Icebreaker auxiliary icebreaking method based on pitching motion induced by rotating heavy object

Abstract

The invention belongs to the technical field of ship and ocean icebreaking, and particularly relates to an icebreaker auxiliary icebreaking method based on pitching motion induced by a rotating weight. The rotating weight devices are arranged on the head portion and the tail portion of the icebreaker, the rotating weight devices can be directly installed on an existing ship, and the ship does not need to be redesigned. In the continuous icebreaking process, the icebreaker generates an additional pitch angle of 5-10 degrees by repeatedly executing the heavy object carrying process between the head rotating heavy object device and the tail rotating heavy object device, and the icebreaking capacity of the icebreaker is improved.

Description

Technical Field

[0001] The 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 the global climate warms, the melting of sea ice accelerates, bringing more possibilities for the opening of Arctic shipping routes and the development of Arctic resources. However, due to the existence of sea ice, icebreaking is a complex problem that may be faced by large-scale development of the Arctic, which also puts higher requirements on the icebreaking ability of icebreakers performing pilot tasks. The main means to improve icebreaking ability is to install auxiliary icebreaking devices on the icebreaker. 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 arranged 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 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 stern rotating weight device is 0°;

[0005] During the continuous icebreaking process, a 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 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 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 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 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, the icebreaker generates an additional depression angle, and the icebreaker generates greater pressure in the process of crushing the ice layer with the bow.

[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 rotating shaft 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 an existing ship without redesigning the ship. The present invention enables the icebreaker to generate an additional 5° to 10° pitch angle through the weight transfer process between the bow rotating weight device and the stern rotating weight device, 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 is further described below in conjunction with the accompanying drawings.

[0018] The present invention provides an icebreaker auxiliary icebreaking method based on rotating weights to induce pitching motion, wherein rotating weight devices are arranged 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; 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. The present invention installs rotatable weights at the bow and stern of the icebreaker respectively, and continuously changes the position of the center of gravity of the icebreaker by rotating the direction of the weights, thereby inducing the pitching motion of the icebreaker to complete the auxiliary icebreaking function.

[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, and the icebreaker 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 produces an additional pitch angle, so that the icebreaker generates greater pressure in the process of crushing the ice layer with the bow.

[0022] The bow rotating weight device and the tail rotating weight device use the same weight and rotating shaft; in 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. The length l of the rotating shaft in the rotating weight device and the mass m of the weight satisfy:

[0023]

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An icebreaker auxiliary icebreaking method based on pitching motion induced by rotating weights, characterized in that: A rotating weight device is arranged 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, first, a continuous icebreaking elevation angle is generated by the icebreaker itself, and then 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 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 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 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, the icebreaker generates an additional depression angle, and the icebreaker generates greater pressure in the process of crushing the ice layer with the bow.

2. The icebreaker auxiliary icebreaking method based on the pitching motion induced by rotating weights according to claim 1 is characterized by: 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.

Images