A method for measuring structural characteristic parameters of a fully elastic hull scaled test model, electronic equipment, test model, and test method

Abstract

This invention discloses a method for determining the structural characteristic parameters of a scaled-down test model of a fully elastic ship hull, comprising: determining n longitudinal strain monitoring points for any cross section of the scaled-down test model of the ship hull, installing longitudinal strain sensors, and recording the coordinates of each sensor in the centroid coordinate system of the cross section; conducting uniform variable load tests and inclination tests on the ship hull test model in still water to obtain the strain change values ​​of the strain monitoring points on the cross section of the ship hull test model under different working conditions; using the draft, loaded weight, and loading position data recorded in the uniform variable load tests and inclination tests as inputs to conduct hydrostatic analysis to obtain the vertical bending moment difference and transverse bending moment difference of the cross section of the ship hull test model under different working conditions; and calculating the structural characteristic parameters of the cross section of the ship hull test model, including vertical bending stiffness and transverse bending stiffness.

Description

Technical Field

[0001] This invention belongs to the field of ship testing technology, and specifically relates to a method for determining the structural characteristic parameters of a scaled-down test model of a fully elastic hull, electronic equipment, test model, and test method. Background Technology

[0002] In existing ship hydrodynamic model tests, the hull is typically considered a rigid body, making it impossible to directly measure the wave loads experienced by the hull section during the test. To obtain the wave loads on the hull section, a segmented model method is commonly used. This involves cutting the hull at multiple transverse sections to create multiple segmented models, which are then connected by a steel beam. The segmented loads are calculated by measuring the strain of the steel beam, or by using multi-component force sensors to connect the various segments and directly measure the forces on the section. However, the fabrication, assembly, parameter simulation, and waterproofing of this segmented model are quite complex, often resulting in low accuracy of the measurement results. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this disclosure proposes a method for determining the structural characteristic parameters of a scaled-down fully elastic ship hull test model. This method involves determining the parameters for multiple cross-sections of the ship hull test model. Longitudinal strain monitoring points were set up with longitudinal strain sensors, and the coordinates of each sensor in the centroidal coordinate system of the transverse section were recorded. Uniform variable load tests and inclination tests were conducted on the hull test model in still water to obtain the strain changes at the strain monitoring points of the hull test model under different working conditions. Using the draft, loaded weight, and loading position data recorded from the uniform variable load and inclination tests as input, hydrostatic analysis was performed to obtain the vertical and transverse bending moment differences of the hull test model under different working conditions. The structural characteristic parameters of the hull test model's transverse section, including vertical bending stiffness and transverse bending stiffness, were calculated. Here, "fully elastic" refers to the method used in scaled-down hull model tests that can comprehensively simulate and measure the elastic response of the hull structure under different stress states. This method ensures that the test results accurately reflect the performance of the actual hull at all scales.

[0004] One aspect of this disclosure is a method for determining the structural characteristic parameters of a scaled-down test model of a fully elastic hull, comprising the following steps:

[0005] S1, for any cross section of the scaled-down test model of the fully elastic hull, determine (n≥2) longitudinal strain monitoring points are set up with longitudinal strain sensors, and the coordinates of each sensor in the centroid coordinate system of the cross section are recorded.

[0006] S2, uniform variable load test and inclination test of the scaled-down hull test model in still water, to obtain the strain change value of the longitudinal strain monitoring point of the cross section of the scaled-down hull test model under different working conditions.

[0007] S3 uses the draft, load weight, and load position data recorded from the uniform variable load test and the inclination test as input to carry out hydrostatic analysis and obtain the vertical bending moment difference and transverse bending moment difference of the cross section of the scaled-down test model of the hull under different working conditions.

[0008] S4, calculate the structural characteristic parameters of the cross section of the scaled-down test model of the hull, including vertical bending stiffness and transverse bending stiffness.

[0009] Furthermore, step S2 specifically includes the following steps:

[0010] (a) to proceed The scaled-down hull model was subjected to uniform variable load testing. The scaled-down hull model was placed in still water and finely adjusted to the initial waterline. The loaded weight, loading position data, strain values ​​measured by the longitudinal strain sensor, and draft at several locations around the scaled-down hull model were recorded. Then, the scaled-down hull model was subjected to uniform variable load testing, so that the draft around the scaled-down hull model changed uniformly until multiple preset target waterlines were reached. The loaded weight, loading position data, strain values ​​measured by the longitudinal strain sensor, and draft at several locations around the scaled-down hull model were recorded.

[0011] (b) to proceed The scaled-down hull model was subjected to inclination tests. The scaled-down hull model was placed in still water and finely adjusted to the initial waterline. The loaded weight, loading position data, strain values ​​measured by the longitudinal strain sensor, and draft at several locations around the scaled-down hull model were recorded. Then, the scaled-down hull model was subjected to variable loads, causing multiple different longitudinal and transverse heels. The loaded weight, loading position data, strain values ​​measured by the longitudinal strain sensor, and draft at several locations around the scaled-down hull model were recorded.

[0012] Furthermore, the scaled-down test model of the hull has at least four peripheral positions, distributed on the left front, right front, left rear, and right rear of the model.

[0013] One aspect of this disclosure is a scaled-down test model of a fully elastic hull, the structural characteristic parameters of which are determined by the method for determining the structural characteristic parameters of the scaled-down test model of a fully elastic hull.

[0014] One aspect of this disclosure is a test method for a scaled-down model of a fully elastic hull, the test method employing the aforementioned scaled-down model of a fully elastic hull.

[0015] In one aspect of this disclosure, an electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor running the computer program to implement the method for determining the structural characteristic parameters of the scaled-down fully elastic hull test model.

[0016] In one aspect of this disclosure, a storage medium storing a computer program that, when executed by a processor, implements the method for determining the structural characteristic parameters of the scaled-down test model of the fully elastic hull.

[0017] In one aspect of this disclosure, a computer program product includes a computer program that is executed by a processor to implement the method for determining the structural characteristic parameters of the scaled-down fully elastic hull test model.

[0018] Compared with the prior art, the beneficial effects of this disclosure include:

[0019] (1) This disclosure provides a method for determining the structural characteristic parameters of a scaled-down test model of a fully elastic hull, which solves the problem that errors caused by material, plate thickness and processing of the hull test model affect the accuracy of the test results;

[0020] (2) For the experimental ship model, the number of stress monitoring points required by this disclosure is relatively low, the operation is relatively simple, and the cost can be greatly reduced;

[0021] (3) The test results of the hull model under variable load and inclination can be used to compare and correct the design values, thus greatly improving the accuracy of the test results. Attached Figure Description

[0022] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of the invention are illustrated in the drawings by way of example and not limitation, wherein:

[0023] Figure 1 A flowchart of a method for determining structural characteristic parameters of a scaled-down test model of a fully elastic hull according to one embodiment of the present invention. Detailed Implementation

[0024] To address the problems in the prior art, this disclosure employs a scaled-down test model of a fully elastic hull, namely a hull model capable of generating measurable strain at the scale of a water tank test. Using this hull model, wave loads can be inverted by directly measuring the structural strain of the hull model. This model has advantages such as simple simulation and multiple measurable profiles.

[0025] However, the material properties, plate thickness, and manufacturing process of the model can all cause deviations between the structural characteristics of the hull model and the design values, thus affecting the accuracy of the inverse calculation of the cross-sectional wave load. Therefore, it is crucial to determine the structural characteristic parameters of the test model to ensure reliable test data on the hull cross-sectional wave load, thereby providing an important basis for ship design, operation, and maintenance.

[0026] Current literature commonly uses methods for correcting structural characteristic parameters of ship hull models, often employing the Bayes method for predicting structural characteristic parameters or simulating and correcting the structure using a finite element model established based on the initial design parameters of the ship test model. However, once the ship model is put into testing, it is difficult to directly measure the model's material or structural parameters. Therefore, for ship hull model testing, there is an urgent need for a practical and feasible method for determining the structural characteristic parameters of the test model.

[0027] According to one or more embodiments, a method for determining the structural characteristic parameters of a scaled-down test model of a fully elastic hull includes the following steps:

[0028] S101, for any cross section of the fully elastic hull scaled-down test model, determine n (n≥2) longitudinal strain monitoring points, install longitudinal strain sensors, and record the coordinates of each sensor in the centroid coordinate system of the cross section.

[0029] S102, uniform load test and inclination test of the scaled-down test model of the hull were carried out in still water to obtain the strain change value of the strain monitoring point of the cross section of the scaled-down test model of the hull under different working conditions.

[0030] S103 uses the draft, load weight, and load position data recorded from the uniform variable load test and the inclination test as input to carry out hydrostatic analysis and obtain the vertical bending moment difference and transverse bending moment difference of the cross section of the scaled-down test model of the hull under different working conditions.

[0031] S104, calculate the structural characteristic parameters of the cross section of the scaled-down test model of the hull, including vertical bending stiffness and transverse bending stiffness.

[0032] Specifically, step S102 includes the following steps:

[0033] (a) Conduct uniform load variation test on the scaled-down hull test model of group M. Place the scaled-down hull test model in still water and finely adjust it to the initial waterline. Record the loaded weight, loading position data, strain value measured by the longitudinal strain sensor, and the draft at several positions around the scaled-down hull test model. Then, uniformly vary the load on the scaled-down hull test model so that the draft around the scaled-down hull test model changes uniformly until multiple preset target waterlines are reached. Record the loaded weight, loading position data, strain value measured by the longitudinal strain sensor, and the draft at several positions around the scaled-down hull test model.

[0034] (b) Conduct inclination tests on N sets of scaled-down hull test models. Place the scaled-down hull test model in still water and fine-tune it to the initial waterline. Record the loaded weight, loading position data, strain values ​​measured by the longitudinal strain sensor, and the draft at several positions around the scaled-down hull test model. Then, apply variable loads to the scaled-down hull test model to produce multiple different longitudinal and transverse heels. Record the loaded weight, loading position data, strain values ​​measured by the longitudinal strain sensor, and the draft at several positions around the scaled-down hull test model.

[0035] According to one or more embodiments, this disclosure provides a method for correcting structural characteristic parameters of a scaled-down test model of a fully elastic hull. The specific steps of this method are as follows:

[0036] S201, for a certain cross section of the hull model, based on hydrodynamic analysis and finite element calculations, determine the section sensitive to overall wave loads. At each longitudinal strain monitoring point, a longitudinal strain sensor is installed, and the coordinates of each sensor in the centroidal coordinate system of the cross section are recorded. and ,in, .

[0037] S202, uniform variable load tests and inclination tests are conducted on a hull model in still water to obtain the strain change values ​​at a strain monitoring point on a certain cross section of the hull model under different working conditions. Specifically, the following steps are included:

[0038] (a) to proceed Uniform variable load test of the ship hull model. The ship hull model was placed in still water and finely adjusted to the initial waterline. The strain measured by the longitudinal strain sensor was then recorded. And the draft at four points around the hull model. ,in The draft is at the port front of the ship model. Right front draft, Left rear water intake, Right rear draft;

[0039] Determine s loading points, apply load to make the draft of the ship model change uniformly; record the s loading points. Loading weight data at each loading point during the uniform load change test Vertical loading position Horizontal loading position Vertical loading position drinking water .

[0040] Record the strain value of the longitudinal strain sensor after each loading. .

[0041] Further calculate each load Longitudinal strain change value at each longitudinal deformation monitoring point ;

[0042] (b) to proceed Inclination test of the ship model. Place the ship model in still water and finely adjust it to the initial waterline. Record the strain measured by the longitudinal strain sensor. And the draft at four points around the hull model. ,in The draft is at the port front of the ship model. Right front draft, Left rear water intake, Right rear draft;

[0043] Determine s loading points and apply load to make the ship model longitudinally tilt; after the longitudinal tilt condition is completed, clear the load and apply load again to make the ship model transversely tilt.

[0044] During the experiment, the first number was recorded. Loading weight data at each loading point in this test Vertical loading position Horizontal loading position Vertical loading position drinking water .

[0045] Record the strain value of the longitudinal strain sensor after each loading. .

[0046] Further calculate each load Longitudinal strain change value at each longitudinal deformation monitoring point .

[0047] In steps (a) and (b) here, the initial waterline is first fine-tuned to ensure that the waterlines are aligned. The initial state is recorded, including the surrounding waterlines and the ballast conditions. Then, the load is varied, and the hull model reaches the target waterline in different states. This state is then recorded, including the waterline and ballast conditions.

[0048] S203 uses data such as draft, load weight, and load position recorded from uniform variable load tests and inclination tests as input to conduct hydrostatic analysis and obtain the vertical bending moment difference and transverse bending moment difference of a certain cross section of the hull model under different working conditions.

[0049] For the ship model, the initial draft is... As input parameters, the initial vertical bending moment of a certain cross section is obtained based on hydrostatic analysis. With lateral bending moment .

[0050] The records of the uniform variable load test and the tilt test Loading weight data at each loading point in this test Vertical loading position Horizontal loading position Vertical loading position drinking water As input parameters, the vertical bending moment of a certain cross section is obtained based on hydrostatic analysis. With lateral bending moment The difference in vertical bending moment before and after each loading was calculated. Difference with lateral bending moment .

[0051] S204, For a certain cross section, calculate the structural characteristic parameters of the model's cross section. as well as ,in For vertical bending stiffness, The specific calculation method for lateral bending stiffness is as follows:

[0052] a. Regarding the first Group experiment ( ), n sensor strain change values Difference between vertical bending moment and a certain cross section Difference between lateral bending moment and lateral bending moment The following relationship must be satisfied.

[0053]

[0054] b. Regarding the first Group experiment ( The first number is calculated using the formula above. Group section structural characteristic parameters and .

[0055] c. For each set of experimental data, solve separately to obtain a total of M+N sets of profile structure characteristic parameters, and calculate the average value to obtain the profile structure characteristic parameters. as well as .

[0056]

[0057] According to one or more embodiments, a method for correcting structural characteristic parameters of a scaled-down test model of a fully elastic hull is provided, such as... Figure 1 As shown.

[0058] S1. Install longitudinal strain sensors on a scaled-down test model of a fully elastic hull and obtain the position parameters of each sensor, including the lateral coordinate y. a and vertical coordinate z a ;

[0059] S2, conduct uniform variable load tests and tilt tests, and record the test parameters and model floating parameters, including the load weight L. i Loading location (lx) i , ly i lz i Model draft D i The strain response of the model under different loading conditions is obtained, that is, the strain change values ​​of each longitudinal strain sensor. ;

[0060] S3 uses the test loading parameters and model floating parameters recorded in the uniform variable load test and tilting test as input to perform hydrostatic calculations and obtain the vertical bending moment variation values ​​of the model cross section under each test condition. and lateral bending moment variation ;

[0061] S4, based on the strain data obtained from S2 Combining the sensor position parameters obtained from S1 and the vertical bending moment obtained from S3 and lateral bending moment The structural characteristic parameters of the model's cross-section were calculated: vertical bending stiffness. and lateral bending stiffness .

[0062] In this embodiment, hydrodynamic analysis and finite element method are used to determine the cross-section of the hull structure. One longitudinal deformation monitoring point. Targeting Based on the variable load and inclination tests on the hull model, longitudinal deformation monitoring points were established, recording the load weight, location, and draft at each loading point. This data was obtained through strain sensors. Longitudinal strain change value at each longitudinal deformation monitoring point Using hydrostatic calculations, the change in vertical bending moment along the cross section was obtained. , Change in lateral bending moment Finally, the required structural characteristic parameters of the desired structural cross-section are obtained. as well as .

[0063] It should be understood that in the embodiments of the present invention, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, the character " / " in this document generally indicates that the preceding and following associated objects have an "or" relationship.

[0064] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0065] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0066] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0067] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for determining the structural characteristic parameters of a scaled-down test model of a fully elastic hull, characterized in that, Including the following steps: S1. For any cross section of the scaled-down test model of the fully elastic hull, determine n (n≥2) longitudinal strain monitoring points, install longitudinal strain sensors, and record the coordinates of each sensor in the centroid coordinate system of the cross section. S2, uniform variable load test and inclination test of the scaled-down hull test model in still water, to obtain the strain change value of the longitudinal strain monitoring point of the cross section of the scaled-down hull test model under different working conditions. S3 uses the draft, load weight, and load position data recorded from the uniform variable load test and the inclination test as input to carry out hydrostatic analysis and obtain the vertical bending moment difference and transverse bending moment difference of the cross section of the scaled-down test model of the hull under different working conditions. S4, calculate the structural characteristic parameters of the cross section of the scaled-down test model of the hull, including vertical bending stiffness and transverse bending stiffness.

2. The method according to claim 1, characterized in that, Step S2 specifically includes the following steps: (a) Conduct a uniform load change test on the M-group scaled-down hull test model. Place the scaled-down hull test model in still water, finely adjust it to the initial waterline, and record the loaded weight, loading position data, strain values ​​measured by the longitudinal strain sensor, and the draft at several positions around the scaled-down hull test model. Then, uniformly change the load on the scaled-down hull test model so that the draft around the scaled-down hull test model changes uniformly until multiple preset target waterlines are reached. Record the loaded weight, loading position data, strain values ​​measured by the longitudinal strain sensor, and the draft at several positions around the scaled-down hull test model.

3. The method according to claim 1, characterized in that, In step S2, the specific steps include: (b) conducting N sets of tilting tests on scaled-down hull test models, placing the scaled-down hull test models in still water, finely adjusting them to the initial waterline, recording the loaded weight, loading position data, strain values ​​measured by the longitudinal strain sensor, and the draft at several locations around the scaled-down hull test model, and then applying variable loads to the scaled-down hull test models to produce multiple different longitudinal and transverse tilts, recording the loaded weight, loading position data, strain values ​​measured by the longitudinal strain sensor, and the draft at several locations around the scaled-down hull test model.

4. The method according to claim 2 or 3, characterized in that, The scaled-down test model of the hull has at least four peripheral positions, distributed on the left front, right front, left rear, and right rear of the model.

5. A scaled-down test model of a fully elastic hull, characterized in that, The structural characteristic parameters of the model were determined by the measurement method described in any one of claims 1 to 4.

6. A method for a scaled-down model test of a fully elastic hull, characterized in that, The test method uses the scaled-down test model of the fully elastic hull as described in claim 5.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, The processor executes the computer program to implement the method as described in any one of claims 1 to 4.

8. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1 to 4.

9. A computer program product, comprising a computer program, characterized in that, The computer program is executed by a processor to implement the method according to any one of claims 1 to 4.

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