A method of measuring the slamming pressure experienced by a ship when sailing in sea waves

Abstract

The present application relates to a kind of methods for measuring the slamming pressure that ship is subjected to when sailing in sea wave, the ship is full ship, also include pressure sensor, signal acquisition module and signal processing module;The method for measuring slamming pressure includes the following steps: calibrating pressure sensor;Pressure sensor is installed in the position of the measured slamming pressure of ship outer plate;Pressure sensor is connected with signal acquisition module;During the sailing of the ship in sea wave, sea wave impact pressure sensor makes it subjected to slamming pressure, signal acquisition module acquires measurement signal and transmits to signal processing module;Signal processing module obtains the time history data of slamming pressure after processing measurement signal. Thus, the slamming pressure that the ship is subjected to is accurately measured in actual sea wave, so that the measurement of slamming pressure is more suitable for full ship design.

Description

Technical Field

[0001] This invention relates to the field of slamming pressure testing and measurement technology, and in particular to a method for measuring the slamming pressure experienced by a ship while sailing in ocean waves. Background Technology

[0002] When a ship navigates in rough seas, the large relative motion between the hull and the waves causes the hull, initially submerged, to emerge above the waterline. During the subsequent submersion, the hull and waves violently impact each other, with the waves also forcefully striking the flared bow area. This impact phenomenon is called slamming. Severe slamming poses a serious threat to the overall and local structural strength of the hull. Slamming is a localized, instantaneous impact problem, often accompanied by rapid changes in the wetted surface of the hull and highly nonlinear phenomena such as liquid splashing. The slamming problem has always been a hot topic and a challenge in the field of shipbuilding and ocean engineering. Currently, research on this problem worldwide mainly includes two methods: numerical calculation and model testing.

[0003] Numerical calculation methods mainly include analytical methods, boundary element methods, finite element methods, CFD methods, and SPH methods, but each method has certain limitations and cannot meet the engineering needs of reasonably determining the design value of hull slamming pressure.

[0004] Model tests include drop tests and seakeeping tank tests. Drop tests are mostly conducted in still water, which differs fundamentally from actual ocean wave surfaces. While seakeeping tank tests can measure ship slamming pressure in waves, the wave types used in these tests are mostly two-dimensional long-crest waves, whereas actual ocean waves are three-dimensional short-crest waves. The slamming pressure characteristics of ships in long-crest waves and short-crest waves are significantly different, especially for multihull ships. Furthermore, slamming pressure exhibits a certain degree of scale effect. How to make slamming pressure measurements more applicable to actual ship design remains a topic worthy of in-depth research. Summary of the Invention

[0005] In response to the shortcomings of the existing testing techniques, the applicant provides a method for measuring the slamming pressure experienced by a ship while sailing in ocean waves, thereby enabling accurate measurement of the slamming pressure experienced by the ship in actual ocean waves, making the measurement of slamming pressure more applicable to actual ship design.

[0006] The technical solution adopted in this invention is as follows:

[0007] A method for measuring the impact pressure experienced by a ship while sailing in ocean waves, wherein the ship is a real ship, and further includes a pressure sensor, a signal acquisition module and a signal processing module;

[0008] The method for measuring impact pressure includes the following steps:

[0009] S1. Calibrate the pressure sensor;

[0010] S2. Install the pressure sensor at the location of the impact pressure to be measured on the outer plating of the hull.

[0011] S3. Connect the pressure sensor to the signal acquisition module;

[0012] S4. During the ship's navigation in the waves, the wave impact pressure sensor is subjected to the impact pressure, and the signal acquisition module collects the measurement signal and transmits it to the signal processing module.

[0013] S5, the signal processing module will process the measurement signal to obtain the time history data of the impact pressure.

[0014] Its further technical solution lies in:

[0015] There are multiple pressure sensors.

[0016] The pressure sensor consists of a ring-shaped base and a thin-film pressure plate.

[0017] The pressure plate is detachably installed on the outer end face of the base, and the base is sealed to the outer plate of the hull.

[0018] One side of the pressure plate is subjected to the impact of sea waves, and a strain sensor is installed at the center of the other side of the pressure plate. The strain sensor is used to measure the strain of the pressure plate under the impact of sea waves, and the strain signal output by the strain sensor is the measurement signal.

[0019] In step five, the time-history data expression for the slamming pressure is:

[0020] p(t)=δ·ε(t) (a)

[0021] In formula (a), p(t) is the impact pressure duration, ε(t) is the strain signal duration, and δ is the pressure sensor coefficient.

[0022] The pressure plate is a steel plate, and the periphery of the pressure plate is connected to the outer end face of the base by a first bolt.

[0023] The thickness of the pressure plate is 1mm to 3mm.

[0024] When calibrating a pressure sensor, the steps include:

[0025] S11. Place the assembled strain sensor, pressure plate and base on the workbench, with the strain sensor located on the lower surface of the pressure plate, and connect the strain sensor to the signal acquisition module.

[0026] S12. A loading cylinder is sealed and installed on the upper surface of the pressure plate. The inner wall profile of the loading cylinder is larger than the inner ring profile of the base, so that the inner wall of the loading cylinder and the upper surface of the pressure plate form a water storage cavity.

[0027] S13. Add the same amount of water into the water storage chamber one by one. Each time the water level rises by Δh, record the change in the strain sensor signal Δε each time.

[0028] S14. Gradually reduce the same amount of water into the water storage chamber, with the water level decreasing by Δh each time, and record the change in the strain sensor signal Δε each time.

[0029] S15. Calculate the pressure sensor coefficient δ;

[0030]

[0031] In formula (b), δ is the pressure sensor coefficient, ρ is the water density, g is the gravitational acceleration, and Δh is the change in water level during the calibration process. This represents the average change in strain signal Δε after each addition or extraction of water during the calibration process.

[0032] The strain sensor is a strain gauge.

[0033] The signal acquisition module includes a dynamic strain gauge.

[0034] A through hole is provided on the outer plate of the hull. The base is sealed to the outer plate of the hull by a second bolt and a gasket. The diameter of the through hole is equal to the outer diameter of the outer end face of the base.

[0035] The outer hull plate has no holes, and the base is attached to the outer surface of the outer hull plate.

[0036] The beneficial effects of this invention are as follows:

[0037] This invention features a compact and reasonable structure and is easy to operate. After the pressure sensor is calibrated, it is installed at the location of the slamming pressure to be measured on the actual ship. The slamming pressure is measured in real time during the ship's navigation, thereby accurately measuring the slamming pressure experienced by the ship in actual sea waves, making the measurement of slamming pressure more applicable to actual ship design.

[0038] Furthermore, the present invention also has the following advantages:

[0039] (1) By using an annular base as the mounting structure of the pressure sensor, a pressure plate that withstands the impact of waves is installed on the outer end face of the annular base, and a strain sensor is installed on the inner center of the pressure plate. A slamming pressure sensor suitable for real ships is made, which converts the deformation of the pressure plate into pressure, making the measured impact pressure more macroscopic and reflecting the actual wave load. At the same time, the structure is simple and the test cost is low.

[0040] (2) The pressure sensor can be installed in a flexible manner, either by drilling holes on the outer plate of the ship or by directly installing it on the outer plate of the ship. At the same time, the pressure plate can be replaced at any time according to the actual situation. It is easy to install, highly applicable, and has a wide range of applications.

[0041] (3) The pressure sensor can be installed on the ship for a long time. If the pressure sensor is damaged during use, it can be easily and quickly disassembled and replaced.

[0042] (4) The outer end face of the ring-shaped base is used as the mounting support surface of the pressure plate. At the same time, when the pressure sensor is calibrated, this end face is used as the support surface of the loading cylinder. Different loads can be applied to the pressure plate by simply changing the height of the water level in the loading cylinder to calibrate the pressure sensor. This calibration device has a simple structure, excellent stability and reliability, and strong operability. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the pressure sensor of the present invention.

[0044] Figure 2 This is a schematic diagram of the pressure sensor calibration structure of the present invention.

[0045] Figure 3 This is a schematic diagram of the structure of the pressure plate of the present invention.

[0046] Figure 4 This is a schematic diagram of the structure of the gasket of the present invention.

[0047] Figure 5 This is a schematic diagram of the structure of the base of the present invention.

[0048] Figure 6 This is a cross-sectional view of the base of the present invention.

[0049] The components are: 1. Strain sensor; 2. Pressure plate; 20. First mounting hole; 21. First bolt; 3. Base; 31. Second bolt; 310. Second mounting hole; 320. Third mounting hole; 4. Gasket; 40. Perforation; 5. Outer plate of the hull; 6. Loading cylinder. Detailed Implementation

[0050] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0051] Compared to testing wave loads in a test tank using ship models, directly measuring slamming pressure on a real ship in actual ocean waves is the most direct and reliable method for studying ship slamming problems. However, due to the lack of reliable measurement methods in this field, this method is not feasible.

[0052] To address this issue, this embodiment provides a method for accurately measuring the slamming pressure experienced by a ship in actual ocean waves, providing important and reliable data support for hull structure design.

[0053] The method for measuring the slamming pressure experienced by a ship when sailing in ocean waves in this embodiment, where the ship is a real ship, also includes a pressure sensor, a signal acquisition module and a signal processing module.

[0054] The method for measuring impact pressure includes the following steps:

[0055] S1. Calibrate the pressure sensor;

[0056] S2. Install the pressure sensor at the location of the impact pressure to be measured on the outer plating 5 of the hull.

[0057] S3. Connect the pressure sensor to the signal acquisition module;

[0058] S4. When a ship is sailing in the waves, the wave impact pressure sensor is subjected to the impact pressure. The signal acquisition module collects the measurement signal and transmits it to the signal processing module.

[0059] S5, the signal processing module will process the measurement signal to obtain the time history data of the impact pressure.

[0060] Specifically, the actual vessel can be a test vessel or a vessel in daily operation; the location to be measured for the slamming pressure can be the bow flare area or other locations where the slamming pressure needs to be measured. Depending on the specific location and area, multiple pressure sensors can be arranged and installed; the pressure sensors are calibrated before measuring the slamming pressure to make the measured slamming pressure more accurate and reliable; during the vessel's navigation, the pressure sensors measure more measurement signals and provide real-time feedback on the slamming pressure experienced by the vessel; the signal processing module is usually the test data processing equipment, such as a computer.

[0061] After the pressure sensor is calibrated, it is installed at the location of the slamming pressure to be measured on the actual ship. The slamming pressure is measured in real time during the ship's navigation, so as to accurately measure the slamming pressure on the ship in actual sea waves, making the measurement of slamming pressure more applicable to actual ship design.

[0062] Example 1:

[0063] This embodiment uses a pressure sensor that is more suitable for actual ships to conduct in-depth research and measurement of ship slamming pressure.

[0064] like Figures 1-6As shown, the structure of a single pressure sensor includes a ring-shaped base 3 and a thin-plate pressure plate 2. The pressure plate 2 is detachably installed on the outer end face of the base 3, and the base 3 is sealed to the outer plate 5 of the ship. One side of the pressure plate 2 is subjected to the impact of sea waves, and a strain sensor 1 is installed at the center of the other side of the pressure plate 2. The strain sensor 1 is used to measure the strain generated by the pressure plate 2 under the impact of sea waves, and the strain signal output by the strain sensor 1 is the measurement signal.

[0065] Specifically, if the outer plate 5 has mounting holes, the base 3 can be installed inside the holes; if the outer plate 5 does not have mounting holes, the base 3 can be directly glued to the outer surface of the outer plate with strong adhesive. The pressure plate 2 is installed on the outer end face of the base 3 to cover the end face. The pressure plate 2 replaces the original outer plate 5. In both cases, the outer surface of the pressure plate 2 bears the impact of the waves.

[0066] Slamming is a localized, instantaneous impact problem, often accompanied by rapid changes in the wetted surface of the hull and highly nonlinear phenomena such as liquid splashing. Under slamming pressure, the hull structure deforms and generates strain. By designing and manufacturing suitable load-bearing components, the slamming pressure borne by the hull can be obtained from the strain of these components. This load-bearing component is the pressure sensor in this embodiment.

[0067] Generally, considering the main dimensions of the actual ship and ease of use, the base 3 is preferably a circular ring structure, which serves to support the outer plate 5 of the hull. The outer diameter of the outer end face ranges from 100mm to 200mm. The circular ring structure of the base 3 is easy to process, and the outer plate 5 of the hull is also easy to drill holes in. The matching pressure plate 2 is also circular. When the strain of the circular pressure plate 2 is subjected to the impact of sea waves, there are theoretical and analytical solutions for converting it into pressure, which is convenient for calculation.

[0068] By using an annular base 3 as the mounting structure for the pressure sensor, a pressure plate 2 that withstands wave impacts is installed on the outer end face of the annular base 3, and a strain sensor 1 is installed on the inner center of the pressure plate 2. This creates a slamming pressure sensor suitable for actual ships, converting the deformation of the pressure plate 2 into pressure, making the measured impact pressure more macroscopic and reflecting the actual wave load. At the same time, the structure is simple and the testing cost is low. This solves the problems of inconvenient installation, sensitivity to external loads, and poor anti-interference performance of existing small finished pressure sensors, which lead to inaccurate measurements.

[0069] Furthermore, the pressure plate 2 is a steel plate, and the periphery of the pressure plate 2 is connected to the outer end face of the base 3 by the first bolt 21.

[0070] Specifically, the base 3 is made of steel and has a circular ring structure. The pressure plate 2 is a circular thin sheet. The pressure plate 2 is fixedly installed on the base 3 by bolts to ensure that the deformation in the middle of the pressure plate 2 can better reflect the impact pressure.

[0071] Furthermore, the thickness of the pressure plate 2 is 1mm to 3mm. Under this thickness condition, the pressure plate 2 is more sensitive to the impact of sea waves and can better obtain the slamming pressure borne by the hull through the strain at the center of the pressure plate 2.

[0072] Furthermore, strain sensor 1 is a strain gauge. The signal acquisition module includes a dynamic strain gauge.

[0073] There are several ways to connect the base 3 to the hull plate 5:

[0074] In one scenario: if the ship can have openings, a through hole is made in the hull outer plating 5. The base 3 is sealed to the hull outer plating 5 using a second bolt 31 and a gasket 4. The through hole corresponds to the outer circumference of the outer end face of the base 3. When the base 3 is a circular annular structure, the diameter of the through hole is equal to the outer diameter of the outer end face of the base 3. For example... Figure 1 As shown, the base 3 and the outer plate 5 are installed in a flange manner, and the opening is sealed by a gasket 4. Preferably, the outer surface of the pressure plate 2 is flush with the outer surface of the outer plate 5.

[0075] In one scenario: where the ship cannot have holes drilled, i.e., the hull plating 5 is not perforated, and the base 3 is attached to the outer surface of the hull plating 5. The side of the pressure plate 2 without the strain sensor 1 (i.e., the outer surface) bears the impact of the waves. In this case, when the waves impact the pressure sensor, in order to minimize the impact of the pressure sensor's presence on the flow field, the overall thickness of the base 3 can be thinner than in the previous scenario.

[0076] The pressure sensor in this embodiment can be installed flexibly, either by drilling holes in the outer plate 5 of the hull or by directly installing it on the outer plate 5 of the hull. At the same time, the pressure plate 2 can be replaced at any time according to the actual situation. It is easy to install, highly applicable, and has a wide range of applications.

[0077] The pressure sensor in this embodiment can be installed on a real ship for a long time. If the pressure sensor is damaged during use, it can be easily and quickly disassembled and replaced.

[0078] Traditional pressure sensors are calibrated using specialized instruments. However, the non-standard pressure sensor in this embodiment cannot be calibrated using traditional methods. Therefore, a calibration method compatible with this type of pressure sensor has been developed.

[0079] The method for measuring the slamming pressure experienced by a ship while sailing in ocean waves, as described in this embodiment, includes the following steps:

[0080] S1. Calibrate the pressure sensor, such as... Figure 2 As shown:

[0081] S11. Place the assembled strain sensor 1, pressure plate 2 and base 3 on the workbench, so that the strain sensor 1 is located on the lower surface of the pressure plate 2, and connect the strain sensor 1 to the signal acquisition module.

[0082] S12. A loading cylinder 6 is sealed and installed on the upper surface of the pressure plate 2. The inner wall profile of the loading cylinder 6 is larger than the inner ring profile of the base 3, so that the inner wall of the loading cylinder 6 and the upper surface of the pressure plate 2 form a water storage cavity. In step S12, the inner wall profile of the loading cylinder 6 is larger than the inner ring profile of the base 3 so that all positions of the pressure plate 2 are subjected to the action of water in the loading cylinder 6. When the inner rings of the loading cylinder 6 and the base 3 are both circular, the inner diameter of the cross section of the loading cylinder 6 is larger than the inner diameter of the base 3.

[0083] S13. Add the same amount of water into the water storage chamber one by one. Each time the water level rises by Δh, record the change in the signal of strain sensor 1 by Δε.

[0084] S14. Gradually reduce the same amount of water into the water storage chamber, with the water level decreasing by Δh each time, and record the change in the signal Δε of strain sensor 1 each time.

[0085] S15. Calculate the pressure sensor coefficient δ;

[0086]

[0087] In formula (b), δ is the pressure sensor coefficient, ρ is the water density, g is the gravitational acceleration, and Δh is the change in water level during the calibration process. This represents the average change in strain signal Δε after each addition or extraction of water during the calibration process.

[0088] S2. Install the pressure sensor at the location of the impact pressure to be measured on the outer plate 5 of the ship.

[0089] S3. Connect the pressure sensor to the signal acquisition module.

[0090] S4. When a ship is sailing in the waves, the wave impact pressure sensor is subjected to impact pressure. The signal acquisition module collects the measurement signal and transmits it to the signal processing module.

[0091] S5. The signal processing module will process the measured signal to obtain the time-series data of the impact pressure:

[0092] The expression for the time-history data of slamming pressure is:

[0093] p(t)=δ·ε(t) (a)

[0094] In formula (a), p(t) is the impact pressure duration, ε(t) is the strain signal duration, and δ is the pressure sensor coefficient.

[0095] The outer end face of the ring-shaped base 3 serves as the mounting support surface for the pressure plate 2. At the same time, during the calibration of the pressure sensor, this end face also serves as the support surface for the loading cylinder 6. By simply changing the height of the water level in the loading cylinder 6, different loads can be applied to the pressure plate 2 to calibrate the pressure sensor. This calibration device has a simple structure, excellent stability and reliability, and strong operability.

[0096] Example 2:

[0097] like Figure 3 As shown, the pressure plate 2 is a circular steel plate with a diameter of 200mm. The thickness can be set to 1mm to 3mm according to the local structural characteristics of the actual ship. Two rings of first mounting holes 20 with a diameter of 3mm are machined around the pressure plate 2.

[0098] like Figure 4 As shown, the outer diameter of the gasket 4 is 250mm, the inner diameter is 200mm, the thickness is 3mm, and a perforation 40 with a diameter of 7mm is machined around its perimeter.

[0099] like Figures 4-6 As shown, the outer diameter of the inner end face of the base 3 is 250mm and the inner diameter is 150mm. The outer diameter of the outer end face of the base 3 is 200mm. The overall thickness of the base 3 is 36mm (which can be adjusted appropriately according to the specific structure of the hull). The base 3 has a third mounting hole 320 with a diameter of 7mm processed around its perimeter. The third mounting hole 320 corresponds one-to-one with the through hole 40 of the gasket 4. At the same time, the outer end face of the base 3 has a second mounting hole 310 with a diameter of 3mm. The second mounting hole 310 is a threaded blind hole and corresponds one-to-one with the first mounting hole 20 of the pressure plate 2.

[0100] like Figure 1 As shown, there are two methods for installing and using pressure sensors. For some experimental vessels, where openings in the hull structure are permitted, the installation steps for the pressure sensors are as follows:

[0101] (1) A 200mm diameter circular hole is made in the area of ​​severe slamming on the bow. 7mm diameter threaded holes are machined around the circular hole. The threaded holes correspond one-to-one with the third mounting hole 320 on the base 3.

[0102] (2) Attach the strain sensor 1 to the center of the pressure plate 2, place the pressure plate 2 on the base 3, rotate the pressure plate 2 to align the holes of the two, and fix it with the first bolt 21. The strain sensor 1 is located inside the pressure plate 2.

[0103] (3) Install the shim 4 on the base 3, rotate the shim 4 so that the through hole 40 is aligned with the third mounting hole 320 on the base 3, then insert the outer end face of the base 3 into the 200mm diameter round hole on the outer plate 5 of the ship, rotate the base 3 so that the third mounting hole 320 on the base 3 is aligned with the threaded hole on the outer plate 5 of the ship, and firmly fix the base 3 on the outer plate 5 of the ship with the 7mm second bolt 31.

[0104] (4) Connect strain sensor 1 to dynamic strain gauge. After debugging, the slamming pressure in actual sea conditions can be measured.

[0105] In most cases, when the hull is in normal working condition or in service, it is not permissible to drill holes in the hull structure. In such cases, the installation steps for the pressure sensor are as follows:

[0106] (1) Attach the strain sensor 1 to the center of the inner side of the pressure plate 2, place the pressure plate 2 on the base 3, rotate the pressure plate 2 to align the holes of the two, and fix it with the first bolt 21.

[0107] (2) Determine the impact pressure measurement point on the outside of the hull and fix the pressure sensor to the impact pressure measurement point on the outer plate 5 of the hull with strong adhesive. At this time, the overall thickness of the base 3 does not need to be set to 36mm, and 10mm is generally sufficient.

[0108] (3) Connect strain sensor 1 to dynamic strain gauge. After debugging, the impact pressure in actual sea conditions can be measured.

[0109] like Figure 2 As shown, the pressure sensor needs to be calibrated before installation. The steps are as follows:

[0110] (1) Attach the strain sensor 1 to the center of the inner side of the pressure plate 2, and assemble the pressure plate 2 with the base 3;

[0111] (2) Invert the assembled base 3 onto the calibration platform, connect the strain sensor 1 to the instrument, and ensure the signal is normal after debugging;

[0112] (3) Place the transparent loading cylinder 6 on the pressure plate 2. The inner diameter of the loading cylinder 6 is between 150mm and 200mm, and the outer surface has height markings. Use 703 glue to seal the contact between the loading cylinder 6 and the pressure plate 2.

[0113] (4) Add a certain amount of water from the top of the loading cylinder 6 and measure the signal of the strain sensor 1. At this time, the output signal of the strain sensor 1 and the water level in the loading cylinder 6 are set to zero.

[0114] (5) Water was added to the transparent ring-shaped cylinder three times in succession. Each time water was added, the water level changed in a consistent manner, and the change in the signal of strain sensor 1 was recorded.

[0115] (6) Water was pumped out from the transparent ring tube three times in succession. The change in liquid level was consistent with that in step (5). The change in strain signal was recorded each time.

[0116] (7) Calculate the pressure sensor coefficient according to formula (b);

[0117]

[0118] Where δ is the pressure sensor coefficient, ρ is the water density, g is the gravitational acceleration, and Δh is the change in water level during the calibration process. This represents the average change in strain signal after each addition and extraction of water during the calibration process.

[0119] (8) During the formal test, the impact pressure is calculated according to formula (a).

[0120] p(t)=δ·ε(t) (a)

[0121] Where p(t) is the impact pressure duration and ε(t) is the strain signal duration.

[0122] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A method for measuring the slamming pressure experienced by a ship while sailing in ocean waves, characterized in that: The vessel is a real ship and also includes pressure sensors, signal acquisition modules, and signal processing modules; The method for measuring impact pressure includes the following steps: S1. Calibrate the pressure sensor; S2. Install the pressure sensor at the location of the slamming pressure to be measured on the outer plate (5) of the ship; S3. Connect the pressure sensor to the signal acquisition module; S4. During the ship's navigation in the waves, the wave impact pressure sensor is subjected to the impact pressure, and the signal acquisition module collects the measurement signal and transmits it to the signal processing module. S5. The signal processing module will process the measurement signal to obtain the time history data of the impact pressure. The structure of a single pressure sensor includes a ring-shaped base (3) and a thin-film pressure plate (2). The pressure plate (2) is detachably installed on the outer end face of the base (3), and the base (3) is sealed to the outer plate (5) of the ship. One side of the pressure plate (2) is subjected to the impact of the waves, and a strain sensor (1) is installed at the center of the other side of the pressure plate (2). The strain sensor (1) is used to measure the strain of the pressure plate (2) under the impact of the waves. The strain signal output by the strain sensor (1) is the measurement signal. In step five, the time-history data expression for the slamming pressure is: （a） In formula (a), For impact pressure time history, For the strain signal time history, This refers to the pressure sensor coefficient. When calibrating a pressure sensor, the steps include: S11. Place the assembled strain sensor (1), pressure plate (2) and base (3) on the workbench, so that the strain sensor (1) is located on the lower surface of the pressure plate (2), and connect the strain sensor (1) to the signal acquisition module. S12. A loading cylinder (6) is sealed and installed on the upper surface of the pressure plate (2). The inner wall profile of the loading cylinder (6) is larger than the inner ring profile of the base (3), so that the inner wall of the loading cylinder (6) and the upper surface of the pressure plate (2) form a water storage cavity. S13. Add the same amount of water to the water storage chamber one at a time, raising the water level each time. Record the change in the strain sensor (1) signal each time. ; S14. Gradually reduce the same amount of water into the water storage chamber, lowering the water level each time. Record the change in the strain sensor (1) signal each time. ; S15, Calculate the pressure sensor coefficient ; （b） In formula (b), For pressure sensor coefficients, For the density of water, It is the acceleration due to gravity. This represents the change in water level during the calibration process. The change in strain signal after each addition or extraction of water during the calibration process. The mean.

2. The method for measuring the slamming pressure experienced by a ship while navigating in ocean waves as described in claim 1, characterized in that: There are multiple pressure sensors.

3. The method for measuring the slamming pressure experienced by a ship while sailing in ocean waves as described in claim 1, characterized in that: The pressure plate (2) is a steel plate, and the periphery of the pressure plate (2) is connected to the outer end face of the base (3) by the first bolt (21).

4. The method for measuring the slamming pressure experienced by a ship while sailing in ocean waves as described in claim 3, characterized in that: The thickness of the pressure plate (2) is 1mm to 3mm.

5. The method for measuring the slamming pressure experienced by a ship while navigating in ocean waves as described in claim 1, characterized in that: The strain sensor (1) is a strain gauge.

6. The method for measuring the slamming pressure experienced by a ship while navigating in ocean waves as described in claim 1, characterized in that: The signal acquisition module includes a dynamic strain gauge.

7. The method for measuring the slamming pressure experienced by a ship while navigating in ocean waves as described in claim 1, characterized in that: A through hole is provided on the outer plate (5) of the ship. The base (3) is sealed to the outer plate (5) by a second bolt (31) and a gasket (4). The diameter of the through hole is equal to the outer diameter of the outer end face of the base (3).

8. The method for measuring the slamming pressure experienced by a ship while navigating in ocean waves as described in claim 1, characterized in that: The outer hull plate (5) has no holes, and the base (3) is attached to the outer surface of the outer hull plate (5).

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