Water surface ship inclination and still water rolling test measurement method

Abstract

The invention relates to the technical field of ship test measurement, in particular to an automatic water surface ship inclination and still water rolling test measurement method. A camera integrated with an image recognition function is carried on the unmanned ship to be matched with a water level monitor to obtain the draught of the ship in the inclination test, meanwhile, a weight (weight for the inclination test) with the known weight is moved on the ship to enable the ship to generate a certain heeling angle, and the heeling angle of the ship body is automatically obtained through a ship body attitude measurement module; then through a data processing module, the gravity center position and the displacement of the ship can be reversely deduced based on the ship statics principle by using the measured draft, the heeling angle and the torque of the moving heavy object; compared with the prior art, the method has the advantages that the automation degree is high, data reading is more accurate, the time consistency of data is higher, human errors can be effectively avoided, the test risk is reduced, and the test efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of ship test measurement, and in particular to an automated surface ship tilt and still water roll test measurement method. Background Art

[0002] At present, the ship tilt test and still water rolling test can be carried out according to the current relevant industry specifications. When reading the ship's draft during the test, the reading personnel must go around the ship to be tested, especially when the ship to be tested is in open waters, the personnel must go around in other boats. If the reading does not meet the test requirements, it must be read again after adjustment. Moreover, each reading is read by naked eyes, and the human and material resources and reading errors are large; at the same time, there are certain safety risks when the test personnel transfer and read. During the test, when the test ship tilts under the specified working conditions, the data reflecting the degree of tilt is read through a fixed test device (generally a U-tube device or a pendulum device). In case of cold or hot weather, it will seriously affect the experimenter's transcription and recording of data, and the availability of the data and the test results must be determined through strict and long-term calculations; at the same time, manual reading has high requirements for the test personnel, and the readings between different test personnel vary greatly. Therefore, the traditional tilt test method is time-consuming and labor-intensive, inefficient, poor in working environment, and has certain safety risks. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for measuring the tilt and still water roll tests of surface ships, which can realize automated tilt and still water roll test processes, greatly reduce the manpower requirements and ability requirements of test participants, effectively eliminate human errors, reduce the complexity of the ship tilt and still water roll test processes, shorten the test time, and improve the test efficiency and the accuracy of the test results.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A method for measuring the tilt and still water rolling test of a surface ship comprises the following steps:

[0006] S1, draught acquisition: The unmanned boat is equipped with a camera for close observation, and combined with the measurement data of the water level measurement module installed on the edge of the ship deck, the ship's draught data during the test is obtained in real time;

[0007] S2, wind speed acquisition: The wind speed data during the test is acquired in real time through the wind speed measurement module installed on the top of the ship;

[0008] S3, water density acquisition: directly obtain the water density data of the ship test area through a densitometer;

[0009] S4, transportation of test weights and acquisition of ship attitude: the test weights are hoisted to the ship deck by the shore crane in the order recorded in the preset test outline, and the ship's heel angle data during the test is obtained in real time by the ship attitude measurement module;

[0010] S5, data receiving and processing process: the ship's draft data, wind speed data, water density data, and heel angle data are all sent to the data receiving module in real time, and transmitted to the data processing module in real time through the data receiving module; the data processing module processes the data transmitted by the data receiving module in real time, and obtains the processed ship's draft measurement value, wind speed measurement value, water density measurement value, and heel angle measurement value respectively;

[0011] S6, test measurement result output: the data processing module inputs the processed measurement values ​​into a preset test calculation program, and calculates the displacement and center of gravity position of the ship during the test through basic statics principles.

[0012] Furthermore, the obtaining of the ship draft data during the test process includes:

[0013] 1) The camera carried by the remote-controlled unmanned boat is used for close observation, and the draft video recorded by the unmanned boat is transmitted to the data receiving module through the image transmission module on the unmanned boat, and the ship draft data H1 is obtained by the data processing module using image recognition technology;

[0014] 2) The height of the ship at the corresponding draft mark is obtained by the water level measurement module installed on the edge of the deck, and the height data of different positions is transmitted to the data receiving module through the data transmission module of the water level measurement module, and the data processing module obtains the ship draft data H2 through geometric space conversion;

[0015] 3) Determine the final ship draft data H = (H1 + H2) / 2.

[0016] Furthermore, the wind speed data during the test is acquired by a wind speed measuring module installed on the top of the ship, and the wind speed data is transmitted to the data receiving module through a data transmission module of the wind speed measuring module.

[0017] Furthermore, the wind speed data acquired by the wind speed measurement module are all marked with corresponding data acquisition time, and the wind speed measurement value obtained by the data processing module is specifically the average value of the wind speed data within a preset time period.

[0018] Furthermore, the weight of the test weights and the position of the weights hoisted onto the ship deck are selected according to relevant standards for ship inclination tests.

[0019] Furthermore, the bow and stern of the ship are both equipped with hull attitude measurement modules, which obtain the ship's roll angle data in real time through the internal high-precision inertial navigation module, and transmit the roll angle data to the data processing module for processing through the data receiving module.

[0020] Furthermore, the heel angle measurement value obtained by the data processing module is specifically an average of the heel angle data within a preset time period, and the heel angle data selected from the front and rear hull attitude measurement modules are consistent with the wind speed data in time.

[0021] Furthermore, the data processing module outputs the measured values ​​of the heel angle within a preset time period as a time history curve of the hull rolling motion, and performs Fourier transform on the time history curve of the hull rolling motion or selects the motion peak points on the curve to obtain the rolling period of the ship's still water rolling test.

[0022] Compared with the prior art, the present invention has the following main advantages:

[0023] The present invention obtains the draft of the ship during the tilt test by installing a camera with an integrated image recognition function on the unmanned boat in conjunction with a water level monitor, and at the same time, by moving a weight of known weight on the ship (a weight for the tilt test) to make the ship produce a certain heel angle, and automatically obtains the hull heel angle through a hull attitude measurement module; then, through a data processing module, the measured draft, heel angle and torque of the moving weight are used to infer the center of gravity position and displacement of the ship based on the principle of ship statics; compared with the existing technology, the method has a high degree of automation, more accurate data reading, higher data consistency in time, can effectively avoid human errors, reduce test risks, and greatly improve test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the composition and workflow of the test measurement system in an embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the on-site layout of the test measurement system in an embodiment of the present invention.

[0026] In the figure: 1-hull attitude measurement module, 2-unmanned boat, 3-wind speed measurement module, 4-data receiving module, 5-data processing module, 6-weight for tilt test, 7-water level measurement module, 8-crane, 9-densitometer. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0029] Embodiment 1: This embodiment provides a method for measuring the tilt and still water rolling test of a surface ship, which mainly includes the following steps:

[0030] S1, draught acquisition: The unmanned boat is equipped with a camera for close observation, and combined with the measurement data of the water level measurement module installed on the edge of the ship deck, the ship's draught data during the test is obtained in real time;

[0031] S2, wind speed acquisition: The wind speed data during the test is acquired in real time through the wind speed measurement module installed on the top of the ship;

[0032] S3, water density acquisition: directly obtain the water density data of the ship test area through a densitometer;

[0033] S4, transportation of test weights and acquisition of ship attitude: the test weights are hoisted to the ship deck by the shore crane in the order recorded in the preset test outline, and the ship's heel angle data during the test is obtained in real time by the ship attitude measurement module;

[0034] S5, data receiving and processing process: the ship's draft data, wind speed data, water density data, and heel angle data are all sent to the data receiving module in real time, and transmitted to the data processing module in real time through the data receiving module; the data processing module processes the data transmitted by the data receiving module in real time, and obtains the processed ship's draft measurement value, wind speed measurement value, water density measurement value, and heel angle measurement value respectively;

[0035] S6, test measurement result output: the data processing module inputs the processed measurement values ​​into a preset test calculation program, and calculates the displacement and center of gravity position of the ship during the test through basic statics principles.

[0036] Furthermore, the obtaining of the ship draft data during the test process includes:

[0037] 1) The camera carried by the remote-controlled unmanned boat is used for close observation, and the draft video recorded by the unmanned boat is transmitted to the data receiving module through the image transmission module on the unmanned boat, and the ship draft data H1 is obtained by the data processing module using image recognition technology;

[0038] 2) The height of the ship at the corresponding draft mark is obtained by the water level measurement module installed on the edge of the deck, and the height data of different positions is transmitted to the data receiving module through the data transmission module of the water level measurement module, and the data processing module obtains the ship draft data H2 through geometric space conversion;

[0039] 3) Determine the final ship draft data H = (H1 + H2) / 2.

[0040] Furthermore, the wind speed data during the test is acquired by a wind speed measuring module installed on the top of the ship, and the wind speed data is transmitted to the data receiving module through a data transmission module of the wind speed measuring module.

[0041] Furthermore, the wind speed data acquired by the wind speed measurement module are all marked with corresponding data acquisition time, and the wind speed measurement value obtained by the data processing module is specifically the average value of the wind speed data within a preset time period.

[0042] Furthermore, the weight of the test weights and the position of the weights hoisted onto the ship deck are selected according to relevant standards for ship inclination tests.

[0043] Furthermore, the bow and stern of the ship are both equipped with hull attitude measurement modules, which obtain the ship's roll angle data in real time through the internal high-precision inertial navigation module, and transmit the roll angle data to the data processing module for processing through the data receiving module.

[0044] Furthermore, the heel angle measurement value obtained by the data processing module is specifically an average of the heel angle data within a preset time period, and the heel angle data selected from the front and rear hull attitude measurement modules are consistent with the wind speed data in time.

[0045] Furthermore, the data processing module outputs the measured values ​​of the heel angle within a preset time period as a time history curve of the hull rolling motion, and performs Fourier transform on the time history curve of the hull rolling motion or selects the motion peak points on the curve to obtain the rolling period of the ship's still water rolling test.

[0046] Embodiment 2: This embodiment provides a method for measuring the tilt and hydrostatic roll test of a surface ship, wherein the test weights are hoisted by a shore crane in the order recorded in a preset test outline.

[0047] Furthermore, the weight of the test weight is selected according to relevant standards for ship inclination tests.

[0048] Further, the water density reading is obtained by a densitometer, and the water density during the test is input into the tilt test data processing module.

[0049] Furthermore, during the test, the wind speed is measured by the wind speed measuring module, and the wind speed is transmitted in real time to the tilt test data processing module through the data receiving module by means of the data transmission function of the wind speed measuring module.

[0050] Furthermore, the draft of the ship during the test can be obtained by:

[0051] 1) Use a remote-controlled unmanned boat equipped with a camera to conduct close observation, transmit the draft video recorded by the unmanned boat to the data receiving module through the image transmission module on the unmanned boat, and obtain the draft measurement value H1 through the tilt test data processing module using image recognition technology;

[0052] 2) The height of the corresponding draft mark is obtained by installing a water level monitoring module on the edge of the deck, and the height data of different positions are transmitted to the data receiving module through the data transmission module of the water level monitoring module, and the draft measurement value H2 is obtained by geometric space conversion using the tilt test data processing module;

[0053] 3) Determine the final draft H = (H1 + H2) / 2.

[0054] Furthermore, the heel angle caused by the lifting of the weight for the tilt test during the test is measured by the hull attitude measurement module. The hull attitude measurement module mainly measures in real time through the high-precision inertial navigation module and sends the heel data to the data receiving module in real time through the data transmission module it carries, and further processes it using the tilt test data processing module. Usually, two tilt test hull attitude measurement modules are arranged at the bow and stern.

[0055] Furthermore, the final draft value at each draft mark is an average of the draft data obtained by the sensor over a period of time.

[0056] Furthermore, the measured instantaneous wind speed values ​​are all marked with the corresponding measurement time.

[0057] Furthermore, the hull heel value is the average of the hull heel data within a period of time, and the data selected from the front and rear hull attitude measurement modules should be kept consistent in time. At the same time, the wind speed range within the time period should be recorded and filled in the test book.

[0058] Furthermore, the data receiving module can wirelessly receive data from other data transmission modules and image transmission modules in real time, and transmit the data to the tilt test data processing module in real time.

[0059] Furthermore, the data processing module can receive data from the transmission module in real time, and process the data in real time, promptly giving the processing results of the draft, wind speed, and heel angle, and inputting the processing result data into a preset tilt test calculation program, and calculating the displacement and center of gravity position of the ship during the tilt test through basic statics principles; the data processing module can specifically be a PC or an industrial computer.

[0060] Furthermore, when conducting a still water rolling test, the rolling period can be obtained by Fourier transforming or selecting the motion peak point from the time history curve of the hull rolling motion within a period of time measured and recorded by the hull attitude measurement module.

[0061] Furthermore, the test personnel do not need to take visual readings by riding in a small boat.

[0062] Furthermore, the test personnel do not need to be on board to take heel angle readings.

[0063] Specifically, Figures 1-2 As shown, the test measurement system used in this application includes: a hull attitude measurement module 1, an unmanned boat 2, a wind speed measurement module 3, a data receiving module 4, a data processing module 5, a weight for tilt test 6, a water level measurement module 7, a crane 8, and a density meter 9.

[0064] Furthermore, the draft reading is obtained by the densitometer 9 , and the water density during the test is filled into the tilt test data processing module 5 .

[0065] Furthermore, during the test, the wind speed is measured by the wind speed measuring module 3 , and the wind speed is transmitted in real time to the tilt test data processing module 5 through the data receiving module 4 by means of the data transmission function of the wind speed measuring module 3 .

[0066] Furthermore, during the test, the draft of the ship is observed by a camera mounted on the remote-controlled unmanned boat 2, and the draft video recorded by the unmanned boat 2 is transmitted to the data receiving module 4 through the image transmission module on the unmanned boat 2, and the accurate draft is further obtained by using the image recognition technology through the tilt test data processing module 5. The final draft value at each draft mark should be the average of the draft data obtained by the unmanned boat 2 over a period of time.

[0067] Furthermore, the test weight 6 is lifted by the shore crane 8 in the order specified in the test outline. During the test, the heel angle caused by the lifting of the tilt test weight 6 is measured by the hull attitude measurement module 1. The hull attitude measurement module 1 mainly uses the high-precision inertial navigation module to measure in real time and sends the heel data to the data receiving module 4 in real time through the data transmission module it carries, and further uses the tilt test data processing module 5 for processing. Usually, two tilt test hull attitude measurement modules 1 are arranged at the bow and stern. The hull heel angle should be the average of the data over a period of time. And the data selected from the front and rear hull attitude measurement modules 1 should be consistent in time. The wind speed range within the time period should be recorded and filled in the test book.

[0068] Furthermore, the data receiving module 4 can wirelessly receive data from other data transmission modules and image transmission modules in real time, and transmit the data to the tilt test data processing module 5 in real time.

[0069] Furthermore, the data processing module 5 can receive the data from the transmission module 4 in real time, process the data in real time, give the processing results of the draft, wind speed and heel angle in time, input the data into the tilt test calculation program, and calculate the displacement and center of gravity position of the ship during the tilt test through the basic statics principle. The data processing module 5 is specifically a PC or an industrial computer.

[0070] Furthermore, all parts involved in this application that are not described in detail are the same as the prior art or are implemented using the prior art.

[0071] In summary:

[0072] The present invention obtains the draft of the ship during the tilt test by installing a camera with an integrated image recognition function on the unmanned boat in conjunction with a water level monitor, and at the same time, by moving a weight of known weight on the ship (a weight for the tilt test) to make the ship produce a certain heel angle, and automatically obtains the hull heel angle through a hull attitude measurement module; then, through a data processing module, the measured draft, heel angle and torque of the moving weight are used to infer the center of gravity position and displacement of the ship based on the principle of ship statics; compared with the existing technology, the method has a high degree of automation, more accurate data reading, higher data consistency in time, can effectively avoid human errors, reduce test risks, and greatly improve test efficiency.

[0073] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for measuring the tilt and still water rolling test of a surface ship, characterized in that: The steps include: S1, draught acquisition: The unmanned boat is equipped with a camera for close observation, and combined with the measurement data of the water level measurement module installed on the edge of the ship deck, the ship's draught data during the test is obtained in real time; S2, wind speed acquisition: The wind speed data during the test is acquired in real time through the wind speed measurement module installed on the top of the ship; S3, water density acquisition: directly obtain the water density data of the ship test area through a densitometer; S4, transportation of test weights and acquisition of ship attitude: the test weights are hoisted to the ship deck by the shore crane in the order recorded in the preset test outline, and the ship's heel angle data during the test is obtained in real time by the ship attitude measurement module; S5, data receiving and processing process: the ship's draft data, wind speed data, water density data, and heel angle data are all sent to the data receiving module in real time, and transmitted to the data processing module in real time through the data receiving module; the data processing module processes the data transmitted by the data receiving module in real time, and obtains the processed ship's draft measurement value, wind speed measurement value, water density measurement value, and heel angle measurement value respectively; S6, test measurement result output: the data processing module inputs the processed measurement values ​​into a preset test calculation program, and calculates the displacement and center of gravity position of the ship during the test through basic statics principles.

2. A method for measuring the tilt and hydrostatic rolling test of a surface ship according to claim 1, characterized in that: The obtaining of the ship draft data during the test process includes: 1) The camera carried by the remote-controlled unmanned boat is used for close observation, and the draft video recorded by the unmanned boat is transmitted to the data receiving module through the image transmission module on the unmanned boat, and the ship draft data H1 is obtained by the data processing module using image recognition technology; 2) The height of the ship at the corresponding draft mark is obtained by the water level measurement module installed on the edge of the deck, and the height data of different positions is transmitted to the data receiving module through the data transmission module of the water level measurement module, and the data processing module obtains the ship draft data H2 through geometric space conversion; 3) Determine the final ship draft data H = (H1 + H2) / 2.

3. A method for measuring the tilt and still water rolling test of a surface ship according to claim 1, characterized in that: The wind speed data during the test is acquired by a wind speed measuring module installed on the top of the ship, and the wind speed data is transmitted to the data receiving module through the data transmission module of the wind speed measuring module.

4. A method for measuring the tilt and still water rolling test of a surface ship according to claim 3, characterized in that: The wind speed data acquired by the wind speed measurement module are all marked with the corresponding data acquisition time, and the wind speed measurement value obtained by the data processing module is specifically the average value of the wind speed data within a preset time period.

5. A method for measuring the tilt and still water rolling test of a surface ship according to claim 1, characterized in that: The weight of the test weight and the position of the weight when hoisted onto the ship deck are selected according to the relevant standards for ship inclination test.

6. A method for measuring the tilt and still water rolling test of a surface ship according to claim 4, characterized in that: The bow and stern of the ship are both equipped with a hull attitude measurement module, which obtains the ship's roll angle data in real time through an internal high-precision inertial navigation module, and transmits the roll angle data to the data processing module for processing through the data receiving module.

7. A surface ship inclination and still water roll test measurement method according to claim 6, characterized in that the roll angle measurement value obtained by the data processing module is specifically the average roll angle data within a preset time period, and the roll angle data selected from the front and rear hull attitude measurement modules are consistent in time with the wind speed data.

8. A method for measuring the tilt and still water rolling test of a surface ship according to claim 1, characterized in that: The data processing module outputs the measured values ​​of the heel angle within a preset time period as a hull rolling motion history curve, and performs Fourier transform on the hull rolling motion history curve or selects the motion peak point on the curve to obtain the rolling period of the ship's still water rolling test.

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