Impact performance testing device for flexible connecting pipe and design method of impact performance testing device

Abstract

The invention provides an impact performance testing device for a flexible connecting pipe and a design method of the impact performance testing device. The design method of the impact performance test device for the flexible connecting pipe comprises the following steps: determining the mass m1 of simulation equipment and the rigidity k1 of a vibration isolator below the simulation equipment according to the principle that the mounting frequency f1 of the impact performance test device after equivalence and the mounting frequency f0 of real ship equipment are consistent as an equivalence principle; determining a pipeline counterweight m2 in the impact performance test device; and determining the rigidity k2 of the pipeline horse foot vibration isolator according to the principle that the mounting frequency of the pipeline horse foot after equivalence is consistent with the mounting frequency f2 of the pipeline horse foot of the real ship. According to the design method provided by the invention, the real ship boundary equivalence of the flexible connecting pipe is considered, so that the impact resistance test verification of the flexible connecting pipe is conveniently supported, and the accuracy of the impact resistance test of the flexible connecting pipe is improved.

Description

Technical Field

[0001] The 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 usually installed on the piping system to absorb the displacement caused by various effects on the piping system. Flexible pipes must be installed to ensure the reliable operation of equipment pipelines and extend their service life. When a ship is subjected to impact, the flexible pipe is affected by the connected equipment and will produce a large impact deformation. The failure of the flexible pipe under the impact will cause the failure of the piping system in which it is located, and ultimately lead to the failure of the corresponding equipment or system function. Therefore, it is very necessary to test and verify the impact resistance of the flexible pipe during the impact process.

[0003] At present, there are relatively clear test standards for the impact assessment of marine equipment, and test platforms such as drop hammer and pendulum impact machines have been developed. For the onshore impact test of flexible pipes, due to the limited bearing capacity of the impact machine, it is necessary to simplify the boundary conditions such as the equipment connected to the flexible pipes and the feet during the test, which can easily lead to the inconsistency between the impact environment of the flexible pipes and the actual ship installation status, resulting in insufficient 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 pipe and a design method thereof, aiming to improve the accuracy of the impact resistance test of the flexible pipe.

[0005] To achieve the above object, the present invention provides a design method for an impact performance test device for a flexible pipe, comprising the following steps: 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 pipe weight 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. Keep consistency as the principle and determine the stiffness of the pipeline vibration isolator k 2.

[0006] Preferably, the quality of the simulation equipment is determined according to the load-bearing capacity of the impact machine test. m 1.

[0007] Preferably, the quality of the simulation equipment is determined according to the load-bearing capacity of the impact machine test.m 1Specifically 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 3. m 0 is the quality of the simulated device.

[0008] Preferably, determine the stiffness of the vibration isolator below the simulated 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: .

[0009] Preferably, when determining the stiffness of the pipeline isolator k 2, the stiffness of a single isolator is determined according to the number of isolators.

[0010] Preferably, determine the stiffness of the pipeline foot isolator k 2, the following formula is used: .

[0011] Preferably, according to the stiffness of the pipeline foot isolator k 2Determine the stiffness of a single isolator.

[0012] Preferably, the pipeline counterweight in the impact performance test device is determined according to the actual ship pipeline design load. m 2.

[0013] 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: m 2 in 0.6 m 4 to 0.8 m 4, among which, m 4 is the actual ship pipeline foot design load.

[0014] 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.

[0015] The design method of the impact performance test device for flexible pipes proposed by the present invention has the following beneficial effects: 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; 2. An impact test method considering the equivalence of the flexible nozzle to the actual ship boundary is provided, so as to facilitate the test verification of the impact resistance performance of the flexible nozzle and improve the accuracy of the impact resistance test of the flexible nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of a design method of an impact performance test device for a flexible pipe according to the present invention; Figure 2 A schematic diagram of the structure of an impact performance test device produced by a first embodiment of a design method for an impact performance test device for a flexible pipe according to the present invention; Figure 3 This is a comparison chart of the test results of the impact performance test device made by the first embodiment of the design method of the impact performance test device for the flexible pipe of the present invention, and the test results of the actual ship test and the onshore impact test.

[0017] In the figure, 1-simulation equipment, 2-vibration isolator under the simulation equipment, 3-flexible connecting pipe, 4-pipeline counterweight, 5-pipeline horse foot vibration isolator, 6-impact machine table.

[0018] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0020] The invention provides a design method for an impact performance test device for a flexible connecting pipe.

[0021] Reference Figures 1 to 3 The present invention proposes a first embodiment of a design method for an impact performance test device for a flexible pipe. In this embodiment, a design method for an impact performance test device for a flexible pipe includes the following steps: Step S10, according to the installation frequency of the equivalent rear impact performance test device f 1 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 2 stiffness of vibration isolator under simulated equipment k 1; Step S20, determining the pipeline counterweight in the impact performance test device m 2; Step S30: according to the installation frequency of the equivalent pipeline foot and the installation frequency of the actual ship pipeline foot f2 Keep consistency as the principle and determine the stiffness of the pipeline foot isolator 5 k 2.

[0022] Specifically, in step S10, the quality of the impact performance test device is determined according to the impact machine test load capacity. m 1.

[0023] Determine the mass of the simulation device 1 according to 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 3. m 0 is the quality of the simulated device.

[0024] Determine the stiffness of the vibration isolator 2 below the simulated device k 1, first determine the quality of the simulated device 1 m 1 and known installation frequency of actual ship equipment f 0, and then calculate with the following formula: .

[0025] In step S10, the stiffness of the pipeline vibration isolator 5 is determined. k 2, the stiffness of a single isolator is determined according to the number of isolators.

[0026] In step S20, the pipeline counterweight in the impact performance test device is determined according to the actual ship pipeline design load. m 2.

[0027] Determine the pipeline 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.

[0028] In step S30, the stiffness of the pipeline vibration isolator 5 is determined. k 2, the following formula is used: .

[0029] According to the pipeline foot vibration isolator 5 stiffness k 2Determine the stiffness of a single isolator.

[0030] After determining the parameters of the impact performance test device, the device is manufactured. Finally, the flexible pipe 3, the simulation device 1, the pipeline feet, etc. are installed on the impact machine table. At the same time, according to the test requirements, the displacement sensor, the acceleration sensor, etc. are installed at the position where the measurement is required. According to the test requirements, the impact test of the flexible pipe 3 is carried out.

[0031] The impact performance test device proposed in this embodiment is used to compare the test results of the actual ship with the test results of the land impact test. Figure 3 As shown, 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 size 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.

[0032] The design method of the impact performance test device for flexible pipes proposed by the present invention has the following beneficial effects: 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; 2. An impact test method considering the equivalence of the flexible pipe 3 to the actual ship boundary is provided, so as to facilitate the test verification of the impact resistance performance of the flexible pipe 3, thereby improving the accuracy of the impact resistance test of the flexible pipe 3.

[0033] The present invention further provides an impact performance testing device for a flexible pipe.

[0034] The present invention provides an impact performance test device for a flexible pipe, which is manufactured by using the 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 refer to the above embodiment.

[0035] 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 specification and drawings, or directly or indirectly applied in 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 pipe weight 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. Keep consistency as the principle and determine the stiffness of the pipeline vibration isolator k 2.

2. The design method of the impact performance test device for a 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 of the impact performance test device for a 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 1Specifically 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 3. m 0 is the quality of the simulated device.

4. The design method for the impact performance test device for a flexible pipe according to claim 1, characterized in that: 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: 。 5. The design method for the impact performance test device for a flexible pipe according to claim 1, characterized in that: In determining the stiffness of the pipeline isolator k 2, the stiffness of a single isolator is determined according to the number of isolators.

6. The design method for the impact performance test device for a flexible pipe according to claim 1, characterized in that: Determine the stiffness of the pipeline foot isolator k 2, the following formula is used: 。 7. The design method for the impact performance test device for a 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.

8. The design method for the impact performance test device for a flexible pipe according to any one of claims 1 to 7, characterized in that: Determine the pipeline counterweight in the impact performance test device based on the actual ship pipeline foot design load m 2.

9. The design method for the impact performance test device for the flexible pipe according to claim 8, characterized in that: Determine the pipeline 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.

10. An impact performance test device for a flexible pipe, characterized in that: The device is manufactured by adopting the design method of the impact performance test device for the flexible pipe as described in any one of claims 1 to 9.

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