CN110795816B - Yacht molded line optimization method based on resistance performance - Google Patents
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Abstract
The invention discloses a yacht molded line optimization method based on resistance performance, which specifically comprises the following steps: the method comprises the steps of S1, developing a cross entropy optimization algorithm through mathematical operation, S2, selecting yacht molded lines of a laboratory to conduct three-dimensional modeling, S3, forecasting resistance performance of each group of ship type schemes, S4, carrying out transformation and resistance performance forecasting on the ship body local molded lines by adopting a full parameterization method, S5, manufacturing the obtained yacht ideal molded lines into objects, and concluding that the invention relates to the technical field of yacht design. The yacht molded line optimization method based on the resistance performance can realize the resistance performance optimization of the yacht by adopting an advanced ship model simulation optimization technology based on CAD/CFD, a series of yacht type schemes are generated by establishing a full parameterization three-dimensional model of the yacht and adopting an improved random optimization algorithm, the resistance performance calculation is carried out on each scheme, the global optimal solution is searched, and the resistance performance of the optimal yacht type scheme is expected to be improved by more than 10%.
Description
Technical Field
The invention relates to the technical field of yacht design, in particular to a yacht molded line optimization method based on resistance performance.
Background
The yacht is a high-grade durable consumer product for water entertainment, integrates functions of navigation, sports, entertainment, recreation, leisure and the like, meets the living needs of individuals and families, is mainly private in developed countries like a sedan, is used as an operation project of parks and tourist attractions for people to consume in developing countries, is used as a working means of harbor supervision, public security and frontier in small quantity, is an essential feature of an entertainment tool, is different from a high-speed ship and a tourist ship serving as transport means, and becomes the next-generation durable consumer product entering the family like an automobile.
Aiming at the current situation that the design level of the yacht in China is relatively lagged, the invention provides that the advanced ship type simulation optimization technology based on CAD/CFD is adopted to optimize the resistance performance of the yacht, a series of yacht type schemes are generated by establishing a whole parameterized three-dimensional model of the yacht and adopting an improved random optimization algorithm, resistance performance calculation is carried out on each scheme, a global optimal solution is searched, the resistance performance of the optimal yacht type scheme is expected to be improved by more than 10%, the research initially can be met, theoretical basis is provided for guiding the scientific and efficient design of the high-performance yacht, the research result is helpful for improving the autonomous design level of the yacht in China, the yacht with better resistance performance is developed, the design level of the yacht can be driven to be improved, and the industrial upscale is promoted.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a yacht molded line optimization method based on resistance performance, which is characterized in that a series of yacht type schemes are generated by establishing a matrix type yacht full-parameterized three-dimensional model and adopting an improved random optimization algorithm, resistance performance calculation is carried out on each scheme, and a global optimal solution is searched.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme: a yacht molded line optimization method based on resistance performance specifically comprises the following steps:
s1, developing a cross entropy optimization algorithm through mathematical operation, and integrating ship-type transformation and resistance performance calculation modules;
s2, selecting a yacht molded line of a laboratory to perform three-dimensional modeling, and performing global transformation on the ship by adopting affine transformation and Lackenby transformation methods;
s3, forecasting the resistance performance of each ship type scheme, and optimizing to obtain the yacht molded line with the optimal resistance performance;
s4, transforming the local molded lines of the ship body and forecasting the resistance performance by adopting a full parameterization method until algorithm rules are met;
s5, manufacturing the obtained ideal profile of the yacht into a real object, and verifying the resistance reduction effect by using two methods of numerical simulation and still water test to obtain a conclusion.
Preferably, the resistance performance calculation module in step S1 includes a potential flow calculation module and a viscous flow module, where the potential flow calculation module is used to calculate wave making resistance of the yacht, the boundary condition is a nonlinear free liquid level, the numerical dispersion adopts a high-quality bin grid, and the hull surface is not penetrable.
Preferably, the viscous flow module is used for calculating viscous pressure resistance and friction resistance of the yacht, the inflow surface is set as an inflow boundary condition, the outflow surface is set as an outflow boundary condition, the outer boundary and the symmetrical surface are both set as sliding boundary conditions, the ship surface adopts a non-sliding boundary condition, the turbulence model is a k-omega SST model, and the dispersion of the calculation domain of the stern part adopts a fully structured hexahedral grid.
Preferably, the full-parameterized transformation method in step S4 specifically includes the following steps:
t1, firstly, analyzing geometric characteristics of a mother yacht molded line, and determining global characteristic parameters and local characteristic parameters;
t2, generating a ship-shaped characteristic curve by adopting an F spline according to the known information and the characteristic parameters;
a macro command is rewritten to describe the characteristic transverse cross section, and a series of ship transverse cross section lines are generated by using a curve generator on the basis;
and T4, finally, generating the fairing hull curved surface which can be described by limited parameters by a curved surface generator through a meta curved surface generation method.
Preferably, in the step S3, the model line fitting precision and the resistance performance calculation precision of the mother boat need to be verified in the optimization process, and in addition, the global convergence of the cross entropy method needs to be researched through a numerical test function.
Preferably, the ship profile optimizing frame comprises four basic modules, namely a ship type design module, a ship type analysis module, a ship type evaluation module and a ship type conversion module.
Preferably, the ship model design module adopts CAD ship model parameterization modification technology to modify the mother model, generate smooth ship body curved surface, and obtain ship model geometric description identifiable by CFD software.
Preferably, the ship type analysis module performs numerical simulation of CFD on the ship type to obtain flow field information such as pressure distribution, local flow and the like on the surface.
Preferably, the ship model evaluation module evaluates hydrodynamic performance such as resistance and the like of the ship model according to flow field information simulated by CFD values.
Preferably, the ship type transformation module can analyze and compare the influence of different ship type design parameters and combinations of different design parameters on hydrodynamic performance, and properly adjust the design parameters by adopting a reasonable optimization algorithm.
(III) beneficial effects
The invention provides a yacht molded line optimization method based on resistance performance. Compared with the prior art, the method has the following beneficial effects:
(1) The yacht molded line optimization method based on the resistance performance specifically comprises the following steps: the method comprises the steps of S1, developing a cross entropy optimization algorithm through mathematical operation, integrating ship type transformation and resistance performance calculation modules, S2, selecting a yacht molded line of a laboratory to conduct three-dimensional modeling, conducting global transformation on the ship types through affine transformation and Lackenby transformation, S3, conducting resistance performance prediction on each group of ship type schemes, optimizing to obtain the optimal resistance performance yacht molded line, S4, conducting transformation and resistance performance prediction on the ship body local molded line through a full parameterization method until algorithm rules are met, S5, manufacturing the obtained yacht ideal molded line into a physical object, verifying resistance reduction effects through numerical simulation and hydrostatic testing to obtain conclusion, generating a series of yacht type schemes through an advanced ship type simulation optimization technology based on CAD/CFD, conducting resistance performance optimization on the yacht by means of establishing an improved random optimization algorithm, conducting resistance performance calculation on each scheme, searching for the global optimal solution, and conducting resistance performance improvement on the optimal yacht type schemes by more than 10%, and meeting research purposes, guiding high-performance design, improving the design performance of the yacht to be better than the design results and promoting the design of the yacht on the yacht at the level of China, and promoting the development of the yacht to be better than the level.
(2) According to the yacht molded line optimization method based on the resistance performance, the hydrostatic computation is carried out on the constructed yacht three-dimensional model, whether the difference among the drainage amount, the longitudinal position of the floating center and the wet surface area and the mother yacht is controlled within 1% is mainly concerned, meanwhile, the resistance performance is forecast on a yacht scheme, the forecast result is compared with test data, and the forecast error is controlled within 3%.
(3) According to the yacht molded line optimization method based on the resistance performance, the global convergence of the cross entropy method developed in the project is tested through a common numerical test function, so that the number of required function evaluations is reduced as much as possible when the global optimal solution is searched, yacht molded line optimization is completed within an acceptable time range, and meanwhile, the total resistance coefficient of the yacht is reduced by more than 5% through the project research on the basis of ensuring arrangement and attractive influence on the target yacht.
Drawings
FIG. 1 is a technical roadmap of the invention;
FIG. 2 is a CAD/CFD-based hull form optimization framework diagram of the present invention;
FIG. 3 is a schematic diagram of the parameterized modeling mechanism of the present invention;
fig. 4 is a flowchart of an iteration of the CE algorithm of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-4, the embodiment of the present invention provides a technical solution: a yacht molded line optimization method based on resistance performance specifically comprises the following steps:
s1, developing a cross entropy optimization algorithm through mathematical operation, integrating ship-type transformation and resistance performance calculation modules, wherein the resistance performance calculation modules comprise potential flow calculation modules and viscous flow modules, the potential flow calculation modules are used for calculating wave making resistance of the yacht, boundary conditions are nonlinear free liquid surfaces, high-quality surface element grids are adopted for numerical value dispersion, moreover, the surface of the yacht is impenetrable, the viscous flow modules are used for calculating viscous pressure resistance and friction resistance of the yacht, inflow surfaces are set as inflow boundary conditions, outflow surfaces are set as outflow boundary conditions, outer boundaries and symmetrical surfaces are set as slip boundary conditions, ship surfaces are non-slip boundary conditions, turbulence models are k-omega SST models, and full-structure hexahedral grids are adopted for dispersion of calculation domains of stern parts;
s2, selecting a yacht molded line of a laboratory to perform three-dimensional modeling, and performing global transformation on the ship by adopting affine transformation and Lackenby transformation methods;
s3, forecasting the resistance performance of each ship type scheme, optimizing to obtain a yacht molded line with optimal resistance performance, verifying the fitting precision of the mother ship molded line and the calculation precision of the resistance performance in the optimization process, and researching the global convergence of a cross entropy method through a numerical test function;
s4, transforming the local molded lines of the ship body and forecasting the resistance performance by adopting a full parameterization method until algorithm rules are met, wherein the full parameterization transformation method specifically comprises the following steps of:
t1, firstly, analyzing geometric characteristics of a mother yacht molded line, and determining global characteristic parameters and local characteristic parameters;
t2, generating a ship-shaped characteristic curve by adopting an F spline according to the known information and the characteristic parameters;
a macro command is rewritten to describe the characteristic transverse cross section, and a series of ship transverse cross section lines are generated by using a curve generator on the basis;
t4, generating a fairing hull curved surface which can be described by limited parameters by a curved surface generator through a meta curved surface generation method;
s5, manufacturing the obtained ideal profile of the yacht into a real object, and verifying the resistance reduction effect by using two methods of numerical simulation and still water test to obtain a conclusion.
The ship profile optimizing frame comprises four basic modules, namely a ship type design module, a ship type analysis module, a ship type evaluation module and a ship type conversion module, wherein the ship type design module adopts CAD ship type parameterization modification technology to modify a parent type to generate a smooth ship surface and obtain ship type geometric description which can be identified by CFD software, the ship type analysis module carries out numerical simulation on the ship type to obtain flow field information such as pressure distribution, local flow and the like of the surface, the ship type evaluation module carries out hydrodynamic performance evaluation such as resistance and the like on the ship type according to the flow field information of CFD numerical simulation, and the ship type conversion module can analyze and compare the influence of combinations of different ship type design parameters and different design parameters on the hydrodynamic performance and adopts reasonable optimization algorithm to properly adjust the design parameters.
The technical indexes are as follows:
1. hydrostatic data of three-dimensional model: the hydrostatic calculation is performed on the constructed three-dimensional model of the yacht, and mainly whether the displacement, the longitudinal position of the floating center and the difference between the wet surface area and the mother yacht are controlled within 1 percent is concerned.
2. Verification of yacht resistance performance calculation accuracy: and forecasting the resistance performance of the yacht scheme, comparing the forecasting result with test data, and controlling the forecasting error within 3%.
3. Global convergence testing of the optimization algorithm: the global convergence of the cross entropy method developed in the project is tested through a common numerical test function, so that the required function evaluation number is as small as possible when the global optimal solution is searched, and the yacht molded line optimization can be completed within an acceptable time range.
4. Evaluation of optimization quality: for the target yacht, on the basis of ensuring arrangement and small aesthetic influence, the total resistance coefficient of the yacht is reduced by more than 5% through the project study.
To sum up
The invention can realize the resistance performance optimization of the mother boat by adopting an advanced CAD/CFD-based ship type simulation optimization technology, generates a series of ship type schemes by adopting an improved random optimization algorithm, carries out resistance performance calculation on each scheme, searches for a global optimal solution, expects that the resistance performance of the optimal ship type scheme is improved by more than 10 percent, can meet the initial aim of research, provides theoretical basis for guiding the scientific and efficient design of the high-performance yacht, is helpful for improving the autonomous design level of the yacht in China, develops the yacht with better resistance performance, can drive the improvement of the design level of the yacht, promotes the industrial grade upgrading, mainly focuses on whether the difference between the drainage amount, the longitudinal position of the yacht and the wet surface area and the mother boat is controlled within 1 percent or not by carrying out hydrostatic calculation on the constructed yacht three-dimensional model, meanwhile, the resistance performance of the yacht scheme is forecast, the forecast result is compared with test data, the forecast error is controlled within 3%, the cross entropy method global convergence developed by the engineering is tested through a common numerical test function, the required function evaluation number is as small as possible when the overall optimal solution is searched, so that yacht molded line optimization is completed within an acceptable time range, meanwhile, the yacht total resistance coefficient is reduced by more than 5% through the engineering research on the basis of ensuring arrangement and attractive effect of a target yacht, a CAD model parametric modification technology is adopted to modify a mother model, a smooth hull curved surface is generated, the geometric description of the ship model which can be identified by CFD software is obtained, the numerical simulation of the CFD is carried out on the ship model, and the pressure distribution of the surface is obtained, and (3) carrying out hydrodynamic performance assessment such as resistance on the ship model according to the flow field information of the CFD numerical simulation, analyzing and comparing the influence of different ship model design parameters and combinations of different design parameters on the hydrodynamic performance, and adopting a reasonable optimization algorithm to properly adjust the design parameters.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A yacht molded line optimization method based on resistance performance is characterized by comprising the following steps: the method specifically comprises the following steps:
s1, developing a cross entropy optimization algorithm through mathematical operation, and integrating ship-type transformation and resistance performance calculation modules;
s2, selecting a yacht molded line of a laboratory to perform three-dimensional modeling, and performing global transformation on the ship by adopting affine transformation and Lackenby transformation methods;
s3, forecasting the resistance performance of each ship type scheme, optimizing to obtain a yacht molded line with optimal resistance performance, verifying the fitting precision of the mother ship molded line and the calculation precision of the resistance performance, and researching the global convergence of a cross entropy method through a numerical test function;
s4, transforming the local molded lines of the ship body and forecasting the resistance performance by adopting a full parameterization method until algorithm rules are met;
s5, manufacturing the obtained ideal profile of the yacht into a real object, and verifying the resistance reduction effect by using two methods of numerical simulation and still water test to obtain a conclusion;
s6, the ship profile optimizing frame comprises four basic modules, namely a ship type design module, a ship type analysis module, a ship type evaluation module and a ship type conversion module;
s7, analyzing geometric characteristics of the mother yacht molded lines to determine global characteristic parameters and local characteristic parameters;
s8, generating a ship-shaped characteristic curve by adopting an F spline according to the known information and the characteristic parameters;
s9, writing a macro command to describe the characteristic transverse cross section line, and generating a series of ship transverse cross section lines by using a curve generator on the basis;
s10, generating a fairing hull curved surface capable of being described by limited parameters by a curved surface generator through a meta curved surface generation method;
and S11, modifying the mother model by adopting a CAD (computer aided design) ship model parameterization modification technology to generate a smooth ship body curved surface, and obtaining the ship model geometric description identifiable by CFD (computational fluid dynamics) software.
2. The yacht profile optimization method based on resistance performance as claimed in claim 1, wherein: the resistance performance calculation module in the step S1 comprises a potential flow calculation module and a viscous flow module, the potential flow calculation module is used for calculating wave making resistance of the yacht, the boundary condition is a nonlinear free liquid level, the numerical value is discrete by adopting a high-quality surface element grid, and the surface of the yacht body is not penetrable.
3. The yacht profile optimization method based on resistance performance as claimed in claim 2, wherein: the viscous flow module is used for calculating viscous pressure resistance and friction resistance of the yacht, the inflow surface is set to be an inflow boundary condition, the outflow surface is set to be an outflow boundary condition, the outer boundary and the symmetrical surface are both set to be slip boundary conditions, the ship surface adopts a slip-free boundary condition, the turbulence model is a k-omega SST model, and the dispersion of the calculation domain of the stern part adopts a fully structured hexahedral grid.
4. The yacht profile optimization method based on resistance performance as claimed in claim 1, wherein: and the ship type analysis module performs CFD numerical simulation on the ship type to obtain the pressure distribution and the local flow field information of the surface.
5. The yacht profile optimization method based on resistance performance as claimed in claim 4, wherein: and the ship type evaluation module evaluates the resistance hydrodynamic performance of the ship type according to the flow field information simulated by the CFD numerical value.
6. The yacht profile optimization method based on resistance performance as claimed in claim 4, wherein: the ship type transformation module can analyze and compare the influence of different ship type design parameters and combinations of different design parameters on hydrodynamic performance, and properly adjust the design parameters by adopting a reasonable optimization algorithm.
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| CN111619755B (en) * | 2020-06-09 | 2021-05-04 | 中国船舶科学研究中心 | Hull profile design method based on convolutional neural network |
| CN111723535B (en) * | 2020-06-12 | 2023-03-10 | 电子科技大学 | Yacht drag reduction optimization method based on hull free deformation |
| CN115481494B (en) * | 2022-10-17 | 2023-08-15 | 武汉理工大学 | Method for generating model line pedigree of Yangtze river all-line passenger ship |
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