LU100972B1 - Design method for optimizing comprehensive performance of pentamaran - Google Patents
Design method for optimizing comprehensive performance of pentamaran Download PDFInfo
- Publication number
- LU100972B1 LU100972B1 LU100972A LU100972A LU100972B1 LU 100972 B1 LU100972 B1 LU 100972B1 LU 100972 A LU100972 A LU 100972A LU 100972 A LU100972 A LU 100972A LU 100972 B1 LU100972 B1 LU 100972B1
- Authority
- LU
- Luxembourg
- Prior art keywords
- pentamaran
- model
- slant
- side hull
- hull
- Prior art date
Links
Classifications
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The present invention discloses a design method for optimizing comprehensive performance of a pentamaran, in which a simulation experiment and a physical model experiment are carried out on a mathematical model of a pentamaran model, an optimized scheme of the pentamaran structure is provided, and the optimized scheme is comprehensively verified. The technical solution is: building a pentamaran model according to structural design parameters of the pentamaran; establishing a mathematical model for the pentamaran model and performing hydrodynamic performance analysis; according to experimental conditions, designing a physical model, and modifying the mathematical model after preliminary calculation of the parameters; configuring a side hull of the pentamaran as a slant-side hull with a small angle of attack to optimize the layout of the slant-side hull; comparing pentamaran bow shapes to analyze the resistance performance of different bow shapes; and determining an optimized pentamaran model and performing experimental analysis on the stability and motion characteristics of the optimized pentamaran model.
Description
DESIGN METHOD FOR OPTIMIZING COMPREHENSIVE PERFORMANCE OF PENTAMARAN
Field of the Invention
The present invention relates to the field of pentamaran optimization technology, in particular to a design method for optimizing comprehensive performance of a pentamaran.
Background of the Invention A yacht is a kind of consumer goods integrating multiple functions of navigation, sports, entertainment, leisure and the like. In developed countries, yachts are widely used like cars, but more entertaining, leisurely and even luxury than cars. In developing countries, many yachts are used in business operations of parks and tourist attractions for people to enjoy. A small number of yachts are used as working boats for maritime affairs, public security, and border defense. In the 1990s, yachts officially entered the Chinese market. After years of development, the mainland yacht industry has made some development in the fields of design, manufacturing and supporting services, etc. At present, yacht design is developing towards the trends of multi-functionality, comfort, fashion and the like.
The implementation of China's maritime power strategy requires the support of advanced shipbuilding industry. One of the important things of the rapid transformation and upgrading of the shipbuilding industry is developing more economical and greener multi-hull types of commercial cargo ships. As a typical multihull, a pentamaran has a wider plate and higher damaged stability and low-speed seaworthiness in bad sea conditions compared with other multihulls such as a catamaran and trimaran, and has the potential to develop into a new type of commercial cargo ship that meets the development trend of the ocean economy. Top ship research and development institutions such as the University of London in UK, MARINTEK in Norway, California State University in USA, IZAR in Spain, and Lockheed Martin have invested a lot of manpower and financial resources to research pentamaran cargo ships, and endeavor to further improve the rapidity and seaworthiness of the ship type in bad sea conditions. Niger Company initially tried to develop and build an "ADX Express" high-speed five-hull container ship, and have initially achieved lower-cost and safer cargo transportation by relying on the pentamaran type, and quickly seized the strategic commanding height of the international shipping business market. Royal Navy and Niger Company are trying to use it for military transportation, and have pioneered the concept of pentamaran-based aircraft carrier and supply ship.
How to further improve the rapidity and seaworthiness of pentamarans in bad sea conditions is also one of the main research subjects in the development of commercial cargo ships in China. At present, there is still no effective solution to the optimization of the navigation characteristics of the pentamarans.
Summary of the Invention
To overcome the shortcomings in the prior art, the present invention provides a design method for optimizing comprehensive performance of a pentamaran, in which a simulation experiment and a physical model experiment are carried out on a mathematical model of a pentamaran model, an optimized scheme of the pentamaran structure is provided, and the optimized scheme is comprehensively verified.
Further, the present invention adopts the following technical solution: A design method for optimizing comprehensive performance of a pentamaran includes the following steps: step 1 : building a pentamaran model according to structural design parameters of the pentamaran; step 2: establishing a mathematical model for the pentamaran model and performing hydrodynamic performance analysis; step 3: according to experimental conditions, designing a physical model, and modifying the mathematical model after preliminary calculation of the parameters; step 4: configuring a side hull of the pentamaran as a slant-side hull with a small angle of attack to optimize the layout of the slant-side hull; step 5: comparing pentamaran bow shapes to analyze the resistance performance of different bow shapes; and step 6: determining an optimized pentamaran model and performing experimental analysis on the stability and motion characteristics of the optimized pentamaran model.
Further, step 2 includes specifically: according to the pentamaran model of step 1, establishing a mathematical model of the pentamaran by numerical simulation, and further performing preliminary analysis of hydrodynamic performance of wave resistance and stability.
Further, step 3 includes specifically: according to experimental conditions and the loading requirements, designing a physical model, and preliminarily determining basic parameters of the physical model; according to the differences of field experiment results between the mathematical model and the physical model, modifying the parameters of the mathematical model. Further, step 4 includes specifically: 4.1: configuring a side hull of the pentamaran as a slant-side hull with a small angle of attack, and determining a slant-side hull inclination angle determining model; 4.2: performing numerical simulation experiments on the mathematical model, and performing polynomial fitting to obtain a slant-side hull layout optimization model; and 4.3 performing an experiment on the physical model, and correcting the slant-side hull layout optimization model according to experimental results.
Further, step 4.1 includes specifically: configuring a side hull at a transverse or longitudinal position of the pentamaran as a slant-side hull with a small angle of attack, changing the inclination angle of the slant-side hull, analyzing the influence of different inclination angles of the slant-side hull on the hull resistance characteristics of the pentamaran, building a slant-side hull inclination angle determining model of the pentamaran, and deriving a relationship graph of the resistance and the inclination angle of the slant-side hull.
Further, step 4.2 includes specifically: changing the distance between the slant-side hulls and the distance between the slant-side hulls and the main hull, determining various slant-side hull arrangement schemes, simulating the resistance of the pentamaran in different arrangement schemes respectively, determining the wave interference between the main hull and the slant-side hulls in different arrangement schemes, deriving a contour map of the relationship between the resistance and the position of the slant-side hulls, and performing polynomial fitting according to the obtained simulation data to obtain a slant-side hull layout optimization model.
Further, step 4.3 includes specifically: under the action of a set speed and wave load, calculating the resistance of the physical model of the pentamaran in different slant-side hull arrangement schemes respectively, obtaining the influence of the position change of the slant-side hull on the motion response of the pentamaran, correcting the slant-side hull layout optimization model of step 4.2, and building a slant-side hull layout multi-object optimization model with the arrived conclusions as different constraint conditions and with the highest dynamic stability of the pentamaran as the objective .
Further, step 5 includes specifically: 5.1: determining various bow shapes of the pentamaran; 5.2: carrying out numerical simulation experiments on the resistance performance of the pentamarans with different bow shapes, to obtain a contour map of the relationship between the resistance and the bow shape; and 5.3 carrying out physical model experiments on the resistance performance of the pentamarans with different bow shapes respectively, and correcting the contour map of step 5.2.
Further, step 5.3 includes specifically: under the action of a set the speed and hydrostatic load, measuring the resistance of the pentamarans with different bow shapes in the still water respectively; under the action of a set speed and different wave loads, measuring the resistance of the pentamarans with different bow shapes under counterflow wave loads respectively; and correcting the contour map of step 5.2 based on the resistance obtained.
Further, step 6 includes specifically: 6.1: determining an optimized pentamaran model with the optimal slant-side hull layout, carrying out a numerical simulation experiment, and analyzing the stability of the pentamaran model; 6.2: performing a physical model experiment on the pentamaran model to obtain the course stability and roll characteristic of the pentamaran model; and 6.3: based on steps 6.1 and 6.2, obtaining a vector variance curve diagram of time history curves of the motion of the pentamaran model under different wave loads. Further, step 6.1 includes specifically: determining an optimized pentamaran model with the optimal slant-side hull layout, carrying out a numerical simulation experiment, and analyzing the stability when the hull is intact and when the hull is damaged to obtain a static stability curve and a dynamic stability curve; and under different wave loads, determining the vertical, longitudinal and roll motion responses of the pentamaran model.
Further, obtaining the course stability in step 6.2 includes specifically: arranging a propeller, an acceleration sensor and an angular acceleration sensor for the pentamaran model, carrying out a propeller experiment and an inverse propeller experiment, obtaining the displacements and rotation angles of the two experiments according to acceleration data and angular acceleration data of the two experiments, and then plotting the track and determining the course stability of the pentamaran.
Further, obtaining the course stability in step 6.2 includes specifically: applying a tilting moment to the pentamaran model to tilt it, removing the moment so that the pentamaran model enters a free-sway state, and recording the inclination angle of the pentamaran model in the process; and when the roll amplitude of the pentamaran model is less than a set value, stopping the experiment, calculating a roll period according to the obtained inclination data, and determining its roll characteristic.
Compared with the prior art, the present invention has the following beneficial effects:
In the method of the present invention, the mathematical model and the physical model are provided for the pentamaran model respectively, the numerical simulation experiment is carried out on the mathematical model, and the physical model experiment is carried out on the physical model, so that an optimal slant-side hull layout scheme and bow shape scheme can be obtained, and then an optimized scheme of the pentamaran is obtained.
In the method of the present invention, numerical simulation and physical model experiments are carried out on the optimized scheme of the pentamaran, so that the stability and motion characteristics of the optimized pentamaran model can be obtained, and the performance of the optimized scheme is comprehensively verified by using a method combining multi-working-condition experimental means with numerical simulation means, to determine the performance optimization of the optimized scheme. The present invention is a pioneer in introducing the slant-side hull with the small angle of attack into the ship design of the pentamaran, and improves the stability, seakeeping ability and seaworthiness of the pentamaran.
Brief Description of the Drawings
The drawings as part of the present application are used for providing further understanding of the present invention, and the illustrative embodiments of the present application and the description thereof are intended to explain the present application, rather than improperly limiting the present application.
Fig. 1 is a flow diagram of a method of the present invention;
Fig. 2 is a structure diagram of a pentamaran; in the drawings, a represents the distance between the center of a front slant-side hull and the center of a main hull, b represents the distance between the front slant-side hull and the main hull, c represents the distance between the center of a rear slant-side hull and the center of the main hull, and d represents the distance between the rear slant-side hull and the main hull.
Detailed Description of the Embodiments
It should be noted that the following detailed description is exemplary, and intended to provide further description of the present application. All technical and scientific terms used herein have the same meanings as commonly understood by those of ordinary skill in the art to which the present application pertains, unless otherwise indicated.
It needs to be noted that the terms used herein are only for the purpose of describing particular embodiments, and not intended to limit the exemplary embodiments according to the present application. As used herein, singular forms are also intended to include plural forms unless the context clearly indicates otherwise. In addition, it should also be understood that when the terms "include" and/or "comprise" are used in the specification, they indicate the presence of features, steps, operations, devices, components, and/or combinations thereof.
As described in the background art, the prior art has the shortcoming that the navigation characteristics of the pentamaran cannot be effectively improved. To solve the above technical problem, the present application proposes a design method for optimizing comprehensive performance of a pentamaran. Based on successful research and development experience on monohulls and trimarans, a slant-side hull with a small angle of attack and a new type of bow are respectively introduced into the design of the pentamaran, to finally provide a commercial cargo pentamaran which has a smaller resistance, faster speed and higher seakeeping ability and seaworthiness in bad sea conditions. This is an optimized scheme for the pentamaran, intended to provide the optimal slant-side hull layout and bow type.
In a typical embodiment of the present application, as shown in Fig. 1, a design method for optimizing comprehensive performance of a pentamaran is provided, in which numerical simulation and model experiment research is carried out on the pentamaran: 1) Numerical and experimental measurement research on the inclination angle of a slant-side hull and the arrangement of the slant-side hull in regular waves and the irregular waves is carried out in different sea conditions to analyze and compare the performance characteristics thereof; 2) Research on the resistance characteristics of pentamarans with different bows is carried out; 3) Based on 1) and 2), research on the stability, wave load and motion characteristics of the novel penamaran is carried out. Finally, the rapidity and seaworthiness of the novel penamaran is assessed comprehensively.
The research route of the design method for optimizing comprehensive performance of the pentamaran in the present invention is as follows: 1) Firstly, by reading the literature and carrying out investigation and survey, based on full analysis of data, a commercial cargo pentamaran with a higher speed and seaworthiness is selected as the research object. 2) According to the current research status of pentamarans in China and abroad, with reference to the current research methods of common hulls and multihulls, structural design parameters of the pentamaran are determined, and a pentamaran model is built. 3) A mathematical model of the pentamaran is established using software Maxsurf and AQWA, and preliminary hydrodynamic performance analysis of wave resistance, stability and the like is carried out. 4) According to experimental conditions, a physical model is designed, and preliminary basic parameter calculation is carried out. 5) The mathematical model is modified based on calculation and experimental results. 6) The slant-side hull with a small angle of attack is introduced into the pentamaran design. 7) The layout of the slant-side hull is optimized, and a model of the slant-side hull layout of the pentamaran at a high speed is built. 8) Comparative analysis on the rapidity is carried out using pentamarans with different bow shapes to determine the characteristics of different bows. 9) Based on the above research, the motion performance of the optimized pentamaran model in regular waves and irregular waves is investigated, and a contour map and a flow field analysis map are constructed. 10) Based on the models developed above, a complete set of design ideas applied to engineering practice is provided for the model design and development of the pentamaran, and corresponding design analysis software is developed based on the research results.
Based on the above research route, specific implementing steps of the design method for optimizing comprehensive performance of the pentamaran in the present invention are as follows: step 1 : building a pentamaran model according to structural design parameters of the pentamaran; step 2: establishing a mathematical model for the pentamaran model and performing hydrodynamic performance analysis; step 3: according to experimental conditions, designing a physical model, and modifying the mathematical model after preliminary calculation of the parameters; step 4: configuring a side hull of the pentamaran as a slant-side hull with a small angle of attack to optimize the layout of the slant-side hull; step 5: comparing pentamaran bow shapes to analyze the resistance performance of different bow shapes; and step 6: determining an optimized pentamaran model and performing experimental analysis on the stability and motion characteristics of the optimized pentamaran model. step 2 includes specifically: according to the pentamaran model of step 1, establishing a mathematical model of the pentamaran by numerical simulation, and further performing preliminary analysis of hydrodynamic performance of wave resistance and stability, step 3 includes specifically:
According to experimental conditions and the loading requirements, designing a physical model, and preliminarily determining basic parameters of the physical model (preliminarily determining the main dimensions of the pentamaran (length and width, etc.), initial stability, seakeeping ability and structural strength); according to the differences of field experiment results between the mathematical model and the physical model, modifying the parameters of the mathematical model.
In the specific implementation process, the physical model can be designed according to the wave spectrum of Bohai Bay and common carrying requirements of small and medium-sized unmanned boats; field experiments can be carried out in the Yinhai Yacht Harbor. When the navigation performance of the physical model and the simulation mathematical model is different, the main dimensions and other parameters such as the center of gravity of the simulation model are modified, step 4 includes specifically: 4.1 : configuring a side hull of the pentamaran as a slant-side hull with a small angle of attack, and determining a slant-side hull inclination angle determining model; 4.2: performing numerical simulation experiments on the mathematical model, and performing polynomial fitting to obtain a slant-side hull layout optimization model; and 4.3 performing an experiment on the physical model, and correcting the slant-side hull layout optimization model according to experimental results, step 4.1 includes specifically: configuring a side hull at a transverse or longitudinal position of the pentamaran as a slant-side hull with a small angle of attack, changing the inclination angle of the slant-side hull, analyzing the influence of different inclination angles of the slant-side hull on the hull resistance characteristics of the pentamaran, building a slant-side hull inclination angle determining model of the pentamaran, and deriving a relationship graph of the resistance and the inclination angle of the slant-side hull, step 4.2 includes specifically: changing the distance between the slant-side hulls and the distance between the slant-side hulls and the main hull, determining various slant-side hull arrangement schemes, simulating the resistance of the pentamaran in different arrangement schemes respectively, determining the wave interference between the main hull and the slant-side hulls in different arrangement schemes, deriving a contour map of the relationship between the resistance and the position of the slant-side hulls, and performing polynomial fitting according to the obtained simulation data to obtain a slant-side hull layout optimization model.
In the specific implementation, based on the hydrodynamic analysis of the slant-side hull, using a resistance estimation module of the commercial software Maxsurf, as shown in Fig. 2, twelve schemes are proposed according to the distance between the slant-side hulls and the distance between the slant-side hulls and the main hull (3 positions on a rear-side hull and 4 positions on a front-side hull). The resistance of the pentamaran model in different layouts (the arrangement scheme of the distance a between the center of the front slant-side hull and the center of the main hull, the distance b between the front slant-side hull and the main hull, the distance c between the center of the rear slant-side hull and the center of the main hull, and the distance d between the rear slant-side hull and the main hull is shown in Table 1) is calculated respectively. Based on the main dimensions and other parameters on the site of Yinhai Yacht Harbor that are unchanged, polynomial fitting is performed according to the stability, roll, pitch, heave and other data of the hull, under the distance between different slant-side hulls and the distance between the slant-side hulls and the main hull, obtained by numerical simulation, to obtain the a slant-side hull layout optimization model.
Table 1 : Arrangement scheme of a, b, c and d of the pentamaran model
Step 4.3 includes specifically:
under the action of a set speed and wave load, calculating the resistance of the physical model of the pentamaran in different slant-side hull arrangement schemes respectively, obtaining the influence of the position change of the slant-side hull on the motion response of the pentamaran, correcting the slant-side hull layout optimization model of step 4.2, and building a slant-side hull layout multi-object optimization model with the arrived conclusions as different constraint conditions and with the highest dynamic stability of the pentamaran as the objective.
Using the experiment in the Yinhai Yacht Harbor as an example, the resistance of the pentamaran model is measured under the specified speed and wave load. It mainly includes: a. the influence of the change of the longitudinal position of the rear side hull on the motion response; b. the influence of the change of the position of the front side hull (longitudinal and vertical directions) on the motion response. A relationship graph of the resistance and the slant-side hull layout is drawn, and finally, the slant-side hull outlay optimization model is corrected based on the experimental data of the physical model, and a slant-side hull layout multi-object optimization model is built with the resistance and motion characteristics meeting the requirements of the pentamaran as different constraint conditions and with the highest dynamic stability of the hull at a high speed as the objective, step 5 includes specifically: 5.1: determining various bow shapes of the pentamaran; 5.2: carrying out numerical simulation experiments on the resistance performance of the pentamarans with different bow shapes, to obtain a contour map of the relationship between the resistance and the bow shape; and 5.3 carrying out physical model experiments on the resistance performance of the pentamarans with different bow shapes respectively, and correcting the contour map of step 5.2.
In step 5.1, according to the latest research results, five types of bows that can effectively improve the ship speed are proposed: bulbous bow, axe-shaped bow, vertical bow, flared bow, and tumble-home bow. Experimental research on the resistance performance of different bows is carried out for the pentamaran to be developed, and the navigation performance of the pentamaran with hydrostatic and different wave loads is analyzed.
The determined pentamaran model combinations are shown in the table below:
The hull part is separated from the bow part to make models, and a hull model is selected to combine with five types of bow models, such that five schemes can be obtained.
In step 5.2, the wave resistance of the pentamarans with different bow shapes (bulbous bow, axe-shaped bow, vertical bow, flared bow and tumble-home bow) is calculated by using the resistance estimation module of the commercial software Maxsurf, and a contour map of the relationship between the resistance and the bow shape is drawn respectively, step 5.3 includes specifically: under the action of a set the speed and hydrostatic load, measuring the resistance of the pentamarans with different bow shapes in the still water respectively; under the action of a set speed and different wave loads, measuring the resistance of the pentamarans with different bow shapes under counterflow wave loads respectively; and correcting the contour map of step 5.2 based on the resistance obtained.
In the specific implementation, the wave resistance of the pentamaran in static water, (different wave direction angles, 0-90° from the bow at 30° intervals) regular waves and irregular waves, etc. totaling nine working conditions, is measured, and a contour map of the relationship between the resistance and the bow shape is drawn and corrected. The measurement of resistance is achieved as follows: a. Specifying the speed, and measuring the resistance of five combinations of ship models in still water under experimental loads;
b. Specifying the speed, and measuring the resistance of the ship models under counterflow wave loads when the five combinations of ship models are under the action of wave loads, step 6 includes specifically: 6.1: determining an optimized pentamaran model with the optimal slant-side hull layout, carrying out a numerical simulation experiment, and analyzing the stability of the pentamaran model; 6.2: performing a physical model experiment on the pentamaran model to obtain the course stability and roll characteristic of the pentamaran model; and 6.3: based on steps 6.1 and 6.2, obtaining a vector variance curve diagram of time history curves of the motion of the pentamaran model under different wave loads, step 6.1 includes specifically: determining an optimized pentamaran model with the optimal slant-side hull layout, carrying out a numerical simulation experiment, and analyzing the stability when the hull is intact and when the hull is damaged to obtain a static stability curve and a dynamic stability curve; and under different wave loads, determining the vertical, longitudinal and roll motion responses of the pentamaran model.
In the specific implementation, using a stability module of the commercial software Maxsurf, the stability is analyzed when the hull is intact and when the hull is damaged, and the static stability curve and the dynamic stability curve are obtained.
Using the commercial software AWQA, the vertical, longitudinal and roll motion responses of the novel pentamaran (different bow + optimal slant-side hull layout) are obtained under different wave loads.
Obtaining the course stability in step 6.2 includes specifically: arranging a propeller, an acceleration sensor and an angular acceleration sensor for the pentamaran model, carrying out a propeller experiment and an inverse propeller experiment, obtaining the displacements and rotation angles of the two experiments according to acceleration data and angular acceleration data of the two experiments, and then plotting the track and determining the course stability of the pentamaran.
In the specific implementation, a pentamaran model stability experiment is carried out.
The main physical quantities required to be measured and recorded in the experiment include a ship model displacement and rotation angle. The measurement method is introduced as follows: i. selecting an appropriate propeller for the pentamaran model according to model experiment criteria; ii. reasonably arranging the acceleration sensor and the angular acceleration sensor on the pentamaran model; iii. carrying out a propeller experiment on the pentamaran model; and iv. carrying out an inverse propeller experiment on the pentamaran model.
The acceleration data obtained in the ship model propeller experiment and the ship model inverse propeller experiment is integrated twice to obtain the displacements and rotation angles of the ship model propeller experiment and the ship model inverse propeller experiment, and then the track is drawn and the course stability of the pentamaran is determined.
Obtaining the roll characteristic in step 6.2 includes specifically: applying a tilting moment to the pentamaran model to tilt it, removing the moment so that the pentamaran model enters a ffee-sway state, and recording the inclination angle of the pentamaran model in the process; and when the roll amplitude of the pentamaran model is less than a set value, stopping the experiment, calculating a roll period according to the obtained inclination data, and determining its roll characteristic.
In the movement of the ship in six directions, the roll has the greatest influence on the ship, so it is critical to measure the roll period. If the roll period of the pentamaran is close to the wave period, resonance will occur.
In the specific implementation, a roll period test method is as follows: i. confirming that the water surface has no fluctuation and that the ship model is not moving; ii. running inclination angle test software; iii. applying a tilting moment to the ship to tilt it; iv. removing the tilting force so that the ship enters a ffee-roll state; V. when the roll amplitude of the ship is small, stopping recording data.
The roll period is calculated from the recorded roll data.
Described above are merely preferred embodiments of the present application, which are not used for limiting the present application, and to those skilled in the art, various modifications and changes may be made to the present application. All modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present application shall be encompassed within the protection scope of the present application.
Claims (10)
1. A design method for optimizing comprehensive performance of a pentamaran, comprising the following steps: step 1 : building a pentamaran model according to structural design parameters of the pentamaran; step 2: establishing a mathematical model for the pentamaran model and performing hydrodynamic performance analysis; step 3: according to experimental conditions, designing a physical model, and modifying the mathematical model after preliminary calculation of the parameters; step 4: configuring a side hull of the pentamaran as a slant-side hull with a small angle of attack to optimize the layout of the slant-side hull; step 5: comparing pentamaran bow shapes to analyze the resistance performance of different bow shapes; and step 6: determining an optimized pentamaran model and performing experimental analysis on the stability and motion characteristics of the optimized pentamaran model.
2. The method of claim 1, wherein step 2 comprises specifically: according to the pentamaran model of step 1, establishing a mathematical model of the pentamaran by numerical simulation, and further performing preliminary analysis of hydrodynamic performance of wave resistance and stability; and step 3 comprises specifically: according to experimental conditions and the loading requirements, designing a physical model, and preliminarily determining basic parameters of the physical model; according to the differences of field experiment results between the mathematical model and the physical model, modifying the parameters of the mathematical model.
3. The method of claim 1, wherein step 4 comprises specifically: 4.1: configuring a side hull of the pentamaran as a slant-side hull with a small angle of attack, and determining a slant-side hull inclination angle determining model; 4.2: performing numerical simulation experiments on the mathematical model, and performing polynomial fitting to obtain a slant-side hull layout optimization model; and 4.3 performing an experiment on the physical model, and correcting the slant-side hull layout optimization model according to experimental results.
4. The method of claim 3, wherein step 4.1 comprises specifically: configuring a side hull at a transverse or longitudinal position of the pentamaran as a slant-side hull with a small angle of attack, changing the inclination angle of the slant-side hull, analyzing the influence of different inclination angles of the slant-side hull on the hull resistance characteristics of the pentamaran, building a slant-side hull inclination angle determining model of the pentamaran, and deriving a relationship graph of the resistance and the inclination angle of the slant-side hull.
5. The method of claim 3, wherein step 4.2 comprises specifically: changing the distance between the slant-side hulls and the distance between the slant-side hulls and the main hull, determining various slant-side hull arrangement schemes, simulating the resistance of the pentamaran in different arrangement schemes respectively, determining the wave interference between the main hull and the slant-side hulls in different arrangement schemes, deriving a contour map of the relationship between the resistance and the position of the slant-side hulls, and performing polynomial fitting according to the obtained simulation data to obtain a slant-side hull layout optimization model.
6. The method of claim 3, wherein step 4.3 comprises specifically: under the action of a set speed and wave load, calculating the resistance of the physical model of the pentamaran in different slant-side hull arrangement schemes respectively, obtaining the influence of the position change of the slant-side hull on the motion response of the pentamaran, correcting the slant-side hull layout optimization model of step 4.2, and building a slant-side hull layout multi-object optimization model with the arrived conclusions as different constraint conditions and with the highest dynamic stability of the pentamaran as the objective.
7. The method of claim 1, wherein step 5 comprises specifically: 5.1: determining various bow shapes of the pentamaran; 5.2: carrying out numerical simulation experiments on the resistance performance of the pentamarans with different bow shapes, to obtain a contour map of the relationship between the resistance and the bow shape; and 5.3 carrying out physical model experiments on the resistance performance of the pentamarans with different bow shapes respectively, and correcting the contour map of step 5.2; step 5.3 comprises specifically: under the action of a set the speed and hydrostatic load, measuring the resistance of the pentamarans with different bow shapes in the still water respectively; under the action of a set speed and different wave loads, measuring the resistance of the pentamarans with different bow shapes under counterflow wave loads respectively; and correcting the contour map of step 5.2 based on the resistance obtained.
8. The method of claim 1, wherein step 6 comprises specifically: 6.1: determining an optimized pentamaran model with the optimal slant-side hull layout, carrying out a numerical simulation experiment, and analyzing the stability of the pentamaran model; 6.2: performing a physical model experiment on the pentamaran model to obtain the course stability and roll characteristic of the pentamaran model; and 6.3: based on steps 6.1 and 6.2, obtaining a vector variance curve diagram of time history curves of the motion of the pentamaran model under different wave loads.
9. The method of claim 8, wherein step 6.1 comprises specifically: determining an optimized pentamaran model with the optimal slant-side hull layout, carrying out a numerical simulation experiment, and analyzing the stability when the hull is intact and when the hull is damaged to obtain a static stability curve and a dynamic stability curve; and under different wave loads, determining the vertical, longitudinal and roll motion responses of the pentamaran model; obtaining the course stability in step 6.2 comprises specifically: arranging a propeller, an acceleration sensor and an angular acceleration sensor for the pentamaran model, carrying out a propeller experiment and an inverse propeller experiment, obtaining the displacements and rotation angles of the two experiments according to acceleration data and angular acceleration data of the two experiments, and then plotting the track and determining the course stability of the pentamaran.
10. The method of claim 8, wherein obtaining the roll characteristic in step 6.2 comprises specifically: applying a tilting moment to the pentamaran model to tilt it, removing the moment so that the pentamaran model enters a free-sway state, and recording the inclination angle of the pentamaran model in the process; and when the roll amplitude of the pentamaran model is less than a set value, stopping the experiment, calculating a roll period according to the obtained inclination data, and determining its roll characteristic.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711049275.4A CN107813902A (en) | 2017-10-31 | 2017-10-31 | Wutai rock group overall performance optimization design method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| LU100972A1 LU100972A1 (en) | 2019-03-15 |
| LU100972B1 true LU100972B1 (en) | 2019-04-25 |
Family
ID=61603546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU100972A LU100972B1 (en) | 2017-10-31 | 2018-02-28 | Design method for optimizing comprehensive performance of pentamaran |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN107813902A (en) |
| LU (1) | LU100972B1 (en) |
| WO (1) | WO2019085352A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109408871B (en) * | 2018-09-13 | 2023-04-21 | 中国人民解放军92942部队 | Rapid generation method of safe navigation strategy of damaged ship |
| CN109591966B (en) * | 2018-12-03 | 2021-05-04 | 江苏科技大学 | Inland lake water area monitoring twin-body unmanned ship and information cooperation ship |
| CN112498603B (en) * | 2019-08-26 | 2021-09-03 | 哈尔滨工程大学 | Three-body ship falling body slamming test main body weakening model |
| CN110758670B (en) * | 2019-10-31 | 2022-03-01 | 上海船舶运输科学研究所 | Double-rod ship wave-resistant performance tester |
| CN111723535B (en) * | 2020-06-12 | 2023-03-10 | 电子科技大学 | Yacht drag reduction optimization method based on hull free deformation |
| CN112591029B (en) * | 2020-11-27 | 2022-05-20 | 英辉南方造船（广州番禺）有限公司 | Linear design method for adjusting high-speed ship buoyancy |
| CN112849359B (en) * | 2021-02-09 | 2022-01-07 | 中交第三航务工程局有限公司 | Method for determining main scale of ultra-large piling ship based on wave resistance calculation |
| CN115042933A (en) * | 2022-04-27 | 2022-09-13 | 广船国际有限公司 | Method, device, equipment and medium for outputting ship stability parameters |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5178085A (en) * | 1992-02-26 | 1993-01-12 | The United States Of America As Represented By The Secretary Of The Navy | Wave cancellation multihull ship |
| FR2937947B1 (en) * | 2008-11-05 | 2010-12-31 | Stx France Cruise Sa | PASSENGER SHIP WITH EXTERIOR COURSIVES WITH VENTILATION MEANS. |
| CN101863304A (en) * | 2010-06-25 | 2010-10-20 | 哈尔滨工程大学 | Inclined lateral triple-hulled vessel |
| JP2013154756A (en) * | 2012-01-30 | 2013-08-15 | Ihi Corp | Multi-hull ship |
| FR2997919A1 (en) * | 2012-11-15 | 2014-05-16 | Marie Francois Herve Berguerand | Variable floating rapid navigation device for e.g. cargo liner, has legs/arms exhibiting variable height according to state of sea and allowing lifting and stabilization of ship without ballasting process and undergoing impact of waves |
| JP2014237424A (en) * | 2013-06-06 | 2014-12-18 | 良行 金城 | Flight water surface slide ship |
| CN105905248A (en) * | 2016-04-22 | 2016-08-31 | 四方继保（武汉）软件有限公司 | Double-M five-body unmanned ship |
| CN106709135B (en) * | 2016-11-15 | 2022-12-06 | 中国舰船研究设计中心 | Three-body ship type sheet body layout optimization design method based on viscous wave flow field analysis |
-
2017
- 2017-10-31 CN CN201711049275.4A patent/CN107813902A/en active Pending
-
2018
- 2018-02-28 WO PCT/CN2018/077499 patent/WO2019085352A1/en active Application Filing
- 2018-02-28 LU LU100972A patent/LU100972B1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019085352A1 (en) | 2019-05-09 |
| LU100972A1 (en) | 2019-03-15 |
| CN107813902A (en) | 2018-03-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| LU100972B1 (en) | Design method for optimizing comprehensive performance of pentamaran | |
| Yun et al. | High speed catamarans and multihulls: technology, performance, and applications | |
| Karimi et al. | An experimental study of interceptor’s effectiveness on hydrodynamic performance of high-speed planing crafts | |
| Xu et al. | A numerical study on side hull optimization for trimaran | |
| Wilson | Basic naval architecture | |
| KR101227953B1 (en) | Method and apparatus for hull design | |
| CN105836079A (en) | Triangular-section power draft-increase ballast-free semi-submersible conveying ship | |
| Asmara et al. | Seakeeping and resistance analysis of 1200 GT passenger ship fitted with NACA 4412 stern foil using CFD method | |
| Atlar et al. | Anti-slamming bulbous bow and tunnel stern applications on a novel Deep-V catamaran for improved performance | |
| Ueno et al. | A simple method to estimate wind loads on ships | |
| CN110457827B (en) | General calculation method for resistance of yacht movement mathematical model in yacht simulator | |
| CN111210692A (en) | Real-time simulation method for motion of pleasure-boat dolphin in yacht simulator | |
| Davis et al. | Motion and passenger discomfort on high speed catamarans in oblique seas | |
| Davis et al. | A comparison of the motions of trimarans, catamarans and monohulls | |
| Brizzolara et al. | The second generation of unmanned surface vehicles: design features and performance predictions by numerical simulations | |
| Ariffin et al. | A Numerical Study for Level 1 Second Generation Intact Stability Criteria | |
| Zanella | Improved Sailboat Design Process and Tools Using Systems Engineering Approach | |
| Wei et al. | Hull forms of small high-speed wave-piercing monohull crafts and hydrodynamics study | |
| Wang et al. | Investigation of the 2.5 D method in added resistance prediction of high speed trimaran | |
| Loveday | The design of a hydrofoil system for sailing catamarans | |
| Fraize et al. | Conceptual Design of an Autonomous Sailing Vessel | |
| CN103303431A (en) | Bilge for ocean engineering auxiliary ship | |
| Im et al. | A Study on Ship's Maneuverability Evaluation by Real Ship Test | |
| Grande et al. | Prediction of slamming occurrence on catamaran cross structures | |
| Yun et al. | Other High-Speed Multihull Craft |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FG | Patent granted |
Effective date: 20190425 |