KR20160114963A - Methods for modelling explosion pressure time history model - Google Patents
Methods for modelling explosion pressure time history model Download PDFInfo
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- KR20160114963A KR20160114963A KR1020150041511A KR20150041511A KR20160114963A KR 20160114963 A KR20160114963 A KR 20160114963A KR 1020150041511 A KR1020150041511 A KR 1020150041511A KR 20150041511 A KR20150041511 A KR 20150041511A KR 20160114963 A KR20160114963 A KR 20160114963A
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- G06F17/5004—
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B29/00—Accommodation for crew or passengers not otherwise provided for
- B63B29/02—Cabins or other living spaces; Construction or arrangement thereof
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/94—Protection against other undesired influences or dangers against fire
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
- B63B2017/0045—Caps, hoods, or the like devices for protective purposes, not otherwise provided for
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- Ocean & Marine Engineering (AREA)
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Abstract
A method of modeling an explosion pressure time history model is disclosed. According to an aspect of the present invention, there is provided a method for controlling an explosion pressure, comprising: a first step of analyzing an explosion pressure acting on a blast wall by explosion scenarios to obtain explosion pressure time history data for each explosion scenario; A second step of deriving an exceedance curve representing a relationship between an exceedance frequency and an overpressure on the basis of a maximum explosion pressure per explosion scenario and an occurrence frequency of the explosion scenario; A third step of deriving an oversized pressure according to a preset excess frequency from the excess curve as a design pressure; A fourth step of determining an oversized pressure within a predetermined range around the design pressure as a design pressure range; A fifth step of selecting explosion pressure time history data in which the maximum explosion pressure is within the design pressure range among the explosion pressure time history data as modeling object data; And a sixth step of modeling an explosion pressure time history model including a positive pressure section and a negative pressure section based on the design pressure and the modeling object data.
Description
The present invention relates to a method of modeling an explosion pressure time history model.
In offshore structures that produce, store and / or process crude oil or gas, there is a risk of explosion due to gas leakage or the like. A blast wall may be installed for the purpose of protecting utility or living quarters from explosion shocks in the event of an explosion in an offshore plant. Therefore, explosion structure analysis should precede the blast wall design, and explosion pressure time history model should be reflected in explosion structure analysis.
BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2015-0004185 (Jan. 201, 2015, Combustion explosion-proof structure of a marine plant and method of construction thereof).
Embodiments of the present invention can provide a method of modeling an explosion pressure time history model capable of modeling an explosion pressure time history model used in an explosion structure analysis of a blast wall.
According to an aspect of the present invention, there is provided a method for controlling an explosion pressure, comprising: a first step of analyzing an explosion pressure acting on a blast wall by explosion scenarios to obtain explosion pressure time history data for each explosion scenario; A second step of deriving an exceedance curve representing a relationship between an exceedance frequency and an overpressure on the basis of a maximum explosion pressure per explosion scenario and an occurrence frequency of the explosion scenario; A third step of deriving an oversized pressure according to a preset excess frequency from the excess curve as a design pressure; A fourth step of determining an oversized pressure within a predetermined range around the design pressure as a design pressure range; A fifth step of selecting explosion pressure time history data in which the maximum explosion pressure is within the design pressure range among the explosion pressure time history data as modeling object data; And a sixth step of modeling an explosion pressure time history model including a positive pressure section and a negative pressure section based on the design pressure and the modeling object data.
Wherein the positive pressure section of the explosion pressure time history model includes a maximum positive pressure P max and a positive pressure duration T p and the negative pressure section of the explosion pressure time history model includes a maximum negative pressure P min and a negative pressure duration T n ).
(6-1) the maximum static pressure (P max ) is determined as the design pressure; (P min ), the positive pressure duration (T p ), and the negative pressure duration (T n ) based on the maximum static pressure (P max ) and the modeling object data .
In the second step 6-2, the static-pressure duration (T p) is the maximum static pressure (P max) the first and second mean value of which the summation of the positive pressure area and the explosion interval pressure time history of the modeled object data when the determination Wherein the negative pressure duration (T n ) is determined as an average value of a duration of a first negative pressure interval of the modeling object data, and the maximum negative pressure (P min ) If the time T n is determined, the average value of the summed area of the first and second negative pressure sections of the modeling object data may be calculated to be equal to the area of the negative pressure section of the explosion pressure time history model.
According to the embodiments of the present invention, it is possible to reflect the explosion pressure time history model most similar to the design pressure considering not only the constant pressure section but also the negative pressure section during the explosion structure analysis.
1 is a view showing an offshore structure in which a blast wall is installed.
2 is a diagram illustrating a modeling method of an explosion pressure time history model according to an embodiment of the present invention.
3 is a diagram showing explosion pressure time history data.
4 is a diagram showing an excess curve.
FIG. 5 is a view showing modeling target data selected from explosion pressure time history data. FIG.
6 is a diagram showing an explosion pressure time history model.
The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.
In the present application, when a component is referred to as "comprising ", it means that it can include other components as well, without excluding other components unless specifically stated otherwise. Also, throughout the specification, the term "on" means to be located above or below the object portion, and does not necessarily mean that the object is located on the upper side with respect to the gravitational direction.
Furthermore, the term " coupled " does not mean that only a physical contact is made between the respective components in the contact relationship between the respective components, but the other components are interposed between the respective components, It should be used as a concept to cover until the components are in contact with each other.
The sizes and thicknesses of the respective components shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.
The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, an embodiment of a method of modeling an explosion pressure time history model according to the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals designate like or corresponding components And redundant explanations thereof will be omitted.
1 is a view showing an offshore structure in which a blast wall is installed.
Referring to FIG. 1, a
The explosion structure analysis should precede the design of the blast wall (10), and the explosion pressure time history model should be reflected in the explosion structure analysis.
The explosion pressure time history model is a simplified model which analyzes the explosion pressure time histories of various explosion scenarios and can be expressed as a triangle on the graph showing the relationship between pressure and time.
2 is a diagram illustrating a modeling method of an explosion pressure time history model according to an embodiment of the present invention.
Referring to FIG. 2, a method for modeling an explosion pressure time history model according to an embodiment of the present invention includes a step S100 of obtaining explosion pressure time history data, a step S110 of deriving an excess curve, (S140) of deriving the pressure, deriving a design pressure range (S130), selecting modeling object data from the explosion pressure time history data (S140), and modeling the explosion pressure time history model based on the modeling object data (Step S150).
First, the explosion pressure acting on the blast wall is analyzed for each explosion scenario, and the explosion pressure time history data for each explosion scenario can be obtained (S100).
The explosion scenario can be assumed to be a plurality of scenarios depending on the gas leakage region, direction, and the like. Explosion pressure time history data can be obtained by analyzing how the explosion pressure acting on the blast wall appears over time for each explosion scenario. Explosion scenario analysis methods, such as explosion hazard assessment (ERA), which are capable of obtaining explosion pressure time history data, are well known in the art and will not be described in detail here.
3 is a diagram showing explosion pressure time history data.
Referring to FIG. 3, explosion pressure time history data of explosion scenarios are shown in different colors.
Next, an excess curve indicating the relationship between the overfrequency pressure and the overfrequency can be derived based on the maximum explosion pressure and the occurrence frequency of the explosion scenario per explosion scenario (S110).
The maximum explosion pressure per explosion scenario can be determined by the maximum explosion pressure in the explosion pressure time history data according to the explosion scenario.
The frequency of occurrence of the explosion scenario may refer to the frequency at which the explosion scenario may occur.
The method of deriving the exceedance curve based on the maximum explosion pressure and the occurrence frequency of the explosion scenario according to the explosion scenario is well known in the related art, and a detailed description thereof will be omitted.
4 is a diagram showing an excess curve.
Referring to FIG. 4, the excess curve may represent a relationship between an exceedance frequency and an overpressure.
Next, the overpressure according to the predetermined excess frequency from the excess curve can be derived as the design pressure (S120).
The excess frequency for deriving the design pressure can be set (targeted) according to the ship owner's demand or the like. For example, the excess frequency may be set to 10,000 years as shown in FIG.
With the overfrequency set as described above, the design pressure can be derived using an overshoot curve, with the overfrequency having a predetermined value.
Next, the overpressure within a predetermined range around the design pressure can be determined as the design pressure range (S130).
The design pressure range can be determined by the overpressure within a predetermined range around the design pressure. The design pressure range can be set, for example, within the range of ± 10% of the design pressure.
Next, the explosion pressure time history data in which the maximum explosion pressure is within the design pressure range among the explosion pressure time history data can be selected as modeling object data (S140).
FIG. 5 is a view showing modeling target data selected from explosion pressure time history data. FIG.
Referring to FIG. 5, only the explosion pressure time history data in which the maximum explosion pressure is within the design pressure range among the explosion pressure time history data of FIG. 3 are shown in different colors.
In the modeling method of the explosion pressure time hysteresis model according to an embodiment of the present invention, there is no explosion pressure time history data in which the maximum explosion pressure becomes equal to the design pressure in reality. All of the explosion pressure time history data in which the maximum explosion pressure is within the design pressure range by setting the design pressure range unlike the prior art in which one explosion pressure time history data is selected and scaled and determined as modeling object data, Data can be selected.
Next, the explosion pressure time history model including the positive pressure section and the negative pressure section may be modeled based on the design pressure and the modeling object data (S150).
6 is a diagram showing an explosion pressure time history model.
Referring to FIG. 6, the explosion pressure time history model may include a positive pressure section and a negative pressure section. The positive pressure section may refer to a time region where positive pressure acts on the blast wall and the negative pressure section may refer to a time region where negative pressure acts on the blast wall. The positive pressure section and the negative pressure section can be represented by triangles in the pressure-time graph, respectively. Positive pressure section may include a maximum static pressure (P max) and the static-pressure duration (T p), the negative pressure section may include a maximum negative pressure (P min) and a negative pressure duration (T n). That is, modeling of the explosion pressure time history model may mean determining the maximum static pressure (P max ), the constant pressure duration (T p ), the maximum negative pressure (P min ) and the negative pressure duration (T n ).
The maximum static pressure (P max ) can be determined by the design pressure. That is, the maximum static pressure P max can be determined to be the same as the design pressure.
Derived as the maximum static pressure (P max) is, the maximum static pressure (P max) and the continuous positive pressure on the basis of the modeled data, the time (T p), the negative pressure duration (T n) and the maximum negative pressure (P min) after a predetermined time can do.
The process of deriving the constant pressure duration (T p ) may be as follows. First, after calculating the summed area of the first and second constant pressure sections along the time axis for each modeling object data, the summed areas of all the modeling object data are summed up, and the number of modeling object data (for example, ), The average value of the summed area can be calculated. Next, the constant pressure duration (T p ) at which the area of the constant pressure section of the explosion pressure time history model becomes equal to the average value of the sum area can be simply calculated since the maximum static pressure (P max ) has already been determined, or And can be determined to be the same as the predetermined static pressure design time.
The negative pressure duration T n is determined as an average value calculated by summing the duration of the first negative pressure interval along the time axis of the entire modeling object data and dividing by the number of modeling object data (for example, nine in FIG. 5) .
The process of deriving the maximum negative pressure (P min ) may be as follows. First, the total area of the first, first and second negative pressure sections along the time axis is calculated for each modeling object data, the summed areas of all the modeling object data are summed up, and the number of modeling object data (for example, 9), the average value of the summed area can be calculated. Next, the maximum negative pressure P min at which the area of the negative pressure section of the explosion pressure time history model becomes equal to the average value of the summed area can be simply calculated since the negative pressure duration T n has already been determined.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention as set forth in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.
10: Blast month 20: Offshore structures
Claims (4)
A second step of deriving an exceedance curve representing a relationship between an exceedance frequency and an overpressure on the basis of a maximum explosion pressure per explosion scenario and an occurrence frequency of the explosion scenario;
A third step of deriving an oversized pressure according to a preset excess frequency from the excess curve as a design pressure;
A fourth step of determining an oversized pressure within a predetermined range around the design pressure as a design pressure range;
A fifth step of selecting explosion pressure time history data in which the maximum explosion pressure is within the design pressure range among the explosion pressure time history data as modeling object data; And
And a sixth step of modeling an explosion pressure time history model including a pressure section and a negative pressure section based on the design pressure and the modeling object data.
The constant pressure section of the explosion pressure time history model includes a maximum static pressure ( Pmax ) and a constant pressure duration ( Tp )
Wherein the negative pressure section of the explosion pressure time history model includes a maximum negative pressure (P min ) and a negative pressure duration (T n ).
In the sixth step,
The maximum static pressure P max is determined as the design pressure; And
(P min ), the positive pressure duration (T p ), and the negative pressure duration (T n ) based on the maximum static pressure (P max ) and the modeling object data Modeling method of explosion pressure time history model.
In the step 6-2,
If the maximum static pressure P max is determined, the static pressure duration T p is equal to the average value of the summed area of the first and second constant-pressure sections of the modeling object data and the area of the static pressure section of the explosion pressure time- Lt; / RTI >
The negative pressure duration T n is determined as an average value of the duration of the first negative pressure interval of the modeling object data,
If the negative pressure duration (T n ) is determined, the maximum negative pressure (P min ) is equal to the average value of the sum area of the first and second negative pressure sections of the modeling object data and the area of the negative pressure section of the explosion pressure time- A method of modeling an explosion pressure time history model to be calculated.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110866296A (en) * | 2019-09-29 | 2020-03-06 | 中国人民解放军空军工程大学 | Method for rapidly evaluating damage capability of explosive shock waves to fixed target |
| CN112784393A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Explosion overpressure evaluation method and device and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007239413A (en) * | 2006-03-13 | 2007-09-20 | Sumitomo Chemical Co Ltd | Design method for pressure-discharge door |
| JP2010244531A (en) * | 2009-04-01 | 2010-10-28 | Livermore Software Technology Corp | Explosion simulation in finite element analysis |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007239413A (en) * | 2006-03-13 | 2007-09-20 | Sumitomo Chemical Co Ltd | Design method for pressure-discharge door |
| JP2010244531A (en) * | 2009-04-01 | 2010-10-28 | Livermore Software Technology Corp | Explosion simulation in finite element analysis |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110866296A (en) * | 2019-09-29 | 2020-03-06 | 中国人民解放军空军工程大学 | Method for rapidly evaluating damage capability of explosive shock waves to fixed target |
| CN112784393A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Explosion overpressure evaluation method and device and storage medium |
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