Ship safety state monitoring system and method using rolling motion data

Abstract

The present invention relates to a system and a method for monitoring a safe state of a ship using roll motion data, which receive roll cycle data, average lateral tilt angle data, and significant roll angle data from a roll cycle calculation unit, an average lateral tilt angle calculation unit, and a significant roll angle calculation unit. And a control unit that determines whether the roll cycle data is equal to or less than the maximum inherent roll cycle, and, when the roll cycle data is equal to or less than the maximum inherent roll cycle, determines that the roll cycle is in a normal state and displays the roll cycle normal state by the display unit. When the roll cycle data is greater than the maximum inherent roll cycle and is 40% or less of the maximum inherent roll cycle + the maximum inherent roll cycle, the control unit determines that the roll cycle is in an attention state and the display unit displays the roll cycle attention state, and when the roll cycle data is greater than 40% of the maximum inherent roll cycle + the maximum inherent roll cycle, the display unit displays the roll cycle attention state. And determining that the rolling period is in a dangerous state and displaying the dangerous state of the rolling period through a display part.

Description

Technical Field

[0001] The present invention relates to a ship safety status monitoring system and method using roll motion data, and more particularly, to a ship safety status monitoring system and method using roll motion data that determine and display the normal, caution, and dangerous states of each item of the roll period, average lateral tilt angle, and significant roll angle of a ship based on the roll period, average lateral tilt angle, and significant roll angle obtained by performing a fast Fourier transform (FFT) analysis on data obtained using an electronic inclinometer. Background Art

[0002] Currently, like other types of transportation means, ships are being deeply intelligentized. In particular, compared with other transportation means, life on ships is an area where the time required for manned operation is relatively long and the requirement for professionalism is relatively high. Therefore, it is rapidly developing towards intelligent ships such as autonomous navigation ships and unmanned ships that require relatively less manpower.

[0003] In Korean Registered Patent Publication No. 10-1880815 (hereinafter referred to as the prior art), there is disclosed a ship safety navigation monitoring and automatic risk avoidance service providing system that calculates the average value of sensed values by mounting various sensors including a ship slope detection sensor and a distance detection sensor, thereby preventing false operation of an alarm caused by malfunction of the device, and quickly automatically responding in an emergency situation where a mariner cannot respond in time.

[0004] However, in the prior art, a method is adopted in which the slope average value is compared with a preset standard value to analyze the degree of tilt, and when the result of the comparison analysis exceeds a preset critical value, a notification signal is generated in an alarm notification unit mounted on the ship. No specific criteria for generating the notification signal and the specific configuration related to the notification signal are proposed.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] (Patent Document 1) Korean Registered Patent Publication No. 10-1880815 (Title of the Invention: Ship Safety Navigation Monitoring and Automatic Risk Avoidance Service Providing System) Summary of the Invention

[0008] The present invention aims to solve the above-mentioned problems, and the object of the present invention is to provide a standard and a ship safety status monitoring system and method using roll motion data that can specifically propose an alarm signal representing the ship's safety status based on the roll motion data obtained from an electronic inclinometer and its composition.

[0009] To achieve the above object, a ship safety status monitoring system using roll motion data according to an embodiment of the present invention is characterized by including: a roll period calculation unit that calculates roll period data by performing fast Fourier transform (FFT) analysis on time-based roll angle data displayed in an electronic inclinometer; an average lateral tilt angle calculation unit that calculates average lateral tilt angle data by performing fast Fourier transform (FFT) analysis on the roll angle data; a significant roll angle calculation unit that calculates significant roll angle data by performing fast Fourier transform (FFT) analysis on the roll angle data; a control unit that receives the calculated roll period data, average lateral tilt angle data, and significant roll angle data, and determines the normal, attention, or dangerous state of the roll period by comparing and analyzing the roll period data with the maximum natural roll period and the maximum natural roll period + 40% of the maximum natural roll period, determines the normal, attention, or dangerous state of the average lateral tilt angle by comparing and analyzing the average lateral tilt angle data with 50% of the grade standard and the grade standard, and determines the normal, attention, and dangerous states of the average significant roll angle by comparing and analyzing the significant roll angle data with 50% of the grade standard and the grade standard; and a display unit that receives a display control signal from the control unit and performs display.

[0010] In the ship safety status monitoring system using roll motion data according to the above embodiment, the grade standard selects the smaller one of the ship's limit tilt angle and 10 [degrees].

[0011] In order to achieve the above-described object, a method for monitoring the safety state of a ship using roll motion data according to another embodiment of the present invention is characterized by including: a step of receiving roll period data, average lateral tilt angle data, and significant roll angle data by a control unit from a roll period calculation unit, an average lateral tilt angle calculation unit, and a significant roll angle calculation unit; a step of determining by the control unit whether the roll period data is below the maximum natural roll period; a step of determining by the control unit that the roll period is in a normal state and displaying the normal state of the roll period through a display unit when the roll period data is below the maximum natural roll period; a step of determining by the control unit that the roll period is in a caution state and displaying the caution state of the roll period through the display unit when the roll period data is greater than the maximum natural roll period and is below the maximum natural roll period + 40% of the maximum natural roll period; and a step of determining by the control unit that the roll period is in a dangerous state and displaying the dangerous state of the roll period through the display unit when the roll period data is greater than the maximum natural roll period + 40% of the maximum natural roll period.

[0012] According to the method for monitoring the safety state of a ship using roll motion data according to the another embodiment, after the receiving step, it may further include: a step of determining by the control unit whether the average lateral tilt angle data is below 50% of the grade standard; a step of determining by the control unit that the average lateral tilt angle is in a normal state and displaying the normal state of the lateral tilt angle through a display unit when the average lateral tilt angle data is below 50% of the grade standard; a step of determining by the control unit that the average lateral tilt angle is in a caution state and displaying the caution state of the average lateral tilt angle through the display unit when the average lateral tilt angle data is greater than 50% of the grade standard and is below the grade standard; and a step of determining by the control unit that the average lateral tilt angle is in a dangerous state and displaying the dangerous state of the average lateral tilt angle through the display unit when the average lateral tilt angle data is greater than the grade standard.

[0013] In the method for monitoring the ship safety state using roll motion data according to the another embodiment, after the receiving step, the method may further include: a step of determining, by the control unit, whether the significant roll angle data is 50% or less of the grade standard; a step of determining, by the control unit, that the significant roll angle is in a normal state and displaying the normal state of the significant roll angle through a display unit when the significant roll angle data is 50% or less of the grade standard; a step of determining, by the control unit, that the significant roll angle is in a caution state and displaying the caution state of the significant roll angle through the display unit when the significant roll angle data is greater than 50% and less than or equal to the grade standard; and a step of determining, by the control unit, that the significant roll angle is in a dangerous state and displaying the dangerous state of the significant roll angle through the display unit when the significant roll angle data is greater than the grade standard.

[0014] In the ship safety state monitoring system and method using roll motion data according to an embodiment of the present invention, roll period data, average lateral tilt angle data, and significant roll angle data are received from a roll period calculation unit, an average lateral tilt angle calculation unit, and a significant roll angle calculation unit, and it is determined whether the roll period data is less than or equal to the maximum natural roll period. When the roll period data is less than or equal to the maximum natural roll period, it is determined that the roll period is in a normal state and the normal state of the roll period is displayed through a display unit. When the roll period data is greater than the maximum natural roll period and less than or equal to the maximum natural roll period + 40% of the maximum natural roll period, the control unit determines that the roll period is in a caution state and the caution state of the roll period is displayed through the display unit. When the roll period data is greater than the maximum natural roll period + 40% of the maximum natural roll period, it is determined that the roll period is in a dangerous state and the dangerous state of the roll period is displayed through the display unit. In this way, a standard and a configuration for generating an alarm signal indicating the ship safety state based on the roll motion data of the ship obtained from an electronic inclinometer can be specifically proposed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a block diagram of a ship safety state monitoring system using roll motion data according to an embodiment of the present invention.

[0016] Figure 2 is a flowchart for explaining a method for monitoring the ship safety state using roll motion data according to an embodiment of the present invention.

[0017] REFERENCE NUMERAL DESCRIPTION

[0018] 100: Electronic inclinometer

[0019] 200: Roll period calculation unit

[0020] 210: Average Lateral Tilt Angle Calculation Unit

[0021] 220: Significant Rolling Angle Calculation Unit

[0022] 300: Control Unit

[0023] 400: Display Unit Detailed Implementation Manner

[0024] In the process of describing the embodiments of the present invention, when it is determined that a detailed description of the known technology related to the present invention may make the gist of the present invention unclear, the detailed description related thereto will be omitted. In addition, the terms used hereinafter are terms defined in consideration of their functions in the present invention, and may change according to the intentions or conventions of users and applicators, etc. Therefore, definitions should be made based on the overall content of this specification. The terms used in the detailed description are only used to describe the embodiments of the present invention and are not intended to be limiting. Unless otherwise clearly stated to the contrary, a singular statement also includes a plural meaning. In this specification, terms such as "including" or "equipped with" are only used to indicate the existence of certain characteristics, numbers, steps, actions, elements, and one part or combination thereof, and should not be construed as precluding the possibility of the existence of one or more other characteristics, numbers, steps, actions, elements, and one part or combination thereof.

[0025] In each of the systems illustrated in the drawings, in some cases, elements may be represented by the same reference numerals or different reference numerals, indicating that the elements represented may be different or similar. However, the elements may have different implementations and work together with a part or all of the systems shown or described in this specification. The elements illustrated in the drawings may be the same or different. Any one of them may be arbitrarily called the first element and the other may be called the second element.

[0026] In this specification, when it is described that a certain component "transmits", "passes", or "provides" data or signals to another component, it includes not only the case where a certain component directly transmits data or signals to another component, but also the case where data or signals are transmitted to another component via at least one other component.

[0027] Next, embodiments of the present invention will be described in detail with reference to the drawings.

[0028] Figure 1 is a block diagram of a ship safety status monitoring system using roll motion data according to an embodiment of the present invention.

[0029] A ship safety status monitoring system using roll motion data according to an embodiment of the present invention is installed on a ship and operates by receiving data measured by an electronic inclinometer 100, and includes an on-board roll period calculation unit 200, an average lateral tilt angle calculation unit 210, a significant roll angle calculation unit 220, a control unit 300, and a display unit 400.

[0030] The roll period calculation unit 200 can calculate roll period data by performing a fast Fourier transform (FFT) analysis on the time-based roll angle data displayed in the electronic inclinometer 100. The roll period is the time it takes for the ship to tilt from the state of maximum tilt to one side of the ship's hull to the other side and then return to the original position. That is, it is the time from the roll angle on the starboard side, through the roll angle on the port side, and then back to the roll angle on the starboard side, with the unit being [degree].

[0031] The average lateral tilt angle calculation unit 210 can calculate average lateral tilt angle data by performing a fast Fourier transform (FFT) analysis on the time-based roll angle data displayed in the electronic inclinometer 100. The lateral tilt angle is the angle when the ship is laterally tilted and remains parallel in still water. This is an indicator used to show the possibility that the ship may tilt to one side of the ship's hull when damaged or taking in water. Due to the phenomenon that the load is biased to one side during the process of loading fishing gear onto small fishing boats and the like, it may be found that the ship cannot stand upright but is parked or sailing in a tilted state during berthing or sailing, and the lateral tilt angle can represent its non-upright state. In particular, since it is difficult to visually calculate the lateral tilt angle of the ship at sea, the average lateral tilt angle is an important safety factor that can be used in the process of confirming whether the ship is upright by using the electronic inclinometer 100 to calculate the average of the roll angles on the port and starboard sides when quantitatively observing the upright state of the ship to ensure ship safety. The average lateral tilt angle is the result of calculating the average of the roll angles on the port and starboard sides each time a fast Fourier transform (FFT) analysis is performed and averaging over the total number of times (n).

[0032] The significant roll angle calculation unit 220 can calculate significant roll angle data by performing fast Fourier transform (FFT) analysis on the time-based roll angle data displayed in the electronic inclinometer 100. The roll angle refers to the maximum angle of the ship's inclination caused by the ship's roll. The lateral inclination angle is a static angle, while the roll angle is a dynamic angle caused by the ship's roll and is an element that can be independently generated according to the ocean and navigation conditions regardless of the ship's damage and water ingress. In the electronic inclinometer 100, the roll angle on the port side is displayed as a negative number (-), and the roll angle on the starboard side is displayed as a positive number (+). The average value of the upper 1 / 3 of the ship's roll angles (for the port and starboard sides respectively) is defined as the significant roll angle. Therefore, it can be used as a main indicator to grasp the significant value of the inclination angle caused by the roll. To calculate the significant roll value, during the process of calculating the natural roll period, the maximum roll angles of the port and starboard sides can be derived respectively each time the fast Fourier transform (FFT) analysis is performed, and the significant value can be calculated thereby. Since it is a significant value, the average value of 1 / 3 of the data is calculated, and the calculated significant roll value is averaged over the total number of times (n).

[0033] The control unit 300 is a microcomputer for controlling the overall components, and can receive the roll period data, average lateral inclination angle data, and significant roll angle data calculated in the roll period calculation unit 200, average lateral inclination angle calculation unit 210, and significant roll angle calculation unit 220, perform comparative analysis, thereby confirming the normal, attention, or dangerous states of the roll period, average lateral inclination angle, and significant roll angle, and output a display control signal corresponding to each determined state to the display unit 400 for display. The control unit 300 can compare and analyze the input roll period data with the maximum natural roll period and the maximum natural roll period + 40% of the maximum natural roll period, thereby determining the normal, attention, or dangerous state of the roll period. The control unit 300 can compare and analyze the average lateral inclination angle data with 50% of the grade standard and the grade standard, thereby determining the normal, attention, or dangerous state of the average lateral inclination angle. The control unit 300 can compare and analyze the significant roll angle data with 50% of the grade standard and the grade standard, thereby determining the normal, attention, or dangerous state of the average significant roll angle. The grade standard can be selected as the smaller one between the ship's limit inclination angle and 10 [degrees].

[0034] The same grade standard is applied to the average lateral inclination angle and the significant roll angle for grading. In addition, in the attention grade, in addition to applying 50% of the grade standard, experienced crew members can manually input experience values and apply them.

[0035] Next, the characteristics of each element will be described based on [Table 1] and [Table 2] below.

[0036] Regarding the roll period, it can be confirmed that "Attention" and "Danger" are clearly distinguished based on 40% of the upper limit value of the natural roll period range of each ship. In particular, Ships H and I are ferry boats. Considering that due to the flat surface of the ships, they are more sensitive to changes in the marine environment compared to training ships or passenger ships. When the roll period of the ship exceeds 7 seconds, it clearly indicates that the marine environment is very unstable. From the same perspective, regarding the average lateral inclination angle and the significant roll angle, it can be confirmed that for ferry boats, as long as the change in the inclination angle is slightly larger compared to other ships, it is also a very dangerous state for the ship. That is, it can be confirmed that even if a tilt angle of about 5 degrees occurs on Ship G, it is within the normal range, but when a tilt angle of 5 degrees occurs on Ship I, the corresponding ship is also in a very dangerous situation. Regarding the limit tilt angle range of training ships and passenger ships, their safety can be ensured even when it exceeds 10 degrees. Therefore, it can be confirmed that even if a standard of 10 degrees is applied, their danger can be fully avoided.

[0037]

Table 1

[0038]

[0039] 【Table 2

[0040]

[0041] The display unit 400 can function to receive a display control signal from the control unit 300 and display the normal, attention, or danger state of the ship's roll period, average lateral inclination angle, and significant roll angle. The display unit 400 can use output devices such as a plasma display panel (PDP), a liquid crystal display (LCD), a light-emitting diode (LED), and an organic light-emitting diode (OLED).

[0042] Next, a ship safety state monitoring method of a ship safety state monitoring system using roll motion data according to an embodiment of the present invention configured as described above will be described.

[0043] Figure 2 It is a flowchart for explaining a ship safety state monitoring method using roll motion data according to an embodiment of the present invention, where S represents a step.

[0044] First, in step S100, the control unit 300 receives roll period data, average lateral inclination angle data, and significant roll angle data from the roll period calculation unit 200, the average lateral inclination angle calculation unit 210, and the significant roll angle calculation unit 220.

[0045] Next, in step S200, the control unit 300 determines whether the roll period data is equal to or less than the maximum natural roll period.

[0046] When it is determined in step S200 that the roll period data is equal to or less than the maximum natural roll period (Y), in step S230, the control unit 300 determines that the roll period is in a normal state and displays the normal state of the roll period through the display unit 400.

[0047] When it is determined in step S200 that the roll period data is greater than the maximum natural roll period (N), in step S210, the control unit 300 determines whether the roll period data is equal to or less than the maximum natural roll period + 40% of the maximum natural roll period.

[0048] When it is determined in step S210 that the roll period data is equal to or less than the maximum natural roll period + 40% of the maximum natural roll period (Y), in step S240, the control unit 300 determines that the roll period is in a caution state and displays the caution state of the roll period through the display unit 400.

[0049] When it is determined in step S210 that the roll period data is greater than the maximum natural roll period + 40% of the maximum natural roll period, in step S220, the control unit 300 determines that the roll period is in a dangerous state and displays the dangerous state of the roll period through the display unit 400.

[0050] In addition, after step S100, in step S300, the control unit 300 determines whether the average lateral tilt angle data is equal to or less than 50% of the grade standard.

[0051] When it is determined in step S300 that the average lateral tilt angle data is equal to or less than 50% of the grade standard, in step S330, the control unit 300 determines that the average lateral tilt angle is in a normal state and displays the normal state of the lateral tilt angle through the display unit 400.

[0052] When it is determined in step S300 that the average lateral tilt angle data is greater than 50% of the grade standard (N), in step S310, the control unit 300 determines whether the average lateral tilt angle data is equal to or less than the grade standard.

[0053] When it is determined in step S310 that the average lateral tilt angle data is equal to or less than the grade standard (Y), in step S340, the control unit 300 determines that the average lateral tilt angle is in a caution state and displays the caution state of the average lateral tilt angle through the display unit 400.

[0054] In addition, when it is determined in the step S310 that the average lateral tilt angle data is greater than the grade standard (N), in the step S320, the control unit 300 determines that the average lateral tilt angle is in a dangerous state and displays the dangerous state of the average lateral tilt angle through the display unit 400.

[0055] In addition, after the step S100, in the step S400, the control unit 300 determines whether the significant roll angle data is 50% or less of the grade standard.

[0056] When it is determined in the step S400 that the significant roll angle data is 50% or less of the grade standard (Y), in the step S430, the control unit 300 determines that the significant roll angle is in a normal state and displays the normal state of the significant roll angle through the display unit 400.

[0057] When it is determined in the step S400 that the significant roll angle data is greater than 50% of the grade standard (N), in the step S410, the control unit 300 determines whether the significant roll angle data is below the grade standard.

[0058] When it is determined in the step S410 that the significant roll angle data is below the grade standard (Y), in the step S440, the control unit 300 determines that the significant roll angle is in a caution state and displays the caution state of the significant roll angle through the display unit 400.

[0059] When it is determined in the step S410 that the significant roll angle data is greater than the grade standard (Y), in the step S420, the control unit 300 determines that the significant roll angle is in a dangerous state and displays the dangerous state of the significant roll angle through the display unit 400.

[0060] In the ship safety status monitoring system and method using roll motion data according to an embodiment of the present invention, roll period data, average lateral tilt angle data, and significant roll angle data are received from a roll period calculation unit, an average lateral tilt angle calculation unit, and a significant roll angle calculation unit, and it is determined whether the roll period data is below the maximum natural roll period. When the roll period data is below the maximum natural roll period, it is determined that the roll period is in a normal state and the normal state of the roll period is displayed through a display unit. When the roll period data is greater than the maximum natural roll period and is below the maximum natural roll period + 40% of the maximum natural roll period, the control unit determines that the roll period is in a caution state and the caution state of the roll period is displayed through the display unit. When the roll period data is greater than the maximum natural roll period + 40% of the maximum natural roll period, it is determined that the roll period is in a dangerous state and the dangerous state of the roll period is displayed through the display unit. In this way, it is possible to specifically propose a standard and composition for generating an alarm signal indicating the ship safety status based on the roll motion data of the ship obtained from an electronic inclinometer.

[0061] The best embodiments are disclosed in the drawings and the specification and specific terms are used, but this is only for explaining the implementation forms of the present invention and not for limiting its meaning or the scope of the present invention described in the claims. Therefore, those with general knowledge in the technical field should understand that the present invention can be implemented through various deformations or equivalent other embodiments. Therefore, the true technical protection scope of the present invention should be defined according to the technical idea of the appended claims.

Claims

1. A ship safety status monitoring system using rolling motion data, characterized in that: The ship safety status monitoring system using rolling motion data includes: A roll period calculation unit (200) calculates roll period data by performing a fast Fourier transform (FFT) analysis on the time-based roll angle data displayed in the electronic inclinometer (100); an average lateral tilt angle calculation unit (210) for calculating average lateral tilt angle data by performing a fast Fourier transform (FFT) analysis on the roll angle data; A significant roll angle calculation unit (220) calculates significant roll angle data by performing a fast Fourier transform (FFT) analysis on the roll angle data; A control unit (300) receives the calculated roll cycle data, average lateral tilt angle data and significant roll angle data, determines the normal, caution or dangerous state of the roll cycle by comparing and analyzing the roll cycle data with the maximum natural roll cycle and the maximum natural roll cycle + 40% of the maximum natural roll cycle, determines the normal, caution or dangerous state of the average lateral tilt angle by comparing and analyzing the average lateral tilt angle data with 50% of the grade standard and the grade standard, and determines the normal, caution and dangerous state of the average significant roll angle by comparing and analyzing the significant roll angle data with 50% of the grade standard and the grade standard; and The display unit (400) receives a display control signal from the control unit (300) and performs display.

2. The ship safety status monitoring system using rolling motion data according to claim 1 is characterized in that: The rating standard selects the smaller of the vessel's extreme inclination angle and 10 [degrees].

3. A ship safety status monitoring method, which is a ship safety status monitoring method using a ship safety status monitoring system using rolling motion data, characterized in that: The ship safety status monitoring method comprises: A step of receiving, by a control unit (300), roll period data, average lateral tilt angle data and significant roll angle data from a roll period calculation unit (200), an average lateral tilt angle calculation unit (210) and a significant roll angle calculation unit (220); The control unit (300) determines whether the roll period data is less than the maximum natural roll period; When the roll cycle data is less than the maximum natural roll cycle, the control unit (300) determines that the roll cycle is in a normal state and displays the normal state of the roll cycle through the display unit (400); When the roll cycle data is greater than the maximum natural roll cycle and is less than the maximum natural roll cycle + 40% of the maximum natural roll cycle, the control unit (300) determines that the roll cycle is in a caution state and displays the roll cycle caution state through the display unit (400); and When the roll cycle data is greater than the maximum natural roll cycle + 40% of the maximum natural roll cycle, the control unit (300) determines that the roll cycle is in a dangerous state and displays the roll cycle dangerous state through the display unit (400).

4. The ship safety status monitoring method according to claim 3, characterized in that: After the receiving step, the method further includes: The control unit (300) determines whether the average lateral tilt angle data is less than 50% of the grade standard; When the average lateral tilt angle data is less than 50% of the grade standard, the control unit (300) determines that the average lateral tilt angle is in a normal state and displays the normal state of the lateral tilt angle through the display unit (400); When the average lateral tilt angle data is greater than 50% of the grade standard and is below the grade standard, the control unit (300) determines that the average lateral tilt angle is in a warning state and displays the average lateral tilt angle warning state through the display unit (400); and When the average lateral tilt angle data is greater than the grade standard, the control unit (300) determines that the average lateral tilt angle is in a dangerous state and displays the dangerous state of the average lateral tilt angle through the display unit (400).

5. The ship safety status monitoring method according to claim 3, characterized in that: After the receiving step, the method further includes: The control unit (300) determines whether the significant roll angle data is less than 50% of the grade standard; When the significant roll angle data is less than 50% of the grade standard, the control unit (300) determines that the significant roll angle is in a normal state and displays the normal state of the significant roll angle through the display unit (400); When the significant roll angle data is greater than 50% of the level standard and is below the level standard, the control unit (300) determines that the significant roll angle is in a caution state and displays the significant roll angle caution state through the display unit (400); and When the significant roll angle data is greater than the level standard, the control unit (300) determines that the significant roll angle is in a dangerous state and displays the significant roll angle dangerous state through the display unit (400).

Images