Method for determining the liquid volume of an overlength tank of a ship and a calculating device

Abstract

The application discloses a kind of ship super-long liquid tank liquid volume determination method and computing device, ship super-long liquid tank liquid volume determination method includes: obtaining ship parameter information;According to the position of ship stern perpendicular, ship middle, bow perpendicular and ship middle deformation amount, fitting ship deformation curve;Calculate the deformation amount corresponding to liquid tank front end wall, the deformation amount corresponding to liquid tank rear end wall;Calculate ship trim influence factor;According to the position and reading of water gauge on ship, calculate the ship trim when not considering ship deformation;Calculate the actual ship trim influence caused by actual deformation of ship middle;Determine the ship trim formula corresponding to liquid tank;According to the obtained real-time water gauge reading of ship, calculate the real-time ship trim corresponding to liquid tank;Interpolation is determined in sounding table the liquid volume in liquid tank liquid.This application can accurately calculate the liquid volume of liquid tank.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a method for determining the liquid volume of an extra-long liquid tank of a ship and a calculation device. Background Art

[0002] At present, the volume of liquid in the liquid tank of the ship is generally obtained by directly reading the water level readings at the bow, middle and stern of the ship (calculating the ship's trim and roll) and the tank's sounding value, and then interpolating the value from the sounding table (which records the corresponding relationship between the liquid tank volume and the liquid tank's sounding value as well as the ship's trim and roll).

[0003] For short tanks, the ship's trim and list are calculated based on the draft gauge readings, and the liquid volume determined in the sounding table is relatively accurate. However, for extra-long tanks, especially those located near the main deck or double bottom, these are significantly affected by the hull's sagging and hogging deformation, and the tanks deform with the hull. Simply reading the draft gauge without considering the effects of hull deformation will result in an inaccurate estimate of the ship's trim, and the error in the liquid volume calculated using this result will also be significant, potentially reaching hundreds of cubic meters.

[0004] The crew reads the ship's draft gauge readings, calculates the ship's trim and heel, and directly uses them to interpolate the depth table to calculate the liquid volume. This method has the following problems:

[0005] 1. Because this method does not consider the impact of hull deformation on the calculation of ship trim, nor does it consider the impact of tank length and position on the calculation of ship trim, the same trim is used for all tanks to determine the volume; as a result, the volume determined in this way is inaccurate.

[0006] 2. The calculation error of liquid volume in extra-long liquid tanks is large, especially the inaccurate calculation of extra-long oil tank volume, which brings direct economic losses to shipping companies and affects the overall operation plan.

[0007] 3. The calculation error of the liquid volume in one or more extra-long liquid tanks is large, which brings troubles to the ship's cargo loading, stability and strength assessment, and affects the ship's navigation safety. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a method for determining the liquid volume of an extra-long liquid tank of a ship and a calculation device.

[0009] The present invention solves the above technical problems through the following technical solutions:

[0010] A method for determining the liquid volume of an extra-long liquid tank of a ship, comprising:

[0011] Get ship parameter information;

[0012] According to the positions of the ship's stern perpendicular, midship, and bow perpendicular as well as the midship deformation, the hull deformation curve is fitted;

[0013] Calculate the deformation corresponding to the front end wall and the rear end wall of the tank;

[0014] Calculate the ship's trim influencing factors;

[0015] Calculate the ship's trim without considering hull deformation based on the position and reading of the water gauge on board;

[0016] Calculate the actual trim effect of the ship caused by the actual deformation in the ship;

[0017] Determine the ship trim formula corresponding to the tank;

[0018] Calculate the real-time ship trim corresponding to the tank based on the real-time water gauge reading of the ship;

[0019] Determine the volume of liquid in the tank by interpolating from the soundings table.

[0020] Furthermore, in the step of obtaining ship parameter information, the ship parameter information includes the length between ship perpendiculars, the position of the selected liquid tank along the length of the ship, and the position of the water gauge from the forward perpendicular, midship, and aft perpendiculars.

[0021] Furthermore, in the step of fitting the hull deformation curve according to the positions of the ship's stern perpendicular, midship, and forward perpendicular and the midship deformation, the hull deformation curve is the hull deformation curve when the midship position is deformed by 1 m.

[0022] Furthermore, the step of calculating the deformation corresponding to the front end wall of the liquid tank and the deformation corresponding to the rear end wall of the liquid tank includes:

[0023] Based on the hull deformation curve and the position of the front and rear end walls of the liquid tank in the direction of the ship length, it is determined whether the front and rear end walls of the liquid tank are behind or in front of the midship, and the deformation A corresponding to the front end wall of the liquid tank and the deformation B corresponding to the rear end wall of the liquid tank are calculated.

[0024] Furthermore, the step of calculating the ship's trim influencing factor includes:

[0025] According to the formula C=(AB) / (X 液舱前壁 -X 液舱后壁 )×Lpp, calculate the ship's trim influence factor when the unit deformation in the ship is 1m, where C is the ship's trim influence factor; X 液舱前壁 is the position of the front wall of the tank in the direction of the ship's length; X 液舱后壁 is the position of the rear wall of the tank in the direction of the ship's length; Lpp is the length between the ship's perpendiculars.

[0026] Furthermore, the step of calculating the ship's trim without considering the hull deformation based on the position and reading of the water gauge on board the ship comprises:

[0027] Based on the position and reading of the draft gauge on board, calculate the draft reading T of the ship's stern perpendicular with the draft gauge reading as a variable. 尾垂线 , draught reading in the middle of the ship T 船中 , draught reading of the forward perpendicular line T 首垂线 , and then calculate the ship's trim TRIM with the water gauge reading as the variable; the water gauge reading on board includes T a 、T m 、T f , where T a T is the water gauge reading at the stern; m T is the water gauge reading in the ship; f The water gauge reading at the bow.

[0028] Furthermore, the steps of calculating the actual trim effect of the ship caused by the actual deformation in the ship include:

[0029] According to the formula △Trim=((T 尾垂线 +T 首垂线 ) / 2-T 船中 )×C, calculate the actual trim effect of the ship caused by the actual deformation amidships, where △Trim is the actual trim effect of the ship caused by the actual deformation amidships.

[0030] Furthermore, the step of determining the ship trim formula corresponding to the tank includes:

[0031] Determine the ship's trim formula for the tank: the ship's trim formula for the tank = TRIM - △Trim. The ship's trim formula for the tank is based on the water gauge reading T. a 、T m 、T f is a variable.

[0032] Furthermore, the step of calculating the real-time ship trim corresponding to the tank based on the acquired real-time water gauge reading of the ship includes:

[0033] The real-time ship trim corresponding to the tank is calculated based on the obtained real-time water gauge reading and the ship trim formula corresponding to the tank.

[0034] A device for calculating the liquid volume of an extra-long liquid tank of a ship, comprising:

[0035] Ship parameter information acquisition module, used to obtain ship parameter information;

[0036] The hull deformation curve fitting module is used to fit the hull deformation curve according to the positions of the ship's stern perpendicular line, midship line, and bow perpendicular line as well as the midship deformation;

[0037] A deformation calculation module is used to calculate the deformation corresponding to the front end wall of the liquid tank and the deformation corresponding to the rear end wall of the liquid tank;

[0038] Ship trim influence factor calculation module, used to calculate ship trim influence factor;

[0039] Theoretical ship trim calculation module, used to calculate the ship's trim without considering hull deformation based on the position and reading of the water gauge on board;

[0040] The module for calculating the actual trim effect of the ship is used to calculate the actual trim effect of the ship caused by the actual deformation of the ship;

[0041] A module for determining the ship's trim formula corresponding to the liquid tank, used to determine the ship's trim formula corresponding to the liquid tank;

[0042] The liquid tank real-time ship trim calculation module is used to calculate the real-time ship trim corresponding to the liquid tank based on the acquired ship real-time water gauge reading;

[0043] The liquid volume calculation module of the liquid tank is used to interpolate the liquid volume in the liquid tank in the depth table.

[0044] The beneficial effects of the present invention are as follows: the method of the present invention provides a method for determining the liquid volume of an extra-long liquid tank of a ship, so as to solve various practical operational problems caused by inaccurate calculation of the liquid volume of an extra-long liquid tank in the prior art. The present invention takes into account the influence of the actual deformation of the hull on the calculation of longitudinal inclination; for an extra-long liquid tank at any position of the ship, a corresponding longitudinal inclination formula is provided; it can be used to calculate the longitudinal inclination of the ship corresponding to any extra-long liquid tank under any draft state of the ship, and the result can be directly used in the depth meter to accurately calculate the liquid volume. The liquid volume in the liquid tank calculated by the present invention is extremely accurate. The present invention does not involve complex deformation parameters and complex calculation processes of the hull, but only uses the water level reading as a variable to provide a hull longitudinal inclination formula for each extra-long liquid tank. The present invention is universal for different ships and different liquid tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a flow chart of Example 1 of the present invention.

[0046] Figure 2 This is a structural diagram of Example 2 of the present invention. DETAILED DESCRIPTION

[0047] A preferred embodiment is given below and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0048] Example 1

[0049] An embodiment of the present invention provides a method for determining the liquid volume of an extra-long liquid tank of a ship.

[0050] like Figure 1 As shown, a method for determining the liquid volume of an extra-long liquid tank of a ship includes the following steps.

[0051] Step S1, obtaining ship parameter information.

[0052] In step S1, the ship parameter information includes the length between the ship's perpendiculars, the position of the selected tank along the length of the ship, and the position of the water gauge from the forward perpendicular, midship, and aft perpendiculars.

[0053] Step S2, fitting the hull deformation curve according to the positions of the ship's stern perpendicular, midship, and forward perpendicular as well as the midship deformation.

[0054] In step S2, the hull deformation curve is the hull deformation curve when the unit deformation at the midship position is 1m.

[0055] Step S3, calculating the deformation corresponding to the front end wall of the liquid tank and the deformation corresponding to the rear end wall of the liquid tank.

[0056] In step S3, based on the hull deformation curve and the positions of the front and rear end walls of the liquid tank in the direction of the ship length, it is determined whether the front and rear end walls of the liquid tank are behind or in front of the ship, and the deformation A corresponding to the front end wall of the liquid tank and the deformation B corresponding to the rear end wall of the liquid tank are calculated.

[0057] Step S4, calculating the ship's trim influence factor.

[0058] In step S4, according to the formula C=(AB) / (X 液舱前壁 -X 液舱后壁 )×Lpp, calculate the ship's trim influence factor when the unit deformation in the ship is 1m, where C is the ship's trim influence factor; X 液舱前壁 is the position of the front wall of the tank in the direction of the ship's length; X 液舱后壁 is the position of the rear wall of the tank in the direction of the ship's length; Lpp is the length between the ship's perpendiculars.

[0059] Step S5, calculating the ship's trim without considering the hull deformation based on the position and reading of the water gauge on board.

[0060] In step S5, based on the position and reading of the draft gauge on board, the draft reading T of the ship's stern perpendicular is calculated with the draft gauge reading as a variable. 尾垂线 , draught reading in the middle of the ship T 船中 , draught reading of the forward perpendicular line T 首垂线 , and then calculate the ship's trim TRIM with the water gauge reading as the variable; the water gauge reading on board includes T a 、T m 、T f , where T a T is the water gauge reading at the stern; m T is the water gauge reading in the ship; f The water gauge reading at the bow.

[0061] Step S6, calculating the actual trim effect of the ship caused by the actual deformation in the ship.

[0062] In step S6, according to the formula △Trim=((T 尾垂线 +T 首垂线 ) / 2-T 船中 )×C, calculate the actual trim effect of the ship caused by the actual deformation amidships, where △Trim is the actual trim effect of the ship caused by the actual deformation amidships.

[0063] Step S7: Determine the ship trim formula corresponding to the liquid tank.

[0064] In step S7, the ship trim formula corresponding to the liquid tank is determined, and the ship trim formula corresponding to the liquid tank is TRIM-△Trim. The ship trim formula corresponding to the liquid tank is based on the water gauge reading T a 、T m 、T f is a variable.

[0065] Step S8, calculating the real-time ship trim corresponding to the tank based on the acquired real-time water gauge reading of the ship.

[0066] In step S8, the real-time ship trim corresponding to the tank is calculated based on the acquired real-time water gauge reading and the ship trim formula corresponding to the tank.

[0067] Step S9: Determine the volume of the liquid in the tank by interpolating the depth table.

[0068] The method of the present invention provides a method for determining the liquid volume of an extra-long liquid tank of a ship, so as to solve various practical operation problems caused by inaccurate calculation of the liquid volume of an extra-long liquid tank in the prior art.

[0069] The method of this invention takes into account the impact of actual hull deformation on trim calculations. It provides a corresponding trim formula for any extra-long tank located anywhere on the ship. This formula can be used to calculate the trim corresponding to any extra-long tank at any draft. The result can be directly used in depth-sounding tables to accurately calculate liquid volume. The liquid volume within the tank calculated using this method is extremely accurate.

[0070] The method of the present invention does not involve complex deformation parameters and complex calculation processes of the hull, and only uses the water gauge reading as a variable to provide a hull longitudinal inclination formula for each extra-long liquid tank.

[0071] The method of the present invention is universal for different ships and different liquid tanks.

[0072] Example 2

[0073] An embodiment of the present invention also provides a device for calculating the liquid volume of an extra-long liquid tank of a ship.

[0074] like Figure 2 As shown, a device for calculating the liquid volume of an extra-long liquid tank of a ship includes a ship parameter information acquisition module 10, a hull deformation curve fitting module 20, a deformation amount calculation module 30, a ship trim influence factor calculation module 40, a theoretical ship trim calculation module 50, a ship actual trim influence calculation module 60, a ship trim formula determination module corresponding to the liquid tank 70, a liquid tank real-time ship trim calculation module 80, and a liquid volume calculation module 90 of the liquid tank.

[0075] The ship parameter information acquisition module 10 is used to acquire ship parameter information, including the length between ship perpendiculars, the position of the selected tank along the length of the ship, and the position of the water gauge from the forward perpendicular, midship, and aft perpendiculars.

[0076] The hull deformation curve fitting module 20 is used to fit the hull deformation curve according to the positions of the ship's stern perpendicular, midship, and forward perpendicular as well as the midship deformation. The hull deformation curve is the hull deformation curve when the midship position is deformed by 1m.

[0077] The deformation calculation module 30 is used to calculate the deformation corresponding to the front and rear end walls of the tank. Furthermore, the deformation calculation module is used to determine whether the front and rear end walls of the tank are located aft or aft of the midship based on the hull deformation curve and the position of the front and rear end walls of the tank in the ship's length direction, and to calculate the deformation A corresponding to the front and rear end walls of the tank and the deformation B corresponding to the rear end wall of the tank.

[0078] The ship trim influence factor calculation module 40 is used to calculate the ship trim influence factor. Further, the ship trim influence factor calculation module is used to calculate the ship trim influence factor according to the formula C=(AB) / (X 液舱前壁 -X 液舱后壁 )×Lpp, calculate the ship's trim influence factor when the unit deformation in the ship is 1m, where C is the ship's trim influence factor; X 液舱前壁 is the position of the front wall of the tank in the direction of the ship's length; X 液舱后壁 is the position of the rear wall of the tank in the direction of the ship's length; Lpp is the length between the ship's perpendiculars.

[0079] The theoretical ship trim calculation module 50 is used to calculate the ship trim without considering the hull deformation based on the position and reading of the water gauge on the ship. Furthermore, the theoretical ship trim calculation module is used to calculate the draft reading T of the ship's stern perpendicular line with the water gauge reading as a variable based on the position and reading of the water gauge on the ship. 尾垂线 , draught reading in the middle of the ship T 船中 , draught reading of the forward perpendicular line T 首垂线 , and then calculate the ship's trim TRIM with the water gauge reading as the variable; the water gauge reading on board includes T a 、T m 、T f , where Ta T is the water gauge reading at the stern; m T is the water gauge reading in the ship; f The water gauge reading at the bow.

[0080] The ship's actual trim effect calculation module 60 is used to calculate the ship's actual trim effect caused by the actual deformation in the ship. Further, the ship's actual trim effect calculation module is used to calculate the ship's actual trim effect according to the formula

[0081] △Trim=((T 尾垂线 +T 首垂线 ) / 2-T 船中 )×C,

[0082] Calculate the actual trim effect of the ship caused by the actual deformation amidships, where △Trim is the actual trim effect of the ship caused by the actual deformation amidships.

[0083] The ship trim formula determination module 70 corresponding to the liquid tank is used to determine the ship trim formula corresponding to the liquid tank. Further, the ship trim formula determination module corresponding to the liquid tank is used to determine the ship trim formula corresponding to the liquid tank, the ship trim formula corresponding to the liquid tank = TRIM-△Trim, the ship trim formula corresponding to the liquid tank is based on the water gauge reading T a 、T m 、T f is a variable.

[0084] The tank real-time ship trim calculation module 80 is used to calculate the corresponding real-time ship trim of the tank based on the acquired real-time ship draft reading. Furthermore, the tank real-time ship trim calculation module is used to calculate the corresponding real-time ship trim of the tank based on the acquired real-time ship draft reading and the corresponding ship trim formula.

[0085] The liquid volume calculation module 90 of the liquid tank is used to calculate the liquid volume in the liquid tank by interpolation in the depth measurement table.

[0086] By using the calculation device of the present invention, only a small amount of basic information needs to be input to accurately calculate the final result, which is accurate and reliable.

[0087] The present invention has universality for different ships and different liquid tanks.

[0088] The device for calculating the liquid volume of an extra-long tank on a ship provided in this embodiment has the same technical features as the method for determining the liquid volume of an extra-long tank on a ship provided in the aforementioned embodiment, solves the same technical problems, and achieves the same technical effects. Those skilled in the art will clearly understand that for ease and brevity of description, the specific operating procedures of the device described above can be referenced to the corresponding procedures in the aforementioned method embodiments and will not be further described here.

[0089] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A method for determining the liquid volume of an extra-long tank of a ship, characterized in that: It includes: Get ship parameter information; According to the positions of the ship's stern perpendicular, midship, and bow perpendicular as well as the midship deformation, the hull deformation curve is fitted; Calculate the deformation A corresponding to the front end wall of the tank and the deformation B corresponding to the rear end wall of the tank; Calculate the ship's trim influencing factors; The ship's trim influence factor for a unit deformation of 1 m amidships is calculated using the formula C = (AB) / (X tank front wall - X tank rear wall) × Lpp, where C is the ship's trim influence factor; X tank front wall is the position of the tank front wall in the ship's length; X tank rear wall is the position of the tank rear wall in the ship's length; and Lpp is the length between ship perpendiculars. Calculate the ship's trim without considering hull deformation based on the position and reading of the water gauge on board; Based on the position and reading of the draft gauge on board, calculate the draft reading T of the ship's stern perpendicular with the draft gauge reading as a variable. 尾垂线 , draught reading in the middle of the ship T 船中 , draught reading of the forward perpendicular line T 首垂线 , and then calculate the ship's trim TRIM with the water gauge reading as the variable; the water gauge reading on board includes T a 、T m 、T f , where T a T is the water gauge reading at the stern; m T is the water gauge reading in the ship; f Take the draft gauge reading for the bow; Calculate the actual trim effect of the ship caused by the actual deformation in the ship; According to the formula △Trim=((T 尾垂线 +T 首垂线 ) / 2-T 船中 )×C, calculate the actual trim effect of the ship caused by the actual deformation in the ship, where △Trim is the actual trim effect of the ship caused by the actual deformation in the ship; Determine the ship's trim formula corresponding to the tank; the ship's trim formula corresponding to the tank = TRIM-△Trim, the ship's trim formula corresponding to the tank is based on the water gauge reading T a 、T m 、T f is a variable; Calculate the real-time ship trim corresponding to the tank based on the real-time water gauge reading of the ship; Determine the volume of liquid in the tank by interpolating from the soundings table.

2. The method for determining the liquid volume of an extra-long tank of a ship according to claim 1, characterized in that: In the step of obtaining the ship parameter information, the ship parameter information includes the length between the ship's perpendiculars, the position of the selected liquid tank along the length of the ship, and the position of the water gauge from the forward perpendicular, the midship, and the aft perpendicular.

3. The method for determining the liquid volume of an extra-long tank of a ship according to claim 1, characterized in that: According to the positions of the ship's stern perpendicular, midship, and forward perpendicular and the midship deformation, in the step of fitting the hull deformation curve, the hull deformation curve is the hull deformation curve when the midship position is deformed by 1 meter.

4. The method for determining the liquid volume of an extra-long tank of a ship according to claim 3, characterized in that: The steps of calculating the deformation corresponding to the front end wall of the liquid tank and the deformation corresponding to the rear end wall of the liquid tank include: Based on the hull deformation curve and the position of the front and rear end walls of the liquid tank in the direction of the ship length, it is determined whether the front and rear end walls of the liquid tank are behind or in front of the midship, and the deformation A corresponding to the front end wall of the liquid tank and the deformation B corresponding to the rear end wall of the liquid tank are calculated.

5. The method for determining the liquid volume of an extra-long tank of a ship according to claim 4, characterized in that: The steps of calculating the real-time ship trim corresponding to the tank based on the obtained real-time water gauge reading of the ship include: The real-time ship trim corresponding to the tank is calculated based on the obtained real-time water gauge reading and the ship trim formula corresponding to the tank.

6. A device for calculating the liquid volume of an extra-long tank of a ship, characterized in that: It is used to perform the method according to claim 1, which includes: Ship parameter information acquisition module, used to obtain ship parameter information; The hull deformation curve fitting module is used to fit the hull deformation curve according to the positions of the ship's stern perpendicular line, midship line, and bow perpendicular line as well as the midship deformation; A deformation calculation module is used to calculate the deformation corresponding to the front end wall of the liquid tank and the deformation corresponding to the rear end wall of the liquid tank; Ship trim influence factor calculation module, used to calculate ship trim influence factor; Theoretical ship trim calculation module, used to calculate the ship's trim without considering hull deformation based on the position and reading of the water gauge on board; The module for calculating the actual trim effect of the ship is used to calculate the actual trim effect of the ship caused by the actual deformation of the ship; A module for determining the ship's trim formula corresponding to the liquid tank, used to determine the ship's trim formula corresponding to the liquid tank; The liquid tank real-time ship trim calculation module is used to calculate the real-time ship trim corresponding to the liquid tank based on the acquired ship real-time water gauge reading; The liquid volume calculation module of the liquid tank is used to interpolate the liquid volume in the liquid tank in the depth table.

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