JP2019018641A - Ship performance analysis system and ship performance analysis method - Google Patents

Abstract

To provide a ship performance analysis system capable of making a highly accurate or optimal ship allocation plan.SOLUTION: The ship performance analysis system comprises a ship speed detector to detect a ship speed, a fuel consumption detector to detect fuel consumption of at least one of the main engines for propulsion, a display unit to display the plotted graph of the measuring points determined by the ship speed detected by the ship speed detector and by the fuel consumption detected by the fuel consumption detector, and an arithmetic unit to predict the future change of the performance deterioration rate based on the history of the performance deterioration rate while calculating the performance deterioration rate using the ship speed detected by the ship speed detector, the fuel consumption detected by the fuel consumption detector and the reference performance curve drawn by the relationship between the initial ship speed and fuel consumption.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a ship performance analysis system and a ship performance analysis method.

  When making a ship allocation plan for a specific ship (where to load and unload), the user determines the required time from the distance and speed, or the required speed from the distance and specified time, Consider the fuel consumption when.

  Conventionally, there are two types of graphs that are referred to when planning a ship assignment plan: the horizontal axis is the ship speed, the vertical axis is horsepower, the horizontal axis is horsepower, and the vertical axis is fuel consumption. .

Japanese Patent No. 5951140

  By the way, it is difficult to make a ship allocation plan while referring to the above two graphs. To deal with this, it is conceivable to create a graph with the horizontal axis representing ship speed and the vertical axis representing fuel consumption, and making a ship allocation plan while referring to this graph. For example, FIG. 7 of Patent Document 1 describes a graph in which the horizontal axis represents the ship speed and the vertical axis represents the fuel consumption. However, Patent Document 1 does not describe making a ship allocation plan with reference to the graph.

  However, when making a ship assignment plan with reference to the above graph, it is unclear how the ship's performance will change in the future, so it is not possible to make a highly accurate or optimal ship assignment plan. Have difficulty.

  Therefore, an object of the present invention is to provide a ship performance analysis system and a ship performance analysis method capable of making a highly accurate or optimal ship allocation plan.

  In order to solve the above problems, a ship performance analysis system according to the present invention includes a ship speed detector that detects a ship speed that is a ship speed, and a fuel consumption that detects a fuel consumption of at least one main engine for propulsion. A graph in which a detector and a reference performance curve are drawn, in which a measurement point determined by a ship speed detected by the ship speed detector and a fuel consumption detected by the fuel consumption detector is plotted And calculating the performance deterioration rate using the display device for displaying the ship speed detected by the ship speed detector, the fuel consumption detected by the fuel consumption detector, and the reference performance curve, And an arithmetic unit that predicts a future change in the performance deterioration rate from the history of the performance deterioration rate.

  According to the above configuration, when making a ship assignment plan, the relationship between the current ship speed and fuel consumption can be grasped by referring to only one graph, and the measurement point and the standard performance curve indicating the current performance are obtained. As a result, it is possible to grasp how much the current performance has deteriorated from the beginning, so that a ship allocation plan can be easily made. Moreover, in the present invention, the performance deterioration rate of the ship is calculated, and future changes in the performance deterioration rate are predicted. The calculated performance deterioration rate represents both a decrease in ship speed and an increase in the fuel consumption of the main engine. Therefore, if the future change in the predicted performance deterioration rate is utilized, An optimal ship allocation plan can be made. In addition, based on future changes in the performance deterioration rate, it is possible to estimate future fuel consumption and fuel cost, and to plan fuel loading.

  The arithmetic unit converts the fuel consumption detected by the fuel consumption detector into a corrected fuel consumption that can be compared with the reference performance curve, and the reference at the boat speed detected by the boat speed detector. The performance deterioration rate may be calculated from the fuel consumption on the performance curve and the corrected fuel consumption. According to this configuration, the performance deterioration rate indicates how much the fuel consumption has increased when the ship speed is assumed to be constant. Therefore, by referring to the performance deterioration rate, it is possible to grasp the increasing tendency of the fuel consumption of the main engine taking into account the decreasing tendency of the ship speed.

  The arithmetic unit converts the fuel consumption detected by the fuel consumption detector into a corrected fuel consumption that can be compared with the reference performance curve, and a ship speed on the reference performance curve in the corrected fuel consumption. The performance deterioration rate may be calculated from the ship speed detected by the ship speed detector. According to this configuration, the performance deterioration rate indicates how much the ship speed has decreased when the fuel consumption is assumed to be constant. Therefore, by referring to the performance deterioration rate, it is possible to grasp the tendency of the ship speed to decrease in consideration of the increase tendency of the fuel consumption of the main engine.

  The ship may be an LNG carrier, and the calculation device may calculate a heel amount during ballast voyage based on a future change in the performance deterioration rate. According to this configuration, the heel amount required for ballast voyage can be accurately calculated. Accordingly, when unloading the transported LNG, the LNG can be unloaded as much as possible by unloading the LNG so that the calculated heel amount remains for the next voyage.

  The ship performance analysis system further includes a data logger that stores the operation data of the ship, and the arithmetic device extracts specific data that affects the performance deterioration rate from the operation data stored in the data logger, The correlation between the performance deterioration rate and the specific data is learned, and a future change of the specific data is predicted, and the performance deterioration rate is calculated based on the predicted future change of the specific data. Future changes may be predicted. According to this configuration, the future prediction accuracy of the performance deterioration rate can be improved.

  The ship performance analysis system further includes a data logger that stores the operation data of the ship, and the arithmetic device learns a correlation between a route and a performance deterioration rate for each route in the operation data, and the operation Learn the correlation between the time and performance deterioration rate for each time in the data, and the same or similar to the planned route for the future voyage and the correlation between the performance deterioration rate and the scheduled time for the future voyage or A future change in the performance deterioration rate may be predicted based on the correlation between the similar period and the performance deterioration rate. According to this configuration, the future prediction accuracy of the performance deterioration rate can be improved.

  Further, the ship performance analysis method of the present invention defines the relationship between the step of detecting the ship speed, the step of detecting the fuel consumption of at least one propulsion main engine, and the initial ship speed and the fuel consumption. A graph on which a reference performance curve is drawn, on which a measuring point determined by the ship speed detected by the ship speed detector and the fuel consumption detected by the fuel consumption detector is plotted on the display device The step of displaying, the step of calculating the performance deterioration rate using the detected boat speed, the detected fuel consumption, and the reference performance curve, and the history of the performance deterioration rate, the performance deterioration rate Predicting future changes in the system. According to this structure, the same effect as the ship performance analysis system of this invention can be acquired.

  According to the present invention, it is possible to make a highly accurate or optimum ship allocation plan.

1 is a schematic configuration diagram of a ship performance analysis system according to an embodiment of the present invention. It is a schematic block diagram of an electric propulsion type ship. It is a schematic block diagram of a machine propulsion type ship. It is a schematic block diagram of another machine propulsion type ship. It is a graph in which a reference performance curve is drawn and measurement points are plotted. (A) is a graph which shows an initial speed horsepower curve, (b) is a graph which shows an initial reference fuel consumption curve. It is a graph which shows a time-dependent change of a performance deterioration rate. It is a graph which shows a time-dependent change of a hull fouling coefficient. It is a graph which shows change with time of propulsion efficiency. It is a graph which shows the future prediction of propulsion efficiency. It is a graph which shows the future prediction of a performance deterioration rate. It is a figure for demonstrating the calculation method of the performance deterioration rate of a modification.

  FIG. 1 shows a ship performance analysis system 1 according to an embodiment of the present invention. This ship performance analysis system 1 is for calculating the performance deterioration rate R of the ship 10 (see FIGS. 2 to 4), and includes a plurality of types of detectors, a computing device 2, and a data logger 21. The performance deterioration rate R represents both a decreasing tendency of the ship speed that is the speed of the ship 10 and an increasing tendency of the fuel consumption of the at least one propulsion main engine 41 mounted on the ship 10.

  The ship 10 may be an electric propulsion type as shown in FIG. 2 or a mechanical propulsion type as shown in FIGS. 3 and 4.

  As shown in FIG. 2, a plurality of main engines 41 for propulsion and power generation are mounted on the electric propulsion-type ship 10. The main machine 41 drives the generator 61, the electric power generated by the generator 61 is supplied to the motor 63 via the switchboard 62, and the propulsion shaft 52 is driven by the motor 63.

  In the ship 10 shown in FIG. 2, the main engine 41 is a reciprocating engine that uses fuel gas and fuel oil as fuel. And the supercharger 51 which pressurizes the supply air to the main machine 41 using the exhaust gas from the main machine 41 is connected to the main machine 41. However, the fuel of the reciprocating engine that is the main engine 41 may be either fuel gas or fuel oil. Alternatively, the main engine 41 may be a gas turbine engine that uses only fuel gas or fuel oil as fuel.

  As shown in FIGS. 3 and 4, a propulsion main machine 41 and a power generation auxiliary machine 42 are mounted on the mechanical propulsion-type ship 10. The number of main machines 41 may be one or plural. Similarly, the number of auxiliary machines 42 may be one or plural. The main machine 41 drives the propulsion shaft 52, and the auxiliary machine 42 drives the generator 64.

  In the ship 10 shown in FIG. 3, the main engine 41 is a reciprocating engine that uses fuel gas and fuel oil as fuel. And the supercharger 51 which pressurizes the supply air to the main machine 41 using the exhaust gas from the main machine 41 is connected to the main machine 41. However, the fuel of the reciprocating engine that is the main engine 41 may be either fuel gas or fuel oil. Alternatively, the main engine 41 may be a gas turbine engine that uses only fuel gas or fuel oil as fuel.

  In the ship 10 shown in FIG. 4, the main engine 41 is a combination of a boiler 43 that uses fuel gas and fuel oil as fuel, and a propulsion steam turbine 44 that drives the propulsion shaft 52. The steam generated in the boiler 43 is supplied not only to the propulsion steam turbine 44 but also to the power generation steam turbine 45. The steam turbine 45 drives a generator 65. However, the fuel of the boiler 43 that is a part of the main engine 41 may be either fuel gas or fuel oil.

  In the ship 10 shown in FIGS. 3 and 4, the auxiliary machine 42 is a reciprocating engine that uses fuel gas and fuel oil as fuel. However, the fuel of the reciprocating engine which is the auxiliary machine 42 may be either fuel gas or fuel oil.

  The ship 10 is provided with a ship speed detector 31, a fuel consumption detector 32, and the like as a plurality of types of detectors described above.

  The ship speed detector 31 detects the ship speed. In the present embodiment, the ship speed detector 31 detects the ship speed as the ground ship speed based on the position information of the ship 10 detected by GPS (Global Positioning System) or the like. However, the ship speed detector 31 may detect the ship speed as a speed against water using a Doppler log or an electromagnetic log.

  The fuel consumption amount detector 32 detects the fuel consumption amount Fo of the main engine 41. 2 to 4, the fuel consumption amount Fo is the sum of the fuel gas consumption amount and the fuel oil consumption amount.

  For example, in the ship 10 shown in FIG. 2, the fuel consumption detector 32 includes a flow meter 72 provided in a fuel gas supply line 71 that supplies fuel gas to each main engine 41, and fuel that supplies fuel oil to each main engine 41. A flow meter 74 provided in the oil supply line 73 and a flow meter 76 provided in a fuel oil recovery line 75 that recovers unused fuel oil from each main machine 41 are configured. The fuel oil recovery line 75 is connected to the fuel oil supply line 73 upstream of a pump (not shown), and the fuel oil circulates through the fuel oil supply line 73 and the fuel oil recovery line 75. That is, the consumption amount of fuel oil in each main engine 41 is a value obtained by subtracting the flow rate detected by the flow meter 76 from the flow rate detected by the flow meter 74. However, the fuel oil recovery line 75 may be omitted.

  In the ship 10 shown in FIG. 3, the fuel consumption detector 32 is connected to the flow meter 72 and the main engine 41 provided in the fuel gas supply line 71 for supplying the fuel gas to the main engine 41 as in the ship 10 shown in FIG. 2. A flow meter 74 provided in a fuel oil supply line 73 that supplies fuel oil, and a flow meter 76 provided in a fuel oil recovery line 75 that recovers unused fuel oil from the main engine 41 are configured.

  In the ship 10 shown in FIG. 4, the fuel consumption detector 32 includes a flow meter 92 provided in a fuel gas supply line 91 that supplies fuel gas to the boiler 43, and a fuel oil supply line that supplies fuel oil to the boiler 43. 93 includes a flow meter 94 provided in

  The ship speed V 1 detected by the ship speed detector 31 and the fuel consumption amount Fo of the main engine 41 detected by the fuel consumption detector 32 are input to the computing device 2.

  The arithmetic device 2 is a computer having a memory such as a ROM or a RAM and a CPU, for example, and a program stored in the ROM is executed by the CPU. The arithmetic device 2 may be mounted on the ship 10 or may be provided on land facilities capable of satellite communication with the ship 10. When the computing device 2 is provided in the land facility, the program may be provided to the computing device 2 through the Internet or the like without being stored in the memory of the computing device 2. Alternatively, the arithmetic device 2 may be configured by a ship-side arithmetic device mounted on the ship 10 and a land-side arithmetic device provided in the land facility.

  The computing device 2 calculates the current performance deterioration rate R of the ship 10 and predicts future changes in the performance deterioration rate R. A method for calculating the performance deterioration rate R and a method for predicting future changes will be described in detail later. Furthermore, in this embodiment, the arithmetic unit 2 calculates a hull fouling coefficient, propulsion efficiency, and the like. In addition, when the main machine 41 is a reciprocating engine and the supercharger 51 is connected to the main machine 41, the arithmetic device 2 calculates the supercharger efficiency and the like.

  The hull fouling coefficient is an index that indicates the degree of fouling of the hull. The propulsion shaft output (horsepower), ship speed, main engine speed, and heading measured in the actual sea area, as well as plain water (no wind, waves, or tidal currents) ) And the disturbance resistance due to wind, waves and tidal currents. The propulsion efficiency (η) is the ratio of the resistance (R) of a ship traveling at a constant speed (V) to the propulsion shaft output (P) required at that time (η = VR / P).

  The turbocharger efficiency indicates a deterioration in fuel consumption based on a decrease in the amount of air due to the contamination of the turbocharger 51, and is based on the work amount (main engine output) relative to the input fuel amount and the exhaust gas temperature (heat amount) Calculated based on thermal method).

  An input device 22 and a display device 23 are connected to the arithmetic device 2. The input device 22 is composed of a keyboard or the like, and receives input from the user. The display device 23 is, for example, a display, and displays the calculation result of the calculation device 2 (the history of performance deterioration rate R and future changes) on the screen.

  Further, the arithmetic unit 2 displays a graph with the horizontal axis indicating the ship speed and the vertical axis indicating the fuel consumption of the main engine 41 as shown in FIG. However, contrary to FIG. 5, the horizontal axis of the graph may be fuel consumption, and the vertical axis may be the boat speed. The memory of the arithmetic unit 2 stores in advance a reference performance curve C that defines the relationship between the initial ship speed and the fuel consumption. The graph shows the reference performance curve C. In the graph, the measurement points P determined by the ship speed V1 detected by the ship speed detector 31 and the fuel consumption Fo of the main engine 41 detected by the fuel consumption detector 32 are plotted. Although only one current measurement point P is plotted in FIG. 5, it is desirable that many past measurement points P are also plotted.

  The relationship between the initial ship speed and fuel consumption may be the relationship between the designed ship speed and fuel consumption, or may be based on the test results at the time of manufacture, or the sea trial operation results. It may be based on.

  The reference performance curve C is a combination of an initial speed horsepower curve C1 as shown in FIG. 6 (a) and an initial reference fuel consumption curve C2 as shown in FIG. 6 (b) based on the propulsion shaft output. is there. The speed horsepower curve C1 is a curve that defines the relationship between the initial propulsion shaft output and the ship speed, and the reference fuel consumption curve C2 is a curve that defines the relationship between the initial propulsion shaft output and fuel consumption. For example, the propulsion shaft output on the speed horsepower curve C1 at the ship speed V1 is Ps1, and the fuel consumption on the reference fuel consumption curve C2 at the propulsion shaft output Ps1 is Fs1.

  The data logger 21 stores operation data of the ship 10. The operation data stored in the data logger 21 includes not only the detection values of a plurality of types of detectors including the ship speed detector 31 and the fuel consumption detector 32 described above, and the route and timing of the actual voyage, The above-mentioned hull fouling coefficient, propulsion efficiency, supercharger efficiency, and the like calculated by the arithmetic device 2 are also included.

  Next, the method by which the arithmetic device 2 calculates the current performance deterioration rate R of the ship 10 will be described in detail.

  The computing device 2 calculates the performance deterioration rate R using the ship speed V1 detected by the ship speed detector 31, the fuel consumption Fo of the main engine 41 detected by the fuel consumption detector 32, and the reference performance curve C. To do. Specifically, the arithmetic device 2 first converts the detected fuel consumption amount Fo into a corrected fuel consumption amount F1 that can be compared with the reference performance curve C. The detected fuel consumption amount Fo is preferably calibrated by the arithmetic unit 2 based on the error of the flow meter confirmed at the time of shipment.

  Since the method of converting the fuel consumption amount Fo into the corrected fuel consumption amount F1 varies greatly depending on the configuration of the ship 10, the following description will be made using the ship 10 shown in FIGS.

(1) In the case of the ship 10 shown in FIG. 2 Although not shown in FIG. 2, a water-cooled air cooler is generally provided between the supercharger 51 and the reciprocating engine that is the main engine 41. First, the arithmetic unit 2 corrects the fuel consumption Fo by comparing the inlet air temperature and inlet air pressure of the supercharger 51, the inlet water temperature of the air cooler, the fuel gas heating value, the fuel oil heating value, and the like with the standard state. Then, the reference fuel consumption amount Fk is calculated. The standard state is a state when the reference performance curve C shown in FIG. 5 is derived.

  For example, when the inlet air temperature of the supercharger 51 is higher than the standard temperature, when the inlet air pressure of the supercharger 51 is lower than the standard pressure, or when the inlet water temperature of the air cooler is higher than the standard temperature, The arithmetic device 2 corrects the detected fuel consumption Fo so as to decrease. This is because, when these conditions are satisfied, the volume flow rate of air to be introduced into the reciprocating engine that is the main engine 41 increases, and the efficiency of the supercharger 51 is reduced accordingly, and the fuel consumption of the main engine 41 is deteriorated. In other words, it is considered that less fuel was sufficient in the standard state.

  When the calorific value of the fuel gas or fuel oil is higher than the standard calorific value, the arithmetic unit 2 corrects the detected fuel consumption amount Fo so as to increase. This is because when this condition was satisfied, a little more fuel was required in the standard state.

  After calculating the reference fuel consumption amount Fk (corrected fuel consumption amount Fo), the arithmetic unit 2 calculates the fuel consumption amount Fe required for the design ship power and the fuel consumption amount Fd required for propulsion.

The fuel consumption Fe required for the designed ship power is calculated based on the total power Et, the designed ship power Ed, and the actual ship power Er. For example, Fe can be calculated by the following formula.
Fe = Fk × (Er / Et) × (Ed / Er)
Since the above equation is also expressed as Fe = Fk × (Ed / Et), it is also possible to calculate the fuel consumption Fe required for the design ship power from only the total power Et and the design ship power Ed. is there.

The fuel consumption amount Fd necessary for propulsion is calculated based on the total electric power Et and the propulsion load El. For example, Fd can be calculated by the following equation.
Fd = Fk × (El / Et)

  Finally, the arithmetic device 2 calculates the corrected fuel consumption F1 by adding Fe and Fd (F1 = Fe + Fd).

(2) In the case of the ship 10 shown in FIG. 3 As in the case of the ship 10 shown in FIG. 2, the arithmetic unit 2 calculates a reference fuel consumption amount Fk. In the case of the ship 10 shown in FIG. 3, this reference fuel consumption amount Fk is the corrected fuel consumption amount F1.

(3) In the case of the ship 10 shown in FIG. 4 The arithmetic unit 2 calculates the fuel gas heating value, the fuel oil heating value, the outlet steam pressure and outlet temperature of the boiler 43, the pressure of the condenser (vacuum) not shown, and the like. The fuel consumption amount Fo is corrected as compared with the standard state, and the corrected fuel consumption amount F1 is calculated. The standard state is a state when the reference performance curve C shown in FIG. 5 is derived.

  For example, when the calorific value of the fuel gas or fuel oil is lower than the standard calorific value, the arithmetic device 2 corrects the detected fuel consumption amount Fo so as to decrease. Similarly, when the outlet steam pressure of the boiler 43 is lower than the standard pressure, when the outlet temperature of the boiler 43 is lower than the standard temperature, or when the condenser pressure is higher than the standard pressure, the arithmetic device 2 is Then, the detected fuel consumption amount Fo is corrected so as to be reduced.

The arithmetic unit 2 converts the detected fuel consumption Fo into the corrected fuel consumption F1, and then the fuel consumption Fs1 on the reference performance curve C and the corrected fuel at the boat speed V1 detected by the boat speed detector 31. The performance deterioration rate R is calculated from the consumption amount F1. That is, in this embodiment, the performance deterioration rate R indicates how much the fuel consumption has increased when the ship speed is assumed to be constant. In the present embodiment, the performance deterioration rate R is calculated by the following equation.
R = (F1-Fs1) / Fs1 × 100
That is, the performance deterioration rate R is a positive percentage as a general rule that the initial fuel consumption is zero. However, the performance deterioration rate R may be calculated by the following formula.
R = F1 / Fs1

  Prior to calculating the performance deterioration rate R, the computing device 2 may correct the boat speed V1 detected by the boat speed detector 31 based on at least one of wind information, wave information, and tidal current information. . In this case, the computing device 2 may acquire marine weather data including wind information, wave information, and tidal current information from, for example, an external organization such as the Japan Meteorological Agency or NOAA (National Ocean and Atmosphic Administration) via the Internet. However, when the ship speed detector 31 detects the ship speed against water, it is not necessary to correct the ship speed V1 based on the tidal current information.

  After calculating the performance deterioration rate R, the arithmetic device 2 predicts a future change in the performance deterioration rate R as shown by a broken line in FIG. 11 from the history of the performance deterioration rate R as shown in FIG. First, the computing device 2 creates an approximate curve based on the history of the performance deterioration rate R from the past to the present. For creating the approximate curve, a least square method or a Kalman filter may be used.

  Next, the computing device 2 creates an extension line obtained by extending the created approximate curve. The extension line may be a straight line or a curved line. For example, when the approximate curve is a straight line, the extension line may be a straight line on the same line as the approximate curve. Alternatively, when the approximate curve is a curve, the extension line may be a tangent to the approximate curve at the current performance deterioration rate R.

  In the present embodiment, the computing device 2 extracts specific data that affects the performance deterioration rate R from the operation data stored in the data logger 21. Among the operational data, the data affecting the performance deterioration include the hull fouling coefficient as shown in FIG. 8, the propulsion efficiency as shown in FIG. 9, the exhaust gas temperature of the main engine 41 (not shown), and the above-mentioned illustration (not shown). Such as turbocharger efficiency. The arithmetic device 2 selects the data having the strongest influence among the data as the specific data. For example, when the propulsion efficiency has the strongest influence on the performance deterioration rate R, the arithmetic device 2 learns the correlation between the performance deterioration rate R and the propulsion efficiency (specific data) from the past to the present.

  Thereafter, the arithmetic unit 2 predicts a future change in propulsion efficiency (specific data) as indicated by a broken line in FIG. Finally, the computing device 2 predicts a future change in the performance deterioration rate R based on the predicted future change in propulsion efficiency.

  As described above, in the ship performance analysis system 1 of the present embodiment, a graph as shown in FIG. 5 is displayed on the display device 23. Therefore, when making a ship allocation plan, only one graph is referred to. The relationship between the current ship speed and the fuel consumption can be grasped, and how much the current performance has deteriorated from the beginning can be grasped from the comparison between the measurement point P indicating the current performance and the reference performance curve C. Therefore, a ship allocation plan can be easily made.

  Moreover, in the present embodiment, the performance deterioration rate R of the ship 10 is calculated, and future changes in the performance deterioration rate R are predicted. Since the calculated performance deterioration rate R represents both the decreasing tendency of the ship speed and the increasing tendency of the fuel consumption of the main engine 41, the accuracy will be improved if the future change of the predicted performance deterioration ratio R is utilized. A high or optimal ship allocation plan can be made. Further, based on future changes in the performance deterioration rate R, it is possible to estimate future fuel consumption and fuel cost, and to plan fuel loading.

  For example, when the ship 10 is an LNG (Liquefied Natural Gas) carrier, the heel amount during ballast voyage may be calculated based on a future change in the performance deterioration rate R. In calculating the heel amount, sea weather data on the planned route of the ballast voyage is used, and a spray plan for cooling the cargo tank is taken into consideration. According to this configuration, the heel amount required for ballast voyage can be accurately calculated. Accordingly, when unloading the transported LNG, the LNG can be unloaded as much as possible by unloading the LNG so that the calculated heel amount remains for the next voyage.

  In the present embodiment, the performance deterioration rate R indicates how much the fuel consumption has increased when the ship speed is assumed to be constant. Therefore, by referring to the performance deterioration rate R, it is possible to grasp the increasing tendency of the fuel consumption of the main engine 41 in consideration of the decreasing tendency of the boat speed.

  Further, in the present embodiment, specific data that affects the ship speed is extracted from the operation data stored in the data logger 21, and the future change in the performance deterioration rate R is determined based on the future change in the specific data. Since it is predicted, the future prediction accuracy of the performance deterioration rate R can be improved.

(Modification)
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, the performance deterioration rate R may indicate how much the ship speed has decreased when it is assumed that the fuel consumption is constant. According to this configuration, by referring to the performance deterioration rate R, it is possible to grasp the decreasing tendency of the ship speed in consideration of the increasing tendency of the fuel consumption of the main engine 41.

Specifically, the arithmetic unit 2 converts the detected fuel consumption Fo into the corrected fuel consumption F1, and then, as shown in FIG. 12, the ship speed Vs1 on the reference performance curve C at the corrected fuel consumption F1. The performance deterioration rate R is calculated from the ship speed V1 detected by the ship speed detector 31. For example, the arithmetic device 2 calculates the performance deterioration rate R by the following equation.
R = (V1−Vs1) / Vs1 × 100
That is, the performance deterioration rate R may be a negative percentage in principle, with the initial ship speed being zero.

  In order to improve the future prediction accuracy of the performance deterioration rate R, the arithmetic device 2 may perform the following processing.

  First, the arithmetic unit 2 learns the correlation between the route and the performance deterioration rate R for each route based on the operation data stored in the data logger 21 and calculates the correlation between the time and the performance deterioration rate R for each time. learn. For example, the rate of change in the performance deterioration rate R differs between a route that is greatly affected by the westerly wind and a route that is not significantly affected by the westerly wind. The rate of change of the performance deterioration rate R may vary depending on the time. By time, for example, it may be by season or by month.

  The computing device 2 then correlates the performance deterioration rate R with the same or similar route as the planned route for the future voyage and the correlation between the performance deterioration rate R and the same or similar time as the scheduled time for the future voyage. Based on the above, a future change in the performance deterioration rate R is predicted.

DESCRIPTION OF SYMBOLS 1 Ship performance analysis system 10 Ship 2 Computation device 21 Data logger 23 Display device 31 Ship speed detector 32 Fuel consumption detector

Claims (10)

A ship speed detector that detects the ship speed, which is the speed of the ship;
A fuel consumption detector for detecting the fuel consumption of at least one propulsion main engine;
A display showing a reference performance curve, which is a graph in which measurement points determined by the ship speed detected by the ship speed detector and the fuel consumption detected by the fuel consumption detector are plotted. Equipment,
Using the ship speed detected by the ship speed detector, the fuel consumption detected by the fuel consumption detector, and the reference performance curve, a performance deterioration rate is calculated, and from the history of the performance deterioration rate A computing device for predicting future changes in the performance deterioration rate,
A ship performance analysis system comprising:   The arithmetic unit converts the fuel consumption detected by the fuel consumption detector into a corrected fuel consumption that can be compared with the reference performance curve, and the reference at the boat speed detected by the boat speed detector. The ship performance analysis system according to claim 1, wherein the performance deterioration rate is calculated from a fuel consumption amount on a performance curve and the corrected fuel consumption amount.   The arithmetic unit converts the fuel consumption detected by the fuel consumption detector into a corrected fuel consumption that can be compared with the reference performance curve, and a ship speed on the reference performance curve in the corrected fuel consumption. The ship performance analysis system according to claim 1, wherein the performance deterioration rate is calculated from the ship speed detected by the ship speed detector. The ship is an LNG carrier,
The ship performance analysis system according to any one of claims 1 to 3, wherein the arithmetic device calculates a heel amount during ballast voyage based on a future change in the performance deterioration rate. A data logger for storing operation data of the ship;
The arithmetic device extracts specific data that affects the performance deterioration rate from the operation data stored in the data logger, learns the correlation between the performance deterioration rate and the specific data, and
The future change of the specific data is predicted, and the future change of the performance deterioration rate is predicted based on the predicted future change of the specific data. Ship performance analysis system described in 1. A data logger for storing operation data of the ship;
The arithmetic device learns the correlation between the route and the performance deterioration rate for each route in the operation data, learns the correlation between the time and the performance deterioration rate for each time in the operation data, and
Based on the correlation between the performance deterioration rate and the same or similar route as the planned route for the future voyage, and the correlation between the performance deterioration rate and the same or similar time as the planned future voyage, The ship performance analysis system according to any one of claims 1 to 5, which predicts a future change. Detecting the ship speed;
Detecting fuel consumption of at least one propulsion main engine;
It is a graph in which a standard performance curve defining the relationship between the initial ship speed and fuel consumption is drawn, and the ship speed detected by the ship speed detector and the fuel consumption detected by the fuel consumption detector Displaying a graph in which measurement points determined by quantities are plotted on a display device;
Calculating a performance deterioration rate using the detected boat speed, the detected fuel consumption, and the reference performance curve;
Predicting future changes in the performance deterioration rate from the history of the performance deterioration rate;
Ship performance analysis method.   In the step of calculating the performance deterioration rate, the detected fuel consumption is converted into a corrected fuel consumption that can be compared with the reference performance curve, and the fuel consumption on the reference performance curve at the detected boat speed. The ship performance analysis method according to claim 7, wherein the performance deterioration rate is calculated from an amount and the corrected fuel consumption amount.   In the step of calculating the performance deterioration rate, the detected fuel consumption is converted into a corrected fuel consumption that can be compared with the reference performance curve, and a ship speed on the reference performance curve in the corrected fuel consumption is calculated. The ship performance analysis method according to claim 7, wherein the performance deterioration rate is calculated from the detected ship speed.   The ship performance analysis method according to any one of claims 7 to 9, further comprising a step of utilizing a prediction result of a future change in the performance deterioration rate in a maintenance plan.

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