A method for assisting icebreaking of icebreakers based on pitching motion induced by rotating weights

Abstract

The present invention belongs to the field of ship and ocean icebreaking technology, specifically to an assisted icebreaking method for icebreakers based on pitch motion induced by rotating weights. The method employs rotating weights installed at the bow and stern of the icebreaker. These devices can be directly installed on existing vessels without requiring redesign. During continuous icebreaking, the repeated transfer of weights between the bow and stern rotating weights creates an additional pitch angle of 5° to 10°, enhancing the vessel's icebreaking capability.

Description

Technical Field

[0001] The present invention belongs to the technical field of ship and ocean icebreaking, and in particular relates to an auxiliary icebreaking method for an icebreaker based on pitching motion induced by a rotating weight. Background Art

[0002] As global warming accelerates the melting of sea ice, it opens up new possibilities for the opening of Arctic shipping routes and the development of Arctic resources. However, due to the presence of sea ice, icebreaking is a complex issue that will be faced in the upcoming large-scale development of the Arctic. This also places higher demands on the icebreaking capabilities of icebreakers performing pilot missions. The main means of improving icebreaking capabilities is to install auxiliary icebreaking devices on icebreakers. At present, the mainstream auxiliary icebreaking methods include the relatively mature bubble-assisted icebreaking system, the widely used rapid roll system, and the rapidly developing water jet-assisted icebreaking system. Summary of the Invention

[0003] The object of the present invention is to provide an auxiliary icebreaking method for an icebreaker based on pitching motion induced by a rotating weight.

[0004] An icebreaker auxiliary icebreaking method based on rotating weight-induced pitching motion, wherein rotating weight devices are installed at the bow and stern of the icebreaker; the rotating weight devices include weights, a rotating shaft, and a bracket; the bracket is installed on the deck of the icebreaker; one end of the rotating shaft fixes the weights, and the other end is connected to the bracket, and the connection point between the rotating shaft and the bracket is located outside the deck of the icebreaker; in the initial state, the angle between the rotating shaft and the bracket in the bow rotating weight device is 180 degrees, and the angle between the rotating shaft and the bracket in the stern rotating weight device is 0 degrees;

[0005] During the continuous icebreaking process, the icebreaker first generates a continuous icebreaking elevation angle by itself, and then controls the bow rotating weight device and the tail rotating weight device at the same time in a short period of time, so that the angle between the rotating shaft and the bracket in the bow rotating weight device rotates from 180° to 0°, and the angle between the rotating shaft and the bracket in the tail rotating weight device rotates from 0° to 180°, the center of gravity of the icebreaker moves toward the stern, and the icebreaker generates an additional elevation angle on the basis of the continuous icebreaking elevation angle; when the bow of the icebreaker begins to land, the bow rotating weight device and the tail rotating weight device are controlled at the same time in a short period of time, so that the angle between the rotating shaft and the bracket in the bow rotating weight device rotates from 0° to 180°, and the angle between the rotating shaft and the bracket in the tail rotating weight device rotates from 180° to 0°, the center of gravity of the icebreaker moves toward the bow, and the icebreaker generates an additional depression angle, so that the icebreaker generates greater pressure in the process of using the bow to crush the ice layer.

[0006] Furthermore, the bow rotating weight device and the tail rotating weight device use the same weight and rotating axis; during the continuous icebreaking process, by repeatedly executing the weight transfer process between the bow rotating weight device and the tail rotating weight device, the icebreaker produces an additional 5° to 10° pitch angle.

[0007] Furthermore, the length l of the rotating shaft in the rotating weight device and the mass m of the weight satisfy:

[0008]

[0009] Where Δ is the current displacement of the icebreaker; The longitudinal stability of the icebreaker is high.

[0010] Furthermore, the time taken for the angle between the rotation axis and the bracket to rotate from 0° to 180° or from 180° to 0° is no more than 2s.

[0011] The beneficial effects of the present invention are:

[0012] The rotating weight device of the present invention can be directly installed on existing ships without redesigning the ship. By transferring weights between the bow and stern rotating weight devices, the present invention enables the icebreaker to generate an additional 5° to 10° pitch angle, thereby improving the icebreaking capability of the icebreaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the rotating weight device.

[0014] Figure 2 Schematic diagram of the additional elevation angle generated when an icebreaker comes into contact with the ice.

[0015] Figure 3 Schematic diagram of generating additional depression angle for icebreaker during icebreaking process.

[0016] Reference numerals: bracket 1 , rotating shaft 2 , weight 3 , control system 4 . DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] The present invention provides an assisted icebreaking method for icebreakers based on pitching motion induced by rotating weights. Rotating weight devices are installed at the bow and stern of the icebreaker. The rotating weight devices include weights, a rotating shaft, and a bracket mounted on the deck of the icebreaker. The weights are fixed to one end of the rotating shaft and connected to the bracket at the other end, with the connection point between the rotating shaft and the bracket located outside the deck of the icebreaker. By installing rotatable weights at the bow and stern of the icebreaker, the present invention continuously changes the position of the icebreaker's center of gravity by rotating the weights, inducing pitching motion to achieve assisted icebreaking.

[0019]

[0020] Where Δ is the current displacement of the icebreaker; is the longitudinal metacentric height of the icebreaker; l is the length of the rotating shaft in the rotating weight device; m is the mass of the weight; α is the pitch angle of the icebreaker; θ1 is the angle between the rotating shaft and the bracket before the weight rotates, and θ2 is the angle between the rotating shaft and the bracket after the weight system rotates.

[0021] In the initial state, the angle between the rotating shaft and the bracket in the bow rotating weight device is 180°, and the angle between the rotating shaft and the bracket in the tail rotating weight device is 0°; in the continuous icebreaking process, the continuous icebreaking elevation angle is first generated by the icebreaker itself, and then the bow rotating weight device and the tail rotating weight device are controlled at the same time, so that the angle between the rotating shaft and the bracket in the bow rotating weight device rotates from θ1 = 180° to θ2 = 0° within 2s, and the angle between the rotating shaft and the bracket in the tail rotating weight device rotates from θ1 = 0° to θ2 = 180° within 2s, and the center of gravity of the icebreaker moves toward the stern. On the basis of the continuous icebreaking elevation angle, an additional elevation angle is generated to obtain a larger contact area with the ice layer; when the bow of the icebreaker begins to land, the bow rotating weight device and the tail rotating weight device are controlled simultaneously in a short period of time, so that the angle between the rotating shaft and the bracket in the bow rotating weight device rotates from θ1=0° to θ2=180° within 2s, and the angle between the rotating shaft and the bracket in the tail rotating weight device rotates from θ1=180° to θ2=0° within 2s. The center of gravity of the icebreaker moves toward the bow, and the icebreaker generates an additional depression angle, so that the icebreaker generates greater pressure in the process of using the bow to crush the ice layer.

[0022] The bow rotating weight device and the tail rotating weight device use the same weight and rotation axis. During the continuous icebreaking process, by repeatedly performing the weight transfer process between the bow rotating weight device and the tail rotating weight device, the icebreaker will generate an additional pitch angle of 5° to 10°. The length l of the rotation axis in the rotating weight device and the mass m of the weight meet the following requirements:

[0023]

[0024] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An assisted icebreaking method for an icebreaker based on pitching motion induced by a rotating weight, characterized by: A rotating weight device is provided at the bow and stern of the icebreaker; the rotating weight device comprises a weight, a rotating shaft and a bracket; the bracket is installed on the deck of the icebreaker; the weight is fixed at one end of the rotating shaft, and the other end is connected to the bracket, and the connection point between the rotating shaft and the bracket is located outside the deck of the icebreaker; In the initial state, the angle between the rotation axis of the front rotating weight device and the bracket is 180°, and the angle between the rotation axis of the rear rotating weight device and the bracket is 0°; During the continuous icebreaking process, the icebreaker first generates a continuous icebreaking elevation angle by itself, and then controls the bow rotating weight device and the tail rotating weight device at the same time in a short period of time, so that the angle between the rotating shaft and the bracket in the bow rotating weight device rotates from 180° to 0°, and the angle between the rotating shaft and the bracket in the tail rotating weight device rotates from 0° to 180°, the center of gravity of the icebreaker moves toward the stern, and the icebreaker generates an additional elevation angle on the basis of the continuous icebreaking elevation angle; when the bow of the icebreaker begins to land, the bow rotating weight device and the tail rotating weight device are controlled at the same time in a short period of time, so that the angle between the rotating shaft and the bracket in the bow rotating weight device rotates from 0° to 180°, and the angle between the rotating shaft and the bracket in the tail rotating weight device rotates from 180° to 0°, the center of gravity of the icebreaker moves toward the bow, and the icebreaker generates an additional depression angle, so that the icebreaker generates greater pressure in the process of using the bow to crush the ice layer.

2. The icebreaker auxiliary icebreaking method based on rotating weight-induced pitching motion according to claim 1 is characterized in that: The bow rotating weight device and the tail rotating weight device use the same weight and rotating axis; during the continuous icebreaking process, by repeatedly executing the weight transfer process between the bow rotating weight device and the tail rotating weight device, the icebreaker produces an additional pitch angle of 5° to 10°.

3. The icebreaker auxiliary icebreaking method based on rotating weight-induced pitching motion according to claim 2 is characterized in that: The length l of the rotating shaft in the rotating weight device and the mass m of the weight satisfy: Where Δ is the current displacement of the icebreaker; The longitudinal stability of the icebreaker is high.

4. The icebreaker auxiliary icebreaking method based on rotating weight-induced pitching motion according to claim 3 is characterized in that: The time taken for the angle between the rotating shaft and the bracket to rotate from 0° to 180° or from 180° to 0° is no more than 2s.

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