CN113682443B - Theoretical daily fuel oil consumption determination method of VLCC ship under instruction navigational speed - Google Patents

Theoretical daily fuel oil consumption determination method of VLCC ship under instruction navigational speed Download PDF

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CN113682443B
CN113682443B CN202111091880.4A CN202111091880A CN113682443B CN 113682443 B CN113682443 B CN 113682443B CN 202111091880 A CN202111091880 A CN 202111091880A CN 113682443 B CN113682443 B CN 113682443B
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CN113682443A (en
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韩东升
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Cosco Shipping Technology Beijing Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B71/00—Designing vessels; Predicting their performance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F9/00—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/15—Vehicle, aircraft or watercraft design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/10—Measures concerning design or construction of watercraft hulls

Abstract

The method for determining the theoretical daily fuel consumption of the VLCC ship at the command navigational speed comprises the following steps: establishing a stall model; acquiring real-time data of a VLCC ship, and filtering the acquired real-time data to obtain required navigation and meteorological data; determining the true wind speed, the true wind direction, the wave height, the wave period and the wave direction of the position of the VLCC ship according to the navigation and meteorological data; determining a stall coefficient of the VLCC ship at the position according to the established stall model and the navigation and meteorological data; further determining the ideal still water navigational speed of the VLCC ship; then determining the daily average ideal still water navigational speed of the VLCC ship; and finally, determining the theoretical daily fuel consumption of the VLCC ship at the daily average ideal still water navigational speed, and determining the theoretical daily fuel consumption of the VLCC ship at the instructed navigational speed.

Description

Theoretical daily fuel oil consumption determination method of VLCC ship under instruction navigational speed
Technical Field
The application belongs to the technical field of navigation and oceans, particularly belongs to the technical field of energy conservation and emission reduction in the navigation field, and particularly relates to a method for determining theoretical daily fuel consumption of a VLCC ship at a command navigational speed.
Background
In shipping enterprises, the oil consumption cost occupies the total cost of the operation of most fleets. The global environment is seriously affected by the emission of carbon dioxide generated by the operation of ships. Accordingly, the total amount of carbon emissions generated by the operation of a VLCC vessel is controlled and reduced in order to improve energy efficiency of the vessel's voyage. The fuel oil needs to be reasonably predicted and monitored, so that the fuel consumption is expected to be reduced, and the market competitiveness of a fleet can be remarkably enhanced.
Usually, the navigation speed and the navigation direction are determined mainly through manual experience judgment so as to reduce oil consumption, most information is filled and reported by ship workers and is input into an information system, the operation process not only occupies manpower and causes wrong report and missing report, but also the time for transmitting data back to land is long, ship conditions and sea conditions cannot be fed back in real time, and the ship oil consumption monitoring condition is not ideal.
With the progress of information technology, the information technology is also gradually adopted to further analyze the oil consumption condition. Therefore, for shipping enterprises, it is a great trend to effectively improve the economy and environmental protection of operating ships through data driving.
Disclosure of Invention
In view of the above, on one hand, some embodiments disclose a method for determining theoretical daily fuel consumption of a VLCC ship at a commanded navigational speed, the method comprising:
establishing a stall model;
acquiring real-time data of the VLCC ship, and filtering the acquired real-time data to obtain required navigation data;
determining the true wind speed, the true wind direction, the wave height, the wave period and the wave direction of the position of the VLCC ship according to the navigation data;
determining a stall coefficient of the VLCC ship at the position according to the stall model and the obtained navigation data;
determining an ideal still water navigational speed of the VLCC ship;
determining the daily average ideal hydrostatic navigational speed of the VLCC ship;
determining the theoretical daily fuel consumption of the VLCC ship under the daily average ideal still water navigational speed, wherein the calculation formula is as follows:
Figure BDA0003267648120000021
wherein V isS0The daily average ideal still water navigational speed of the VLCC ship is saved; mefo (V)S0) Is a VS0The corresponding VLCC ship consumes ton of engine oil every day; t is the daily sailing time of the VLCC ship in hours; f. ofcargoFor the cargo capacity utilization, the ballast is taken to be 1; y is1Age of the ship, year; n is a radical ofMCRRated rotating speed of the main machine, rpm; y is2The current time of the last dock repair is year; c. C1、c2、c3And c4As fitting coefficient, at full load c1Is 0.2276, c2Is 0.2351, c3Is-6.780, c40.035, at ballast time c1Is 0.1457, c2Is 0.1660, c3Is-4.155, c40.035;
determining the theoretical daily fuel consumption of the VLCC ship at the instructed navigational speed, wherein the calculation formula is as follows:
Figure BDA0003267648120000022
wherein fo (Vref) is the theoretical daily fuel consumption of the VLCC ship under the command navigational speed, Mefo is the fuel consumption of the main engine, GeBoilerFo is the fuel consumption of the auxiliary engine boiler, and V isSFor the average water-to-water speed, V, of a VLCC shipS0Is the daily average ideal hydrostatic navigational speed, V, of a VLCC shiprefTo command navigational speed, Mefo (V)ref) And Mefo (V)S0) For VLCC vessels at VrefAnd Vs0Theoretical daily fuel consumption.
Further, in some embodiments, the real-time data includes a marine sailing speed, an offshore sailing speed, a wind direction, a wave height, a wave direction, a wave period, a host rotation speed, a sailing distance, a sailing time, a host oil consumption, and an auxiliary boiler oil consumption of the VLCC ship.
Some embodiments disclose a method for determining theoretical daily fuel consumption of a VLCC ship at a commanded navigational speed, true wind speed UwindCalculated from the following formula:
Figure BDA0003267648120000023
the true wind direction δ is calculated by:
δ＝atan2(VWR sin(ψWR+α)-VG sinα，VWR cos(ψWR+α)-VG cosα)
wherein, VGThe speed of the VLCC ship to the ground is taken, m/s and alpha are the course of the VLCC ship and are expressed by radian; vWRIs wind speed, m/s; psiWRIs the wind direction, expressed in radians;
the wave height is calculated by:
Figure BDA0003267648120000031
the wave period is calculated by:
Figure BDA0003267648120000032
wave direction is calculated by:
Figure BDA0003267648120000033
wherein HsiIs the wave height, m, of the ith point around the VLCC ship; t isziIs the wave period, s, of the ith point around the VLCC ship; beta is aiIs the main wave direction, deg, of the ith point around the VLCC ship; w is ainIs the total weight of the position of the ith point; the value of i is 1, 2, 3 and 4; wherein, winCalculated from the following formula:
Figure BDA0003267648120000034
wherein wiThe position weight of the ith point is calculated by the following formula:
Figure BDA0003267648120000035
wherein d isiIs the distance between the ith point and the VLCC vessel.
Some embodiments disclose a method for determining theoretical daily fuel consumption of a VLCC ship at a commanded cruise speed, the stall coefficient calculated by:
Figure BDA0003267648120000036
wherein:
Figure BDA0003267648120000037
Figure BDA0003267648120000038
VTW＝Uwind*cos(α-δ)
AT＝AT0+(T0-Tm)*B
wherein f islossIs the stall coefficient; hsWave height, m; t iszWave period, s; beta is wave direction, rad; u shapewindThe wind speed is the true wind speed and the unit is m/s; delta is true wind direction, expressed in radians; α is the VLCC vessel heading, expressed in radians; tm is the average draft of the VLCC ship, m; b is VLCC ship width, m; lpp is the vertical line length, m; t is0M for design draught; a. theT0To design the draught area, m2，cTzThe wave period influence coefficient; c. CwdThe wave direction influence coefficient; vTWThe wind speed is positive windward, m/s; a. theTIs the positive windward area, m2。
Some embodiments disclose a method for determining theoretical daily fuel consumption of a VLCC ship at a commanded navigational speed, wherein an ideal still water navigational speed is calculated by the following formula:
VS0＝VS/(1-floss)
wherein, VSIs the actual speed of the water, i.e. the actual speed of the VLCC vessel relative to the water in the wind waves.
In another aspect, some embodiments disclose a computer-readable medium containing computer-executable instructions that, when processed by a data processing device, perform a method for determining theoretical daily fuel consumption of a VLCC vessel at a commanded cruise speed.
In yet another aspect, some embodiments disclose a system comprising computer-executable instructions that, when executed, process the computer-executable instructions to perform a method for determining theoretical daily fuel consumption of a VLCC vessel at a commanded cruise.
In yet another aspect, some embodiments disclose an apparatus comprising a processor, a memory, and a computer program stored on the memory and executable by the processor, the computer program, when executed by the processor, implementing a method for determining theoretical daily fuel consumption for a VLCC vessel at a commanded cruise speed.
The method for determining the theoretical daily fuel consumption of the VLCC ship at the instructed navigational speed can accurately and efficiently determine the theoretical daily fuel consumption of the VLCC ship at the instructed navigational speed based on the acquired implementation data and the established prediction model, timely and accurately master the actual fuel consumption condition, is favorable for reasonably determining the navigational speed and the heading direction, reduces the fuel consumption, and improves the economical efficiency and the environmental protection performance of the operation of the VLCC ship.
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FIG. 1 embodiment 1VLCC ship theoretical daily fuel consumption determination method under instruction navigational speed
Detailed Description
The word "embodiment" as used herein, is not necessarily to be construed as preferred or advantageous over other embodiments, including any embodiment illustrated as "exemplary". Unless otherwise indicated, the performance indicators tested in the examples herein were tested using methods routine in the art. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; other test methods and techniques not specifically mentioned in the present application are those commonly employed by those of ordinary skill in the art.
The terms "substantially" and "about" are used herein to describe small fluctuations. For example, they may mean less than or equal to ± 5%, such as less than or equal to ± 2%, such as less than or equal to ± 1%, such as less than or equal to ± 0.5%, such as less than or equal to ± 0.2%, such as less than or equal to ± 0.1%, such as less than or equal to ± 0.05%. Numerical data represented or presented herein in a range format is used merely for convenience and brevity and thus should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range. For example, a numerical range of "1 to 5%" should be interpreted to include not only the explicitly recited values of 1% to 5%, but also include individual values and sub-ranges within the indicated range. Thus, included in this numerical range are individual values, such as 2%, 3.5%, and 4%, and sub-ranges, such as 1% to 3%, 2% to 4%, and 3% to 5%, etc. This principle applies equally to ranges reciting only one numerical value. Moreover, such an interpretation applies regardless of the breadth of the range or the characteristics being described. In the method disclosed in the present application, the sequence of steps involved is only included for illustrative purposes, and the time sequence in actual operation is not strictly limited, unless the time sequence is inconsistent with the context or logical errors when the steps are performed in other sequences.
In this document, including the claims, conjunctions such as "comprising," including, "" carrying, "" having, "" containing, "" involving, "" containing, "and the like are understood to be open-ended, i.e., to mean" including but not limited to. The conjunctions "consisting of … …" and "consisting of … …" are closed conjunctions.
In the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In the examples, some methods, means, instruments, apparatuses, etc. well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.
On the premise of no conflict, the technical features disclosed in the embodiments of the present application may be combined arbitrarily, and the obtained technical solution belongs to the content disclosed in the embodiments of the present application.
In some embodiments, a method of determining theoretical daily fuel consumption of a VLCC vessel at a commanded cruise speed comprises:
establishing a stall model; generally, historical data can be used as a basis, historical data is regressed to obtain a stall calculation formula as a stall model, the stall model obtained on the basis of a certain amount of historical data can be used as a theoretical basis, and the actual stall coefficient of the VLCC ship is reasonably determined by combining the obtained VLCC ship real-time data, so that the ideal hydrostatic navigational speed of the VLCC ship can be further obtained;
acquiring real-time data of a VLCC ship, and filtering the acquired real-time data to obtain required navigation and meteorological data; generally, the real-time data includes navigation data and meteorological data, and as an optional embodiment, the navigation data and the meteorological data are acquired every other hour; filtering the acquired real-time data according to a set rule to obtain required navigation data and meteorological data;
determining the true wind speed, the true wind direction, the wave height, the wave period and the wave direction of the position of the VLCC ship according to the navigation data;
determining a stall coefficient of the VLCC ship at the position according to the stall model and the obtained navigation and meteorological data;
determining an ideal still water navigational speed for the location of the VLCC vessel, typically one time per hour, for example;
determining the daily average ideal hydrostatic navigational speed of the VLCC ship;
determining the theoretical daily fuel consumption of the VLCC ship under the daily average ideal still water navigational speed, wherein the calculation formula is as follows:
Figure BDA0003267648120000061
in the formula (1), wherein VS0The daily average ideal still water navigational speed of the VLCC ship is saved; mefo (V)S0) Is a VS0The corresponding VLCC ship consumes ton of engine oil every day; t is the daily sailing time of the VLCC ship in hours; f. ofcargoThe ballast is taken as 1 for the utilization rate of the cargo capacity, namely the cargo capacity is divided by the load weight of ton; y is1The age of the ship, namely the time from ship delivery to calculation, is taken as a unit of year; n is a radical ofMCRRated rotation speed of the main engine, rpm; y is2The current time of the last dock repair is year; c. C1、c2、c3And c4As fitting coefficient, at full load c1Is 0.2276, c2Is 0.2351, c3Is-6.780, c40.035, at ballast time c1Is 0.1457, c2Is 0.1660, c3Is-4.155, c40.035; wherein, the daily engine oil consumption of the VLCC ship is theoretical daily fuel oil of the VLCCConsumption;
determining the theoretical daily fuel consumption of the VLCC ship at the instructed navigational speed, wherein the calculation formula is as follows:
Figure BDA0003267648120000071
in the formula (2), Fo (V)ref) For the theoretical daily fuel consumption of the VLCC ship under the command of navigational speed, Mefo is the fuel consumption of the main engine, GeBoilerFo is the fuel consumption of the auxiliary engine boiler, and VS0Is the daily average ideal hydrostatic navigational speed, V, of a VLCC shiprefTo command navigational speed, Mefo (V)ref) And Mefo (V)S0) For VLCC vessels at VrefAnd Vs0The next day the theoretical consumption of fuel.
As an optional embodiment, the real-time data includes marine navigation speed, opposite-shore navigation speed, wind direction, wave height, wave direction, wave period, host rotation speed, navigation distance, navigation time, host oil consumption, and auxiliary boiler oil consumption of the VLCC ship. When filtering the real-time data, the following rules may be followed, for example:
the voyage time is not less than 15 hours;
the sailing speed to water and the speed to ground both need to satisfy more than 7 sections and less than 16 sections, which are generally referred to as GPS sailing speed;
single-day effective voyage, meteorological data quantity rules: the number of effective data acquired by the equipment is more than or equal to 85% multiplied by sailing hours, and the effective data is rounded downwards;
average speed of water-in-the-day greater than 10kn & less than 16 knots;
the absolute value of the difference between the average speed over water and the average speed over ground on the day is less than 2 knots;
the average rotational speed per day is greater than 30 rpm;
wave height less than 2m, typically referred to as weather forecast wave height;
load-case rules: the average draught is 19.5-23 when the vehicle is fully loaded, and the cargo capacity is more than 200000; the average draught is 8.5-10 and the cargo capacity is 0 during ballast;
as an alternative embodiment, the true wind speed UwindIs calculated by the following formulaCalculating:
Figure BDA0003267648120000072
the true wind direction δ is calculated by:
δ＝atan2(VWR sin(ψWR+α)-VG sinα，VWR cos(ψWR+α)-VG cosα)……(4)
in the formulae (3) and (4), VGThe speed of the VLCC ship to the ground is taken, m/s and alpha are the course of the VLCC ship and are expressed by radian; vWRIs wind speed, m/s; psiwRWind direction, expressed in radians.
Generally, VGThe SPEED of the VLCC ship to the ground is read by the equipment as GPS _ SPEED; α ═ GPS _ TRACK _ progress × 3.1415926/180, which is the heading of the VLCC vessel read by the equipment; vWRMWV _ WIND _ SPEED, the WIND SPEED read by the device; psiWRMWV _ WIND _ ANGLE 3.1415926/180, the WIND direction read by the device, converted to an arc system representation.
Wave data computation
Generally, sea wave information is forecasted at certain time intervals, dynamic wave information within the time intervals cannot be obtained in real time, and for convenience of calculation, wave information between the time intervals of the forecast wave information needs to be obtained according to a certain algorithm and serves as a simulation value to represent actual wave information. The present embodiment performs calculation by a four-point interpolation method to obtain a simulated value as a prediction standard, specifically, the method includes:
(1) obtaining the VLCC vessel offshore location by equipment: lon (longitude), LAT (latitude), time T (UTC time).
(2) According to the coordinates, wave information of 4 coordinates around the VLCC ship is searched: for example, the four latitude and longitude points P closest to the ship's point of interest (LON: 113.6, LAT: 112.6, T: 2020-06-0611: 33:56) are determined1～P4And rounding the longitude and latitude downwards and adding 1, so that the coordinates of the four acquired points are respectively as follows:
P1：(LON：113，LAT：112，T：2020-06-06 11:33:56)；
P2：(LON：114，LAT：112，T：2020-06-06 11:33:56)；
P3：(LON：113，LAT：113，T：2020-06-06 11:33:56)；
P4：(LON：114，LAT：113，T：2020-06-06 11:33:56)；
(3) calculating the average value of the wave information of the four points as the wave information of the position of the ship;
specifically, four coordinate points P at a certain time are queried1～P4Wave parameters of (3) to obtain Hsi(measurement unit is m), Tzi(the measurement unit is s) and betai(the measurement unit is radian deg) three wave parameters, and the wave parameter of the position of the VLCC ship at the moment is obtained by adopting a four-point method interpolation, wherein the interpolation method comprises the following steps:
(3.1) calculation of P1～P4Distance d from the target point VLCC vessel position1～d4
Figure BDA0003267648120000081
Lon in formula (5)i，LatiRespectively the longitude and latitude of the ith point, wherein the value of i is 1, 2, 3 and 4;
(3.2) calculation of P1～P4Weight w of1～w4
Figure BDA0003267648120000091
In the formula (6), diIs the distance between the ith point and the VLCC vessel position, where wiThe position weight of the ith point is shown, and the values of i are 1, 2, 3 and 4;
(3.3) weight normalization, calculating the final weight w1n～w4n
Figure BDA0003267648120000092
In the formula (7), winIs the total weight of the position of the ith point, wiThe position weight of the ith point is shown, and the values of i are 1, 2, 3 and 4;
(3.4) calculating the wave parameter of the position of the target point VLCC ship according to the weight coefficient
The wave height is calculated by:
Figure BDA0003267648120000093
the wave period is calculated by:
Figure BDA0003267648120000094
wave direction is calculated by:
Figure BDA0003267648120000095
in the formulae (8), (9), (10), HsiIs the wave height, m, of the ith point around the VLCC ship; t isziIs the wave period, s, of the ith point around the VLCC ship; beta is aiIs the main wave direction, deg, of the ith point around the VLCC ship; w is ainIs the total weight of the position of the ith point; the value of i is 1, 2, 3 and 4.
And obtaining wave information of the position of the ship as actual wave information of the VLCC ship in a wave information prediction time interval.
As an alternative embodiment, the stall coefficient is calculated by:
Figure BDA0003267648120000096
Figure BDA0003267648120000097
Figure BDA0003267648120000101
VTW＝Uwind*cos(α-δ)……(14)
AT＝AT0+(T0-Tm)*B……(15)
in formulae (11), (12), (13), (14), (15), flossIs the stall coefficient; hsIs the sense wave height, m; t iszIs the average period of the wave, s; beta is the major wave direction, rad; u shapewindThe wind speed is true wind speed, m/s; δ is true wind direction, expressed in radians; α is the VLCC vessel heading, expressed in radians; t ismIs the average draft of the VLCC ship, m; b is VLCC ship width, m; lpp is the vertical line length, m; t is0M for design draught; a. theT0To design the draught area, m2；cTzThe wave period influence coefficient; cwdThe wave direction influence coefficient; vTWThe wind speed is positive windward, m/s; a. theTIs the positive windward area, m2；
As an alternative embodiment, the ideal still water navigational speed is calculated by the following formula:
VS0＝VS/(1-floss)……(16)
in the formula (16), VSIs the actual speed of the VLCC vessel relative to the water in the wind waves.
Generally, the obtained ideal still water navigational speed can be used as the speed of the VLCC ship in the wave information prediction time interval, in order to obtain the daily average ideal still water navigational speed of the VLCC ship in one day, the ideal still water navigational speeds at all wave information prediction time interval points in one day need to be averaged to obtain the daily average ideal still water navigational speed, for example, the passing time zone limit of the VLCC ship in navigation can be used as the prediction time interval, the ideal still water navigational speed of each time zone is arithmetically averaged, the obtained average value is used as the daily average ideal still water navigational speed, and the daily host engine oil consumption of the VLCC ship is calculated.
In some embodiments, the daily average ideal hydrostatic navigational speed of the VLCC vessel and the daily host engine oil consumption of the VLCC vessel are determined as a time period intercepted beginning at 12:00 PM of the local time the VLCC vessel is underway and ending at 12:00 PM of the second day.
In another aspect, embodiments disclose a computer-readable medium containing computer-executable instructions that, when processed by a data processing device, execute a method for determining theoretical daily fuel consumption of a VLCC vessel at a commanded navigational speed. Generally, computer executable instructions or program code for performing some embodiments of the present disclosure are written in one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, Python, and conventional procedural programming languages, such as the "C" programming language or similar programming languages, or combinations thereof. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
In yet another aspect, some embodiments disclose a system comprising computer-executable instructions that, when executed, process the computer-executable instructions to perform a method for determining theoretical daily fuel consumption of a VLCC vessel at a commanded cruise.
In yet another aspect, some embodiments disclose an apparatus comprising a processor, a memory, and a computer program stored on the memory and executable by the processor, the computer program, when executed by the processor, implementing a method for determining theoretical daily fuel consumption for a VLCC vessel at a commanded cruise speed.
As an alternative embodiment, the method may be a computer device with a computer executable system built therein, and the system, when running on the computer device, executes the theoretical daily fuel consumption determination method for the VLCC vessel at the commanded speed.
As an alternative embodiment, a computer device may be provided, which includes a processor, a memory and a network interface connected by a system bus, wherein the memory may include a nonvolatile storage medium and an internal memory, and the memory stores a computer program executable by the processor;
the non-volatile storage medium may store an operating system and a computer program. The computer program includes program instructions that, when executed, cause a processor to perform a method of determining theoretical daily fuel consumption for any one of the VLCC vessels at a commanded navigational speed;
the processor is used for providing calculation and control capacity and supporting the operation of the whole computer equipment;
the internal memory provides an environment for running a computer program in a nonvolatile storage medium, and the computer program can enable a processor to execute a theoretical daily fuel consumption determination method of the VLCC ship at a command navigational speed when being executed by the processor;
the network interface is used for network communications, and those skilled in the art will appreciate that a particular computer device may include more or fewer components, or combine certain components, or have a different arrangement of components;
it should be understood that the Processor may be a Central Processing Unit (CPU), and the Processor may be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, etc. Wherein a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The technical details are further illustrated in the following examples.
Example 1
Fig. 1 is a block diagram of a flow chart of a method for determining theoretical daily fuel consumption of a VLCC ship at a commanded navigational speed, as disclosed in embodiment 1.
Specifically, the method for determining the theoretical daily fuel consumption of the VLCC ship at the commanded navigational speed disclosed in embodiment 1 includes the steps of:
s1, establishing a stall model;
s2, acquiring real-time data of the VLCC ship, and filtering the acquired real-time data to obtain required navigation data and meteorological data;
s3, determining the true wind speed, the true wind direction, the wave height, the wave period and the wave direction of the position of the VLCC ship according to the navigation data and the meteorological data;
s4, determining a stall coefficient of the VLCC ship at the position according to the stall model established in the step S1, the navigation data and the meteorological data obtained in the step S2, and the true wind speed, the true wind height, the wave period and the wave direction obtained in the step S3;
s5, determining the ideal hydrostatic navigational speed of the position of the VLCC ship;
s6, determining the daily average ideal hydrostatic navigational speed of the VLCC ship;
s7, determining the theoretical daily fuel consumption of the VLCC ship under the daily average ideal still water navigational speed;
and S8, determining the theoretical daily fuel consumption of the VLCC ship at the command navigational speed.
The method for determining the theoretical daily fuel consumption of the VLCC ship at the instructed navigational speed can accurately and efficiently determine the theoretical daily fuel consumption of the VLCC ship at the instructed navigational speed based on the acquired implementation data and the established prediction model, timely and accurately master the actual fuel consumption condition, is favorable for reasonably determining the navigational speed and the heading direction, reduces the fuel consumption, and improves the economical efficiency and the environmental protection performance of the operation of the VLCC ship.
The technical solutions and the technical details disclosed in the embodiments of the present application are only examples to illustrate the inventive concept of the present application, and do not constitute a limitation on the technical solutions of the present application, and all the conventional changes, substitutions, combinations, and the like made to the technical details disclosed in the present application have the same inventive concept as the present application and are within the protection scope of the claims of the present application.

Claims (7)

  1. A method for determining theoretical daily fuel consumption of a VLCC ship at a commanded navigational speed is characterized by comprising the following steps:
    establishing a stall model;
    acquiring real-time data of a VLCC ship, and filtering the acquired real-time data to obtain required navigation and meteorological data;
    calculating and determining the true wind speed, the true wind direction, the wave height, the wave period and the wave direction of the position of the VLCC ship according to the navigation and meteorological data;
    determining a stall coefficient of the VLCC ship at the position according to the stall model and the obtained navigation data;
    the stall coefficient is calculated by:
    Figure FDA0003612004390000011
    wherein:
    Figure FDA0003612004390000012
    Figure FDA0003612004390000013
    VTW＝Uwind*cos(α-δ)
    AT＝AT0+(T0-Tm)*B
    wherein f islossIs the stall coefficient; hsWave height, m; t iszWave period, s; beta is wave direction, rad; u shapewindThe wind speed is the true wind speed and the unit is m/s; delta is true wind direction, expressed in radians; α is the VLCC vessel heading, expressed in radians; t ismIs the average draft of the VLCC ship, m; b is VLCC ship width, m; lpp is the vertical line length, m; t is0M for design draught; a. theT0To design the draught area, m2，cTzIs a wave period shadowA coefficient of loudness; c. CwdThe wave direction influence coefficient; vTWThe wind speed is positive windward wind speed, m/s; a. theTIs the positive windward area, m2；
    Determining an ideal still water navigational speed of the VLCC ship;
    determining daily average ideal hydrostatic navigational speed of the VLCC ship;
    determining the theoretical daily fuel consumption of the VLCC ship at the daily average ideal still water navigational speed, wherein the calculation formula is as follows:
    Figure FDA0003612004390000014
    wherein V isS0The daily average ideal still water navigational speed of the VLCC ship is saved; mefo (V)S0) Is a VS0The corresponding VLCC ship consumes ton of engine oil every day; t is the daily sailing time of the VLCC ship in hours; f. ofcargoFor the cargo capacity utilization, the ballast is taken to be 1; y is1Age of the ship, year; n is a radical of hydrogenMCRRated rotating speed of the main machine, rpm; y is2The current time of the last dock repair is year; c. C1、c2、c3And c4As fitting coefficient, at full load c1Is 0.2276, c2Is 0.2351, c3Is-6.780, c40.035, at ballast time c1Is 0.1457, c2Is 0.1660, c3Is-4.155, c40.035;
    determining the theoretical daily fuel consumption of the VLCC ship at the instructed navigational speed, wherein the calculation formula is as follows:
    Figure FDA0003612004390000021
    wherein Fo (V)ref) For the theoretical daily fuel consumption of the VLCC ship under the command of navigational speed, Mefo is the fuel consumption of the main engine, GeBoilerFo is the fuel consumption of the auxiliary engine boiler, and VS0Is the daily average ideal hydrostatic navigational speed, V, of a VLCC shiprefIs a command navigational speed; mefo (V)ref) And Mefo (V)S0) For VLCC vessels at VrefAnd Vs0Theoretical daily fuel consumption.
  2. 2. The method of claim 1, wherein the real-time data includes speed of the VLCC vessel at sea, speed of the vessel offshore, wind speed, wind direction, wave height, wave direction, wave period, host speed, distance traveled, time of the vessel, host oil consumption, and auxiliary boiler oil consumption.
  3. 3. The method of claim 1, wherein the method comprises the steps of:
    the true wind speed UwindCalculated from the following formula:
    Figure FDA0003612004390000022
    the true wind direction δ is calculated by:
    δ＝atan2(VWRsin(ψWR+α)-VGsinα,VWRcos(ψWR+α)-VGcosα)
    wherein, VGThe speed of the VLCC ship to the ground is taken, m/s and alpha are the course of the VLCC ship and are expressed by radian; vWRIs wind speed, m/s; psiWRIs the wind direction, expressed in radians;
    the wave height is calculated by:
    Figure FDA0003612004390000023
    the wave period is calculated by:
    Figure FDA0003612004390000031
    the wave direction is calculated by:
    Figure FDA0003612004390000032
    wherein HsiIs the wave height, m, of the ith point around the VLCC ship; t isziIs the wave period, s, of the ith point around the VLCC ship; beta is aiIs the main wave direction, deg, of the ith point around the VLCC ship; w is ainIs the total weight of the position of the ith point; the value of i is 1, 2, 3 and 4; wherein, winCalculated from the following formula:
    Figure FDA0003612004390000033
    wherein, wiThe position weight of the ith point is calculated by the following formula:
    Figure FDA0003612004390000034
    wherein d isiIs the distance between the ith point and the VLCC vessel.
  4. 4. The method of claim 1, wherein the ideal hydrostatic navigational speed is calculated from the equation:
    VS0＝VS/(1-floss)
    wherein, VS0Ideal hydrostatic navigational speed, VSIs the actual speed of the VLCC vessel relative to the water in the wind waves.
  5. 5. A computer readable medium containing computer executable instructions, wherein the computer executable instructions when processed by a data processing device perform the method of determining theoretical daily fuel consumption at a commanded cruise speed for a VLCC vessel as claimed in any of claims 1 to 4.
  6. 6. A system comprising computer executable instructions which when executed process the computer executable instructions to perform the method of determining theoretical daily fuel consumption at a commanded cruise speed for a VLCC vessel as claimed in any of claims 1 to 4.
  7. 7. An apparatus comprising a processor, a memory, and a computer program stored on the memory and executable by the processor, the computer program when executed by the processor implementing a method of determining theoretical daily fuel consumption at a commanded cruise for a VLCC vessel as claimed in any of claims 1 to 4.
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