Ship propeller excitation force friction reduction device

Abstract

The invention relates to a ship propeller excitation-force friction reduction device. The ship propeller excitation-force friction reduction device comprises a propeller and a damping treatment device installed at the end part of a propeller hub. The damping treatment device comprises a friction damping ring, a pressing plate and a fastening part. The friction damping ring is of an annular circular truncated cone structure. The pressing plate is of an annular circular column structure. A cone surface groove which is matched with the shape of the friction damping ring is formed in the end part of the propeller hub in the axial direction. The cone surface groove comprises a cone surface and an end surface. The depth of the cone surface groove is greater than the thickness of the friction damping ring. The friction damping ring is stored in the cone surface groove. A certain gap is formed between the small end surface of the friction damping ring and the end surface. The pressing plate covers the outer side of the friction damping ring and is connected with the propeller hub through the fastening part. According to the ship propeller excitation-force friction reduction device, the damping treatment device is not in direct contact with propeller blades, and the hydrodynamic performance of the propeller cannot be impacted; and the damping treatment device cannot directly make sound ,vibration of the propeller blades can be attenuated, and sound making-directly of the propeller can be reduced.

Description

technical field [0001] The invention relates to the technical field of vibration reduction and noise reduction, in particular to a friction reduction device for suppressing the transmission of excitation force of a propeller of a ship. Background technique [0002] The propeller is one of the important propulsion methods of the ship. Since the propeller works in a non-uniform and unsteady wake field, the propeller will generate periodic and random pulsating thrust while generating the average thrust. These pulsating thrusts will excite the entire ship to vibrate through the propulsion shafting, and the It has a greater impact on the comfort and quietness of the car. Generally speaking, it is hoped to manufacture propellers with high stiffness, high input impedance, and high damping. High stiffness and high input impedance can effectively increase the natural frequency of the propeller and suppress the vibration of the propeller. High damping can significantly reduce the cou...

AI Technical Summary

Problems solved by technology

[0004] The existing propeller excitation force suppression has the following limitations: a) when damping treatment is performed on the propeller blades, it is easy to affect the hydrodynamic performance of the propeller and deteriorate the wake field at the propeller; b) the propeller excitation force on the elastic shafting When suppressing, the excitation force of the propeller has been amplified before suppressing; c) In the case of small vibration and limited interface size, it is difficult to design a device that can consume energy, reduce blade vibration and its transmission

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