Tuned Particle Damping Raft

Abstract

The invention relates to a tuned particle damping floating raft, which solves the problem that the existing floating raft has poor vibration damping effect, must be used in conjunction with a vibration isolator, and the low-frequency vibration damping performance needs to be further improved. The technical solution includes at least two layers of panels and ribs connecting adjacent two layers of panels, and is characterized in that it also includes a plurality of horizontally arranged tuned particle dampers located between adjacent two layers of panels; the tuned particle damper The device is a cylinder, and its bottom surface is fixed on the side wall of the rib. The invention is extremely simple, easy to install, does not change the main structure of the floating raft, effectively improves the vibration damping capability of the floating raft itself, has good low-frequency vibration isolation effect, and can be used independently or in conjunction with a vibration isolator.

Description

technical field [0001] The invention relates to a floating raft vibration isolation device in the field of ships, in particular to a tuned particle damping type floating raft. Background technique [0002] Floating raft vibration isolation devices are widely used in vibration and noise reduction of large ships. There are many mechanical equipment on the upper part of the ship, and the excitation frequency characteristics are complex. Because the size of the raft frame is large, and the weight is limited by the overall ship and cannot be too large, its elastic mode frequency can be as low as the excitation frequency of mechanical equipment, which may cause low-frequency resonance. Therefore, in the past, the design of the raft frame was mainly to optimize its structure so that its elastic mode frequency avoids the excitation frequency of mechanical equipment, but the raft frame itself cannot effectively attenuate the vibration, and the vibration reduction of the floating raft...

AI Technical Summary

Problems solved by technology

However, the structure of the floating raft body still has the following problems: (1) All its structures are rigidly connected, and vibration reduction cannot be achieved independently. Only by cooperating with the air spring installed at the lower end can the purpose of improving the vibration reduction effect be achieved

(2) The structure of the floating raft is still partially changed, so that the area on the floating raft for the installation of the vibration isolation device is reduced; (3) Although it is recorded that the vibration isolation performance can be improved, due to the lack of experimental data, the improvement effect is still insufficient. Clear, and because the raft structure is rigidly connected, its low-frequency vibration isolation effect is not good

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