A method for simulating the swaying motion of a damaged ship with water inflow

Abstract

The present invention relates to the field of ship sway simulation, and in particular to a method for simulating the swaying motion posture of a damaged ship with water inflow, comprising: obtaining the actual swaying spectrum of the damaged ship with water inflow; completing the swaying of the simulated cabin; outputting the simulated swaying spectrum according to the swaying of the simulated cabin; obtaining the spectral line coincidence between the actual swaying spectrum and the simulated swaying spectrum; determining the qualification of the simulated swaying spectrum based on the comparison between the spectral line coincidence and the preset spectral line coincidence; determining the reasons for the unqualified simulated swaying spectrum and the adjustment strategy; preliminarily determining whether the simulation meets the preset standard based on the comparison between the adjusted simulated swaying spectrum and the actual swaying spectrum, and determining again whether the simulation meets the preset standard based on the uniformity; determining the optimization mode of the swaying test platform based on the average value of the difference between the offset angle on the adjusted simulated swaying spectrum and the offset angle on the actual swaying spectrum. The accuracy and reliability of the swaying motion posture simulation of the damaged ship with water inflow are improved.

Description

Technical Field

[0001] The invention relates to the field of ship sway simulation, and in particular to a method for simulating the swaying motion posture of a damaged and flooded ship. Background Art

[0002] Complex motion simulation test platforms are increasingly used in the fields of aviation, aerospace, navigation, and automobiles, providing a simulated motion test environment for various equipment in vehicles. Among them, the simulated sway test platform, as a motion simulation test platform for simulating sea wave environments, is widely used in land-based simulation tests of ship navigation, electromechanical, and electronic equipment. The sway platform can reproduce the swaying motion of a ship under different sea conditions based on the input sway spectrum.

[0003] Chinese Patent Publication No.: CN107796615B. A sway test platform is disclosed, including a platform base, a main shaft is vertically arranged on the platform base, a rotating sleeve is externally sleeved on the main shaft, the upper end of the rotating sleeve is rotatably connected to the platform top frame, a short cantilever and a plurality of long cantilevers are arranged on the outer side of the rotating sleeve, the ends of the short cantilever and the long cantilever are in contact with the bottom of the platform top frame, the ends of the short cantilever and the long cantilever are at different vertical distances from the platform base, a variable frequency motor is arranged on one side of the platform base, and the variable frequency motor is connected to the rotating sleeve through a connecting mechanism. It can be seen that the technical solution lacks the necessary monitoring means, resulting in low simulation accuracy of the swaying motion posture of a damaged ship with water inflow. Summary of the invention

[0004] To this end, the present invention provides a method for simulating the swaying motion posture of a damaged ship with water inflow, so as to overcome the problem in the prior art that the simulation accuracy of the swaying motion posture of a damaged ship with water inflow is low due to the lack of necessary monitoring means.

[0005] To achieve the above object, the present invention provides a method for simulating the swaying motion posture of a damaged and flooded ship, comprising:

[0006] Step S1, obtaining the actual swaying spectrum of the damaged ship and water ingress;

[0007] Step S2, building a sway test platform, setting sway simulation parameters and completing the sway of the simulated cabin;

[0008] Step S3, outputting a simulated sway spectrum based on the angular attitude data of the simulated cabin sway;

[0009] Step S4, obtaining the spectral line coincidence degree between the actual swing spectral line and the simulated swing spectral line;

[0010] Step S5, determining the eligibility of the simulated swinging spectral line based on a comparison between the spectral line coincidence and a preset spectral line coincidence, wherein the preset spectral line coincidence includes a first preset spectral line coincidence and a second preset spectral line coincidence;

[0011] Step S6, when it is determined that the simulated swing spectrum is unqualified, determining the cause of the unqualified and the corresponding adjustment strategy;

[0012] Step S7, when it is preliminarily determined that the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard based on the comparison between the adjusted simulated swaying spectrum and the actual swaying spectrum, it is again determined whether the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard based on the uniformity of the simulated swaying spectrum within the preset time length;

[0013] Step S8, when it is preliminarily determined that the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard, the optimization method of the swaying test platform is determined according to the average value of the difference between the offset angles at several points on the adjusted simulated swaying spectrum and the offset angles at corresponding points on the actual swaying spectrum.

[0014] Furthermore, the swing test platform comprises:

[0015] A simulated cabin, which is a ship-shaped cabin;

[0016] A basic support, connected to the simulation cabin, for supporting the simulation cabin;

[0017] A swivel portion, which is used for swivel connection between the simulation cabin and the basic support, comprising a first movable seat connected to the end surface of the simulation cabin, and a second movable seat connected to the basic support, wherein the first movable seat and the second movable seat are connected via a swivel pin;

[0018] A hydraulic cylinder, which is used to drive the cabin to swing, one end of the hydraulic cylinder is connected to the base support, and the other end of the hydraulic cylinder is connected to the end surface of the simulated cabin;

[0019] A drive system connected to the hydraulic cylinder, comprising a pump station for pumping high-pressure hydraulic oil, and a servo valve connected to the pump station for controlling the flow of the hydraulic oil, wherein an output end of the servo valve is connected to the hydraulic cylinder;

[0020] A support base, which is used to assist in supporting the simulated cabin, including a support wheel connected to the bottom surface of the simulated cabin for supporting the simulated cabin, and a fixing seat connected to the support wheel for fixing the support wheel;

[0021] A data acquisition module, connected to the simulation cabin, for acquiring angular attitude data of the simulation cabin;

[0022] A data processing module, connected to the data acquisition module, for drawing simulated swing spectrum lines;

[0023] A control module is connected to the data acquisition module and the drive system respectively, and is used to determine the eligibility of the simulated swaying spectrum, and to determine whether the simulation of the swaying motion posture of a damaged and flooded ship meets the preset standards.

[0024] Furthermore, the process of determining the eligibility of the simulated swing spectral line based on the comparison between the spectral line coincidence degree and the preset spectral line coincidence degree includes:

[0025] Comparing the spectral line coincidence with the first preset spectral line coincidence and the second preset spectral line coincidence respectively;

[0026] If the spectral line coincidence is less than the first preset spectral line coincidence, it is determined that the simulated swing spectrum is unqualified and the reason for the unqualified is that the angular displacement of the simulated cabin is not up to standard, and the advance time of the servo valve opening signal is determined according to the difference between the first preset spectral line coincidence and the spectral line coincidence;

[0027] If the spectral line coincidence is greater than or equal to the first preset spectral line coincidence and less than the second preset spectral line coincidence, it is determined that the simulated swing spectrum is unqualified and the reason for the unqualified is that the angular velocity of the simulated cabin does not meet the standard, and the opening speed of the servo valve is increased according to the difference between the spectral line coincidence and the first preset spectral line coincidence;

[0028] If the spectral line coincidence degree is greater than or equal to the second preset spectral line coincidence degree, it is determined that the simulated swing spectral line is qualified and the simulated swing spectral line is output.

[0029] Further, the opening speed of the servo valve is increased according to the difference between the spectral line coincidence and the first preset spectral line coincidence, wherein:

[0030] If the overlap difference is less than the first preset overlap difference, increasing the opening speed of the servo valve to a corresponding value using a first preset speed adjustment coefficient;

[0031] If the overlap difference is greater than or equal to the first preset overlap difference and less than the second preset overlap difference, increasing the opening speed of the servo valve to a corresponding value using a second preset speed adjustment coefficient;

[0032] If the overlap difference is greater than or equal to the second preset overlap difference, increasing the opening speed of the servo valve to a corresponding value using a third preset speed adjustment coefficient;

[0033] The coincidence difference is the difference between the spectral line coincidence and the first preset spectral line coincidence.

[0034] Further, under the first preset condition, it is preliminarily determined whether the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard according to the comparison between the adjusted simulated swaying spectrum and the actual swaying spectrum, wherein:

[0035] If the simulated swaying spectrum after adjustment approaches the actual swaying spectrum, it is preliminarily determined that the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard, and whether the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard is determined again according to the uniformity of the simulated swaying spectrum within the preset time length;

[0036] If the adjusted simulated swaying spectrum is far away from the actual swaying spectrum, it is preliminarily determined that the simulation of the swaying motion posture of the damaged and flooded ship does not meet the preset standard, and the optimization method of the swaying test platform is determined according to the average value of the difference between the offset angles of several points on the adjusted simulated swaying spectrum and the offset angles of the corresponding points on the actual swaying spectrum;

[0037] The first preset condition is that the opening speed of the servo valve is adjusted and the adjusted simulated swing spectrum is obtained according to the adjusted opening speed of the servo valve.

[0038] Furthermore, the optimization mode of the rocking test platform is determined according to the average value of the difference of the offset angles, wherein:

[0039] If the average value of the difference of the offset angles is less than or equal to a preset average value threshold, then correcting the opening speed of the servo valve;

[0040] If the average value of the difference in the offset angles is greater than the preset average value threshold, the initial position offset of the simulation cabin is reduced.

[0041] Further, the correction amplitude of the opening speed of the servo valve is positively correlated with the correction difference, wherein the correction difference is the difference between the preset average value threshold and the average value of the difference of the offset angle.

[0042] Further, it is determined again whether the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard according to the uniformity of the simulated swaying spectrum within the preset time length, wherein:

[0043] If the uniformity is less than a preset uniformity threshold, it is determined that the simulation of the swaying motion posture of the damaged ship does not meet the preset standard, and the advance time of the servo valve opening signal is corrected according to the difference between the preset uniformity threshold and the uniformity;

[0044] If the uniformity is greater than or equal to the preset uniformity threshold, it is determined that the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard.

[0045] Furthermore, the uniformity of the simulated swing spectrum line is determined based on the dispersion of the offset peak value on the simulated swing spectrum line within a preset time length.

[0046] Furthermore, several correction methods are provided for correcting the advance time length of the servo valve opening signal, and each correction method has a different correction amplitude for the advance time length of the servo valve opening signal.

[0047] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention compares the collected simulated swing spectrum with the actual swing spectrum of the damaged and water-influent ship, and judges the qualification of the simulated swing spectrum according to the overlap of the comparison, and optimizes the operating parameters of the swing test platform accordingly when it is determined that the accuracy of the simulated swing spectrum is insufficient, thereby improving the simulation accuracy of the swing motion posture of the damaged and water-influent ship.

[0048] Furthermore, the swing test platform of the present invention is equipped with a data acquisition module, a data processing module and a control module, so as to collect the angular posture data of the simulation cabin to precisely verify the reliability of the simulation, thereby quickly and accurately correcting the operating parameters of the swing test platform, thereby improving the simulation effect of the platform.

[0049] Furthermore, the present invention determines the qualification of the simulated swing spectrum based on the comparison between the spectrum coincidence and the preset spectrum coincidence, effectively identifies the problem of angular displacement or angular velocity not meeting the standard, and determines the advance time or opening speed of the servo valve opening signal according to the comparison result, thereby accurately judging the accuracy of the simulation result.

[0050] Furthermore, the present invention increases the opening speed of the servo valve according to the difference between the spectral line coincidence and the first preset spectral line coincidence, and adopts different speed adjustment coefficients to ensure the accuracy and reliability of the simulated swing.

[0051] Furthermore, under the first preset condition, it is preliminarily determined whether the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard based on the comparison between the adjusted simulated swaying spectrum and the actual swaying spectrum. This method effectively improves the test efficiency and simulation accuracy.

[0052] Furthermore, the optimization mode of the swing test platform is determined according to the average value of the difference of the offset angles, and the posture of the damaged ship and the flooding is accurately simulated, thereby enhancing the reliability of the test.

[0053] Furthermore, the present invention determines again whether the simulation of the swaying motion posture of the damaged ship meets the preset standard according to the uniformity of the simulated swaying spectrum within the preset time length, and optimizes the simulation process by correcting the advance time length of the servo valve opening signal to improve the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1This is a flow chart of a method for simulating the swaying motion posture of a damaged and flooded ship according to an embodiment of the present invention;

[0055] Figure 2 This is a structural schematic diagram of a swing test platform according to an embodiment of the present invention;

[0056] Figure 3 A flowchart of a process for determining the eligibility of the simulated wobble line according to an embodiment of the present invention;

[0057] Figure 4 A flow chart of increasing the opening speed of the servo valve according to an embodiment of the present invention;

[0058] Figure 5 Simulating a swing spectrum for an embodiment of the invention;

[0059] Figure 2 In the figure, 1. simulation cabin; 2. basic bracket; 3. rotating part; 301. first movable seat; 302. second movable seat; 303. rotating pin; 4. hydraulic cylinder; 5. supporting base; 501. supporting wheel; 502. fixed seat. DETAILED DESCRIPTION

[0060] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0061] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0062] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0063] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] See also Figure 1-Figure 5As shown, Figure 1 This is a flow chart of a method for simulating the swaying motion posture of a damaged and flooded ship according to an embodiment of the present invention; Figure 2 This is a structural schematic diagram of a swing test platform according to an embodiment of the present invention; Figure 3 A flowchart of a process for determining the eligibility of the simulated wobble line according to an embodiment of the present invention; Figure 4 A flow chart of increasing the opening speed of the servo valve according to an embodiment of the present invention; Figure 5 Simulated rocking spectrum for an embodiment of the invention.

[0065] The method for simulating the swaying motion posture of a damaged and flooded ship according to an embodiment of the present invention comprises:

[0066] Step S1, obtaining the actual swaying spectrum of the damaged ship and water ingress;

[0067] Step S2, building a sway test platform, setting sway simulation parameters and completing the sway of the simulated cabin;

[0068] Step S3, outputting a simulated sway spectrum based on the angular attitude data of the simulated cabin sway;

[0069] Step S4, obtaining the spectral line coincidence degree between the actual swing spectral line and the simulated swing spectral line;

[0070] Step S5, determining the eligibility of the simulated swinging spectral line based on a comparison between the spectral line coincidence and a preset spectral line coincidence, wherein the preset spectral line coincidence includes a first preset spectral line coincidence and a second preset spectral line coincidence;

[0071] Step S6, when it is determined that the simulated swing spectrum is unqualified, determining the cause of the unqualified and the corresponding adjustment strategy;

[0072] Step S7, when it is preliminarily determined that the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard based on the comparison between the adjusted simulated swaying spectrum and the actual swaying spectrum, it is again determined whether the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard based on the uniformity of the simulated swaying spectrum within the preset time length;

[0073] Step S8, when it is preliminarily determined that the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard, the optimization method of the swaying test platform is determined according to the average value of the difference between the offset angles at several points on the adjusted simulated swaying spectrum and the offset angles at corresponding points on the actual swaying spectrum.

[0074] Specifically, the swing test platform includes:

[0075] A simulated cabin, which is a ship-shaped cabin;

[0076] A basic support, connected to the simulation cabin, for supporting the simulation cabin;

[0077] A swivel portion, which is used for swivel connection between the simulation cabin and the basic support, comprising a first movable seat connected to the end surface of the simulation cabin, and a second movable seat connected to the basic support, wherein the first movable seat and the second movable seat are connected via a swivel pin;

[0078] A hydraulic cylinder, which is used to drive the cabin to swing, one end of the hydraulic cylinder is connected to the base support, and the other end of the hydraulic cylinder is connected to the end surface of the simulated cabin;

[0079] A drive system connected to the hydraulic cylinder, comprising a pump station for pumping high-pressure hydraulic oil, and a servo valve connected to the pump station for controlling the flow of the hydraulic oil, wherein an output end of the servo valve is connected to the hydraulic cylinder;

[0080] A support base, which is used to assist in supporting the simulated cabin, including a support wheel connected to the bottom surface of the simulated cabin for supporting the simulated cabin, and a fixing seat connected to the support wheel for fixing the support wheel;

[0081] A data acquisition module, connected to the simulation cabin, for acquiring angular attitude data of the simulation cabin;

[0082] A data processing module, connected to the data acquisition module, for drawing simulated swing spectrum lines;

[0083] A control module is connected to the data acquisition module and the drive system respectively, and is used to determine the eligibility of the simulated swaying spectrum, and to determine whether the simulation of the swaying motion posture of a damaged and flooded ship meets the preset standards.

[0084] Specifically, the swing test platform is composed of a simulation cabin, a hydraulic cylinder, a servo valve, a PLC programmable controller, a computer system, a servo amplifier, an angle sensor, etc.

[0085] Specifically, the movement of the simulated cabin is driven by servo hydraulic cylinders located on both sides of the rotation axis. The ends of the hydraulic cylinders are connected to the cabin and the support seat through ball joints. The extension and retraction of the hydraulic cylinders drive the cabin to swing. The extension and retraction displacement and speed of the hydraulic cylinders determine the angular displacement and angular velocity of the swinging motion.

[0086] Specifically, the telescopic movement of the hydraulic cylinder is controlled by an electro-hydraulic servo valve. The switching direction of the servo valve determines the extension or retraction of the hydraulic cylinder, while the actual opening of the valve determines the telescopic speed of the hydraulic cylinder.

[0087] Specifically, the switching direction and opening degree of the electro-hydraulic servo valve are controlled by the electrical signal sent by the servo amplifier.

[0088] Specifically, the process of determining the eligibility of the simulated swinging spectrum based on the comparison of the spectrum line coincidence with the preset spectrum line coincidence is to compare the spectrum line coincidence with the first preset spectrum line coincidence of 80% and the second preset spectrum line coincidence of 95% respectively;

[0089] If the spectral line overlap is less than 80% of the first preset spectral line overlap, it is determined that the simulated swing spectrum is unqualified and the reason for the unqualified is that the angular displacement of the simulated cabin is not up to standard, and the advance time of the servo valve opening signal is determined according to the difference between the first preset spectral line overlap and the spectral line overlap;

[0090] If the spectral line coincidence is greater than or equal to the first preset spectral line coincidence and less than 95% of the second preset spectral line coincidence, it is determined that the simulated swing spectrum is unqualified and the reason for the unqualified is that the angular velocity of the simulated cabin does not meet the standard, and the opening speed of the servo valve is increased according to the difference between the spectral line coincidence and the first preset spectral line coincidence;

[0091] If the spectral line coincidence degree is greater than or equal to the second preset spectral line coincidence degree, it is determined that the simulated swing spectral line is qualified and the simulated swing spectral line is output.

[0092] Specifically, the opening speed of the servo valve is increased according to the difference between the spectral line coincidence degree and the first preset spectral line coincidence degree, wherein:

[0093] If the overlap difference is less than the first preset overlap difference of 5%, the opening speed of the servo valve is increased to a corresponding value using the first preset speed adjustment coefficient of 1.09;

[0094] If the overlap difference is greater than or equal to the first preset overlap difference of 5% and less than the second preset overlap difference of 10%, the opening speed of the servo valve is increased to a corresponding value using the second preset speed adjustment coefficient of 1.06;

[0095] If the overlap difference is greater than or equal to the second preset overlap difference, the opening speed of the servo valve is increased to a corresponding value using a third preset speed adjustment coefficient of 1.02;

[0096] The overlap difference is the difference between the spectrum line overlap and the first preset spectrum line overlap of 80%.

[0097] Specifically, under the first preset condition, it is preliminarily determined whether the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard by comparing the adjusted simulated swaying spectrum with the actual swaying spectrum, wherein:

[0098] If the simulated swaying spectrum after adjustment approaches the actual swaying spectrum, it is preliminarily determined that the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard, and whether the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard is determined again according to the uniformity of the simulated swaying spectrum within the preset time length;

[0099] If the adjusted simulated swaying spectrum is far away from the actual swaying spectrum, it is preliminarily determined that the simulation of the swaying motion posture of the damaged and flooded ship does not meet the preset standard, and the optimization method of the swaying test platform is determined according to the average value of the difference between the offset angles of several points on the adjusted simulated swaying spectrum and the offset angles of the corresponding points on the actual swaying spectrum;

[0100] The first preset condition is that the opening speed of the servo valve is adjusted and the adjusted simulated swing spectrum is obtained according to the adjusted opening speed of the servo valve.

[0101] Specifically, the optimization mode of the rocking test platform is determined according to the average value of the difference of the offset angles, wherein:

[0102] If the average value of the difference in the offset angles is less than or equal to a preset average value threshold of 3°, then correcting the opening speed of the servo valve;

[0103] If the average value of the difference in the offset angles is greater than the preset average value threshold, the initial position offset of the simulation cabin is reduced.

[0104] Specifically, the correction amplitude of the opening speed of the servo valve is positively correlated with the correction difference, wherein the correction difference is the difference between the preset average value threshold and the average value of the difference of the offset angle.

[0105] Specifically, whether the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard is determined again according to the uniformity of the simulated swaying spectrum within the preset time length, wherein:

[0106] If the uniformity is less than the preset uniformity threshold of 0.5, it is determined that the simulation of the swaying motion posture of the damaged ship does not meet the preset standard, and the advance time of the servo valve opening signal is corrected according to the difference between the preset uniformity threshold and the uniformity;

[0107] If the uniformity is greater than or equal to the preset uniformity threshold, it is determined that the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard.

[0108] Specifically, the uniformity of the simulated swing spectrum line is determined based on the dispersion of the offset peak value on the simulated swing spectrum line within a preset time length.

[0109] Specifically, there are several correction methods for correcting the advance time length of the servo valve opening signal, and each correction method has a different correction amplitude for the advance time length of the servo valve opening signal.

[0110] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0111] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for simulating the swaying motion of a damaged ship with water ingress, characterized in that: include: Step S1, obtaining the actual swaying spectrum of the damaged ship and water ingress; Step S2, building a sway test platform, setting sway simulation parameters and completing the sway of the simulated cabin; Step S3, outputting a simulated sway spectrum based on the angular attitude data of the simulated cabin sway; Step S4, obtaining the spectral line coincidence degree between the actual swing spectral line and the simulated swing spectral line; Step S5, determining the eligibility of the simulated swinging spectral line based on a comparison between the spectral line coincidence and a preset spectral line coincidence, wherein the preset spectral line coincidence includes a first preset spectral line coincidence and a second preset spectral line coincidence; Comparing the spectral line coincidence with the first preset spectral line coincidence and the second preset spectral line coincidence respectively; If the spectral line coincidence is less than the first preset spectral line coincidence, it is determined that the simulated swing spectrum is unqualified and the reason for the unqualified is that the angular displacement of the simulated cabin is not up to standard, and the advance time of the servo valve opening signal is determined according to the difference between the first preset spectral line coincidence and the spectral line coincidence; If the spectral line coincidence is greater than or equal to the first preset spectral line coincidence and less than the second preset spectral line coincidence, it is determined that the simulated swing spectrum is unqualified and the reason for the unqualified is that the angular velocity of the simulated cabin does not meet the standard, and the opening speed of the servo valve is increased according to the difference between the spectral line coincidence and the first preset spectral line coincidence; If the spectral line coincidence degree is greater than or equal to the second preset spectral line coincidence degree, determining that the simulated swing spectral line is qualified and outputting the simulated swing spectral line; Step S6, when it is determined that the simulated swing spectrum is unqualified, determining the cause of the unqualified and the corresponding adjustment strategy; The opening speed of the servo valve is increased according to the difference between the spectral line coincidence degree and the first preset spectral line coincidence degree, wherein: If the overlap difference is less than the first preset overlap difference, increasing the opening speed of the servo valve to a corresponding value using a first preset speed adjustment coefficient; If the overlap difference is greater than or equal to the first preset overlap difference and less than the second preset overlap difference, increasing the opening speed of the servo valve to a corresponding value using a second preset speed adjustment coefficient; If the overlap difference is greater than or equal to the second preset overlap difference, increasing the opening speed of the servo valve to a corresponding value using a third preset speed adjustment coefficient; The coincidence difference is the difference between the spectral line coincidence and the first preset spectral line coincidence; Step S7, when it is preliminarily determined that the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard based on the comparison between the adjusted simulated swaying spectrum and the actual swaying spectrum, it is again determined whether the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard based on the uniformity of the simulated swaying spectrum within the preset time length; Step S8, when it is preliminarily determined that the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard, the optimization method of the swaying test platform is determined according to the average value of the difference between the offset angles at several points on the adjusted simulated swaying spectrum and the offset angles at corresponding points on the actual swaying spectrum.

2. The method for simulating the swaying motion of a damaged ship with water ingress according to claim 1 is characterized in that: The swing test platform comprises: A simulated cabin, which is a ship-shaped cabin; A basic support, connected to the simulation cabin, for supporting the simulation cabin; A swivel portion, which is used for swivel connection between the simulation cabin and the basic support, comprising a first movable seat connected to the end surface of the simulation cabin, and a second movable seat connected to the basic support, wherein the first movable seat and the second movable seat are connected via a swivel pin; A hydraulic cylinder, which is used to drive the cabin to swing, one end of the hydraulic cylinder is connected to the basic support, and the other end of the hydraulic cylinder is connected to the end surface of the simulated cabin; A drive system connected to the hydraulic cylinder, comprising a pump station for pumping high-pressure hydraulic oil, and a servo valve connected to the pump station for controlling the flow of the hydraulic oil, wherein an output end of the servo valve is connected to the hydraulic cylinder; A support base, which is used to assist in supporting the simulated cabin, including a support wheel connected to the bottom surface of the simulated cabin for supporting the simulated cabin, and a fixing seat connected to the support wheel for fixing the support wheel; A data acquisition module, connected to the simulation cabin, for acquiring angular attitude data of the simulation cabin; A data processing module, connected to the data acquisition module, for drawing simulated swing spectrum lines; A control module, which is connected to the data acquisition module and the drive system respectively, and is used to determine the eligibility of the simulated swaying spectrum, and to determine whether the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard; The coincidence difference is the difference between the spectral line coincidence and the first preset spectral line coincidence.

3. The method for simulating the swaying motion of a damaged ship with water inflow according to claim 2 is characterized in that: Under the first preset condition, the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard by comparing the adjusted simulated swaying spectrum with the actual swaying spectrum. If the simulated swaying spectrum after adjustment approaches the actual swaying spectrum, it is preliminarily determined that the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard, and whether the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard is determined again according to the uniformity of the simulated swaying spectrum within the preset time length; If the adjusted simulated swaying spectrum is far away from the actual swaying spectrum, it is preliminarily determined that the simulation of the swaying motion posture of the damaged and flooded ship does not meet the preset standard, and the optimization method of the swaying test platform is determined according to the average value of the difference between the offset angles of several points on the adjusted simulated swaying spectrum and the offset angles of the corresponding points on the actual swaying spectrum; The first preset condition is that the opening speed of the servo valve is adjusted and the adjusted simulated swing spectrum is obtained according to the adjusted opening speed of the servo valve.

4. The method for simulating the swaying motion of a damaged ship with water inflow according to claim 3 is characterized in that: The optimization mode of the rocking test platform is determined according to the average value of the difference of the offset angles, wherein: If the average value of the difference of the offset angles is less than or equal to a preset average value threshold, then correcting the opening speed of the servo valve; If the average value of the difference in the offset angles is greater than the preset average value threshold, the initial position offset of the simulation cabin is reduced.

5. The method for simulating the swaying motion of a damaged ship with water inflow according to claim 4 is characterized in that: The correction amplitude of the opening speed of the servo valve is positively correlated with the correction difference, wherein the correction difference is the difference between the preset average value threshold and the average value of the difference of the offset angle.

6. The method for simulating the swaying motion of a damaged ship with water inflow according to claim 5 is characterized in that: According to the uniformity of the simulated swaying spectrum within the preset time length, it is determined again whether the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard, wherein: If the uniformity is less than a preset uniformity threshold, it is determined that the simulation of the swaying motion posture of the damaged ship does not meet the preset standard, and the advance time of the servo valve opening signal is corrected according to the difference between the preset uniformity threshold and the uniformity; If the uniformity is greater than or equal to the preset uniformity threshold, it is determined that the simulation of the swaying motion posture of the damaged and flooded ship meets the preset standard.

7. The method for simulating the swaying motion of a damaged ship with water inflow according to claim 6 is characterized in that: The uniformity of the simulated swing spectrum line is determined based on the dispersion of the offset peak value on the simulated swing spectrum line within a preset time length.

8. The method for simulating the swaying motion of a damaged ship with water inflow according to claim 7 is characterized in that: There are several correction methods for correcting the advance time length of the servo valve opening signal, and each correction method has a different correction amplitude for the advance time length of the servo valve opening signal.

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