CN110807224B - Method and system for estimating total vibration of ship-shaped structure by one-dimensional beam system method - Google Patents
Method and system for estimating total vibration of ship-shaped structure by one-dimensional beam system method Download PDFInfo
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Abstract
The invention relates to the technical field of ship and ocean engineering, in particular to a method and a system for estimating the total vibration of a ship-shaped structure by a one-dimensional beam system method, wherein the method comprises the following steps: firstly, determining specific position information of a plurality of segmented hull beams and specific values of hull beam design input at corresponding positions; and then inputting specific numerical values according to the design of the hull beam, obtaining the flow section information and the wet surface information through background automatic flow, writing the flow section information and the wet surface information into corresponding card entries of MSC/NASTRAN, and finally automatically calling the MSC/NASTRAN power calculation module to perform free vibration analysis calculation and outputting a calculation result and a corresponding vibration pattern diagram. The invention can rapidly carry out technical macro control on the scheme and design elements of the project to be developed; the technical cycle of the total vibration design of the ship-shaped structure is greatly reduced, and the design research and development efficiency of the ship-shaped structure design product is effectively improved on the whole.
Description
Technical Field
The invention relates to the technical field of ship and ocean engineering, in particular to a method and a system for estimating total vibration of a ship-shaped structure by using a one-dimensional beam system method.
Background
With the progress of modern technology, the improvement of human life quality and the urgent need of marine environmental ecological protection, the comfort design of ship-shaped structures such as vibration noise and the like is more and more strict; and with the progress of ship and ocean engineering design technology, the innovative ship-shaped structure continuously appears, and the traditional mother ship design technology is restricted, so that the control of the overall vibration of the innovative ship-shaped structure at the initial design stage is fast and effectively a major key point of the current design.
On the other hand, the existing DOS operation system is basically used in the program for calculating the total vibration of the ship-shaped structure by using the existing transfer matrix method, the requirement on the ship body size ratio is harsh, the operation interface is mostly unfriendly, the requirement on the dynamics specialty of a user is high, and the tool is prevented from being effectively utilized by general designers to a great extent; meanwhile, the existing method for estimating the total vibration of the ship-shaped structure by using the three-dimensional finite element method needs to consume a great deal of energy of designers to carry out fussy ship-shaped structure three-dimensional modeling and ship-shaped weight multi-section simulation, the number of ultra-large three-dimensional finite element units causes ultra-large background attached water quality calculation and dynamic calculation, a great deal of post-processing data is formed, and comprehensive factors in all aspects finally cause that the estimation of the three-dimensional finite element method on the total vibration of the ship-shaped structure needs to consume ultra-long working hours, so that the method is far from meeting the requirement of limited engineering design period under the development of modern industry. The main purpose of the general vibration design control of the ship-shaped structure in the initial stage of scheme design is to macroscopically and quickly judge the professional feasibility and control the direction of the project, input information of the design in the initial stage is not perfect, and estimation of some parameters is required by using a traditional experience method or a referee engineering method, so that the general vibration estimation method of the ship-shaped structure under an open, quick, convenient and personalized humanized operation interface is urgently required by engineering design.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method and a system for estimating the total vibration of a ship-shaped structure by using a one-dimensional beam system method.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
s1, determining specific position information of a plurality of segmented hull beams and specific design input numerical values of the hull beams at corresponding positions;
s2, judging whether the section information in the specific numerical value input by the hull beam design is complete, if so, automatically processing the section information by a background and writing the section information into a section beam attribute card entry corresponding to MSC/NASTRAN, and executing the step S7; if the profile information is incomplete, automatically calculating the profile information according to the background automation language simplified and processed by a material mechanics theory, automatically writing the profile information into the profile beam attribute card entry corresponding to MSC/NASTRAN in a flow-by-flow manner, and executing a step S7;
s3, judging whether the wet surface information in the specific numerical value input by the hull beam design accords with the premise of the use of the Liuyi angle change method, and if the wet surface information accords with the premise of the use of the Liuyi angle change method, executing the step S4; if the wet surface information does not conform to the premise of the use of the Liuyi conformal change method, executing the step S5;
s4, obtaining the attached water quality information of the hull beam by a background according to the Liuyi conformal change method, and executing the step S6;
s5, automatically forming the water quality information of the hull beam attachment according to the known or estimated total mass information of the water of the hull beam attachment by inputting specific numerical information by the background according to the design of the hull beam, and executing the step S6;
s6, automatically processing the attaching water quality information of the hull beam, writing the automatically processed attaching water quality information of the hull beam into corresponding horizontal quality and vertical quality card entries of MSC/NASTRAN, and executing the step S7;
and S7, performing free vibration analysis and calculation on the automatically-processed section information and the hull beam attached water quality information, and outputting a calculation result and a corresponding mode shape diagram.
Preferably, the specific position information of the hull beam in step S1 includes: the coordinate direction of the ship length direction of the ship body in the x direction, the coordinate direction of the ship width direction of the ship body in the y direction and the coordinate direction of the ship body type depth direction in the z direction.
Preferably, the ship length is a characteristic value such as a design water line length which is smaller than the total length of the ship body, but is greater than or equal to a structural design ship length.
Preferably, the profile information includes: cross-sectional area, vertical moment of inertia, horizontal moment of inertia, torsional constant, shear stiffness factor, etc.
Preferably, the simple processing of the torsion constant is calculated by using the formula (1):
wherein D is i Is of high cross-sectional dimension, B i Is a cross-sectional dimension of wide, t i Is the average thickness of the section, J i Is a torsional constant.
Preferably, the wet surface information includes: half width at the waterline, water draft at the waterline, half cross-sectional area under the waterline, etc.
Preferably, the ship body beams of the plurality of segments are 20 to 25 segments.
Preferably, the hull beam attached water mass information obtained by the lewis conformal change method changes with the order of the vibration mode, and the output calculation result corresponds to the order of the attached water mass.
Preferably, the background can automatically and repeatedly call the hull beam attached water quality information to perform free vibration calculation on the hull beams with different orders and output calculation results of corresponding orders.
A system for estimating the total vibration of a ship-type structure by a one-dimensional beam system, comprising:
the information input module is used for inputting the specific information of the hull beam;
the information judgment module is connected with the information input module and the automatic flow module and is used for judging the section information and the wet surface information in the specific numerical values input by the hull beam design;
the information processing module is connected with the information judging module and the automatic flow module and is used for calculating and processing the profile information and the wet surface information;
the information storage module is connected with the automatic flow module and used for storing the data after automatic flow;
the power calculation module is connected with the information storage module and is used for carrying out free vibration analysis calculation on the data after automatic flow;
and the information output module is connected with the power calculation module and used for outputting the free vibration analysis calculation result and the corresponding vibration mode diagram.
The beneficial effects are that: the invention can quickly carry out technical macro control on the scheme and design elements of the project to be developed; greatly reduces the technical cycle of the total vibration design of the ship-shaped structure and effectively improves the design research and development efficiency of the ship-shaped structure design product on the whole.
Drawings
FIG. 1 is a step diagram of a method for estimating the total vibration of a ship-type structure by using a one-dimensional beam system method provided by the invention;
2a and 2b are schematic diagrams of design input source data of the cross sections of the discretely distributed ship body beams;
FIG. 3 is a schematic illustration of hull half-section wet surface design input source data;
FIG. 4 is a schematic diagram of the solved 1 st order vertical mode shape;
FIG. 5 is a schematic diagram of the solved 2-order vertical mode shape;
fig. 6 is a structural diagram of a system for estimating total vibration of a ship-type structure by using a one-dimensional beam system method provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Referring to fig. 1-3, a step diagram of a method for estimating total vibration of a ship-shaped structure by using a one-dimensional beam system method and a schematic diagram of design input source data provided by the invention comprise:
s1, determining specific position information of a plurality of segmented hull beams and specific design input numerical values of the hull beams at corresponding positions;
s2, judging whether the section information in the specific numerical value input by the hull beam design is complete, if so, automatically processing the section information by a background and writing the section information into a section beam attribute card entry corresponding to MSC/NASTRAN, and executing the step S7; if the profile information is incomplete, automatically calculating the profile information according to the background automated language simplified and processed by the material mechanics theory, automatically writing the profile information into the profile beam attribute card entries corresponding to MSC/NASTRAN in a flow-by-flow manner, and executing the step S7;
s3, judging whether the wet surface information in the specific numerical value input by the hull beam design accords with the premise of the use of the Liuyi angle change method, and if the wet surface information accords with the premise of the use of the Liuyi angle change method, executing the step S4; if the wet surface information does not accord with the premise of using the Liuyi conformal change method, executing a step S5;
s4, obtaining the attached water quality information of the hull beam by a background according to the Liuyi conformal change method, and executing the step S6;
s5, inputting specific numerical value information by the background according to the design of the hull beam to automatically form the hull beam attached water quality information according to the known or estimated hull beam attached water total quality information, and executing the step S6;
s6, automatically processing the attaching water quality information of the hull beam, writing the automatically processed attaching water quality information of the hull beam into corresponding horizontal quality and vertical quality card entries of MSC/NASTRAN, and executing the step S7;
and S7, performing free vibration analysis and calculation on the automatically-processed section information and the hull beam attached water quality information, and outputting a calculation result and a corresponding mode shape diagram.
Further, the specific position information of the hull beam in step S1 includes: the coordinate direction of the ship length direction of the ship body in the x direction, the coordinate direction of the ship width direction of the ship body in the y direction and the coordinate direction of the ship body type depth direction in the z direction.
Further, the ship length is a characteristic value such as a designed water line length which is smaller than the total length of the ship body, but is larger than or equal to the structural design ship length.
In the preferred embodiment of the invention, the x direction is taken as the coordinate direction of the ship length direction, the origin can be actually determined according to the target engineering, the ship length is a characteristic numerical value such as the designed water line length and the like which is smaller than the total length of the ship body, but is larger than or equal to the structural design ship length L S (ii) a The y direction is the coordinate direction of the width direction of the ship body, and the z direction is the coordinate direction of the depth direction of the ship body, so as to embody the section characteristics of the ship body beam and different directional directivities of the ship body attached water quality and the like; in the present embodiment, n =20 is taken as an example for explanation, it is noted that the number of the segments can be adjusted according to actual needs, and the number of the segments of the hull beam is generally 20-25, subject to the actual design input information of the engineering project.
Further, the profile information includes: cross-sectional area, vertical moment of inertia, horizontal moment of inertia, torsional constant, shear stiffness factor, etc.
Further, the simple processing of the torsion constant adopts the formula (1) to calculate:
wherein D is i A high cross-sectional dimension, B i Is a cross-sectional dimension of wide, t i Average thickness of cross section, J i Is a torsional constant.
Further, the wet surface information includes: half width at the waterline, water draft at the waterline, half cross-sectional area under the waterline, etc.
Furthermore, the ship body beams of the segments are 20-25 segments.
Referring to fig. 4-5, the solved 1-order and 2-order vertical mode shapes are schematically shown, the hull beam attached water mass information obtained by adopting the lewis angle change method changes along with the mode shape orders, and the output calculation result corresponds to the orders of the attached water mass.
Furthermore, the background can automatically and repeatedly call the hull beam attached water quality information to carry out the free vibration calculation of the hull beams with different orders and output the calculation results of the corresponding orders.
And finally, summarizing the free vibration calculation results of each step of the hull beam, and perfecting the total vibration design of the target ship-shaped structure.
Fig. 6 is a structural diagram of a method for estimating total vibration of a ship-type structure by using a one-dimensional beam system method, which is provided by the invention, and comprises the following steps:
the information input module is used for inputting the specific information of the hull beam;
the information judgment module is connected with the information input module and the automatic flow module and is used for judging the section information and the wet surface information in the specific numerical value input by the hull beam design;
the information processing module is connected with the information judging module and the automatic flow module and is used for calculating and processing the profile information and the wet surface information;
the information storage module is connected with the automatic flow module and used for storing the data after automatic flow;
the power calculation module is connected with the information storage module and is used for carrying out free vibration analysis calculation on the data after automatic flow;
and the information output module is connected with the power calculation module and used for outputting the free vibration analysis calculation result and the corresponding vibration mode diagram.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for estimating the total vibration of a ship-type structure by a one-dimensional beam system method, comprising:
s1, determining specific position information of a plurality of segmented hull beams and specific design input numerical values of the hull beams at corresponding positions;
s2, judging whether the section information in the specific numerical value input by the hull beam design is complete, if so, automatically processing the section information by a background and writing the section information into a section beam attribute card entry corresponding to MSC/NASTRAN, and executing the step S7; if the profile information is incomplete, automatically calculating the profile information according to the background automation language simplified and processed by a material mechanics theory, automatically writing the profile information into the profile beam attribute card entry corresponding to MSC/NASTRAN in a flow-by-flow manner, and executing a step S7;
s3, judging whether wet surface information in specific numerical values input by the hull beam design conforms to the premise of the use of the Liuyi conformal change method, and executing the step S4 if the wet surface information conforms to the premise of the use of the Liuyi conformal change method; if the wet surface information does not accord with the premise of using the Liuyi conformal change method, executing a step S5;
s4, obtaining the attached water quality information of the hull beam by a background according to the Liuyi conformal change method, and executing the step S6;
s5, inputting specific numerical value information by the background according to the design of the hull beam to automatically form the hull beam attached water quality information according to the known or estimated hull beam attached water total quality information, and executing the step S6;
s6, automatically processing the attaching water quality information of the hull beam, writing the automatically processed attaching water quality information of the hull beam into corresponding horizontal quality and vertical quality card entries of MSC/NASTRAN, and executing the step S7;
and S7, performing free vibration analysis calculation on the automatically-processed section information and the hull beam attached water quality information, and outputting a calculation result and a corresponding mode shape diagram.
2. The method for estimating the total vibration of the ship-shaped structure by using the one-dimensional beam system method according to claim 1, wherein the specific position information of the ship body beam in the step S1 comprises: the x-direction hull length direction coordinate direction, the y-direction hull width direction coordinate direction, and the z-direction hull form depth direction coordinate direction.
3. The method of claim 2, wherein the length of the ship is a characteristic value such as a design water line length which is smaller than the total length of the ship body but equal to or larger than a structural design length.
4. The method of estimating total vibration of a ship-type structure according to one-dimensional beam system method of claim 1, wherein the profile information includes: cross-sectional area, vertical moment of inertia, horizontal moment of inertia, torsional constant, shear stiffness factor, etc.
5. The method for estimating the total vibration of the ship-type structure by the one-dimensional beam system method according to claim 4, wherein the simple processing of the torsional constant is calculated by the formula (1):
wherein D is i A high cross-sectional dimension, B i Is a cross-sectional dimension of wide, t i Average thickness of cross section, J i Is a torsional constant.
6. The method of estimating total vessel structure vibration according to one-dimensional beam system method of claim 1, wherein the wet surface information includes: half width at the waterline, water draft at the waterline, half cross-sectional area under the waterline, etc.
7. The method of estimating total vibration of a ship-type structure according to the one-dimensional beam system of claim 1, wherein the hull beam of the plurality of segments is 20 to 25 segments.
8. The method for estimating the total vibration of the ship-type structure by the one-dimensional beam system method according to claim 1, wherein the attached water mass information of the ship body beam obtained by the Liuyi conformal change method is changed along with the order of the vibration mode, and the output calculation result corresponds to the order of the attached water mass.
9. The method for estimating the total vibration of the ship-type structure by using the one-dimensional beam system method according to claim 1, wherein the background automatically and repeatedly calls the ship-body beam attached water quality information to calculate the free vibration of the ship-body beam in different orders and outputs the calculation result in the corresponding order.
10. A system for estimating total vibration of a ship structure by using a one-dimensional beam system, according to claims 1 to 9, comprising:
the information input module is used for inputting the specific information of the hull beam;
the information judgment module is connected with the information input module and the automatic flow module and is used for judging the section information and the wet surface information in the specific numerical values input by the hull beam design;
the information processing module is connected with the information judging module and the automatic flow module and is used for calculating and processing the profile information and the wet surface information;
the information storage module is connected with the automatic flow module and used for storing the data after automatic flow;
the power calculation module is connected with the information storage module and is used for carrying out free vibration analysis calculation on the data after automatic process;
and the information output module is connected with the power calculation module and used for outputting the free vibration analysis calculation result and the corresponding vibration mode diagram.
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| CN107187544A (en) * | 2017-04-24 | 2017-09-22 | 中国舰船研究设计中心 | A kind of automatic creation system of hull cross section structure |
| CN107808046A (en) * | 2017-10-25 | 2018-03-16 | 中国船舶工业集团公司第七0八研究所 | A kind of hull beam blast impulse dynamical bending moment determines method |
| CN110197003B (en) * | 2019-05-05 | 2023-05-16 | 中国船舶工业集团公司第七0八研究所 | Multi-section bottom-sitting ship type structure overall load calculation method |
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