CN116415463A - Ship simulation state data analysis method - Google Patents
Ship simulation state data analysis method Download PDFInfo
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- CN116415463A CN116415463A CN202310410457.9A CN202310410457A CN116415463A CN 116415463 A CN116415463 A CN 116415463A CN 202310410457 A CN202310410457 A CN 202310410457A CN 116415463 A CN116415463 A CN 116415463A
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- 238000004088 simulation Methods 0.000 title claims abstract description 36
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- 238000007405 data analysis Methods 0.000 title claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 31
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- G—PHYSICS
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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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
- B63B71/00—Designing vessels; Predicting their performance
- B63B71/10—Designing vessels; Predicting their performance using computer simulation, e.g. finite element method [FEM] or computational fluid dynamics [CFD]
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Abstract
The invention relates to the technical field of ship simulation, in particular to a ship simulation state data analysis method, which comprises the steps of constructing a ship finite element model by adopting computer modeling software; acquiring coordinate information of each node of a finite element model of a ship, and establishing a three-dimensional simulation image of the ship; converting the coordinates of each node into a geodetic coordinate system, and obtaining the displacement of the ship and the floating center coordinates thereof; acquiring a ship rolling restoring moment according to the ship displacement and the floating center coordinates, so as to calculate the instantaneous restoring force of the ship; acquiring the wave force of the ship, calculating a rolling restoring moment time course and a rolling movement time course according to the instantaneous restoring force and the wave force, acquiring rolling probability and rolling angle data under a certain probability value, and comparing the acquired rolling angle with a preset water inlet angle to judge the sailing state; according to the invention, the roll angle and the roll probability of the ship are calculated through simulation, so that the reliable roll angle and roll probability of the ship under the motion can be obtained, and the risk of the ship being overturned in sailing can be prevented and reduced.
Description
Technical Field
The invention relates to the technical field of ship simulation, in particular to a ship simulation state data analysis method.
Background
The ship operation is used as a current important transportation vehicle, the transportation performance of the ship in the sea is particularly important, the sea wave environment can interfere with the motions of six degrees of freedom of the ship, namely, heave, roll, pitch and head, and the motions of the six degrees of freedom are only pure oscillation motions of heave, roll and pitch, and the ship is distinguished from the other three motions in that when the disturbance greatly causes the ship to deviate from the balance position, the oscillation motions can be acted by restoring force and moment. The pure oscillating motion can generate larger acceleration, the ship-borne equipment is extremely easy to malfunction and the ship-crew motion sickness phenomenon is extremely easy to cause, the ship operation rate is seriously restricted, along with the technical development, the acquisition of a large amount of ship motion data is also realized, the problems are solved or avoided by simulating the ship motion, in the research at home and abroad, the roll angle and the corresponding roll probability are particularly important, and the application designs a ship simulation state data analysis method aiming at the problems, so as to prevent and reduce the problem of subversion in the ship roll motion.
Disclosure of Invention
Object of the invention
In order to solve the technical problems in the background technology, the invention provides a ship simulation state data analysis method.
(II) technical scheme
In order to solve the above problems, the present invention provides a method for analyzing ship simulation state data, comprising:
building a finite element model of the ship by adopting computer modeling software;
acquiring coordinate information of each node of a finite element model of a ship, and establishing a three-dimensional simulation image of the ship;
converting the coordinates of each node into a geodetic coordinate system, and obtaining the displacement of the ship and the floating center coordinates thereof;
acquiring a ship rolling restoring moment according to the ship displacement and the floating center coordinates, so as to calculate the instantaneous restoring force of the ship;
acquiring the wave force of the ship, and calculating a rolling restoring moment time course and a rolling movement time course according to the instantaneous restoring force and the wave force so as to acquire rolling probability and rolling angle data under a certain probability value;
and comparing the obtained roll angle with a preset water inlet angle to judge the sailing state.
As one embodiment of the present invention, converting the coordinates of each node to a geodetic coordinate system to obtain the displacement of the vessel and its floating center coordinates, comprises:
dividing ship nodes converted into a geodetic coordinate system along the sea wave transmission direction into a plurality of sections, wherein the sections correspond to the sea wave transmission direction;
and acquiring the projection length of the ship in the sea wave transmission direction, and calculating the information of each cross-sectional area and centroid coordinates according to the projection length.
As one embodiment of the present invention, the projection length n is divided by an equal ratio, and each divided projection length is set to m, and the water discharge V is calculated according to the following formula:
V＝(S1+S2+……Sk)*m。
as an embodiment of the present invention, the acquiring the ocean wave force of the ship includes:
dividing the ship into two parts which are bilaterally symmetrical and are marked as a left part and a right part;
the left part and the right part are set to be a plurality of cross sections, all the cross sections are sequentially combined into a parallelogram structure, and the parallelogram structure is symmetrical to the unselected ship parts so as to obtain all the parallelogram structures of the whole ship, and the coordinate conversion is carried out on all the parallelogram structures.
As one embodiment of the invention, triangular structure processing is carried out on the parallelogram structures, each parallelogram structure is split into two triangular structures, each triangular structure is calculated, and ocean wave force corresponding to each triangular structure is obtained;
integrating wave forces corresponding to all the triangular structures to obtain the wave force of the whole ship.
As an embodiment of the present invention, the calculating the roll recovery moment time course and the roll motion time course according to the instantaneous recovery force and the sea wave force includes:
calculating curves corresponding to the rolling restoring moment time course and the rolling movement time course by using the Darby principle;
and performing discretization analysis on the roll restoring moment time course and the roll movement time course curve to obtain the roll probability.
As an embodiment of the present invention, further comprising:
constructing a random sea wave model, and simulating the wave inclination angle of the ship;
and constructing a ship roll simulation model, and calculating a ship roll angle by using a convolution theorem and Laplaang inverse transformation.
As one embodiment of the invention, the random sea wave model is constructed, the wave inclination angle of the ship is simulated, g is gravity acceleration, and the expression formula of the wave height is as follows:
the wave spectrum function P (k) is expressed as:
A wave tilt energy spectral density function Pa (k);
Then the wave tilt angle is expressed as:
as one embodiment of the invention, the ship three-dimensional simulation image display device further comprises a display end used for displaying the three-dimensional simulation image visualization data of the ship.
As an embodiment of the present invention, the pitch angle and heave angle may be obtained according to the displacement and the coordinates of the floating center of the ship;
calculating relative errors according to the roll angle, the pitch angle and the heave angle, determining an error peak value according to the relative errors, and determining an error reduction optimal proportion according to the error peak value;
and correspondingly adjusting and reducing each input parameter data according to the optimal reduction proportion.
The technical scheme of the invention has the following beneficial technical effects:
according to the invention, the roll angle and the roll probability of the ship are calculated through simulation, the wave inclination angle of the ship is simulated through the wave random model, and the roll time course and the probability distribution of the ship are generated, so that the reliable roll angle and the roll probability under the ship motion are obtained, and the risk of the ship being overturned in sailing is prevented and reduced.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a flow chart of an embodiment of the method of the present invention.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
In the sailing process, sea waves and the self causes of the ship influence the ship, so that the ship can perform complex swinging motion, and the practicability and the navigation performance of the ship can be reduced to a certain extent. And the factors which have great influence on the ship in six degrees of freedom in ship coordinates during the ship rolling motion, so that the establishment of a ship motion mathematical model plays an important role in the continuous and forecast of the ship rolling motion.
As shown in fig. 1, the method for analyzing the ship simulation state data provided by the invention comprises the following steps:
step S100, building a finite element model of a ship by adopting computer modeling software; step S200, acquiring coordinate information of each node of a finite element model of a ship, and establishing a three-dimensional simulation image of the ship; step S300, converting the coordinates of each node into a geodetic coordinate system, and acquiring the displacement of the ship and the floating center coordinates thereof; step S400, acquiring a ship rolling restoring moment according to the ship displacement and the floating center coordinates, so as to calculate the instantaneous restoring force of the ship; step S500, obtaining the wave force of the ship, and calculating the rolling restoring moment time course and the rolling movement time course according to the instantaneous restoring force and the wave force so as to obtain the rolling probability and the rolling angle data under a certain probability value; step S600, comparing the obtained roll angle with a preset water inlet angle to judge the sailing state. As an example, the roll angle is smaller than the intake angle, and the ship is sailing normally; and if the roll angle is larger than the water inlet angle, adjusting the navigation state of the ship so that the roll angle is smaller than the water inlet angle.
Alternatively, if the roll probability is 3%, the roll probability may be further reduced.
In this embodiment, the converting the coordinates of each node to the geodetic coordinate system to obtain the displacement of the ship and the coordinates of the floating center thereof includes: dividing ship nodes converted into a geodetic coordinate system along the sea wave transmission direction into a plurality of sections, wherein the sections correspond to the sea wave transmission direction; and acquiring the projection length of the ship in the sea wave transmission direction, and calculating the information of each cross-sectional area and centroid coordinates according to the projection length.
Further, the projection length n is divided in equal proportion, each divided projection length is set to be m, and the water discharge V is calculated according to the following formula:
V＝(S1+S2+……Sk)*m。
referring to fig. 2, the acquiring the ocean wave force of the ship includes: dividing the ship into two parts which are bilaterally symmetrical and are marked as a left part and a right part; the left part and the right part are set to be a plurality of cross sections, all the cross sections are sequentially combined into a parallelogram structure, and the parallelogram structure is symmetrical to the unselected ship parts so as to obtain all the parallelogram structures of the whole ship, and the coordinate conversion is carried out on all the parallelogram structures.
It can be understood that the triangular structure processing is performed on the parallelogram structures, each parallelogram structure is split into two triangular structures, each triangular structure is calculated, and the sea wave force corresponding to each triangular structure is obtained; integrating wave forces corresponding to all the triangular structures to obtain the wave force of the whole ship.
The step of calculating the rolling restoring moment time course and the rolling movement time course according to the instantaneous restoring force and the sea wave force comprises the following steps: calculating curves corresponding to the rolling restoring moment time course and the rolling movement time course by using the Darby principle; and performing discretization analysis on the roll restoring moment time course and the roll movement time course curve to obtain the roll probability.
The invention also includes:
constructing a random sea wave model, and simulating the wave inclination angle of the ship; and constructing a ship roll simulation model, and calculating a ship roll angle by using a convolution theorem and Laplaang inverse transformation.
Because the interference of the sea waves is irregular, the wave length, wave height and wave period of the sea waves are random, the random wave height expression equation can be obtained by assuming that the random wave is formed by accumulating wave elements with different wave amplitudes, wave lengths and random phases.
The random sea wave model is constructed, the wave inclination angle of the ship is simulated, g is gravity acceleration, and the expression formula of the wave height is as follows:
the wave spectrum function P (k) is expressed as:
A wave tilt energy spectral density function Pa (k);
Then the wave tilt angle is expressed as:
however, in actual navigation, the sea condition of the ship and the ship's own volume will affect the wave inclination angle, so the above formula needs to be corrected in actual calculation, and the specific operation is determined according to the need, and will not be described here.
It is further understood that some embodiments of the present invention further include a display end, configured to display the three-dimensional simulation image of the ship.
In the step S400 of the present invention, the pitch angle and heave angle may be obtained according to the displacement and the coordinates of the floating center of the ship; calculating relative errors according to the roll angle, the pitch angle and the heave angle, determining an error peak value according to the relative errors, and determining an error reduction optimal proportion according to the error peak value; and correspondingly adjusting and reducing each input parameter data according to the optimal reduction proportion.
Specifically, a heave angle set, a roll angle set and a pitch angle set are established.
And obtaining peak errors according to the set, and confirming the parameter reduction proportion by the determined peak errors.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed.
Claims (10)
1. The ship simulation state data analysis method is characterized by comprising the following steps of:
building a finite element model of the ship by adopting computer modeling software;
acquiring coordinate information of each node of a finite element model of a ship, and establishing a three-dimensional simulation image of the ship;
converting the coordinates of each node into a geodetic coordinate system, and obtaining the displacement of the ship and the floating center coordinates thereof;
acquiring a ship rolling restoring moment according to the ship displacement and the floating center coordinates, so as to calculate the instantaneous restoring force of the ship;
acquiring the wave force of the ship, and calculating a rolling restoring moment time course and a rolling movement time course according to the instantaneous restoring force and the wave force so as to acquire rolling probability and rolling angle data under a certain probability value;
and comparing the obtained roll angle with a preset water inlet angle to judge the sailing state.
2. The method for analyzing the ship simulation state data according to claim 1, wherein the converting the coordinates of each node to the geodetic coordinate system to obtain the displacement of the ship and the coordinates of the floating center thereof comprises:
dividing ship nodes converted into a geodetic coordinate system along the sea wave transmission direction into a plurality of sections, wherein the sections correspond to the sea wave transmission direction;
and acquiring the projection length of the ship in the sea wave transmission direction, and calculating the information of each cross-sectional area and centroid coordinates according to the projection length.
3. The ship simulation state data analysis method according to claim 2, wherein the projection length n is divided by equal ratio, and each divided projection length is set to m, and the displacement V is calculated according to the following formula:
V＝(S1+S2+……Sk)*m。
4. the method for analyzing ship simulation state data according to claim 1, wherein the acquiring the ship wave force comprises:
dividing the ship into two parts which are bilaterally symmetrical and are marked as a left part and a right part;
the left part and the right part are set to be a plurality of cross sections, all the cross sections are sequentially combined into a parallelogram structure, and the parallelogram structure is symmetrical to the unselected ship parts so as to obtain all the parallelogram structures of the whole ship, and the coordinate conversion is carried out on all the parallelogram structures.
5. The ship simulation state data analysis method of claim 4, wherein the parallelogram structures are subjected to triangle structure processing, each parallelogram structure is split into two triangle structures, each triangle structure is calculated, and ocean wave force corresponding to each triangle structure is obtained;
integrating wave forces corresponding to all the triangular structures to obtain the wave force of the whole ship.
6. The ship simulation state data analysis method of claim 1, wherein the calculating the roll recovery moment time course and the roll motion time course according to the instantaneous recovery force and the sea wave force comprises:
calculating curves corresponding to the rolling restoring moment time course and the rolling movement time course by using the Darby principle;
and performing discretization analysis on the roll restoring moment time course and the roll movement time course curve to obtain the roll probability.
7. The ship simulation state data analysis method of claim 1, further comprising:
constructing a random sea wave model, and simulating the wave inclination angle of the ship;
and constructing a ship roll simulation model, and calculating a ship roll angle by using a convolution theorem and Laplaang inverse transformation.
8. The method for analyzing ship simulation state data according to claim 7, wherein the random sea wave model is constructed to simulate the wave inclination angle of the ship, g is gravity acceleration, and the expression formula of the wave height is as follows:
the wave spectrum function P (k) is expressed as:
A wave tilt energy spectral density function Pa (k);
Then the wave tilt angle is expressed as:
9. the ship simulation state data analysis method of claim 1, further comprising a display end for displaying the visualized data of the three-dimensional simulation image of the ship.
10. The method for analyzing the ship simulation state data according to claim 1, wherein the pitch angle and heave angle can be obtained according to the ship displacement and the floating center coordinates;
calculating relative errors according to the roll angle, the pitch angle and the heave angle, determining an error peak value according to the relative errors, and determining an error reduction optimal proportion according to the error peak value;
and correspondingly adjusting and reducing each input parameter data according to the optimal reduction proportion.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117390762A (en) * | 2023-09-15 | 2024-01-12 | 中国人民解放军92942部队 | Full-flow ship safety design analysis method |
| CN117556623A (en) * | 2023-11-21 | 2024-02-13 | 中国舰船研究设计中心 | Digital twinning-based large ship navigation kinematic model construction method |
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2023
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117390762A (en) * | 2023-09-15 | 2024-01-12 | 中国人民解放军92942部队 | Full-flow ship safety design analysis method |
| CN117390762B (en) * | 2023-09-15 | 2024-05-14 | 中国人民解放军92942部队 | Full-flow ship safety design analysis method |
| CN117556623A (en) * | 2023-11-21 | 2024-02-13 | 中国舰船研究设计中心 | Digital twinning-based large ship navigation kinematic model construction method |
| CN117556623B (en) * | 2023-11-21 | 2024-04-09 | 中国舰船研究设计中心 | Digital twinning-based large ship navigation kinematic model construction method |
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