Nonlinear fender simulation device

Abstract

The invention belongs to the technical field of ships, and discloses a nonlinear fender simulation device. The nonlinear fender simulation device comprises a fixing unit and an elastic unit, the fixing unit comprises a base, a first supporting part and a second supporting part, and the first supporting part and the second supporting part are arranged at the two ends of the base at intervals in the first direction; the elastic unit comprises a rigid simulation assembly and a main rod, the main rod is rotationally arranged on the first supporting component, the first end of the main rod is used for receiving collision force, the two ends of the rigid simulation assembly are fixedly connected with the second end of the main rod and the second supporting component respectively, and the rigid simulation assembly at least comprises a first rigid rope, a first spring and a second spring. The first spring and the second spring are sequentially connected, the first rigid rope is arranged in the first spring in a penetrating mode, the head end of the first rigid rope is fixedly connected with the head end of the first spring, and the tail end of the first rigid rope is fixedly connected with the tail end of the first spring. According to the invention, the physical characteristics of the fender can be simulated, and guidance is provided for fender design.

Description

Technical Field

[0001] This invention relates to the field of marine technology, and in particular to a nonlinear fender simulation device. Background Technology

[0002] A fender, also known as a ship's guardrail, is an elastic buffer device used on the edge of a dock or ship. Fenders are widely used in various types of docks, such as inland river docks, large ports, container terminals, and tanker terminals, and are also used on the ships themselves. The main function of a fender is to reduce the impact force between the ship and the dock or between ships during berthing or mooring. Through compression deformation, it converts the ship's kinetic energy into elastic potential energy, which is then slowly released. This can reduce the impact force by 60%-80%, preventing or eliminating damage to the ship and dock. At the same time, its suitable coefficient of friction prevents the ship from slipping without excessively abrading the ship's paint.

[0003] In marine engineering pool tests of ship dock mooring models, fenders are mainly made of rubber. The typical reaction force and deformation rate have a nonlinear relationship that is not monotonically increasing. Commonly used fender simulation devices have limitations, as they are not only structurally complex, but can only simulate monotonically increasing linear stiffness. Summary of the Invention

[0004] The purpose of this invention is to provide a nonlinear fender simulation device to simulate the physical characteristics of fenders.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Nonlinear fender simulation device, including:

[0007] The fixing unit includes a base, a first support component, and a second support component, wherein the first support component and the second support component are spaced apart at both ends of the base along a first direction;

[0008] The elastic unit includes a rigid simulation component and a main rod. The main rod is rotatably mounted on the first support component. The first end of the main rod is used to receive the impact force. The two ends of the rigid simulation component are respectively fixedly connected to the second end of the main rod and the second support component. The rigid simulation component includes at least a first rigid rope, a first spring, and a second spring. The first spring and the second spring are connected in sequence. The first rigid rope passes through the first spring, and the first end of the first rigid rope is fixedly connected to the first end of the first spring, and the tail end of the first rigid rope is fixedly connected to the tail end of the first spring.

[0009] As an optional solution for the nonlinear fender simulation device, the main rod is provided with a central hole, and the first support component includes:

[0010] Two mounting side plates are spaced apart on the base along a second direction;

[0011] The support shaft has two ends connected to the two mounting side plates respectively, and the support shaft passes through the central hole. The main rod can swing relative to the support shaft.

[0012] As an alternative to the nonlinear fender simulation device, a clearance notch is provided on the base near the first support component, and the first end of the main rod passes through the clearance notch.

[0013] As an alternative to the nonlinear fender simulation device, the central hole is located at the center of symmetry of the main rod.

[0014] As an alternative to the nonlinear fender simulation device, the first end of the main rod is provided with a force-bearing protrusion.

[0015] As an alternative to the nonlinear fender simulation device, the second end of the main rod is provided with a mounting protrusion, and the mounting protrusion is provided with at least one first mounting hole.

[0016] As an optional solution for the nonlinear fender simulation device, the force-bearing protrusion is provided with at least one second mounting hole.

[0017] As an alternative to the nonlinear fender simulation device, the top of the second support component is provided with at least one third mounting hole.

[0018] As an optional solution for the nonlinear fender simulation device, the base is provided with a connection hole, through which fasteners can be connected to external fixed objects.

[0019] As an optional solution for the nonlinear fender simulation device, the rigid simulation component further includes:

[0020] The third spring, the first spring, the second spring and the third spring are connected in sequence;

[0021] A second rigid rope is threaded through both the first spring and the second spring. The first end of the second rigid rope is fixedly connected to the first end of the first spring, and the last end of the second rigid rope is fixedly connected to the last end of the second spring.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The nonlinear fender simulation device provided by this invention has a base arranged perpendicular to the collision direction according to experimental needs and fixed on a slipway or dock model. The first end of the main rod is used to receive the collision force. The main rod is rotatably mounted on a first support component. One end of the rigid simulation component is fixedly connected to a second support component, and the other end of the rigid simulation component is connected to the second end of the main rod. A first rigid rope is threaded through a first spring, with its head end fixedly connected to the head end of the first spring and its tail end fixedly connected to the tail end of the first spring. The first rigid rope is initially in a slack state. Therefore, in the initial stage, the stiffness of the rigid simulation component is the stiffness of the first and second springs connected in series. As the rigid simulation component elongates, the first rigid rope tightens, and at this time, the stiffness of the rigid simulation component becomes the stiffness of the second spring. Therefore, the stiffness of the rigid simulation component is a piecewise linear stiffness, thereby simulating the physical characteristics of the fender. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the assembly of the nonlinear fender simulation device in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the rigid simulation component in an embodiment of the present invention.

[0027] Figure label:

[0028] 1. Base; 11. Clearance notch; 2. First support component; 21. Mounting side plate; 22. Support shaft; 3. Second support component; 31. Third mounting hole; 4. Rigid simulation component; 41. First rigid rope; 42. First spring; 43. Second spring; 5. Main rod; 51. Center hole; 52. Force-bearing protrusion; 521. Second mounting hole; 53. Mounting protrusion; 531. First mounting hole. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] The main functions of fenders are multifaceted. When a ship docks or moors, due to its kinetic energy, a significant impact force is generated upon contact with the dock or another vessel. The fender, through its own compression and deformation, converts the ship's kinetic energy into its own elastic potential energy. This energy conversion process is not instantaneous but rather a slow release. In this way, the fender reduces the impact force. This significant shock absorption effectively prevents damage to both the ship and the dock. For example, without the cushioning of a fender, a ship might directly collide with the dock upon docking, causing cracks and deformation in the dock structure, affecting its normal use and safety. Simultaneously, the ship's hull may suffer dents, scratches, and other damage from the collision, increasing repair costs and time. Furthermore, fenders possess a suitable coefficient of friction. This coefficient of friction is carefully designed and adjusted to prevent the ship from slipping due to water flow, wind, or other factors during berthing, ensuring the ship is stably moored in the designated position, while also preventing excessive wear on the ship's paint due to excessive friction. Ship paint is crucial for ships; it not only protects the hull metal from corrosion but also enhances the ship's aesthetic appearance. If the friction coefficient of the fender is too high, it will frequently rub against the ship's paint during contact with the ship, causing the paint to wear off and expose the ship's metal, accelerating the corrosion of the hull and shortening the ship's service life.

[0034] In marine engineering tank-based ship dock mooring model tests, rubber is the primary material used to construct the fenders. Rubber possesses excellent elastic properties, allowing for significant deformation under external forces and rapid recovery to its original shape after the force is removed. This aligns with the fender's role in cushioning impacts. During the tests, the typical fender reaction force and deformation rate exhibited a non-monotonic, increasing relationship. This means that the reaction force and deformation of the fender under different impact forces do not change linearly according to a fixed ratio. However, currently used fender simulation devices have limitations. These devices are not only structurally complex, involving the combination and installation of multiple components, increasing the difficulty and cost of the tests; moreover, their simulated stiffness characteristics can only achieve a monotonically increasing linear stiffness simulation. In other words, these simulation devices can only simulate the reaction force and deformation relationship of the fender under stress at a fixed ratio. This limitation leads to a certain deviation between the test results and actual conditions, failing to truly reflect the fender's performance during actual ship dock mooring, thus affecting the accuracy and reliability of the tests.

[0035] To simulate the physical characteristics of fenders and provide guidance for subsequent ship and fender design, this embodiment provides a nonlinear fender simulation device, which is described below in conjunction with... Figures 1 to 2The specific content of this embodiment will be described in detail. It should be noted that the first direction mentioned in this embodiment is the X direction in the figure, and the second direction mentioned in this embodiment is the Y direction in the figure.

[0036] The nonlinear fender simulation device provided in this embodiment includes a fixed unit and an elastic unit. The fixed unit, serving as the basic support for the entire device, includes a base 1, a first support component 2, and a second support component 3. The base 1 is arranged perpendicular to the collision direction according to the specific requirements of the experiment and is securely fixed to a ship or dock model. This arrangement ensures that the device remains stable during the simulated collision, preventing swaying or displacement due to external forces, thus providing a reliable guarantee for accurately simulating the working state of the fender. The first support component 2 and the second support component 3 are spaced apart at both ends of the base 1 along a first direction. The distance between the first support component 2 and the second support component 3 provides suitable installation space and support force for the elastic unit, ensuring that the elastic unit can deform in a predetermined manner when subjected to force. The elastic unit is the core component of this simulation device. It includes a rigid simulation component 4 and a main rod 5. The main rod 5 is rotatably mounted on the first support component 2, with its first end specifically designed to receive the collision force. When an external collision force acts on the first end of the main rod 5, the main rod 5 rotates around the first support component 2, thereby transmitting the collision force to the rigid simulation component 4. The two ends of the rigid simulation component 4 are fixedly connected to the second end of the main rod 5 and the second support component 3, respectively. The rigid simulation component 4 includes at least a first rigid rope 41, a first spring 42, and a second spring 43. The first spring 42 and the second spring 43 are connected in sequence to form a series structure. This series structure can work together to exert an elastic effect in the initial stage. The first rigid rope 41 is inserted into the first spring 42, and the first end of the first rigid rope 41 is fixedly connected to the first end of the first spring 42, and the last end of the first rigid rope 41 is fixedly connected to the last end of the first spring 42. In the initial state, the first rigid rope 41 is in a slack state. At this time, the stiffness of the rigid simulation component 4 is mainly determined by the stiffness of the first spring 42 and the second spring 43 connected in series.

[0037] As the rigid simulation component 4 gradually elongates under the impact force, the first rigid rope 41 begins to tighten. Once the first rigid rope 41 is fully tightened, the first spring 42 no longer affects the stiffness of the rigid simulation component 4; at this point, the stiffness of the rigid simulation component 4 is determined solely by the stiffness of the second spring 43. Through this design, the stiffness of the rigid simulation component 4 achieves piecewise linear variation, thus accurately simulating the complex nonlinear physical characteristics of the fender in actual operation. Compared to traditional linear approximation simulation, this piecewise linear stiffness simulation method more realistically reflects the changes in the fender under different stress stages, greatly improving the accuracy and reliability of the simulation.

[0038] The nonlinear fender simulation device provided in this embodiment improves experimental reliability, ensuring the overall structure operates within its elastic range. This means that during long-term repeated testing, the device will not exhibit changes in its stiffness curve due to exceeding the elastic range, maintaining stable simulation performance and meeting the requirements for numerous repeated tests. This is significant for in-depth research on fender performance and optimization of design schemes, providing reliable data support for researchers.

[0039] The nonlinear fender simulation device provided in this embodiment also has a certain degree of scalability. In practical applications, the number and stiffness of the springs, as well as the length of the rigid rope, can be flexibly adjusted according to the characteristics of different nonlinear fenders. Through this adjustment, simulation tests can be conducted on various types of nonlinear stiffness fenders to meet the research needs in different scenarios. This scalability makes the device have broad application prospects, not only applicable to ship dock mooring model tests, but also extending to other fields that require the simulation of nonlinear elastic properties.

[0040] Currently, most simulation methods applicable to fenders are linear approximations. While these methods are computationally simple, they lead to significant experimental errors and fail to accurately reflect the actual working state of the fender. Furthermore, some nonlinear stiffness simulation methods rely on the inherent properties of the material itself, which are difficult to implement and require complex material testing and modeling processes. In contrast, the nonlinear fender simulation device provided in this embodiment simulates the actual nonlinear stiffness curve by segmenting and linearizing it. It is simple, lightweight, and highly operable. It eliminates the need for complex material testing and modeling processes; simply by selecting and configuring the number of springs, spring stiffness, and rigid rope length, it can simulate nonlinear stiffness fenders, significantly reducing the difficulty and cost of simulation and providing an efficient and practical solution for fender research and application.

[0041] Furthermore, the main rod 5 is provided with a central hole 51, and the first support component 2 includes two mounting side plates 21 and a support shaft 22. The two mounting side plates 21 are spaced apart on the base 1 along the second direction; both ends of the support shaft 22 are connected to the two mounting side plates 21 respectively, and the support shaft 22 passes through the central hole 51, allowing the main rod 5 to swing relative to the support shaft 22. In this embodiment, the swing range and angle of the main rod 5 can meet the deformation requirements of the simulated fender under different collision conditions, and will not cause damage or loss of stability to the device due to excessive swing. The mounting side plates 21 are fixed to the base 1 by a high-strength connection method, such as bolt connection, welding, etc., to ensure that the mounting side plates 21 will not loosen or shift during the operation of the device, providing a stable support foundation for the support shaft 22. In order to reduce the influence of rotational friction on the simulation experiment, bearing components can be installed at the rotational connection between the main rod 5 and the support shaft 22.

[0042] Furthermore, a clearance notch 11 is provided on the base 1 near the first support component 2, and the first end of the main rod 5 passes through the clearance notch 11. The shape of this clearance notch 11 is usually designed according to the swing trajectory of the main rod 5, and may be rectangular, arc-shaped, or other irregular shapes to ensure that it can accommodate the movement space of the main rod 5 during the swing process. The clearance notch 11 must ensure that the main rod 5 does not come into contact with the edge of the notch when swinging, and also avoid the notch being too large to affect the overall strength and stability of the base 1. When the main rod 5 is subjected to an impact force, it will swing around the support shaft 22, and the clearance notch 11 provides free space for this swing of the main rod 5, ensuring that the main rod 5 will not structurally interfere with the base 1 during the movement, thereby ensuring the stable operation of the device and improving the reliability and durability of the device. For example, during long-term repeated tests, the device can always maintain stable performance and will not malfunction or increase in error due to structural interference.

[0043] Furthermore, in this embodiment, the central hole 51 is located at the center of symmetry of the main rod 5. When the impact force acts on the main rod 5, because the central hole 51 is at the center of symmetry, the impact force can be directly applied to the rigid simulation component 4 in a 1:1 ratio. This 1:1 ratio transmission ensures that there is no additional leverage effect during the force transmission process, making the force on the rigid simulation component 4 equal to the magnitude of the impact force actually borne by the main rod 5. In this way, in the simulation test, the deformation and stress of the rigid simulation component 4 can realistically reflect the response of the fender in an actual collision, providing researchers with the most accurate and intuitive data. For example, when studying the buffering performance under different collision energies, this 1:1 force transmission method can accurately measure the displacement, stress, and other parameters of the rigid simulation component 4, thereby accurately evaluating the buffering effect of the fender and providing a reliable basis for the design and optimization of the fender. From the perspective of the stability and reliability of the device, the central hole 51 being located at the center of symmetry allows the main rod 5 to maintain a good balance when subjected to force. Under the impact force, the main rod 5 moves around the central hole 51. Due to the symmetrical distribution of the force, the bending moment and torque experienced by the main rod 5 are relatively small, reducing the possibility of bending, twisting, or other deformations. This not only helps to extend the service life of the main rod 5, but also ensures the stability and repeatability of the device during long-term operation, improving the accuracy and reliability of the test.

[0044] However, it is understandable that different experimental requirements and simulation scenarios in practical applications may have different requirements for the force transmission ratio. Therefore, in other embodiments, the central hole 51 can also be flexibly set at the asymmetry center of the main rod 5. When the central hole 51 is located at the asymmetry center, the lever principle is cleverly utilized to amplify or reduce the collision force. In the design of the main rod 5, when the central hole 51 is deviated from the symmetry center, the main rod 5 forms a lever. The distance between the position of the collision force acting on the main rod 5 and the central hole 51 constitutes the power arm, while the distance between the rigid simulation component 4 and the central hole 51 constitutes the resistance arm. According to the lever balance condition, the power multiplied by the power arm equals the resistance multiplied by the resistance arm. By reasonably designing the length ratio of the power arm and the resistance arm, the amplification or reduction of the collision force can be achieved.

[0045] When it is necessary to amplify the collision force, the rigid simulation component 4 can be positioned closer to the central hole 51, while the point of application of the collision force is farther from the central hole 51. This way, under the same collision force, the force experienced by the rigid simulation component 4 will be multiplied. This amplification effect is very useful in simulating high-energy collision scenarios, such as simulating a strong collision between a large ship and its fender. By amplifying the collision force, similar mechanical effects to actual high-energy collisions can be obtained on a smaller experimental scale, reducing experimental costs and difficulty while improving experimental safety.

[0046] Conversely, when it is necessary to reduce the impact force, the rigid simulation component 4 can be positioned further away from the central hole 51, while the point of application of the impact force is closer to the central hole 51. This reduces the force experienced by the rigid simulation component 4 accordingly. This reduction effect is significant in simulating low-energy or minor collision scenarios, such as minor collisions between small vessels and fenders or frictional collisions during daily use. By reducing the impact force, the deformation and stress on the rigid simulation component 4 under minor forces can be measured more accurately, providing detailed data support for performance studies of fenders under low-energy collisions.

[0047] Furthermore, in some application scenarios, the main rod 5 is provided with multiple center holes 51. Based on the rotatable connection between the support shaft 22 and the corresponding center hole 51, the variability of the center hole 51 position enhances the adaptability and flexibility of the device. Different fender types and specifications may have different mechanical properties and collision response requirements. By adjusting the position of the center hole 51, customized simulation tests can be conducted for different fenders, meeting diverse research needs. At the same time, this flexibility also allows the device to adapt to different test environments and conditions, improving its versatility and practicality.

[0048] Furthermore, a force-bearing protrusion 52 is provided at the first end of the main rod 5. The force-bearing protrusion 52 protrudes outward relative to the main rod 5. In actual collision simulations, if the collision force is dispersed across the main rod 5, the measurement results of these parameters will be interfered with, leading to inaccurate data. The force-bearing protrusion 52 ensures the concentrated application of the collision force, allowing the measurement data to accurately reflect the force situation of the fender in an actual collision, providing a reliable basis for the design and optimization of the fender. Secondly, precise force distribution also reduces additional wear and tear on the main rod 5. Because the collision force is concentrated on the force-bearing protrusion 52, the force on other parts of the main rod 5 is relatively small, extending the service life of the main rod 5 and reducing the maintenance cost of the device.

[0049] Furthermore, the second end of the main rod 5 is provided with a mounting protrusion 53, and the mounting protrusion 53 is provided with at least one first mounting hole 531. The first mounting hole 531 plays a crucial role when the spring needs to be connected and assembled with the main rod 5. One end of the spring can easily hook into the first mounting hole 531, a simple and quick connection method that requires no complicated tools or operating procedures. This design greatly improves assembly efficiency. In numerous simulation tests, the device needs frequent disassembly and assembly; if the connection method is complex, it will consume a lot of time and manpower. However, by hooking the spring with the first mounting hole 531, assembly and disassembly can be completed in a short time, improving the efficiency of the test. At the same time, this connection method also has good stability. The spring hooked into the first mounting hole 531 can be firmly fixed to the main rod 5, and it is not easy to fall off during the test, ensuring the normal operation of the device. In addition, the design of the first mounting hole 531 also has a certain degree of flexibility; different numbers and specifications of mounting holes can be set according to actual needs to accommodate different types and specifications of spring connections, enhancing the versatility of the device.

[0050] Furthermore, the force-bearing protrusion 52 is provided with at least one second mounting hole 521. In this embodiment, the force-bearing protrusion 52 and the mounting protrusion 53 have the same shape and can be used interchangeably, providing great flexibility in the use of the device. In actual operation, operators may accidentally install the first and second ends of the main rod 5 in reverse. Without this interchangeable design, the reversed main rod 5 may not be able to connect properly with other components or achieve the expected function, leading to the inability to conduct the test or inaccurate results. The interchangeable design of the force-bearing protrusion 52 and the mounting protrusion 53 solves this problem. Even if the first and second ends of the main rod 5 are installed in reverse, because they are identical in shape, they can be connected and assembled with other components through the corresponding mounting holes, and the device can still be used normally. This interchangeable design not only reduces the impact of operational errors on the test but also improves the fault tolerance of the device. In some situations where the test progress is critical, even if the operator installs the main rod 5 in reverse, there is no need to spend time disassembling and reassembling; the test can continue directly, saving time and costs. At the same time, this design reduces the operational burden on operators and improves work efficiency.

[0051] Furthermore, the top of the second support component 3 is provided with at least one third mounting hole 31. The third mounting hole 31 plays a crucial role when the spring needs to be connected and assembled with the second support component 3. One end of the spring can precisely hook into the third mounting hole 31, providing a highly accurate and reliable connection. From a mechanical perspective, a spring undergoes elastic deformation under stress, and the magnitude and direction of its elastic force are closely related to the position and fixing method of the connection point. By fixing the spring with the third mounting hole 31, the connection point is clearly defined, allowing the spring to transmit the elastic force in a predetermined direction and manner under stress, reducing elastic force deviations caused by unstable connections. For example, in simulating the impact force on a fender, the spring simulates the elastic buffering effect of the fender. If the spring connection is unstable, the transmission of elastic force will fluctuate, resulting in inaccurate simulated impact forces that cannot truly reflect the stress situation of the fender in an actual collision. The design of the third mounting hole 31 ensures the stability of the spring connection, enabling accurate transmission of elastic force and thus improving the accuracy of the mechanical simulation. In addition, the number of third mounting holes 31 also offers a degree of flexibility. Depending on the actual simulation requirements and the specifications of the spring, one or more third mounting holes 31 can be provided.

[0052] Furthermore, the base 1 is provided with connection holes. These holes allow fasteners to pass through and connect to external fixed objects, ensuring the device does not shake or shift during operation, thus guaranteeing the accuracy of the simulation test. The connection holes also allow for quick installation and disassembly of the device. The number of connection holes on the base 1 can be designed according to actual installation requirements (in situations with limited space or specific requirements for the installation location, the number of connection holes can be reduced to meet space constraints; while in situations requiring higher stability and load-bearing capacity, the number of connection holes can be increased, using multiple fasteners for simultaneous fixation to improve the device's stability and load-bearing capacity. For example, in simulating a high-energy collision with a large fender, to ensure the device can withstand the enormous collision force without displacement, the number of connection holes on the base 1 can be increased, using more fasteners to firmly fix the device to the test platform), without further limitations.

[0053] Furthermore, the rigid simulation component 4 also includes a third spring and a second rigid rope. The first spring 42, the second spring 43, and the third spring are connected in sequence. The second rigid rope is threaded through both the first spring 42 and the second spring 43. The first end of the second rigid rope is fixedly connected to the first end of the first spring 42, and the last end of the second rigid rope is fixedly connected to the last end of the second spring 43. By adding the third spring and the second rigid rope, the nonlinear fender simulation device can simulate three linear stiffness curves. In the first stage, both the first rigid rope 41 and the second rigid rope are in a relaxed state, and the stiffness of the rigid simulation component 4 is the stiffness of the first spring 42, the second spring 43, and the third spring connected in series. In the second stage, the first rigid rope 41 is in a taut state, and the stiffness of the rigid simulation component 4 is the stiffness of the second spring 43 and the third spring connected in series. In the third stage, the second rigid rope is also in a taut state, and the stiffness of the rigid simulation component 4 is the stiffness of the third spring.

[0054] Furthermore, similarly, the fourth spring and the third rigid rope are connected in sequence, i.e., the first spring 42, the second spring 43, the third spring and the fourth spring are connected in sequence; the third rigid rope is simultaneously passed through the first spring 42, the second spring 43 and the third spring, the first end of the third rigid rope is fixedly connected to the first end of the first spring 42, and the last end of the third rigid rope is fixedly connected to the last end of the third spring.

[0055] Understandably, the same principle applies to the (n+1)th spring and the nth rigid rope, i.e., the first spring 42, the second spring 43, the third spring, the fourth spring to the (n+1)th spring are connected in sequence; the nth rigid rope is simultaneously passed through the first spring 42, the second spring 43, the third spring, the fourth spring to the nth spring, the beginning of the nth rigid rope is fixedly connected to the beginning of the first spring 42, and the end of the nth rigid rope is fixedly connected to the end of the nth spring.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A non-linear fender simulation device, characterized by, The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit.

2. The non-linear fender simulation device of claim 1, wherein, The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit.

3. The non-linear fender simulation device of claim 2, wherein, The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit.

4. The non-linear fender simulation device of claim 2, wherein, The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit.

5. The nonlinear fender simulation device of claim 1, wherein, The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit.

6. The non-linear fender simulation device of claim 5, wherein, The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit.

7. The non-linear fender simulation device of claim 5, wherein, The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit.

8. The non-linear fender simulation device of claim 1, wherein, The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit.

9. The nonlinear fender simulation device of claim 1, wherein, The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit.

10. The non-linear fender simulation device of any of claims 1-9, wherein, The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility model relates to a fixed unit, elastic unit and a rigid simulation assembly, and the rigid simulation assembly is connected with the fixed unit and the elastic unit. The utility

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