Two-stage longitudinal vibration isolation shafting

Abstract

The invention relates to the field of ship propulsion system design, and particularly discloses a two-stage longitudinal vibration isolation shafting which is provided with a propeller, a stern rear bearing, a stern light shell structure, a stern shaft, a stern front bearing, a pressure-resistant body structure, a stern shaft sealing device, a longitudinal vibration isolator, a vibration isolation thrust bearing, a middle shaft, a middle bearing, an elastic coupler, a propulsion motor and the like from the stern to the bow. By arranging the longitudinal vibration isolators and the vibration isolation thrust bearings, the whole shafting forms a two-stage longitudinal vibration isolation system, the mass ratio u of the two-stage vibration isolation system is designed to be 0.5-1, the mass ratio is increased as much as possible during design, the rigidity ratio is designed to be u + 1, and the shafting can have the better vibration isolation effect than a single-stage vibration isolation system at the middle-high frequency band except the second-order inherent frequency, and vibration noise generated by the ship tail propeller-shaft system is reduced.

Description

technical field [0001] The invention relates to the field of ship propulsion system design, in particular to a double-stage longitudinal vibration-isolated shaft system. Background technique [0002] The stern noise problem caused by the vibration of the propeller-shaft system is an important and difficult control point in the field of ship design. When the propeller rotates in an uneven flow field, there is a certain alternating component in the thrust generated by it, which forms a longitudinal excitation force, which affects the shafting system. A certain excitation is generated and transmitted to the hull through the shafting-thrust bearing, causing the hull to vibrate and cause noise. [0003] The traditional shaft system longitudinal vibration control generally adopts the form of single-stage vibration isolation, and the vibration isolation structure is set in the vibration transmission path. Transmission of ties to the hull structure. [0004] However, this longitud...

AI Technical Summary

Problems solved by technology

[0004] However, this longitudinal vibration control design using single-stage vibration isolation has certain design drawbacks: it is only suitable for vibration control of the first-order natural frequency, and its vibration isolation capability is relatively limited, especially for propeller-shaft systems other than the second-order natural frequency The vibration isolation effect in the middle and high frequency bands is more limited

Images