CN114964444A - Ship weight calculation method based on dock inflow - Google Patents
Ship weight calculation method based on dock inflow Download PDFInfo
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- CN114964444A CN114964444A CN202210562133.2A CN202210562133A CN114964444A CN 114964444 A CN114964444 A CN 114964444A CN 202210562133 A CN202210562133 A CN 202210562133A CN 114964444 A CN114964444 A CN 114964444A
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- liquid
- cavity
- ship
- dock
- weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C1/00—Dry-docking of vessels or flying-boats
- B63C1/08—Graving docks
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a ship weight calculation method based on dock inflow, which comprises the steps of preparing a cavity with a closed lower end, wherein a cavity is formed in the cavity, the cavity is communicated with a liquid source through a liquid inlet channel, a flowmeter and a valve are arranged on the liquid inlet channel, and a ship is placed in the cavity; obtaining the density of the liquid source, and calculating the bottom area of the cavity; opening the valve to send the liquid in the liquid source into the containing cavity; after the ship floats, closing the valve, and recording the total volume of the liquid inlet according to the flow meter; obtaining the draught height in the containing cavity; calculating according to the bottom area, the liquid level height and the total volume of the liquid inlet to obtain the weight of the ship; the ship weight calculation method based on the dock inflow can accurately and quickly calculate the weight of a new ship when the new ship is launched, does not need to utilize the line type of the outer plate, eliminates the serious dependence of the traditional ship weight measurement on the manufacturing precision of the outer plate, eliminates the influence of the manufacturing precision error of the outer plate on the ship weight measurement, reduces the cost and saves the production period.
Description
Technical Field
The invention relates to the technical field of ship processes, in particular to a ship weight calculation method based on dock inflow.
Background
The weight of a ship needs to be measured after a new ship is finished, and the traditional method is that outer plate draft scales are read through an inclination experiment, and then the displacement (weight) is calculated based on a theoretical line value. In this method, it is assumed that the profile of the outer panel is the same as the theoretical profile in the calculation, and the influence of the thickness of the outer panel and the manufacturing error is not considered in general, so that the actual weight of the ship has an error, and this error has a direct relationship with the manufacturing accuracy of the shipyard. If the manufacturing precision is poor, the error is large, and the error cannot be found in the traditional ship weight measurement, but the error can bring adverse effect to the total longitudinal bending moment of the ship, and the phenomenon that the total longitudinal bending of the hull beam cannot bear can occur under the extreme sea condition, so that the ship is fatally lost. Therefore, there is a need to improve the existing ship weight measurement method, and to provide a new ship weight measurement method that can effectively and accurately measure the weight of a newly built ship without increasing the ship weight measurement cost.
Disclosure of Invention
The invention aims to overcome the defects and provides a ship weight calculating method based on the dock inflow, which can accurately and quickly calculate the weight of a new ship when the ship is launched.
The invention provides a ship weight calculation method based on dock inflow, which comprises the following steps: preparing a cavity with a closed lower end, wherein a cavity is formed in the cavity and is communicated with a liquid source through a liquid inlet channel, a flowmeter and a valve are arranged on the liquid inlet channel, and a ship is placed in the cavity; step two, obtaining the density of a liquid source, and calculating the bottom area of the cavity; opening a valve to send the liquid in the liquid source into the containing cavity; step four, after the ship floats, closing the valve, and recording the total volume of the feed liquid according to the flow meter; step five, standing for a preset time to obtain the draught height in the containing cavity; and step six, calculating according to the bottom area, the draft height and the total volume of the liquid inlet to obtain the weight of the ship.
Furthermore, each side wall of the containing cavity is respectively provided with a height indicating part, the height indicating part is provided with different scale values corresponding to different sizes of the liquid level height and used for indicating the liquid level height on the corresponding side wall, in the fourth step, the liquid level height on each side wall is read, and the average value of all the liquid level heights is calculated and used as the draft height in the containing cavity.
Further, the height indicator has a dimensional accuracy of at least centimeters.
Furthermore, the cavity is cuboid.
Further, the cavity is a dock.
Further, the density of a docking block and a skid arranged at the bottom of the dock are both larger than the density of liquid, the volume of the docking block and the skid is determined in the second step, and in the sixth step, the weight of the ship is calculated according to the floor area, the draft height, the volume of the docking block and the skid and the total volume of the liquid inlet.
Further, the formula for calculating the weight of the ship is M = ρ [ (. s.. h-V) ] 1 -V 2 ) Wherein M is ship weight, rho is liquid density, h is draft height, V 1 Is the total volume of feed liquor, V 2 The volume of the docking blocks and the skid.
Furthermore, a plurality of liquid inlets are formed in the side wall and the bottom wall of the dock, the liquid inlets are communicated with a liquid source through liquid inlet channels, and each liquid inlet is provided with a flow meter.
The invention has the beneficial effects that: the ship weight calculation method based on the dock inflow can accurately and quickly calculate the weight of a new ship when launching, does not need to utilize the line type of the outer plate, eliminates the serious dependence of the traditional ship weight measurement on the manufacturing precision of the outer plate, eliminates the influence of the manufacturing precision error of the outer plate on the ship weight measurement, reduces the cost and saves the production period.
Drawings
FIG. 1 is a flow chart of the operation of a method for calculating the weight of a vessel based on the intake flow of a dock according to an embodiment of the present invention;
fig. 2 is a schematic view of the structure of a dock in an embodiment of the present invention.
In the figure, 1 is a dock, 2 is a cavity, 3 is a docking block and a skid, 4 is a flow meter, 5 is a valve, and 6 is a ship.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is an operation flowchart of a ship weight calculation method based on a dock inflow rate according to an embodiment of the present invention. Fig. 2 is a schematic view of the structure of a dock in an embodiment of the present invention.
As shown in fig. 1 and 2, the method for calculating the weight of the ship based on the dock inflow rate in the embodiment includes the following steps:
step one, preparing a dock 1: a regular cavity 2 is formed in the dock 1, and sundries at the bottom of the cavity 2 of the dock 1 are cleaned.
The rule refers to the volume when any height is obtained through geometric relations, such as conical shape, prismatic shape and the like. In this embodiment, the housing 2 has a rectangular parallelepiped shape. The vessel 6 is placed in the cavity 2 through the docking blocks and the skid 3. The bottom wall and the side wall of the cavity 2 are provided with a plurality of liquid inlets. The liquid inlet is communicated with a liquid source through a liquid inlet channel. The liquid inlet is provided with a flowmeter 4 and a valve 5. The flow meter 4 can effectively measure the inflow or outflow of water. The liquid source is a water source.
Each side wall of the cavity 2 is provided with a height indicating part, and the height indicating part is provided with different scale values corresponding to different sizes of the liquid level height and used for indicating the liquid level height on the corresponding side wall. The scale value precision of the height indicating part is at least centimeter. In this embodiment, the scale value accuracy of the height indicator is at least millimeters.
And step two, measuring the density of the water body in the water source, wherein the density of the water body is less than the density of the docking block and the skid 3. And calculating the bottom area of the cavity 2, and determining the volume of a docking block and a skid 3 arranged at the bottom of the cavity 2 of the dock 1.
And step three, opening all valves 5, and pumping the water body in the water source into the cavity 2 through a water pump.
And step four, when the ship 6 completely floats, all valves 5 are closed without keeping the same height of the water surface inside and outside the dock, so that no water body enters or exits the dock 1, and the total volume of the inlet liquid is recorded according to the flow meter 4.
And step five, standing for a period of time to keep the water surface in a calm state, and acquiring the draft height in the accommodating cavity 2.
The draft height calculation method comprises the following steps: the liquid level of the water surface in the chamber 2 on each side wall is read and the average of all liquid level levels is calculated as the draft level in the chamber 2.
And sixthly, calculating according to the bottom area, the draft height, the volume of the docking block and the skid 3 and the total volume of the liquid inlet to obtain the weight of the ship 6.
The calculation formula of the weight of the ship 6 is as follows: m = ρ (S × h-V) 1 -V 2 ). During calculation, the units of all variables are unified. Wherein M is the weight of the ship 6, rho is the liquid density, h is the draft height, V 1 Is the total volume of feed liquor, V 2 The total volume of the docking block and the skid 3.
The ship weight calculation method is mainly divided into two layers, wherein the first layer requires that a dock 1 is a regular dock 1, and the volume of any height can be solved through a geometric relationship; a counter with enough flow needs to be arranged in the dock 1, so that the water flow in and out of the dock 1 can be effectively measured; the peripheral walls of the dock 1 are all carved with high-precision water level scale lines, the precision is at least centimeter or millimeter, and the draught position can be effectively read. The second layer is to calculate the weight of the ship 6, the volume of the dock 1 occupied by the inflow water in the dock 1 in the completely floating state of the ship 6 is calculated by measuring the volume of the flow of the still water, the volumes of the docking block, the skid and other members are removed, and the real weight of the ship 6 can be calculated based on the buoyancy principle.
In summary, the specific application examples of the present invention do not limit the scope of the present invention, and all technical solutions adopting equivalent substitution fall within the scope of the present invention.
Claims (8)
1. A ship weight calculation method based on dock inflow is characterized by comprising the following steps:
preparing a cavity with a closed lower end, wherein a cavity is formed in the cavity, the cavity is communicated with a liquid source through a liquid inlet channel, a flowmeter and a valve are arranged on the liquid inlet channel, and a ship is placed in the cavity;
step two, obtaining the density of the liquid source and calculating the bottom area of the cavity;
step three, opening the valve and sending the liquid in the liquid source into the cavity;
step four, after the ship floats, closing the valve, and recording the total volume of the feed liquid according to the flowmeter;
step five, after standing for preset time, acquiring the draft height in the containing cavity; and
and sixthly, calculating according to the bottom area, the draft height and the total volume of the liquid inlet to obtain the weight of the ship.
2. The method of claim 1, wherein each side wall of the chamber is provided with a height indicator having different scale values corresponding to different sizes of the liquid level for indicating the liquid level on the corresponding side wall, and the step four comprises reading the liquid level on each side wall and calculating an average of all the liquid levels as the draft height in the chamber.
3. The method of claim 2, wherein the height indicator is at least as accurate as a centimeter in dimension.
4. The method of claim 1, wherein the cavity is rectangular.
5. The method of claim 4, wherein the cavity is a dock.
6. The method according to claim 5, wherein the density of a docking block and a skid arranged at the bottom of the dock are both greater than the density of the liquid, the method further comprises a second step of determining the volume of the docking block and the skid, and in a sixth step of calculating the weight of the ship according to the floor area, the draft height, the volume of the docking block and the skid and the total volume of the inlet liquid.
7. The method of claim 6, wherein the weight of the vessel is calculated as M = ρ (S × h-V) 1 -V 2 ) Wherein M is the ship weight, ρ is the liquid density, h is the draft height, V 1 Is the total volume of the feed liquid, V 2 The volume of the docking block and the skid is shown.
8. The method as claimed in claim 5, wherein the sidewalls and bottom wall of the dock are provided with a plurality of liquid inlets, the liquid inlets are connected to the liquid source through liquid inlet channels, and each liquid inlet is provided with the flow meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210562133.2A CN114964444A (en) | 2022-05-23 | 2022-05-23 | Ship weight calculation method based on dock inflow |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210562133.2A CN114964444A (en) | 2022-05-23 | 2022-05-23 | Ship weight calculation method based on dock inflow |
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| CN114964444A true CN114964444A (en) | 2022-08-30 |
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| CN202210562133.2A Pending CN114964444A (en) | 2022-05-23 | 2022-05-23 | Ship weight calculation method based on dock inflow |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB561388A (en) * | 1942-12-25 | 1944-05-17 | Harold Cayzer Leech | An improved weighing device |
| CH381876A (en) * | 1961-02-14 | 1964-09-15 | Ertl Rudolf | Household scales |
| FR2656922A1 (en) * | 1990-01-11 | 1991-07-12 | Lecoffre Yves | Hydrostatic device intended to measure weights |
| US6003366A (en) * | 1997-12-09 | 1999-12-21 | Mcgookin; Hugh R. | Liquid level indicating method and system |
| DE10257969A1 (en) * | 2002-12-12 | 2004-07-01 | Pütz, Daniel | Floating, very fine weighing scale has a float with a lead weight at its bottom to improve stability against tilting and a conical measurement tube and scale to improve measurement accuracy for low weights |
| CN101216338A (en) * | 2007-12-27 | 2008-07-09 | 武汉理工大学 | Ship displacement measuring apparatus and its measurement method |
| KR20110038226A (en) * | 2009-10-08 | 2011-04-14 | 대우조선해양 주식회사 | Method for performing light weight in a dock(on the ground) before launching a ship |
| CN102353956A (en) * | 2011-07-05 | 2012-02-15 | 重庆交通大学 | Device and method for measuring water draught of inland ship based on sonar synchronous scanning |
| KR101255767B1 (en) * | 2011-10-17 | 2013-04-17 | 대우조선해양 주식회사 | Draft measuring system for vessels |
| CN104764516A (en) * | 2015-03-30 | 2015-07-08 | 广西大学 | Multifunctional measuring tool |
-
2022
- 2022-05-23 CN CN202210562133.2A patent/CN114964444A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB561388A (en) * | 1942-12-25 | 1944-05-17 | Harold Cayzer Leech | An improved weighing device |
| CH381876A (en) * | 1961-02-14 | 1964-09-15 | Ertl Rudolf | Household scales |
| FR2656922A1 (en) * | 1990-01-11 | 1991-07-12 | Lecoffre Yves | Hydrostatic device intended to measure weights |
| US6003366A (en) * | 1997-12-09 | 1999-12-21 | Mcgookin; Hugh R. | Liquid level indicating method and system |
| DE10257969A1 (en) * | 2002-12-12 | 2004-07-01 | Pütz, Daniel | Floating, very fine weighing scale has a float with a lead weight at its bottom to improve stability against tilting and a conical measurement tube and scale to improve measurement accuracy for low weights |
| CN101216338A (en) * | 2007-12-27 | 2008-07-09 | 武汉理工大学 | Ship displacement measuring apparatus and its measurement method |
| KR20110038226A (en) * | 2009-10-08 | 2011-04-14 | 대우조선해양 주식회사 | Method for performing light weight in a dock(on the ground) before launching a ship |
| CN102353956A (en) * | 2011-07-05 | 2012-02-15 | 重庆交通大学 | Device and method for measuring water draught of inland ship based on sonar synchronous scanning |
| KR101255767B1 (en) * | 2011-10-17 | 2013-04-17 | 대우조선해양 주식회사 | Draft measuring system for vessels |
| CN104764516A (en) * | 2015-03-30 | 2015-07-08 | 广西大学 | Multifunctional measuring tool |
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| AARON工程师: "军舰、轮船的排水量是如何测量的？", pages 1 - 2, Retrieved from the Internet <URL:https://zhihu.com/question/21359900> * |
| 陈文炜;俞汲;徐杰;姜灿洪;陈炼;: "一种船舶吃水测量***", 中国造船, no. 01 * |
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