Overall elastic ship model load calibration device and calibration method

Abstract

The invention relates to an integral elastic ship model load calibration device and calibration method, and the device comprises strain sensors which are disposed in structural stress regions of a ship model deck, a bottom plate, a side strake and the like; the multiple water storage tanks are arranged on the upper deck of the ship model, tank bodies of the water storage tanks are fixed to the cross beams below in a bolt connection mode, air guide pipes are arranged at the tops of the water storage tanks, and water passing pipes are arranged at the bottoms of the water storage tanks; one end of the air guide pipe is connected with the vent hole of the water storage tank, and the other end is connected with the air extractor; one end of the water pipe is arranged at the bottom in the water storage tank, and the other end is arranged below the water surface of the test pool; and the air extractor is connected with the water storage tank through an air guide pipe. The device is compact and reasonable in structure and convenient to operate, the water level in the water storage tank is controlled through the air pumping and pressing machine, and accurate application and control of the vertical bending moment and the torque load of the ship model are achieved. The device has the beneficial effects of improving test accuracy and efficiency, keeping the floating state of the ship model stable and the like; according to the method, accurate loading and unloading are realized, and the data processing flow is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field, and in particular to an overall elastic ship model load calibration device and a calibration method. Background Art

[0002] In recent years, the main dimensions of ships have been increasing, and the operating speeds of ships have also been continuously improved. Coupled with the widespread application of high-strength steel, the flexibility of the hull girder has increased, resulting in a fluid-structure coupling phenomenon between the hull and the wave environment, causing the hull girder to bear greater loads and affecting the structural strength safety of the hull. To accurately evaluate the magnitude of the above loads, in addition to using theoretical calculation methods, ship model tests must also be carried out in a test tank for verification. Based on the continuity similarity of the ship model stiffness, the overall elastic ship model test can not only obtain the measured sectional loads, but also obtain the stress loads in the local structural areas. After the overall elastic ship model is connected and debugged, the wave bending moment and shear force must be inspected before the test to determine the calibration coefficient of the strain gauge.

[0003] Currently, limited by the test site conditions, usually the on-site test personnel take a small boat and apply multiple sets of ballast iron at specific positions of the model, and record the load values of the corresponding measuring points. During the process of adding ballast by the test personnel, the swaying of the small boat will generate large wave disturbances on the ship model, affecting the test efficiency and the accuracy of the calibration data. At the same time, the added ballast changes the floating state of the test ship model, and the influence brought by the change of the hydrostatic load needs to be considered additionally when analyzing the calibration data, increasing the difficulty of data processing.

[0004] Therefore, we propose an overall elastic ship model load calibration device and a calibration method. Summary of the Invention

[0005] The applicant of the present invention aims at the above-mentioned disadvantages in the existing production technology, and provides an overall elastic ship model load calibration device and a calibration method. By controlling the water level in the water storage tank with an air compressor, the accurate application and control of the vertical bending moment and torque loads of the ship model are realized. The device has beneficial effects such as improving the test accuracy and efficiency and maintaining the stable floating state of the ship model; the method realizes accurate loading and unloading and simplifies the data processing process.

[0006] The technical solution adopted by the present invention is as follows:

[0007] An overall elastic ship model load calibration device, comprising:

[0008] Strain sensors, arranged in the structural stress areas such as the deck, bottom plate, and side shell plate of the ship model, for monitoring the strain changes of the ship model;

[0009] A water storage tank, with multiple numbers, is arranged on the upper deck of the ship model. Its tank body is fixed to the lower cross beam by means of bolt connection. An air duct is provided at the top, and a water pipe is provided at the bottom, which is used to apply vertical bending moment and torque load by changing the water volume.

[0010] An air duct, one end is connected to the vent hole of the water storage tank, and the other end is connected to an air extraction press, which is used to transmit and control the air pressure in the water storage tank.

[0011] A water pipe, one end is placed at the bottom inside the water storage tank, and the other end is placed below the water surface of the test pool, allowing the water to flow between the water storage tank and the pool.

[0012] An air extraction press, connected to the water storage tank through an air duct, is used to control the air pressure in the water storage tank, thereby adjusting the water volume in the water storage tank.

[0013] A water level sensor, installed on the inner wall of the water storage tank, is used to monitor and record the water level in the water storage tank in real time to calculate the mass of water.

[0014] In one embodiment, the tank body of the water storage tank is arranged at the upper deck cross beam of the ship model's transverse frame, ensuring that the water storage tank does not affect the local strength of the overall ship model.

[0015] In one embodiment, each of the water storage tanks is provided with a vent hole connected to an air duct, and the air duct connects the air extraction press and the water storage tank.

[0016] In one embodiment, the water level sensor can monitor and record the water volume in the water storage tank in real time to assist in calculating the mass of the liquid in the water storage tank.

[0017] An overall elastic ship model load calibration method, which uses the above-mentioned overall elastic ship model load calibration device, includes the following steps:

[0018] (a) Prepare instruments: Connect the water level sensor of the water storage tank to the data acquisition system, adjust the water volume in each water storage tank to half of the capacity position, and start the air extraction press.

[0019] (b) Check signals: Check the vertical bending moment and torsional moment measurement point signals of the test ship model to ensure normal signal transmission.

[0020] (c) Change the water volume: By controlling the air extraction press, adjust the air pressure in a specific water storage tank to change the water volume in the water storage tank, thereby applying a vertical bending moment or torque load.

[0021] (d) Record the strain signal: After the water level in the water storage tank stabilizes, record the strain signal at this time.

[0022] (e) Step - by - step loading and unloading: Repeat steps (c) and (d), gradually increasing or decreasing the water volume in the water storage tank until a predetermined loading or unloading state is reached;

[0023] (f) Data analysis: Based on the recorded strain signals and the corresponding vertical bending moment or torque loads, perform data analysis to obtain the calibration coefficients of each strain gauge.

[0024] In one embodiment, in step (c), the discharge or entry of water volume is controlled by increasing or decreasing the air pressure in the water storage tank.

[0025] In one embodiment, it further includes the specific steps of sagging bending moment load calibration, where the sagging bending moment is applied by controlling the water volume change in a specific water storage tank; the sagging bending moment load calibration includes a step - by - step loading and unloading process, and the strain signals are recorded after each loading or unloading.

[0026] In one embodiment, it further includes the specific steps of hogging bending moment load calibration, where the hogging bending moment is applied by controlling the water volume change in a specific water storage tank.

[0027] According to the overall elastic ship model load calibration method described in claim 5, it further includes the specific steps of positive and negative torque load calibration, where the torque load is applied by controlling the water volume change in the water storage tanks on both sides of the ship model;

[0028] During the calibration process of the torque and vertical bending moment loads, the floating state of the ship model does not change. Only by changing the mass distribution on the ship, internal forces are applied to the ship model.

[0029] In one embodiment, the data analysis step includes recording the strain vs. the corresponding vertical bending moment or torque load curve under each strain gauge, and obtaining the calibration coefficients of each strain gauge through data analysis.

[0030] The beneficial effects of the present invention are as follows:

[0031] The structure of the present invention is compact, reasonable, and easy to operate. By controlling the water level in the water storage tank with an air extraction press, the accurate application and control of the vertical bending moment and torque loads of the ship model are achieved. The device has beneficial effects such as improving the test accuracy and efficiency, and maintaining the stable floating state of the ship model; the method realizes accurate loading and unloading and simplifies the data processing process. This device and method not only avoid the test errors and data processing difficulties brought by traditional manual ballast placement, but also provide accurate external load data for the calibration of the overall elastic ship model, ensuring the accuracy of test data analysis. At the same time, it has a high degree of automation and simple operation, greatly improving the efficiency and reliability of the ship model test, and providing strong technical support for the evaluation of ship structural strength.

[0032] At the same time, the present invention also has the following advantages:

[0033] Summary of the beneficial effects of the device

[0034] For the overall elastic ship model load calibration device of the present invention, the water level in the water storage tank is controlled by an air compressor, and the vertical bending moment and torque loads borne by the ship model are accurately adjusted. This automatic control method avoids the test errors caused by the traditional manual placement of ballast, such as the wave disturbance caused by the swaying of the small boat, and significantly improves the accuracy and efficiency of the test. At the same time, the device can real-time monitor and record the water level in the water storage tank, providing accurate external load data for test data analysis.

[0035] The device arranges multiple water storage tanks at specific positions of the ship model, applies loads by adjusting the water volume in the water storage tanks, and at the same time keeps the floating state of the ship model unchanged. This avoids the problem of changing the floating state of the test ship model in the traditional method, so that the influence of the change of the hydrostatic load does not need to be considered additionally during the calibration data analysis, and simplifies the data processing process.

[0036] For the ship model load calibration method of the present invention, the air pressure in the water storage tank is controlled by an air compressor, and the water volume in the water storage tank is accurately adjusted, so as to realize the accurate loading and unloading of the vertical bending moment and torque loads of the ship model. This method can load and unload step by step, record the strain under each strain gauge and the corresponding load curve graph, providing detailed data support for data analysis. Since the device can keep the floating state of the ship model stable and the loading and unloading process has a high degree of automation, the influence of the change of the hydrostatic load does not need to be considered during the calibration data analysis. This greatly simplifies the data processing flow, improves the accuracy and efficiency of data analysis. At the same time, by recording the corresponding relationship between the strain signal and the load, the calibration coefficient of each strain gauge can be easily obtained, providing a reliable basis for subsequent ship model tests. Brief description of the drawings

[0037] Figure 1 It is a schematic diagram of the overall elastic ship model of the present invention.

[0038] Figure 2 It is a schematic diagram of the structure of the water storage tank of the device of the present invention.

[0039] Figure 3 It is a calibration schematic diagram of the ship model of the present invention under the action of the midship bending moment load.

[0040] Figure 4 It is a calibration schematic diagram of the ship model of the present invention under the action of the hogging bending moment load.

[0041] Figure 5 It is a calibration schematic diagram of the ship model of the present invention under the action of the positive torque load.

[0042] Figure 6 It is a calibration schematic diagram of the ship model of the present invention under the action of the negative torque load.

[0043] Wherein:

[0044] 1. Water level sensor; 2. Vent hole; 3. Air duct; 4. Water pipe; 5. Tank body of water storage tank; 6. Air compressor.

[0045] L1-L6, lateral position; S1-S8, water storage tank. Specific implementation mode

[0046] The following combines with the attached drawings to illustrate the specific implementation mode of the present invention.

[0047] Embodiment 1

[0048] As Figure 1 shown, the overall elastic ship model load calibration device of this embodiment includes a strain sensor, a water storage tank, an air duct 3, an air compressor 6, and a water level sensor 1. The water level in the water storage tank on the specific position of the ship model is controlled by the air compressor 6, so that the ship model bears the vertical bending moment and torque loads of determined values, thereby providing accurate external load data for the calibration of the overall elastic ship model and ensuring the accuracy of test data analysis.

[0049] Specifically, the strain sensor is arranged in the structural stress areas such as the deck, bottom plate, and side shell plate of the ship model, and is used to monitor the strain change of the ship model;

[0050] The water storage tank, the number of which is multiple, is arranged on the upper deck of the ship model. Its tank body 5 is fixed to the lower cross beam by means of bolt connection. An air duct 3 is provided at the top, and a water pipe 4 is provided at the bottom, and is used to apply vertical bending moment and torque loads by changing the water volume;

[0051] The air duct 3, one end of which is connected to the vent hole 2 of the water storage tank, and the other end is connected to the air compressor 6, and is used to transmit and control the air pressure in the water storage tank;

[0052] The water pipe 4, one end of which is placed at the bottom inside the water storage tank, and the other end is placed below the water surface of the test pool, allowing the water to flow between the water storage tank and the pool;

[0053] The air compressor 6 is connected to the water storage tank through the air duct 3, and is used to control the air pressure in the water storage tank, thereby adjusting the water volume in the water storage tank;

[0054] The water level sensor 1 is installed on the inner wall of the water storage tank, and is used to monitor and record the water level in the water storage tank in real time to calculate the mass of water. The water level sensor 1 can monitor and record the water volume in the water storage tank in real time to assist in calculating the mass of the liquid in the water storage tank.

[0055] The strain sensors are arranged in the stress-bearing areas of the structural parts such as the deck, bottom plate, and side shell plates of the ship model. The water storage tanks are arranged on the upper deck of the ship model. An air duct 3 is provided at the top, and a water pipe 4 is provided at the bottom. The air duct 3 is connected to an air extraction press 6 through a conduit, and the water pipe 4 is inserted into the test water pool. The water level sensor 1 is used to measure the depth of the water in the water storage tank, so as to assist the test personnel to calculate the mass of the liquid in the water storage tank.

[0056] The overall elastic ship model load calibration device of the present invention includes a plurality of water storage tanks arranged at specific positions of the ship model. The tank body 5 of the water storage tank is arranged at the upper deck beam of the transverse frame of the ship model, and the tank body 5 is fixed to the lower beam by means of bolt connection. The water level sensor 1 of the water storage tank is installed on the inner wall of its container to monitor and record the water volume in the container in real time. The vent hole 2 on the water storage tank is installed at the top of its container and is connected to the air duct 3 on the water storage tank. One end of the air duct 3 on the water storage tank is connected to the vent hole 2, and the other end is connected to the air extraction press 6. The air pressure in the water storage tank is controlled by the air extraction press 6 to adjust the volume of water in the water storage tank. One end of the water pipe 4 on the water storage tank is placed at the bottom inside the water storage tank, and the other end is placed below the water surface of the test water pool.

[0057] The device of the present invention controls the water volume in the water storage tank on the deck of the ship model based on the air extraction press 6 to change the stress state of the ship model, thereby avoiding the test errors caused by the traditional manual placement of ballast.

[0058] At the same time, the vertical bending moment and torque load calibration method of the present invention precisely controls the external load bending moment applied to the ship model by adjusting the water volume in the water storage tanks at specific positions while keeping the floating state of the ship model unchanged.

[0059] Embodiment 2

[0060] In this embodiment, a method for calibrating the midship bending moment load of a test ship model is disclosed. By using the overall elastic ship model load calibration device in Embodiment 1, after the instrument joint adjustment test of the launched test ship model, it is necessary to carry out the ship model load calibration. The specific calibration method includes the following steps:

[0061] Instrument preparation: Connect the water level sensors of the water storage tanks S1, S2, S7, and S8 to the data acquisition system, adjust the water volume in each water storage tank to half of its capacity, and the air extraction press is powered on for operation;

[0062] Calibration signal inspection: Check the signals of the vertical bending moment and torsional bending moment measuring points of the test ship model to ensure normal signal transmission;

[0063] Changing the water volume: Control the air extraction presses corresponding to the water storage tanks S1, S2, S7, and S8 respectively, and pressurize the air in the water storage tanks S1 and S8, so that the mass of the water discharged from the water storage tanks S1 and S8 to the external water pool is both ms1 Reduce the air pressure in water storage tanks S2 and S7 so that the mass of water entering from the external water pool into water storage tanks S2 and S7 is both m s1 . Among them, the change in the mass of water in each water storage tank is calculated from the water level signal collected by the water level sensor; the vertical distance between water storage tanks S1 and S2 is the same as the vertical distance between water storage tanks S7 and S8, both being L;

[0064] Record the strain signal: After the water level in the water storage tank stabilizes, record the strain signal ε at this time s1 . At this time, the force state of the ship model is as Figure 3 shown, the vertical shear force value is P = m s1 g, and the vertical bending moment is M = m s1 gL;

[0065] Reload: Continue to increase the air pressure in water storage tanks S1 and S8 so that the total mass of water discharged from water storage tanks S1 and S8 to the external water pool is both m s2 ; continue to reduce the air pressure in water storage tanks S2 and S7 so that the total mass of water entering from the external water pool into water storage tanks S2 and S7 is both m s2 ; after the water level in each water storage tank stabilizes, record the strain signal ε at this time s2 . At this time, the force state of the ship model is as Figure 3 shown, the vertical shear force value is P = m s2 g, and the vertical bending moment is M = m s2 gL;

[0066] Gradually load: Repeat step 5 until the water in water storage tanks S2 and S7 fills the entire container, and the loading process is completed;

[0067] Unload: After the loading is completed, control the air extractors corresponding to water storage tanks S1, S2, S7, and S8 respectively, reduce the air pressure in water storage tanks S1 and S8 so that water enters from the external water pool into water storage tanks S1 and S8, and the total mass change of water storage tanks S1 and S8 is m s3 ; increase the air pressure in water storage tanks S2 and S7 so that water storage tanks S2 and S7 discharge water to the external water pool, and the total mass change of water storage tanks S2 and S7 is m s3 ; after the water level in the water storage tank stabilizes, record the strain signal ε at this time s3 . At this time, the force state of the ship model is as Figure 3 shown, the vertical shear force value is P = m s3 g, and the vertical bending moment is M = m s3 gL;

[0068] Gradual unloading: Repeat Step 7 until the water volumes in water storage tanks S1, S2, S7, and S8 are the same as those in the initial state, and the calibration of the midship bending moment load is completed;

[0069] Data analysis: Based on the above steps, record the strain vs. corresponding vertical bending moment load curves under each strain gauge, and perform data analysis to obtain the calibration coefficients of each strain gauge.

[0070] Among them, in this embodiment, L1 to L6 represent the lateral positions where the water storage tanks are placed; S1 - S8 represent the numbers of the water storage tanks at specific positions.

[0071] Embodiment 3

[0072] This embodiment discloses a method for calibrating the hogging bending moment load of a test ship model. Using the overall elastic ship model load calibration device in Embodiment 1, after instrument joint debugging and testing of the launched test ship model, ship model load calibration needs to be carried out. The specific calibration method includes the following steps:

[0073] Instrument preparation: Connect the water level sensors of water storage tanks S1, S2, S7, and S8 to the data acquisition system, adjust the water volume in each water storage tank to half of its capacity, and connect the air extraction press to power for operation;

[0074] Calibration signal check: Check the signals of the vertical bending moment and torsional bending moment measurement points of the test ship model to ensure normal signal transmission;

[0075] Change the water volume: Control the air extraction presses corresponding to water storage tanks S1, S2, S7, and S8 respectively, reduce the air pressure in water storage tanks S1 and S8, so that the mass of water entering from the external water pool into water storage tanks S1 and S8 is both m h1 ; increase the air pressure in water storage tanks S2 and S7, so that the mass of water discharged from water storage tanks S2 and S7 to the external water pool is both m h1 ; among them, the change in the mass of water in each water storage tank is calculated through the water level signal collected by the water level sensor; the vertical distance between water storage tanks S1 and S2 is the same as the vertical distance between water storage tanks S7 and S8, both being L;

[0076] Record the strain signal: After the water level in the water storage tank is stable, record the strain signal ε at this time h1 . At this time, the force state of the ship model is as Figure 4 shown, the vertical shear force value is P = m h1 g, and the vertical bending moment is M = m h1 gL;

[0077] Reload: Continue to reduce the air pressure in water storage tanks S1 and S8, so that the total mass of water entering from the external water pool into water storage tanks S1 and S8 is m each. h2 ; Continue to increase the air pressure in water storage tanks S2 and S7, so that the total mass of water discharged from water storage tanks S2 and S7 to the external water pool is m each. h2 ; After the water levels in each water storage tank are stable, record the strain signal ε at this time. 2 . At this time, the force state of the ship model is as Figure 4 shown, and the vertical shear force value is P = m h2 g, and the vertical bending moment is M = m h2 gL;

[0078] Step-by-step loading: Repeat step 5 until the water in water storage tanks S1 and S8 fills the entire container, and the loading process is completed;

[0079] Unloading: After the loading is completed, control the air compressors corresponding to water storage tanks S1, S2, S7, and S8 respectively, and increase the air pressure in water storage tanks S1 and S8, so that water storage tanks S1 and S8 discharge water to the external water pool, and the total mass change of water storage tanks S1 and S8 is m h3 ; Reduce the air pressure in water storage tanks S2 and S7, so that water storage tanks S2 and S7 receive water from the external water pool, and the total mass change of water storage tanks S2 and S7 is m h3 ; After the water levels in the water storage tanks are stable, record the strain signal ε at this time. 3 . At this time, the force state of the ship model is as Figure 4 shown, and the vertical shear force value is P = m h3 g, and the vertical bending moment is M = m h3 gL;

[0080] Step-by-step unloading: Repeat step 7 until the water in water storage tanks S1, S2, S7, and S8 is the same as that in the initial state, and the calibration of the hogging bending moment load is completed;

[0081] Data analysis: Based on the above steps, record the strain under each strain gauge and the corresponding vertical bending moment load curve diagram, and perform data analysis to obtain the calibration coefficient of each strain gauge.

[0082] Example 4

[0083] This example discloses a method for calibrating the positive torque load of a test ship model. Using the overall elastic ship model load calibration device in Example 1, after the instrument joint debugging test of the launched test ship model, it is necessary to carry out the ship model load calibration. The specific calibration method includes the following steps:

[0084] Instrument preparation: Connect the water level sensors of water storage tanks S3, S4, S5, and S6 to the data acquisition system, adjust the water volume in each water storage tank to half of its capacity, and connect the air compressor to power for operation;

[0085] Calibration signal check: Check the signals of the vertical bending moment and torsional moment measurement points of the test ship model to ensure normal signal transmission;

[0086] Change the water volume: Control the air compressors corresponding to water storage tanks S3, S4, S5, and S6 respectively, pressurize and aerate water storage tanks S4 and S5, so that the mass of the water discharged from water storage tanks S4 and S5 to the external water pool is both m t1 ; Decompress and de-aerate water storage tanks S3 and S6, so that the mass of the water entering water storage tanks S3 and S6 from the external water pool is both m t1 . Among them, the change in the mass of water in each water storage tank is calculated through the water level signal collected by the water level sensor; the vertical distance between water storage tanks S3 and S4 is the same as the horizontal distance between water storage tanks S5 and S6, both of which are H;

[0087] Record the strain signal: After the water level in the water storage tank is stable, record the strain signal ε at this time t1 . At this time, the force state of the ship model is as Figure 3 shown, the vertical shear force value is Q = m t1 g, and the vertical bending moment is T = m t1 gH;

[0088] Reload: Continue to pressurize and aerate water storage tanks S4 and S5, so that the total mass of the water discharged from water storage tanks S4 and S5 to the external water pool is both m again t2 ; Continue to decompress and de-aerate water storage tanks S3 and S6, so that the total mass of the water entering water storage tanks S3 and S6 from the external water pool is both m t2 ; After the water level in each water storage tank is stable, record the strain signal ε at this time t2 . At this time, the force state of the ship model is as Figure 3 shown, the vertical shear force value is Q = m t2 g, and the vertical bending moment is T = m t2 gH;

[0089] Gradually load: Repeat step 5 until the water in water storage tanks S3 and S6 fills the entire container, and the loading process is completed;

[0090] Unloading: After the loading is completed, control the air compressors corresponding to the water storage tanks S3, S4, S5, and S6 respectively to reduce the air pressure in the water storage tanks S4 and S5, so that water enters the water storage tanks S4 and S5 from the external water pool, and the total mass change of the water storage tanks S4 and S5 is m t3 ; Increase the air pressure in the water storage tanks S3 and S6, so that the water storage tanks S3 and S6 discharge water to the external water pool, and the total mass change of the water storage tanks S3 and S6 is m t3 ; After the water level in the water storage tank is stable, record the strain signal ε at this time t3 . At this time, the force state of the ship model is as Figure 3 shown, the vertical shear force value is Q = m t3 g, and the vertical bending moment is T = m t3 gH;

[0091] Gradual unloading: Repeat step 7 until the water volume in the water storage tanks S3, S4, S5, and S6 is the same as that in the initial state, and the calibration of the positive torque load is completed;

[0092] Data analysis: Based on the above steps, record the strain vs. corresponding torque load curve under each strain gauge, and perform data analysis to obtain the calibration coefficient of each strain gauge.

[0093] Example 5

[0094] In this example, a method for calibrating the negative torque load of a test ship model is disclosed. Using the overall elastic ship model load calibration device in Example 1, after the instrument joint adjustment test of the launched test ship model, it is necessary to carry out the ship model load calibration. The specific calibration method includes the following steps:

[0095] Instrument preparation: Connect the water level sensors of the water storage tanks S3, S4, S5, and S6 to the data acquisition system, adjust the water volume in each water storage tank to half of the capacity, and the air compressor is powered on for operation;

[0096] Calibration signal check: Check the signals of the vertical bending moment and torsional moment measurement points of the test ship model to ensure normal signal transmission;

[0097] Change the water volume: Control the air compressors corresponding to the water storage tanks S3, S4, S5, and S6 respectively to reduce the air pressure in the water storage tanks S4 and S5, so that the mass of the water entering the water storage tanks S4 and S5 from the external water pool is m r1 ; Increase the air pressure in the water storage tanks S3 and S6, so that the mass of the water discharged from the water storage tanks S3 and S6 to the external water pool is m r1; wherein, the change in the mass of water in each water storage tank is calculated from the water level signal collected by the water level sensor; the vertical distance between the water storage tanks S3 and S4 is the same as the horizontal distance between the water storage tanks S5 and S6, both being H;

[0098] Record the strain signal: After the water level in the water storage tank is stable, record the strain signal ε at this time r1 . At this time, the force state of the ship model is as Figure 4 shown, the vertical shear force value is Q = m r1 g, and the vertical bending moment is T = m r1 gH;

[0099] Reload: Continue to reduce the gas pressure in the water storage tanks S4 and S5 so that the total mass of the water entering from the external water tank into the water storage tanks S4 and S5 is both m r2 ; continue to increase the gas pressure in the water storage tanks S3 and S6 so that the total mass of the water discharged from the water storage tanks S3 and S6 to the external water tank is both m r2 ; after the water level in each water storage tank is stable, record the strain signal ε at this time r2 . At this time, the force state of the ship model is as Figure 4 shown, the vertical shear force value is Q = m r2 g, and the vertical bending moment is T = m r2 gL;

[0100] Gradually load: Repeat step 5 until the water in the water storage tanks S4 and S5 fills the entire container, and the loading process is completed;

[0101] Unload: After the loading is completed, control the air extractors corresponding to the water storage tanks S3, S4, S5, and S6 respectively, increase the gas pressure in the water storage tanks S4 and S5 so that the water storage tanks S4 and S5 discharge water to the external water tank, and the total mass change of the water storage tanks S4 and S5 is m r3 ; reduce the gas pressure in the water storage tanks S3 and S6 so that the water storage tanks S3 and S6 receive water from the external water tank, and the total mass change of the water storage tanks S3 and S6 is m r3 ; after the water level in the water storage tank is stable, record the strain signal ε at this time 3 . At this time, the force state of the ship model is as Figure 4 shown, the vertical shear force value is Q = m r3 g, and the vertical bending moment is T = m r3 gH;

[0102] Gradually unload: Repeat step 7 until the water in the water storage tanks S3, S4, S5, and S6 is the same as the initial state, and the calibration of the negative torque load is completed;

[0103] Data analysis: Based on the above steps, record the strain vs. corresponding torque load curves under each strain gauge, and perform data analysis to obtain the calibration coefficients of each strain gauge.

[0104] The present invention calibrates the ship model under different types of loads (sagging bending moment, hogging bending moment, positive torque, negative torque), which can comprehensively evaluate the structural response and performance of the ship model under various working conditions.

[0105] It is convenient to understand the structural deformation, stress distribution, and possible failure modes of the ship model when it is subjected to loads of different directions and magnitudes.

[0106] Through calibration, the safety margin of the ship model when it is subjected to the ultimate load can be determined, that is, the maximum load that the ship model can withstand without exceeding its structural strength limit, ensuring the safety of the ship model during actual use and providing reliable data support for its application in complex environments.

[0107] At the same time, the calibration results can provide important references for the load calculation, structural design, and optimization of the ship model in actual applications.

[0108] By understanding the performance of the ship model under different loads, its behavior during actual use can be predicted more accurately, thus ensuring its safe and efficient operation.

[0109] In summary, multiple calibrations are of great significance for comprehensively evaluating the performance of the ship model, verifying the design accuracy, determining the safety margin, and providing references for actual applications. By calibrating the ship model under different loads, its structural response and performance can be understood more comprehensively, providing strong support for the design, optimization, and application of the ship model.

[0110] The above description is an explanation of the present invention, not a limitation of the invention. The scope defined by the present invention is referred to the claims, and any form of modification can be made within the protection scope of the present invention.

Claims

1. A load calibration device for an integral elastic ship model, characterized in that: include: Strain sensors are arranged in the stress-bearing areas of the ship model such as the deck, bottom plate, and side strakes to monitor the strain changes of the ship model; A plurality of water storage tanks are arranged on the upper deck of the ship model, and the tank body is fixed to the beam below by bolt connection, and an air guide pipe is arranged on the top and a water pipe is arranged on the bottom, which is used to apply vertical bending moment and torque load by changing the water volume; An air pipe, one end of which is connected to the air vent of the water tank, and the other end is connected to the air pump, for transmitting and controlling the air pressure in the water tank; A water pipe, one end of which is placed at the bottom of the water storage tank and the other end is placed below the water surface of the test pool to allow water to flow between the water storage tank and the pool; An air pump is connected to the water tank through an air pipe and is used to control the air pressure in the water tank, thereby adjusting the amount of water in the water tank; The water level sensor is installed on the inner wall of the water storage tank and is used to monitor and record the water level in the water storage tank in real time to calculate the quality of the water.

2. The load calibration device for an integral elastic ship model according to claim 1 is characterized in that: The tank body of the water storage tank is arranged at the upper deck crossbeam of the ship model's transverse frame to ensure that the water storage tank will not affect the local strength of the overall ship model.

3. The load calibration device for an integral elastic ship model according to claim 1 is characterized in that: Each of the water storage tanks is provided with an air vent connected to an air guide pipe, and the air guide pipe connects the air pump and the water storage tank.

4. The load calibration device for an integral elastic ship model according to claim 1, characterized in that: The water level sensor can monitor and record the amount of water in the water storage tank in real time to assist in calculating the mass of the liquid in the water storage tank.

5. A method for calibrating loads of an integral elastic ship model, characterized in that: The integral elastic ship model load verification device according to claim 1 comprises the following steps: (a) Prepare the equipment: connect the water level sensors of the water storage tanks to the data acquisition system, adjust the water volume in each water storage tank to half of its capacity, and start the air pump; (b) Check the signal: check the vertical bending moment and torsional bending moment measuring point signals of the test ship model to ensure that the signal transmission is normal; (c) Changing the water volume: By controlling the air pump, the air pressure in a specific water tank is adjusted to change the water volume in the water tank, thereby applying a vertical bending moment or torque load; (d) Recording the strain signal: After the water level in the water storage tank is stable, record the strain signal at this time; (e) Gradual loading and unloading: repeating steps (c) and (d) to gradually increase or decrease the amount of water in the water storage tank until a predetermined loading or unloading state is reached; (f) Data analysis: Based on the recorded strain signals and the corresponding vertical bending moments or torque loads, data analysis is performed to obtain the calibration coefficients of each strain gauge.

6. The method for calibrating loads of an integral elastic ship model according to claim 5, characterized in that: In step (c), the discharge or entry of water is controlled by increasing the gas pressure or decreasing the gas pressure in the water storage tank.

7. The method for calibrating loads of an integral elastic ship model according to claim 5, characterized in that: The method also includes specific steps for calibrating the sagging bending moment load, in which the sagging bending moment is applied by controlling the change of water volume in a specific water storage tank; the calibrating the sagging bending moment load includes a stepwise loading and unloading process, and a strain signal is recorded after each loading or unloading.

8. The method for calibrating loads of an integral elastic ship model according to claim 5, characterized in that: Also included are specific steps for calibrating the hogging moment load, in which the hogging moment is applied by controlling the change in water volume in a specific water storage tank.

9. The method for calibrating loads of an integral elastic ship model according to claim 5, characterized in that: The invention also includes specific steps for calibrating positive and negative torque loads, wherein the torque load is applied by controlling the change of water volume in the water tanks on both sides of the ship model; During the calibration of torque and vertical bending moment loads, the buoyancy of the ship model did not change. It was just that the internal force was applied to the ship model by changing the mass distribution on board.

10. The method for calibrating loads of an integral elastic ship model according to claim 9, characterized in that: The data analysis step includes recording the strain under each strain gauge and the corresponding vertical bending moment or torque load curve, and obtaining the calibration coefficient of each strain gauge through data analysis.

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