A method and system for testing the overturning of a suspended basket

Abstract

This invention provides a method for testing the overturning of a suspended platform, comprising: conducting an underwater overturning test on a scaled-down model of the suspended platform; calculating the first energy loss due to water resistance during the process of the scaled-down model freely overturning from its theoretical overturning posture to its post-overturning posture; calculating the second energy loss due to water resistance during the process of an actual-sized suspended platform specimen freely overturning underwater from its theoretical overturning posture to its post-overturning posture based on the first energy loss; using the second energy loss as the energy loss of the actual-sized suspended platform specimen in air from its theoretical overturning posture to its initial experimental posture, determining the initial experimental posture of the actual-sized suspended platform specimen and using it as the initial state of the actual-sized suspended platform specimen overturning in air, and conducting an overturning test of the actual-sized suspended platform specimen in air. This invention also provides a suspended platform overturning test system capable of implementing the aforementioned method.

Description

Technical Field

[0001] This invention relates to the field of spent fuel assembly storage and transportation technology, specifically to a basket overturning test method and test system. Background Technology

[0002] In the nuclear fuel cycle system, spent fuel storage and transportation baskets are critical equipment, and their design and safety analysis are of paramount importance. Spent fuel possesses properties such as high heat release, strong radioactivity, and easy criticality, requiring specialized equipment for safe and reliable storage and transportation. Currently, China possesses the technology to develop spent fuel storage racks, but research on storage and transportation baskets for spent fuel pools in reprocessing plants is relatively limited. Therefore, the development of baskets capable of continuous operation and providing storage and transportation of multiple spent fuel assemblies at once is urgently needed. Under accident conditions, the baskets may face risks such as falls and overturning, which could severely impact their structural integrity and functionality. Therefore, it is necessary to conduct component-level drop and overturning tests to verify the basket's design and performance, ensuring its safety and reliability under various operating conditions.

[0003] The suspended platform is approximately 5.3 meters high, posing numerous challenges for conducting underwater testing of a 1:1 scale prototype. Firstly, selecting the testing site and equipment presents difficulties. Underwater testing requires a pool of sufficient depth and size, as well as equipment capable of precise underwater measurements and data acquisition—conditions not all laboratories can meet. Secondly, testing costs will increase significantly. The setup of the underwater testing environment, waterproofing of equipment, and complex operational procedures will all contribute to increased costs.

[0004] In existing technologies, such as CN114635456A, a field-based composite cylindrical foundation overturning resistance model and its testing method are proposed. The model includes a test pool and a composite cylindrical foundation model body submerged within the test pool. It also includes a tension loading system located outside the test pool for pulling the model body, and a displacement sensor located inside the test pool for monitoring the model body. The tension loading system is connected to the model body via a first steel wire rope, and a tension sensor for recording tension data is connected between the model body and the first steel wire rope. Because the test location is chosen on a coastal mudflat, which more closely approximates the actual foundation installation environment, a 1:10 scale test model is designed and manufactured to more closely approximate the actual foundation dimensions, thus obtaining more accurate test data. After applying tension in stages through the tension loading system, the relationship between tension and displacement recorded by the sensors under sealed and unsealed conditions, and varying water depths, is analyzed to obtain relevant data conclusions, thus verifying the overturning resistance of the cylindrical foundation.

[0005] However, none of the existing technical solutions can completely solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the first aspect of the present invention provides a method for a suspended basket overturning test, comprising: conducting an underwater overturning test on a scaled-down model of the suspended basket; calculating a first energy loss due to water resistance during the process of the scaled-down model freely overturning from a theoretical overturning posture to a post-overturning posture; calculating a second energy loss due to water resistance during the process of an actual-sized suspended basket specimen underwater from a theoretical overturning posture to a post-overturning posture; using the second energy loss as the energy loss of the actual-sized suspended basket specimen in air from a theoretical overturning posture to an initial test posture, calculating the position parameters corresponding to the actual-sized suspended basket specimen in the initial test posture; and using the initial test posture as the initial state of the actual-sized suspended basket specimen overturning in air, conducting an overturning test on the actual-sized suspended basket specimen in air.

[0008] Furthermore, the second energy loss is n times the first energy loss, where n is the mass ratio of the actual-sized suspended basket specimen to the scale model of the suspended basket.

[0009] Furthermore, when the actual-sized suspended platform specimen and the scaled suspended platform model have the same density, and the center of gravity of the actual-sized suspended platform specimen and the center of gravity of the scaled suspended platform model are located at the same position, The The scaling factor is the ratio between the actual size suspended platform specimen and the scale model of the suspended platform.

[0010] Furthermore, the potential energy difference between the actual-sized suspended basket specimen in the air from the theoretical overturning posture to the initial experimental posture is taken as the second energy loss.

[0011] Furthermore, the positional parameters corresponding to the actual-sized suspended basket specimen in the initial experimental posture include the initial overturning angle, which is the angle between the axis of the actual-sized suspended basket specimen and the vertical axis.

[0012] Furthermore, the initial overturning angle is calculated using the following formula:

[0013] In the formula: The potential energy difference between the actual-sized suspended basket specimen in the theoretical overturning posture and the initial experimental posture; The mass of the actual-sized suspended basket specimen; The difference in center of gravity height between the actual size suspended basket specimen in the theoretical overturning posture and the initial experimental posture; The initial overturning angle; The height of the center of gravity of the actual-sized suspended basket specimen in the initial experimental posture; The length of the line connecting the center of gravity of the actual-sized suspended basket specimen in the initial experimental posture and its end on the horizontal plane is denoted as .

[0014] Furthermore, the overturning test of the actual-sized suspended basket specimen in air is conducted at least twice, and the contact point of the actual-sized suspended basket specimen is different in different overturning tests in air.

[0015] Furthermore, the stiffness of the actual-sized suspended basket specimen at the contact point differs in different numbers of overturning tests conducted in air.

[0016] Furthermore, the calculation of the first energy loss due to water resistance during the process of the suspended platform scale model tilting freely from the theoretical tilting posture to the tilted posture also includes:

[0017] Calculate the kinetic energy of the scaled model of the suspended basket when it freely tilts from the theoretical tilting posture to the tilted posture in water, and calculate the potential energy difference between the theoretical tilting posture and the tilted posture of the scaled model of the suspended basket in air.

[0018] Furthermore, the first energy loss is calculated using the following formula:

[0019] In the formula: The kinetic energy of the scaled-up basket model in water when it freely tilts from its theoretical overturning posture to its post-overturning posture. The potential energy difference between the theoretical overturning posture and the post-overturning posture of the scale model of the suspended basket in the air; This is the first energy loss; The mass of the scale model of the suspended platform; The length of the diagonal of the scale model of the suspended basket; The angular velocity of the scaled-up basket model underwater as it freely tilts from its theoretical tilting posture to its tilted posture.

[0020] Furthermore, the scaling ratio between the actual-size suspended basket specimen and the scaled model of the suspended basket is 2:1.

[0021] To achieve the above objectives, a second aspect of the present invention provides a basket overturning test system. The test device is capable of implementing the basket overturning test method and includes an underwater test device and an air test device. The underwater test device includes a test pool, a basket scale model, and a velocity measuring instrument. The velocity measuring instrument is disposed on the bottom surface of the test pool and is capable of measuring the velocity of the basket scale model when it collides with the bottom surface of the test pool. The air test device includes a full-size basket specimen, a target surface, and an overturning device. The target surface is placed horizontally, and the overturning device allows the full-size basket specimen to freely overturn at different angles relative to the vertical axis and collide with the target surface.

[0022] Furthermore, the depth of the test pool is 1.2 to 2 times the diagonal length of the scale model of the suspended basket, the width of the test pool is 0.8 to 1.5 times the diagonal length of the scale model of the suspended basket, and the length of the test pool is 1.5 to 2 times the diagonal length of the scale model of the suspended basket.

[0023] Furthermore, the target surface includes a concrete portion and a keel portion, both of which are located on the same side of the actual-sized suspended basket specimen, with the concrete portion being closer to the actual-sized suspended basket specimen than the keel portion.

[0024] Furthermore, the keel portion includes a keel, a first metal plate, and a plaster layer. The plaster layer is located below the keel and the first metal plate, and the first metal plate is fixed to the surface of the plaster layer by the keel.

[0025] Furthermore, the actual-size suspended platform specimen includes a dovetail groove and a tenon, both of which are located on the surface of the actual-size suspended platform specimen. The stiffness of the dovetail groove is less than that of the tenon.

[0026] Furthermore, the underwater testing device also includes an overturning protection device, which is disposed on the bottom surface of the testing pool.

[0027] Furthermore, the overturning protection device includes a second metal plate and a shock-absorbing material, wherein the shock-absorbing material is disposed on the surface of the second metal plate.

[0028] Furthermore, the speed measuring instrument is a high-speed camera and a camera protective housing, with the high-speed camera located inside the camera protective housing, which can isolate the high-speed camera from water.

[0029] By applying the above-described technical solution of the present invention, at least the following technical effects are achieved: 1. The suspended basket overturning test method proposed in this invention provides data input for the overturning test of the actual size suspended basket specimen in air by conducting an underwater overturning test on a scale model of the suspended basket. The overturning test of the actual size suspended basket specimen in air is used to simulate the process of the suspended basket overturning underwater, thus getting rid of the constraints of test conditions and saving test costs.

[0030] 2. The present invention provides a basket overturning test method. A basket scale model is established. Based on this model, the first energy loss due to water resistance during the process from the theoretical overturning posture to the post-overturning posture is calculated. The second energy loss of the actual-sized basket specimen in air from the critical overturning state to the post-overturning posture is then calculated. This allows for the calculation of the initial test posture of the actual-sized basket specimen in air, considering underwater energy loss. The theoretical overturning posture provides theoretical support for simulating underwater basket overturning using an actual-sized basket specimen overturning test in air.

[0031] 3. The basket overturning test method of the present invention involves at least two impacts between the actual size basket specimen and the target surface at different locations, thereby conducting conservative verification and evaluation of the actual size basket specimen and the target surface respectively.

[0032] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0033] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A schematic diagram of an underwater test apparatus in one embodiment is shown; Figure 2 A schematic diagram of an air-based testing apparatus is shown in one embodiment; Figure 3 Showed Figure 2 Enlarged image of the letter "A" in the image; Reference numerals: 1. Test water tank; 2. Scale model of the suspended basket; 3. Overturning protection fixture; 4. Speed ​​measuring instrument; 5. Actual size suspended basket specimen; 6. Target surface; 7. Overturning device; 8. Plaster layer; 9. Keel; 10. First metal plate; 11. Concrete part; 12. Keel part; 13. Dovetail groove; 14. Tenon. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] The present invention will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed by the present invention.

[0036] Example 1

[0037] According to one aspect of the present invention, a method for testing the overturning of a suspended platform is provided, comprising: conducting an underwater overturning test of a scaled-down model 2 of the suspended platform; calculating a first energy loss due to water resistance during the process of the scaled-down model 2 freely overturning from a theoretical overturning posture to a post-overturning posture; calculating a second energy loss due to water resistance during the process of the actual-sized suspended platform specimen 5 underwater from a theoretical overturning posture to a post-overturning posture; using the second energy loss as the energy loss of the actual-sized suspended platform specimen 5 in air from a theoretical overturning posture to an initial test posture, calculating the position parameters corresponding to the actual-sized suspended platform specimen 5 when it is in the initial test posture; and using the initial test posture as the initial state of the actual-sized suspended platform specimen 5 overturning in air, conducting an overturning test of the actual-sized suspended platform specimen 5 in air.

[0038] It should be noted that the theoretical overturning posture refers to the starting point of the overturning process of the scale model or full-size suspended basket specimen in water or air under the influence of gravity alone. The post-overturning posture refers to the stable state reached by the scale model or full-size suspended basket specimen in water or air after overturning. The initial experimental posture is the starting point of the required overturning process reached by the full-size suspended basket specimen under the influence of forces other than gravity.

[0039] Specifically, based on the test data obtained from the underwater test of the proportional model of the basket, the first energy loss due to water resistance during the process of the proportional model of the basket freely tilting from the theoretical tilting posture to the tilted posture is calculated. Then, based on the proportional relationship, the second energy loss due to water resistance during the process of the actual size basket specimen 5 tilting underwater from the theoretical tilting posture to the tilted posture is calculated. The second energy loss is used as the energy loss of the actual size basket specimen 5 in air from the theoretical tilting posture to the initial experimental posture, that is, the energy lost by the actual size basket specimen 5 in water is taken into account in the test under air environment. According to the principle of energy conservation, the position corresponding to the actual size basket specimen 5 in the initial experimental posture is calculated, that is, the position parameters corresponding to the actual size basket specimen 5 in the initial experimental posture are calculated. Using the initial experimental posture as the initial state of the actual size basket specimen 5 tilting in air, the tilting test of the actual size basket specimen 5 in air is carried out. Combining the data obtained from the test, a safety analysis of the spent fuel storage and transportation basket is carried out.

[0040] According to another aspect of the present invention, a basket overturning test system is provided. The test device is capable of performing the basket overturning test method and includes an underwater test device and an air test device. The underwater test device includes a test pool 1, a basket scale model 2, and a velocity measuring instrument 4. The velocity measuring instrument 4 is disposed on the bottom surface of the test pool 1 and is capable of measuring the velocity of the basket scale model 2 when it collides with the bottom surface of the test pool. The air test device includes a full-size basket specimen 5, a target surface 6, and an overturning device 7. The target surface 6 is placed horizontally, and the overturning device 7 is capable of allowing the full-size basket specimen 5 to freely overturn at different angles from the vertical axis and collide with the target surface 6.

[0041] Specifically, such as Figure 1-3 As shown, an underwater test of the scaled-down basket model is conducted in the underwater test apparatus. The top of the scaled-down basket model is marked with the identification and capture point of the velocity measuring instrument 4. The scaled-down basket model is placed above the bottom of the test pool, and the velocity measuring instrument 4 is located on one side of the top of the scaled-down basket model after it has tipped over. The scaled-down basket model is manually adjusted to its theoretical tipping posture, and then allowed to tip freely. At the instant the top of the scaled-down basket model contacts the bottom of the test pool, the velocity measuring instrument 4 calculates the velocity of the scaled-down basket model at the moment of contact with the bottom by capturing the identification and capture point on the top of the scaled-down basket model. A tipping test of the actual-size basket specimen 5 is conducted in an air test apparatus. Nine sets of simulated fuel assemblies or dummy assemblies are placed in the actual-size basket specimen 5 to simulate actual engineering conditions. The tipping device 7 is an electrically controlled, cordless release device with a maximum load capable of encompassing the weight of the actual-size basket specimen and its assemblies.

[0042] By applying the above-described technical solution of the present invention, at least the following technical effects are achieved: 1. The suspended basket overturning test method proposed in this invention provides data input for the overturning test of the actual size suspended basket specimen in air by conducting an underwater overturning test on a scale model of the suspended basket. The overturning test of the actual size suspended basket specimen in air is used to simulate the process of the suspended basket overturning underwater, thus getting rid of the constraints of test conditions and saving test costs.

[0043] 2. The basket overturning test system proposed in this invention can implement the basket overturning test method described above and obtain test data for conducting safety analysis of spent fuel storage and transportation baskets.

[0044] Example 2

[0045] According to one aspect of the present invention, a method for a suspended basket overturning test is provided, comprising: conducting an underwater overturning test on a scaled-down model 2 of the suspended basket; calculating the first energy loss due to water resistance during the process of the scaled-down model 2 freely overturning from its theoretical overturning posture to its post-overturning posture; calculating the second energy loss due to water resistance during the process of the actual-sized suspended basket specimen 5 underwater from its theoretical overturning posture to its post-overturning posture; using the second energy loss as the energy loss of the actual-sized suspended basket specimen 5 in air from its theoretical overturning posture to its initial test posture, calculating the position parameters corresponding to the actual-sized suspended basket specimen 5 when it is in the initial test posture; and using the initial test posture as the initial state of the actual-sized suspended basket specimen 5 overturning in air, conducting an overturning test on the actual-sized suspended basket specimen 5 in air.

[0046] Specifically, based on the test data obtained from the underwater test of the proportional model of the basket, the first energy loss due to water resistance during the process of the proportional model of the basket freely tilting from the theoretical tilting posture to the tilted posture is calculated. Then, based on the proportional relationship, the second energy loss due to water resistance during the process of the actual size basket specimen 5 tilting underwater from the theoretical tilting posture to the tilted posture is calculated. The second energy loss is used as the energy loss of the actual size basket specimen 5 in air from the theoretical tilting posture to the initial experimental posture, that is, the energy lost by the actual size basket specimen 5 in water is taken into account in the test under air environment. According to the principle of energy conservation, the position corresponding to the actual size basket specimen 5 in the initial experimental posture is calculated, that is, the position parameters corresponding to the actual size basket specimen 5 in the initial experimental posture are calculated. Using the initial experimental posture as the initial state of the actual size basket specimen 5 tilting in air, the tilting test of the actual size basket specimen 5 in air is carried out. Combining the data obtained from the test, a safety analysis of the spent fuel storage and transportation basket is carried out.

[0047] The calculation of the first energy loss due to water resistance during the process of the suspended basket scale model 2 freely tilting from the theoretical tilting posture to the tilted posture also includes: calculating the kinetic energy of the suspended basket scale model 2 in water when it freely tilts from the theoretical tilting posture to the tilted posture, and calculating the potential energy difference between the theoretical tilting posture and the tilted posture in air. Specifically, the first energy loss is calculated using the following formula:

[0048] In the formula: The kinetic energy of the scaled-up basket model in water when it freely tilts from its theoretical overturning posture to its post-overturning posture. The potential energy difference between the theoretical overturning posture and the post-overturning posture of the scale model of the suspended basket in the air; This is the first energy loss; The mass of the scale model of the suspended platform; The length of the diagonal of the scale model of the suspended basket; The angular velocity of the scaled-up basket model underwater as it freely tilts from its theoretical tilting posture to its tilted posture.

[0049] The second energy loss is n times the first energy loss, where n is the mass ratio of the actual-size suspended basket specimen 5 to the scaled suspended basket model 2. This applies when the actual-size suspended basket specimen 5 and the scaled suspended basket model 2 have the same density and the center of gravity of the actual-size suspended basket specimen 5 and the scaled suspended basket model 2 are located at the same position. The The scaling ratio between the actual size suspended basket specimen 5 and the scale model 2 of the suspended basket is given.

[0050] It should be noted that the scaling ratio refers to the ratio of the corresponding side lengths of the actual-sized suspended platform specimen to the scaled-down model of the suspended platform. The mass ratio refers to the ratio of the mass of the actual-sized suspended platform specimen to the mass of the scaled-down model of the suspended platform.

[0051] Specifically, when the densities of the actual-sized suspended basket specimen 5 and the scaled suspended basket model 2 are different and / or the positions corresponding to the center of gravity of the actual-sized suspended basket specimen 5 and the scaled suspended basket model 2 are different, the second energy loss is equal to the first energy loss. n When the actual-size suspended basket specimen 5 and the scale model 2 of the suspended basket have the same density and the center of gravity of the actual-size suspended basket specimen 5 and the center of gravity of the scale model 2 of the suspended basket are at the same position, The second energy loss is equal to the first energy loss. times.

[0052] The scaling ratio between the actual-size suspended platform specimen 5 and the scaled suspended platform model 2 is 2:1. Specifically, when the actual-size suspended platform specimen 5 and the scaled suspended platform model 2 have the same density and the center of gravity of the actual-size suspended platform specimen 5 and the center of gravity of the scaled suspended platform model 2 are located at the same position, The second energy loss is equal to the first energy loss. times.

[0053] The potential energy difference between the theoretical overturning posture and the initial experimental posture of the actual-sized suspended basket specimen 5 in air is taken as the second energy loss. The position parameters corresponding to the actual-sized suspended basket specimen 5 in the initial experimental posture include the initial overturning angle, which is the angle between the axis of the actual-sized suspended basket specimen 5 and the vertical axis. Specifically, the initial overturning angle is calculated using the following formula:

[0054] In the formula: The potential energy difference between the actual size suspended basket specimen 5 when it is in the theoretical overturning posture and the initial experimental posture; The mass of the actual-sized suspended basket specimen 5; The difference in center of gravity height between the actual size suspended basket specimen 5 and its theoretical overturning posture and the initial experimental posture; The initial overturning angle; The height of the center of gravity of the actual-sized suspended basket specimen 5 when it is in the initial experimental posture; The length of the line connecting the center of gravity of the actual-sized suspended basket specimen 5 in the initial experimental posture and its end on the horizontal plane is denoted as .

[0055] The overturning test of the actual-sized suspended basket specimen 5 in air was conducted at least twice, and the contact point of the actual-sized suspended basket specimen 5 was different in different numbers of overturning tests in air. The stiffness of the contact point of the actual-sized suspended basket specimen 5 was different in different numbers of overturning tests in air. Specifically, the overturning test of the actual-sized suspended basket specimen 5 in air was conducted twice. In one test, the contact point of the actual-sized suspended basket specimen 5 with greater stiffness collided with the part of the target surface with less stiffness, and a conservative verification evaluation of the water tank surface was performed. In the other test, the contact point of the actual-sized suspended basket specimen 5 with less stiffness collided with the part of the target surface with greater stiffness, and a conservative verification evaluation of the suspended basket was performed.

[0056] In other embodiments, the overturning test of the actual size suspended basket specimen 5 in the air may be carried out in multiple times, but each test is a collision between the strong and weak parts of the suspended basket and the target surface, that is: the part of the suspended basket with high stiffness collides with the part of the target surface with low stiffness, or the part of the suspended basket with low stiffness collides with the part of the target surface with high stiffness.

[0057] According to another aspect of the present invention, a basket overturning test system is provided. The test device is capable of performing the basket overturning test method and includes an underwater test device and an air test device. The underwater test device includes a test pool 1, a basket scale model 2, and a velocity measuring instrument 4. The velocity measuring instrument 4 is disposed on the bottom surface of the test pool 1 and is capable of measuring the velocity of the basket scale model 2 when it collides with the bottom surface of the test pool. The air test device includes a full-size basket specimen 5, a target surface 6, and an overturning device 7. The target surface 6 is placed horizontally, and the overturning device 7 is capable of allowing the full-size basket specimen 5 to freely overturn at different angles from the vertical axis and collide with the target surface 6.

[0058] Specifically, such as Figure 1-3As shown, an underwater test of the scaled-down basket model is conducted in the underwater test apparatus. The top of the scaled-down basket model is marked with the identification and capture point of the velocity measuring instrument 4. The scaled-down basket model is placed above the bottom of the test pool, and the velocity measuring instrument 4 is located on one side of the top of the scaled-down basket model after it has tipped over. The scaled-down basket model is manually adjusted to its theoretical tipping posture, and then allowed to tip freely. At the instant the top of the scaled-down basket model contacts the bottom of the test pool, the velocity measuring instrument 4 calculates the velocity of the scaled-down basket model at the moment of contact with the bottom by capturing the identification and capture point on the top of the scaled-down basket model. A tipping test of the actual-size basket specimen 5 is conducted in an air test apparatus. Nine sets of simulated fuel assemblies or dummy assemblies are placed in the actual-size basket specimen 5 to simulate actual engineering conditions. The tipping device 7 is an electrically controlled, cordless release device with a maximum load capable of encompassing the weight of the actual-size basket specimen and its assemblies. In the overturning test of the actual size basket specimen 5 in the air, the actual size basket specimen 5 is hoisted to one end of the target surface and adjusted to the initial test posture. The overturning device 7 releases the actual size basket specimen 5, and the actual size basket specimen 5 falls freely onto the target surface. The same steps are repeated for the above two tests. Based on the measured data, a safety analysis of the spent fuel storage and transportation basket is carried out.

[0059] The depth of the test pool 1 is 1.2 to 2 times the diagonal length of the scale model 2 of the suspended basket, the width of the test pool 1 is 0.8 to 1.5 times the diagonal length of the scale model 2 of the suspended basket, and the length of the test pool 1 is 1.5 to 2 times the diagonal length of the scale model 2 of the suspended basket. Specifically, as... Figure 1 As shown, the depth of the test pool should be higher than that of the scale model of the suspended basket, and the length and width of the test pool should meet the space required for the overturning of the scale model of the suspended basket and the placement of the speed measuring instrument 4.

[0060] The target surface 6 includes a concrete section 11 and a keel section 12, both located on the same side of the actual-size suspended platform specimen 5, with the concrete section 11 closer to the specimen than the keel section 12. The keel section 12 includes a keel 9, a first metal plate 10, and a plaster layer 8, located below the keel 9 and the first metal plate 10. The first metal plate 10 is fixed to the surface of the plaster layer 8 by the keel 9. The actual-size suspended platform specimen 5 includes a dovetail groove 13 and a tenon 14, both located on the surface of the specimen. The stiffness of the dovetail groove 13 is less than that of the tenon 14.

[0061] Specifically, such as Figure 2-3As shown, the dovetail groove of the actual-sized suspended platform specimen 5 is struck against the concrete part 11 of the target surface. Because the dovetail groove of the actual-sized suspended platform specimen 5 has weak stiffness and the concrete part 11 of the target surface has strong stiffness, a conservative verification evaluation of the suspended platform can be performed. Next, the tenon 14 of the actual-sized suspended platform specimen 5 is struck against the keel part 12 of the target surface. Because the tenon 14 of the actual-sized suspended platform specimen has strong stiffness and the keel part 12 of the target surface has weak stiffness, a conservative verification evaluation of the pool surface can be performed.

[0062] More specifically, the suspended basket overturning test system also includes measuring instruments such as accelerometers and strain gauges. The accelerometers are used to measure the acceleration of the actual-sized suspended basket specimen 5 and components during the test, and the strain gauges are used to measure the strain generated by the actual-sized suspended basket specimen 5 during the test.

[0063] The underwater testing apparatus also includes a capsizing protection device 3, which is disposed on the bottom surface of the test pool 1. The capsizing protection device 3 includes a second metal plate and shock-absorbing material, the shock-absorbing material being disposed on the surface of the second metal plate. Specifically, as... Figure 1 As shown, the bottom of the overturning protective device is a steel plate, which sinks to the bottom of the test water tank by its weight. The upper part of the steel plate is fixed with shock-absorbing materials such as wooden boards or pearl cotton.

[0064] The speed measuring instrument 4 consists of a high-speed camera and a protective housing. The high-speed camera is located inside the protective housing, which isolates the high-speed camera from water. Specifically, as... Figure 1 As shown, the high-speed camera has the functions of high-precision speed measurement and remote control. The camera protective shell places the high-speed camera inside, forming a sealed and waterproof space.

[0065] By applying the above-described technical solution of the present invention, at least the following technical effects are achieved: 1. The suspended basket overturning test method proposed in this invention provides data input for the overturning test of the actual size suspended basket specimen in air by conducting an underwater overturning test on a scale model of the suspended basket. The overturning test of the actual size suspended basket specimen in air is used to simulate the process of the suspended basket overturning underwater, thus getting rid of the constraints of test conditions and saving test costs.

[0066] 2. The present invention provides a basket overturning test method. A basket scale model is established. Based on this model, the first energy loss due to water resistance during the process from the theoretical overturning posture to the post-overturning posture is calculated. The second energy loss of the actual-sized basket specimen in air from the critical overturning state to the post-overturning posture is then calculated. This allows for the calculation of the initial test posture of the actual-sized basket specimen in air, considering underwater energy loss. The theoretical overturning posture provides theoretical support for simulating underwater basket overturning using an actual-sized basket specimen overturning test in air.

[0067] 3. The basket overturning test method of the present invention involves at least two impacts between the actual size basket specimen and the target surface at different locations, thereby conducting conservative verification and evaluation of the actual size basket specimen and the target surface respectively.

[0068] The above are merely several specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0070] It should be noted that, in the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A method of testing a wireline basket for overturning, the method comprising: include: An underwater overturning test was conducted on the proportional model of the suspended basket (2), and the first energy loss caused by water resistance during the process of the proportional model of the suspended basket (2) from the theoretical overturning posture to the overturned posture was calculated. Calculate the second energy loss due to water resistance in the process of the actual size suspended basket specimen (5) underwater from the theoretical overturning attitude to the overturned attitude; Using the second energy loss as the energy loss of the actual size suspended basket specimen (5) in the air from the theoretical overturning posture to the initial experimental posture, calculate the position parameters corresponding to the actual size suspended basket specimen (5) when it is in the initial experimental posture; Using the initial experimental posture as the initial state of the actual size suspended basket specimen (5) in air overturning, the overturning test of the actual size suspended basket specimen (5) in air was carried out; The theoretical overturning posture refers to the starting point of the overturning process of the scale model or actual size suspended basket specimen in water or air under the action of gravity alone; the post-overturning posture refers to the stable state reached by the scale model or actual size suspended basket specimen in water or air after overturning; the initial experimental posture is the starting point of the overturning process required for the experiment reached by the actual size suspended basket specimen under the action of forces other than gravity.

2. The basket tip-over test method of claim 1, wherein, The second energy loss is n times the first energy loss, where n is the mass ratio of the actual size suspended basket specimen (5) to the suspended basket scale model (2).

3. The method for testing the overturning of the suspended platform according to claim 2, characterized in that, When the density of the actual size hanging basket test piece (5) and the hanging basket scale model (2) is the same, and the position corresponding to the center of gravity of the actual size hanging basket test piece (5) and the center of gravity of the hanging basket scale model (2) is the same, , the is the scaling ratio of the actual size hanging basket test piece (5) and the hanging basket scale model (2).

4. The method for testing the overturning of the suspended platform according to claim 3, characterized in that, The potential energy difference between the theoretical overturning posture and the initial experimental posture of the actual size suspended basket specimen (5) in the air is taken as the second energy loss.

5. The method for testing the overturning of the suspended platform according to claim 4, characterized in that, The position parameters corresponding to the actual size suspended basket specimen (5) when it is in the initial posture of the test include the initial overturning angle, which is the angle between the axis of the actual size suspended basket specimen (5) and the vertical axis.

6. The method for testing the overturning of the suspended platform according to claim 5, characterized in that, The initial overturning angle is calculated using the following formula. In the formula: The potential energy difference between the actual size suspended basket specimen (5) in the theoretical overturning posture and the initial experimental posture; The mass of the actual-sized suspended basket specimen (5); The difference in center of gravity height between the actual size suspended basket specimen (5) and the theoretical overturning posture and the initial experimental posture, respectively; The initial overturning angle; The height of the center of gravity of the actual size suspended basket specimen (5) when it is in the initial experimental posture; The length of the line connecting the center of gravity of the actual size suspended basket specimen (5) in the initial experimental posture and its end on the horizontal plane.

7. The method for testing the overturning of the suspended platform according to claim 6, characterized in that, The actual size suspended basket specimen (5) was subjected to an overturning test in air at least twice, and the contact point of the actual size suspended basket specimen (5) was different in different overturning tests in air.

8. The method for testing the overturning of the suspended platform according to claim 7, characterized in that, The stiffness of the actual-size suspended basket specimen (5) at the contact point differed in different overturning tests in air.

9. The method for testing the overturning of the suspended platform according to claim 7, characterized in that, The calculation of the first energy loss due to water resistance during the process of the suspended basket scale model (2) from the theoretical overturning posture to the post-overturning posture also includes: Calculate the kinetic energy of the basket scale model (2) in water when it freely tilts from the theoretical tilting posture to the tilted posture, and calculate the potential energy difference between the theoretical tilting posture and the tilted posture of the basket scale model (2) in air.

10. The method for testing the overturning of the suspended platform according to claim 9, characterized in that, The first energy loss is calculated using the following formula: In the formula: The kinetic energy of the proportional model of the hanging basket (2) when it freely tilts from the theoretical overturning posture to the overturned posture in the water; The potential energy difference between the theoretical overturning posture and the post-overturning posture of the suspended basket proportional model (2) in the air; This is the first energy loss; The mass of the scale model (2) of the suspended basket; The length of the diagonal of the scale model (2) of the suspended basket; Let ω be the angular velocity of the scale model (2) of the basket when it is freely tilted from the theoretical tilting posture to the tilting posture underwater.

11. The method for testing the overturning of the suspended platform according to claim 10, characterized in that, The scaling ratio between the actual size suspended basket specimen (5) and the scale model (2) of the suspended basket is 2:

1.

12. A suspended platform overturning test system, said test system being capable of performing the suspended platform overturning test method according to any one of claims 1-11, characterized in that, Including underwater testing equipment and air testing equipment, The underwater test device includes a test pool (1), a basket scale model (2), and a speed measuring instrument (4). The speed measuring instrument (4) is installed on the bottom surface of the test pool (1) and can measure the speed of the basket scale model (2) when it collides with the bottom surface of the test pool. The air test device includes a full-size basket specimen (5), a target surface (6) and a tilting device (7). The target surface (6) is placed horizontally, and the tilting device (7) enables the full-size basket specimen (5) to tilt freely at different angles from the vertical axis and collide with the target surface (6).

13. The suspended basket overturning test system according to claim 12, characterized in that, The depth of the test pool (1) is 1.2 to 2 times the diagonal length of the suspended basket scale model (2), the width of the test pool (1) is 0.8 to 1.5 times the diagonal length of the suspended basket scale model (2), and the length of the test pool (1) is 1.5 to 2 times the diagonal length of the suspended basket scale model (2).

14. The suspended basket overturning test system according to claim 13, characterized in that, The target surface (6) includes a concrete part (11) and a keel part (12), both of which are located on the same side of the actual size suspended basket specimen (5), with the concrete part (11) being closer to the actual size suspended basket specimen (5) than the keel part (12).

15. The suspended basket overturning test system according to claim 14, characterized in that, The keel part (12) includes a keel (9), a first metal plate (10) and a plaster layer (8). The plaster layer (8) is located below the keel (9) and the first metal plate (10). The first metal plate (10) is fixed to the surface of the plaster layer (8) by the keel (9).

16. The suspended basket overturning test system according to claim 15, characterized in that, The actual size suspended basket specimen (5) includes a dovetail groove (13) and a tenon (14). The dovetail groove (13) and the tenon (14) are both located on the surface of the actual size suspended basket specimen (5). The stiffness of the dovetail groove (13) is less than the stiffness of the tenon (14).

17. The suspended basket overturning test system according to claim 16, characterized in that, The underwater test device also includes an overturning protection device (3), which is installed on the bottom surface of the test pool (1).

18. The suspended basket overturning test system according to claim 17, characterized in that, The overturning protection device (3) includes a second metal plate and a shock-absorbing material, wherein the shock-absorbing material is disposed on the surface of the second metal plate.

19. The suspended basket overturning test system according to claim 18, characterized in that, The speed measuring instrument (4) is a high-speed camera and a camera protective shell. The high-speed camera is located inside the camera protective shell, and the camera protective shell can isolate the high-speed camera from water.

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