A method and apparatus for recommending port entry and exit in tidal river sections based on ship fuel consumption.

Abstract

This invention provides a method and apparatus for recommending port entry and exit in tidal river sections based on ship fuel consumption. It only considers the impact of tidal currents on the actual speed of ships. Specifically, it quantitatively analyzes tidal currents through predicted tides and directly analyzes the actual speed of ships during navigation by combining the tides and the water flow speed they affect. It calculates and accumulates fuel consumption using existing and relatively accurate relationships between speed and fuel consumption to estimate the fuel consumption of the entire route. This allows for the recommendation of time windows for construction ships to enter and exit ports, selecting time windows with lower fuel consumption to optimize fuel consumption for construction ships in tidal river sections, thereby achieving the goals of energy conservation, emission reduction, and reduced navigation costs.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of ship fuel consumption optimization technology, and in particular to a method and apparatus for recommending entry and exit from ports in tidal river sections based on ship fuel consumption. Background Technology

[0002] At its 61st session in 2010, the International Maritime Organization (IMO) incorporated the Ship Energy Efficiency Management Plan (SEEMP) into the amendments to the 1973 International Convention for the Prevention of Pollution from Ships. This initiative sets forth systematic requirements for ship energy efficiency management and stipulates the emission reduction responsibilities of ships and fleets. The IMP aims to establish mandatory energy efficiency standards applicable to all operating vessels, gradually controlling and reducing total CO2 emissions at sea. SEEMP establishes an assessment mechanism for fleets and ships, introducing the Energy Efficiency Operational Index (EEOI) as an evaluation benchmark. The EEOI is obtained through the monitoring of ship operational data. Fleets and ships must use this monitoring data as a basis to improve ship energy efficiency through optimized navigation plans and enhanced equipment maintenance and upgrades.

[0003] Furthermore, the shipping industry is a high-investment, high-risk sector. In the current fiercely competitive global economy, shipping companies face a challenging competitive environment. Rising fuel prices, increased port fees, and higher maintenance costs have led to a significant increase in ship operating costs. Therefore, strengthening cost control has become crucial for shipping companies to adapt to market competition and gain a competitive advantage. Given a fixed revenue stream, shipping companies must strengthen cost control, reduce costs, and increase ship operating profits.

[0004] Existing technologies utilize big data to mine ship fuel consumption data and construct fuel consumption models for ship main engines under different operating conditions, thereby optimizing fuel consumption in various navigation environments. However, current methods of using energy efficiency big data for data mining and fuel consumption model building often suffer from insufficient or incomplete data, as well as inherent problems with the modeling methods themselves. This often results in models that cannot accurately predict fuel consumption, thus affecting the effectiveness of fuel consumption optimization. Furthermore, existing fuel consumption models are typically based on environmental factors such as wind, waves, and currents, as well as data on ship load weight and speed. These data often contain factors that do not have a clear impact on ship fuel consumption. In addition, some environmental factors are complex and variable, making quantitative analysis with simple data formats difficult. All of these factors contribute to problems in building fuel consumption prediction models, making it difficult to establish accurate models. When using the fuel consumption prediction model obtained from the above method to predict fuel consumption and recommend the time window for ships entering and leaving the port in tidal river sections, just like the input variables used in the model establishment, too many factors need to be considered. It is also easy for other factors and unforeseen circumstances to have an impact. Moreover, the model itself does not have a strong anti-interference ability, which brings certain difficulties and increases the workload to the time window recommendation work, and also affects its final effect. Summary of the Invention

[0005] In view of this, it is necessary to provide a method and device for recommending entry and exit from ports in tidal river sections based on ship fuel consumption, so as to solve the problems in the existing technology that the fuel consumption model cannot accurately predict fuel consumption due to the lack of data and incomplete data, and the weak anti-interference ability due to the same input variables used to establish the fuel consumption model.

[0006] To address the aforementioned technical problems, one aspect of this invention provides a method for recommending port entry and exit in tidal river sections based on ship fuel consumption, comprising:

[0007] Determine the voyage time period and route when the ship departs in different time windows; obtain tidal forecast data along the route within the voyage time period;

[0008] Based on the tidal forecast data and the set actual sailing speed during the voyage time period, the still water sailing speed at any point on the sailing route is calculated.

[0009] Based on the still water speed and the pre-established still water fuel consumption model, the instantaneous fuel consumption at any point on the navigation route is calculated, and the total fuel consumption of the navigation route is determined based on the instantaneous fuel consumption at any point; the time window with the minimum total fuel consumption is selected for recommendation.

[0010] Among some possible implementations, obtaining tidal forecast data along the navigation route during the voyage period includes:

[0011] The period and amplitude of each selected tidal constituent on the navigation route are obtained, and the superimposed amplitude of each tidal constituent at multiple points on the navigation route during the voyage time period is calculated to obtain the tidal current forecast data for the corresponding multiple points.

[0012] Based on the least squares fitting interpolation mathematical model, numerical interpolation is performed on the tidal current forecast data between any two adjacent points to obtain the tidal forecast data on the navigation route.

[0013] In some possible implementations, after obtaining the period and amplitude of each selected tidal constituent along the navigation route, the following are also included:

[0014] Tides with a period similarity greater than a preset similarity threshold are merged into a tidal group; the tidal group with the largest amplitude is determined, and the amplitudes of the remaining tidal groups are merged into the tidal group with the largest amplitude.

[0015] In some possible implementations, the superimposed amplitude of each tidal constituent at multiple points along the navigation route during the voyage period is calculated, specifically including:

[0016] Obtain the northward component of the residual current; and determine the superimposed northward component of all tidal components based on the tidal harmonic constant, the angular rate of the tidal components, the astronomical revision coefficient of the merged tidal components and the zero-time astronomical phase angle, and the dedicated lag angle of the northward component of the tidal current; determine the northward component of the tidal current based on the northward component of the residual current and the superimposed northward component of all tidal components.

[0017] Obtain the eastward component of the residual current; and determine the superimposed eastward component of all tidal constituents based on the tidal harmonic constant, the angular rate of the tidal constituents, the astronomical revision coefficient of the merged tidal constituents and the zero-time astronomical phase angle, and the dedicated lag angle of the eastward component of the tidal current; determine the eastward component of the tidal current based on the eastward component of the residual current and the superimposed eastward component of all tidal constituents.

[0018] In some possible implementations, the still-water speed at any point on the navigation route is calculated based on the tidal forecast data and the set actual navigation speed during the voyage period, specifically including:

[0019] The ocean current speed at any point on the navigation route at any time is determined based on the tidal forecast data.

[0020] The time when the ship reaches any point is determined based on the navigation route and the set actual navigation speed, and the corresponding ocean current speed is extracted; the still water navigation speed required to maintain the set actual navigation speed is determined based on the velocity vector superposition method.

[0021] In some possible implementations, the total fuel consumption of the navigation route is determined based on the instantaneous fuel consumption at any point, specifically including:

[0022] Based on the discretization multiplication method, the instantaneous fuel consumption at each point is multiplied by the sampling period to obtain the periodic fuel consumption within the corresponding sampling period. The total fuel consumption of the navigation route is obtained by summing all the periodic fuel consumptions.

[0023] Among the possible implementations are:

[0024] Based on the ship's displacement Δ and sailing speed v Linear parameters c 1. Speed ​​index parameter c 2. Discharge Index Parameter c 3. Construct a still water fuel consumption model r F :

[0025]

[0026] Taking the logarithm of both sides of the equation for the still water fuel consumption model, we get:

[0027]

[0028] Obtain the hourly fuel consumption, speed, and displacement records of the ship during its calm water navigation history; transform the calm water fuel consumption model into a linear correlation function of a multivariate function; solve the linear correlation function based on the least squares method and the recorded information to obtain the model parameters of the calm water fuel consumption model.

[0029] Secondly, embodiments of the present invention also provide a device for recommending port entry and exit in tidal river sections based on ship fuel consumption, comprising:

[0030] The tide forecast module is used to determine the voyage time period and navigation route when a ship departs at different time windows; and to acquire tide forecast data along the navigation route within the voyage time period.

[0031] The still water speed calculation module calculates the still water speed at any point on the navigation route based on the tidal forecast data and the set actual navigation speed within the voyage time period.

[0032] The fuel consumption recommendation module calculates the instantaneous fuel consumption at any point on the navigation route based on the still water speed and the pre-established still water fuel consumption model, determines the total fuel consumption of the navigation route based on the instantaneous fuel consumption at any point, and selects the time window with the minimum total fuel consumption for recommendation.

[0033] Thirdly, embodiments of the present invention provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps of the method for recommending entry and exit from tidal river sections based on ship fuel consumption as described in the first aspect of the present invention.

[0034] Fourthly, embodiments of the present invention provide a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method for recommending entry and exit from tidal river sections based on ship fuel consumption as described in the first aspect of the present invention.

[0035] The beneficial effects of the above embodiments are as follows: The method for recommending entry and exit from tidal river sections based on ship fuel consumption provided by the present invention only considers the impact of tidal current on the actual speed of ships. That is, it quantitatively analyzes the tidal current through the predicted tides, directly combines the tides and the water flow speed they affect to analyze the actual speed of ships during navigation, calculates and accumulates fuel consumption through the existing and relatively accurate relationship between speed and fuel consumption, and estimates the fuel consumption of the entire route to recommend the time windows for construction ships to enter and exit ports. From these, time windows with lower fuel consumption are selected to optimize the fuel consumption of construction ships in tidal river sections, thereby achieving the goals of energy conservation, emission reduction, and reduced navigation costs. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A schematic flowchart of an embodiment of the method for recommending entry and exit from ports in tidal river sections based on ship fuel consumption provided by the present invention;

[0038] Figure 2 This is a graph showing the change in a ship's speed in still water during a certain voyage.

[0039] Figure 3 A schematic diagram of an embodiment of the device for recommending port entry and exit in tidal river sections based on ship fuel consumption provided by the present invention;

[0040] Figure 4 This is a schematic diagram of an embodiment of the recommended equipment for entering and leaving ports in tidal river sections based on ship fuel consumption provided by the present invention. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor systems and / or microcontroller systems.

[0043] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0044] In existing technologies, when ship fuel consumption prediction models are used to predict fuel consumption and recommend time windows for ships entering and leaving ports in tidal river sections, the input variables used in model building need to consider too many factors. They are also prone to the influence of other factors and unforeseen circumstances. Furthermore, the models themselves do not have strong anti-interference capabilities. This brings certain difficulties and increases the workload to the time window recommendation work, and also affects its final results.

[0045] Therefore, this invention provides a method and apparatus for recommending port entry and exit in tidal river sections based on ship fuel consumption. Instead of relying on a fuel consumption prediction model, it directly analyzes the ship's speed during navigation by combining tides and their influence on water flow speed. By using existing and relatively accurate relationships between speed and fuel consumption, fuel consumption is calculated and accumulated to estimate the fuel consumption for the entire route. This allows for the recommendation of time windows for construction vessels to enter and exit ports, optimizing fuel consumption for construction vessels in tidal river sections, thereby achieving energy conservation, emission reduction, and cost reduction. Several embodiments will be described and explained below.

[0046] Figure 1 This is a schematic flowchart of an embodiment of the method for recommending entry and exit from ports in tidal river sections based on ship fuel consumption provided by the present invention. Figure 1 As shown, the recommended methods for entering and leaving ports in tidal river sections based on ship fuel consumption include:

[0047] Step S1: Determine the voyage time period and navigation route when the ship departs in different time windows; obtain tidal forecast data along the navigation route within the voyage time period;

[0048] Step S2: Calculate the still water speed at any point on the navigation route based on the tide forecast data and the set actual navigation speed during the voyage time period.

[0049] Step S3: Based on the still water speed and the pre-established still water fuel consumption model, calculate the instantaneous fuel consumption at any point on the navigation route, determine the total fuel consumption of the navigation route based on the instantaneous fuel consumption at any point, and select the time window with the minimum total fuel consumption for recommendation.

[0050] Understandably, in this embodiment, the actual sailing speed represents the ship's speed relative to the seabed after being affected by both wind and current, also known as the "land-to-water speed." The actual sailing speed is the vector sum of the water-to-water speed and the current speed. The still-water speed refers to the speed under windless and currentless conditions, i.e., the distance the ship travels in a straight line relative to the ground per unit time in still water. The water-to-water speed refers to the ship's speed relative to the water, which is independent of the current speed but related to the wind speed. Under still-water conditions with no wind or current, the still-water speed is equal to the water-to-water speed. Considering only the thrust of the current, the vector sum of the still-water speed and the current speed equals the actual sailing speed. Therefore, the actual sailing speed and the current speed can be vector-calculated to obtain the ship's still-water speed, and then the ship's fuel consumption can be calculated based on the still-water speed.

[0051] From a physics perspective, ships are primarily affected by thrust and drag during navigation. Thrust is mainly generated by the engine driving the propeller, and also includes thrust from water, wind, and current in the same direction. Drag includes resistance from water, wind, and current in the opposite direction. Therefore, in a ship fuel consumption model, influencing factors can be divided into two main aspects: the power conversion of the ship's propulsion system and the changes in thrust and drag caused by environmental factors during the ship's navigation. This invention mainly considers the influence of current, and the ship's speed in still water can be simply used as a factor affecting ship fuel consumption. Therefore, by analyzing the impact of tidal currents on the ship's actual speed, i.e., by quantitatively analyzing tidal currents using predicted tides; after obtaining the current speed and direction, combined with the set actual navigation speed for the entire voyage, the ship's still water navigation speed can be obtained. The fuel consumption required at this still water navigation speed is equivalent to the work done after overcoming resistance (i.e., offsetting the fuel consumption required against the current) or saving some energy due to the use of thrust (i.e., the speed with the current).

[0052] Based on the above embodiments, as a preferred implementation method, obtaining tidal forecast data along the navigation route during the voyage period specifically includes:

[0053] The period and amplitude of each selected tidal constituent on the navigation route are obtained, and the superimposed amplitude of each tidal constituent at multiple points on the navigation route during the voyage time period is calculated to obtain the tidal current forecast data for the corresponding multiple points.

[0054] Based on the least squares fitting interpolation mathematical model, numerical interpolation is performed on the tidal current forecast data between any two adjacent points to obtain the tidal forecast data on the navigation route.

[0055] Calculating the actual speed of a ship traveling in different sea states and along different routes is a crucial issue. In nearshore and offshore areas, such as the tidal river sections involved in this embodiment of the invention, the calculation of the actual speed of a ship involves multiple aspects, including ocean current calculations, ship stall calculations in wind and waves, and shallow water stall calculations. Therefore, it is necessary to analyze the main factors affecting speed calculation and provide a specific model applicable to the calculation of the actual speed of a ship.

[0056] In navigation, ocean currents are classified into three categories: steady currents, tidal currents, and wind-driven currents. Ships within these currents are assumed to move in accordance with the direction and speed of the current, without considering the deflection and relative displacement caused by the non-uniformity of the current. Steady currents can be estimated directly from relevant data, while wind-driven currents are relatively small and can be ignored. Therefore, this embodiment of the invention only considers the impact of tidal currents on the actual speed of ships, that is, quantitatively analyzing tidal currents through predicted tides.

[0057] Tidal currents can be viewed as the result of the superposition of countless sea surface waves with different periods and amplitudes. Therefore, to predict the tidal current at a certain point in time, it is only necessary to calculate the amplitude of each constituent tidal current at that point in time, and then superimpose them to obtain the tidal current at that point in time.

[0058] Because ship navigation routes are long, only a limited number of points can be calculated for tidal currents. Therefore, numerical interpolation is necessary to calculate the tidal current at any point. Considering accuracy and practicality, this embodiment uses a least-squares fitting interpolation mathematical model to interpolate between two points with known tidal currents. Using this method for tidal current forecasting achieves good results in wide sea areas. However, in nearshore waters, especially in channel gates, the forecasting error for flow direction and velocity is relatively large due to the influence of topographic factors on tidal currents. Further considerations are needed, such as real-time or timed regional monitoring to obtain the average tidal current in different areas.

[0059] Based on the above embodiments, as a preferred implementation, after obtaining the period and amplitude of each selected tidal constituent on the navigation route, the method further includes:

[0060] Tides with a period similarity greater than a preset similarity threshold are merged into a tidal group; the tidal group with the largest amplitude is determined, and the amplitudes of the remaining tidal groups are merged into the tidal group with the largest amplitude.

[0061] For tidal currents, there is usually only a few periods of observation data, making it very difficult to separate tidal constituents with similar periods. In this embodiment, a group of tidal constituents with similar periods is merged into the largest tidal constituent within that group.

[0062] Based on the above embodiments, as a preferred implementation, the superimposed amplitude of multiple points along the navigation route during the voyage time period for each tidal constituent is calculated. According to the theory in the above method, the tidal current calculation method specifically includes:

[0063] Obtain the northward component of the residual flow U 0; and according to the tidal harmonic constant U c angular velocity of tidal constituents q c Astronomical revision coefficient of tidal constituents after tidal constituent merger D c and zero-hour astronomical phase angle d c The dedicated lag angle of the northward component of the trend ζ c Determine the superimposed components of all tidal constituents in the northward direction; determine the northward component of the tidal current based on the northward component of the residual current and the superimposed components of all tidal constituents in the northward direction:

[0064]

[0065] In the above formula, c Indicates any tidal constituent. u ( t )express t The northward weight of the ever-changing trends.

[0066] Obtain the eastward component of the residual flow V 0; and according to the tidal harmonic constant U c angular velocity of tidal phase q c Astronomical revision coefficient of tidal constituents after tidal constituent merger D c and zero-hour astronomical phase angle d c The dedicated lag angle of the eastern component of the trend ζ c Determine the superimposed components of all tidal constituents in the eastward direction; determine the eastward component of the tidal current based on the eastward component of the residual current and the superimposed components of all tidal constituents in the eastward direction:

[0067]

[0068] In the above formula, c Indicates any tidal constituent. v ( t)express t The northward component of the instantaneous current; astronomical revision coefficient D c and zero-hour astronomical phase angle d c A function for dates.

[0069] It is understandable that tides are a natural phenomenon in coastal areas, referring to the periodic movement of seawater under the tidal force of celestial bodies (mainly the moon and the sun). In this embodiment, the vertical rise and fall of the sea surface is called tide, while the horizontal flow of seawater is called tidal current.

[0070] Based on the above embodiments, as a preferred implementation, the still water speed at any point on the navigation route is calculated according to the tidal forecast data and the set actual navigation speed during the voyage period, specifically including:

[0071] The ocean current speed at any point on the navigation route at any time is determined based on the tidal forecast data.

[0072] The time when the ship reaches any point is determined based on the navigation route and the set actual navigation speed, and the corresponding ocean current speed is extracted; the still water navigation speed required to maintain the set actual navigation speed is determined based on the velocity vector superposition method.

[0073] Based on the above embodiments, as a preferred implementation, the total fuel consumption of the navigation route is determined according to the instantaneous fuel consumption at any point, specifically including:

[0074] Based on the discretization multiplication method, the instantaneous fuel consumption at each point is multiplied by the sampling period to obtain the periodic fuel consumption within the corresponding sampling period. The total fuel consumption of the navigation route is obtained by summing all the periodic fuel consumptions.

[0075] In this embodiment, as Figure 2 As shown, the still water speed of the ship at each sampling point is obtained based on a preset constant speed (the actual sailing speed) and the current speed. This speed is then converted into an instantaneous fuel consumption value using the aforementioned still water fuel consumption model. To obtain the cumulative fuel consumption for the entire voyage, a discretized integration method can be used, which involves multiplying each instantaneous value by the sampling period and summing the results to obtain the total fuel consumption for the entire voyage.

[0076] After obtaining the flow velocity and direction, and combining the actual sailing speed set for the entire voyage, the still water speed of the ship can be obtained. The fuel consumption required to sail at this still water speed is equivalent to the work done after overcoming resistance, i.e., offsetting the fuel consumption required to counteract the speed against the current, or saving some energy by using thrust, i.e. due to the speed with the current.

[0077] The model relating a ship's speed to fuel consumption under calm conditions is called the still water fuel consumption model. In existing research, the naval coefficient is used for ship fuel efficiency analysis, and the formula for the naval coefficient includes speed. v Displacement Δ and ship propulsion power p The relationship between them is shown in the formula for the naval coefficient as follows:

[0078]

[0079] in c The naval coefficient is a constant. v It is the ship's speed. p Δ represents the ship's propulsion power, and △ represents the ship's displacement. According to the naval coefficient formula, in the naval coefficient... c When it is constant, the ship's propulsion power p With ship speed v The displacement of a ship is positively correlated with its weight (Δ). Generally speaking, a ship's propulsion power directly reflects its fuel consumption, and its displacement is its weight. Therefore, based on the above embodiments, as a preferred implementation, the following is also included:

[0080] Based on the ship's displacement Δ and sailing speed v Linear parameters c 1. Speed ​​index parameter c 2. Discharge Index Parameter c 3. Construct a still water fuel consumption model r F :

[0081]

[0082] Taking the logarithm of both sides of the equation for the still water fuel consumption model, we get:

[0083]

[0084] Obtain the hourly fuel consumption, speed, and displacement records of the ship during its calm water navigation history; transform the calm water fuel consumption model into a linear correlation function of a multivariate function; solve the linear correlation function based on the least squares method and the recorded information to obtain the model parameters of the calm water fuel consumption model.

[0085] To better implement the method for recommending port entry and exit in tidal river sections based on ship fuel consumption in the embodiments of the present invention, the embodiments of the present invention also provide a device for recommending port entry and exit in tidal river sections based on ship fuel consumption, such as... Figure 3 As shown, the tidal river section port entry and exit recommendation device 900 based on ship fuel consumption includes:

[0086] The tide forecast module 901 is used to determine the voyage time period and navigation route when the ship departs at different time windows; and to acquire tide forecast data along the navigation route within the voyage time period.

[0087] The still water speed calculation module 902 calculates the still water speed at any point on the navigation route based on the tide forecast data and the set actual navigation speed during the voyage time period.

[0088] The fuel consumption recommendation module 903 calculates the instantaneous fuel consumption at any point on the navigation route based on the still water speed and the pre-established still water fuel consumption model, determines the total fuel consumption of the navigation route based on the instantaneous fuel consumption at any point, and selects the time window with the minimum total fuel consumption for recommendation.

[0089] The device 900 for recommending port entry and exit in tidal river sections based on ship fuel consumption provided in the above embodiments can realize the technical solutions described in the embodiments of the method for recommending port entry and exit in tidal river sections based on ship fuel consumption. The specific implementation principles of each module or unit can be found in the corresponding content in the embodiments of the method for recommending port entry and exit in tidal river sections based on ship fuel consumption, and will not be repeated here.

[0090] like Figure 4 As shown, the present invention also provides a device 1000 for recommending port entry and exit in tidal river sections based on ship fuel consumption. This device 1000 includes a processor 1001, a memory 1002, and a display 1003. Figure 4 Only a portion of the components of the recommended equipment 1000 for tidal river entry and exit based on ship fuel consumption are shown. However, it should be understood that implementation of all shown components is not required, and more or fewer components may be implemented instead.

[0091] In some embodiments, the memory 1002 may be an internal storage unit of the tidal river section entry and exit recommendation device 1000 based on ship fuel consumption, such as a hard disk or memory of the tidal river section entry and exit recommendation device 1000. In other embodiments, the memory 1002 may also be an external storage device of the tidal river section entry and exit recommendation device 1000 based on ship fuel consumption, such as a pluggable hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the tidal river section entry and exit recommendation device 1000 based on ship fuel consumption.

[0092] Furthermore, the memory 1002 may include both internal storage units of the tidal river section entry and exit recommendation device 1000 based on ship fuel consumption and external storage devices. The memory 1002 is used to store application software and various types of data for installing the tidal river section entry and exit recommendation device 1000 based on ship fuel consumption.

[0093] In some embodiments, processor 1001 may be a central processing unit (CPU), microprocessor, or other data processing chip, used to run program code stored in memory 1002 or process data, such as the method for recommending entry and exit of tidal river sections based on ship fuel consumption in this invention.

[0094] In some embodiments, display 1003 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 1003 is used to display information from the tidal river section entry / exit recommendation device 1000 based on ship fuel consumption and to display a visual user interface. Components 1001-1003 of the tidal river section entry / exit recommendation device 1000 based on ship fuel consumption communicate with each other via a system bus.

[0095] In some embodiments of the present invention, when the processor 1001 executes the tidal river section entry and exit recommendation program based on ship fuel consumption in the memory 1002, the following steps can be implemented:

[0096] Determine the voyage time period and route when the ship departs in different time windows; obtain tidal forecast data along the route within the voyage time period;

[0097] Based on the tidal forecast data and the set actual sailing speed during the voyage time period, the still water sailing speed at any point on the sailing route is calculated.

[0098] Based on the still water speed and the pre-established still water fuel consumption model, the instantaneous fuel consumption at any point on the navigation route is calculated, and the total fuel consumption of the navigation route is determined based on the instantaneous fuel consumption at any point; the time window with the minimum total fuel consumption is selected for recommendation.

[0099] It should be understood that when the processor 1001 executes the recommendation program for entering and leaving ports in tidal river sections based on ship fuel consumption in the memory 1002, in addition to the functions mentioned above, it can also perform other functions, as can be found in the description of the corresponding method embodiments above.

[0100] Furthermore, this embodiment of the invention does not specifically limit the type of the tidal river entry and exit recommendation device 1000 based on ship fuel consumption mentioned above. The tidal river entry and exit recommendation device 1000 based on ship fuel consumption can be a mobile phone, tablet computer, personal digital assistant (PDA), wearable device, laptop computer, or other tidal river entry and exit recommendation device based on ship fuel consumption. Exemplary embodiments of the tidal river entry and exit recommendation device based on ship fuel consumption include, but are not limited to, tidal river entry and exit recommendation devices based on ship fuel consumption running iOS, Android, Microsoft, or other operating systems. The aforementioned tidal river entry and exit recommendation device based on ship fuel consumption can also be other tidal river entry and exit recommendation devices based on ship fuel consumption, such as laptop computers with touch-sensitive surfaces (e.g., touch panels). It should also be understood that, in some other embodiments of the present invention, the tidal river section entry and exit recommendation device 1000 based on ship fuel consumption may not be a tidal river section entry and exit recommendation device based on ship fuel consumption, but a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0101] Accordingly, this application also provides a computer-readable storage medium for storing computer-readable programs or instructions. When the programs or instructions are executed by a processor, they can implement the steps or functions of the above-described method embodiments for recommending entry and exit from tidal river sections based on ship fuel consumption.

[0102] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware (such as a processor, controller, etc.), and the computer program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0103] The above provides a detailed description of the method and apparatus for recommending entry and exit from tidal river sections based on ship fuel consumption provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for recommending port entry and exit in tidal river sections based on ship fuel consumption, characterized in that, include: Determine the voyage time period and route for the vessel when it departs in different time windows; The process of acquiring tidal forecast data along the navigation route during the voyage period includes: acquiring the period and amplitude of each selected tidal constituent along the navigation route; merging tidal constituents with a period similarity greater than a preset similarity threshold into a tidal constituent group; determining the tidal constituent with the largest amplitude in the tidal constituent group and merging the amplitudes of the remaining tidal constituents in the tidal constituent group into the tidal constituent with the largest amplitude; calculating the superimposed amplitude of each tidal constituent at multiple points along the navigation route during the voyage period to obtain tidal current forecast data for the corresponding multiple points; and performing numerical interpolation on the tidal current forecast data between any two adjacent points based on a least squares fitting interpolation mathematical model to obtain tidal forecast data along the navigation route. Based on the tidal forecast data and the set actual sailing speed during the voyage time period, the still water sailing speed at any point on the sailing route is calculated. Based on the still water speed and the pre-established still water fuel consumption model, the instantaneous fuel consumption at any point on the navigation route is calculated, and the total fuel consumption of the navigation route is determined based on the instantaneous fuel consumption at any point; the time window with the minimum total fuel consumption is selected for recommendation. The superimposed amplitudes of various tidal constituents at multiple points along the navigation route during the voyage period were calculated, specifically including: Obtain the northward component of the residual current; and determine the superimposed northward component of all tidal components based on the tidal harmonic constant, the angular rate of the tidal components, the astronomical revision coefficient of the merged tidal components and the zero-time astronomical phase angle, and the dedicated lag angle of the northward component of the tidal current; determine the northward component of the tidal current based on the northward component of the residual current and the superimposed northward component of all tidal components. Obtain the eastward component of the residual current; and determine the superimposed eastward component of all tidal components based on the tidal harmonic constant, the angular rate of the tidal components, the astronomical revision coefficient of the merged tidal components and the zero-time astronomical phase angle, and the dedicated lag angle of the eastward component of the tidal current; determine the eastward component of the tidal current based on the eastward component of the residual current and the superimposed eastward component of all tidal components. Also includes: Based on the ship's displacement Δ and sailing speed v Linear parameters c 1. Speed ​​index parameter c 2. Discharge index parameter c 3. Construct a still water fuel consumption model r F : Taking the logarithm of both sides of the equation for the still water fuel consumption model, we get: Obtain the hourly fuel consumption, speed, and displacement records of the ship during its calm water navigation history; transform the calm water fuel consumption model into a linear correlation function of a multivariate function; solve the linear correlation function based on the least squares method and the recorded information to obtain the model parameters of the calm water fuel consumption model.

2. The method for recommending port entry and exit in tidal river sections based on ship fuel consumption according to claim 1, characterized in that, Based on the tidal forecast data and the set actual sailing speed during the voyage period, the still water sailing speed at any point on the sailing route is calculated, specifically including: The ocean current speed at any point on the navigation route at any time is determined based on the tidal forecast data. The time when the ship reaches any point is determined based on the navigation route and the set actual navigation speed, and the corresponding ocean current speed is extracted; the still water navigation speed required to maintain the set actual navigation speed is determined based on the velocity vector superposition method.

3. The method for recommending port entry and exit in tidal river sections based on ship fuel consumption according to claim 1, characterized in that, The total fuel consumption of the navigation route is determined based on the instantaneous fuel consumption at any point, specifically including: Based on the discretization multiplication method, the instantaneous fuel consumption at each point is multiplied by the sampling period to obtain the periodic fuel consumption within the corresponding sampling period. The total fuel consumption of the navigation route is obtained by summing all the periodic fuel consumptions.

4. A device for recommending port entry and exit in tidal river sections based on ship fuel consumption, used to implement the method for recommending port entry and exit in tidal river sections based on ship fuel consumption as described in any one of claims 1 to 3, characterized in that, include: The tide forecast module is used to determine the voyage time period and navigation route when a ship departs at different time windows; Obtain tidal forecast data along the navigation route during the voyage period; The still water speed calculation module calculates the still water speed at any point on the navigation route based on the tidal forecast data and the set actual navigation speed within the voyage time period. The fuel consumption recommendation module calculates the instantaneous fuel consumption at any point on the navigation route based on the still water speed and the pre-established still water fuel consumption model, determines the total fuel consumption of the navigation route based on the instantaneous fuel consumption at any point, and selects the time window with the minimum total fuel consumption for recommendation.

5. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method for recommending port entry and exit in tidal river sections based on ship fuel consumption as described in any one of claims 1 to 3.

6. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the method for recommending port entry and exit in tidal river sections based on ship fuel consumption as described in any one of claims 1 to 3.

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