Impact performance test device for flexible pipe and design method thereof

Abstract

The present invention proposes an impact performance test device for a flexible pipe and a design method thereof. The design method for the impact performance test device for a flexible pipe comprises the following steps: installing the impact performance test device according to the equivalent post-installation frequency. f 1 and the frequency of installation of actual ship equipment f 0 is consistent with the principle of equivalence, determining the quality of the simulation equipment m 1 and the stiffness of the vibration isolator below the simulated device k 1. Determine the pipe counterweight in the impact performance test device m 2. According to the installation frequency of the equivalent pipeline foot and the installation frequency of the actual ship pipeline foot f 2. Maintain consistency as the principle and determine the stiffness of the pipeline foot isolator k 2. The design method proposed in the present invention considers the equivalence of the flexible nozzle to the actual ship boundary, thereby facilitating the support and verification of the impact resistance performance test of the flexible nozzle, thereby improving the accuracy of the flexible nozzle impact resistance test.

Description

Technical Field

[0001] The present invention relates to the technical field of ship impact performance testing, and in particular to an impact performance testing device for a flexible pipe and a design method thereof. Background Art

[0002] Flexible pipes are typically installed in piping systems to absorb displacement caused by various forces. They are essential to ensure reliable operation of equipment and piping and extend their service life. When a ship is subjected to impact, flexible pipes are affected by the connected equipment, causing significant deformation. Failure of flexible pipes under impact can cause malfunction of the piping system, ultimately leading to functional failure of the corresponding equipment or system. Therefore, testing and verifying the impact resistance of flexible pipes during impact is essential.

[0003] Currently, there are relatively clear test standards for impact assessment of marine equipment, and test platforms such as drop hammer and pendulum impact machines have been developed. However, due to the limited load capacity of impact machines, onshore impact testing of flexible pipes requires simplifying boundary conditions such as the equipment connected to the flexible pipes and the presence of faults. This can easily lead to inconsistencies between the impact environment of the flexible pipes and the actual installation conditions on board, resulting in under- or over-assessment of the impact resistance. Summary of the Invention

[0004] The main purpose of the present invention is to provide an impact performance test device for a flexible connecting pipe and a design method thereof, aiming to improve the accuracy of the impact resistance test of the flexible connecting pipe.

[0005] To achieve the above-mentioned object, the present invention provides a method for designing an impact performance test device for a flexible pipe, comprising the following steps:

[0006] According to the installation frequency of the equivalent post-impact performance test device f 1 and the frequency of installation of actual ship equipment f 0 is consistent with the principle of equivalence, determining the quality of the simulation equipment m 1 and the stiffness of the vibration isolator below the simulated device k 1;

[0007] Determining the Pipeline Counterweight in an Impact Performance Test Device m 2;

[0008] According to the installation frequency of the equivalent pipeline foot and the installation frequency of the actual ship pipeline foot f 2. Maintain consistency as the principle and determine the stiffness of the pipeline foot isolator k 2.

[0009] Preferably, the quality of the simulation equipment is determined according to the load-bearing capacity of the impact machine test m 1.

[0010] Preferably, the quality of the simulation equipment is determined according to the load-bearing capacity of the impact machine test m 1 Specifically include:

[0011] m 1 is 0.4 ( m 3 / m 0) and 0.6 ( m 3 / m 0),

[0012] in, m 3 is the maximum load-bearing mass of the impact machine m 3. m 0 is the quality of the simulated device.

[0013] Preferably, determine the stiffness of the vibration isolator below the simulation device k 1, first determine the quality of the simulation equipment m 1 and known installation frequency of actual ship equipment f 0, and then calculate with the following formula:

[0014] .

[0015] Preferably, when determining the stiffness of the pipeline isolator k 2, the stiffness of a single vibration isolator is determined according to the number of vibration isolators.

[0016] Preferably, determine the stiffness of the pipeline foot isolator k 2, the following formula is used:

[0017] .

[0018] Preferably, according to the stiffness of the pipeline foot isolator k 2Determine the stiffness of a single isolator.

[0019] Preferably, the pipeline counterweight in the impact performance test device is determined based on the actual ship pipeline foot design load m 2.

[0020] Preferably, the load capacity is designed according to the actual ship pipeline m 4. Determine the pipe weight in the impact performance test device m 2 Specifically include:

[0021] m 2 in 0.6 m 4 to 0.8 m 4, among which, m 4 is the actual ship pipeline foot design load.

[0022] The present invention further provides an impact performance test device for a flexible connecting pipe, which is manufactured using the above-mentioned design method for the impact performance test device for a flexible connecting pipe.

[0023] The design method of the impact performance test device for flexible pipes proposed in the present invention has the following beneficial effects:

[0024] 1. This design method is simple and easy to operate, and the various dimensional parameters of the impact performance test device obtained are reasonably designed;

[0025] 2. An impact test method considering the equivalence of the flexible nozzle to the actual ship boundary is provided, which facilitates the support of the flexible nozzle impact resistance performance test verification, thereby improving the accuracy of the flexible nozzle impact resistance test. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the flow of the design method of the impact performance test device for flexible pipes of the present invention;

[0027] Figure 2 A schematic structural diagram of an impact performance test device produced according to a first embodiment of a design method for an impact performance test device for a flexible pipe according to the present invention;

[0028] Figure 3 This is a comparison chart of the test results of the impact performance test device produced by the first embodiment of the design method of the impact performance test device for the flexible connecting pipe of the present invention, and the test results of the actual ship test and the land impact test.

[0029] In the figure, 1-simulation equipment, 2-vibration isolator under the simulation equipment, 3-flexible pipe, 4-pipeline counterweight, 5-pipeline horse foot vibration isolator, 6-impact machine table.

[0030] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0031] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] The invention provides a design method for an impact performance test device for a flexible connecting pipe.

[0033] Reference Figures 1 to 3 The present invention provides a first embodiment of a method for designing an impact performance test device for a flexible pipe. In this embodiment, a method for designing an impact performance test device for a flexible pipe includes the following steps:

[0034] Step S10, according to the installation frequency of the equivalent rear impact performance test device f1 and the frequency of installation of actual ship equipment f 0 is consistent with the equivalence principle, determining the quality of the simulated device 1 m 1 and the stiffness of the vibration isolator 2 below the simulated device k 1;

[0035] Step S20: Determine the pipe counterweight in the impact performance test device m 2;

[0036] Step S30: According to the installation frequency of the equivalent pipeline protrusion and the installation frequency of the actual ship pipeline protrusion f 2. Keep consistency as the principle and determine the stiffness of the pipeline foot isolator 5 k 2.

[0037] Specifically, in step S10, the quality of the impact performance test device is determined according to the impact machine test load capacity. m 1.

[0038] Determine the mass of the simulation device 1 according to the impact machine test load capacity m 1 Specifically include:

[0039] m 1 is 0.4 ( m 3 / m 0) and 0.6 ( m 3 / m 0),

[0040] in, m 3 is the maximum load-bearing mass of the impact machine m 3. m 0 is the quality of the simulated device.

[0041] Determine the stiffness of the vibration isolator 2 below the simulated device k 1, first determine the quality of the simulation device 1 m 1 and known installation frequency of actual ship equipment f 0, and then calculate with the following formula:

[0042] .

[0043] In step S10, the stiffness of the pipeline vibration isolator 5 is determined. k 2, the stiffness of a single vibration isolator is determined according to the number of vibration isolators.

[0044] In step S20, the pipeline counterweight in the impact performance test device is determined according to the actual ship pipeline design load. m 2.

[0045] Determine the pipe counterweight in the impact performance test device based on the actual ship pipeline foot design load m 2 Specifically include:

[0046] m 2 in 0.6 m 4 to 0.8 m 4, among which, m 4 is the actual ship pipeline foot design load.

[0047] In step S30, the stiffness of the pipeline vibration isolator 5 is determined. k 2, the following formula is used:

[0048] .

[0049] According to the pipeline foot vibration isolator 5 stiffness k 2Determine the stiffness of a single isolator.

[0050] After determining the various parameters of the impact performance test device, the device was fabricated. Finally, the flexible pipe 3, the simulator 1, and the pipeline pins were mounted on the impact tester table. Displacement sensors, accelerometers, and other sensors were installed at the required measurement locations based on test requirements. The impact test on the flexible pipe 3 was then carried out according to the test requirements.

[0051] The impact performance test device proposed in this embodiment is used to compare the test results of the actual ship and the impact test results on land. Figure 3 As shown in the figure, the test results show that the peak value error of the impact displacement between the actual ship test and the land test is ≤10%. This shows that the dimensions determined by this design method can effectively simulate the impact displacement boundary conditions of the flexible nozzle 3 in the actual ship installation state on the land impact machine.

[0052] The design method of the impact performance test device for flexible pipes proposed in the present invention has the following beneficial effects:

[0053] 1. This design method is simple and easy to operate, and the various dimensional parameters of the impact performance test device obtained are reasonably designed;

[0054] 2. An impact test method considering the equivalence of the flexible nozzle 3 to the actual ship boundary is provided, thereby facilitating the support of the impact resistance performance test verification of the flexible nozzle 3, thereby improving the accuracy of the impact resistance test of the flexible nozzle 3.

[0055] The present invention further provides an impact performance testing device for a flexible connecting pipe.

[0056] The present invention provides an impact performance test device for a flexible pipe, which is manufactured using the above-mentioned design method for the impact performance test device for a flexible pipe. The specific steps and beneficial effects of the design method for the impact performance test device for a flexible pipe are referred to the above-mentioned embodiment.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied to other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A design method for an impact performance test device for a flexible pipe, characterized in that: The following steps are involved: According to the installation frequency of the equivalent post-impact performance test device f 1 and the frequency of installation of actual ship equipment f 0 is consistent with the principle of equivalence, determining the quality of the simulation equipment m 1 and the stiffness of the vibration isolator below the simulated device k 1; Determining the Pipeline Counterweight in an Impact Performance Test Device m 2; According to the installation frequency of the equivalent pipeline foot and the installation frequency of the actual ship pipeline foot f 2. Maintain consistency as the principle and determine the stiffness of the pipeline foot isolator k 2; Determine the stiffness of the vibration isolators below the simulated equipment k 1, first determine the quality of the simulation equipment m 1 and known installation frequency of actual ship equipment f 0, and then calculate with the following formula: ； Determine the stiffness of the pipeline foot isolator k 2, the following formula is used: 。 2. The design method for the impact performance test device for flexible pipe according to claim 1, characterized in that: Determine the quality of the simulation equipment based on the impact machine test load capacity m 1.

3. The design method for the impact performance test device for flexible pipe according to claim 1, characterized in that: Determine the quality of the simulation equipment based on the impact machine test load capacity m 1 Specifically include: m 1 is 0.4 ( m 3 / m 0) and 0.6 ( m 3 / m 0), in, m 3 is the maximum load-bearing mass of the impact machine, m 0 is the quality of the simulated device.

4. The design method for the impact performance test device for flexible pipe according to claim 1, characterized in that: In determining the stiffness of the pipeline foot isolator k 2, the stiffness of a single vibration isolator is determined according to the number of vibration isolators.

5. The design method for the impact performance test device for flexible pipe according to claim 1, characterized in that: According to the stiffness of the pipeline foot isolator k 2Determine the stiffness of a single isolator.

6. The method for designing an impact performance test device for a flexible pipe according to any one of claims 1 to 5, characterized in that: Determine the pipe counterweight in the impact performance test device based on the actual ship pipeline foot design load m 2.

7. The design method for the impact performance test device for a flexible pipe according to claim 6, characterized in that: Determine the pipe counterweight in the impact performance test device based on the actual ship pipeline foot design load m 2 Specifically include: m 2 in 0.6 m 4 to 0.8 m 4, among which, m 4 is the actual ship pipeline foot design load.

8. An impact performance test device for flexible pipes, characterized in that: The device is manufactured by adopting the design method of the impact performance test device for flexible connecting pipes as claimed in any one of claims 1 to 7.

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