Ship parameter rolling online early warning method and device

Abstract

The present invention discloses an online early warning method and device for ship parameter roll, wherein the online early warning method for ship parameter roll comprises: scanning the waves in the sea area around the ship by radar to obtain wave field information; predicting the wave information reaching the hull based on the radar scanning results; calculating the motion response of the hull using the predicted wave information to obtain a theoretical motion response; measuring the hull motion by a motion sensor installed on the hull to obtain a measured motion response; comparing the measured motion response with the theoretical motion response; and issuing an early warning if the measured motion response does not match the theoretical motion response. The present invention has a distinct instantaneous characteristic for parameter roll, can accurately predict the occurrence of ship parameter roll, has the advantages of accuracy and timeliness, and realizes an online early warning of the ship parameter roll phenomenon.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to an online early warning method and device for ship parameter rolling. Background Art

[0002] Parametric roll is a nonlinear mechanical phenomenon that occurs in large-scale drift vessels, such as container ships, car carriers, and passenger ships. It is characterized by significant, large-scale roll motions occurring when facing or following waves (normally, facing or following waves does not cause large-scale roll motions, while large-scale roll motions mainly occur in transverse waves). When parametric roll occurs, the roll angle can reach over 20 degrees, seriously affecting the safety of ship operations and causing cargo losses and shipwrecks.

[0003] Currently, ship parametric roll prediction systems are primarily based on route weather forecasts, determining whether parametric roll will occur based on the period and direction of the route's waves. The accuracy of these methods depends on the accuracy of the weather forecast. Parametric roll exhibits a distinct instantaneous nature, making it difficult to predict the occurrence of a transient phenomenon using a forecast spanning several hours.

[0004] The existing ship parameter roll prediction system cannot effectively solve the problem of ship parameter roll prediction. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art and provide an online early warning method and device for ship parameter rolling.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] A ship parameter rolling online early warning method, comprising:

[0008] Scan the waves in the sea area around the ship through radar to obtain wave field information;

[0009] According to the radar scanning results, the wave information reaching the hull is predicted;

[0010] The predicted wave information is used to calculate the motion response of the hull and obtain the theoretical motion response; the motion of the hull is measured by the motion sensor installed on the hull to obtain the measured motion response;

[0011] Compare the measured motion response with the theoretical motion response;

[0012] If the measured motion response does not match the theoretical motion response, an early warning is issued.

[0013] Furthermore, the radar is an X-band radar.

[0014] Furthermore, the step of predicting the wave information arriving at the hull based on the radar scanning results includes: constructing a wave field mathematical model based on the radar scanning results, applying a wave propagation model, and predicting the wave information arriving at the hull.

[0015] Furthermore, the step of using the predicted wave information to calculate the motion response of the hull and obtain the theoretical motion response includes: using the predicted wave information to calculate the motion response of the hull through a rapid hull motion prediction method and obtain the theoretical motion response.

[0016] Furthermore, the step of issuing an early warning if the measured motion response is inconsistent with the theoretical motion response includes: if the measured motion response is inconsistent with the theoretical motion response, the theoretical motion response is mainly pitch roll with a small roll angle, and the measured motion response shows a large roll, and the roll difference between the measured motion response and the theoretical motion response becomes increasingly larger, then the ship is in the initial stage of parametric roll, and a preliminary early warning is issued.

[0017] Furthermore, the ship parameter rolling online warning method also includes: after giving a preliminary warning, an emergency plan is given in combination with the current loading, speed, route, and wave field information, and the ship operator takes alert measures.

[0018] Furthermore, the step of issuing an early warning if the measured motion response does not match the theoretical motion response includes: issuing a serious early warning if the measured motion response does not match the theoretical motion response, the roll angle in the measured motion response reaches a set angle, and the roll angle in the theoretical motion response is still a small angle.

[0019] Furthermore, the ship parameter roll online warning method also includes: after issuing a serious warning, executing an emergency plan to avoid the occurrence of parameter roll by changing the navigation state; the navigation state includes heading, acceleration, and deceleration.

[0020] Furthermore, the ship parameter roll online warning method also includes: if the measured motion response is consistent with the theoretical motion response, the measured motion response and the theoretical motion response are both mainly roll, or both are mainly pitch, indicating that the ship is currently in a safe state, and no warning is issued.

[0021] An online early warning device for ship parameter rolling, comprising:

[0022] The wave field information acquisition module is used to scan the waves in the sea area around the ship through radar to obtain wave field information;

[0023] The wave information forecast module is used to forecast the wave information reaching the hull based on the radar scanning results;

[0024] The motion response determination module is used to calculate the motion response of the hull using the predicted wave information to obtain the theoretical motion response; the motion of the hull is measured by the motion sensor installed on the hull to obtain the measured motion response;

[0025] Motion response comparison module, used to compare the measured motion response with the theoretical motion response;

[0026] The early warning module is used to issue an early warning if the measured motion response does not match the theoretical motion response.

[0027] The beneficial effects of the present invention are as follows: the present invention has distinct instantaneous characteristics for parameter roll, can accurately predict the occurrence of ship parameter roll, has the advantages of accuracy and timeliness, and realizes online early warning of ship parameter roll phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Flowchart of the on-line early warning method for ship parameter rolling according to a preferred embodiment of the present invention.

[0029] Figure 2 Schematic diagram of a ship floating in seawater according to a preferred embodiment of the present invention.

[0030] Figure 3 Schematic diagram of the structure of an online early warning device for ship parameter rolling according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0031] A preferred embodiment is given below and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0032] An embodiment of the present invention provides an online early warning method for ship parameter rolling.

[0033] like Figure 1 As shown, a ship parameter rolling online early warning method includes:

[0034] Step S1: Scan the waves in the sea area around the ship through radar to obtain wave field information.

[0035] Step S2: forecast the wave information reaching the hull based on the radar scanning result.

[0036] Step S3, using the predicted wave information, calculate the motion response of the hull to obtain a theoretical motion response; and measure the hull motion by a motion sensor installed on the hull to obtain a measured motion response.

[0037] Step S4: comparing the measured motion response with the theoretical motion response.

[0038] Step S5: If the measured motion response does not match the theoretical motion response, an early warning is issued.

[0039] like Figure 2 As shown, a radar 21 and a motion sensor 22 are provided on the ship, the ship floats in the sea water, and there are waves 23 around the hull 24 .

[0040] In step S1, the radar is an X-band radar, that is, the waves in the sea area around the ship are scanned by the X-band radar to obtain wave field information.

[0041] Step S2 includes: constructing a wave field mathematical model based on the radar scanning results, applying a wave propagation model, and predicting the wave information reaching the hull.

[0042] Among them, the wave field mathematical model and the wave propagation model are calculation methods recorded in textbooks in the field of ship technology and existing technologies, and will not be described in detail here.

[0043] In step S3, the step of using the predicted wave information to calculate the motion response of the hull and obtain the theoretical motion response includes: using the predicted wave information, through a rapid hull motion prediction method, calculating the motion response of the hull and obtaining the theoretical motion response.

[0044] Rapid ship motion prediction methods are based on calculation methods documented in ship technology textbooks and existing technologies. Frequency-domain, time-domain, or other ship motion calculation methods can be used. These methods calculate the ship's pitch and roll motion responses based on wave information at the hull. Because these motion responses are calculated, they are referred to as theoretical motion responses. The measured motion responses are those measured in real time.

[0045] Step S5: If the measured motion response does not match the theoretical motion response, an early warning is issued; wherein, if the measured motion response does not match the theoretical motion response, processing is performed according to the situation.

[0046] The first case: If the measured motion response is inconsistent with the theoretical motion response, the theoretical motion response is mainly pitch roll with a small roll angle, while the measured motion response shows a large roll, and the roll difference between the measured motion response and the theoretical motion response becomes larger and larger, then the ship is in the initial stage of parametric roll and a preliminary warning is given.

[0047] For the first situation, after giving a preliminary warning, an emergency plan is given based on the current loading, speed, route, and wave field information, and the ship operators take precautionary measures.

[0048] The second case: If the measured motion response does not match the theoretical motion response, the roll angle in the measured motion response reaches the set angle, and the roll angle in the theoretical motion response is still a small angle, a serious warning will be issued.

[0049] For the second situation, after issuing a serious warning, the emergency plan is implemented to avoid the occurrence of parameter roll by changing the navigation status; the navigation status includes heading, acceleration, and deceleration.

[0050] The ship parameter rolling online early warning method also includes:

[0051] If the measured motion response is consistent with the theoretical motion response, and both the measured motion response and the theoretical motion response are mainly rolling, or both are mainly pitching, it means that the ship is currently in a safe state and no warning is issued.

[0052] The method of the present invention has a distinct instantaneous characteristic for parametric rolling, can accurately predict the occurrence of ship parametric rolling, has the advantages of accuracy and timeliness, and realizes online early warning of ship parametric rolling phenomena.

[0053] An embodiment of the present invention also provides an online early warning device for ship parameter rolling.

[0054] like Figure 3 As shown, an online early warning device for ship parameter rolling includes: a wave field information acquisition module 11, a wave information forecasting module 12, a motion response determination module 13, a motion response comparison module 14, and an early warning module 15.

[0055] The wave field information acquisition module 11 is used to scan the waves in the sea area around the ship through radar to obtain wave field information. The radar is an X-band radar.

[0056] The wave information forecasting module 12 is used to forecast the wave information reaching the hull according to the radar scanning results.

[0057] The motion response determination module 13 is used to calculate the motion response of the hull using the predicted wave information to obtain a theoretical motion response; and to measure the hull motion using a motion sensor installed on the hull to obtain a measured motion response.

[0058] The motion response comparison module 14 is used to compare the measured motion response with the theoretical motion response.

[0059] The early warning module 15 is used to issue an early warning if the measured motion response does not match the theoretical motion response.

[0060] In one embodiment, the wave information forecasting module 12 is further configured to construct a wave field mathematical model based on the radar scanning results, apply a wave propagation model, and forecast the wave information reaching the hull.

[0061] In one embodiment, the motion response determination module 13 is further configured to use the predicted wave information to calculate the motion response of the hull through a rapid hull motion prediction method to obtain a theoretical motion response.

[0062] In one embodiment, the early warning module 15 is further configured to issue a preliminary early warning when the measured motion response differs from the theoretical motion response. For example, if the theoretical motion response is primarily pitch with a small roll angle, while the measured motion response exhibits a large roll, and the roll difference between the measured and theoretical motion responses becomes increasingly larger, the ship is in the initial stages of parametric roll. After issuing the preliminary early warning, an emergency plan is developed based on current load, speed, route, and wave field information, and the ship operator takes precautionary measures.

[0063] In one embodiment, the warning module 15 is further configured to issue a critical warning when the measured motion response differs from the theoretical motion response, and when the roll angle in the measured motion response reaches a set angle while the roll angle in the theoretical motion response is still at a small angle. After issuing the critical warning, the emergency plan is executed to avoid the occurrence of parametric roll by changing the navigation state; the navigation state includes heading, acceleration, and deceleration.

[0064] The ship parameter roll online warning device also includes a no-warning judgment module. The no-warning judgment module is used to ensure that the measured motion response is consistent with the theoretical motion response. When the measured motion response and the theoretical motion response are both mainly roll or mainly pitch, it means that the ship is currently in a safe state and no warning is issued.

[0065] The device of the present invention has a distinct instantaneous characteristic for parametric rolling, can accurately predict the occurrence of ship parametric rolling, has the advantages of accuracy and timeliness, and realizes online early warning of ship parametric rolling phenomena.

[0066] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A ship parameter rolling online early warning method, characterized in that: It includes: Scan the waves in the sea area around the ship through radar to obtain wave field information; According to the radar scanning results, the wave information reaching the hull is predicted; The predicted wave information is used to calculate the motion response of the hull and obtain the theoretical motion response; the motion of the hull is measured by the motion sensor installed on the hull to obtain the measured motion response; Compare the measured motion response with the theoretical motion response; If the measured motion response does not match the theoretical motion response, an early warning is issued; The step of issuing an early warning if the measured motion response does not match the theoretical motion response includes: If the measured motion response is inconsistent with the theoretical motion response, and the theoretical motion response is mainly pitching with a small roll angle, while the measured motion response shows a large roll, and the roll difference between the measured motion response and the theoretical motion response becomes larger and larger, then the ship is in the initial stage of parametric roll and a preliminary warning is issued; The step of issuing an early warning if the measured motion response does not match the theoretical motion response includes: If the measured motion response does not match the theoretical motion response, the roll angle in the measured motion response reaches the set angle, and the roll angle in the theoretical motion response is still a small angle, a serious warning will be issued.

2. The ship parameter rolling online early warning method according to claim 1, characterized in that: The radar is an X-band radar.

3. The ship parameter rolling online early warning method according to claim 1, characterized in that: The step of forecasting wave information reaching the hull based on the radar scanning result comprises: Based on the radar scanning results, a mathematical model of the wave field is constructed, and the wave propagation model is applied to predict the wave information reaching the hull.

4. The ship parameter rolling online early warning method according to claim 1, characterized in that: The step of calculating the motion response of the hull using the predicted wave information to obtain the theoretical motion response includes: The predicted wave information is used to calculate the motion response of the hull through the rapid prediction method of hull motion, and the theoretical motion response is obtained.

5. The ship parameter rolling online early warning method according to claim 1, characterized in that: The ship parameter rolling online early warning method further includes: After issuing a preliminary warning, an emergency plan is given based on the current loading, speed, route, and wave field information, and the ship operators take precautionary measures.

6. The ship parameter rolling online early warning method according to claim 1, characterized in that: The ship parameter rolling online early warning method further includes: After a serious warning is issued, the emergency plan is executed to avoid the occurrence of parameter roll by changing the navigation status; the navigation status includes heading, acceleration, and deceleration.

7. The ship parameter rolling online early warning method according to claim 1, characterized in that: The ship parameter rolling online early warning method further includes: If the measured motion response is consistent with the theoretical motion response, and both the measured motion response and the theoretical motion response are mainly rolling, or both are mainly pitching, it means that the ship is currently in a safe state and no warning is issued.

8. An online early warning device for ship parameter rolling, characterized in that: It includes: The wave field information acquisition module is used to scan the waves in the sea area around the ship through radar to obtain wave field information; The wave information forecast module is used to forecast the wave information reaching the hull based on the radar scanning results; The motion response determination module is used to calculate the motion response of the hull using the predicted wave information to obtain the theoretical motion response; The motion of the hull is measured by a motion sensor installed on the hull to obtain a measured motion response; Motion response comparison module, used to compare the measured motion response with the theoretical motion response; The early warning module is used to issue an early warning if the measured motion response is inconsistent with the theoretical motion response; it is also used to issue a preliminary early warning when the measured motion response is inconsistent with the theoretical motion response, the theoretical motion response is mainly pitch roll with a small roll angle, and the measured motion response shows a large roll, and the roll difference between the measured motion response and the theoretical motion response is getting bigger and bigger, and the ship is in the initial stage of parametric roll; it is also used to issue a serious early warning when the measured motion response is inconsistent with the theoretical motion response, the roll angle in the measured motion response reaches a set angle, and the roll angle of the theoretical motion response is still a small angle.

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