KR101823031B1 - Apparatus for analysing semi-submersible offshore structure and method for analysing structure to combined design load parameter using the same - Google Patents

Abstract

The present invention relates to an apparatus to analyze a semi-submersible offshore structure, capable of analyzing a structure based on a force applied to the structure as determined by using a design wave value found in a torsion split environment and a longitudinal shear split environment of a structure combined with split generated by the inflow of wave heights; and a structure analysis method for a combined load using the same. According to one embodiment of the present invention, the method of a structure analysis apparatus comprises: a step of extracting torsion, longitudinal shear, and split having the biggest response value among response parameters with respect to a structure based on an analysis result analyzing movement of the structure; a step of selecting an angle of the torsion, the longitudinal shear, and the split having the biggest response value extracted in an extraction step; a step of estimating the second biggest response value between an included angle between the torsion and the split, and an included angle between the longitudinal shear and the split based on the angle selected in a selection step; a step of using and a preset response amplitude operator (RAO) and a design wave value found through the estimated angle having the second biggest response value to calculate the wave height; and a step of using the calculated wave height and the second biggest response value to determine the force applied to the structure due to the load of the torsion split and the longitudinal shear split reflected on the structure.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a semi-submergible structural analysis apparatus and a structure analysis method for combined loads using the semi-submodal structure analysis apparatus.

The present invention relates to a semi-submergible structure analysis apparatus and a method of analyzing a structure for combined loads using the same. More particularly, the present invention relates to a torsion split environment of a split coupled structure generated by the inflow of wave heights, The present invention relates to a semi-submergible structure analysis apparatus capable of analyzing a structure by a force received by a structure determined using a design wave, and a method of analyzing a structure for a combined load using the same.

In addition to the structural analysis results for Torsion and Longi Shear, a single DLP (Design Load Parameter) caused by the inflow of diagonal waves into a semi - submergible offshore structure of the. And shipowners are demanding structural analysis results on the characteristics of a structure coupled with a split (DLP: Combined DLP), that is, the combination of torsion and split, and the combination of the roof shear and split.

The combination of torsion and splitting, and the coupling between the roof shears and the splitting, should be selected manually. The reason for this is that in the environment of the torsion and split structure, the dimensions of torsion and split are different, and RAO for each linearly formed DLP is composed of harmonic functions. The other value is extracted.

Thus, conventionally, the combination of torsion and splitting, and the coupling between the long shear and the split, must manually select the design wave, and the combined load with the response to the largest single DLP, ie, the different values for the longs split and split torsions Is extracted, an excessive, inaccurate and unreasonable design wave can not be selected, so that the force applied to the structure can not be accurately determined.

Korean Patent Laid-Open Publication No. 2015-0114180 (Dec. 12, 2015) "Reliability Analysis Method of Offshore Wind Turbine Structures, Recording Medium Recorded Thereon, and Electronic Apparatus Including the Same"

An object of the present invention is to provide a semi-submergible structure analysis apparatus capable of determining a force received by a structure in a torsion split environment and a longs share split environment received by a structure generated by the inflow of wave heights, .

According to an embodiment of the present invention, a structure analyzing apparatus for analyzing a motion of a semi-submerged structure affected by a sea is used to perform a Torsion Split and a Longi.Shear ) A method for analyzing a structure in an environment in which a split occurs, the structure analyzing apparatus comprising: a torsion / tensile tester having a largest response value among the response parameters received by the structure, based on an analysis result obtained by analyzing a motion of the structure; Extracting a share and a split, respectively; Wherein the structure analyzing apparatus includes: selecting angles of a torsion, a roof shear, and a split having the largest response values extracted by the extracting step; Estimating the second largest response value among the angle between the torsion and the split and the angle between the longevity and the split based on the selected angle through the selecting step; Calculating the wave height using a design wave value obtained through an angle having the second largest response value and a preset response amplitude operator (RAO); And the structure analyzing apparatus includes a step of determining a force received by the structure due to a load of the torsion split and the roof shear split reflected on the structure using the calculated wave height and the second largest response value, A structure analysis method is provided.

The estimated second largest response value is the second largest response value between the ocean wave incident angle for the longest shearing with the largest response and the ocean incident angle for the split having the largest response in the longitude shear and split environments, The second largest response value between the ocean wave incident angle for the torsion having the largest response and the ocean incident angle for the split having the greatest response in the split environment and the design wave value is the second largest response value among the estimated second largest response values It may be worth pointing out.

In addition, the method for analyzing a structure according to an embodiment of the present invention may further include, after the calculating, displaying the size of the structure analyzer divided by the RAO in a graph form can do.

Further, in the structure analysis method according to an embodiment of the present invention, after the displaying step, the structure analyzing apparatus calculates a response value based on the response value of the split among the second largest response values And a step of obtaining a minimum point.

The determining step may be such that the structure analyzing apparatus multiplies the magnitude of the minimum point by the second largest response value to determine a force for the combined load of the structure and a force for the torsion split of the structure .

According to another embodiment of the present invention, the structure analysis in an environment where a torsion split and a longi shear split occur through the movement of a semi-submerged structure affected by the sea (Torsion, Longi.Shear, and Split) having the largest response value among the response parameters received by the structure based on the analysis result of analyzing the motion of the structure, An extraction unit; A selector for selecting an angle of a torsion, a longevity shear, and a split having the largest response value extracted; An estimator for estimating a second largest response value among the angle between the torsion and the split and the angle between the longitude share and the split, based on the selected angle; A calculation unit for calculating a wave height using a design wave value obtained through an angle having the second largest response value and a preset response amplitude operator (RAO); And a determining unit determining a force received by the structure due to a load of the torsion split and the roof shear split reflected on the structure using the calculated wave height and the second largest response value. do.

The determining unit may multiply the magnitude of the minimum point determined based on the response value of the split on the basis of the estimated second largest response value and the second largest response value to determine a force on the roonish shear split which is a combined load of the structure, You can determine the force for the split.

According to the embodiment of the present invention, there is an effect that a single force received by a structure can be determined in a torsion split environment and a longs share split environment received by a structure caused by the inflow of wave heights.

According to the embodiment of the present invention, the minimum point is obtained using the RAO based on the split, and the combined force received by the structure is determined by multiplying the magnitude of the minimum point, i.e., the wave height of the design wave and the large response value twice The force applied to the structure can be quickly and accurately grasped.

1 is a block diagram for explaining a structure analyzing apparatus according to an embodiment of the present invention;
FIG. 2 is a block diagram for explaining the control unit shown in FIG. 1;
3 is an operational flowchart for explaining a structure analysis method using a structure analyzing apparatus according to an embodiment of the present invention.
FIGS. 4 to 8 are graphs for explaining a process of obtaining a design wave for a torsion split and a longs share split, and FIG.
9 is a graph showing the RAO for a preset split reference;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram for explaining a structure analyzing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram for explaining a control unit shown in FIG.

1, an apparatus for analyzing a structure according to an embodiment of the present invention includes an input unit 11 for inputting information related to the present invention, a display unit 13 for displaying information related to the present invention, A storage unit 14 in which information such as RAO (Response Amplitude Operator) is stored and a motion of a semi-submergible structure affected by the sea are analyzed through the input unit 11, And a control section (12) for determining the force received by the structure in the environment of the structure in which the split and the roof shear split are combined.

The input unit 11 is a means for inputting the behavior-related information of the structure, that is, the semi-submergible structure.

The interface unit 12 transmits and receives information related to the present invention. In particular, the interface 12 may be installed in a semi-submerged structure to receive measured measurements from sensors for measuring the behavior of the structure.

Based on the analysis results of analyzing the motion of the semi-submergible structure affected by the sea, the control unit 12 calculates the design value of the torsion and split structure, And the structure analysis is performed by determining the force of the structure receiving the obtained design wave value by the torsion split and the longevity share split using the preset RAO.

The control unit 12 includes an extracting unit 121, a selecting unit 122, an estimating unit 123, a calculating unit 124, and a determining unit 125.

The extraction unit 121 extracts the torsion, the longevity shear, and the split having the largest response value among the response parameters received by the structure based on the analysis result of analyzing the motion of the structure affected by the sea.

The selection unit 122 selects the angles of the torsion, the longish shear, and the split having the largest extracted response value, respectively.

The estimating unit 123 estimates the second largest response value among the angles between the torsion and the split among the angles between the predetermined angles, and estimates the second largest response value between the longitude share and the split angle.

More specifically, the estimating unit 123 estimates the second largest response value between the ocean incidence angle for the longest shearing and the ocean incidence for the split having the largest response in the case of the longevity shear and split environments, Estimate the second largest response value between the ocean wave incident angle for the torsion with the largest response and the ocean incident angle for the split with the largest response in torsion and split environments.

A value indicating the minimum point at the angle having the second largest response value thus estimated is the design value.

The calculation unit 124 uses the design wave value calculated through the second largest response value estimated for the angle between the torsion and the split and the angle between the longitude and the split estimated by the estimation unit 123 and the preset RAO Calculate the dig.

The determining unit 125 determines the force received by the structure in the split-coupled torsion environment or the longshear environment using the calculated wave height and the second largest response value.

More specifically, the determination unit 125 displays the size of the estimated second largest response value divided by the RAO in a graph form, and a value indicating the minimum point among the second largest response values among the sizes of angles indicated by the graphs, (Magnitude) of the torsion or roof shear environment combined with the second largest response value to determine the force received by the structure.

A structure analysis method using a structure analyzing apparatus having such a structure will be described with reference to FIG.

3 is a flowchart illustrating a method for analyzing a structure using a structure analyzing apparatus according to an embodiment of the present invention.

Referring to FIG. 3, a structure analyzing apparatus 10 according to an embodiment of the present invention analyzes a motion of a semi-submerged structure affected by the sea, and analyzes the torsion, Respectively (S11). The torsion is a value (Moment) indicating the degree of twist of the twinax pontoons, the ronge shear is a force (force) indicating the force that the twinax pontoons are spreading to each other, and the longevity is a force .

Next, the structure analyzing apparatus 10 selects angles of torsion, roof shear, and split having the largest response values extracted (S13).

Next, the structure analyzing apparatus 10 estimates the second largest response value among the angles between the angle of the selected torsion and the angle of the split, the second largest response value among the angles between the angle of the selected roof shear and the angle of the split (S15).

The second largest response value can be estimated through Equation (1) below.

는 스플릿과 결합된 구조물의 환경에 대한 두번째로 큰 응답치,

는 각 구조물의 환경에 영향을 주는 토션(또는 론지쉐어)와 스플릿 사이의 사이각에서 스플릿의 최대 RAO이고,

는 토션(또는 론지쉐어)에 대한 해양파 위상이고,

는 토션(또는 론지쉐어)과 결합된 구조물의 환경에 영향을 주는 토션 스플릿과 론지쉐어 스플릿에 대한 설계파이고, Hn은 토션(또는 론지쉐어)과 결합된 구조물의 환경과 관련된 해양파 입사각(Wave Heading)이며, Tn은 토션(또는 론지쉐어)과 결합된 구조물의 환경과 관련된 해양파 주기(Wave Period)이다.here,

Is the second largest response value for the environment of the split-coupled structure,

Is the maximum RAO of the split at the angle between the torsion (or roof shear) and the split affecting the environment of each structure,

Is the ocean wave phase for a torsion (or longshear)

Is the design wave for the torsion splits and the longshear splits that affect the environment of the structure coupled with the torsion (or longs shear), Hn is the design wave for the environment associated with the torsion (or roof shear) Heading), and Tn is the ocean wave period associated with the environment of the structure coupled with the torsion (or the roots) shear.

Next, the structure analyzing apparatus 10 calculates the wave height by multiplying the design wave value by a preset RAO, and the wave height is calculated (S17). At this time, the structure analyzing apparatus 10 displays the magnitude of the estimated two-fold large response value divided by the RAO in the form of a graph, and the minimum point is determined based on the split of the second largest response value among the angles of the displayed angles. Here, the preset RAO is as shown in FIG. 9, and FIG. 9 shows the RAO for 75 degrees and 105 degrees.

Finally, the structure analyzer 10 uses the computed wave height and the second largest response value estimated at step S15 described above to determine the force on the roof shear splice received by the structure, and the strength of the structure on the torsion splits S19).

More specifically, the structure analyzing apparatus 10 can perform the structure analysis by multiplying the minimum point size by the RAO to reflect the force on the roof shear split of the structure, and the force on the torsion split of the structure.

For example, in the case of a structure in which a lotus ware and a split are combined, as shown in the graphs of FIGS. 4 and 5, the incident angle is found at 45 degrees in a response value having a maximum point, It is assumed that the case is obtained in Fig.

According to the pre-set rules, the angle between the angle of the loose ware and the angle of the split is selected at 60 degrees and 75 degrees, and the double point of the split shows a large sensitivity. Therefore, The split wave value is multiplied by RAO to obtain the second largest response value.

RAO is a value that the structure already has through motion analysis. The selected design wave value is multiplied by the second largest response value so that it is reflected as a force on the longs share split of the structure to perform the analysis of the structure. Therefore, it is possible to accurately perform the analysis of the structure by the force of the structure calculated by reflecting the selected design value in the environment of the combined structure of the roof shear split.

As shown in the graph of FIG. 6, it is assumed that the incident angle is obtained at 60 degrees and the split is obtained at 90 degrees in response to a response value having a maximum point in the case of a structure in which a torsion and a split are combined.

Similarly, when interpreting at 15-degree intervals, 75 degrees is selected between the angle of the torsion and the angle of the split, and the value indicating the minimum point at 75 degrees based on the split is the design value of the torsion split, A large response value is obtained. The selected design value and the second largest response value are multiplied to reflect the torsional force of the structure to the force of the rit to perform the analysis of the structure. Therefore, it is possible to accurately perform the analysis of the structure by the force received by the structure calculated by reflecting the selected design value in the environment of the torsion split.

FIG. 7 is a graph drawn assuming that the maximum response value at 135 degrees and the split at 90 degrees are shown in FIG. 7, and the value indicating the minimum point at 105 degrees is the design value of the roof shear split (indicated by circles).

Figure 8 shows that the torsion is at 102 degrees, so the second largest response value that can be selected is only 105 degrees. The value that indicates the minimum point at 105 degrees is the designed wave value of the torsion splits (the point indicated by circles).

The reason why the design wave value is selected on the basis of the split is that when the RAO value is changed, the RAO value for the split changes significantly as the angle changes. Therefore, when the response value is obtained, The accuracy of the response value to the environment and the runware environment can be improved.

The invention being thus described, it will be obvious that the same way may be varied in many ways. Such modifications are intended to be within the spirit and scope of the invention as defined by the appended claims.

10: Structure analyzing apparatus 11: Input unit
12: control unit 13: display unit
14: storage unit 15: interface unit

Claims (7)

As a structural analysis method in a torsion split and Longi.Shear split using a structure analyzer that analyzes the motion of a semi-submerged structure affected by the sea, ,
Extracting a torsion, a longevity shear and a split having the largest response value among the response parameters received by the structure based on the analysis result of analyzing the motion of the structure;
Wherein the structure analyzing apparatus includes: selecting angles of a torsion, a roof shear, and a split having the largest response values extracted by the extracting step;
Estimating the second largest response value among the angle between the torsion and the split and the angle between the longevity and the split based on the selected angle through the selecting step;
Calculating the wave height using a design wave value obtained through an angle having the second largest response value and a preset response amplitude operator (RAO); And
Wherein the structure analyzing apparatus includes a step of determining a force received by the structure due to a load of the torsion split and the roof shear split reflected on the structure using the calculated wave height and the second largest response value Structural analysis method. The method according to claim 1,
The estimated second largest response value is the second largest response value between the ocean wave incident angle for the longest shearing with the largest response and the ocean incident angle for the split having the largest response in the longitude shear and split environments, In the split environment, the second largest response value is between the ocean wave incident angle for the torsion having the greatest response and the ocean incident angle for the split having the greatest response,
Wherein the design wave value is a value indicating a minimum point of the estimated second largest response value. The method according to claim 1,
After the calculating step,
Wherein the structure analyzing apparatus further comprises a step of displaying a size of the estimated second largest response value divided by the RAO in a graphical form. The method of claim 3,
After the displaying step,
Wherein the structure analyzing apparatus further comprises a step of finding a minimum point based on a response value of the split among the second largest response values among the angular sizes displayed in the graph form. The method of claim 4,
The step of determining
Wherein the structure analyzing device determines a force for the torsion split of the structure by multiplying the size of the minimum point by the second largest response value, Way. In a structure analyzer in an environment where Torsion Split and Longi.Shear Split occur through the movement of a semi-submerged structure affected by the sea,
An extractor for extracting a torsion, a longitude shear, and a split having the largest response value among the response parameters received by the structure based on an analysis result of analyzing the motion of the structure;
A selector for selecting an angle of a torsion, a longevity shear, and a split having the largest response value extracted;
An estimator for estimating a second largest response value among the angle between the torsion and the split and the angle between the longitude share and the split, based on the selected angle;
A calculation unit for calculating a wave height using a design wave value obtained through an angle having the second largest response value and a preset response amplitude operator (RAO); And
And a determining unit determining a force received by the structure due to a load of the torsion split and the roof shear split reflected on the structure using the calculated wave height and the second largest response value. The method of claim 6,
The determining unit may multiply the magnitude of the minimum point determined based on the response value of the split on the basis of the estimated second largest response value and the second largest response value to determine a force on the roonish shear split which is a combined load of the structure, And the force for the split is determined.

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