Determination method and calculation device for liquid volume of super-long liquid tank of ship

Abstract

The invention discloses a method for determining the liquid volume of a super-long liquid tank of a ship and a computing device. The method for determining the liquid volume of the super-long liquid tank of the ship comprises the following steps: acquiring ship parameter information; fitting a hull deformation curve according to the positions of the stern vertical line, the midship and the head vertical line of the ship and the midship deformation; 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; calculating a ship trim influence factor; according to the position and the reading of the water gauge on the ship, ship trim without considering ship body deformation is calculated; calculating actual ship trim influence caused by actual deformation in the ship; determining a ship trim formula corresponding to the liquid tank; calculating real-time ship trim corresponding to the liquid tank according to the obtained real-time water gauge reading of the ship; and interpolating in the sounding table to determine the volume of the liquid in the liquid tank. The liquid volume of the liquid tank can be accurately calculated.

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 ship's liquid tank is generally obtained by directly reading the bow, middle and stern water gauge readings of the ship (calculating the ship's trim and list) and the tank's sounding values, and then interpolating the value from the sounding table (which records the corresponding relationship between the tank volume and the tank's sounding value as well as the ship's trim and list).

[0003] For short tanks, the trim and heel of the ship are calculated based on the water gauge readings, and the liquid volume determined in the depth gauge is relatively accurate. However, for extra-long tanks, especially extra-long oil tanks arranged near the main deck or double bottom of the ship, they are greatly affected by the hull mid-sag / mid-arch deformation, and the tanks deform with the hull deformation. Only by reading the ship's water gauge readings without considering the influence of hull deformation, the ship's trim obtained is not accurate, and the error of the liquid volume calculated using this result is also large, which may reach hundreds of cubic meters.

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

[0005] 1. Since this method does not consider the influence of hull deformation on the calculation of ship trim, nor the influence of tank length and position on the calculation of ship trim, the same trim is used for all tanks to determine the volume; resulting in the volume determined in this way is not accurate.

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

[0007] 3. The error in calculating 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 to 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 tank of a ship, comprising:

[0011] Get ship parameter information;

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

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

[0014] Calculate the ship trim influence factor;

[0015] Calculate the ship's trim without considering the 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] Interpolate from the soundings table to determine the volume of liquid in the tank.

[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, the midship, and the stern perpendicular.

[0021] Further, in the step of fitting the hull deformation curve according to the positions of the ship's stern perpendicular, midship, and bow 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 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 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 trim influence 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 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] Further, the step of calculating the trim of the ship without considering the deformation of the hull according to the position and reading of the water gauge on the ship comprises:

[0027] Based on the position and reading of the water gauge on board, calculate the draft reading T of the ship's stern perpendicular with the water gauge reading as a variable. 尾垂线 , Draft 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 step of calculating the actual trim effect of the ship caused by the actual deformation in the ship includes:

[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 in the ship, where △Trim is the actual trim effect of the ship caused by the actual deformation in the ship.

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

[0031] Determine the ship trim formula corresponding to the tank, the ship trim corresponding to the tank = TRIM-△Trim, the ship trim formula corresponding to 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 according to the acquired real-time water gauge reading of the ship includes:

[0033] According to the obtained real-time water gauge reading of the ship and the ship trim formula corresponding to the liquid tank, the real-time ship trim corresponding to the liquid tank is calculated.

[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 module for fitting the hull deformation curve is used to fit the hull deformation curve according to the positions of the ship's stern perpendicular line, midship, bow perpendicular line and 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 trim without considering the hull deformation according to 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 in the ship;

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

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

[0043] The liquid volume calculation module of the liquid tank is used to interpolate and calculate 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 has universality 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 schematic diagram of the structure 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 bow 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 mid-ship position is 1m.

[0055] Step S3, calculating the deformation amount corresponding to the front end wall of the liquid tank and the deformation amount 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 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 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 according to the position and reading of the water gauge on board.

[0060] In step S5, based on the position and reading of the water gauge on board, the draft reading T of the ship's stern perpendicular is calculated with the water gauge reading as a variable. 尾垂线 , Draft 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 in the ship, where △Trim is the actual trim effect of the ship caused by the actual deformation in the ship.

[0063] Step S7, determining the ship trim formula corresponding to the liquid tank.

[0064] In step S7, the ship trim formula corresponding to the tank is determined. The ship trim formula corresponding to the tank = TRIM-△Trim. The ship trim formula corresponding to the 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 according to the acquired real-time water gauge reading of the ship.

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

[0067] Step S9, interpolating the depth table to determine the volume of liquid in the tank.

[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 the present invention takes into account the influence of the actual deformation of the hull on the calculation of trim; provides a corresponding trim formula for an extra-long liquid tank at any position of the ship; can be used to calculate the trim 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.

[0070] The method of the 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 trim formula for each extra-long liquid tank.

[0071] The method of the present invention is universal to 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 stern 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 bow perpendicular and the midship deformation. The hull deformation curve is the hull deformation curve when the midship position unit deforms by 1m.

[0077] The deformation calculation module 30 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. Further, the deformation calculation module is used to determine whether the front and rear bulkheads of the liquid tank are behind or in front of the midship based on the hull deformation curve and the positions of the front and rear end walls of the liquid tank in the length direction, and calculate 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.

[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 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 according to the position and reading of the water gauge on the ship. Further, 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 , Draft 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 This is the water gauge reading at the bow.

[0080] The actual ship trim effect calculation module 60 is used to calculate the actual ship trim effect caused by the actual deformation in the ship. Further, the actual ship trim effect calculation module is used to calculate the actual ship 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 in the ship, where △Trim is the actual trim effect of the ship caused by the actual deformation in the ship.

[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, and 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 real-time ship trim corresponding to the tank according to the acquired real-time ship water gauge reading. Further, the tank real-time ship trim calculation module is used to calculate the real-time ship trim corresponding to the tank according to the acquired real-time ship water gauge reading and the ship trim formula corresponding to the tank.

[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 of a ship provided in this embodiment has the same technical features as the method for determining the liquid volume of an extra-long tank of a ship provided in the above embodiment, and can solve the same technical problems and achieve the same technical effects. A person skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the above device can refer to the corresponding process in the above method embodiment, and will not be repeated here.

[0089] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection 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, but these changes and modifications all fall within the protection 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, bow perpendicular and the midship deformation, the hull deformation curve is fitted; Calculate the deformation corresponding to the front end wall of the tank and the deformation corresponding to the rear end wall of the tank; Calculate the factors affecting ship trim; Calculate the ship's trim without considering the hull deformation based on the position and reading of the water gauge on board; Calculate the actual trim effect of the ship caused by the actual deformation in the ship; Determine the ship trim formula corresponding to the tank; Calculate the real-time ship trim corresponding to the tank based on the real-time water gauge reading of the ship; Interpolate from the soundings table to determine the volume of liquid in the tank.

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 stern 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 bow 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 1m.

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 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 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 for calculating the ship's trim influence factor include: 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 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.

6. The method for determining the liquid volume of an extra-long tank of a ship according to claim 5, characterized in that: Based on the position and reading of the water gauge on board, the steps for calculating the ship's trim without considering the hull deformation include: Based on the position and reading of the water gauge on board, calculate the draft reading T of the ship's stern perpendicular with the water gauge reading as a variable. 尾垂线 , Draft 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 This is the water gauge reading at the bow.

7. The method for determining the liquid volume of an extra-long tank of a ship according to claim 6, characterized in that: The steps to calculate the actual trim effect of the ship caused by the actual deformation in the ship include: 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.

8. The method for determining the liquid volume of an extra-long tank of a ship according to claim 7, characterized in that: The steps to determine the ship trim formula corresponding to the tank include: Determine the ship trim formula corresponding to the tank, the ship trim corresponding to the tank = TRIM-△Trim, the ship trim formula corresponding to the tank is based on the water gauge reading T a 、T m 、T f is a variable.

9. The method for determining the liquid volume of an extra-long tank of a ship according to claim 8, characterized in that: The steps of calculating the real-time ship trim corresponding to the tank according to the obtained real-time ship water gauge reading include: According to the obtained real-time water gauge reading of the ship and the ship trim formula corresponding to the liquid tank, the real-time ship trim corresponding to the liquid tank is calculated.

10. A device for calculating the liquid volume of an extra-long tank of a ship, characterized in that: It includes: Ship parameter information acquisition module, used to obtain ship parameter information; The module for fitting the hull deformation curve is used to fit the hull deformation curve according to the positions of the ship's stern perpendicular line, midship, bow perpendicular line and 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 trim without considering the hull deformation according to 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 in the ship; A module for determining a ship trim formula corresponding to a liquid tank, used to determine a ship trim formula corresponding to a liquid tank; The tank real-time ship trim calculation module is used to calculate the real-time ship trim corresponding to the tank according to the acquired ship real-time water gauge reading; The liquid volume calculation module of the liquid tank is used to interpolate and calculate the liquid volume in the liquid tank in the depth table.

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