Method, device and equipment for determining the height of the center of gravity of an empty ship and storage medium

Abstract

The application relates to the ship technology field and discloses a method, device and equipment for determining the height of the center of gravity of an empty ship and a storage medium, the method comprising the following steps: determining initial waterline parameters of a truss type platform where the empty ship is located; moving a heavy block on the truss type platform to obtain a roll angle; determining the float center coordinate value of the empty ship under the roll angle through a static water force curve, the static water force curve representing the lateral coordinate and the vertical coordinate of the float center of the truss type platform under different roll angles; and performing data processing on the float center coordinate value, the displacement of the empty ship, the weight of the heavy block and the initial waterline parameters to obtain the height of the center of gravity of the empty ship. Since the roll angle is obtained by moving the heavy block on the truss type platform to determine the float center coordinate value of the empty ship, the height of the center of gravity of the empty ship can be determined by performing data processing on the float center coordinate value, the test error caused by the asymmetric in-out water volume during the traditional inclination test can be effectively avoided, and the method is applicable to any truss type platform.

Description

Technical Field

[0001] This invention relates to the field of marine technology, and in particular to a method, apparatus, equipment, and storage medium for determining the center of gravity height of an empty ship. Background Technology

[0002] The height of a ship's center of gravity is an important parameter affecting its stability and safety. After a ship is completed, it is generally necessary to measure the center of gravity of the empty ship through an inclining test. The purpose is to obtain the ship's empty weight, the position of the empty ship's center of gravity, and the ship's initial stability state, so as to verify the ship's completed stability and actual load capacity.

[0003] Traditional tilting tests typically determine the center of gravity (G) using the initial stability height (GM). However, this method requires a small tilt angle (<4°) and that the submerged and emerged volumes of the hull be consistent. For platforms where the submerged and emerged volumes are inconsistent, accurately determining the G from the GM value becomes difficult. Furthermore, modern truss platforms often have numerous struts, making it difficult to avoid experimental errors caused by asymmetrical submerged and emerged volumes during tilting tests, leading to inaccurate measurements of the ship's center of gravity.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this invention is to provide a method, apparatus, equipment, and storage medium for determining the center of gravity height of an empty ship, aiming to solve the technical problem that the traditional tilting test method suffers from test errors caused by asymmetrical inlet and outlet water volumes, resulting in inaccurate measurement of the ship's center of gravity height.

[0006] To achieve the above objectives, the present invention provides a method for determining the center of gravity height of an empty ship, the method comprising the following steps:

[0007] Determine the initial waterline parameters of the truss platform on which the empty ship is located, the truss platform including the weight block;

[0008] The weight block is moved on the truss platform to obtain the tilt angle of the truss platform;

[0009] The coordinates of the center of buoyancy of the empty vessel at the specified heel angle are determined by the hydrostatic curve. The hydrostatic curve represents the lateral and vertical coordinates of the center of buoyancy of the truss platform at different heel angles.

[0010] The center of gravity height of the empty ship is obtained by processing the coordinates of the buoyancy center, the displacement of the empty ship, the weight of the heavy block, and the initial waterline parameters.

[0011] Optionally, after moving the weight block on the truss platform to obtain the tilt angle of the truss platform, the method further includes:

[0012] After the heavy block moves, determine the distance the heavy block moves and the waterline parameters of the truss platform after it tilts.

[0013] By applying the principle of ship restoring moment, the formula for the initial center of gravity is derived from the moving distance, the parameters of the waterline after tilting, the empty ship's displacement, and the weight of the heavy object.

[0014] The process of processing the coordinates of the buoyancy center, the empty ship's displacement, the weight of the heavy object, and the initial waterline parameters to obtain the empty ship's center of gravity height includes:

[0015] Based on the initial center of gravity formula, the coordinates of the center of buoyancy, the displacement of the empty ship, the weight of the heavy block, and the initial waterline parameters are processed to obtain the height of the empty ship's center of gravity.

[0016] Optionally, the initial center of gravity formula is derived by using the ship's restoring moment principle to calculate the moving distance, the tilted waterline parameters, the empty ship's displacement, and the weight of the heavy object, including:

[0017] Obtain the empty ship's displacement and the weight of the heavy block;

[0018] By processing the moving distance, the empty ship displacement, and the weight using the ship's restoring moment principle, the restoring arm of the truss platform after the heavy block is moved is determined.

[0019] Extract the base point of the truss platform entering the water and the center of gravity height of the empty ship with the weight block in the initial waterline parameters.

[0020] Based on the restoring lever arm, the tilted waterline parameters and the initial waterline parameters are derived to obtain the initial center of gravity formula. The tilted waterline parameters include the tilted center of buoyancy height of the truss platform.

[0021] Optionally, the formula for the restoring arm is:

[0022] GZ = M × L / (△ + M);

[0023] Wherein, GZ is the restoring arm of the truss platform after the heavy block moves, G is the height of the center of gravity of the empty ship when the heavy block is added, M is the weight of the heavy block, L is the moving distance of the heavy block, and Δ is the empty ship displacement.

[0024] Optionally, the initial centroid formula is:

[0025] KG=KB1×sin(θ+θ1) / sin(θ)-M×L / (Δ+M) / sin(θ);

[0026] Wherein, KG is the height of the center of gravity of the empty ship with the heavy block added, K is the base point of the truss platform entering the water, G is the height of the center of gravity of the empty ship with the heavy block added, B1 is the height of the center of buoyancy of the truss platform after tilting, θ is the tilt angle of the truss platform, θ1 is the angle between the height of the center of buoyancy after tilting and the height of the center of gravity of the empty ship with the heavy block added, M×L is the torque of the heavy block moving, M is the weight of the heavy block, and L is the distance the heavy block moves.

[0027] Optionally, the step of processing the coordinates of the center of buoyancy, the empty ship's displacement, the weight of the heavy object, and the initial waterline parameters based on the initial center of gravity formula to obtain the empty ship's center of gravity height includes:

[0028] Based on the initial center of gravity formula, the initial center of gravity height is determined according to the buoyancy center coordinates, the empty ship displacement, the weight, and the base point.

[0029] The initial center of gravity height and the weight are processed using the empty ship center of gravity formula to obtain the empty ship's center of gravity height.

[0030] Optionally, the formula for the center of gravity of the empty ship is:

[0031]

[0032] Among them, KG △ Let K be the height of the center of gravity of the empty ship, K be the base point of the truss platform entering the water, Δ be the displacement of the empty ship, M be the weight of the heavy block, and G be the height of the center of gravity of the empty ship with the heavy block added. M The height of the center of gravity of the heavy block.

[0033] Furthermore, to achieve the above objectives, the present invention also proposes a device for determining the center of gravity height of an empty ship, the device comprising:

[0034] The parameter acquisition module is used to determine the initial waterline parameters of the truss platform where the empty ship is located, and the truss platform includes a weight block.

[0035] The tilt angle acquisition module is used to move the weight block on the truss platform to obtain the tilt angle of the truss platform.

[0036] The buoyancy center coordinate module is used to determine the buoyancy center coordinate value of the empty ship at the heel angle by means of the hydrostatic curve. The hydrostatic curve represents the lateral and vertical coordinates of the buoyancy center of the truss platform at different heel angles.

[0037] The center of gravity height determination module is used to process the data of the buoyancy center coordinate value, the empty ship displacement, the weight of the heavy block, and the initial waterline parameters to obtain the center of gravity height of the empty ship.

[0038] Furthermore, to achieve the above objectives, the present invention also proposes an empty ship center of gravity height determination device, the device comprising: a memory, a processor, and an empty ship center of gravity height determination program stored in the memory and executable on the processor, the empty ship center of gravity height determination program being configured to implement the steps of the empty ship center of gravity height determination method as described above.

[0039] In addition, to achieve the above objectives, the present invention also proposes a storage medium storing a program for determining the center of gravity height of an empty ship, wherein when the program is executed by a processor, it implements the steps of the method for determining the center of gravity height of an empty ship as described above.

[0040] This invention first determines the initial waterline parameters of a truss-type platform on which the empty vessel is located, the truss-type platform including a weight block; then, the weight block is moved on the truss-type platform to obtain the heel angle of the truss-type platform; next, the coordinates of the center of buoyancy of the empty vessel at the heel angle are determined by hydrostatic curves, the hydrostatic curves representing the lateral and vertical coordinates of the center of buoyancy of the truss-type platform at different heel angles; finally, the coordinates of the center of buoyancy, the displacement of the empty vessel, the weight of the weight block, and the initial waterline parameters are processed to obtain the center of gravity height of the empty vessel. Because this invention obtains the heel angle by moving the weight block on the truss-type platform and determines the coordinates of the center of buoyancy of the empty vessel, and can process the data based on the coordinates of the center of buoyancy to determine the center of gravity height of the empty vessel, it effectively avoids the experimental errors caused by asymmetrical inlet and outlet volumes in traditional tilting tests. It is applicable to any truss-type platform and solves the problem of small-angle tilting and the need for the inlet and outlet volumes of the hull to be consistent after tilting. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of the device for determining the center of gravity height of an empty ship in the hardware operating environment involved in the embodiments of the present invention;

[0042] Figure 2 This is a flowchart illustrating the first embodiment of the method for determining the center of gravity height of an empty ship according to the present invention.

[0043] Figure 3 This is a schematic diagram illustrating the changes in water volume when a vessel is tilted at a small angle during entry and exit from the water in the first embodiment of the method for determining the center of gravity height of an empty vessel according to the present invention.

[0044] Figure 4 This is a schematic diagram illustrating the changes in water volume when a vessel enters or leaves the water at a large angle during the first embodiment of the method for determining the center of gravity height of an empty vessel according to the present invention.

[0045] Figure 5 This is a schematic diagram illustrating the changes in the water volume when the truss platform tilts during entry and exit from the water in the second embodiment of the method for determining the center of gravity height of an empty ship according to the present invention.

[0046] Figure 6 This is a flowchart illustrating the second embodiment of the method for determining the center of gravity height of an empty ship according to the present invention.

[0047] Figure 7 This is a schematic diagram illustrating the derivation of the center of gravity height in the second embodiment of the method for determining the center of gravity height of an empty ship according to the present invention.

[0048] Figure 8 This is a graph showing the change between the coordinates of the center of gravity and the tilt angle in the second embodiment of the method for determining the center of gravity of an empty ship according to the present invention.

[0049] Figure 9 This is a structural block diagram of the first embodiment of the device for determining the center of gravity height of an empty ship according to the present invention.

[0050] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0051] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0052] Reference Figure 1 , Figure 1 This is a schematic diagram of the device for determining the center of gravity height of an empty ship in the hardware operating environment involved in the embodiments of the present invention.

[0053] like Figure 1As shown, the device for determining the center of gravity of an empty ship may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to establish communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be high-speed random access memory (RAM) or stable non-volatile memory (NVM), such as a disk drive. The memory 1005 may also optionally be a storage device independent of the aforementioned processor 1001.

[0054] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the device for determining the center of gravity of an empty ship, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0055] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a network communication module, a user interface module, and a program for determining the center of gravity of an empty ship.

[0056] exist Figure 1 In the empty ship center of gravity height determination device shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the empty ship center of gravity height determination device of the present invention can be set in the empty ship center of gravity height determination device, the empty ship center of gravity height determination device calls the empty ship center of gravity height determination program stored in the memory 1005 through the processor 1001, and executes the empty ship center of gravity height determination method provided in the embodiment of the present invention.

[0057] This invention provides a method for determining the center of gravity height of an empty ship, referring to... Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of the method for determining the center of gravity height of an empty ship according to the present invention.

[0058] It should be noted that after a ship is completed, an inclining test is generally required to measure its empty weight and center of gravity. This differs from conventional inclining test methods, which typically calculate the center of gravity (kg) using the initial metacentric height (GM). However, this method has a prerequisite: the ship must be inclining at a small angle (<4°) and the submerged and above-water volumes of the hull must be consistent after the inclining. (Reference) Figure 3 , Figure 3 This is a schematic diagram illustrating the changes in water level during a small-angle tilt in the first embodiment of the method for determining the center of gravity height of an empty ship according to the present invention. Figure 3 As shown, W0L0 is the initial waterline, and W1L1 is the waterline after tilting. The above method can only be used when the volume of the hull entering and leaving the water is the same after tilting.

[0059] For platforms where the hull's submerged volume and its submerged volume are inconsistent (see reference) Figure 4 , Figure 4 (The diagram showing the change in water volume when tilted at a large angle in the first embodiment of the method for determining the center of gravity of an empty ship according to the present invention) makes it difficult to accurately determine the center of gravity using the GM value.

[0060] Furthermore, refer to Figure 5 , Figure 5 This is a schematic diagram illustrating the changes in the water level when the truss platform tilts during entry and exit from the water, as shown in the second embodiment of the method for determining the center of gravity height of an empty ship according to the present invention. Figure 5 As shown, the main structure of modern truss platforms often has many struts, and at a certain tilt angle, the volume of the hull submerged in water will differ from its volume above water. If the center of gravity height is still calculated using the GM (Gross Motion) during tilting tests, this will inevitably introduce some error. Therefore, to solve the above problem, this invention proposes a method for determining the center of gravity height of an empty vessel, effectively avoiding the experimental errors caused by asymmetrical submerged and above-water volumes during tilting tests.

[0061] In this embodiment, as Figure 2 As shown, the method for determining the center of gravity height of an empty ship includes the following steps:

[0062] Step S10: Determine the initial waterline parameters of the truss platform where the empty ship is located, the truss platform including the weight block.

[0063] It should be noted that the execution subject of the method in this embodiment can be an electronic device with data processing, coordinate processing, and center of gravity height calculation functions, such as a personal computer, or other electronic devices capable of performing the same or similar functions, such as the aforementioned empty ship center of gravity height determination device. This embodiment does not limit this. Here, the aforementioned empty ship center of gravity height determination device (hereinafter referred to as the determination device) will be used to specifically describe this embodiment and the following embodiments.

[0064] Understandably, a truss platform is a spatial structure platform composed of various components, typically connected by straight members and nodes. The truss platform structure is characterized by high strength, lightweight, modularity, and adaptability, making it suitable for supporting ship launches. During ship construction, the hull is generally assembled and equipped on land for ease of construction and testing. After assembly, a truss platform is needed to stably support the hull for transporting it into the water and launching it, ensuring balance and a smooth entry into the water. The truss platform provides a stable support structure and an appropriate tilt angle to ensure a smooth launch and prevent accidents.

[0065] It should be understood that the initial waterline parameters are the parameters related to the position and horizontal plane of the truss platform and the empty ship at the water surface when they enter the water, such as the initial waterline, center of gravity height, initial buoyancy height, and water entry base point of the truss platform after entering the water.

[0066] Understandably, the weight block is a movable weight set on the truss platform. By moving the weight block, the truss platform can be tilted on the water surface, thereby determining the center of gravity of the empty ship.

[0067] Step S20: Move the weight block on the truss platform to obtain the tilt angle of the truss platform.

[0068] It should be noted that the lateral tilt angle is the angle of inclination of the truss platform relative to the horizontal plane when the weight block is moved on the truss platform.

[0069] In practical implementation, the equipment first determines the initial waterline parameters of the truss platform on which the empty ship is located, such as the initial waterline, center of gravity height, initial center of buoyancy height, and water entry base point after the truss platform enters the water. Then, when the weight block is moved on the truss platform, the lateral tilt angle of the truss platform relative to the horizontal plane is obtained, and the center of gravity height of the empty ship is calculated from the tilt angle.

[0070] Step S30: Determine the coordinates of the center of buoyancy of the empty vessel at the heel angle using the hydrostatic curve. The hydrostatic curve represents the lateral and vertical coordinates of the center of buoyancy of the truss platform at different heel angles.

[0071] It should be noted that the center of buoyancy coordinates refer to the coordinates of the center of buoyancy of the truss platform relative to the net draft after it has entered the water. The center of buoyancy is the intersection of the line of action of buoyancy and the initial line of action of buoyancy when the truss platform is tilting. The center of buoyancy coordinates are a vertical distance, generally represented by the letters GM. A higher center of buoyancy coordinate means a stronger ability to regain balance when the ship tilts, resulting in better stability. Conversely, a lower center of buoyancy coordinate leads to a larger tilting angle and poorer stability.

[0072] Understandably, a hydrostatic curve describes the relationship between buoyancy, gravity, and related parameters of a truss platform in equilibrium in still water. The hydrostatic curve can use the vertical coordinate of the truss platform (usually the waterline) as the independent variable, while buoyancy, gravity, and other related parameters (such as draft, displacement, and net draft) are the dependent variables. By varying the displacement of the truss platform, a series of hydrostatic curves can be plotted for different drafts.

[0073] Step S40: Perform data processing on the coordinates of the buoyancy center, the displacement of the empty ship, the weight of the heavy block, and the initial waterline parameters to obtain the center of gravity height of the empty ship.

[0074] It should be noted that lightship displacement is the total weight of a ship without any cargo, fuel, ammunition, personnel, or other additional loads; it can also be understood as unloaded displacement. Understanding a ship's lightship displacement allows for better control of the ship's load when carrying cargo, fuel, and personnel, ensuring safety.

[0075] In practical implementation, a hydrostatic curve showing the relationship between buoyancy and related tilt angles of the truss platform in equilibrium in still water can be obtained. Using this curve, the coordinates of the center of buoyancy of the empty vessel at the specified tilt angle can be determined. Finally, data processing is performed on the coordinates of the center of buoyancy, the empty vessel's displacement, the weight of the heavy object, and the initial waterline parameters to directly calculate the height of the empty vessel's center of gravity. This eliminates the need for the hull's water ingress and egress volumes to be consistent and for small-angle tilting requirements.

[0076] In this embodiment, the device first determines the initial waterline parameters of the truss platform on which the empty ship is located, such as the initial waterline, center of gravity height, initial center of buoyancy height, and entry base point after the truss platform enters the water. Then, as the weight block moves on the truss platform, the lateral tilt angle of the truss platform relative to the horizontal plane is obtained, and the center of gravity height of the empty ship is calculated from the tilt angle. Next, the hydrostatic curve showing the relationship between the buoyancy of the truss platform in equilibrium in still water and the relevant tilt angle is obtained. The coordinate value of the center of buoyancy of the empty ship at the tilt angle is determined from the hydrostatic curve. Finally, the coordinate value of the center of buoyancy, the empty ship's displacement, the weight of the weight block, and the initial waterline parameters are processed to directly calculate the center of gravity height of the empty ship, thus eliminating the need for the hull's entry and exit volumes to be consistent after tilting and the requirement for a small tilt angle. Since this embodiment obtains the tilt angle by moving a weight block on a truss platform and determines the coordinate value of the buoyancy center of the empty ship, the data can be processed based on the coordinate value of the buoyancy center to determine the height of the center of gravity of the empty ship. This can effectively avoid the test error caused by the asymmetrical inlet and outlet volumes during traditional tilting tests. It is applicable to any truss platform and solves the problem of small-angle tilting and the need for the inlet and outlet volumes of the ship to be consistent after tilting.

[0077] refer to Figure 6 , Figure 6 This is a flowchart illustrating the second embodiment of the method for determining the center of gravity height of an empty ship according to the present invention.

[0078] Based on the first embodiment described above, in this embodiment, after step S20, the method further includes:

[0079] Step S201: After the heavy block moves, determine the moving distance of the heavy block and the waterline parameters after the truss platform tilts.

[0080] It should be noted that the parameters of the waterline after tilting are the parameters related to the position and horizontal plane of the truss platform and the empty ship at the water surface after tilting under the action of the weight block, such as the initial waterline after tilting, the height of the center of gravity after tilting, and the height of the center of buoyancy after tilting.

[0081] Step S202: Using the principle of ship restoring torque, the initial center of gravity formula is obtained by deriving the moving distance, the waterline parameters after tilting, the empty ship's displacement, and the weight of the heavy block.

[0082] It should be noted that the principle of the ship's restoring moment is a fundamental principle describing ship stability. When a ship tilts, buoyancy generates a restoring moment, which causes the ship's tilt angle to tend towards equilibrium. The restoring moment generated when a ship tilts is related to the tilt angle and the coordinates of the center of buoyancy. Generally, when the tilt angle is small, the restoring moment is directly proportional to the tilt angle; when the tilt angle is large, the restoring moment is directly proportional to the sine of the tilt angle. The function of the restoring moment is to cause the ship's tilt angle to tend towards equilibrium, thereby maintaining the ship's stability. Based on the principle of the ship's restoring moment, the ship's center of buoyancy coordinates can be adjusted to adjust the ship's stability.

[0083] In practical implementation, for ease of understanding, please refer to... Figure 7 , Figure 7 This is a schematic diagram illustrating the derivation of the center of gravity height in the second embodiment of the method for determining the center of gravity height of an empty ship according to the present invention. Figure 7 As shown, after the empty ship enters the water, W0L0 is the initial waterline after entry, point G is the center of gravity height after entry, B0 is the initial buoyancy height after entry, and K is the base point after entry.

[0084] At this point, the height of the ship's center of gravity, KG, can be obtained from KG = KB0 + B0G. Since KB0 is known, only B0G needs to be calculated.

[0085] Further, in this embodiment, step S202 includes: obtaining the empty ship's displacement and the weight of the heavy block; processing the moving distance, the empty ship's displacement, and the weight using the ship's restoring moment principle to determine the restoring arm of the truss platform after the heavy block moves; extracting the base point of the truss platform entering the water and the center of gravity height point of the empty ship plus the heavy block from the initial waterline parameters; and, based on the restoring arm, deriving the initial center of gravity formula from the tilted waterline parameters and the initial waterline parameters, wherein the tilted waterline parameters include the tilted center of buoyancy height point of the truss platform.

[0086] Furthermore, the formula for the restoring lever arm in this embodiment is: GZ=M×L / (△+M);

[0087] Wherein, GZ is the restoring arm of the truss platform after the heavy block moves, G is the center of gravity height of the empty ship when the heavy block is added, M is the weight of the heavy block, L is the moving distance of the heavy block, and Δ is the empty ship displacement.

[0088] In actual implementation, such as Figure 7As shown, when the weight block M (center of gravity height KGM) moves a distance L and generates a torque M×L, relevant information about the new equilibrium position point can be obtained. W1L1 is the waterline after tilting; B1 is the height of the buoyancy center after tilting; VL1 is the line passing through the buoyancy center B1 and perpendicular to the waterline W1L1.

[0089] As can be seen from the ship's restoring torque, the torque generated by moving the heavy block = new displacement (Δ + M) × restoring arm (GZ), where Δ is the empty ship displacement.

[0090] Then we can obtain GZ = M × L / (△ + M).

[0091] At this time, as Figure 7 As shown, draw a line parallel to GZ through point B0, intersecting VL1 at point R; draw a line VL2 parallel to VL1 through point G, then we can obtain ER=GZ=M×L / (△+M).

[0092] In △GB0E, B0G=B0E / sinθ, that is, B0E=B0G×sinθ.

[0093] Next, as Figure 7 As shown, draw a line through point K parallel to the reverse extension of the perpendicular BOR, intersecting at point H; in △KB0H, HB0=KB0×sinθ, then the following formula can be obtained:

[0094] HR=HB0+B0E+ER=KB0×sinθ+B0G×sinθ+M×L / △=KG×sinθ+M×L / (△+M);

[0095] Then as Figure 7 As shown, draw a perpendicular line from point B1 to point KH, intersecting at point H1, and then we can obtain HR = H1B1.

[0096] In △KB1H1, H1B1=KB1×sin(θ+θ1), where θ1=arctan(y / z), (y and z are the horizontal coordinates and vertical coordinates of the center of buoyancy B1 after tilting).

[0097] Furthermore, the initial centroid formula in this embodiment is: KG=KB1×sin(θ+θ1) / sin(θ)-M×L / (△+M) / sin(θ);

[0098] Wherein, KG is the height of the center of gravity of the empty ship with the heavy block added, K is the base point of the truss platform entering the water, G is the height of the center of gravity of the empty ship with the heavy block added, B1 is the height of the center of buoyancy of the truss platform after tilting, θ is the tilt angle of the truss platform, θ1 is the angle between the height of the center of buoyancy after tilting and the height of the center of gravity of the empty ship with the heavy block added, M×L is the torque of the heavy block moving, M is the weight of the heavy block, and L is the distance the heavy block moves.

[0099] In actual implementation, such as Figure 7 As shown, from the above formula HR=H1B1, we can obtain:

[0100] KG×sinθ+M×L / (Δ+M)=KB1×sin(θ+θ1);

[0101] By transforming the formula, we can obtain the initial centroid formula:

[0102] KG=KB1×sin(θ+θ1) / sin(θ)-M×L / (Δ+M) / sin(θ).

[0103] After obtaining the initial centroid formula, the parameters M, L, Δ, and θ can all be obtained from experiments, and θ1 can be obtained by the formula θ1=arctan(y / z).

[0104] The acquisition of B1(y, z) can be found by referring to... Figure 8 , Figure 8 This is a graph showing the relationship between the coordinates of the center of gravity and the tilt angle in the second embodiment of the method for determining the center of gravity of an empty ship according to the present invention. Figure 8 As shown, the upper figure shows the curve of the lateral coordinate y of the center of buoyancy as a function of the inclination angle θ at a displacement of (Δ+M), and the lower figure shows the curve of the vertical coordinate z of the center of buoyancy as a function of the inclination angle θ at a displacement of (Δ+M). During the inclination test, the hull displacement is constant, and the curve can be calculated from... Figure 8 Read out the y (i.e., TCB) and z (i.e., VCB) of the center of buoyancy B under different tilt angles θ.

[0105] Based on the parameters obtained above, we can calculate...

[0106] Therefore, step S40 includes: step S41: based on the initial center of gravity formula, data processing is performed on the buoyancy center coordinate value, the empty ship displacement, the weight of the heavy block, and the initial waterline parameters to obtain the center of gravity height of the empty ship.

[0107] Further, in this embodiment, step S41 includes: determining the initial center of gravity height based on the initial center of gravity formula, according to the buoyancy center coordinate value, the empty ship displacement, the weight, and the base point; and processing the initial center of gravity height and the weight using the empty ship center of gravity formula to obtain the empty ship's center of gravity height.

[0108] In actual implementation, the effect of the weight M of the excess heavy blocks on the center of gravity of the empty ship must be deducted.

[0109] Furthermore, in this embodiment, the formula for the center of gravity of the empty ship is:

[0110]

[0111] Among them, KG △ Let K be the height of the center of gravity of the empty ship, K be the base point of the truss platform entering the water, Δ be the displacement of the empty ship, M be the weight of the heavy block, and G be the height of the center of gravity of the empty ship with the heavy block added. M The height of the center of gravity of the heavy block.

[0112] In practical implementation, the above formula can be used to obtain:

[0113] (△+M)×KG=△×KG△+M×KGM;

[0114] Therefore, the center of gravity of the empty ship can be derived as:

[0115]

[0116] The method for determining the center of gravity height of an empty vessel proposed in this embodiment is a novel calculation method for tilting tests. First, the initial draft of the platform (including the weight block) is read. Then, different heel angles θ are obtained by moving the weight block multiple times. Next, the coordinate values ​​of the center of buoyancy B (including lateral and vertical coordinates) at different heel angles θ are read on the hydrostatic curve. Then, multiple sets of center of gravity height (KG) values ​​are calculated using the formula described above. Finally, the influence of the excess weight M on the empty vessel's center of gravity is deducted to obtain the required center of gravity height. This method effectively avoids the experimental errors caused by asymmetrical inlet and outlet volumes in traditional tilting tests. It is applicable to any truss platform and solves the problems of small-angle tilting and the need for the inlet and outlet volumes of the hull to be consistent after tilting.

[0117] Furthermore, this embodiment of the invention also proposes a storage medium storing a program for determining the center of gravity height of an empty ship. When the program is executed by a processor, it implements the steps of the method for determining the center of gravity height of an empty ship as described above.

[0118] Reference Figure 9 , Figure 9This is a structural block diagram of the first embodiment of the device for determining the center of gravity height of an empty ship according to the present invention.

[0119] like Figure 9 As shown, the device for determining the center of gravity height of an empty ship according to an embodiment of the present invention includes:

[0120] The parameter acquisition module 901 is used to determine the initial waterline parameters of the truss platform where the empty ship is located, and the truss platform includes a weight block.

[0121] The tilt angle acquisition module 902 is used to move the weight block on the truss platform to obtain the tilt angle of the truss platform.

[0122] The buoyancy center coordinate module 903 is used to determine the buoyancy center coordinate value of the empty ship at the heel angle through the hydrostatic curve. The hydrostatic curve represents the lateral and vertical coordinates of the buoyancy center of the truss platform at different heel angles.

[0123] The center of gravity height determination module 904 is used to process the data of the buoyancy center coordinate value, the empty ship displacement, the weight of the heavy block and the initial waterline parameters to obtain the center of gravity height of the empty ship.

[0124] In this embodiment, the device first determines the initial waterline parameters of the truss platform on which the empty ship is located, such as the initial waterline, center of gravity height, initial center of buoyancy height, and entry base point after the truss platform enters the water. Then, as the weight block moves on the truss platform, the lateral tilt angle of the truss platform relative to the horizontal plane is obtained, and the center of gravity height of the empty ship is calculated from the tilt angle. Next, the hydrostatic curve showing the relationship between the buoyancy of the truss platform in equilibrium in still water and the relevant tilt angle is obtained. The coordinate value of the center of buoyancy of the empty ship at the tilt angle is determined from the hydrostatic curve. Finally, the coordinate value of the center of buoyancy, the empty ship's displacement, the weight of the weight block, and the initial waterline parameters are processed to directly calculate the center of gravity height of the empty ship, thus eliminating the need for the hull's entry and exit volumes to be consistent after tilting and the requirement for a small tilt angle. Since this embodiment obtains the tilt angle by moving a weight block on a truss platform and determines the coordinate value of the buoyancy center of the empty ship, the data can be processed based on the coordinate value of the buoyancy center to determine the height of the center of gravity of the empty ship. This can effectively avoid the test error caused by the asymmetrical inlet and outlet volumes during traditional tilting tests. It is applicable to any truss platform and solves the problem of small-angle tilting and the need for the inlet and outlet volumes of the ship to be consistent after tilting.

[0125] Based on the first embodiment of the empty ship center of gravity height determination device of the present invention, a second embodiment of the empty ship center of gravity height determination device of the present invention is proposed.

[0126] In this embodiment, the parameter acquisition module 901 is further configured to determine the moving distance of the heavy block and the waterline parameters after the truss platform tilts after the heavy block moves; and to obtain an initial center of gravity formula by extrapolating the moving distance, the tilted waterline parameters, the empty ship's displacement, and the weight of the heavy block using the ship's restoring moment principle; the center of gravity height determination module 904 is further configured to process the buoyancy coordinates, the empty ship's displacement, the weight of the heavy block, and the initial waterline parameters based on the initial center of gravity formula to obtain the center of gravity height of the empty ship.

[0127] Furthermore, the parameter acquisition module 901 is also used to acquire the empty ship's displacement and the weight of the heavy block; by processing the moving distance, the empty ship's displacement, and the weight using the ship's restoring moment principle, to determine the restoring arm of the truss platform after the heavy block moves; extracting the base point of the truss platform entering the water and the center of gravity height point of the empty ship plus the heavy block from the initial waterline parameters; based on the restoring arm, deriving the initial center of gravity formula from the tilted waterline parameters and the initial waterline parameters, wherein the tilted waterline parameters include the tilted center of buoyancy height point of the truss platform.

[0128] Furthermore, the formula for the restoring lever arm is:

[0129] GZ = M × L / (△ + M);

[0130] Wherein, GZ is the restoring arm of the truss platform after the heavy block moves, G is the center of gravity height of the empty ship when the heavy block is added, M is the weight of the heavy block, L is the moving distance of the heavy block, and Δ is the empty ship displacement.

[0131] Furthermore, the initial centroid formula is:

[0132] KG=KB1×sin(θ+θ1) / sin(θ)-M×L / (Δ+M) / sin(θ);

[0133] Wherein, KG is the height of the center of gravity of the empty ship with the heavy block added, K is the base point of the truss platform entering the water, G is the height of the center of gravity of the empty ship with the heavy block added, B1 is the height of the center of buoyancy of the truss platform after tilting, θ is the tilt angle of the truss platform, θ1 is the angle between the height of the center of buoyancy after tilting and the height of the center of gravity of the empty ship with the heavy block added, M×L is the torque of the heavy block moving, M is the weight of the heavy block, and L is the distance the heavy block moves.

[0134] Furthermore, the center of gravity height determination module 904 is also used to determine the initial center of gravity height value based on the initial center of gravity formula, according to the buoyancy center coordinate value, the empty ship displacement, the weight, and the base point; and to process the initial center of gravity height value and the weight through the empty ship center of gravity formula to obtain the center of gravity height of the empty ship.

[0135] Furthermore, the formula for the center of gravity of the empty ship is:

[0136]

[0137] Among them, KG △ Let K be the height of the center of gravity of the empty ship, K be the base point of the truss platform entering the water, Δ be the displacement of the empty ship, M be the weight of the heavy block, and G be the height of the center of gravity of the empty ship with the heavy block added. M The height of the center of gravity of the heavy block.

[0138] Other embodiments or specific implementations of the device for determining the center of gravity height of an empty ship according to the present invention can be referred to the above-described method embodiments, and will not be repeated here.

[0139] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0140] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0141] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory / random access memory, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0142] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for determining the center of gravity height of an empty ship, characterized in that, The method for determining the height of the empty ship's center of gravity includes: Determine the initial waterline parameters of the truss platform on which the empty ship is located, the truss platform including the weight block; The weight block is moved on the truss platform to obtain the tilt angle of the truss platform; The coordinates of the center of buoyancy of the empty vessel at the specified heel angle are determined by the hydrostatic curve. The hydrostatic curve represents the lateral and vertical coordinates of the center of buoyancy of the truss platform at different heel angles. The center of gravity height of the empty ship is obtained by processing the coordinates of the buoyancy center, the displacement of the empty ship, the weight of the heavy block, and the initial waterline parameters. After moving the weight block on the truss platform to obtain the tilt angle of the truss platform, the method further includes: After the heavy block moves, determine the distance the heavy block moves and the waterline parameters of the truss platform after it tilts. By applying the principle of ship restoring moment, the formula for the initial center of gravity is derived from the moving distance, the parameters of the waterline after tilting, the empty ship's displacement, and the weight of the heavy object. The process of processing the coordinates of the buoyancy center, the empty ship's displacement, the weight of the heavy object, and the initial waterline parameters to obtain the empty ship's center of gravity height includes: Based on the initial center of gravity formula, the coordinates of the center of buoyancy, the empty ship's displacement, the weight of the heavy block, and the initial waterline parameters are processed to obtain the height of the empty ship's center of gravity. The initial center of gravity formula is derived by using the ship's restoring moment principle, based on the moving distance, the waterline parameters after tilting, the empty ship's displacement, and the weight of the heavy object. This includes: Obtain the empty ship's displacement and the weight of the heavy block; By processing the moving distance, the empty ship displacement, and the weight using the ship's restoring moment principle, the restoring arm of the truss platform after the heavy block is moved is determined. Extract the base point of the truss platform entering the water and the center of gravity height of the empty ship with the weight block in the initial waterline parameters. Based on the restoring lever arm, the tilted waterline parameters and the initial waterline parameters are derived to obtain the initial center of gravity formula. The tilted waterline parameters include the tilted center of buoyancy height of the truss platform. The formula for the initial centroid is: KG=KB1×sin(θ+θ1) / sin(θ)-M×L / (△+ M) / sin(θ); Wherein, KG is the height of the center of gravity of the empty ship with the heavy block added, K is the base point of the truss platform entering the water, G is the height of the center of gravity of the empty ship with the heavy block added, B1 is the height of the center of buoyancy of the truss platform after tilting, θ is the heel angle of the truss platform, θ1 is the angle between the height of the center of buoyancy after tilting and the height of the center of gravity of the empty ship with the heavy block added, M×L is the torque of the heavy block moving, M is the weight of the heavy block, L is the distance the heavy block moves, and Δ is the displacement of the empty ship.

2. The method for determining the center of gravity height of an empty ship as described in claim 1, characterized in that, The formula for the restoring lever arm is: GZ = M × L / (△ + M); Wherein, GZ is the restoring arm of the truss platform after the heavy block moves, G is the height of the center of gravity of the empty ship when the heavy block is added, M is the weight of the heavy block, L is the moving distance of the heavy block, and Δ is the empty ship displacement.

3. The method for determining the center of gravity height of an empty ship as described in claim 1, characterized in that, The process of processing the coordinates of the center of buoyancy, the empty ship's displacement, the weight of the heavy object, and the initial waterline parameters based on the initial center of gravity formula to obtain the height of the empty ship's center of gravity includes: Based on the initial center of gravity formula, the initial center of gravity height is determined according to the buoyancy coordinates, the empty ship displacement, the weight, and the base point. The initial center of gravity height and the weight are processed using the empty ship center of gravity formula to obtain the empty ship's center of gravity height.

4. The method for determining the center of gravity height of an empty ship as described in claim 3, characterized in that, The formula for the center of gravity of an empty ship is: ； in, Let K be the height of the center of gravity of the empty ship, K be the base point of the truss platform entering the water, Δ be the displacement of the empty ship, M be the weight of the heavy block, and G be the height of the center of gravity of the empty ship with the heavy block added. The height of the center of gravity of the heavy block.

5. A device for determining the center of gravity height of an empty ship, characterized in that, The empty ship center of gravity height determination device performs the empty ship center of gravity height determination method as described in claim 1, the device comprising: The parameter acquisition module is used to determine the initial waterline parameters of the truss platform where the empty ship is located, and the truss platform includes a weight block. The tilt angle acquisition module is used to move the weight block on the truss platform to obtain the tilt angle of the truss platform. The buoyancy center coordinate module is used to determine the buoyancy center coordinate value of the empty ship at the heel angle by means of the hydrostatic curve. The hydrostatic curve represents the lateral and vertical coordinates of the buoyancy center of the truss platform at different heel angles. The center of gravity height determination module is used to process the data of the buoyancy center coordinate value, the empty ship displacement, the weight of the heavy block, and the initial waterline parameters to obtain the center of gravity height of the empty ship.

6. A device for determining the center of gravity height of an empty ship, characterized in that, The device includes: a memory, a processor, and an empty ship center of gravity height determination program stored in the memory and executable on the processor, the empty ship center of gravity height determination program being configured to implement the steps of the empty ship center of gravity height determination method as described in any one of claims 1 to 4.

7. A storage medium, characterized in that, The storage medium stores a program for determining the center of gravity height of an empty ship, which, when executed by a processor, implements the steps of the method for determining the center of gravity height of an empty ship as described in any one of claims 1 to 4.

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