A marine cable vibration noise transmission characteristic test bench and a test method

Abstract

The present application relates to the technical field of marine cable testing, in particular to a marine cable vibration noise transmission characteristic test bench and a test method. The marine cable vibration noise transmission characteristic test bench and the test method can test the vibration noise transmission characteristics of various types of cables under different installation forms, can simulate the actual working environment of marine cables, have a wide range of applications, and the test results are accurate. The test bench and the test method provide a test scheme for the vibration noise transmission characteristics of marine cables and technical support for further reducing the vibration noise transmission of marine cables and forming an optimized cable arrangement scheme.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine cable testing, in particular to a marine cable vibration noise transmission characteristic test bench and a test method. BACKGROUND

[0002] The underwater vehicle has a high requirement for concealment in the submerged state, and related technical means need to be used to attenuate the vibration noise in the operation process. The cable is an important device for realizing power transmission, and also causes the vibration noise of the connected device to be transmitted to the ship structure. Research and analysis of the vibration noise transmission characteristics of the cable are of great significance for optimizing the cable arrangement and improving the vibration and noise reduction effect of the cable.

[0003] The vibration noise transmission characteristic test method of the cable in the prior art cannot simulate the real working environment of the marine cable, and the test working condition is single, so the reference of the test result is not great. SUMMARY

[0004] The technical problem to be solved by the present application is that, in view of the deficiencies of the prior art, a marine cable vibration noise transmission characteristic test bench and test method are provided, which can test the vibration noise transmission characteristics of various types of cables under different installation forms, and can simulate the real working environment of the marine cable, and have a wide range of applications.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is:

[0006] A marine cable vibration noise transmission characteristic test bench, comprising a bench deck 1, a plurality of support columns 2 are installed on the lower surface of the bench deck 1, a cable clamp 3 for fixing a cable to be tested 8 is installed on the upper surface of the bench deck 1, one end of the cable to be tested 8 is connected to a vibration excitation source 4, the vibration excitation source 4 is provided with a plurality of vibration output gears, the vibration excitation source 4 is fixed on an excitation source support table 5, a plurality of preset test points are provided on the cable to be tested 8, and a vibration sensor 6 is installed at each test point; the support column 2 and the excitation source support table 5 are both up-down telescopic adjustable structures, and the vibration excitation source 4 and the vibration sensor 6 are electrically connected to a signal processor 7.

[0007] Further, n rows of cable clamps 3 are installed on the upper surface of the bench deck 1, where n>=3, the cable clamps 3 in the first row to the n-1th row have different installation spacings, and the installation spacing of the cable clamps 3 in the nth row and the first row is the same.

[0008] Further, the cable clamps 3 in the first row to the n-1th row are welded and fixed to the upper surface of the bench deck 1; the cable clamps 3 in the nth row are fixedly connected to a vibration isolator through bolts, and the vibration isolator is fixedly connected to the bench deck 1.

[0009] Further, the plurality of vibration output gears specifically includes a sine excitation output gear and a plurality of analog excitation output gears, and the plurality of analog excitation output gears are respectively consistent with actual vibration excitation signals of the plurality of marine power supplies.

[0010] Further, the support height of the excitation source support table 5 is consistent with the actual installation height of the marine power supply.

[0011] Further, the to-be-tested cable 8 is externally provided with a cable skin and internally provided with a cable inner core, and the vibration excitation source 4 is connected with the cable inner core.

[0012] Further, the rack slab 1 is specifically in a rectangular structure, and the plurality of support columns 2 are uniformly arranged along each side of the lower surface of the rack slab 1.

[0013] Based on the same inventive concept, the application further provides a marine cable vibration noise transmission characteristic test method, which is based on the test rack as described above and specifically includes the following steps:

[0014] S1, test condition one: keeping the support height of the excitation source support table unchanged, setting the vibration excitation source to the sine excitation output gear, then fixing the to-be-tested cable in the cable clamps in the first column to the n-1th column in turn, and collecting the excitation source signals and the vibration sensor signals under this condition through the signal processor to generate the cable vibration modal parameters under condition one;

[0015] S2, test condition two: keeping the to-be-tested cable fixed in the cable clamp in the first column, setting the vibration excitation source to the sine excitation output gear, then adjusting the excitation source support table to different heights in turn, and collecting the excitation source signals and the vibration sensor signals under this condition through the signal processor to generate the cable vibration modal parameters under condition two;

[0016] S3, test condition three: keeping the support height of the excitation source support table unchanged and keeping the to-be-tested cable fixed in the cable clamp in the first column, then setting the vibration excitation source to different analog excitation output gears in turn, and collecting the excitation source signals and the vibration sensor signals under this condition through the signal processor to generate the cable vibration modal parameters under condition three;

[0017] S4, test condition four: keeping the support height of the excitation source support table unchanged and keeping the to-be-tested cable fixed in the cable clamp in the first column, setting the vibration excitation source to the sine excitation output gear, then respectively installing the vibration sensors at the same positions of the cable skin and the cable inner core, and collecting the excitation source signals and the vibration sensor signals under this condition through the signal processor to generate the cable vibration modal parameters under condition four;

[0018] S5, test working condition five: keep the support height of the excitation source support table unchanged, and set the vibration excitation source as a sine excitation output gear, then fix the cable to be tested in the cable clamps of the first column and the nth column respectively, and collect the excitation source signals and the vibration sensor signals under this working condition through the signal processor to generate the working condition five cable vibration modal parameters;

[0019] S6, different types of cables are used in turn, and steps S1-S4 are repeatedly executed to analyze the influence of different cable types on the vibration noise transmission characteristics of the marine cable under each working condition.

[0020] The working condition one cable vibration modal parameters are used to analyze the influence of different cable clamp installation spacings on the vibration noise transmission characteristics of the marine cable.

[0021] The working condition two cable vibration modal parameters are used to analyze the influence of different excitation source heights on the vibration noise transmission characteristics of the marine cable.

[0022] The working condition three cable vibration modal parameters are used to analyze the influence of different marine power vibration excitation signals on the vibration noise transmission characteristics of the marine cable.

[0023] The working condition four cable vibration modal parameters are used to analyze the influence of the cable skin on the vibration noise transmission characteristics of the marine cable.

[0024] The working condition five cable vibration modal parameters are used to analyze the influence of the added vibration isolator on the vibration noise transmission characteristics of the marine cable.

[0025] Further, the cable vibration modal parameters include the natural frequency, damping ratio, modal shape, modal stiffness and modal damping of the cable to be tested.

[0026] Compared with the prior art, the present application has the following main advantages:

[0027] 1. The marine cable vibration noise transmission characteristic test bench and test method provided by the present application can test the vibration noise transmission characteristics of various types of cables under different installation forms by setting cable clamps with various installation forms on the bench plate, in combination with controllable excitation sources, adjustable support columns, vibration sensors, signal processors and other devices, can simulate the actual working environment of marine cables, has a wide range of applications, and the test results are accurate.

[0028] 2. The present application can flexibly adjust the arrangement of the test bench and the cable clamps for cables with different installation methods, and can simulate the cable vibration noise transmission characteristic test under the actual installation state.

[0029] 3. By adjusting the placement of sensors, the present invention can perform relevant tests on single cables or even cables laid in bundles, thereby obtaining the impact of different cable forms on the vibration and noise transmission characteristics of the cables;

[0030] 4. The present invention simulates the actual marine power supply vibration excitation signal by adjusting the vibration excitation source, and can obtain the influence of different marine power supplies on the cable vibration noise transfer characteristics;

[0031] 5. The test bench and test method for the vibration and noise transfer characteristics of marine cables proposed in this invention provide a bench solution and a test solution for the vibration and noise transfer characteristics of marine cables, and provide technical support for further reducing the vibration and noise transfer of marine cables and forming an optimized cable layout solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of a test bench for vibration and noise transfer characteristics of marine cables in an embodiment of the present invention;

[0033] Figure 2 The figure is a flow chart of a method for testing the vibration and noise transfer characteristics of a shipboard cable in an embodiment of the present invention.

[0034] In the figure: 1. Test bench deck; 2. Support column; 3. Cable hook; 4. Vibration excitation source; 5. Excitation source support platform; 6. Vibration sensor; 7. Signal processor; 8. Cable to be tested. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0036] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, or two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0037] Example 1, as Figure 1 As shown, this embodiment provides a test bench for vibration and noise transfer characteristics of marine cables, including a bench deck 1, a support column 2, a cable hook 3, a vibration excitation source 4, an excitation source support platform 5, a vibration sensor 6 and a signal processor 7.

[0038] Among them, a plurality of support columns 2 are installed on the lower surface of the platform deck 1, and a cable tightening hook 3 for fixing the cable to be tested 8 is installed on the upper surface of the platform deck 1. One end of the cable to be tested 8 is connected to the vibration excitation source 4, and the vibration excitation source 4 is provided with a plurality of vibration output gears. The vibration excitation source 4 is fixed on the excitation source support platform 5. The cable to be tested 8 is provided with a plurality of preset test points, and each test point is equipped with a vibration sensor 6; the support columns 2 and the excitation source support platform 5 are both adjustable structures that can be telescoped up and down, and the vibration excitation source 4 and the vibration sensor 6 are both electrically connected to the signal processor 7.

[0039] Furthermore, n rows of cable hooks 3 are installed on the upper surface of the platform deck 1, where n≥3, and the cable hooks 3 in the 1st to n-1th columns have different installation spacings, while the cable hooks 3 in the nth column have the same installation spacing as the 1st column.

[0040] Furthermore, the cable hooks 3 in the 1st to n-1th columns are all welded and fixed to the upper surface of the platform deck 1; the cable hooks 3 in the nth column are fixedly connected to the vibration isolator by bolts, and the vibration isolator is fixedly connected to the platform deck 1.

[0041] Furthermore, the multiple vibration output gears specifically include a sinusoidal excitation output gear and multiple analog excitation output gears, and the multiple analog excitation output gears are respectively consistent with actual vibration excitation signals of multiple marine power supplies.

[0042] Furthermore, the support height of the excitation source support platform 5 is consistent with the actual installation height of the marine power supply.

[0043] Furthermore, the cable to be tested 8 is provided with a cable sheath on the outside and a cable core on the inside; the vibration excitation source 4 is connected to the cable core.

[0044] Furthermore, the platform deck 1 is specifically a rectangular structure, and the multiple support columns 2 are evenly arranged along each side of the lower surface of the platform deck 1.

[0045] Example 2, as Figure 2 As shown, based on the same inventive concept, this embodiment provides a method for testing the vibration noise transfer characteristics of a ship cable, based on the test bench as described in Example 1, specifically comprising the following steps:

[0046] S1, Test Condition 1: Keep the support height of the excitation source support platform unchanged, and set the vibration excitation source to the sinusoidal excitation output gear. Then, fix the cables to be tested in the cable hooks in columns 1 to n-1 in sequence. The signal processor collects the excitation source signal and the vibration sensor signals under this condition to generate the cable vibration modal parameters of Condition 1.

[0047] S2, Test Condition 2: Keep the cable under test fixed in the first row of cable hooks, and set the vibration excitation source to the sinusoidal excitation output position. Then, adjust the excitation source support to different heights in sequence. The signal processor collects the excitation source signal and the vibration sensor signals under this condition to generate the cable vibration modal parameters for Condition 2.

[0048] S3, Test Condition 3: Keep the support height of the excitation source support platform unchanged, and keep the cable to be tested fixed in the first row of cable hooks. Then, set the vibration excitation source to different analog excitation output gears in sequence, and use the signal processor to collect the excitation source signal and each vibration sensor signal under this working condition to generate the cable vibration modal parameters of working condition 3;

[0049] S4, test condition four: keep the support height of the excitation source support platform unchanged, keep the cable to be tested fixed in the first row of cable hooks, set the vibration excitation source to the sinusoidal excitation output gear, and then install vibration sensors at the same position on the cable sheath and cable core respectively. The signal processor collects the excitation source signal and each vibration sensor signal under this condition to generate the cable vibration modal parameters of condition four;

[0050] S5, Test Condition 5: Keep the support height of the excitation source support platform unchanged, and set the vibration excitation source to the sinusoidal excitation output gear. Then, fix the cables to be tested in the cable hooks of the 1st and nth columns respectively. The signal processor collects the excitation source signal and the vibration sensor signals under this condition to generate the cable vibration modal parameters of Condition 5.

[0051] S6, replacing different types of cables in turn, and repeating steps S1 to S4, to analyze the effects of different cable types on the vibration and noise transfer characteristics of the marine cable under various working conditions.

[0052] In a third embodiment, this embodiment further provides a test bench for the vibration and noise transfer characteristics of marine cables. The excitation source is connected to a test point on the test cable. Preferably, the excitation source is connected to one end of the test cable. Preferably, the excitation source is connected to the metal core of the cable. The excitation source outputs signals of varying frequencies and amplitudes, which are applied to the test cable. The excitation source simulates the vibration excitation experienced during the operation of an actual power source, such as a generator.

[0053] The excitation source support platform is used to hold the excitation source, and its height is adjustable;

[0054] The test cable is fixed to the test platform through cable hooks. Preferably, the cable hooks are arranged at equal intervals.

[0055] A plurality of cable clamps are arranged on the gantry slab, preferably, the first column of cable clamps is fixed to the gantry slab by welding, and the second column of cable clamps is fixed to the gantry slab by bolts and vibration isolators, and the vibration isolators are fixed to the gantry slab, preferably, the gantry slab is rectangular in shape;

[0056] The support columns are used to support the gantry slab, preferably, the number of support columns is 8, and the lengths of the support columns are equal;

[0057] A plurality of vibration sensors are arranged at the test points, preferably, the test points are equidistantly arranged on the test cable;

[0058] Preferably, the vibration sensors are acceleration sensors;

[0059] The excitation source, the sensors and the signal processor are connected, and the signal processor is used to analyze and process the vibration data collected by the sensors.

[0060] In the fourth embodiment, based on the same inventive concept, the application further provides a method for testing the vibration noise transmission characteristics of a marine cable, which is based on the test bench of the third embodiment, and specifically includes the following steps:

[0061] S1, the test cable is arranged on each column of cable clamps in sequence, the height of the excitation source support table is fixed, the excitation source applies a certain range of sinusoidal excitation to the test cable, and the signal processor obtains the modal parameters according to the excitation signal and the vibration signals collected by the sensors. Through the data, the influence of different cable clamp installation spacings on the vibration noise transmission characteristics of the marine cable is analyzed;

[0062] S2, the cable is arranged on a column of cable clamps, the excitation source support table is adjusted to different heights in sequence, the excitation source applies a certain range of sinusoidal excitation to the test cable, and the signal processor obtains the modal parameters according to the excitation signal and the vibration signals collected by the sensors. Through the data, the influence of different excitation source heights on the vibration noise transmission characteristics of the marine cable is analyzed;

[0063] S3, the cable is arranged on a column of cable clamps, the vibration excitation source outputs the vibration excitation signal of an actual power source such as a generator, and the signal processor obtains the modal parameters according to the excitation signal and the vibration signals collected by the sensors. Through the data, the influence of different marine power vibration excitation signals on the vibration noise transmission characteristics of the marine cable is analyzed;

[0064] S4, the vibration sensors are fixed at the positions outside the cable skin and the cable inner core at the same positions with the cable skin removed, respectively, the excitation source applies a certain range of sinusoidal excitation to the test cable, and the signal processor obtains the modal parameters according to the excitation signal and the vibration signals collected by the sensors. Through the data, the influence of the cable skin on the vibration noise transmission characteristics of the marine cable is analyzed;

[0065] S5, the cable hook installation mode is changed, the vibration isolator is added on the installation support, the steps S1-S4 are repeated, and the influence of the vibration noise transmission characteristic of the marine cable under each working condition is obtained by adding the vibration isolator;

[0066] S6, different cables are used, the steps S1-S4 are repeated, and the modal parameters of the different cables under the arrangement and excitation conditions are obtained.

[0067] Preferably, the modal parameters include: natural frequency, damping ratio, modal shape, modal stiffness, modal damping and the like.

[0068] In summary:

[0069] 1, the ship cable vibration noise transmission characteristic test bench and test method provided by the application, through setting the cable hook in multiple installation forms on the bench plate, combining the controllable excitation source, the adjustable support column, the vibration sensor, the signal processor and the like, the vibration noise transmission characteristic of multiple types of cables under different installation forms can be tested, and the real working environment of the marine cable can be simulated, the application range is wide, and the test result is accurate.

[0070] 2, the test bench and the cable hook can be flexibly adjusted according to different installation modes of the cable, and the vibration noise transmission characteristic of the cable under the actual installation state can be simulated;

[0071] 3, the sensor arrangement can be adjusted to test a single cable or even a bundle of cables, so that the influence of different cable forms on the vibration noise transmission characteristic of the cable can be obtained;

[0072] 4, the vibration excitation source is adjusted to simulate the actual ship power vibration excitation signal, and the influence of different ship power on the vibration noise transmission characteristic of the cable can be obtained;

[0073] 5, the ship cable vibration noise transmission characteristic test bench and test method provided by the application provides a test bench scheme and a test scheme for the vibration noise transmission characteristic of the marine cable, and provides technical support for further reducing the vibration noise transmission of the marine cable and forming the cable optimization arrangement scheme.

[0074] It is easy for those skilled in the art to understand that the above description is only a preferred embodiment of the application, and is not used to limit the application, and any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A method for testing the vibration and noise transfer characteristics of marine cables, based on a test bench for the vibration and noise transfer characteristics of marine cables, characterized by: The test bench comprises a bench deck (1), a plurality of support columns (2) are installed on the lower surface of the bench deck (1), a cable hook (3) for fixing a cable to be tested (8) is installed on the upper surface of the bench deck (1), one end of the cable to be tested (8) is connected to a vibration excitation source (4), the vibration excitation source (4) is provided with a plurality of vibration output gears, the vibration excitation source (4) is fixed on an excitation source support platform (5), a plurality of preset test points are provided on the cable to be tested (8), and each test point is provided with a vibration sensor (6); the support columns (2) and the excitation source support platform (5) are both structures that can be adjusted upward and downward, and the vibration excitation source (4) and the vibration sensor (6) are both electrically connected to a signal processor (7); The upper surface of the platform deck (1) is provided with n rows of cable hooks (3), wherein n≥3, and the cable hooks (3) in the first row to the n-1th row are installed at different intervals, while the cable hooks (3) in the nth row and the first row are installed at the same interval. The testing method comprises the following steps: S1, Test Condition 1: Keep the support height of the excitation source support platform unchanged, and set the vibration excitation source to the sinusoidal excitation output gear. Then, fix the cables to be tested in the cable hooks in columns 1 to n-1 in sequence. The signal processor collects the excitation source signal and the vibration sensor signals under this condition to generate the cable vibration modal parameters of Condition 1. S2, Test Condition 2: Keep the cable under test fixed in the first row of cable hooks, and set the vibration excitation source to the sinusoidal excitation output position. Then, adjust the excitation source support to different heights in sequence. The signal processor collects the excitation source signal and the vibration sensor signals under this condition to generate the cable vibration modal parameters for Condition 2. S3, Test Condition 3: Keep the support height of the excitation source support platform unchanged, and keep the cable to be tested fixed in the first row of cable hooks. Then, set the vibration excitation source to different analog excitation output gears in sequence, and use the signal processor to collect the excitation source signal and each vibration sensor signal under this working condition to generate the cable vibration modal parameters of working condition 3; S4, test condition four: keep the support height of the excitation source support platform unchanged, keep the cable to be tested fixed in the first row of cable hooks, set the vibration excitation source to the sinusoidal excitation output gear, and then install vibration sensors at the same position on the cable sheath and cable core respectively. The signal processor collects the excitation source signal and each vibration sensor signal under this condition to generate the cable vibration modal parameters of condition four; S5, Test Condition 5: Keep the support height of the excitation source support platform unchanged, and set the vibration excitation source to the sinusoidal excitation output gear. Then, fix the cables to be tested in the cable hooks of the 1st and nth columns respectively. The signal processor collects the excitation source signal and the vibration sensor signals under this condition to generate the cable vibration modal parameters of Condition 5. S6, replacing different types of cables in turn and repeating steps S1 to S5 to analyze the impact of different cable types on the vibration and noise transmission characteristics of the ship cable under various working conditions.

2. A method for testing vibration noise transfer characteristics of a ship cable according to claim 1, characterized in that: The cable hooks (3) in the first to n-1th columns are all welded and fixed to the upper surface of the platform deck (1); the cable hooks (3) in the nth column are fixedly connected to the vibration isolator via bolts, and the vibration isolator is fixedly connected to the platform deck (1).

3. A method for testing vibration noise transfer characteristics of a ship cable according to claim 1, characterized in that: The multiple vibration output gears specifically include a sinusoidal excitation output gear and multiple analog excitation output gears, and the multiple analog excitation output gears are respectively consistent with actual vibration excitation signals of multiple marine power supplies.

4. A method for testing vibration noise transfer characteristics of marine cables according to claim 1, characterized in that: The support height of the excitation source support platform (5) is consistent with the actual installation height of the marine power supply.

5. A method for testing vibration noise transfer characteristics of marine cables according to claim 1, characterized in that: The cable to be tested (8) is provided with a cable sheath on the outside and a cable core on the inside; the vibration excitation source (4) is connected to the cable core.

6. A method for testing vibration noise transfer characteristics of marine cables according to claim 1, characterized in that: The platform deck (1) is specifically a rectangular structure, and the plurality of support columns (2) are evenly arranged along each side of the lower surface of the platform deck (1).

7. A method for testing vibration-noise transfer characteristics of marine cables according to claim 1, characterized in that: The working condition one cable vibration modal parameters are used to analyze the influence of different cable hook installation spacing on the vibration and noise transfer characteristics of marine cables; The cable vibration modal parameters of working condition 2 are used to analyze the influence of different excitation source heights on the vibration and noise transfer characteristics of marine cables; The three cable vibration modal parameters of the working condition are used to analyze the influence of different marine power supply vibration excitation signals on the vibration noise transfer characteristics of marine cables; The cable vibration modal parameters of the working condition 4 are used to analyze the influence of the cable skin on the vibration and noise transfer characteristics of the marine cable; The cable vibration modal parameters of working condition 5 are used to analyze the impact of adding vibration isolators on the vibration and noise transfer characteristics of marine cables.

8. A method for testing vibration-noise transfer characteristics of marine cables according to claim 7, characterized in that: The cable vibration modal parameters include: the natural frequency, damping ratio, modal vibration shape, modal stiffness and modal damping of the cable to be tested.

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