Device and method for calibrating still water horizontal bending moment of container water elastic ship model

Abstract

The invention provides a device and method for calibrating the still water horizontal bending moment of a container water elastic ship model, and the device comprises a power transmission assembly, a measurement assembly, a supporting assembly and a positioning assembly, and is used for providing, protecting, measuring, applying, supporting and adjusting the applying process of the horizontal bending moment, so as to achieve the calibration of the horizontal bending moment of the container water elastic ship model under the still water condition. The method comprises the steps of installing the platform, sealing the power transmission assembly, installing the calibration platform, putting the ship model into water, starting a calibration test, changing a load working condition for re-calibration, processing data and the like. The size of the load is controlled through the servo motor, and the loading is stable and is not interfered by the outside; by combining the lifting support platform and the loading heads at different heights, accurate calibration of the horizontal bending moment in a bending-torsion coupling stress state can be realized. The method considers the combined influence of torque, forms a horizontal bending moment calibration matrix, and improves the accuracy of calibration data. An effective solution is provided for horizontal bending moment calibration of the container water elastic ship model under the still water condition.

Description

Technical Field

[0001] The invention relates to the technical field of ship engineering tests, in particular to a device and method for calibrating the still water horizontal bending moment of a container hydroelastic ship model. Background Art

[0002] Compared with the characteristics of conventional ships, container ship decks have larger openings. When sailing in oblique waves, the ship will be subjected to the simultaneous action of horizontal bending moment and torque loads, causing large warping deformation and warping stress in the hull structure. At the same time, high-strength steel is widely used in ship construction. In addition, the increasing speed of ships causes wave-induced vibrations in the hull structure, posing a serious threat to the strength and safety of the hull structure. When conducting experimental research on container ship models, considering the hydrodynamic restoring force under the vertical bending moment and torque loading state, the vertical bending moment and torque loads can be easily added in the test tank to achieve the static water calibration of the hull beam load of the test ship model. However, considering the current conditions of the water tank test site, it is impossible to apply stable and accurate horizontal bending moment loads to the test ship model, and thus it is impossible to provide correction data for the calibration coefficient of the horizontal bending moment of the ship model, which to a certain extent affects the accuracy of the horizontal bending moment load test data.

[0003] More importantly, the horizontal bending moment experienced by the test ship model during the test is not necessarily at the same vertical height as the ship model's shear center. This results in the ship model being subjected to both horizontal bending moment and torque loads. Therefore, to fully ensure the accuracy of the ship model's horizontal bending moment load data, it is necessary to apply the combined effects of horizontal bending moment and torque to the ship model during the ship model calibration phase. This load calibration data is then fitted and analyzed to derive the calibration matrix coefficients for the horizontal bending moment load.

[0004] To this end, we propose a device and method for calibrating the still water horizontal bending moment of a container hydroelastic ship model. Summary of the Invention

[0005] To address the shortcomings of the aforementioned existing production technologies, the applicant has provided a device and method for calibrating the hydrostatic horizontal bending moment of a containerized hydroelastic ship model. This device utilizes a servo motor and a single-component force balance to coordinate control. The servo motor provides power, and the single-component force display adjusts the servo motor's magnitude until the target value is reached. Load application is stable and unaffected by external interference. Combined with a lifting support platform and loading heads positioned at different heights on the ship model's hull, this device accurately calibrates the horizontal bending moment of a container ship under coupled bending and torsional loads.

[0006] The technical solutions adopted in the present invention are as follows:

[0007] A device for calibrating the still water horizontal bending moment of a container hydroelastic ship model, comprising:

[0008] a power transmission assembly for providing and controlling the application of horizontal bending moments;

[0009] sealing assemblies, used to protect power transmission components from environmental influences;

[0010] Measuring assembly, used to measure the value of horizontal bending moment load applied to the test ship model;

[0011] Loading assembly, used to directly apply horizontal bending moment to the test ship model;

[0012] Support assembly, used to support and adjust the position of various components of the device;

[0013] Positioning assembly, used to limit the movement of the test ship model during the calibration process and monitor the attitude of the test ship model;

[0014] Realize the calibration of the horizontal bending moment of the container hydroelastic ship model under still water conditions.

[0015] As a further improvement of the above technical solution:

[0016] In one embodiment, the power transmission assembly includes:

[0017] Servo motor, as the power source;

[0018] A worm gear, connected to the servo motor, is used to convert rotary motion into linear motion;

[0019] A horizontal shaft, one end of which is connected to the worm gear and the other end is connected to the loading assembly, is used to transmit horizontal bending moment.

[0020] In one embodiment, the sealing assembly includes:

[0021] Watertight box to seal the servo motor and worm drive to prevent moisture from entering;

[0022] Wire holes are provided on the watertight box and are used to lead out the power lines and control lines of the servo motor;

[0023] The shaft sleeve is provided on the watertight box and is used to extend the horizontal shaft rod and ensure its sealing.

[0024] In one embodiment, the measuring component includes:

[0025] One-way force balance is used to measure the horizontal bending moment load value applied by the horizontal shaft to the test ship model.

[0026] In one embodiment, the loading component includes:

[0027] The loading head is installed at the end of the horizontal shaft and is used to directly apply horizontal bending moment to the test ship model;

[0028] The load-bearing platform is installed on the port and starboard sides of the bow, midship and stern of the test ship model to withstand the horizontal bending moment applied by the loading head.

[0029] In one embodiment, the support assembly includes:

[0030] The liftable support frame is used to support components such as the watertight box, unidirectional force balance and loading head, and its height can be adjusted to ensure that all components are on the same level.

[0031] The positioning component includes:

[0032] A mooring system to limit the movement of the test ship model during calibration;

[0033] The gyroscope is used to monitor the attitude of the test ship model and ensure that the test ship model remains balanced during the calibration process.

[0034] A method for calibrating the still water horizontal bending moment of a containerized hydroelastic ship model, which uses the above-mentioned still water horizontal bending moment calibration device for the containerized hydroelastic ship model, further comprising the following steps:

[0035] S1. Install the platform installation base and force platform symmetrically on the port and starboard sides of the bow, midship and stern of the test ship model, ensuring installation accuracy to avoid affecting the buoyancy of the test ship model in still water;

[0036] S2. Seal the power transmission assembly, place the servo motor and worm gear into a watertight box, and seal it;

[0037] S3. Install the calibration platform, secure the watertight box and unidirectional force balance to the liftable support frame through the support base, and adjust the number of bolts and gaskets connecting the watertight box and unidirectional force balance to the support base and the degree of connection to ensure that the horizontal shafts are on the same horizontal line;

[0038] S4, the ship model is put into water;

[0039] S5. Start the calibration test and debug the equipment. Adjust the height of each lifting support frame so that each loading head, force-bearing platform, and horizontal shaft are in a horizontal line. Based on the load data of the one-way force balance, control the servo motor to add a series of loads to the test ship model in the order of small to large and then large to small. Repeat the load data calibration several times and record the load value of the one-way force balance and the ship model attitude data monitored by the gyroscope in real time.

[0040] S6. Change the load condition and calibrate again. Change the height of the liftable support frame to match the height of the load-bearing platform on both sides of the test ship model, and complete the calibration test steps again to achieve the horizontal bending moment load calibration under different load conditions.

[0041] S7, data processing;

[0042] By interconnecting the various steps, the calibration of the horizontal bending moment of the container hydroelastic ship model under still water conditions is completed.

[0043] As a further improvement of the above technical solution:

[0044] In the installation and calibration platform, the number and connection degree of the bolts and gaskets connecting the watertight box and the one-way force balance to the supporting base are adjusted to ensure that the horizontal shafts are on the same horizontal line.

[0045] In one embodiment, the data processing step includes: processing the measured horizontal bending moment based on the data obtained by the calibration method, drawing the numerical surface of the signal of the horizontal bending moment acquisition channel under the action of torque load and horizontal bending moment load, determining the horizontal bending moment calibration curve under this torsional load value according to the torsional load value, obtaining the calibration coefficient between the acquisition channel signal and the horizontal bending moment value under this horizontal bending moment calibration curve, transforming the torque value, and obtaining the calibration coefficient matrix of the horizontal bending moment load of the ship model under the combined action of bending and torsion loads.

[0046] The beneficial effects of the present invention are as follows:

[0047] The present invention has the following advantages:

[0048] Compared with the traditional weight loading method, the device of the present invention coordinates the control of the servo motor and the single-component force balance. The servo motor provides power and the single-component force displays the value to adjust the size of the servo motor until the target value is reached. The load is added stably and is not affected by external interference.

[0049] The device of the present invention combines a lifting support platform and loading heads at different heights of the ship model shell to achieve accurate calibration of the horizontal bending moment of the container ship under the bending-torsion coupling stress state.

[0050] Compared with the constant horizontal bending moment calibration coefficient, the method of the present invention takes into account the combined influence of torque, forms a horizontal bending moment calibration matrix, and further improves the accuracy of the calibration data. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 Schematic diagram of the deformation of the center axis of the ship model of the present invention under the action of horizontal bending moment.

[0052] Figure 2 This is a side view of the ship model of the present invention with the force-bearing device installed on land.

[0053] Figure 3 This is a top view of the ship model of the present invention with the force-bearing device installed on land.

[0054] Figure 4This is a schematic diagram of the calibration device of the present invention when performing a calibration test.

[0055] Figure 5 This is a front view of the ship model of the present invention with a mooring system installed in a test water tank.

[0056] Figure 6 This is a top view of the mooring system installed in the test pool of the ship model of the present invention.

[0057] Figure 7 This is a schematic diagram of the ship model of the present invention under the action of the loading head.

[0058] Figure 8 It is a force diagram of the ship model of the present invention under the action of the calibration load.

[0059] Figure 9 It is the numerical surface of the signal of the horizontal bending moment acquisition channel under the combined action of bending and torsional loads.

[0060] Figure 10 It is a calibration curve diagram of the horizontal bending moment of the torque load under specific values corresponding to the present invention.

[0061] in:

[0062] 1. Test ship model; 2. Platform mounting base; 3. Load-bearing platform; 4. Servo motor; 5. Worm gear; 6. Horizontal shaft; 7. Loading head; 8. One-way force balance; 9. Watertight box; 10. Liftable support frame; 11. Support base; 12. Gyroscope; 13. Mooring system. DETAILED DESCRIPTION

[0063] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0064] The present invention aims to provide a device and method for calibrating the static horizontal bending moment of a containerized hydroelastic ship model. The device and method utilize a servo motor 4, a worm gear 5, a watertight box 9, a horizontal shaft 6, a gyroscope 12, a mooring system 13, a unidirectional force balance 8, a loading head 7, a load-bearing platform 3, a platform mounting base 2, and a liftable support frame 10. By controlling the forward and backward movement of the horizontal shaft 6 connected to the servo motor 4 at a corresponding position, and based on the load value of the unidirectional force balance 8, a series of horizontal bending moment loads are accurately applied to the hull beam of the test ship model 1. Furthermore, a horizontal bending moment calibration coefficient matrix for the hydroelastic ship model under a bending-torsion coupling state is obtained. This device and method are of great significance in the field of shipbuilding engineering. In the process of ship design and development, accurately determining the stress conditions of a ship under various operating conditions is key to ensuring the safety and reliability of the ship structure. Traditional methods often struggle to accurately simulate the complex horizontal bending moment loads experienced by ships during actual navigation. However, the device and method of the present invention, by precisely controlling the movement of the horizontal shaft 6 and combining it with accurate measurement using a unidirectional force balance 8, can more realistically simulate the stress conditions of a ship in still water, providing more accurate data support for ship structural strength design and optimization. Furthermore, by considering the horizontal bending moment calibration coefficient matrix under bending-torsion coupling, it can more comprehensively reflect the stress characteristics of a ship during actual navigation, helping to improve the overall performance and safety of the ship.

[0065] Example 1

[0066] The present embodiment discloses a device for calibrating the horizontal bending moment of a container hydroelastic ship model in still water, which is used to calibrate the horizontal bending moment of a container hydroelastic ship model 1 under still water conditions to obtain accurate horizontal bending moment load data, thereby providing a reliable basis for the design and optimization of ship structure strength. In ship engineering, calibrating the horizontal bending moment of a ship model is an important step in evaluating the strength of a ship structure. By obtaining accurate horizontal bending moment load data, engineers can better understand the stress conditions of the ship under different working conditions, thereby optimizing the design of the ship structure and improving the safety and reliability of the ship. The device of the present embodiment can simulate the horizontal bending moment that a ship is subjected to during actual navigation under still water conditions, thereby providing strong data support for the design and optimization of ship structure strength.

[0067] The device primarily comprises a servo motor 4, a worm gear 5, a watertight box 9, a horizontal shaft 6, a gyroscope 12, a mooring system 13, a unidirectional force balance 8, a loading head 7, a load-bearing platform 3, a platform mounting base 2, and a liftable support frame 10. These components work together to calibrate the horizontal bending moment of a containerized hydroelastic ship model 1 under still water conditions. While each component plays a distinct role within the device, they collaborate to achieve the horizontal bending moment calibration task. The servo motor 4 serves as a power source, providing driving force for the entire device; the worm gear drive 5 converts rotational motion into linear motion to achieve precise movement of the horizontal shaft 6; the watertight box 9 protects the servo motor 4 and the worm gear drive 5 from moisture erosion; the horizontal shaft 6 is a key component for transmitting horizontal bending moment; the gyroscope 12 is used to monitor the posture of the test ship model 1 to ensure the accuracy of the calibration process; the mooring system 13 limits the movement of the test ship model 1 to ensure the accuracy of the load value; the unidirectional force balance 8 measures the horizontal bending moment load value; the loading head 7 and the force platform 3 directly apply and bear the horizontal bending moment; the platform mounting base 2 fixes the force platform 3; the liftable support frame 10 supports and adjusts the height of each component to ensure that they are on the same horizontal line.

[0068] The servo motor 4 and the worm gear transmission 5 in this embodiment: the servo motor 4 serves as a power source, and converts the rotational motion into linear motion through the worm gear transmission 5, driving the horizontal shaft 6 to move forward and backward. The worm gear transmission 5 has the advantages of a large transmission ratio and good self-locking property, which can ensure the accuracy and stability of the movement of the horizontal shaft 6. The servo motor 4 has the characteristics of high precision and high response speed, and can accurately control the moving distance and speed of the horizontal shaft 6. The large transmission ratio of the worm gear transmission 5 means that a larger output thrust can be obtained with a smaller input torque, thereby more effectively driving the horizontal shaft 6. At the same time, its good self-locking property can prevent the horizontal shaft 6 from accidentally moving when subjected to external force, ensuring the stability and accuracy of the calibration process. This combination makes the movement of the horizontal shaft 6 more precise and controllable, providing a guarantee for the accurate application of horizontal bending moment.

[0069] The watertight box 9 in this embodiment is used to seal the servo motor 4 and the worm gear transmission device 5 to prevent moisture from entering and causing damage to the equipment. The watertight box 9 is provided with a threading hole for leading out the power line and control line of the servo motor 4. At the same time, the watertight box 9 is also provided with a shaft sleeve for extending the horizontal shaft rod 6 and ensuring its sealing. In ship model tests, the equipment usually needs to work in water, so watertightness is of vital importance. The watertight box 9 can effectively isolate the servo motor 4 and the worm gear transmission device 5 from water, prevent moisture from entering and causing problems such as equipment short circuit and corrosion, and extend the service life of the equipment. The design of the threading hole facilitates the connection of the power line and the control line, while ensuring the sealing of the watertight box 9. The shaft sleeve ensures that the horizontal shaft rod 6 can be smoothly extended from the watertight box 9, while preventing moisture from entering from the gap between the shaft and the box body, further improving the watertight performance of the device.

[0070] The horizontal shaft rod 6 in this embodiment is a key component for transmitting horizontal bending moment. One end of it is connected to the worm gear transmission device 5, and the other end is connected to the loading head 7. Driven by the servo motor 4, the horizontal shaft rod 6 can move back and forth, thereby applying a horizontal bending moment to the test ship model 1. The horizontal shaft rod 6 needs to have sufficient strength and rigidity to withstand the horizontal bending moment applied to the test ship model 1. Its connection with the worm gear transmission device 5 and the loading head 7 needs to be firm and reliable to ensure that it will not loosen or fall off during the movement. Driven by the servo motor 4, the horizontal shaft rod 6 can move accurately according to the set distance and speed, thereby achieving precise loading of the test ship model 1. The precise movement of the horizontal shaft rod 6 is one of the key factors to ensure the accuracy of the application of horizontal bending moment.

[0071] The gyroscope 12 in this embodiment is used to monitor the attitude of the test ship model 1 to ensure that the test ship model 1 maintains a balanced state during the calibration process without movement or rotation changes. The data of the gyroscope 12 can be fed back to the control system in real time so as to accurately adjust the movement of the servo motor 4. During the calibration process, the attitude stability of the test ship model 1 is crucial for obtaining accurate horizontal bending moment load data. The gyroscope 12 can monitor the attitude changes of the test ship model 1 in real time, including parameters such as the tilt angle and rotation speed. When the attitude changes of the test ship model 1, the gyroscope 12 will promptly feed back the data to the control system, and the control system will adjust the movement of the servo motor 4 based on these data, so that the movement of the horizontal shaft 6 can promptly adapt to the attitude changes of the test ship model 1, ensuring that the application of the horizontal bending moment is always within the expected range, thereby improving the accuracy of the calibration.

[0072] The mooring system 13 in this embodiment is used to limit the movement of the test ship model 1 during the calibration process. It is arranged along the four sides of the test ship model 1. When the horizontal bending moment is loaded, the mooring system 13 can be disconnected to ensure the accuracy of the load value. The mooring system 13 is usually composed of components such as cables and anchor chains, and has sufficient strength and stability. The main function of the mooring system 13 is to limit its movement in the horizontal direction after the test ship model 1 enters the water, so that it maintains a relatively stable position for the calibration of the horizontal bending moment. When the horizontal bending moment is loaded, the mooring system 13 is disconnected to avoid its interference with the horizontal bending moment load value, thereby ensuring the accuracy of the measurement results. Components such as cables and anchor chains need to have sufficient strength and stability to withstand the various external forces acting on the test ship model 1 in still water, and at the same time will not affect the positional stability of the test ship model 1 due to their own deformation or breakage.

[0073] The unidirectional force balance 8 in this embodiment is used to measure the horizontal bending moment load value applied by the horizontal shaft rod 6 to the test ship model 1. It has the characteristics of high precision and high sensitivity, and can accurately reflect the changes in the load. The data of the unidirectional force balance 8 is an important basis in the calibration process. The unidirectional force balance 8 is a key device for obtaining horizontal bending moment load data. Its high precision and high sensitivity can ensure the accuracy of the measurement results, and even very small load changes can be accurately captured. During the calibration process, the unidirectional force balance 8 measures the horizontal bending moment load value applied by the horizontal shaft rod 6 to the test ship model 1 in real time, and feeds these data back to the control system. These data are an important basis for evaluating the stress condition of the test ship model 1 and determining the horizontal bending moment calibration coefficient matrix, and are of great significance to the design and optimization of ship structure strength.

[0074] In this embodiment, the loading head 7 is installed at the end of the horizontal shaft 6 and is used to directly apply a horizontal bending moment to the test ship model 1. The force platform 3 is installed on the port and starboard sides of the bow, midship and stern of the test ship model 1 to withstand the horizontal bending moment applied by the loading head 7. The design of the loading head 7 and the force platform 3 needs to take into account their rigidity and wear resistance to ensure the accuracy and reliability of the calibration. The loading head 7 needs to have a suitable shape and size so that it can effectively convert the thrust of the horizontal shaft 6 into a horizontal bending moment on the test ship model 1. At the same time, its surface needs to be smooth to reduce the friction between it and the force platform 3 and ensure that the horizontal bending moment is applied more accurately. The force platform 3 is installed at a key position of the test ship model 1 and needs to withstand a large horizontal bending moment load. Therefore, it must have sufficient rigidity to avoid deformation during the force-bearing process, which affects the calibration results. In addition, since there will be frequent contact and friction between the loading head 7 and the force platform 3, their surfaces also need to have good wear resistance to extend the service life of the equipment and ensure the long-term accuracy and reliability of the calibration.

[0075] The platform mounting base 2 in this embodiment is used to fix the force-bearing platform 3 to ensure its accuracy and stability during the installation process. The platform mounting base 2 is usually made of high-strength steel and has sufficient rigidity and load-bearing capacity. The platform mounting base 2 is the installation foundation of the force-bearing platform 3, and its installation accuracy directly affects the position and posture of the force-bearing platform 3, and thus affects the effect of applying the horizontal bending moment. Made of high-strength steel, it can ensure that the platform mounting base 2 has sufficient rigidity and load-bearing capacity, and can firmly fix the force-bearing platform 3 so that it will not loosen or shift during the calibration process. At the same time, high-strength steel also has good corrosion resistance and stability, and can maintain its performance unchanged during long-term use, providing a guarantee for the stable operation of the calibration device.

[0076] The liftable support frame 10 in this embodiment is used to support components such as the watertight box 9, the one-way force balance 8 and the loading head 7, and can ensure that the components are on the same horizontal line by adjusting its height. The design of the liftable support frame 10 needs to take into account its stability and adjustment accuracy to meet different test requirements. The liftable support frame 10 is an important supporting structure of the entire calibration device. It needs to bear the weight of multiple key components, so it must have good stability. By adjusting the height, the watertight box 9, the one-way force balance 8 and the loading head 7 and other components can be kept on the same horizontal line, ensuring that the moving direction of the horizontal shaft 6 is consistent with the force direction of the test ship model 1, and ensuring that the horizontal bending moment is applied accurately. Its adjustment accuracy directly affects the accuracy of the calibration results, so it is necessary to adopt a high-precision adjustment mechanism to meet the height adjustment requirements under different test requirements.

[0077] The specific working principle in this embodiment is as follows:

[0078] Before the test begins, the test ship model 1 is first placed in the test water tank, and the platform installation base 2 and the force platform 3 are symmetrically installed on the left and right sides of the bow, midship and stern. Then, the servo motor 4 and the worm gear transmission device 5 are placed in the watertight box 9 and sealed. Next, the watertight box 9 and the one-way force measuring balance 8 are fixed on the liftable support frame 10 through the support base 11, and their heights are adjusted to ensure that the horizontal shaft 6 are on the same horizontal line. The preparation work before the test is the key to ensuring the smooth progress of the calibration test. Placing the test ship model 1 in the test water tank can simulate the actual working conditions of the ship in still water. The symmetrical installation platform installation base 2 and the force platform 3 can ensure that the test ship model 1 is evenly stressed when stressed, avoiding inaccurate test results due to uneven stress. Placing the servo motor 4 and the worm gear transmission device 5 in the watertight box 9 and sealing it can effectively protect the equipment from moisture erosion. Adjusting the height of the liftable support frame 10 so that the horizontal shaft 6 is on the same horizontal line is to ensure that the direction of application of the horizontal bending moment is correct and to avoid the generation of additional component forces of the horizontal bending moment due to height inconsistency, which affects the accuracy of the calibration results.

[0079] During the test, the control system controls the movement of the servo motor 4, driving the horizontal shaft 6 back and forth, thereby applying a horizontal bending moment to the test ship model 1. Simultaneously, the gyroscope 12 monitors the test ship model 1's attitude in real time, ensuring that the model 1 remains balanced during the calibration process. A unidirectional force balance 8 measures the horizontal bending moment load applied by the horizontal shaft 6 on the test ship model 1 and feeds this data back to the control system. Based on this feedback, the control system precisely adjusts the movement of the servo motor 4 to accurately apply the series of horizontal bending moment loads.

[0080] During the test, the various components work together to complete the calibration task of the horizontal bending moment. The control system controls the movement of the servo motor 4 according to a preset program, so that the horizontal shaft 6 moves back and forth according to the set rules, and applies horizontal bending moments of different sizes to the test ship model 1. The gyroscope 12 monitors the posture of the test ship model 1 in real time. Once a change in posture is detected, the data is fed back to the control system in a timely manner. The control system adjusts the movement of the servo motor 4 according to the feedback data to ensure that the test ship model 1 always maintains a balanced state and ensures that the horizontal bending moment is applied accurately. The unidirectional force measuring balance 8 measures the horizontal bending moment load value in real time and feeds the data back to the control system. The control system further accurately adjusts the movement of the servo motor 4 based on this data to achieve the accurate addition of a series of horizontal bending moment loads, providing accurate and reliable data support for subsequent data processing and analysis.

[0081] After completing calibration under one load condition, the load condition is changed by changing the height of the elevating support frame 10 and the calibration test is repeated. Finally, based on the data obtained during the calibration process, the measured horizontal bending moment is processed, and the numerical surface of the horizontal bending moment acquisition channel signal under torque load and horizontal bending moment load is plotted. The horizontal bending moment calibration matrix coefficients are further determined.

[0082] Changing the load conditions can obtain more comprehensive horizontal bending moment load data and more realistically simulate the complex load conditions that ships are subjected to during actual navigation. By changing the height of the liftable support frame 10, the position and angle of the horizontal shaft 6 on the test ship model 1 can be changed, thereby generating different load conditions. After re-calibration testing, more data samples are obtained. Based on these data, the measured horizontal bending moment is processed, and the numerical surface is drawn to intuitively show the variation pattern of the horizontal bending moment under different torque loads and horizontal bending moment loads. Further determining the horizontal bending moment calibration matrix coefficient can provide a more accurate basis for the design and optimization of ship structure strength, which helps to improve the overall performance and safety of the ship.

[0083] In summary, the static horizontal bending moment calibration device for a container hydroelastic ship model in this embodiment has the following advantages:

[0084] Improved Calibration Accuracy: This device, through the precise coordination of components such as the servo motor 4, worm gear 5, and unidirectional force balance 8, accurately applies and measures the horizontal bending moment of the test ship model 1. Compared with traditional calibration methods, this device offers higher accuracy and reliability, more accurately reflecting the horizontal bending moment loads experienced by the ship model during actual navigation.

[0085] Adaptable to Different Load Conditions: The device's design of a liftable support frame 10 allows for convenient changes in load conditions, enabling calibration of horizontal bending moment loads under various load conditions. This allows the device to adapt to diverse testing requirements, providing more comprehensive data support for ship structural strength design and optimization.

[0086] Improved test efficiency: This device automates the calibration process, reducing manual intervention and errors. Furthermore, through the precise control of the servo motor 4 by the control system, the addition and measurement of a series of horizontal bending moment loads can be completed quickly and accurately, improving test efficiency.

[0087] Enhanced device stability: The platform-mounted base 2 and liftable support frame 10 ensure the stability and precision of each component during installation and use. Furthermore, the watertight box 9 effectively prevents water ingress and damage to the device, enhancing its reliability and durability.

[0088] Example 2

[0089] This embodiment discloses a method for calibrating the horizontal bending moment of a containerized hydroelastic ship model in still water. The method is used to calibrate the horizontal bending moment of a containerized hydroelastic ship model 1 under still water conditions to obtain accurate horizontal bending moment load data, providing a reliable basis for ship structural strength design and optimization. In the field of ship engineering, accurate horizontal bending moment load data is crucial for ship structural strength design and optimization. The method of this embodiment can calibrate the horizontal bending moment of a containerized hydroelastic ship model 1 under still water conditions, providing reliable data support for ship structural strength design and optimization, and helping to improve the safety and reliability of ships.

[0090] The present invention aims to provide a method for calibrating the hydrostatic horizontal bending moment of a containerized hydroelastic ship model to address the prior art problem of being unable to directly apply a series of horizontal bending moments to the test ship model 1 for hydrostatic calibration, thereby improving the accuracy of horizontal bending moment load test data. The present invention also addresses the limitations of prior art calibration methods that may prevent direct and accurate application of a series of horizontal bending moments for hydrostatic calibration, thereby affecting the accuracy of horizontal bending moment load test data.

[0091] The method of this embodiment can effectively solve these problems by adopting the device in Example 1 and operating according to specific steps, improve the accuracy of horizontal bending moment load test data, and provide a more reliable basis for ship structure strength design and optimization.

[0092] This method adopts the device in Example 1, which mainly includes the steps of installing the platform installation base 2 and the force-bearing platform 3, sealing the watertight box 9, installing the calibration platform, putting the ship model into the water, starting the calibration test, changing the load condition and re-calibrating, and data processing. These steps are interconnected to complete the calibration of the horizontal bending moment of the container hydroelastic ship model 1 under static water conditions. Each step plays an important role in the calibration process, and they are interconnected to form a complete calibration process. The installation platform installation base 2 and the force-bearing platform 3 are the basis of calibration, providing support for the subsequent application of horizontal bending moment; the sealed watertight box 9 protects the equipment from moisture erosion; the calibration platform is installed to ensure that all components are on the same horizontal line; the ship model is put into the water to simulate the actual working conditions; the calibration test is started to apply and measure the horizontal bending moment; the load condition is changed and re-calibrated to obtain more comprehensive data; the data processing analyzes and processes the measured data to obtain the horizontal bending moment calibration coefficient matrix.

[0093] The steps include:

[0094] S1. Install the platform installation base 2 and the force-bearing platform 3: Before the test ship model 1 is placed in the test water tank, the platform installation base 2 and the force-bearing platform 3 are symmetrically installed on the left and right sides of the bow, midship, and stern of the test ship model 1. Accuracy must be ensured during the installation process to avoid affecting the buoyancy of the test ship model 1 in still water. The design of the platform installation base 2 and the force-bearing platform 3 needs to take into account their rigidity and stability to ensure that they can withstand the horizontal bending moment applied by the loading head 7 during the calibration process. The installation accuracy of the platform installation base 2 and the force-bearing platform 3 directly affects the stress and buoyancy of the test ship model 1 during the calibration process. Symmetrical installation can ensure that the test ship model 1 is subjected to uniform stress when subjected to stress, avoiding inaccurate test results due to uneven stress. The platform installation base 2 and the force-bearing platform 3 need to have sufficient rigidity and stability to withstand the horizontal bending moment applied by the loading head 7, avoiding deformation during the stress process, which affects the accuracy of the calibration results. During the installation process, precise measuring tools need to be used for positioning and adjustment to ensure that the installation accuracy meets the requirements.

[0095] S2. Seal the watertight box 9: Place the servo motor 4 and the worm gear transmission device 5 in the watertight box 9 and seal it. The power cord and control cord of the servo motor 4 are led out through the threading hole of the watertight box 9, and the horizontal shaft rod 6 extends out through the shaft sleeve on the watertight box 9. The overall watertightness of the watertight box 9 needs to be guaranteed to prevent moisture from entering and causing damage to the equipment. The sealing treatment of the watertight box 9 is a key step in protecting the servo motor 4 and the worm gear transmission device 5. After placing the servo motor 4 and the worm gear transmission device 5 in the watertight box 9, it is necessary to use appropriate sealing materials and sealing processes to seal them to ensure that the inside of the watertight box 9 is completely isolated from the outside world. When the power cord and control cord of the servo motor 4 are led out through the threading hole, it is necessary to use sealing parts such as sealing rubber rings to seal them to prevent moisture from entering through the threading hole. When the horizontal shaft rod 6 extends through the shaft sleeve, the shaft sleeve and the horizontal shaft rod 6 also need to be sealed to ensure the overall watertightness of the watertight box 9. Good watertightness can effectively prevent moisture from entering the interior of the device, avoid damage to the device due to moisture, and extend the service life of the device.

[0096] S3. Install the calibration platform: fix the watertight box 9 and the one-way force balance 8 on the liftable support frame 10 through the support base 11. Ensure that the horizontal shaft 6 is on the same horizontal line by adjusting the number of bolts and gaskets connecting the watertight box 9 and the one-way force balance 8 to the support base 11 and the degree of connection. The design of the liftable support frame 10 needs to take into account its stability and adjustment accuracy to meet different test requirements. Installing the calibration platform is an important step to ensure that the horizontal shaft 6 is on the same horizontal line. After fixing the watertight box 9 and the one-way force balance 8 on the liftable support frame 10 through the support base 11, it is necessary to accurately adjust the height of the watertight box 9 and the one-way force balance 8 by adjusting the number of bolts and gaskets and the degree of connection so that the horizontal shaft 6 is on the same horizontal line. The stability and adjustment accuracy of the liftable support frame 10 directly affect the horizontality of the horizontal shaft 6. Therefore, it is necessary to use a high-quality liftable support frame 10 and adjust it strictly in accordance with the operating procedures to ensure that the adjustment accuracy meets the requirements. The liftable support frame 10 with high stability and adjustment accuracy can ensure that the horizontal shaft 6 always remains horizontal during the movement, thereby improving the accuracy of applying the horizontal bending moment.

[0097] S4. Launching the ship model into the water: The test ship model 1 with the calibration equipment installed is hoisted into the test water pool. In order to limit the movement of the test ship model 1 during the calibration process, a mooring positioning system 13 is arranged around the test ship model 1. When the mooring system 13 loads the horizontal bending moment on the test ship model 1, in order to ensure the accuracy of the load value, the mooring system 13 will be disconnected. Launching the ship model into the water simulates the working conditions of the ship in actual navigation. After the test ship model 1 with the calibration equipment installed is hoisted into the test water pool, a mooring positioning system 13 needs to be arranged around the test ship model 1 to limit the movement of the test ship model 1 during the calibration process and ensure that it maintains a relatively stable position during the calibration process. When loading the horizontal bending moment, disconnecting the mooring system 13 can avoid its interference with the horizontal bending moment load value and ensure the accuracy of the measurement results. The layout of the mooring positioning system 13 needs to be reasonably designed according to the size and shape of the test ship model 1 to ensure that it can effectively limit the movement of the test ship model 1 without having an excessive impact on the stress condition of the test ship model 1.

[0098] S5. Start the calibration test: complete the signal connection debugging of the servo motor 4, the one-way force balance 8, and the gyroscope 12. Adjust each liftable support frame 10 to a specific height so that each loading head 7, the force platform 3, and the horizontal shaft 6 are on the same horizontal line. Among them, the gyroscope 12 is used to monitor the attitude of the ship model to ensure that the test ship model 1 maintains a balanced state during the calibration process without movement and rotation changes. Based on the load data of the one-way force balance 8, control the servo motor 4 to add a series of loads to the test ship model 1 in the order from small to large and then from large to small, and repeat the process to complete the load data calibration. During the calibration process, it is necessary to record the load value of the one-way force balance 8 and the ship model attitude data monitored by the gyroscope 12 in real time. Starting the calibration test is a key step in obtaining horizontal bending moment load data. After completing the signal connection debugging of the servo motor 4, the one-way force balance 8, and the gyroscope 12, it is necessary to adjust each liftable support frame 10 to a specific height so that each loading head 7, the force-bearing platform 3, and the horizontal shaft 6 are on the same horizontal line to ensure that the direction of application of the horizontal bending moment is correct. The gyroscope 12 monitors the posture of the test ship model 1 in real time to ensure that the test ship model 1 maintains a balanced state during the calibration process. Based on the load data of the one-way force balance 8, the servo motor 4 is controlled to add a series of loads to the test ship model 1 in the order from small to large and then from large to small. Repeating this process multiple times can eliminate measurement errors and improve data accuracy. During the calibration process, the load value of the one-way force balance 8 and the ship model posture data monitored by the gyroscope 12 are recorded in real time to provide a basis for subsequent data processing and analysis.

[0099] S6. Change the load condition and calibrate again: change the height of the liftable support frame 10 to match the height of the force platforms 3 on both sides of the test ship model 1. Re-complete the above-mentioned calibration test steps to achieve calibration of the horizontal bending moment load under different load conditions. By changing the load condition, more comprehensive horizontal bending moment load data can be obtained, providing a richer basis for subsequent data processing and analysis. Changing the load condition can simulate the stress conditions of the ship under different sea conditions and different navigation conditions, and obtain more comprehensive horizontal bending moment load data. After changing the height of the liftable support frame 10 to match the height of the force platforms 3 on both sides of the test ship model 1, re-complete the calibration test steps to achieve calibration of the horizontal bending moment load under different load conditions. By changing the load condition multiple times to perform calibration tests, more data samples can be obtained, which provides a richer basis for subsequent data processing and analysis, and helps to more accurately evaluate the structural strength of the ship.

[0100] S7. Data Processing: Based on the data obtained using the calibration method above, the measured horizontal bending moment is processed. First, the numerical surfaces of the horizontal bending moment acquisition channel signal under torque and horizontal bending moment loads are plotted. Then, based on the torsional load value, the horizontal bending moment calibration curve at this torsional load value is determined. Next, the calibration coefficient between the acquisition channel signal and the horizontal bending moment value under this horizontal bending moment calibration curve is obtained. Finally, the torque value is transformed to obtain the calibration coefficient matrix of the horizontal bending moment load under the combined bending and torsional loads of the ship model. Through data processing and analysis, an accurate horizontal bending moment load calibration coefficient matrix can be obtained, providing a reliable basis for the design and optimization of ship structural strength. Data processing is a key step in converting raw measurement data into valuable information. Plotting the numerical surfaces of the horizontal bending moment acquisition channel signal under torque and horizontal bending moment loads can intuitively demonstrate the variation of horizontal bending moment under different torque and horizontal bending moment loads. Based on the torsional load value, the horizontal bending moment calibration curve at this torsional load value is determined, and the relationship between horizontal bending moment and acquisition channel signal can be obtained. After obtaining the calibration coefficient between the acquisition channel signal and the horizontal bending moment value under the horizontal bending moment calibration curve, the torque value is converted to obtain the calibration coefficient matrix of the horizontal bending moment load under the combined bending and torsion loads of the ship model. An accurate horizontal bending moment load calibration coefficient matrix can provide a reliable basis for ship structural strength design and optimization, helping to improve the structural safety and reliability of ships.

[0101] In summary, the method for calibrating the horizontal bending moment of a container hydroelastic ship model in still water in this embodiment has the following effects when actually used:

[0102] Automated calibration process: This method controls the movement of the servo motor 4 through the control system, thereby realizing the automated application and measurement of the horizontal bending moment of the test ship model 1. Compared with traditional calibration methods, this method reduces manual intervention and errors, and improves calibration accuracy and efficiency. The automated calibration process avoids the errors and instability caused by manual operation, and improves the accuracy and reliability of calibration. The control system can accurately control the movement of the servo motor 4 according to a preset program, thereby realizing the precise application and measurement of the horizontal bending moment. Compared with traditional calibration methods, this method reduces manual intervention and reduces the impact of human errors, while improving calibration efficiency, enabling faster acquisition of test data, and providing timely support for ship structure strength design and optimization.

[0103] Bending and torsion coupling load calibration: This method takes into account the coupling effect of horizontal bending moment and torque loads that the test ship model 1 is subjected to during the test. The calibration test is carried out by applying horizontal bending moment and torque loads at the same time, and the calibration matrix coefficient of the horizontal bending moment load is obtained based on the calibration data. This enables this method to more accurately reflect the complex load conditions that the ship model is subjected to during actual navigation. In actual navigation, the ship will be subjected to the coupling effect of horizontal bending moment and torque loads at the same time. This method takes this coupling effect into account, and by applying horizontal bending moment and torque loads at the same time for calibration tests, it can more realistically simulate the force conditions of the ship during actual navigation. The calibration matrix coefficient of the horizontal bending moment load is obtained based on the calibration data through fitting analysis, which can more accurately reflect the complex load conditions that the ship model is subjected to during actual navigation, provide a more accurate basis for the design and optimization of ship structure strength, and help improve the structural safety and reliability of the ship.

[0104] Calibration of multiple load conditions: This method changes the load condition by changing the height of the liftable support frame 10, thereby realizing the calibration of the horizontal bending moment load under different load conditions. This enables this method to adapt to different test requirements and provide more comprehensive data support for the design and optimization of ship structure strength. In actual navigation, ships will be subject to various load conditions. This method can flexibly change the load condition by changing the height of the liftable support frame 10, simulating the stress conditions of the ship under different sea conditions and different navigation conditions. This enables this method to obtain more comprehensive horizontal bending moment load data, providing a richer basis for the design and optimization of ship structure strength, and helping to design ship structures that are more adaptable to various complex conditions.

[0105] Improve test efficiency and flexibility: This method realizes an automated calibration process, reducing manual intervention and errors. At the same time, by changing the load conditions for calibration tests, the flexibility and adaptability of the test are improved. This enables this method to complete the calibration task more quickly and adapt to different test requirements. The automated calibration process improves test efficiency and reduces manual intervention and errors. By changing the load conditions for calibration tests, this method can flexibly adjust the test plan according to different test requirements, improving the flexibility and adaptability of the test. This enables this method to complete the calibration task more quickly, provide more timely data support for ship structure strength design and optimization, help shorten the ship R&D cycle, and reduce R&D costs.

[0106] Provide comprehensive data support for ship structure strength design and optimization: This method obtains more comprehensive horizontal bending moment load data through the application of multi-load condition calibration technology. These data can provide a more comprehensive basis for ship structure strength design and optimization, and help improve the safety and reliability of ship structures. Multi-load condition calibration technology enables this method to obtain more comprehensive horizontal bending moment load data, which covers the stress conditions of the ship under different working conditions. The strength design and optimization of ship structures require comprehensive consideration of the stress conditions under various working conditions. The data provided by this method can provide a more comprehensive basis for ship structure strength design and optimization, and help engineers more accurately evaluate the structural strength of the ship, optimize the ship structure design, and improve the safety and reliability of the ship structure.

[0107] Promoting the Development of Ship Model Testing Technology: The proposal and application of this method has promoted the development and innovation of ship model testing technology. By introducing advanced technologies such as automated calibration processes and bending-torsion coupled load calibration technology, the accuracy and efficiency of ship model testing have been improved, providing strong support for research and development in the field of shipbuilding engineering.

[0108] The introduction and application of this method has brought new development opportunities to ship model testing technology. The application of advanced technologies such as automated calibration processes and bending-torsion coupled load calibration techniques has improved the accuracy and efficiency of ship model testing, enabling ship model tests to more accurately simulate the forces acting on a ship during actual navigation, providing more reliable data support for research and development in the field of ship engineering. Furthermore, the successful application of this method has provided a reference for research in other related fields, promoting technological advancement in the entire field of ship engineering.

[0109] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. A device for calibrating the horizontal bending moment of a container hydroelastic ship model in still water, characterized in that: include: a power transmission assembly for providing and controlling the application of horizontal bending moments; sealing assemblies, used to protect power transmission components from environmental influences; Measuring assembly, used to measure the value of horizontal bending moment load applied to the test ship model; Loading assembly, used to directly apply horizontal bending moment to the test ship model; Support assembly, used to support and adjust the position of various components of the device; Positioning assembly, used to limit the movement of the test ship model during the calibration process and monitor the attitude of the test ship model; Realize the calibration of the horizontal bending moment of the container hydroelastic ship model under still water conditions.

2. The device for calibrating the static horizontal bending moment of a container hydroelastic ship model according to claim 1 is characterized in that: The power transmission assembly includes: Servo motor, as the power source; A worm gear, connected to the servo motor, is used to convert rotary motion into linear motion; A horizontal shaft, one end of which is connected to the worm gear and the other end is connected to the loading assembly, is used to transmit horizontal bending moment.

3. The static horizontal bending moment calibration device for a container hydroelastic ship model according to claim 1 is characterized in that: The sealing assembly comprises: Watertight box to seal the servo motor and worm drive to prevent moisture from entering; Wire holes are provided on the watertight box and are used to lead out the power lines and control lines of the servo motor; The shaft sleeve is provided on the watertight box and is used to extend the horizontal shaft rod and ensure its sealing.

4. The device for calibrating the static horizontal bending moment of a container hydroelastic ship model according to claim 1 is characterized in that: The measurement component includes: One-way force balance is used to measure the horizontal bending moment load value applied by the horizontal shaft to the test ship model.

5. The static horizontal bending moment calibration device for a container hydroelastic ship model according to claim 1 is characterized in that: The loading component includes: The loading head is installed at the end of the horizontal shaft and is used to directly apply horizontal bending moment to the test ship model; The load-bearing platform is installed on the port and starboard sides of the bow, midship and stern of the test ship model to withstand the horizontal bending moment applied by the loading head.

6. The static water horizontal bending moment calibration device for a container hydroelastic ship model according to claim 1 is characterized in that: The support assembly comprises: The liftable support frame is used to support components such as the watertight box, unidirectional force balance and loading head, and its height can be adjusted to ensure that all components are on the same level.

7. The static horizontal bending moment calibration device for a container hydroelastic ship model according to claim 1 is characterized in that: The positioning component includes: A mooring system to limit the movement of the test ship model during calibration; The gyroscope is used to monitor the attitude of the test ship model and ensure that the test ship model remains balanced during the calibration process.

8. A method for calibrating the horizontal bending moment of a container hydroelastic ship model in still water, characterized in that: The method uses the static horizontal bending moment calibration device for a container hydroelastic ship model according to any one of claims 1 to 7, and further includes the following steps: S1. Install the platform installation base and force platform symmetrically on the port and starboard sides of the bow, midship and stern of the test ship model, ensuring installation accuracy to avoid affecting the buoyancy of the test ship model in still water; S2. Seal the power transmission assembly, place the servo motor and worm gear into a watertight box, and seal it; S3. Install the calibration platform, secure the watertight box and unidirectional force balance to the liftable support frame through the support base, and adjust the number of bolts and gaskets connecting the watertight box and unidirectional force balance to the support base and the degree of connection to ensure that the horizontal shafts are on the same horizontal line; S4, the ship model is put into water; S5. Start the calibration test and debug the equipment. Adjust the height of each lifting support frame so that each loading head, force-bearing platform, and horizontal shaft are in a horizontal line. Based on the load data of the one-way force balance, control the servo motor to add a series of loads to the test ship model in the order of small to large and then large to small. Repeat the load data calibration multiple times and record the load value of the one-way force balance and the ship model attitude data monitored by the gyroscope in real time. S6. Change the load condition and calibrate again. Change the height of the liftable support frame to match the height of the load-bearing platform on both sides of the test ship model, and complete the calibration test steps again to achieve the horizontal bending moment load calibration under different load conditions. S7, data processing; By interconnecting the various steps, the calibration of the horizontal bending moment of the container hydroelastic ship model under still water conditions is completed.

9. The method for calibrating the static horizontal bending moment of a container hydroelastic ship model according to claim 8 is characterized in that: In the installation and calibration platform, the number and connection degree of the bolts and gaskets connecting the watertight box and the one-way force balance to the supporting base are adjusted to ensure that the horizontal shafts are on the same horizontal line.

10. The method for calibrating the still water horizontal bending moment of a container hydroelastic ship model according to claim 8, characterized in that: The data processing steps include: processing the measured horizontal bending moment based on the data obtained by the calibration method, drawing a numerical surface of the signal of the horizontal bending moment acquisition channel under the action of torque load and horizontal bending moment load, determining the horizontal bending moment calibration curve under this torsional load value according to the torsional load value, obtaining the calibration coefficient between the acquisition channel signal and the horizontal bending moment value under this horizontal bending moment calibration curve, transforming the torque value, and obtaining the calibration coefficient matrix of the horizontal bending moment load of the ship model under the combined action of bending and torsion loads.

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