CN116432491A - Method and system for judging implosion failure mechanism of deep-sea metal pressure-resistant shell based on modal displacement - Google Patents
Method and system for judging implosion failure mechanism of deep-sea metal pressure-resistant shell based on modal displacement Download PDFInfo
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Abstract
The invention provides a method and a system for judging an implosion failure mechanism of a deep-sea metal pressure housing based on modal displacement, wherein the method comprises the following steps: modeling a finite element model of the deep sea metal pressure shell, and numbering nodes of the finite element model; performing eigenvalue buckling analysis on the finite element model to obtain a front N-order modal displacement result; obtaining initial geometric defects of a local single-mode defect method or a combined-mode defect method based on each-order modal displacement result; scaling the initial geometric defects according to the geometric out-of-roundness requirement of the pressure shell to obtain final geometric defect displacement of the deep sea pressure structure; modeling the results of different final geometric defect displacements to obtain a final structural finite element model, and judging the implosion failure form of the deep sea metal pressure shell by using the obtained final structural finite element model; and carrying out implosion fluid-solid coupling calculation verification on the metal pressure shell in the deep sea environment, and judging the implosion failure mode of the deep sea metal pressure shell by utilizing a final structure finite element model.
Description
Technical Field
The invention relates to the field of modeling and evaluation of deep-sea metal pressure-resistant structures, in particular to a method and a system for judging an implosion failure mechanism of a deep-sea metal pressure-resistant shell based on modal displacement.
Background
The deep sea metal pressure-resistant shell is an important component of an underwater vehicle and a manned submersible vehicle, and needs to bear external hydrostatic pressure in different water depth environments to provide an operation environment for internal non-pressure-resistant components. At present, the judgment of an underwater implosion mechanism of a metal pressure shell is generally carried out by directly adopting a fluid-solid coupling method for numerical calculation, and the method is based on the interaction of fluid on the surface of the pressure shell and a structure, and realizes the judgment of an implosion failure mechanism through the transmission of force and displacement in the calculation process.
However, in practical engineering, it is found that the deep sea metal pressure shell has the defects of initial geometry and materials with different sizes in design and manufacture due to the complex structure. Therefore, when the fluid-solid coupling algorithm is directly adopted for numerical calculation, on one hand, a strong calculation capability is required, which causes great calculation cost. On the other hand, the structural defect cannot be fully considered, and errors of the numerical simulation result are caused.
The invention carries out modal calculation on the deep-sea metal pressure-resistant structure by adopting a finite element method, considers the geometric out-of-roundness requirement of the structure, can scientifically judge the failure mechanism of the deep-sea metal pressure-resistant structure, and has important engineering application value for the design and manufacture of deep-sea equipment such as underwater vehicles, manned deep submarines and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a system for judging an implosion failure mechanism of a deep-sea metal pressure-resistant shell based on modal displacement.
The invention provides a method for judging an implosion failure mechanism of a deep-sea metal pressure housing based on modal displacement, which comprises the following steps:
step S1: modeling a structural finite element model of the deep sea metal pressure-resistant shell to obtain a finite element model, and numbering nodes of the finite element model;
step S2: performing eigenvalue buckling analysis on the finite element model by adopting a finite element method to obtain a front N-order modal displacement result;
step S3: obtaining initial geometric defects of a local single-mode defect method or a combined-mode defect method based on each-order modal displacement result;
step S4: scaling the initial geometric defects according to the geometric out-of-roundness requirement of the pressure shell to obtain final geometric defect displacement of the deep sea pressure structure;
step S5: modeling finite element models is carried out on the results of different final geometric defect displacements to obtain a final structural finite element model, and the obtained final structural finite element model is utilized to judge the implosion failure mode of the deep sea metal pressure shell;
step S6: and carrying out implosion fluid-solid coupling calculation on the metal pressure shell in the deep sea environment, and judging the implosion failure mode of the deep sea metal pressure shell by verifying and utilizing the final structure finite element model.
Preferably, the step S3 employs: acquiring a certain-order modal result based on each-order modal displacement result to obtain an initial geometric defect of a single-modal defect method; or based on the modal displacement results of each order, carrying out partial or total superposition to obtain the defect geometrical defect of the combined modal defect method.
Preferably, the step S4 employs: and scaling the initial geometric defect displacement by taking the geometric out-of-roundness requirement of the pressure shell as a scaling factor to obtain the final geometric defect displacement.
Preferably, the step S5 employs: adding the node number m corresponding to the final node defect displacement to the node number n of the structural finite element model i Obtaining a final structure finite element model;
wherein, consider the node position of the deep sea metal pressure shell based on modal displacement as follows:
n n，i(x，y) ＝n i +m i
wherein n is n，i(x，y) The position corresponding to the unit node number i after the displacement is superimposed based on the previous N-order mode is shown.
Preferably, the step S6 employs: and carrying out implosion fluid-solid coupling calculation on the metal pressure-resistant shell in the deep sea environment by adopting a fluid-solid coupling algorithm.
The invention provides a system for judging an implosion failure mechanism of a deep-sea metal pressure housing based on modal displacement, which comprises the following components:
module M1: modeling a structural finite element model of the deep sea metal pressure-resistant shell to obtain a finite element model, and numbering nodes of the finite element model;
module M2: performing eigenvalue buckling analysis on the finite element model by adopting a finite element method to obtain a front N-order modal displacement result;
module M3: obtaining initial geometric defects of a local single-mode defect method or a combined-mode defect method based on each-order modal displacement result;
module M4: scaling the initial geometric defects according to the geometric out-of-roundness requirement of the pressure shell to obtain final geometric defect displacement of the deep sea pressure structure;
module M5: modeling finite element models is carried out on the results of different final geometric defect displacements to obtain a final structural finite element model, and the obtained final structural finite element model is utilized to judge the implosion failure mode of the deep sea metal pressure shell;
module M6: and carrying out implosion fluid-solid coupling calculation on the metal pressure shell in the deep sea environment, and judging the implosion failure mode of the deep sea metal pressure shell by verifying and utilizing the final structure finite element model.
Preferably, the module M3 employs: acquiring a certain-order modal result based on each-order modal displacement result to obtain an initial geometric defect of a single-modal defect method; or based on the modal displacement results of each order, carrying out partial or total superposition to obtain the defect geometrical defect of the combined modal defect method.
Preferably, the module M4 employs: and scaling the initial geometric defect displacement by taking the geometric out-of-roundness requirement of the pressure shell as a scaling factor to obtain the final geometric defect displacement.
Preferably, the module M5 employs: node number m corresponding to final node defect displacement i Added to the structure finite element model node number n i Obtaining a final structure finite element model;
wherein, consider the node position of the deep sea metal pressure shell based on modal displacement as follows:
n n，i(x，y) ＝n i +m i
wherein n is n，i(x，y) The position corresponding to the unit node number i after the displacement is superimposed based on the previous N-order mode is shown.
Preferably, the module M6 employs: and carrying out implosion fluid-solid coupling calculation on the metal pressure-resistant shell in the deep sea environment by adopting a fluid-solid coupling algorithm.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention considers the initial defects of the deep sea metal pressure-resistant shell based on the single defect mode method and the integral defect mode method, and can meet the design and construction requirements of the underwater vehicle.
2. According to the invention, the single mode displacement and the integral mode displacement result are scaled based on the out-of-roundness coefficient of the radius, so that the quick judgment of the implosion failure mode of the deep-sea metal pressure shell is realized.
3. According to the invention, through calculating the evolution characteristics of the deep-sea metal pressure-resistant shell after the implosion failure, the inversion control of the mutual correlation of the underwater implosion and the modal displacement is realized.
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Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of a method for judging a mechanism of implosion failure of a deep sea metal pressure housing based on modal displacement.
FIG. 2 is a schematic diagram of a finite element model of a deep sea titanium alloy annular rib cylindrical shell structure.
FIG. 3 is a schematic representation of the results of the front 6-order modal displacement of a deep sea titanium alloy annular rib cylindrical shell.
Fig. 4 is a schematic diagram of a finite element model of a deep-sea titanium alloy annular rib cylindrical shell after superposition of a single 1-order mode and a first 6-order mode.
Fig. 5 is a schematic view of the ultimate strength of a deep sea titanium alloy annular rib cylindrical shell.
FIG. 6 is a schematic diagram of two modal displacement based deep sea titanium alloy annular rib cylindrical shell implosion failure mechanisms.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Aiming at the problem of judging the implosion failure mechanism of the deep-sea metal pressure-resistant shell in the deep sea, the invention aims to provide the method and the system for judging the implosion failure mechanism of the deep-sea metal pressure-resistant shell based on modal displacement, which can accurately judge the implosion failure mode of the deep-sea metal pressure-resistant shell, provide a basis for the subsequent evaluation of the ultimate strength, the structural dynamic response and the like of the structure based on the model, and aim to provide theoretical basis and practical basis for the design and the manufacture of deep-sea underwater vehicles and manned submarines.
Example 1
The invention provides a method for judging an implosion failure mechanism of a deep-sea metal pressure housing based on modal displacement, which comprises the following steps:
step S1: modeling a structural finite element model of the deep sea metal pressure-resistant shell to obtain a finite element model, and numbering nodes of the finite element model;
step S2: performing eigenvalue buckling analysis on the finite element model by adopting a finite element method to obtain a front N-order modal displacement result;
step S3: obtaining initial geometric defects of a local single-mode defect method or a combined-mode defect method based on each-order modal displacement result;
step S4: scaling the initial geometric defects according to the geometric out-of-roundness requirement of the pressure shell to obtain final geometric defect displacement of the deep sea pressure structure;
step S5: modeling finite element models is carried out on the results of different final geometric defect displacements to obtain a final structural finite element model, and the obtained final structural finite element model is utilized to judge the implosion failure mode of the deep sea metal pressure shell;
step S6: and carrying out implosion fluid-solid coupling calculation on the metal pressure shell in the deep sea environment, and judging the implosion failure mode of the deep sea metal pressure shell by verifying and utilizing the final structure finite element model.
Specifically, the step S3 employs: acquiring a certain-order modal result based on each-order modal displacement result to obtain an initial geometric defect of a single-modal defect method; or based on the modal displacement results of each order, carrying out partial or total superposition to obtain the defect geometrical defect of the combined modal defect method.
Specifically, the step S4 employs: and scaling the initial geometric defect displacement by taking the geometric out-of-roundness requirement of the pressure shell as a scaling factor to obtain the final geometric defect displacement.
Specifically, the step S5 employs: node number m corresponding to final node defect displacement i Added to the structure finite element model node number n i Obtaining a final structure finite element model;
wherein, consider the node position of the deep sea metal pressure shell based on modal displacement as follows:
n n，i(x，y) ＝n i +m i
wherein n is n，i(x，y) The position corresponding to the unit node number i after the displacement is superimposed based on the previous N-order mode is shown.
Specifically, the step S6 employs: and carrying out implosion fluid-solid coupling calculation on the metal pressure-resistant shell in the deep sea environment by adopting a fluid-solid coupling algorithm.
The invention provides a system for judging an implosion failure mechanism of a deep-sea metal pressure housing based on modal displacement, which comprises the following components:
module M1: modeling a structural finite element model of the deep sea metal pressure-resistant shell to obtain a finite element model, and numbering nodes of the finite element model;
module M2: performing eigenvalue buckling analysis on the finite element model by adopting a finite element method to obtain a front N-order modal displacement result;
module M3: obtaining initial geometric defects of a local single-mode defect method or a combined-mode defect method based on each-order modal displacement result;
module M4: scaling the initial geometric defects according to the geometric out-of-roundness requirement of the pressure shell to obtain final geometric defect displacement of the deep sea pressure structure;
module M5: modeling finite element models is carried out on the results of different final geometric defect displacements to obtain a final structural finite element model, and the obtained final structural finite element model is utilized to judge the implosion failure mode of the deep sea metal pressure shell;
module M6: and carrying out implosion fluid-solid coupling calculation on the metal pressure shell in the deep sea environment, and judging the implosion failure mode of the deep sea metal pressure shell by verifying and utilizing the final structure finite element model.
Specifically, the module M3 employs: acquiring a certain-order modal result based on each-order modal displacement result to obtain an initial geometric defect of a single-modal defect method; or based on the modal displacement results of each order, carrying out partial or total superposition to obtain the defect geometrical defect of the combined modal defect method.
Specifically, the module M4 employs: and scaling the initial geometric defect displacement by taking the geometric out-of-roundness requirement of the pressure shell as a scaling factor to obtain the final geometric defect displacement.
Specifically, the module M5 employs: node number m corresponding to final node defect displacement i Added to the structure finite element model node number n i Obtaining a final structure finite element model;
wherein, consider the node position of the deep sea metal pressure shell based on modal displacement as follows:
n n，i(x，y) ＝n i +m i
wherein n is n，i(x，y) The position corresponding to the unit node number i after the displacement is superimposed based on the previous N-order mode is shown.
Specifically, the module M6 employs: and carrying out implosion fluid-solid coupling calculation on the metal pressure-resistant shell in the deep sea environment by adopting a fluid-solid coupling algorithm.
Example 2
Example 2 is a preferred example of example 1
According to the method for judging the implosion failure mechanism of the deep-sea metal pressure housing based on modal displacement, which is provided by the invention, as shown in fig. 1, the method comprises the following steps:
step 1: modeling a finite element model of the deep sea metal pressure shell;
structural finite element modeling is performed on a deep sea metal pressure shell, and a shell unit is generally adopted because an application object is generally in a spherical or cylindrical thin shell structure, and a cylindrical titanium alloy pressure shell finite element model is shown in fig. 2. Let the node number of the finite element model be denoted as n i 。
Step 2: performing eigenvalue buckling analysis on the finite element model to obtain a front N-order modal displacement result of the structure;
and performing eigenvalue buckling analysis on the finite element model by adopting a finite element method to obtain a front 6-order modal displacement result, as shown in figure 3. And respectively recording the total node numbers corresponding to the modal displacement results as m 1，i 、m 2，i 、m 3，i 、m 4，i 、m 5，i 、m 6，i . Wherein the subscripts 1-6 represent the corresponding modality orders and the subscript i represents the node number of the finite element model.
Step 3: partially or completely superposing the modal displacement results of each order to obtain initial geometric defects of a local single-mode defect method and a whole combined-mode defect method;
the single-mode defect displacement result is that a certain order in analysis of characteristic value buckling is taken as an initial defect of a structure, and the defect displacement result of multi-mode superposition combination is that a plurality of characteristic value buckling mode results are simultaneously introduced into one model, so that a finite element structure model with a multi-order mode displacement defect form is formed. Using python self-compiler to obtain the modal result m of cylindrical pressure shell corresponding to finite element node number 1，i ～m 6，i Superposing to obtain an initial geometric defect based on a modal displacement result:
m n，i ＝m 1，i +m 2，i +...+m N-1，i +m N，i
wherein m is n，i Representing the sum of the modal displacement stacks of all nodes of the first N-order modes.
Step 4: scaling the initial geometric defects according to the geometric out-of-roundness requirement of the pressure shell, wherein the numerical result is used as the final geometric defect displacement of the deep sea pressure structure;
for deep sea metal pressure shells, the effect of manufacturing errors needs to be taken into account. For a cylindrical annular rib cylindrical shell, 0.5% was taken as the initial out-of-roundness. Scaling the initial geometric defect displacement obtained based on the modal superposition method by adopting a python self-compiling program and taking the out-of-roundness requirement as a scaling factor to obtain the final geometric defect displacement of the deep-sea titanium alloy pressure shell, wherein the node number corresponding to the final defect displacement is m i 。
m i ＝0.5％×m n，i
Wherein m is i And representing the unit node number after the initial out-of-roundness is considered and the displacement is overlapped based on the first N-order mode.
Step 5: modeling the finite element models according to the sequence of calculation, obtaining a final finite element model, and judging the implosion failure mode of the deep sea metal pressure-resistant shell by using the final finite element model;
adopting python self-compiling program to realize node number m corresponding to final node defect displacement of deep sea annular rib cylindrical shell i Respectively and sequentially adding the two nodes to the node number n of the structure finite element model i And finally, obtaining the final annular rib cylindrical shell implosion calculation structure model. The node positions of the deep sea metal pressure shell based on modal displacement are considered as follows:
n n，i(x，y) ＝n i +m i
wherein n is n，i(x，y) The position corresponding to the unit node number i after the displacement is superimposed based on the previous N-order mode is shown.
And according to the superposition displacement result of each order of modes, obtaining a structural finite element model considering initial defects, as shown in fig. 4. In the finite element structural model in which the first-order buckling mode results are obtained as initial defects of the annular rib cylindrical shell, the annular rib cylindrical shell is slightly recessed only at the center surface position, and the other positions are basically unchanged. It is therefore predicted that the deep sea annular rib cylindrical shell will begin to dent inwardly at the central location first and fail preferentially at the central location. With the evolution of implosion, the collapse of the center position gradually expands toward both ends, eventually leading to failure of the entire structure. It is envisioned that the final stage will remain relatively intact with the annular rib cylindrical shell having the first-order bending mode displacement as an initial defect.
When the number of modes of the initial geometric defect is 6, the adjacent buckling ultimate strength is increased, the surface of the structure presents the defect displacement characteristic of multi-order modes, and the surface is slightly concave. Therefore, in an implosion failure mechanism of the first 6-order mode displacement superposition, the annular rib cylindrical shell structure presents the concave characteristic of a multi-order mode on the surface, and the middle section of the cylindrical shell is failed and broken at almost the same time along with the development of implosion, so that a relatively complete structure is not reserved.
In addition, based on a finite element model considering the initial defects of the structure and geometry, the result of carrying out limit bearing calculation on the model by adopting an arc length method is shown in fig. 5. Therefore, the result obtained by adopting the single-mode defect method is different from the result obtained by adopting the integral-mode defect method, and the correctness of mode superposition is verified.
Step 6: performing implosion fluid-solid coupling calculation on the metal pressure shell in the deep sea environment, and verifying the deformation result of the implosion structure of the deep sea metal pressure shell based on modal displacement
And D, carrying out numerical simulation on the implosion failure mechanism of the final finite element model in the fifth step by adopting a fluid-solid coupling algorithm, and verifying the correctness of the annular rib cylindrical shell judging method based on the modal displacement result. The implosion failure process based on single mode and first six superimposed mode displacements is shown in fig. 6.
For the results of the first order buckling mode as a result of initial defect introduction into the structural finite element model, the deep sea annular rib cylindrical shell begins to dent inward at the central location and fails first at the central location. As implosion evolves, the collapse of the central location gradually extends toward both ends, eventually leading to failure of the entire structure. In an implosion failure mechanism of the first 6-order mode displacement superposition, the annular rib cylindrical shell structure presents the deformation characteristic of a multi-order mode at the surface position, and the middle section of the cylindrical shell is basically completely failed and broken along with the development of implosion. It can be seen that the mechanism of underwater implosion failure of the annular rib cylindrical shell is consistent with the single and stacked results based on modal displacement. Therefore, the invention can quickly obtain the implosion failure mechanism of the deep-sea metal pressure-resistant shell based on modal displacement, and has important engineering significance for the design and manufacture of the deep-sea submersible pressure-resistant shell.
Those skilled in the art will appreciate that the systems, apparatus, and their respective modules provided herein may be implemented entirely by logic programming of method steps such that the systems, apparatus, and their respective modules are implemented as logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc., in addition to the systems, apparatus, and their respective modules being implemented as pure computer readable program code. Therefore, the system, the apparatus, and the respective modules thereof provided by the present invention may be regarded as one hardware component, and the modules included therein for implementing various programs may also be regarded as structures within the hardware component; modules for implementing various functions may also be regarded as being either software programs for implementing the methods or structures within hardware components.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (10)
1. A method for judging an implosion failure mechanism of a deep-sea metal pressure-resistant shell based on modal displacement is characterized by comprising the following steps:
step S1: modeling a structural finite element model of the deep sea metal pressure-resistant shell to obtain a finite element model, and numbering nodes of the finite element model;
step S2: performing eigenvalue buckling analysis on the finite element model by adopting a finite element method to obtain a front N-order modal displacement result;
step S3: obtaining initial geometric defects of a local single-mode defect method or a combined-mode defect method based on each-order modal displacement result;
step S4: scaling the initial geometric defects according to the geometric out-of-roundness requirement of the pressure shell to obtain final geometric defect displacement of the deep sea pressure structure;
step S5: modeling finite element models is carried out on the results of different final geometric defect displacements to obtain a final structural finite element model, and the obtained final structural finite element model is utilized to judge the implosion failure mode of the deep sea metal pressure shell;
step S6: and carrying out implosion fluid-solid coupling calculation on the metal pressure shell in the deep sea environment, and judging the implosion failure mode of the deep sea metal pressure shell by verifying and utilizing the final structure finite element model.
2. The method for judging the implosion failure mechanism of the deep sea metal pressure housing based on modal displacement according to claim 1, wherein the step S3 is characterized in that: acquiring a certain-order modal result based on each-order modal displacement result to obtain an initial geometric defect of a single-modal defect method; or based on the modal displacement results of each order, carrying out partial or total superposition to obtain the defect geometrical defect of the combined modal defect method.
3. The method for judging the implosion failure mechanism of the deep sea metal pressure housing based on modal displacement according to claim 1, wherein the step S4 is characterized in that: and scaling the initial geometric defect displacement by taking the geometric out-of-roundness requirement of the pressure shell as a scaling factor to obtain the final geometric defect displacement.
4. The method for judging the implosion failure mechanism of the deep sea metal pressure housing based on modal displacement according to claim 1, wherein the step S5 is characterized in that: node number m corresponding to final node defect displacement i Added to the structure finite element model node number n i Obtaining a final structure finite element model;
wherein, consider the node position of the deep sea metal pressure shell based on modal displacement as follows:
n n,(x,) ＝n i +m i
wherein n is n,(x,) The position corresponding to the unit node number i after the displacement is superimposed based on the previous N-order mode is shown.
5. The method for judging the implosion failure mechanism of the deep sea metal pressure housing based on modal displacement according to claim 1, wherein the step S6 is characterized in that: and carrying out implosion fluid-solid coupling calculation on the metal pressure-resistant shell in the deep sea environment by adopting a fluid-solid coupling algorithm.
6. A system for judging an implosion failure mechanism of a deep-sea metal pressure housing based on modal displacement is characterized by comprising the following components:
module M1: modeling a structural finite element model of the deep sea metal pressure-resistant shell to obtain a finite element model, and numbering nodes of the finite element model;
module M2: performing eigenvalue buckling analysis on the finite element model by adopting a finite element method to obtain a front N-order modal displacement result;
module M3: obtaining initial geometric defects of a local single-mode defect method or a combined-mode defect method based on each-order modal displacement result;
module M4: scaling the initial geometric defects according to the geometric out-of-roundness requirement of the pressure shell to obtain final geometric defect displacement of the deep sea pressure structure;
module M5: modeling finite element models is carried out on the results of different final geometric defect displacements to obtain a final structural finite element model, and the obtained final structural finite element model is utilized to judge the implosion failure mode of the deep sea metal pressure shell;
module M6: and carrying out implosion fluid-solid coupling calculation on the metal pressure shell in the deep sea environment, and judging the implosion failure mode of the deep sea metal pressure shell by verifying and utilizing the final structure finite element model.
7. The system for judging a failure mechanism of implosion of a deep sea metal pressure housing based on modal displacement according to claim 6, wherein the module M3 employs: acquiring a certain-order modal result based on each-order modal displacement result to obtain an initial geometric defect of a single-modal defect method; or based on the modal displacement results of each order, carrying out partial or total superposition to obtain the defect geometrical defect of the combined modal defect method.
8. The system for judging a failure mechanism of implosion of a deep sea metal pressure housing based on modal displacement according to claim 6, wherein the module M4 adopts: and scaling the initial geometric defect displacement by taking the geometric out-of-roundness requirement of the pressure shell as a scaling factor to obtain the final geometric defect displacement.
9. The system for judging a failure mechanism of implosion of a deep sea metal pressure housing based on modal displacement according to claim 6, wherein the module M5 employs: node number m corresponding to final node defect displacement i Added to the structure finite element model node number n i Obtaining a final structure finite element model;
wherein, consider the node position of the deep sea metal pressure shell based on modal displacement as follows:
n n,(x,) ＝n i +m i
wherein n is n,(x,) The position corresponding to the unit node number i after the displacement is superimposed based on the previous N-order mode is shown.
10. The system for judging a failure mechanism of implosion of a deep sea metal pressure housing based on modal displacement according to claim 6, wherein the module M6 employs: and carrying out implosion fluid-solid coupling calculation on the metal pressure-resistant shell in the deep sea environment by adopting a fluid-solid coupling algorithm.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103714206A (en) * | 2013-12-17 | 2014-04-09 | 天津大学 | Subsea pipeline two-dimensional static numerical simulation method for introducing initial defects based on modes |
| CN108614912A (en) * | 2018-03-21 | 2018-10-02 | 江苏科技大学 | A kind of spherical shape pneumatic shell mechanical characteristic analysis computational methods |
| CN111753455A (en) * | 2020-06-30 | 2020-10-09 | 仲恺农业工程学院 | Method for quickly calculating dynamic buckling of slender metal arch structure by considering geometric defects |
| CN112307659A (en) * | 2020-10-30 | 2021-02-02 | 江苏科技大学 | Method for calculating ultimate bearing capacity numerical value of double-layer cylindrical pressure-resistant shell |
| WO2022121200A1 (en) * | 2020-12-08 | 2022-06-16 | 江苏科技大学 | Numerical computation method for spherical pressure hull containing random pitting defect |
-
2023
- 2023-03-30 CN CN202310334495.0A patent/CN116432491A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103714206A (en) * | 2013-12-17 | 2014-04-09 | 天津大学 | Subsea pipeline two-dimensional static numerical simulation method for introducing initial defects based on modes |
| CN108614912A (en) * | 2018-03-21 | 2018-10-02 | 江苏科技大学 | A kind of spherical shape pneumatic shell mechanical characteristic analysis computational methods |
| CN111753455A (en) * | 2020-06-30 | 2020-10-09 | 仲恺农业工程学院 | Method for quickly calculating dynamic buckling of slender metal arch structure by considering geometric defects |
| CN112307659A (en) * | 2020-10-30 | 2021-02-02 | 江苏科技大学 | Method for calculating ultimate bearing capacity numerical value of double-layer cylindrical pressure-resistant shell |
| WO2022121200A1 (en) * | 2020-12-08 | 2022-06-16 | 江苏科技大学 | Numerical computation method for spherical pressure hull containing random pitting defect |
Non-Patent Citations (5)
| Title |
|---|
| 中国船级社: "潜水系统与潜水器入级规范", 1 December 2018, 人民交通出版社, pages: 61 - 62 * |
| 同志学等: "缺陷圆柱壳体外压屈曲的仿真分析", 哈尔滨工业大学学报, vol. 54, no. 7, 31 July 2022 (2022-07-31), pages 64 - 69 * |
| 张建;周通;王纬波;唐文献;: "模态缺陷条件下复合材料柱形壳屈曲特性", 复合材料学报, no. 03, 31 December 2017 (2017-12-31), pages 124 - 132 * |
| 张晓龙等: "氮化硅陶瓷空心浮力球在内爆临界状态下的失效分析", 海洋工程, vol. 38, no. 6, 30 November 2020 (2020-11-30), pages 70 - 76 * |
| 熊志鑫;黄志权;张道兵;胡雄;: "模态缺陷条件下的深潜耐压球壳极限强度", 哈尔滨工程大学学报, no. 01, 31 December 2020 (2020-12-31), pages 80 - 84 * |
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