Ship model roll motion excitation device and ship model roll damping measurement method

Abstract

The invention belongs to the field of ship engineering, and in particular relates to a ship model roll motion excitation device and a ship model roll damping measurement method. The excitation device includes a flange for connecting and fixing to the ship model, a guide structure vertically arranged above the flange, a screw slider set arranged on the guide structure, and a rotary drive mechanism arranged on the flange; The sliders in the lead screw slider group can move up and down along the guide structure; the rotary drive mechanism includes a motor arranged at the bottom of the flange and a shaft coupling for connecting the lead screw. The present invention is different from the generation formula of the existing forced rolling motion of the ship model, and does not need to provide an external forced rolling moment for generating the rolling motion, avoiding the difficulty of generating and controlling the external forced rolling moment, and the generating method of the rolling motion is simple and convenient ; The measurement method of the present invention can realize the steady-state rolling motion of different amplitudes only by adjusting the oscillation frequency of the slider within the effective frequency range, and the measurement method is novel and smart.

Description

Ship model roll motion excitation device and ship model roll damping measurement method technical field The invention belongs to the field of ship engineering, be specifically related to a kind of ship model roll motion excitation device and ship model roll damping Measurement methods. Background technique [0002] Roll damping is the hydrodynamic moment of water on the longitudinal axis of the hull when the ship rolls. At present, ship model roll damping There are two types of measurement methods: the free decay test of the model rolling motion and the forced rolling motion test of the ship model. The free decay of the ship model rolling motion is to force the ship model to have an initial static heel angle; after releasing the ship model, at the beginning Under the combined action of the initial static heel angle and the damping moment of water on the roll of the ship model, the rolling motion of the ship model gradually oscillates and attenuates until the static st...

AI Technical Summary

Problems solved by technology

This is a typical device for driving the rolling motion of the ship model in the form of a connecting rod mechanical structure. The biggest feature of the connecting rod mechanism driving the rolling motion of the ship model is that as the rolling angle of the ship model increases, the external moment that maintains a constant amplitude becomes smaller. become more and more difficult, leading to a sharp increase in roll damping measurement error

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