CN117669259A - Dragon boat drag reduction method and system based on floating state - Google Patents
Dragon boat drag reduction method and system based on floating state Download PDFInfo
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Abstract
The invention belongs to the technical field of ship speed optimization, and discloses a dragon boat drag reduction method and a dragon boat drag reduction system based on a floating state, wherein the method comprises the following steps of S1: acquiring the weights of a dragon boat athlete and a boat body and historical optimal rowing speed; s2: acquiring a plurality of rowing speeds and a plurality of pitch angles in a speed range containing the historical optimal rowing speed; s3: and obtaining total resistance of different pitch angles under different rowing speeds, wherein the pitch angle corresponding to the minimum total resistance is the optimal pitch floating state, and arranging according to the weight of a dragon boat athlete so that the dragon boat is in the optimal pitch floating state. The method and the device can further reduce the navigation resistance of the dragon boat and improve the speed of the dragon boat.
Description
Technical Field
The invention belongs to the technical field of ship speed optimization, and particularly relates to a dragon boat drag reduction method and system based on a floating state.
Background
Dragon boat sports, also called Dragon boat competition, is a long-lasting athletic activity carried by our country, and has vivid national characteristics and historic cultural background. The dragon boat sports culture and activity has folk and tradition, and is favored by people with the characteristic of vivid folk character and wide masses as well as the characteristic of vigorous sports competition. The popularization and development of the dragon boat exercise effectively promote the progress of the overall body building of China, and the dragon boat exercise culture has positive influence on the attitudes and spirit of people while strengthening the physical health of people, thereby encouraging the people to rush forward.
Dragon boat sports are widely developed in the world, competition is very strong, and in order to improve competition results, scientific research projects of the project are increasingly high in various countries, and the scientific research content of the project is continuously improved. The dragon boat competition is a rhythmic and technically strong speed endurance sports item, and is also a sports item which is harder and harder in water sports item, has higher technical difficulty and requires integral coordination. With the further popularization of the dragon boat sports, the technical level of the dragon boat sports is also greatly improved. In a dragon boat game, good game performance is related to physical ability and tactical training on one hand and on the other hand depends on the hydrodynamic performance of the dragon boat body.
In order to improve the performance of dragon boat games, most training aims at improving the strength and physical ability, the matching degree and the force-exerting mode of athletes. In the aspect of the hydrodynamic performance of the dragon boat, the final performance in the competition can be improved by reducing the sailing resistance of the dragon boat. According to the trim drag reduction theory, the invention provides a dragon boat drag reduction method based on a floating state, which has important practical significance for improving the performance of a dragon boat game.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a dragon boat drag reduction method and a system based on a floating state, which can further reduce the navigation resistance of the dragon boat and improve the speed of the dragon boat.
To achieve the above object, according to one aspect of the present invention, there is provided a method for drag reduction of a dragon boat based on a floating state, comprising: s1: acquiring the weights of a dragon boat athlete and a boat body and historical optimal rowing speed; s2: acquiring a plurality of rowing speeds and a plurality of pitch angles in a speed range containing the historical optimal rowing speed; s3: and obtaining total resistance of different pitch angles under different rowing speeds, wherein the pitch angle corresponding to the minimum total resistance is the optimal pitch floating state, and arranging according to the weight of a dragon boat athlete so that the dragon boat is in the optimal pitch floating state.
Preferably, in step S3, numerical simulation or model experiments are used to obtain the total resistance of different pitch angles at different rowing speeds.
Preferably, the pitch angle is obtained in step S2 from the draft, which is the average draft at the ship.
Preferably, the pitch angle θ in step S2 is:
wherein d F Is the draft of the bow of the dragon boat, d A The draft of the stern of the dragon boat is given, and L is the captain of the dragon boat.
Preferably, the ranking in step S3 according to the weight of the dragon boat player is specifically: sequencing the dragon boat athletes according to the weight; and sequentially carrying out seat arrangement on the sequenced dragon boat athletes from the two ends of the bow and the stern, stopping arranging if the optimal trim floating state is achieved, and carrying out fine adjustment on seats of the dragon boat athletes in the middle position if the optimal trim floating state is not achieved.
Another aspect of the present application provides a buoyancy-based dragon boat drag reduction system, comprising: a first acquisition module: the method is used for acquiring the weight of the dragon boat athlete and the boat body and the historical optimal rowing speed; and a second acquisition module: a plurality of rowing speeds and a plurality of pitch angles in a speed range including a historical optimal rowing speed are obtained; and a sequencing module: and the pitch angles corresponding to the minimum total resistance are the optimal pitch floating states, and the dragon boat is arranged according to the weight of the dragon boat athlete so as to be in the optimal pitch floating states.
Preferably, numerical simulation or model experiments are adopted in the sequencing module to obtain the total resistance of different pitch angles at different rowing speeds.
Preferably, the second acquisition module obtains the trim angle from the draft, which is the average draft at the in-ship.
Preferably, the pitch angle θ in the second acquisition module is:
wherein d F Is the draft of the bow of the dragon boat, d A The draft of the stern of the dragon boat is given, and L is the captain of the dragon boat.
Preferably, the ranking module ranks according to the weight of the dragon boat athlete specifically as follows: sequencing the dragon boat athletes according to the weight; and sequentially carrying out seat arrangement on the sequenced dragon boat athletes from the two ends of the bow and the stern, stopping arranging if the optimal trim floating state is achieved, and carrying out fine adjustment on seats of the dragon boat athletes in the middle position if the optimal trim floating state is not achieved.
In general, compared with the prior art, the dragon boat drag reduction method and system based on the floating state provided by the invention have the following advantages:
1. according to the method and the device, the position distribution of the dragon boat athlete can be adjusted under the condition that the structure of the dragon boat is not changed, so that the dragon boat can run under the condition that the resistance is minimum, the sailing speed of the dragon boat can be further improved, and the competition performance is improved.
2. When the dragon boat athletes are ordered, the boat body is ordered according to the weight, so that the stability of the boat body in the ranking process is guaranteed, and the ranking efficiency is improved.
Drawings
FIG. 1 is a schematic illustration of the steps of the buoyancy-based dragon boat drag reduction method of the present application;
FIG. 2 is a schematic view of a trim float state of a dragon boat according to an embodiment of the present application;
figure 3 is a top view of a dragon boat player distribution according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The resistance of the dragon boat in still water can be divided into three phenomena according to the flow of the dragon boat: firstly, when the dragon boat advances, waves are excited to change the surface pressure distribution of the boat, and pressure difference appears at the head and the tail, so that the resistance of the dragon boat is wave-making resistance; secondly, due to the viscosity of water, a boundary layer appears on the surface of the dragon boat during movement, so that the dragon boat is subjected to viscous force during traveling, and the friction resistance is reasonable in the movement direction; thirdly, because the surface structure of the dragon boat is complex, the front and the tail of the dragon boat usually have larger curvature change, so vortex flow is also often generated at the tail of the dragon boat, the water pressure at the vortex flow is reduced, the front and the back of the boat body are caused to generate pressure difference, and the resistance caused by the pressure difference is the viscous pressure resistance.
The resistance that the dragon boat receives when navigating is influenced by multiple factor, including speed, displacement, draft and pitch etc. when dragon boat pitch angle changed, cause boat body underwater geometry, dragon boat wet area, the mobile state of the fluid around the boat body etc. also change correspondingly to lead to the viscosity resistance of the boat body, frictional resistance etc. to change, consequently, if the dragon boat can keep good navigation floating state, alright effectively reduce hull navigation resistance, improve navigation speed and then improve dragon boat match score.
In the process of sailing the dragon boat, the total resistance of the dragon boat can be effectively reduced by adjusting the floating state of the dragon boat in advance, so that the speed of the dragon boat when the dragon boat is stroked is further improved, and better results can be obtained in a dragon boat competition. By adjusting the floating state of the dragon boat in advance, the total resistance of the dragon boat can be effectively reduced, and the speed of the dragon boat during rowing is further improved. Because the dragon boat athlete and the weight thereof which play a competition or training have changes, the changes can influence the floating state of the dragon boat, the dragon boat athlete and the weight thereof which play the competition or training need to be determined, and the water displacement of the dragon boat can be obtained by adding the self weight of the dragon boat. When the water discharge amount of the dragon boat is determined, an optimal pitching floating state is always arranged near the fastest rowing speed, so that the total resistance of the dragon boat sailing is minimum. And according to the self weight and the pitching boundary of the dragon boat, taking a plurality of speeds and a plurality of pitching angles near the fastest rowing speed, and obtaining the total resistance of different pitching angles at a plurality of speeds through a numerical calculation method or a model test, so as to obtain the optimal pitching floating state in the speed range. Therefore, the position of the dragon boat athlete can be adjusted to enable the dragon boat to be in an optimal pitching floating state, and in particular, the application provides a dragon boat drag reduction method based on the floating state, as shown in fig. 1, which comprises the following steps S1-S3.
S1: the weight of the dragon boat athlete and the boat body is obtained, and the historical optimal rowing speed is obtained.
Firstly, determining draft and drainage of the dragon boat after bearing each athlete, and determining the speed range of the dragon boat through empirical data.
S2: a plurality of rowing speeds and a plurality of pitch angles within a speed range including a historical optimal rowing speed are obtained.
When the water discharge amount of the dragon boat is determined, an optimal pitching floating state is always arranged near the optimal rowing speed, so that the total resistance of the dragon boat sailing is minimum. And taking a plurality of speeds and a plurality of pitching angles near the optimal rowing speed according to the self weight of the dragon boat and the pitching boundary.
As shown in FIG. 2, the dragon boat is in a pitching floating state, wherein the longitudinal section is vertical to the static water surface, the middle cross section forms a longitudinal inclination angle theta with the plumb plane, the point G represents the gravity center position of the dragon boat, and d F And d A Respectively the first and the last draft of the dragon boat, d represents the average draft of the dragon boat, i.e. the draft at the midship, d=0.5 (d F +d A )。
The pitch angle θ is:
wherein d F Is the draft of the bow of the dragon boat, d A The draft of the stern of the dragon boat is given, and L is the captain of the dragon boat.
S3: and obtaining total resistance of different pitch angles under different rowing speeds, wherein the pitch angle corresponding to the minimum total resistance is the optimal pitch floating state, and arranging according to the weight of a dragon boat athlete so that the dragon boat is in the optimal pitch floating state.
And obtaining the total resistance of different pitching angles at different rowing speeds through numerical simulation or model experiments, and obtaining the optimal pitching floating state in the speed range.
As shown in figure 3, in the international standard dragon boat competition, the number of the athletes is 22, wherein the athletes numbered 1-20 are rowers, are symmetrically distributed on the port and starboard sides of the dragon boat, are the most roles on the dragon boat, and are responsible for making the dragon boat generate forward propelling force by rowing water and keeping the boat body balanced; a is a drummer positioned at the head part of the dragon boat and is responsible for adjusting the rhythm of the dragon boat by using the drummer, so that the strength of the marker is more concentrated and the advancing speed of the dragon boat is accelerated; and B is a rudder man positioned at the tail part of the dragon boat and is responsible for controlling the direction and the speed of the whole dragon boat, ensuring that the dragon boat keeps the optimal state in the competition, and also needing to be closely matched with a team member to master the rhythm and tactics of the whole competition. The floating state of the dragon boat can be adjusted by adjusting the position of the athlete of the dragon boat.
In a further scheme, the ranking according to the weight of the dragon boat athlete is specifically as follows: sequencing the dragon boat athletes according to the weight; and sequentially carrying out seat arrangement on the sequenced dragon boat athletes from the two ends of the bow and the stern, stopping arranging if the optimal trim floating state is achieved, and carrying out fine adjustment on seats of the dragon boat athletes in the middle position if the optimal trim floating state is not achieved.
Another aspect of the present application provides a buoyancy-based dragon boat drag reduction system, comprising:
a first acquisition module: the method is used for acquiring the weight of the dragon boat athlete and the boat body and the historical optimal rowing speed;
and a second acquisition module: a plurality of rowing speeds and a plurality of pitch angles in a speed range including a historical optimal rowing speed are obtained;
and a sequencing module: and the pitch angles corresponding to the minimum total resistance are the optimal pitch floating states, and the dragon boat is arranged according to the weight of the dragon boat athlete so as to be in the optimal pitch floating states.
In a further preferred embodiment, the ranking module obtains the total resistance of different pitch angles at different rowing speeds by numerical simulation or model experiments.
In a further preferred embodiment, the second acquisition module obtains the trim angle from the draft, which is the average draft at the in-ship.
In a further preferred embodiment, the pitch angle θ in the second acquisition module is:
wherein d F Is the draft of the bow of the dragon boat, d A The draft of the stern of the dragon boat is given, and L is the captain of the dragon boat.
In a further preferred scheme, the ranking module ranks according to the weight of the dragon boat athlete specifically as follows:
sequencing the dragon boat athletes according to the weight;
and sequentially carrying out seat arrangement on the sequenced dragon boat athletes from the two ends of the bow and the stern, stopping arranging if the optimal trim floating state is achieved, and carrying out fine adjustment on seats of the dragon boat athletes in the middle position if the optimal trim floating state is not achieved.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A method of drag reduction for a dragon boat based on a floating state, comprising:
s1: acquiring the weights of a dragon boat athlete and a boat body and historical optimal rowing speed;
s2: acquiring a plurality of rowing speeds and a plurality of pitch angles in a speed range containing the historical optimal rowing speed;
s3: and obtaining total resistance of different pitch angles under different rowing speeds, wherein the pitch angle corresponding to the minimum total resistance is the optimal pitch floating state, and arranging according to the weight of a dragon boat athlete so that the dragon boat is in the optimal pitch floating state.
2. The method according to claim 1, wherein in step S3, numerical simulation or model experiments are used to obtain the total resistance of different pitch angles at different rowing speeds.
3. The method according to claim 1, characterized in that the pitch angle is obtained in step S2 from the draft, which is the average draft at the ship.
4. A method according to claim 1 or 3, wherein the pitch angle θ in step S2 is:
wherein d F Is the draft of the bow of the dragon boat, d A The draft of the stern of the dragon boat is given, and L is the captain of the dragon boat.
5. The method according to claim 1, wherein the ranking in step S3 according to the weight of the dragon boat player is specifically:
sequencing the dragon boat athletes according to the weight;
and sequentially carrying out seat arrangement on the sequenced dragon boat athletes from the two ends of the bow and the stern, stopping arranging if the optimal trim floating state is achieved, and carrying out fine adjustment on seats of the dragon boat athletes in the middle position if the optimal trim floating state is not achieved.
6. A buoyancy-based dragon boat drag reduction system, comprising:
a first acquisition module: the method is used for acquiring the weight of the dragon boat athlete and the boat body and the historical optimal rowing speed;
and a second acquisition module: a plurality of rowing speeds and a plurality of pitch angles in a speed range including a historical optimal rowing speed are obtained;
and a sequencing module: and the pitch angles corresponding to the minimum total resistance are the optimal pitch floating states, and the dragon boat is arranged according to the weight of the dragon boat athlete so as to be in the optimal pitch floating states.
7. The system of claim 6, wherein the ranking module obtains the total resistance of different pitch angles at different rowing speeds using numerical modeling or model experiments.
8. The system of claim 6, wherein the second acquisition module obtains the trim angle from a draft, the draft being an average draft at the vessel.
9. The system of claim 6 or 8, wherein the pitch angle θ in the second acquisition module is:
wherein d F Is the draft of the bow of the dragon boat, d A The draft of the stern of the dragon boat is given, and L is the captain of the dragon boat.
10. The system of claim 6, wherein the ranking module ranks according to the weight of the dragon boat athlete in particular as:
sequencing the dragon boat athletes according to the weight;
and sequentially carrying out seat arrangement on the sequenced dragon boat athletes from the two ends of the bow and the stern, stopping arranging if the optimal trim floating state is achieved, and carrying out fine adjustment on seats of the dragon boat athletes in the middle position if the optimal trim floating state is not achieved.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207773404U (en) * | 2018-01-26 | 2018-08-28 | 蓝绍辉 | A kind of Novel marine dipmeter with rectangular coordinate system scale label panel |
| CN109658544A (en) * | 2018-12-06 | 2019-04-19 | 上港集团长江港口物流有限公司 | Inner branch line container ship energy efficiency management system and its implementation |
| CN110979583A (en) * | 2019-12-16 | 2020-04-10 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Ship trim optimization method and device and electronic equipment |
| CN111409808A (en) * | 2020-04-03 | 2020-07-14 | 武汉理工大学 | Electrical push flat-bottom cargo ship resistance reduction energy-saving control system based on neural network algorithm |
| CN112009636A (en) * | 2020-08-21 | 2020-12-01 | 武汉理工大学 | Intelligent loading and drag reduction system and method for ship navigation |
| CN115795663A (en) * | 2022-11-15 | 2023-03-14 | 中国地质大学（武汉） | Method for determining optimal trim navigation of ship under actual sea condition |
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- 2023-12-26 CN CN202311814678.9A patent/CN117669259A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207773404U (en) * | 2018-01-26 | 2018-08-28 | 蓝绍辉 | A kind of Novel marine dipmeter with rectangular coordinate system scale label panel |
| CN109658544A (en) * | 2018-12-06 | 2019-04-19 | 上港集团长江港口物流有限公司 | Inner branch line container ship energy efficiency management system and its implementation |
| CN110979583A (en) * | 2019-12-16 | 2020-04-10 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Ship trim optimization method and device and electronic equipment |
| CN111409808A (en) * | 2020-04-03 | 2020-07-14 | 武汉理工大学 | Electrical push flat-bottom cargo ship resistance reduction energy-saving control system based on neural network algorithm |
| CN112009636A (en) * | 2020-08-21 | 2020-12-01 | 武汉理工大学 | Intelligent loading and drag reduction system and method for ship navigation |
| CN115795663A (en) * | 2022-11-15 | 2023-03-14 | 中国地质大学（武汉） | Method for determining optimal trim navigation of ship under actual sea condition |
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