Method and system for calculating maximum wave height of ship traveling wave at closed end of ship chamber of ship lift with middle channel

Abstract

The invention discloses a method and a system for calculating the maximum wave height of ship traveling waves at the closed end of a ship lift chamber with a middle channel. The method comprises the following steps: determining a navigation path of a ship driving out of a first-stage ship lift chamber and driving into a second-stage ship chamber through the middle channel; acquiring ship parameters and an intermediate channel scale; the maximum navigational speed V of the ship in the channel is determined, and the Froude number is calculated; and substituting the parameters into a dimensionless regression model, and directly calculating the maximum wave height of the closed end of the ship chamber. According to the method, the influence of closed end reflection, fluctuation superposition, channel section coefficient and ship scale coupling is comprehensively considered for the first time, the defects that an existing empirical formula is only suitable for an open water area and neglects the closed boundary effect are overcome, the prediction precision of the maximum wave height of the ship traveling wave of the middle channel of the combined ship lift is remarkably improved, and the prediction accuracy is improved. And a reliable basis is provided for safe operation and channel optimization design of the multi-stage ship lift.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of water conservancy navigation structures, and particularly relates to a ship wave maximum wave height calculation method and system for a closed end of a ship chamber of a ship lift with an intermediate channel. BACKGROUND

[0002] Most of the hydropower hubs in the central and western regions of China are high dams, and the navigation structures of high dams generally face problems such as complex construction environment, large water level fluctuation between upstream and downstream, limited layout space, and uneven distribution of water resources in time and space. When the terrain, geological conditions are limited or the required lifting height is high, a combined navigation structure lifting scheme can be used. In the combined navigation structure layout scheme, the upper and lower navigation structures are connected through an intermediate channel, and the intermediate channel mainly includes navigation open channels, navigation tunnels and navigation aqueducts. The intermediate channel is a closed and narrow water area. For the intermediate channel, which is a restricted waterway, it has special use characteristics, mainly manifested as follows: both ends are in a closed state; the channel is a narrow water area with a small cross-section coefficient; the ship navigation or navigation structure operation will generate complex long-period wave flow movement in the channel; and there is no uniform standard for the channel cross-section size in China.

[0003] When the navigation structures at both ends of the intermediate channel are ship lifts, the ship passes through the ship lift and needs to go through a series of processes such as ship lift chamber docking and ship chamber exit. During the ship navigation in the channel, the non-constant flow fluctuation phenomenon in the intermediate channel is more obvious, and even the overall water level rise will be caused, which will affect the ship lift chamber docking process and affect the safe operation of the ship lift.

[0004] In the prior art, through analysis of the measured data, the relationship between the ship wave height and the weight, ship type, speed, water depth and other factors of the navigation ship is obtained, and a series of empirical formulas are established. However, these empirical formulas are mostly obtained under the condition of open water or assuming infinite water depth, and are limited to specific ship types, and have strong regional and ship type limitations. At the same time, the existing empirical formulas ignore the fact that the fluctuation superposition in the intermediate channel is a complex process affected by multiple factors such as the channel size, ship speed and other factors, and the interaction mechanism between the factors is complex, so the current formulas cannot accurately predict the closed end ship wave height in the intermediate channel.

[0005] Patent CN116738706A proposes a method for predicting the maximum wave height of ship traveling waves in restricted waterways. By establishing a physical model test system and combining it with a particle swarm optimization algorithm to solve for the undetermined coefficients in the prediction equation, the method can improve the prediction accuracy of the maximum wave height of ship traveling waves in restricted waterways to a certain extent. However, this method is mainly applicable to general restricted waterways, does not consider the special boundary conditions at the closed end of the ship lift, and does not solve the problem of wave height amplification caused by the superposition of reflected waves and ship traveling waves at the closed end. Therefore, it cannot be directly applied to the prediction of the maximum wave height of ship traveling waves at the closed end of a ship lift with an intermediate channel.

[0006] In summary, existing methods for calculating ship wave height have significant limitations. They cannot fully consider the influence of factors such as channel cross-sectional coefficient, closed-end position, and wave superposition in intermediate channels, making it difficult to meet the actual needs of engineering design. Therefore, a method for calculating the maximum ship wave height at the closed end of a ship lift with an intermediate channel is needed to ensure the safe and stable operation of multi-stage ship lifts. Summary of the Invention

[0007] Purpose of the Invention: This invention provides a method and system for calculating the maximum wave height of ships at the closed end of a ship lift with an intermediate channel. It aims to address the limitation that existing methods for calculating ship wave height are only applicable to open waters or infinitely deep conditions. This invention provides a method suitable for calculating the maximum wave height of ships in a narrow, elongated channel with closed ends. It considers not only the generation of ship waves but also the superposition of wave fluctuations within the channel with a small cross-sectional coefficient, directly determining the maximum wave height at the closed end of the ship lift. This provides more specific guidance for the layout of combined navigation structures and ship navigation methods.

[0008] Technical solution: This invention provides a method for calculating the maximum wave height of a ship traveling at the closed end of a ship lift with an intermediate channel, including:

[0009] The ship's route is determined to be that it exits from the first-stage ship lift cabin and enters the second-stage ship lift cabin through the intermediate channel.

[0010] Determine the data collection parameters for the ship and the intermediate channel, and establish a maximum wave height regression model;

[0011] Based on the data collection parameters of the ship and the intermediate channel, ship simulation data and intermediate channel simulation data are collected along the ship's travel path. Ship speed simulation data and maximum wave height simulation data of the ship traveling at the closed end of the ship lift are also collected. The ship simulation data, intermediate channel simulation data, maximum speed simulation data, and maximum wave height simulation data are combined to form a water surface wave height simulation dataset.

[0012] Based on the simulated water surface wave height dataset, a maximum wave height regression model is fitted, and the coefficients of the maximum wave height regression model that satisfy the simulated data are solved.

[0013] Collect current ship parameters, intermediate channel parameters, and the maximum speed at which the ship is stably sailing in the intermediate channel. Substitute these into the fitted maximum wave height regression model to calculate the maximum wave height of the ship's traveling wave at the closed end of the ship lift chamber.

[0014] Furthermore, the parameters collected for the vessel include the vessel's width, length, and draft; the parameters collected for the intermediate channel include the channel width, length, and depth.

[0015] Furthermore, the establishment of the maximum wave height regression model includes:

[0016] We construct a dimensionless set of factors affecting the maximum wave height of a ship's sailing waves using the π theorem, and establish a dimensionless function with the following formula:

[0017] ;

[0018] in, The maximum wave height of the ship traveling at the closed end of the ship lift chamber. Because the canal is deep, For the ship's draft, For channel width, For the ship's width, For channel length, V is the ship's length, V is the ship's speed, and g is the acceleration due to gravity.

[0019] A maximum wave height regression model is constructed based on a dimensionless function, and the formula is as follows:

[0020] ;

[0021] in, For Froude number, The constant coefficients, for The exponential coefficient, for The exponential coefficient, for The exponential coefficient, for The exponential coefficient;

[0022] The Froude number is calculated using the formula:

[0023] ;

[0024] Where V is the ship's speed. Let g be the water depth in the channel, and g be the acceleration due to gravity.

[0025] Furthermore, the fitted maximum wave height regression model is obtained by performing multiple linear regression using the least squares method to solve for the coefficients in the maximum wave height regression model.

[0026] This invention also provides a system for calculating the maximum wave height of a ship traveling at the closed end of a ship lift with an intermediate channel, comprising:

[0027] The path module is used to determine the ship's travel path, which is to exit the first-stage ship lift cabin and enter the second-stage ship lift cabin through the intermediate channel.

[0028] The parameter model module is used to determine the data collection parameters for ships and intermediate channels, and to establish a maximum wave height regression model.

[0029] The simulation data acquisition module is used to collect ship simulation data and intermediate channel simulation data in the ship's travel path according to the ship's acquisition parameters and intermediate channel acquisition parameters, and to collect ship speed simulation data and maximum wave height simulation data of the ship's traveling wave at the closed end of the ship lift chamber. The ship simulation data, intermediate channel simulation data, maximum speed simulation data, and maximum wave height simulation data are combined into a water surface wave height simulation dataset.

[0030] The fitting module is used to fit the maximum wave height regression model based on the simulated water surface wave height dataset and solve for the coefficients of the maximum wave height regression model that satisfy the simulated data.

[0031] The calculation module is used to collect current ship parameters, intermediate channel parameters, and the maximum speed at which the ship can sail stably in the intermediate channel. These parameters are then substituted into the fitted maximum wave height regression model to calculate the maximum wave height of the ship's traveling wave at the closed end of the ship lift chamber.

[0032] Furthermore, in the parameter model module, the collected parameters for the ship include the ship's width, ship's length, and ship's draft; the collected parameters for the intermediate channel include the channel width, channel length, and channel water depth.

[0033] Furthermore, in the parameter model module, establishing the maximum wave height regression model includes:

[0034] We construct a dimensionless set of factors affecting the maximum wave height of a ship's sailing waves using the π theorem, and establish a dimensionless function with the following formula:

[0035] ;

[0036] in, The maximum wave height of the ship traveling at the closed end of the ship lift chamber. Because the canal is deep, For the ship's draft, For channel width, For the ship's width, For channel length, V is the ship's length, V is the ship's speed, and g is the acceleration due to gravity.

[0037] A maximum wave height regression model is constructed based on a dimensionless function, and the formula is as follows:

[0038] ;

[0039] in, For Froude number, The constant coefficients, for The exponential coefficient, for The exponential coefficient, for The exponential coefficient, for The exponential coefficient;

[0040] The Froude number is calculated using the formula:

[0041] ;

[0042] Where V is the ship's speed. Let g be the water depth in the channel, and g be the acceleration due to gravity.

[0043] Furthermore, in the fitting module, the fitting maximum wave height regression model is obtained by performing multiple linear regression using the least squares method to solve for the coefficients in the maximum wave height regression model.

[0044] The present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-described method.

[0045] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the above-described method.

[0046] Beneficial Effects: This invention provides a method and system for calculating the maximum wave height of ship travel waves at the closed end of a ship lift with an intermediate channel. Compared with existing technologies, this invention not only considers the generation of ship travel waves but also the superposition phenomenon of fluctuations in the small cross-sectional coefficients at the closed end. It can accurately reflect the maximum wave height at the closed end of the ship lift after docking with the intermediate channel, rather than simply obtaining the isolated wave height of the ship travel waves. In addition, this invention breaks through the limitations of the boundary conditions of existing ship travel wave calculation formulas and can be applied to the cross-sectional design of intermediate channels under different scale conditions, meeting the actual needs of combined navigation structure engineering. Furthermore, this invention establishes a more universal calculation model based on dimensionless parameters, avoiding the failure problem of empirical formulas when they exceed their applicable range, and the reliability and scalability of the calculation method are stronger. Attached Figure Description

[0047] Figure 1 This is a layout diagram of the combined ship lift with intermediate channel of the present invention.

[0048] Figure 2 This is a graph showing the relationship between the maximum wave height of the ship traveling at the closed end of the ship lift in the middle channel, the channel water depth, and the Froude number.

[0049] Figure 3 This is a graph showing the relationship between the maximum wave height of the ship at the closed end of the ship lift in the middle channel and the ratio of the channel depth to the ratio of the channel width to the ship width.

[0050] Figure 4 This is a graph showing the relationship between the maximum wave height of the ship traveling at the closed end of the ship lift in the middle channel and the ratio of the channel water depth to the ratio of the channel water depth to the ship's draft.

[0051] Figure 5 The graph shows the relationship between the maximum wave height of the ship at the closed end of the ship lift in the middle channel and the channel water depth, and the ratio of the channel length to the ship length, when the section coefficient is 1.88.

[0052] Figure 6 The graph shows the relationship between the maximum wave height of the ship at the closed end of the ship lift in the middle channel and the channel water depth, and the ratio of the channel length to the ship length, when the section coefficient is 2.25.

[0053] Figure 7 Comparison of the calculated results of the formula for the maximum wave height of the ship traveling at the closed end of the ship chamber of the intermediate channel ship lift with the results of the numerical simulation calculation. Detailed Implementation

[0054] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0055] Example 1

[0056] This invention provides a method for calculating the maximum wave height of a ship traveling at the closed end of a ship lift with an intermediate channel, comprising:

[0057] The ship's route is determined to be that it exits from the first-stage ship lift cabin and enters the second-stage ship lift cabin through the intermediate channel.

[0058] Determine the data collection parameters for the ship and the intermediate channel, and establish a maximum wave height regression model;

[0059] Based on the data collection parameters of the ship and the intermediate channel, ship simulation data and intermediate channel simulation data are collected along the ship's travel path. Ship speed simulation data and maximum wave height simulation data of the ship traveling at the closed end of the ship lift are also collected. The ship simulation data, intermediate channel simulation data, maximum speed simulation data, and maximum wave height simulation data are combined to form a water surface wave height simulation dataset.

[0060] Based on the simulated water surface wave height dataset, a maximum wave height regression model is fitted, and the coefficients of the maximum wave height regression model that satisfy the simulated data are solved.

[0061] Collect current ship parameters, intermediate channel parameters, and the maximum speed at which the ship is stably sailing in the intermediate channel. Substitute these into the fitted maximum wave height regression model to calculate the maximum wave height of the ship's traveling wave at the closed end of the ship lift chamber.

[0062] In this embodiment,

[0063] First, the ship's navigation path is defined: the ship exits from the first-stage ship lift cabin, passes through the intermediate channel, and enters the second-stage ship lift cabin; the combined ship lift arrangement with the intermediate channel in this invention is as follows: Figure 1 As shown;

[0064] When a ship navigates within the intermediate channel, its motion disturbs the water, inducing the formation and propagation of ship waves. When the ship begins to move from a stationary state, the compression of the water by the hull initially creates a bow solitary wave. This bow solitary wave then propagates longitudinally. As it moves away from the ship and reaches the closed end of the intermediate channel, it is reflected. The reflected wave superimposes with subsequent wave trains, resulting in a higher wave height than the original bow solitary wave. Influenced by the ship's speed, the subsequent wave trains continuously catch up with and interact with the superimposed reflected wave train, causing the wave to oscillate back and forth within the channel. The superposition of the propulsive wave and the reflected wave creates complex wave patterns. The wave may reflect multiple times within the intermediate channel, and the wave amplitude exhibits significant differences at different locations within the channel.

[0065] Within the intermediate channel of a navigation structure, numerous factors influence the wave height of ships, including not only ship navigation conditions such as ship dimensions, draft, and speed, but also fluid characteristic parameters such as density and gravitational acceleration, as well as boundary conditions such as channel width, channel depth, and channel length.

[0066] This invention determines the acquisition parameters for the ship and the intermediate channel. The ship acquisition parameters include the ship's width B (characterizing the ship's lateral dimension), the ship's length L (characterizing the ship's longitudinal dimension), and the ship's draft T (characterizing the depth of the ship's underwater portion, directly affecting the intensity of the ship's disturbance to the water body). The intermediate channel acquisition parameters include the channel width b (reflecting the channel's lateral boundary conditions), the channel length l (determining the propagation and reflection path of waves within the channel), and the channel water depth h (affecting the propagation speed of ship waves and their interaction with the boundary).

[0067] The relationship between the factors affecting the maximum wave height of a ship's sailing waves can be described as follows:

[0068] ;

[0069] in, For the ship's width, For the length of the ship, V represents the ship's draft, and V represents the ship's maximum speed for stable navigation in the intermediate channel. For channel width, Because the canal is deep, Let ρ be the length of the channel, ρ be the density of water, and g be the acceleration due to gravity.

[0070] Since the ship's width B, length L, draft T, speed V, channel width b, channel depth h, channel length l, water density ρ, and gravitational acceleration g are independent of each other, the relationships between the factors affecting the ship's wave height can be constructed using the π theorem to create a dimensionless set of parameters, thus simplifying the original multivariate relationships into dimensionless functional forms:

[0071] ;

[0072] in, , , , As the impact factor, The ratio reflecting the underwater portion of a ship to the depth of the water. Reflects the degree of horizontal restriction on the channel. It reflects the matching relationship between channel length and ship dimensions. The Froude number measures the ratio of a ship's speed to the wave speed in shallow water and is an indicator of whether a ship's wave has entered a nonlinear solitary wave pattern.

[0073] After obtaining the dimensionless functional relationship, this invention establishes a maximum wave height regression model based on the influencing factors affecting the maximum wave height of ship waves, with the following formula:

[0074] ;

[0075] in, The maximum wave height of the ship traveling at the closed end of the ship lift chamber. For Froude number, Because the canal is deep, For the ship's draft, For channel width, For the ship's width, For channel length, For the length of the ship, The constant coefficients, for The exponential coefficient, for The exponential coefficient, for The coefficient of the power of , for The exponential coefficient.

[0076] To solve the maximum wave height regression model, this invention conducted simulation experiments to explore the influence of independent variables on the maximum wave height in the maximum wave height regression model. The simulation environment adopted... Figure 1 The arrangement method.

[0077] Based on the data collection parameters of the ship and the intermediate channel, simulated data of the ship and the intermediate channel are collected along the ship's travel path. Simulated data of the maximum speed of the ship during stable navigation in the intermediate channel and simulated data of the maximum wave height of the ship's traveling wave at the closed end of the ship lift are also collected to form a simulated data set of water surface wave height.

[0078] To investigate the relationship between the maximum wave height of the ship's traveling wave at the closed end of a ship lift with a central channel and the Froude number, this invention constructs a set of generalized numerical simulation experiments. Under the premise of fixed channel water depth h, channel length l, channel width b, and ship dimensions (L, B, T), only the ship's speed V is changed to influence the Froude number. Single-variable control was performed, with different Froude numbers as the independent variable on the x-axis and the ratio of the maximum wave height of the ship traveling at the closed end of the ship lift in the intermediate channel to the channel water depth as the y-axis, and a curve was plotted to obtain the results. Figure 2 It can be seen that as the Froude number increases, the maximum wave height of the ship traveling at the closed end of the ship lift with intermediate channel also increases. Further analysis reveals that as the section coefficient n (obtained by multiplying h / T and b / B) decreases, the trend of the maximum wave height increasing with ship speed becomes more pronounced.

[0079] To study the relationship between the maximum wave height of the ship's traveling wave at the closed end of the ship lift with a central channel and the section coefficient n, this invention uses a fixed Froude number. Given the channel length l, ship length L, channel depth h, and ship draft T, a curve is plotted with the ratio of channel width to ship width as the x-axis and the ratio of the maximum wave height of the ship at the closed end of the ship lift in the middle channel to the channel depth as the y-axis. Figure 3 ;

[0080] With a fixed Froude number Given the channel length l, ship length L, channel width b, and ship width B, plot a curve with the ratio of channel depth h to ship draft T as the x-axis and the ratio of the maximum wave height of the ship at the closed end of the intermediate channel ship lift to the channel depth as the y-axis. Figure 4 ;

[0081] from Figure 3 and Figure 4 It can be seen that the maximum wave height decreases as the beam ratio b / B and water depth ratio h / T increase. Further analysis reveals that as the ship speed V increases, the decreasing trend of maximum wave height with increasing beam ratio b / B and water depth ratio h / T becomes more pronounced, and h / T has a greater influence than b / B among the section coefficients.

[0082] Because the ship length is fixed, in order to study the relationship between the maximum wave height of the ship's traveling wave at the closed end of the ship lift with intermediate channel and the channel length, this invention uses a fixed Froude number. Given the ship length L, channel water depth h, channel width b, and ship width B, with the channel-to-ship length ratio l / L as the abscissa and the ratio of the maximum wave height of the ship traveling at the closed end of the intermediate channel ship lift to the channel water depth as the ordinate, a curve is plotted when the section coefficient n is 1.88. Figure 5 When the section coefficient n is 2.25, the curve obtained is... Figure 6 ,;from Figure 5 and Figure 6 It can be seen that when the ship speed V is less than 1.5 m / s, the trend of water surface wave height in the middle channel is not obvious with the increase of channel length; when the ship speed V is greater than 1.5 m / s, the water surface wave height in the middle channel increases with the increase of channel length.

[0083] Based on simulated ship data, intermediate channel data, maximum speed data, and maximum wave height data, the maximum wave height regression model is substituted into the data. Considering the influence of each factor on the maximum wave height, the least squares method is used to fit the maximum wave height regression model. The constant coefficients and exponential coefficients of the maximum wave height regression model that satisfies the simulated data are then calculated to obtain the fitted maximum wave height regression model.

[0084] ;

[0085] The data from the simulated water surface wave height dataset are substituted into the fitted maximum wave height regression model calculation formula and compared with the simulated maximum wave height data. Figure 7 .from Figure 7 It can be observed that the simulated data fits the maximum wave height regression model quite well. Therefore, in a combined ship lift arrangement with an intermediate channel, the parameters ship width B, ship length L, ship draft T, ship speed V, channel width b, channel depth h, and channel length l can be substituted into the maximum wave height regression model to calculate the maximum wave height of the ship's traveling wave at the closed end of the ship lift chamber.

[0086] Collect current ship parameters, intermediate channel parameters, and the maximum speed at which the ship is stably sailing in the intermediate channel. Substitute these into the fitted maximum wave height regression model to calculate the maximum wave height of the ship's traveling wave at the closed end of the ship lift chamber.

[0087] Example 2

[0088] Based on Embodiment 1, the present invention also provides a system for calculating the maximum wave height of a ship traveling at the closed end of a ship lift with an intermediate channel, comprising:

[0089] The path module is used to determine the ship's travel path, which is to exit the first-stage ship lift cabin and enter the second-stage ship lift cabin through the intermediate channel.

[0090] The parameter model module is used to determine the data collection parameters for ships and intermediate channels, and to establish a maximum wave height regression model.

[0091] The simulation data acquisition module is used to collect ship simulation data and intermediate channel simulation data in the ship's travel path according to the ship's acquisition parameters and intermediate channel acquisition parameters, and to collect ship speed simulation data and maximum wave height simulation data of the ship's traveling wave at the closed end of the ship lift chamber. The ship simulation data, intermediate channel simulation data, maximum speed simulation data, and maximum wave height simulation data are combined into a water surface wave height simulation dataset.

[0092] The fitting module is used to fit the maximum wave height regression model based on the simulated water surface wave height dataset and solve for the coefficients of the maximum wave height regression model that satisfy the simulated data.

[0093] The calculation module is used to collect current ship parameters, intermediate channel parameters, and the maximum speed at which the ship can sail stably in the intermediate channel. These parameters are then substituted into the fitted maximum wave height regression model to calculate the maximum wave height of the ship's traveling wave at the closed end of the ship lift chamber.

[0094] In this embodiment,

[0095] The path module defines the ship's navigation path: the ship exits from the first-stage ship lift cabin, passes through the intermediate channel, and enters the second-stage ship lift cabin; the combined ship lift arrangement with the intermediate channel in this invention is as follows:Figure 1 As shown;

[0096] When a ship navigates within the intermediate channel, its motion disturbs the water, inducing the formation and propagation of ship waves. When the ship begins to move from a stationary state, the compression of the water by the hull initially creates a bow solitary wave. This bow solitary wave then propagates longitudinally. As it moves away from the ship and reaches the closed end of the intermediate channel, it is reflected. The reflected wave superimposes with subsequent wave trains, resulting in a higher wave height than the original bow solitary wave. Influenced by the ship's speed, the subsequent wave trains continuously catch up with and interact with the superimposed reflected wave train, causing the wave to oscillate back and forth within the channel. The superposition of the propulsive wave and the reflected wave creates complex wave patterns. The wave may reflect multiple times within the intermediate channel, and the wave amplitude exhibits significant differences at different locations within the channel.

[0097] Within the intermediate channel of a navigation structure, numerous factors influence the wave height of ships, including not only ship navigation conditions such as ship dimensions, draft, and speed, but also fluid characteristic parameters such as density and gravitational acceleration, as well as boundary conditions such as channel width, channel depth, and channel length.

[0098] In the parameter model module, this invention determines the acquisition parameters of the ship and the intermediate channel. The ship acquisition parameters include the ship's width B (characterizing the ship's lateral dimension), the ship's length L (characterizing the ship's longitudinal dimension), and the ship's draft T (characterizing the depth of the ship's underwater portion, directly affecting the intensity of the ship's disturbance to the water body). The intermediate channel acquisition parameters include the channel width b (reflecting the channel's lateral boundary conditions), the channel length l (determining the propagation and reflection path of waves within the channel), and the channel water depth h (affecting the propagation speed of ship waves and their interaction with the boundary).

[0099] The relationship between the factors affecting the maximum wave height of a ship's sailing waves can be described as follows:

[0100] ;

[0101] in, For the ship's width, For the length of the ship, V represents the ship's draft, and V represents the ship's maximum speed for stable navigation in the intermediate channel. For channel width, Because the canal is deep, Let ρ be the length of the channel, ρ be the density of water, and g be the acceleration due to gravity.

[0102] Since the ship's width B, length L, draft T, speed V, channel width b, channel depth h, channel length l, water density ρ, and gravitational acceleration g are independent of each other, the relationships between the factors affecting the ship's wave height can be constructed using the π theorem to create a dimensionless set of parameters, thus simplifying the original multivariate relationships into dimensionless functional forms:

[0103] ;

[0104] in, , , , As the impact factor, The ratio reflecting the underwater portion of a ship to the depth of the water. Reflects the degree of horizontal restriction on the channel. It reflects the matching relationship between channel length and ship dimensions. The Froude number measures the ratio of a ship's speed to the wave speed in shallow water and is an indicator of whether a ship's wave has entered a nonlinear solitary wave pattern.

[0105] After obtaining the dimensionless functional relationship, this invention establishes a maximum wave height regression model based on the influencing factors affecting the maximum wave height of ship waves, with the following formula:

[0106] ;

[0107] in, The maximum wave height of the ship traveling at the closed end of the ship lift chamber. For Froude number, Because the canal is deep, For the ship's draft, For channel width, For the ship's width, For channel length, For the length of the ship, The constant coefficients, for The exponential coefficient, for The exponential coefficient, for The coefficient of the power of , for The exponential coefficient.

[0108] To solve the maximum wave height regression model, this invention conducted simulation experiments to explore the influence of independent variables on the maximum wave height in the maximum wave height regression model. The simulation environment adopted... Figure 1 The arrangement method.

[0109] In the simulation data acquisition module, ship simulation data and intermediate channel simulation data are collected in the ship's travel path according to the ship's acquisition parameters and intermediate channel acquisition parameters. Simulation data of the maximum speed of the ship during stable navigation in the intermediate channel and simulation data of the maximum wave height of the ship's traveling wave at the closed end of the ship lift are also collected to form a water surface wave height simulation dataset.

[0110] To investigate the relationship between the maximum wave height of the ship's traveling wave at the closed end of a ship lift with a central channel and the Froude number, this invention constructs a set of generalized numerical simulation experiments. Under the premise of fixed channel water depth h, channel length l, channel width b, and ship dimensions (L, B, T), only the ship's speed V is changed to influence the Froude number. Single-variable control was performed, with different Froude numbers as the independent variable on the x-axis and the ratio of the maximum wave height of the ship traveling at the closed end of the ship lift in the intermediate channel to the channel water depth as the y-axis, and a curve was plotted to obtain the results. Figure 2 It can be seen that as the Froude number increases, the maximum wave height of the ship traveling at the closed end of the ship lift with intermediate channel also increases. Further analysis reveals that as the section coefficient n (obtained by multiplying h / T and b / B) decreases, the trend of the maximum wave height increasing with ship speed becomes more pronounced.

[0111] To study the relationship between the maximum wave height of the ship's traveling wave at the closed end of the ship lift with a central channel and the section coefficient n, this invention uses a fixed Froude number. Given the channel length l, ship length L, channel depth h, and ship draft T, a curve is plotted with the ratio of channel width to ship width as the x-axis and the ratio of the maximum wave height of the ship at the closed end of the ship lift in the middle channel to the channel depth as the y-axis. Figure 3 ;

[0112] With a fixed Froude number Given the channel length l, ship length L, channel width b, and ship width B, plot a curve with the ratio of channel depth h to ship draft T as the x-axis and the ratio of the maximum wave height of the ship at the closed end of the intermediate channel ship lift to the channel depth as the y-axis. Figure 4 ;

[0113] from Figure 3 and Figure 4 It can be seen that the maximum wave height decreases as the beam ratio b / B and water depth ratio h / T increase. Further analysis reveals that as the ship speed V increases, the decreasing trend of maximum wave height with increasing beam ratio b / B and water depth ratio h / T becomes more pronounced, and h / T has a greater influence than b / B among the section coefficients.

[0114] Because the ship length is fixed, in order to study the relationship between the maximum wave height of the ship's traveling wave at the closed end of the ship lift with intermediate channel and the channel length, this invention uses a fixed Froude number. Given the ship length L, channel water depth h, channel width b, and ship width B, with the channel-to-ship length ratio l / L as the abscissa and the ratio of the maximum wave height of the ship traveling at the closed end of the intermediate channel ship lift to the channel water depth as the ordinate, a curve is plotted when the section coefficient n is 1.88. Figure 5 When the section coefficient n is 2.25, the curve obtained is... Figure 6 ,;from Figure 5 and Figure 6 It can be seen that when the ship speed V is less than 1.5 m / s, the trend of water surface wave height in the middle channel is not obvious with the increase of channel length; when the ship speed V is greater than 1.5 m / s, the water surface wave height in the middle channel increases with the increase of channel length.

[0115] In the fitting module, based on simulated ship data, intermediate channel data, maximum speed data, and maximum wave height data, the maximum wave height regression model is substituted into the data. Combining the influence of each factor on the maximum wave height, the least squares method is used to fit the maximum wave height regression model. The constant coefficients and exponential coefficients of the maximum wave height regression model that satisfy the simulated data are then solved to obtain the fitted maximum wave height regression model.

[0116] ;

[0117] The data from the simulated water surface wave height dataset are substituted into the fitted maximum wave height regression model calculation formula and compared with the simulated maximum wave height data. Figure 7 .from Figure 7 It can be observed that the simulated data fits the maximum wave height regression model quite well. Therefore, in a combined ship lift arrangement with an intermediate channel, the parameters ship width B, ship length L, ship draft T, ship speed V, channel width b, channel depth h, and channel length l can be substituted into the maximum wave height regression model to calculate the maximum wave height of the ship's traveling wave at the closed end of the ship lift chamber.

[0118] In the calculation module, the current ship parameters, intermediate channel parameters, and the maximum speed at which the ship is stably sailing in the intermediate channel are collected and substituted into the fitted maximum wave height regression model to calculate the maximum wave height of the ship's traveling wave at the closed end of the ship lift chamber.

Claims

1. A method for calculating the maximum wave height of a ship traveling at the closed end of a ship lift with an intermediate channel, characterized in that, include: The ship's route is determined to be that it exits from the first-stage ship lift cabin and enters the second-stage ship lift cabin through the intermediate channel. Determine the data collection parameters for the ship and the intermediate channel, and establish a maximum wave height regression model; Based on the data collection parameters of the ship and the intermediate channel, ship simulation data and intermediate channel simulation data are collected along the ship's travel path. Ship speed simulation data and maximum wave height simulation data of the ship traveling at the closed end of the ship lift are also collected. The ship simulation data, intermediate channel simulation data, maximum speed simulation data, and maximum wave height simulation data are combined to form a water surface wave height simulation dataset. Based on the simulated water surface wave height dataset, a maximum wave height regression model is fitted, and the coefficients of the maximum wave height regression model that satisfy the simulated data are solved. Collect current ship parameters, intermediate channel parameters, and the maximum speed at which the ship is stably sailing in the intermediate channel. Substitute these into the fitted maximum wave height regression model to calculate the maximum wave height of the ship's traveling wave at the closed end of the ship lift chamber.

2. The method for calculating the maximum wave height of a ship traveling at the closed end of a ship lift with an intermediate channel as described in claim 1, characterized in that, The parameters collected for the vessel include the vessel's width, length, and draft; the parameters collected for the intermediate channel include the channel width, length, and depth.

3. The method for calculating the maximum wave height of a ship traveling at the closed end of a ship lift with an intermediate channel as described in claim 2, characterized in that, The establishment of the maximum wave height regression model includes: We construct a dimensionless set of factors affecting the maximum wave height of a ship's sailing waves using the π theorem, and establish a dimensionless function with the following formula: ； in, The maximum wave height of the ship traveling at the closed end of the ship lift chamber. Because the canal is deep, For the ship's draft, For channel width, For the ship's width, For channel length, Where V is the ship's length, V is the ship's speed, and g is the acceleration due to gravity. A maximum wave height regression model is constructed based on a dimensionless function, and the formula is as follows: ； in, For Froude number, The constant coefficients, for The exponential coefficient, for The exponential coefficient, for The exponential coefficient, for The exponential coefficient; The Froude number is calculated using the formula: ； Where V is the ship's speed. Let g be the water depth in the channel, and g be the acceleration due to gravity.

4. The method for calculating the maximum wave height of a ship traveling at the closed end of a ship lift with an intermediate channel as described in claim 3, characterized in that, The fitted maximum wave height regression model is obtained by performing multiple linear regression using the least squares method to solve for the coefficients in the maximum wave height regression model.

5. A system for calculating the maximum wave height of a ship traveling at the closed end of a ship lift with an intermediate channel, characterized in that, include: The path module is used to determine the ship's travel path, which is to exit the first-stage ship lift cabin and enter the second-stage ship lift cabin through the intermediate channel. The parameter model module is used to determine the data collection parameters for ships and intermediate channels, and to establish a maximum wave height regression model. The simulation data acquisition module is used to collect ship simulation data and intermediate channel simulation data in the ship's travel path according to the ship's acquisition parameters and intermediate channel acquisition parameters, and to collect ship speed simulation data and maximum wave height simulation data of the ship's traveling wave at the closed end of the ship lift chamber. The ship simulation data, intermediate channel simulation data, maximum speed simulation data, and maximum wave height simulation data are combined into a water surface wave height simulation dataset. The fitting module is used to fit the maximum wave height regression model based on the simulated water surface wave height dataset and solve for the coefficients of the maximum wave height regression model that satisfy the simulated data. The calculation module is used to collect current ship parameters, intermediate channel parameters, and the maximum speed at which the ship can sail stably in the intermediate channel. These parameters are then substituted into the fitted maximum wave height regression model to calculate the maximum wave height of the ship's traveling wave at the closed end of the ship lift chamber.

6. The maximum wave height calculation system for the closed end of the ship's traveling wave in a ship lift with an intermediate channel as described in claim 5, characterized in that, In the parameter model module, the parameters collected for the ship include the ship's width, ship's length, and ship's draft; the parameters collected for the intermediate channel include the channel width, channel length, and channel water depth.

7. The maximum wave height calculation system for the closed end of the ship's traveling wave in a ship lift with an intermediate channel as described in claim 6, characterized in that, In the parameter model module, establishing the maximum wave height regression model includes: We construct a dimensionless set of factors affecting the maximum wave height of a ship's sailing waves using the π theorem, and establish a dimensionless function with the following formula: ； in, The maximum wave height of the ship traveling at the closed end of the ship lift chamber. Because the canal is deep, For the ship's draft, For channel width, For the ship's width, For channel length, Where V is the ship's length, V is the ship's speed, and g is the acceleration due to gravity. A maximum wave height regression model is constructed based on a dimensionless function, and the formula is as follows: ； in, For Froude number, The constant coefficients, for The exponential coefficient, for The exponential coefficient, for The exponential coefficient, for The exponential coefficient; The Froude number is calculated using the formula: ； Where V is the ship's speed. Let g be the water depth in the channel, and g be the acceleration due to gravity.

8. The maximum wave height calculation system for the closed end of the ship's traveling wave in a ship lift with an intermediate channel as described in claim 7, characterized in that, In the fitting module, the fitting maximum wave height regression model is obtained by performing multiple linear regression using the least squares method to solve for the coefficients in the maximum wave height regression model.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 4.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 4.

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