A Method for Determining the Effective Mechanical Impedance of the Raft Structure of a Floating Raft Vibration Isolation Device

Abstract

The invention provides a method for determining the effective mechanical impedance of a buoyant raft isolation insulating device raft frame structure. The method comprises the steps of: analyzing and acquiring initial calculation parameters of a raft frame structure; calculating a first-order resonant frequency of the raft frame; calculating an equivalent mass of the raft frame; calculating the effective mechanical impedance of the raft frame at a vibration input position of each apparatus. The method can calculate the effective mechanical impedance of a raft frame through quantitative rapid assessment without modeling analysis according to initial design parameters of the raft frame structure under the condition that the design of the raft frame structure is not finalized in a schematic design stage. The method can provide design reference for subsequent detained design of a buoyant raft structure and can guide structure design scientifically and precisely. The method has the advantages of clear design flow, clear operation and high engineering application value. A buoyant raft dynamic characteristic map can be designed according to the method to be promoted and applied in engineering, so that the efficiency of design of a whole structure and acoustic design can be greatly increased.

Description

technical field [0001] The invention relates to the technical field of ship vibration and noise reduction, in particular to a method for determining the effective mechanical impedance of a raft frame structure of a floating raft vibration isolation device. Background technique [0002] The floating raft vibration isolation device is an important measure for the vibration isolation design of mechanical equipment and units on ships and an effective means for underwater radiation noise control, and the raft frame structure for installing mechanical equipment is a key component of the entire floating raft system. Effective mechanical impedance is a very important design parameter in the design of floating raft structures. The effective mechanical impedance of the raft directly affects the vibration isolation effect of the floating raft device, thereby also affecting the vibration and noise level of the overall system. At present, the vibration and noise reduction effects of flo...

AI Technical Summary

Problems solved by technology

In this way, the entire design process needs to continuously modify the model and analyze and calculate, which consumes a lot of manpower and material resources, and at the same time leads to a longer design cycle, and the design method is not very targeted and forward-looking.

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