frequency adjustment and vibration isolation efficiency improvement are achieved.

CN119289018BActive Publication Date: 2025-09-16CHINA SHIP DEV & DESIGN CENT
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Patent Information

Application Number
CN202411723074.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-28
Publication Date
2025-09-16
Estimated Expiration
2044-11-28

AI Technical Summary

Technical Problem

Traditional floating raft vibration isolation technology cannot effectively isolate line spectrum vibrations, resulting in the underwater radiated noise caused by mechanical equipment vibration containing line spectrum components and poor vibration isolation effect.

Method used

A line spectrum vibration cancellation device based on dynamic anti-resonance is adopted. By introducing a self-adjusting mechanism (elastic fin-type actuator), the lever ratio of the vibration isolator is adjusted in real time, so that the vibration isolation frequency coincides with the excitation frequency. The vibration isolation effect is enhanced by combining inertial elements and negative stiffness mechanisms.

Benefits of technology

It realizes automatic adjustment of vibration isolation frequency and amplification of inertial mass, significantly improves vibration isolation efficiency, reduces device weight and enhances vibration isolation effect.

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Abstract

The present invention proposes a line spectrum vibration cancellation device and method based on dynamic anti-resonance, comprising a main mass block, a positive stiffness spring, a base, an inertial element and a self-adjusting element. The upper and lower ends of the positive stiffness spring are respectively fixed between the main mass block and the base. The inertial element comprises a lever and an inertial mass block. The lever is movably clamped and positioned by a flexible hinge mechanism fixed to the main mass block and the base. The inertial mass block is fixed to one end of the lever and connected to the base via a negative stiffness mechanism. The self-adjusting element is fixed to the base and has two fulcrums at the top that contact the lever respectively. The horizontal resultant force acting on the lever drives the lever to move laterally for self-adjustment. The present invention can adjust the lever ratio of the vibration cancellation device in real time according to the excitation frequency, thereby achieving automatic adjustment of the vibration isolation frequency and enhancing the vibration isolation effect while reducing the weight.
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