Ship floating docking block support reaction calculation method and terminal

Abstract

The invention discloses a ship floating docking block support reaction calculation method and a terminal, and the method comprises the steps: obtaining the total gravity and gravity center position of a ship, and selecting a block which is located at one side where the gravity center of the ship deviates and is closest to a ship side vertical line; the buoyancy of each equal-depth draft in the horizontal state of the ship is counted; based on the buoyancy and the total gravity of the ship, the sum of moments borne by the distance pier timber is calculated; respectively screening corresponding draft depths when the direction of the sum of the moments is vertically upward and when the direction of the sum of the moments is vertically downward; the ship buoyancy center position when the sum of the moments is vertically upward and the ship buoyancy center position when the sum of the moments is vertically downward are extracted according to the draught depth, and the corresponding ship buoyancy center position when the sum of the moments is equal to zero is obtained through a linear interpolation method; based on the corresponding ship buoyancy center position when the moment sum is equal to zero, the buoyancy when the ship floats is obtained through statistics, and based on the ship gravity, the maximum bearing reaction borne by the pier timber is obtained through calculation.

Description

Technical Field

[0001] The invention relates to the technical field of ships, and in particular to a method and a terminal for calculating the reaction force of a ship floating dock support. Background Art

[0002] In the process of ship construction and maintenance, the floating operation of the ship is a crucial link, especially when the ship floats from the dry dock or floating dock, it is necessary to accurately calculate the forces on the hull at different positions to ensure safe operation and prevent deformation or damage to the hull. In this process, the pier is an important equipment used to support the ship. When the ship floats, the support reaction force on the pier must be accurately calculated to ensure a smooth floating process. Traditional ship floating mechanics analysis methods usually rely on complex modeling and finite element analysis. Although these methods are accurate, the calculation process is complex and time-consuming, and requires a lot of preliminary preparation work, such as establishing an accurate hull model and configuring appropriate boundary conditions.

[0003] In addition, during the floating process, the position of the ship's center of gravity and buoyancy changes with the draft depth, which further increases the complexity of the calculation. Due to the different interactions between the ship's gravity and buoyancy during the floating process, the piers supporting the ship will be subjected to different moments. Therefore, under different draft conditions, the support reaction forces on the piers will also be different.

[0004] Most of the existing technical solutions rely on numerical simulation methods. For example, a Chinese invention patent with publication number CN105279322A discloses a method for calculating the reaction force of the stern dock support of an undocking ship, which includes the following steps: (1) According to the three stages of before the bow floats up, the bow floats up, and the stern floats up, the force analysis of the undocking ship is carried out, and a mathematical model is established to quantitatively analyze the basic law of the change of the stern dock support reaction force with the external draft; (2) The influencing factors affecting the stern dock support reaction force are determined, and the influence degree of each influencing factor is analyzed and obtained: stern inclination angle > high longitudinal stability > displacement > buoyancy center position; (3) The maximum value of the stern dock support reaction force is calculated, and the correctness of the calculation result is verified; (4) A fitting curve is drawn to obtain the change of the stern dock support reaction force during the whole process of the ship undocking and floating. The calculation method can not only calculate the maximum value of the stern dock pier support reaction force, but also calculate the stern dock pier support reaction force during the entire process of dock floating, and make a fitting curve of the stern dock pier support reaction force changing with draft as a technical basis for safe production. However, this method has the problem that the solution process is too rough and not intuitive.

[0005] Another Chinese invention patent with publication number CN 111563286B discloses a method and device for force analysis of a ship dock, which includes: three-dimensional modeling of the ship dock; discretization of the three-dimensional model of the ship dock to generate each unit of the three-dimensional model; establishing the stiffness equation of the unit according to the strain of the dock in three-dimensional space; solving the stiffness equation, and calculating the force condition of the ship dock according to the solution of the stiffness equation. The method and device for force analysis of a ship dock provided by the embodiment of the invention improve the accuracy of the force analysis results of the ship dock. However, the method uses the direction of finite element calculation to perform the force analysis of the dock, which has the problem of complex modeling and takes a long time, and the characteristic values ​​of some ships such as the center of buoyancy position / stability height cannot be well solved, so further improvement is needed.

[0006] There is also a Chinese invention patent with publication number CN106372345B, which uses the GROUND command of the GHS software to solve the support reaction of each dock pier; wherein, the flexibility of the rigid beam of the hull is added to the GROUND command of the GHS software, so that the dock pier support reaction calculated by the above command. However, on the one hand, the flexibility value defined by the rigid beam of the hull may not be accurate, and a too large value may cause the actual dock pier support reaction to be greater than the calculated value; on the other hand, the GHS software needs to be used for calculation, which requires expensive software usage fees and may be blocked by foreign software.

[0007] These methods not only require complex preliminary modeling, but are also difficult to apply in the actual operation of ship floating. Especially when the hull has a complex geometry and the center of gravity is offset, it is difficult for traditional methods to quickly and accurately calculate the support reaction force borne by the pier. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a method and a terminal for calculating the reaction force of a ship floating dock pier support, so as to make full use of existing resources to calculate the reaction force of the ship floating dock pier support.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0010] A method for calculating the reaction force of a ship floating dock pier, comprising the steps of:

[0011] S1. Obtain the total gravity and center of gravity of the ship, and select the pier located on one side of the center of gravity of the ship and closest to the vertical line of the ship;

[0012] S2. Calculate and count the buoyancy of the ship at various draft depths and the distance from the center of buoyancy to the vertical line of the ship when the ship is in a horizontal state;

[0013] S3, calculating the total moment borne by the pier based on the buoyancy and the total weight of the ship;

[0014] S4, respectively selecting the draft depths corresponding to when the direction of the sum of the moments is vertically upward and when the direction of the sum of the moments is vertically downward;

[0015] S5, extracting the buoyancy center position of the ship when the sum of the moments is vertically upward and the buoyancy center position of the ship when the sum of the moments is vertically downward according to the draft depth, and using a linear interpolation method to obtain the buoyancy center position of the ship when the sum of the moments is equal to zero;

[0016] S6. The buoyancy of the ship when it floats is calculated based on the corresponding buoyancy center position of the ship when the sum of the moments is equal to zero, and the maximum support reaction force borne by the pier is calculated based on the gravity of the ship.

[0017] In order to solve the above technical problems, another technical solution adopted by the present invention is:

[0018] A calculation terminal for the reaction force of a ship floating dock pier, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor completes the following steps when executing the computer program:

[0019] S1. Obtain the total gravity and center of gravity of the ship, and select the pier located on one side of the center of gravity of the ship and closest to the vertical line of the ship;

[0020] S2. Calculate and count the buoyancy of the ship at various draft depths and the distance from the center of buoyancy to the vertical line of the ship when the ship is in a horizontal state;

[0021] S3, calculating the total moment borne by the pier based on the buoyancy and the total weight of the ship;

[0022] S4, respectively selecting the draft depths corresponding to when the direction of the sum of the moments is vertically upward and when the direction of the sum of the moments is vertically downward;

[0023] S5, extracting the buoyancy center position of the ship when the sum of the moments is vertically upward and the buoyancy center position of the ship when the sum of the moments is vertically downward according to the draft depth, and using a linear interpolation method to obtain the buoyancy center position of the ship when the sum of the moments is equal to zero;

[0024] S6. The buoyancy of the ship when it floats is calculated based on the corresponding buoyancy center position of the ship when the sum of the moments is equal to zero, and the maximum support reaction force borne by the pier is calculated based on the gravity of the ship.

[0025] The beneficial effects of the present invention are as follows: a method and a terminal for calculating the supporting reaction force of a ship floating dock pier are provided, piers providing supporting reaction force when the bow / stern is floating are selected according to the center of gravity position of the ship, and the sum of the moments caused by buoyancy and gravity on the piers is calculated. When the direction of the sum of the moments is vertically downward, it means that the moment formed by buoyancy on the piers is still smaller than the moment formed by gravity on the piers, so no floating will occur at this time; when the direction of the sum of the moments is vertically upward, it means that the moment formed by buoyancy on the piers is greater than the moment formed by gravity on the piers, and in this case the ship is about to float; the draft depths and the corresponding center of buoyancy positions under the two states are counted, and the corresponding center of buoyancy position of the ship is calculated by linear interpolation method when the sum of the moments is equal to zero, at this time the supporting reaction force borne by the piers is the largest, and the corresponding supporting reaction force is calculated according to the buoyancy and the center of buoyancy position, and the force condition of the piers providing the maximum supporting reaction force is intuitively calculated without modeling analysis, simplifying the calculation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of a method for calculating the reaction force of a ship floating dock pier in an embodiment of the present invention;

[0027] Figure 2 It is a schematic diagram of calculating the reaction force of a ship floating dock pier support in an embodiment of the present invention;

[0028] Figure 3 It is a schematic diagram of a calculation terminal for the reaction force of a ship floating dock pier according to an embodiment of the present invention;

[0029] Description of labels:

[0030] 1. A terminal for calculating reaction force of a ship floating dock support; 2. A memory; 3. A processor. DETAILED DESCRIPTION

[0031] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0032] Please refer to Figure 1 A method for calculating the reaction force of a ship floating dock pier, comprising the steps of:

[0033] S1. Obtain the total gravity and center of gravity of the ship, and select the pier located on one side of the center of gravity of the ship and closest to the vertical line of the ship;

[0034] S2, calculating and statistically analyzing the buoyancy of each equal draft in the horizontal state of the ship and the distance from the center of buoyancy of the ship to the vertical line of the side; S3, calculating the total moment borne by the pier based on the buoyancy and the total weight of the ship;

[0035] S4, respectively selecting the draft depths corresponding to when the direction of the sum of the moments is vertically upward and when the direction of the sum of the moments is vertically downward;

[0036] S5, extracting the buoyancy center position of the ship when the sum of the moments is vertically upward and the buoyancy center position of the ship when the sum of the moments is vertically downward according to the draft depth, and using a linear interpolation method to obtain the buoyancy center position of the ship when the sum of the moments is equal to zero;

[0037] S6. The buoyancy of the ship when it floats is calculated based on the corresponding buoyancy center position of the ship when the sum of the moments is equal to zero, and the maximum support reaction force borne by the pier is calculated based on the gravity of the ship.

[0038] It is understandable that during the floating process, the ship does not float horizontally and stably, but due to the problem of eccentric center of gravity, the bow or stern of the ship first floats during the floating process, which causes the end support pier wood of the eccentric center of gravity to exceed the support reaction force affected by gravity. In order to specifically calculate the maximum support reaction force in this case, the present invention provides a method and terminal for calculating the support reaction force of the ship floating dock pier.

[0039] According to the position of the ship's center of gravity, the piers that provide support reaction force when the bow / stern is floating are selected, and the total moment caused by buoyancy and gravity on the pier is calculated. When the direction of the total moment is vertically downward, it means that the moment formed by buoyancy on the pier is still smaller than the moment formed by gravity on the pier, so no floating will occur at this time. When the direction of the total moment is vertically upward, it means that the moment formed by buoyancy on the pier is greater than the moment formed by gravity on the pier, and the ship will float in this case; the draft depths and corresponding buoyancy center positions under the two states are counted, and the corresponding ship buoyancy center position when the total moment is equal to zero is calculated using the linear interpolation method. At this time, the support reaction force borne by the pier is the largest, and the corresponding support reaction force is calculated based on the buoyancy and buoyancy center position. The force condition of the pier that provides the maximum support reaction force is intuitively calculated without modeling analysis, simplifying the calculation process.

[0040] Please refer to Figure 2 In an embodiment of the present invention, step S3 specifically includes the following steps:

[0041] S31, obtaining the distance LCG from the center of gravity of the ship to the side perpendicular line, the distance LCB from the current center of buoyancy of the ship to the side perpendicular line, and the distance L from the pier to the side perpendicular line;

[0042] S32, calculating the total moment M borne by the pier based on the buoyancy and the total weight of the ship, the formula is as follows:

[0043] M = Δ(LCB-L)-G(LCG-L);

[0044] Where Δ represents the buoyancy of the ship; G represents the total weight of the ship.

[0045] Specifically, the stress analysis of the pier wood is as follows:

[0046] (1) When the water in the dock is below the hull baseline, the partial gravity on the above-mentioned pier is R0;

[0047] (2) When the water in the dock is above the baseline of the hull and reaches the bow or stern buoyancy, since △*(LCB-L)-G*(LCG-L)<0, that is, the direction of the total moment is downward, the moment generated by the buoyancy on the above-mentioned piers is less than the moment generated by the gravity on the piers.

[0048] At this time, the force on the pier is R1 = R0-△*C1 (C1 is a constant, 0 <C1<1)

[0049] (3) When the water in the dock reaches a certain depth of the bow or stern buoyancy draft, the ship prepares to float with the above-mentioned pier as the fulcrum. At this time, the ship is subject to the gravity G, the buoyancy △2, and the pier support reaction force R2.

[0050] △2*(LCB2-L)-G*(LCG-L)=0, R2=G-△2.

[0051] (4) As the water level in the dock continues to rise, the buoyancy of the ship continues to increase until it is fully floated. The buoyancy is equal to the gravity, and the force on the pier is 0. At this time, the ship is subjected to the gravity G, the buoyancy △3, and the reaction force R3 of the pier support, R3 = G-△3.

[0052] It can be seen that during the floating process of the ship, the stress conditions of the above-mentioned piers are as follows:

[0053] R1<R0;

[0054] R3<R2;

[0055] At the same time, since the stress of the piers has been considered based on the ship's deadweight when arranging the piers, the stress of R0 is within the strength range of the piers. Therefore, the maximum stress that may exceed the stress range of the piers is R2. Generally speaking, when floating, the R2 of the ship with a trim is much larger than R0. Therefore, the support reaction force of the floating dock pier of the ship in the dock only needs to check whether R2 is within the stress range of the piers, thereby simplifying the calculation process. The support reaction force provided by the piers is calculated according to the above steps.

[0056] In an embodiment of the present invention, step S4 specifically includes the steps of:

[0057] If the direction of M is vertically downward, then the draft at this time is T n , the corresponding buoyancy of the ship is Δ n ; Description in T nUnder water, the buoyancy force on the above-mentioned pier wood moment is still smaller than the gravity force on the pier wood moment, so it will not float at this time, and the direction of the total moment is downward.

[0058] If the direction of M is vertically upward, then the draft at this time is T n+1 , the corresponding buoyancy of the ship is Δ n+1 ; This is a hypothetical state, assuming that the draft depth is T n+1 , but the ship still remains horizontal and does not float up. In this case, the moment of buoyancy on the above-mentioned piers is greater than the moment of gravity on the piers, so it can no longer remain horizontal. Due to the eccentric center of gravity, the bow or stern at the non-eccentric end will float up first.

[0059] The step S5 specifically comprises the following steps:

[0060] According to T n Calculate the distance LCB from the current center of buoyancy of the ship to the vertical line n , according to T n+1 Calculate the distance LCB from the current center of buoyancy of the ship to the vertical line n+1 ;

[0061] The interpolation method is used to calculate the ship's center of buoyancy position LCB2 corresponding to when the sum of the moments is equal to zero, and the formula is as follows:

[0062]

[0063] Where Δ2 represents the buoyancy required for the bow / stern of the ship to float.

[0064] From the above description, it can be seen that two draft depth data with opposite sums of two moments are obtained, and the draft depth when the sum of the moments is equal to zero is approximated by linear interpolation method.

[0065] According to △2*(LCB2-L)-G*(LCG-L)=0, and the formula for the ship's center of buoyancy position LCB2 corresponding to the moment sum equal to zero, it is derived as follows:

[0066] The step S6 specifically comprises the following steps:

[0067] The buoyancy Δ2 of the ship when it floats is obtained based on the corresponding ship buoyancy center position when the sum of the moments is equal to zero. The formula is as follows:

[0068]

[0069] Based on the ship's gravity, the maximum support reaction force R2 borne by the dock pier is calculated as follows:

[0070] R2=G-Δ2.

[0071] From the above description, it can be known that by solving the above equation about Δ2, the buoyancy Δ2 of the ship when floating can be obtained, and the maximum supporting reaction force provided by the pier can be calculated according to the above formula.

[0072] In an embodiment of the present invention, step S1 specifically includes the following steps:

[0073] Obtain the total gravity and center of gravity position of the ship, and determine the deviation of the center of gravity position. If the center of gravity is biased towards the bow, select the pier closest to the bow vertical line of the ship; if the center of gravity is biased towards the stern, select the pier closest to the stern vertical line of the ship.

[0074] From the above description, it can be known that the deviation of the center of gravity of the ship is used to determine whether the ship floats by the stern or the bow during the floating process, that is, the corresponding pier that bears the largest support reaction force is determined according to whether the center of gravity is biased towards the bow or the stern, which facilitates calculation.

[0075] Please refer to Figure 3 A terminal for calculating the reaction force of a ship's floating dock pier includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the above-mentioned method for calculating the reaction force of a ship's floating dock pier are completed. A terminal is provided as an execution carrier to execute the above-mentioned method steps to simplify the calculation of the reaction force of a ship's floating dock pier.

[0076] The present invention provides a method and a terminal for calculating the support reaction force of a ship floating dock, which are mainly used to calculate the maximum support reaction force borne by the dock during the floating process of the ship, so as to facilitate the verification of the strength of the dock. The following is a specific description in conjunction with an embodiment:

[0077] Please refer to Figure 1 and Figure 2 , Embodiment 1 of the present invention is:

[0078] A method for calculating the reaction force of a ship floating dock pier, comprising the steps of:

[0079] S1. Obtain the total gravity and center of gravity position of the ship, and select the pier closest to the ship's side vertical line on the side where the center of gravity of the ship is biased; that is, determine the deviation of the center of gravity position. If the center of gravity is biased towards the bow, select the pier closest to the ship's bow vertical line; if the center of gravity is biased towards the stern, select the pier closest to the ship's stern vertical line. Use the deviation of the center of gravity of the ship to determine whether it floats towards the stern or the bow during the floating process, that is, determine the corresponding pier that bears the largest support reaction force according to whether the center of gravity is biased towards the bow or the stern, so as to facilitate calculation.

[0080] S2. Calculate and count the buoyancy of each draft at equal depths and the distance from the ship's buoyancy center to the vertical line under the horizontal state of the ship. It can be understood that the above-mentioned horizontal state of the ship is a virtual state, that is, the ship remains horizontal and stationary at any draft depth and will not float. Specifically, the corresponding relationship between the ship's draft depth and buoyancy can refer to the hydrostatic table in the early stage of ship design. The draft T n =n*0.05(m) or T n =n*0.1(m), n=1,2,3…, list the buoyancy △ accordingly n 、Floating center LCB n ,n=1,2,3.

[0081] S3, calculating the total moment borne by the pier based on the buoyancy and the total weight of the ship;

[0082] S4, respectively selecting the draft depths corresponding to when the direction of the total moment is vertically upward and when the direction of the total moment is vertically downward;

[0083] S5. Extract the ship's buoyancy center position when the total moment is vertically upward and the ship's buoyancy center position when the total moment is vertically downward according to the draft depth, and use a linear interpolation method to obtain the ship's buoyancy center position corresponding to when the total moment is equal to zero;

[0084] S6. The buoyancy of the ship when it floats is calculated based on the corresponding position of the buoyancy center of the ship when the total moment is equal to zero, and the maximum support reaction force borne by the pier is calculated based on the gravity of the ship.

[0085] Wherein, step S3 specifically includes the steps of:

[0086] S31, obtaining the distance LCG from the center of gravity of the ship to the side perpendicular line, the distance LCB from the current center of buoyancy of the ship to the side perpendicular line, and the distance L from the pier to the side perpendicular line;

[0087] S32. Calculate the total moment M borne by the pier based on the buoyancy and the total weight of the ship, using the following formula:

[0088] M = Δ(LCB-L)-G(LCG-L);

[0089] Where Δ represents the buoyancy of the ship; G represents the total weight of the ship.

[0090] Specifically, the stress analysis of the pier wood is as follows:

[0091] (1) When the water in the dock is below the hull baseline, the partial gravity on the above-mentioned pier is R0;

[0092] (2) When the water in the dock is above the baseline of the hull and reaches the bow or stern buoyancy draft, since △*(LCB-L)-G*(LCG-L)<0 at this time, that is, the direction of the total moment is downward, the moment generated by the buoyancy on the above-mentioned piers is less than the moment generated by gravity on the piers, so the buoyancy moment acting on the piers is 0 at this time.

[0093] At this time, the force on the pier is R1 = R0-△*C1 (C1 is an empirical constant)

[0094] (3) When the water in the dock reaches a certain depth of the bow or stern buoyancy draft, the ship prepares to float with the above-mentioned pier as the fulcrum. At this time, the ship is subject to the gravity G, the buoyancy △2, and the pier support reaction force R2.

[0095] △2*(LCB2-L)-G*(LCG-L)=0, R2=G-△2.

[0096] (4) When the water level in the dock continues to rise, the buoyancy of the ship continues to increase until it is completely floating, the buoyancy is equal to the gravity, and the force on the pier is 0.

[0097] It can be seen that during the floating process of the ship, the stress conditions of the above-mentioned piers are as follows:

[0098] R1<R0;

[0099] R3<R2;

[0100] At the same time, since the stress of the piers has been considered based on the ship's deadweight when arranging the piers, the stress of R0 is within the strength range of the piers. Therefore, the maximum stress that may exceed the stress range of the piers is R2. Generally speaking, when floating, the R2 of the ship with a trim is much larger than R0. Therefore, the support reaction force of the floating dock pier of the ship in the dock only needs to check whether R2 is within the stress range of the piers, thereby simplifying the calculation process. The support reaction force provided by the piers is calculated according to the above steps.

[0101] Step S4 specifically includes the following steps:

[0102] If the direction of M is vertically downward, then the draft at this time is T n , the corresponding buoyancy of the ship is Δ n ; Description in T n Under water, the buoyancy force on the above-mentioned pier wood moment is still smaller than the gravity force on the pier wood moment, so it will not float at this time, and the direction of the total moment is downward.

[0103] If the direction of M is vertically upward, then the draft at this time is T n+1 , the corresponding buoyancy of the ship is Δ n+1 ; This is a hypothetical state, assuming that the draft depth is T n+1, but the ship still remains horizontal and does not float up. In this case, the moment of buoyancy on the above-mentioned piers is greater than the moment of gravity on the piers, so it can no longer remain horizontal. Due to the eccentric center of gravity, the bow or stern far away from the center end will float up first.

[0104] Step S5 specifically includes the following steps:

[0105] According to T n Calculate the distance LCB from the current center of buoyancy of the ship to the vertical line n , according to T n+1 Calculate the distance LCB from the current center of buoyancy of the ship to the vertical line n+1 ;

[0106] The interpolation method is used to calculate the ship's center of buoyancy position LCB2 when the total moment is equal to zero. The formula is as follows:

[0107]

[0108] Where Δ2 represents the buoyancy required for the bow / stern of the ship to float.

[0109] From the above description, it can be seen that two draft depth data with opposite sums of two moments are obtained, and the draft depth when the sum of the moments is equal to zero is approximated by linear interpolation method.

[0110] According to △2*(LCB2-L)-G*(LCG-L)=0, and the calculation formula of the ship's center of buoyancy position LCB2 corresponding to the moment sum equal to zero, it is derived as follows:

[0111] Step S6 specifically includes the following steps:

[0112] The buoyancy Δ2 of the ship when it floats is obtained based on the corresponding position of the ship's buoyancy center when the sum of the moments is equal to zero. The formula is as follows:

[0113]

[0114] Based on the ship's gravity, the maximum support reaction force R2 borne by the dock pier is calculated as follows:

[0115] R2=G-Δ2.

[0116] Please refer to Figure 2 , Embodiment 2 of the present invention is:

[0117] A calculation terminal 1 for the reaction force of a ship floating dock pier includes a memory 2, a processor 3, and a computer program stored in the memory 2 and executable on the processor 3. When the processor 3 executes the computer program, the steps in the calculation method for the reaction force of a ship floating dock pier are completed.

[0118] In summary, the present invention provides a method and terminal for calculating the supporting reaction force of ship floating dock piers, and selects piers that provide supporting reaction force when the bow / stern is floating according to the center of gravity position of the ship, and calculates the sum of the moments caused by buoyancy and gravity on the pier. When the direction of the sum of the moments is vertically downward, it means that the moment formed by buoyancy on the pier is still smaller than the moment formed by gravity on the pier, so no floating will occur at this time. When the direction of the sum of the moments is vertically upward, it means that the moment formed by buoyancy on the pier is greater than the moment formed by gravity on the pier, and in this case the ship is about to float; the draft depths and the corresponding center of buoyancy positions under the two states are counted, and the corresponding center of buoyancy position of the ship when the sum of the moments is equal to zero is calculated by linear interpolation method, at this time the supporting reaction force borne by the pier is the largest, and the corresponding supporting reaction force is calculated according to the buoyancy and the center of buoyancy position, and the force condition of the pier that provides the maximum supporting reaction force is intuitively calculated, without the need for modeling analysis, and the calculation process is simplified. The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for calculating the reaction force of a ship floating dock pier, characterized in that: Includes steps: S1. Obtain the total gravity and center of gravity of the ship, and select the pier located on one side of the center of gravity of the ship and closest to the vertical line of the ship; S2. Calculate and count the buoyancy of the ship at various draft depths and the distance from the center of buoyancy to the vertical line of the ship when the ship is in a horizontal state; S3, calculating the total moment borne by the pier based on the buoyancy and the total weight of the ship; S4, respectively selecting the draft depths corresponding to when the direction of the sum of the moments is vertically upward and when the direction of the sum of the moments is vertically downward; S5, extracting the buoyancy center position of the ship when the sum of the moments is vertically upward and the buoyancy center position of the ship when the sum of the moments is vertically downward according to the draft depth, and using a linear interpolation method to obtain the buoyancy center position of the ship when the sum of the moments is equal to zero; S6. The buoyancy of the ship when it floats is calculated based on the corresponding buoyancy center position of the ship when the sum of the moments is equal to zero, and the maximum support reaction force borne by the pier is calculated based on the gravity of the ship.

2. A method for calculating the reaction force of a ship floating dock pier according to claim 1, characterized in that: The step S3 specifically comprises the following steps: S31, obtaining the distance LCG from the center of gravity of the ship to the side perpendicular line, the distance LCB from the current center of buoyancy of the ship to the side perpendicular line, and the distance L from the pier to the side perpendicular line; S32, calculating the total moment M borne by the pier based on the buoyancy and the total weight of the ship, the formula is as follows: M = Δ(LCB-L)-G(LCG-L); Where Δ represents the buoyancy of the ship; G represents the total weight of the ship.

3. A method for calculating the reaction force of a ship floating dock according to claim 2, characterized in that: The step S4 specifically comprises the following steps: If the direction of the moment sum M is vertically downward, then the draft at this time is T n , the corresponding buoyancy of the ship is Δ n ; If the direction of the moment sum M is vertically upward, then the draft at this time is T n+1 , the corresponding buoyancy of the ship is Δ n+1 ; The step S5 specifically includes the following steps: According to T n Calculate the distance LCB from the current center of buoyancy of the ship to the vertical line n , according to T n+1 Calculate the distance LCB from the current center of buoyancy of the ship to the vertical line n+1 ; The interpolation method is used to calculate the ship's center of buoyancy position LCB2 corresponding to when the sum of the moments is equal to zero, and the formula is as follows: Where Δ2 represents the buoyancy required for the bow / stern of the ship to float.

4. A method for calculating the reaction force of a ship floating dock according to claim 3, characterized in that: The step S6 specifically comprises the following steps: The buoyancy Δ2 of the ship when it floats is obtained based on the corresponding ship buoyancy center position when the sum of the moments is equal to zero. The formula is as follows: Based on the ship's gravity, the maximum support reaction force R2 borne by the dock pier is calculated as follows: R2=G-Δ2.

5. The method for calculating the reaction force of a ship floating dock according to claim 1, characterized in that: The step S1 specifically includes the following steps: Obtain the total gravity and center of gravity position of the ship, and determine the deviation of the center of gravity position. If the center of gravity is biased towards the bow, select the pier closest to the bow vertical line of the ship; if the center of gravity is biased towards the stern, select the pier closest to the stern vertical line of the ship.

6. A calculation terminal for reaction force of a ship floating dock pier, characterized in that: The invention comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the following steps are performed: S1. Obtain the total gravity and center of gravity of the ship, and select the pier located on one side of the center of gravity of the ship and closest to the vertical line of the ship; S2. Calculate and count the buoyancy of the ship at various draft depths and the distance from the center of buoyancy to the vertical line of the ship when the ship is in a horizontal state; S3, calculating the total moment borne by the pier based on the buoyancy and the total weight of the ship; S4, respectively selecting the draft depths corresponding to when the direction of the sum of the moments is vertically upward and when the direction of the sum of the moments is vertically downward; S5, extracting the buoyancy center position of the ship when the sum of the moments is vertically upward and the buoyancy center position of the ship when the sum of the moments is vertically downward according to the draft depth, and using a linear interpolation method to obtain the buoyancy center position of the ship when the sum of the moments is equal to zero; S6. The buoyancy of the ship when it floats is calculated based on the corresponding buoyancy center position of the ship when the sum of the moments is equal to zero, and the maximum support reaction force borne by the pier is calculated based on the gravity of the ship.

7. A calculation terminal for reaction force of a ship floating dock pier according to claim 6, characterized in that: The step S3 specifically comprises the following steps: S31, obtaining the distance LCG from the center of gravity of the ship to the side perpendicular line, the distance LCB from the current center of buoyancy of the ship to the side perpendicular line, and the distance L from the pier to the side perpendicular line; S32, calculating the total moment M borne by the pier based on the buoyancy and the total weight of the ship, the formula is as follows: M = Δ(LCB-L)-G(LCG-L); Where Δ represents the buoyancy of the ship; G represents the total weight of the ship.

8. A calculation terminal for reaction force of a ship floating dock pier according to claim 7, characterized in that: The step S4 specifically comprises the following steps: If the direction of the moment sum M is vertically downward, then the draft at this time is T n , the corresponding buoyancy of the ship is Δ n ; If the direction of the moment sum M is vertically upward, then the draft at this time is T n+1 , the corresponding buoyancy of the ship is Δ n+1 ; The step S5 specifically includes the following steps: According to T n Calculate the distance LCB from the current center of buoyancy of the ship to the vertical line n , according to T n+1 Calculate the distance LCB from the current center of buoyancy of the ship to the vertical line n+1 ; The interpolation method is used to calculate the ship's center of buoyancy position LCB2 corresponding to when the sum of the moments is equal to zero, and the formula is as follows: Where Δ2 represents the buoyancy required for the bow / stern of the ship to float.

9. A calculation terminal for reaction force of a ship floating dock pier according to claim 8, characterized in that: The step S6 specifically comprises the following steps: The buoyancy Δ2 of the ship when it floats is obtained based on the corresponding ship buoyancy center position when the sum of the moments is equal to zero. The formula is as follows: Based on the ship's gravity, the maximum support reaction force R2 borne by the dock pier is calculated as follows: R2=G-Δ2.

10. A calculation terminal for reaction force of a ship floating dock pier according to claim 6, characterized in that: The step S1 specifically includes the following steps: Obtain the total gravity and center of gravity position of the ship, and determine the deviation of the center of gravity position. If the center of gravity is biased towards the bow, select the pier closest to the bow vertical line of the ship; if the center of gravity is biased towards the stern, select the pier closest to the stern vertical line of the ship.

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