Ship parameter rolling on-line early warning method and device

Abstract

The invention discloses a ship parameter rolling on-line early warning method and device, and the method comprises the steps: carrying out the scanning of sea waves in a surrounding sea area of a ship through a radar, and obtaining the information of a sea wave field; forecasting information of waves arriving at the ship body according to a radar scanning result; calculating the motion response of the ship body by using the forecasted wave information to obtain a theoretical motion response; measuring the motion of the ship body by a motion sensor mounted on the ship body to obtain an actually measured motion response; comparing the actually measured motion response with the theoretical motion response; and if the actually measured motion response does not accord with the theoretical motion response, performing early warning. According to the method, the parameter rolling has distinct instantaneous characteristics, the occurrence of the ship parameter rolling can be accurately forecasted, the method has the advantages of being accurate and timely, and online early warning of the ship parameter rolling phenomenon is achieved.

Description

Technical Field

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

[0002] Ship parametric roll is a nonlinear mechanical phenomenon that occurs in container ships, car carriers, passenger ships and other ships with large external drift characteristics. It is characterized by obvious and large-scale roll motion when facing waves and following waves (usually facing waves and following waves will not cause large-scale roll motion, and large-scale roll motion mainly occurs in transverse waves). When parametric roll occurs, the roll angle can reach more than 20 degrees, which seriously affects the safety of ship operation and causes cargo loss, shipwreck, etc.

[0003] At present, the prediction system of ship parametric rolling is mainly based on route weather forecast, and whether parametric rolling occurs is judged according to the period and direction of the route waves. The prediction accuracy of such methods depends on the accuracy of weather forecast, and parametric rolling has a distinct instantaneous characteristic. It is difficult to judge the occurrence of an instantaneous phenomenon with a forecast of several hours.

[0004] The existing ship parameter roll prediction system cannot effectively solve the ship parameter roll prediction problem. 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 sensor installed on the hull measures the hull motion and obtains 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 according to the radar scanning results includes: constructing a wave field mathematical model according to 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, through a rapid prediction method of hull motion, to calculate the motion response of the hull 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 larger and 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 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 of 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 are both 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 the wave field information;

[0023] The wave information forecasting module is used to forecast the wave information reaching the hull according to 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] A motion response comparison module is 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 rolling, can accurately predict the occurrence of ship parameter rolling, has the advantages of accuracy and timeliness, and realizes online early warning of ship parameter rolling phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0030] Figure 3 The figure is a schematic structural diagram 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 comprises:

[0034] Step S1, scanning the waves in the sea area around the ship by radar to obtain wave field information.

[0035] Step S2: forecast the wave information reaching the hull according to 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 the wave field information.

[0041] Step S2 includes: constructing a wave field mathematical model according to the radar scanning result, 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 to obtain the theoretical motion response includes: using the predicted wave information, through a hull motion rapid prediction method, calculating the motion response of the hull to obtain the theoretical motion response.

[0044] The rapid prediction method of hull motion is a calculation method recorded in textbooks and prior art in the field of ship technology. It can adopt frequency domain, time domain ship motion calculation method or other ship motion calculation method. The rapid prediction method of hull motion can calculate the pitch and roll motion response of the ship based on the wave information at the hull. Since the motion response is calculated, the motion response is called the theoretical motion response. The measured motion response is the motion response measured in real time.

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

[0049] For the second situation, 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.

[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 parameter rolling, can accurately predict the occurrence of ship parameter rolling, has the advantages of accuracy and timeliness, and realizes online early warning of ship parameter rolling phenomenon.

[0053] The 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 the 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 result.

[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 used to construct a wave field mathematical model based on the radar scanning results, and apply a wave propagation model to forecast the wave information reaching the hull.

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

[0062] In one embodiment, the early warning module 15 is also used to give a preliminary early warning when the measured motion response is inconsistent with the theoretical motion response, the theoretical motion response is mainly pitching and the roll angle is a small angle, and the measured motion response has a large roll, and the roll difference between the measured motion response and the theoretical motion response is getting bigger and bigger, then the ship is in the initial stage of parameter roll. After the preliminary early warning is given, an emergency plan is given in combination with the current loading, speed, route, and wave field information, and the ship operator takes precautions.

[0063] In one embodiment, the early warning module 15 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. After the serious early warning is issued, the emergency plan is executed to avoid the occurrence of parameter 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, which 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 parameter rolling, can accurately predict the occurrence of ship parameter rolling, has the advantages of accuracy and timeliness, and realizes online early warning of ship parameter rolling phenomenon.

[0066] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection 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, but these changes and modifications all fall within the protection 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 sensor installed on the hull measures the hull motion and obtains 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.

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 predicting the wave information arriving at the hull according to the radar scanning result comprises: According to 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 by using the predicted wave information to obtain the theoretical motion response comprises: By using the predicted wave information and the rapid prediction method of hull motion, the motion response of the hull is calculated to obtain the theoretical motion response.

5. The ship parameter rolling online early warning method according to claim 1, characterized in that: The step of providing an early warning if the measured motion response does not match the theoretical motion response comprises: 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.

6. The ship parameter rolling online early warning method according to claim 5, characterized in that: The ship parameter rolling online early warning method also includes: 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.

7. The ship parameter rolling online early warning method according to claim 1, characterized in that: The step of providing an early warning if the measured motion response does not match the theoretical motion response comprises: 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 is issued.

8. The ship parameter rolling online early warning method according to claim 7, characterized in that: The ship parameter rolling online early warning method also 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.

9. The ship parameter rolling online early warning method according to claim 1, characterized in that: The ship parameter rolling online early warning method also 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.

10. 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 the wave field information; The wave information forecasting module is used to forecast the wave information reaching the hull according to 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; A motion response comparison module is 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 does not match the theoretical motion response.

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