KR102347828B1 - Bending fatigue test system of power core for floating offshore wind power dynamic cable - Google Patents

Abstract

The present invention relates to a bending fatigue test system of a power core for a floating offshore wind power dynamic cable, which is for freely changing and testing the bending feature, four-point bending, and three-point bending for the power core, comprising: a system body; guide rails installed parallel to each other on the system body; a motion block in which a plurality of parts are coupled to the guide rails to be movable in a straight line; a driving means driven through the control of a control means configured to control the power of a power supply unit to linearly reciprocate the motion block; a fixing means provided in the system body and fixed at two points so that a plurality of test target power cores are disposed while crossing the motion block in a parallel direction with an interval; and a load applying means provided in the motion block and adapted to apply a load by contacting both sides of each of the power cores under test to apply a load. The load applying means includes: a point contact member provided in the motion block and configured to point-contact both sides of the power core under test; and a line contact member provided in the motion block and configured to make line contact with both sides of the power core to be tested. Thus, the bending fatigue test system of the present invention secure cable quality and improve durability in a subsequent engineering process.

Description

Bending fatigue test system of power core for floating offshore wind power dynamic cable

The present invention relates mainly to a bending fatigue testing system designed to test bending fatigue for a power core for floating offshore wind power dynamic cables.

Specifically, it is possible to secure the reliability of the bending fatigue test value by forming the behavior of the dynamic cable similarly with respect to various environmental factors such as marine conditions (waves, wind, current) etc. that are actually installed. It relates to a bending fatigue test system for a power core for floating offshore wind power dynamic cables, which can secure cable quality and improve durability in the subsequent engineering process by extracting a more accurate fatigue life value for the power core.

More specifically, it is possible to freely change the bending feature, four-point bending, and three-point bending for the power core, as well as perform a test on a number of power core samples at the same time to maximize the test efficiency. It relates to the bending fatigue test system of power core for offshore wind power dynamic cable.

In general, the inside of a power core for a dynamic cable is composed of a 'Helix structure', and a careful selection is required because it can affect the loosening and recovery depending on the load application method.

Accordingly, a fatigue life curve (S-N Curve) is created by detecting bending fatigue to which load application methods according to point contact (three-point contact, four-point contact) and line contact are applied to the power core.

That is, it is to check the effect on the power core with respect to load application methods such as point contact (three-point contact, four-point contact) and line contact; At this time, in order to create a fatigue life curve (S-N Curve), at least three specimens (power core cable) are required to be tested.

On the other hand, various devices have been proposed to test the bending performance of the sample.

As one of them, there is Korean Patent Application No. 10-2014-0067934 (Name: Gelbo Flexural Tester/2014.06.03.), and as known in the publication, a rotating part that rotates based on a drive shaft; a connecting part having a first hinge shaft formed at an edge in a width direction of the rotating part in a direction parallel to the driving shaft and one end of which is shaft-coupled; a joint part whose one end is axially coupled to the other end of the connection part and a second connection shaft formed in a direction parallel to the first hinge shaft, thereby reciprocating in the longitudinal direction by rotation of the connection part; And a spiral guide groove is formed in the outer periphery of the longitudinal direction, one end is axially coupled to the other end of the joint portion in the longitudinal direction of the joint portion, and the other end is coupled to a fixed test object to apply a tensile load and a compressive load to the test object. a pressing unit to be applied; and a support part that guides the movement path of the pressing part and is fitted in the guide groove on the inner periphery to form a guide protrusion for rotating the pressing part to apply a torsional load to the test object.

And in Korean Patent Application No. 10-2017-7034854 No. 10-2017-7034854 (Name: Pipe test system and method/2016.05.03.), as known in the publication, as a pipe test system including at least the following test modules, pipe reeling Reeling and straightening simulation module—The pipe reeling and straightening simulation module comprises: two pipe end holders for holding first and second ends of a pipe section under test, respectively; reeling former; straightening molding machine; The pipe section under test and the reeling to move the pipe under test section into and out of contact with any one of the reeling machine and the straightening machine and to apply a contact force to either the reeling machine or the straightening machine A pipe testing system is disclosed that includes a translator for performing a relative translational motion of a forming machine and of the pipe and the straightening machine.

On the other hand, in Korean Patent Application No. 10-1996-0029827 (Name: Bending Stiffness Testing Apparatus for Steel Plate/1996.07.23.), as is known in the publication, in order to increase the bending load applied to the test object, it is multi-staged. A frame having a plurality of vertical and vertical holes through which fixing pins are inserted to fix the stacked weights, a plate connected to a hook caught at the tip of the test object via a cable, and the lower surface of the plate A bending stiffness testing apparatus comprising a cylinder equipped with a ram supporting the flexure is disclosed.

In addition, in Korean Patent Application No. 10-2020-0181702 (Name: Floating Offshore Wind Power Dynamic Cable Bending Stiffness Test Equipment/2020.12.23.), as known in the publication, a first support on which a bending cylinder is installed; a bracket connected to the end of the cylinder rod of the bending cylinder using a connection module; On the lower side of the bracket, the second frame is formed along the longitudinal direction of the cable, the first frame extends in the opposite direction of the first support, and the second frame extends in the vertical direction with respect to the first frame in the vertical direction. a cable guide configured at an end of the first frame; Tensile force generating units located at both ends of the cable guide; A tensile force generating device configured inside the tensile force generating unit to generate tensile force at both ends of the cable; and a bending stiffness testing facility including a.

Korean Patent Application No. 10-2014-0067934 (2014.06.03.) Korean Patent Application No. 10-2017-7034854 (2016.05.03.) Korean Patent Application No. 10-1996-0029827 (June 23, 1996) Korean Patent Application No. 10-2020-0181702 (2020.12.23.)

However, when testing the bending fatigue of the power core for floating offshore wind power dynamic cables, the conventional test facilities for samples as described above simulate various environmental factors such as marine conditions (waves, wind, currents). There was a problem in that it was difficult to properly apply the tests according to 'bending feature', 'four-point bending', and 'three-point bending'.

In addition, there is a problem in that the test efficiency is lowered as the test cannot be performed on a plurality of power core samples at the same time, and the test is performed by sequentially applying the samples of a single individual one by one.

The present invention has been proposed to solve the problems of the prior art, and the object of the present invention is to test the bending fatigue of a power core for a floating offshore wind power dynamic cable, and the actual installed offshore conditions ( As the behavior of the dynamic cable is similarly formed for various environmental factors such as waves, wind, currents, etc., the reliability of the bending fatigue test value can be secured, resulting in more accurate fatigue of the manufactured power core. The purpose is to provide a bending fatigue test system for power cores for floating offshore wind power dynamic cables that can be used to secure cable quality and improve durability in the subsequent engineering process by extracting the lifetime value.

Another object of the present invention is to allow testing by freely changing the bending feature, four-point bending, and three-point bending of the power core, as well as to perform a test on a number of power core samples at the same time to maximize test efficiency It is to provide a bending fatigue test system for power cores for floating offshore wind power dynamic cables.

Bending fatigue test system of the power core for floating offshore wind power dynamic cable according to the present invention for achieving the object of the present invention as described above, the system body; Guide rails installed parallel to each other on the system body; an exercise block in which a plurality of parts are coupled to the guide rails to be movable in a straight line; a driving means driven through the control of a control means configured to control the power of the power supply unit to linearly reciprocate the motion block; a fixing means provided in the system body and fixed at two points so that a plurality of test target power cores are disposed while crossing the motion block in a parallel direction with an interval; In the bending fatigue test system of the power core for floating offshore wind power dynamic cable comprising; The load applying means includes a point contact member provided in the exercise block to make point contact with both sides of the power core under test, and a line provided in the motion block to make line contact with both sides of the power core under test. including a contact member; The line contact member is provided with a line contact surface made of an 'arc' shape in which the central portion is convexly curved compared to both ends; The point contact member is provided in the exercise block and includes a four-point bending test bench that is provided to make point contact with both sides of the power core under test at two points, and is provided in the motion block and includes both sides of the power core under test in the center It is characterized in that it is provided with a three-point bending test stand designed to make point contact at one point.

The bending fatigue test system of the power core for a floating offshore wind power dynamic cable according to the present invention made as described above is a marine condition (wave, wave, It has the effect of securing the reliability of the obtained test data by obtaining the bending fatigue test value while similarly forming the behavior of the dynamic cable by wind and current).

Through this, it is possible to extract a more accurate fatigue life value for the manufactured power core, thereby securing cable quality and improving durability in the subsequent engineering process.

In particular, it is possible to freely change and test the bending feature, four-point bending, and three-point bending of the power core through the contacts constituting the load applying means, as well as to perform the test on a number of power core samples at the same time. It has the effect of maximizing efficiency.

1 is a schematic illustration showing a bending fatigue test system of a power core for a floating offshore wind power dynamic cable according to an embodiment according to the present invention.
Figure 2 is a schematic illustration showing a bending fatigue test system of the power core for floating offshore wind power dynamic cable according to the present embodiment.
Figure 3 is a schematic illustration showing the operating state of the bending fatigue test system of the power core for floating offshore wind power dynamic cable according to the present embodiment.
Figure 4 is a schematic illustration showing a load applying means constituting the bending fatigue test system of the power core for floating offshore wind power dynamic cable according to the present embodiment.
5 and 6 are schematic exemplary views showing the working state of the load applying means constituting the bending fatigue test system of the power core for floating offshore wind power dynamic cable according to the present embodiment.
7 is a schematic illustration showing the control state of the bending fatigue test system of the power core for floating offshore wind power dynamic cable according to the present embodiment.

Hereinafter, with reference to the accompanying drawings, a bending fatigue test system of a power core for a floating offshore wind power dynamic cable according to a preferred embodiment according to the present invention will be described in detail as follows.

Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. This embodiment is provided to more completely explain the present invention to those of ordinary skill in the art. Accordingly, the shape of elements in the drawings may be exaggerated to emphasize a clearer description. It should be noted that in each drawing, the same member is shown with the same reference numerals in some cases. Detailed descriptions of well-known functions and configurations determined to unnecessarily obscure the gist of the present invention will be omitted.

1 to 7 are views showing a bending fatigue test system 1 of a power core for floating offshore wind dynamic cables according to an embodiment of the present invention, for floating offshore wind dynamic cables according to this embodiment The bending fatigue test system (1) of the power core includes a system body (2) installed on the floor; Guide rails 21 installed parallel to each other on the system body 2; and a motion block 3 in which a plurality of portions are coupled to the guide rail 3 to be movable in a straight line reciprocating motion.

That is, on the guide rails 21 provided in the system body 2, the movement block 3 is coupled to enable forward and backward movement (linear reciprocating movement).

In the above guide rails 21, "H-beam" that can be made of a steel frame structure; As for the configuration and structure, it is preferable that the configuration and structure selected by the user from among conventionally known techniques are suitably applied.

In the above, the exercise block 3 is formed in a 'c' shape having a running plate 31 coupled to the guide rail 21 on both sides and a connecting rod 32 connecting the running plates 31 to each other. as possible; As for the configuration and structure, it is preferable that the configuration and structure selected by the user from among conventionally known techniques are suitably applied.

The bending fatigue test system 1 of the power core for floating offshore wind power dynamic cable according to this embodiment is driven through the control of the control means 71 to control the power of the power supply unit 72, and the motion block (3) a drive means (4) adapted to make a linear reciprocating motion; includes.

That is, the driving means 4 is driven based on the program data set in the control means 71 through the user's selective operation by a separately provided operation device (not shown) to operate the exercise block 3 . to move in a straight line.

At this time, the movement block (3) is linearly moved through the load value driven by the driving means (4); The load value applied through the driving means 4 is formed according to set data, and can be adjusted through the applied load value to the power core.

In the above, the driving means 4 may include an 'actuator' 41 structure configured to receive power through the control of the control means 71 to implement a linear motion; As for the configuration and structure, it is preferable that the configuration and structure selected by the user from among conventionally known techniques are suitably applied.

In the above, the driving means (4) is installed in the system body (2) and includes a driving frame (42) made of a 'frame structure', and is rotatably fixed to the driving frame (42), and in the above, the movement block (3) ) may include the actuator 41 coupled to the connecting rod 32 in the driving end 43 to be axially rotatable.

That is, the actuator 41 is driven through the selective control of the control means 71 to cause the driving end 43 to make a linear motion, which causes the motion block 3 to linearly move in the same direction. The movement block 3 moves linearly on the guide rail 21 .

The bending fatigue test system 1 of the power core for floating offshore wind power dynamic cable according to the present embodiment made as described above is provided in the system body 2 and a plurality of test target power cores 100 are spaced while It includes a; fixing means (5) to be fixed at two points, respectively, so as to be arranged while crossing the movement block (3) in a parallel direction.

That is, the two points (both ends) of the power cores 100 to be tested to be tested are strongly bound to the fixing means 5 to be fixed.

At this time, it is preferable that each of the power cores under test 100 is fixed while having an interval therebetween.

In the above, the fixing means 5 is provided to be supported on the outer side of the guide rails 21 in the system main body 2 , respectively, and the fixing frames 51 are spaced apart from each other. It may include fixing sockets 52 which are respectively provided at positions coincident with each other with respect to the other fixing frames 51 facing each other and fixed while passing through both side ends of the power cores 100 to be tested.

That is, the two and one set of the fixing sockets 52 respectively disposed at positions facing each other are fixedly disposed while both end portions of the power cores under test are penetrated and bound.

At this time, the test subject power core 100 is disposed while crossing the exercise block (3).

The configuration and structure of the fixing sockets 52 in the above, the configuration and structure, it is preferable that the configuration and structure selected by the user from among the conventionally known techniques is suitably applied.

On the other hand, the fixed frame 51 is electrically connected to the control means 71, and the end of the power core under test 100 that is fixed while extending outwardly from the fixing socket 52 is captured and fixed while a tensile load is applied. An axial tension measuring device 200 configured to measure axial tensile force while applying may be provided.

That is, the axial tensile force of the power core 100 under test can be simultaneously measured through the axial tension measuring device 200 , thereby further improving usability.

As can be made of the configuration and structure of the axial tensioner 200 in the above, it is preferable that the configuration and structure are suitably applied to the configuration and structure selected by the user from among the conventionally known techniques.

The bending fatigue test system 1 of the power core for floating offshore wind power dynamic cable according to this embodiment made as described above is provided in the motion block 3 and each of the power cores 100 to be tested It includes a; load application means (6) configured to apply a load by contacting from both sides.

That is, the load applying means (6) for each of the power cores under test fixed to the fixing means (5) while the movement block (3) is linearly moved through the driving means (4). This pressure is applied to each load.

Accordingly, bending fatigue data for each of the power cores under test 100 is obtained.

In the above, the load applying means (6) is provided in the movement block (3) and is provided in the movement block (3) and is provided with a point contact member provided to make point contact with both sides of the power core under test (100). and a line contact member 61 configured to make line contact with both sides of the power core 100 to be tested.

That is, the actuator 41 is driven to cause the movement block 3 to move linearly on the guide rail 21, and at this time, both ends of each of the power cores under test 100 are attached to the fixing means 5. As each is fixed by the flexural force, a bending load is generated while the portion supported by the point contact member and the line contact member 61 is pressed in the moving direction of the motion block 3 .

When bending fatigue with respect to the bending load applied to the power cores under test 100 is detected, bending fatigue data for each of the power cores under test 100 is obtained.

In the bending fatigue test system 1 of the power core for floating offshore wind power dynamic cable according to the present embodiment made as described above, the line contact member 61 has an 'arc whose central portion is convexly curved compared to both ends. )' is provided with a line contact surface 611 made of a shape.

That is, the 'bending feature' test is performed when a bending load is applied while the power cores 100 to be tested are in surface contact through the line contact surface 611 .

At this time, as the line contact surface 611 is formed in an 'arc' shape, local breakage (damage) of the power cores 100 to be tested does not occur when a load is applied, improving the stability of the test operation. will be implemented

In the above, the line contact member 61 includes a line contact frame 612 provided in the motion block 3 to linearly move in the same direction, and a surface facing each other provided in the line contact frame 612 . It may include a pair of line contact bodies 613 on which the line contact surface 611 is formed.

That is, when the line contact frame 612 moves in the same direction during the linear motion of the motion block 3, the power core 100 to be tested is supported when the line contact body 613 is in line contact with each other. Bending fatigue is formed for , and desired bending fatigue data can be obtained.

In the bending fatigue test system (1) of the power core for floating offshore wind power dynamic cable according to the present embodiment made as described above, the point contact member is provided in the motion block (3) and the power core under test (100) ), a four-point bending test bench 62 provided to point-contact both sides at two points, and the motion block 3 to bring both sides of the power core 100 under test into point-contact at one point in the center. A three-point bending test stand 63 is provided.

That is, when each of the four-point bending test stand 62 and the three-point bending test stand 63 moves in the same direction during the linear motion of the motion block 3, each of the test subject power cores 100 is Each of the four-point bending test bench 62 and the three-point bending test stand 63 are respectively subjected to a bending load while in point contact to obtain respective bending fatigue data.

In the above, the four-point bending test stand 62 and the three-point bending test stand 63 are a pair of point contact bodies having a circular outer peripheral surface to be in point contact with both sides of each of the power cores under test (100). 64) may be included.

That is, when the bending load is applied by the point contact bodies 64, the door is not locally broken (damaged) in point contact in the form of an 'arc' with respect to the power cores 100 to be tested. Therefore, the stability of the test operation is realized.

In the above, each of the point contact bodies 64 constituting the four-point bending test stand 62 is provided in each of the running platforms 31 constituting the motion block 3, and the test subject power core ( 100) can be brought into contact at two points, including both ends (two points) of the power core 100 to be tested fixed by the fixing means 5 as a whole, while in point contact with respect to four points while bending fatigue data can be obtained.

In the above, each of the point contact bodies 64 constituting the three-point bending test stand 63 is a point test frame 33 provided while connecting each of the running stands 31 constituting the motion block 3 . ), which can come into contact with the power core under test at one point with respect to the power core under test 100, and includes both ends (two points) of the power core under test fixed by the fixing means 5 . Thus, bending fatigue data can be obtained while making point contact for three points as a whole.

The point contact body 64 in the above, to be able to be installed idling, the configuration and structure, it is preferable that the configuration and structure selected by the user from among the conventionally known techniques are suitably applied.

When the bending fatigue test process is described in detail through the bending fatigue test system 1 of the power core for floating offshore wind power dynamic cable according to the present embodiment made as described above in detail.

The bending fatigue test system 1 of the power core for floating offshore wind power dynamic cable according to this embodiment simultaneously performs bending features, four-point bending, three-point bending, and axial tensile force for three power cores 100 to be tested. tests can be performed for

First, each of the power cores under test 100 to be tested on each of the line contact members 61 and a pair of point contact members are supported while penetrating, so that both ends are fixed to the fixing means 5 . do.

At this time, one end of the at least one test target power core 100 is bound and fixed to the axial tension measurement device 200 provided in the fixing means 5 .

In this way, when each of the power cores under test 100 is fixed to the fixing means 5, a separate operation device is operated according to the user's selection to operate the driving means 4 through the control means 71. By driving, the movement block 3 is linearly moved on the guide rail 21 .

At this time, while the load applying means 6 moves in the same direction, data for bending feature fatigue, four-point bending fatigue, and three-point bending fatigue for each of the power cores under test 100 are detected. .

In addition, data is obtained by measuring the axial tension through the axial tension measuring device 200 .

As described above, when the test data for each of the power cores under test is obtained, the driving means is operated through the manipulation of the manipulation means according to the user's selection or the control operation according to the data set in the control means 71 . When (4) is stopped, the motion block 3 returns to its original position, and when each of the power cores 100 to be tested is separated from the fixing means 5, the bending fatigue test is completed.

As described above, the bending fatigue test system 1 of the power core for a floating offshore wind power dynamic cable according to this embodiment is a bending feature for the power core through the contacts constituting the load applying means 6, 4 points It is characterized by the technical configuration that it is possible to test by freely changing bending and three-point bending, as well as to perform testing on a number of power core samples at the same time.

One embodiment of the present invention described above is merely exemplary, and those of ordinary skill in the art to which the present invention pertains will appreciate that various modifications and equivalent other embodiments are possible therefrom. . Therefore, it will be well understood that the present invention is not limited to the form mentioned in the above detailed description. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims. Moreover, it is to be understood that the present invention covers all modifications, equivalents and substitutions falling within the spirit and scope of the invention as defined by the appended claims.

1: Bending fatigue system of power core for floating offshore wind power dynamic cable
100: test target power core 200: axial tension measuring device
2: system body 21: guide rail
3: exercise block 31: running platform
32: connecting rod 33: point test frame
4: drive means 41: actuator
42: drive frame 43: drive end
5: fixing means 51: fixing frame
52: fixed socket 6: load applying means
61: line contact member 611: line contact surface
612: line contact frame 613: line contact body
62: 4-point bending test bench 63: 3-point bending test bench
64: point contact body 71: control means
72: power supply

Claims (1)

a system body; guide rails installed parallel to each other on the system body; an exercise block in which a plurality of parts are coupled to the guide rails to be movable in a straight line; a driving means driven through the control of the control means configured to control the power of the power supply unit to linearly reciprocate the motion block; fixing means provided in the system body and fixed at two points so that a plurality of power cores to be tested are disposed while crossing the motion block in a parallel direction with an interval; In the bending fatigue test system of the power core for floating offshore wind power dynamic cable comprising;
The load application means,
a point contact member provided in the exercise block and configured to make point contact with both sides of the power core under test, and a line contact member provided in the motion block and configured to make line contact with both sides of the power core under test;
The line contact member,
A line contact surface formed in an 'arc' shape in which the central portion is convexly curved compared to both ends is provided;
The point contact member,
A four-point bending test bench provided in the exercise block to point-contact both sides of the power core under test at two points, and a four-point bending test bench provided in the exercise block to point-contact both sides of the power core under test at one central point Bending fatigue test system of power core for floating offshore wind power dynamic cable, characterized in that it comprises a three-point bending test stand.

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