Towing tank two-ship supply working condition stress test device and signal measurement method

Abstract

The invention relates to a towing tank two-ship supply working condition stress test device and a signal measurement method, the towing tank two-ship supply working condition stress test device comprises an upper panel and a lower panel which are vertically distributed at an interval, the upper panel and the lower panel have the same structure and are oppositely mounted, and symmetrical end plates and side coamings are mounted between the upper panel and the lower panel, so that a hollow tetragonal structure is formed; a limiting cylinder is fixed in the upper panel, a limiting shaft is fixed on the upper surface of the lower panel, and the limiting cylinder and the limiting shaft are mutually matched and clamped; lateral force balances are fixed on the lower panel at the single side coaming through fasteners, the two lateral force balances are distributed diagonally, a first flexible connecting rod is mounted on the single lateral force balance in a matched manner, and the first flexible connecting rod is locked with the upper panel through a fastener; a resistance balance is fixed on the lower panel at the end plate through a fastener, a second flexible connecting rod is mounted on the resistance balance in a matched manner, and the second flexible connecting rod is locked with the upper panel through a fastener; a plurality of vertical flexible supporting rods are further installed between the upper panel and the lower panel.

Description

Technical Field

[0001] The invention relates to the technical field of ship dynamics test devices, in particular to a force test device for a two-ship replenishment working condition in a towing tank and a signal measurement method. Background Art

[0002] Marine replenishment refers to a marine operation activity that uses various replenishment equipment to replenish materials and transfer personnel to ships at sea. It is usually carried out by using replenishment ships to replenish ships sailing and operating at sea, and to supply various supplies required for normal duty of ships. It is an important part of marine logistics support, and its purpose is to improve the survivability, maneuverability and sustained combat capability of ships at sea. In order to improve the safety and stability of replenishment during ship navigation, it is necessary to conduct in-depth research on the hydrodynamic characteristics of two ships in the state of siding and replenishment, and provide technical support for replenishment decision-making and ship navigation control.

[0003] At present, the water tanks in the prior art (including towing water tanks, wavekeeping water tanks and maneuverability water tanks) are basically used to carry out relevant hydrodynamic performance tests on single models. The test equipment and test methods are also for single models. The two-degree-of-freedom or four-degree-of-freedom test instruments are large in size and cannot be used for parallel tests of two ships in indoor water tanks. In addition, the ship model that needs to be replenished is large in size and has a heavy draft. Due to the structural strength of the towing device, the towing acceleration cannot be too large. Although the speed of the two ships is low in the replenishment state, the small acceleration still leads to a long acceleration range during the test, even if the test is carried out in a towing water tank. It is also a big challenge; the force measuring device basically uses the strain gauge method. For multi-channel signal acquisition, there are mainly two methods: direct acquisition using a strain acquisition card or single-channel acquisition after conditioning through a signal amplifier. The strain acquisition card solution has the advantages of simple wiring, small number of equipment required, and small footprint. However, it has its own low excitation voltage accuracy, resulting in poor output signal accuracy, and does not have analog signal filtering function. The fatal flaw is poor on-site anti-interference ability. The signal amplifier solution requires an amplifier for each channel, which is costly, occupies a large area, requires many steps of manual participation in the setting, and is extremely prone to errors. Summary of the invention

[0004] In view of the problems in the above-mentioned existing production technology that the towing inertia force borne by the force measuring device during the acceleration and deceleration stages is more than ten times greater than the force (resistance) in the towing direction of the ship model under the low-speed stable state, and that obtaining multi-channel strain balance signals cannot take into account high precision, low cost, fewer operating steps and site occupancy, the applicant provides a force test device for a two-ship replenishment condition in a towing tank and a signal measurement method, thereby providing a three-component box balance (resistance, lateral force and yaw moment) with protection in the towing direction and a multi-channel strain balance signal acquisition method.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A force test device for the two - ship replenishment condition in a towing tank, comprising an upper panel and a lower panel which are spaced apart vertically. The structures of the upper panel and the lower panel are the same and they are installed oppositely. Symmetrical end plates and side enclosures are installed between the upper panel and the lower panel, thus forming a hollow cube structure. A limiting cylinder is fixed inside the upper panel, and a limiting shaft is fixed on the upper surface of the lower panel. The limiting cylinder and the limiting shaft are engaged and clamped with each other. A lateral force balance is fixed on the lower panel at a single side enclosure through fasteners. The two lateral force balances are distributed diagonally. A first flexible link is installed in cooperation with a single lateral force balance, and the first flexible link is locked with the upper panel through fasteners. A drag balance is fixed on the lower panel at the end plate through fasteners. A second flexible link is installed in cooperation with the drag balance, and the second flexible link is locked with the upper panel through fasteners. A plurality of vertical flexible support rods are also installed between the upper panel and the lower panel.

[0007] Its further technical solution lies in:

[0008] A plurality of threaded holes are arranged on both the upper panel and the lower panel.

[0009] The upper panel is connected to the mechanical interface of the model towing device.

[0010] The lower panel is connected to the mechanical interface of the ship model.

[0011] Four vertical flexible support rods are fixed at the four corners between the upper panel and the lower panel through fasteners to support the upper panel.

[0012] The cross - section of the side enclosure is in an arc structure.

[0013] A shaft hole for installing the limiting shaft is opened on the lower panel.

[0014] The first flexible link and the second flexible link have the same structure. The structure of the first flexible link is: including a rectangular block, a long circular hole is opened on the rectangular block, one end of the rectangular block extends outwards into a strip - shaped structure. The strip - shaped structure includes a cylindrical section, a first groove and a second groove are symmetrically opened on both sides of the cylindrical section, and a connecting section is arranged at the end.

[0015] The structure of the vertical flexible support rod is: an upper positioning part and a lower positioning part. An upper positioning hole is opened on the upper positioning part, a lower positioning hole is opened on the lower positioning part, and a plurality of pits are arranged between the upper positioning part and the lower positioning part.

[0016] A signal measurement method for a force test device for the two - ship replenishment condition in a towing tank, comprising the following operation process:

[0017] The stable excitation voltage for multiple resistance balances and lateral force balances can be achieved by one or a few high-precision linear power supplies with low ripple noise characteristics. An analog voltage signal acquisition card with a 24-bit resolution, supporting differential signals and having an anti-aliasing filtering function built into the acquisition board is used to collect the mV-level voltage signals output by the Wheatstone circuit in the strain gauges on the balance. The acquisition card performs oversampling according to the set sampling frequency. The analog filter built into the anti-aliasing module filters out most of the high-frequency analog signals. A small number of escaped noise signals will not cause aliasing interference to the concerned low-frequency signals under the oversampling mechanism. Then, the analog signal is digitized and transmitted to the measurement and control software running on the computer. Finally, under the action of the digital filter, a small number of noise interference signals that are not filtered out by the analog filter can be removed, that is, high-quality sampling of the analog voltage signal can be achieved through differential signal sampling, anti-aliasing filtering function and oversampling mechanism.

[0018] The beneficial effects of the present invention are as follows:

[0019] The structure of the present invention is compact and reasonable, and it is convenient to operate. It has a unique design structure of a three-component force box balance for measuring the forces on a ship model in a replenishment state and a high-precision measurement method for multiple voltage signals. The device realizes the accurate measurement of the forces related to the ship model under large acceleration / deceleration conditions, solves the difficulty of the conflict between large inertia loads and small-range loads in the steady state, and the proposed split mode of strain gauge excitation input and signal output reduces the cost, simplifies the operation process, and improves the reliability of the test.

[0020] The present invention designs two sets of limit protection devices to protect the multi-component force balance body and the core force-measuring balance, so that the small-range force-measuring balance designed for low-load test purposes can meet the test requirements of large acceleration / deceleration towing conditions. Combining Newton's first law, this balance is also applicable to large-scale model tests.

[0021] The present invention designs anti-interference devices at different positions, which not only improves the sensitivity of the force-measuring units in relevant directions but also improves the anti-interference ability of the force-measuring units.

[0022] The present invention uses a single high-precision DC power supply to provide the excitation power for the strain gauges on multiple force-measuring balances, replacing the strain acquisition card and signal amplifier scheme. On the premise of ensuring the accuracy of the excitation power supply, it reduces the cost, simplifies the operation process of personnel intervention, improves the test efficiency, and enhances the test stability; a 24-bit resolution analog voltage acquisition card with anti-aliasing characteristics is used to collect mV-level small-range voltage signals, and an on-board hardware filter is used to perform pre-filtering on the analog signal, effectively ensuring the sampling quality of the voltage signal.

[0023] The present invention introduces a large inertial force protection device in the drag direction on the three-component force box balance body, enabling the design of the balance load to only consider the small load range in the steady state, resulting in a good match between the designed range and the used range, and effectively ensuring the test accuracy of the balance itself.

[0024] The present invention adopts a design scheme of eliminating interference for key components, ensuring that the balance has good sensitivity and that the measuring unit has good anti-interference effects against forces in other directions.

[0025] The large inertial force protection device designed on the balance body of the present invention can enable a relatively high drag acceleration during the test process, thereby reducing the distance in the acceleration and deceleration intervals and lowering the requirements for the effective test length of the drag pool. It can be used for large-scale models, making this three-component force box balance highly versatile in drag pools of different scales.

[0026] The present invention integrates the large inertial force protection device in the drag direction on the three-component force box balance body. On the premise of controlling the volume of the box balance within a small range, it can effectively reduce the design complexity of the two-ship drag device, reduce the size of the two-ship drag device, and lower the requirements for the on-site space layout of the drag pool trailer.

[0027] The present invention adopts a mode of separating the strain gauge excitation input and signal output, ensuring signal accuracy, streamlining the number of devices, reducing costs, simplifying operation steps, and reducing the human error rate.

[0028] The present invention is applicable to measuring the forces on two ship models in the state of two-ship alongside replenishment in a drag pool, and can also be extended to measuring the forces on a single ship model in the single working state, and relates to a method for measuring the forces on a ship model under hydrodynamic action and signal acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of the present invention.

[0030] Figure 2 is an exploded view of the present invention.

[0031] Figure 3 is a schematic structural diagram of the present invention (omitting the upper panel).

[0032] Figure 4 is a top view of the present invention.

[0033] Figure 5 is a schematic structural diagram of the side enclosure panel of the present invention.

[0034] Figure 6 is a schematic structural diagram of the lower panel of the present invention.

[0035] Figure 7It is a schematic structural diagram of another perspective of the lower panel of the present invention.

[0036] Figure 8 It is a schematic structural diagram of the limit cylinder and the limit shaft of the present invention.

[0037] Figure 9 It is an installation schematic diagram of the limit cylinder and the limit shaft of the present invention.

[0038] Figure 10 It is a schematic structural diagram of the lateral force balance of the present invention.

[0039] Figure 11 It is a schematic structural diagram of another perspective of the lateral force balance of the present invention.

[0040] Figure 12 It is a schematic structural diagram of the first flexible link of the present invention.

[0041] Figure 13 It is a schematic structural diagram of the vertical flexible support rod of the present invention.

[0042] Figure 14 It is a schematic diagram of the principle of the signal measurement method of the present invention.

[0043] Wherein: 1. Upper panel; 2. End plate; 3. Side enclosure; 4. Limit cylinder; 5. Vertical flexible support rod; 6. Lateral force balance; 7. First flexible link; 8. Limit shaft; 9. Second flexible link; 10. Lower panel; 11. Drag balance;

[0044] 501. Upper positioning part; 502. Upper positioning hole; 503. Concave pit; 504. Lower positioning part; 505. Lower positioning hole;

[0045] 701. Rectangular block; 702. Long circular hole; 703. First groove; 704. Cylindrical section; 705. Second groove; 706. Connection section;

[0046] 1001. Shaft hole. Specific embodiments

[0047] The following combines the drawings to illustrate the specific embodiments of the present invention.

[0048] Such as Figures 1-14As shown in the figure, the force test device for the two-ship replenishment condition in a towing tank according to this embodiment includes an upper panel 1 and a lower panel 10 that are spaced apart vertically. The upper panel 1 and the lower panel 10 have the same structure and are installed opposite to each other. Symmetric end plates 2 and side enclosures 3 are installed between the upper panel 1 and the lower panel 10, thus forming a hollow cube structure; a limiting cylinder 4 is fixed inside the upper panel 1, and a limiting shaft 8 is fixed on the upper surface of the lower panel 10. The limiting cylinder 4 and the limiting shaft 8 are engaged and clamped with each other; a lateral force balance 6 is fixed on the lower panel 10 at a single side enclosure 3 through fasteners. The two lateral force balances 6 are distributed diagonally. A first flexible link 7 is installed in cooperation with a single lateral force balance 6, and the first flexible link 7 is locked with the upper panel 1 through fasteners; a drag balance 11 is fixed on the lower panel 10 at the end plate 2 through fasteners. A second flexible link 9 is installed in cooperation with the drag balance 11, and the second flexible link 9 is locked with the upper panel 1 through fasteners; a plurality of vertical flexible support rods 5 are also installed between the upper panel 1 and the lower panel 10.

[0049] A plurality of threaded holes are arranged on both the upper panel 1 and the lower panel 10.

[0050] The upper panel 1 is connected to the mechanical interface of the model towing device.

[0051] The lower panel 10 is connected to the mechanical interface of the ship model.

[0052] The four vertical flexible support rods 5 are fixed at the four corners between the upper panel 1 and the lower panel 10 through fasteners to support the upper panel 1.

[0053] The cross-section of the side enclosure 3 is in an arc structure.

[0054] A shaft hole 1001 for installing the limiting shaft 8 is opened on the lower panel 10.

[0055] The first flexible link 7 and the second flexible link 9 have the same structure. The structure of the first flexible link 7 is: including a rectangular block 701, a long circular hole 702 is opened on the rectangular block 701. One end of the rectangular block 701 extends outward into a long strip structure. The long strip structure includes a cylindrical section 704. A first groove 703 and a second groove 705 are symmetrically opened on both sides of the cylindrical section 704, and a connection section 706 is provided at the end.

[0056] The structure of the vertical flexible support rod 5 is: an upper positioning part 501 and a lower positioning part 504. An upper positioning hole 502 is opened on the upper positioning part 501, a lower positioning hole 505 is opened on the lower positioning part 504, and a plurality of pits 503 are arranged between the upper positioning part 501 and the lower positioning part 504.

[0057] The specific structure and function of the force test device for the two-ship replenishment condition in a towing tank according to the present invention are as follows:

[0058] As shown Figure 4 in the figure, the X direction is the towing direction, the reverse direction is the resistance direction, the Y direction is the lateral force direction, and the torque around the Z axis is the yaw moment.

[0059] It mainly includes a resistance balance 11 and a lateral force balance 6.

[0060] The two resistance balances 11 are arranged diagonally, and the two lateral force balances 6 are arranged diagonally.

[0061] A first flexible link 7 is installed on the lateral force balance 6, and a second flexible link 9 is installed on the resistance balance 11. The structures of the first flexible link 7 and the second flexible link 9 are the same, and they are respectively fixed on the side panel 3 and the end panel 2 through fasteners.

[0062] An upper panel 1 and a lower panel 10 are respectively arranged above and below, and the structures of the upper panel 1 and the lower panel 10 are the same.

[0063] There are ten threaded holes on the surface of the upper panel 1, which serve as mechanical interfaces for connecting with the model towing device during the test.

[0064] There are ten threaded holes on the surface of the lower panel 10, which serve as mechanical interfaces for connecting with the ship model during the test.

[0065] Four vertical flexible support rods 5 are respectively fixed to the upper panel 1 and the lower panel 10 through socket head cap screws, playing a role in supporting the upper panel 1. In terms of structural strength, it can cope with the situation of the change in the lift / buoyancy along the Z direction caused by the heave attitude of the ship model under the action of hydrodynamic force during towing. In addition, the vertical flexible support rods 5 are designed such that part of the middle section is designed to be flat along the X and Y directions, making the vertical flexible support rods 5 have weaker stiffness along the resistance and lateral force directions and having less influence on the sensitivity of the resistance and lateral force.

[0066] The collimation of the resistance balance 11 and the lower panel 10 is effectively controlled by a positioning pin. The resistance balance 11 is fastened to the lower panel 10 by countersunk head screws. One end of the second flexible link 9 is fixed to the upper panel 1 by a socket head cap screw, and the other end passes through the resistance balance 11 and is locked with a nut. The resistance balance 11 adopts a double "S" beam structure with strong anti-interference ability. Since the load of this balance is small, 7075 aluminum alloy is used to improve the sensitivity.

[0067] There are two drag balances 11 in total. During the test, the drag load causes relative displacement between the upper panel 1 and the lower panel 10 in the X direction. As a result, the upper panel 1 pulls the drag balance 11 through the second flexible link 9, deforming the structure of the drag balance 11, causing the full-bridge resistance value in the drag strain gauge pasted on the surface to change, and outputting a corresponding voltage signal. By synthesizing the voltage signals output by the two drag balances 11 and the previous calibration coefficient, the corresponding drag value can be obtained. The second flexible link 9 adopts a similar structure to the vertical flexible support rod 5, and part of the middle section is designed to be flat along the Y and Z directions (see Figure 10 ), which can release the forces in the Z and Y directions to a certain extent, reduce the interference to the drag balance 11, and use the weakened X-direction stiffness to protect the drag balance 11 (the second flexible link 9 breaks first when encountering a large load).

[0068] Correspondingly, the working mode of the lateral force balance 6 is similar to that of the drag balance 11. It adopts a double "S" beam structure and the material is 7075 aluminum alloy. The lateral force load causes relative displacement between the upper panel 1 and the lower panel 10 in the Y direction. As a result, the lower panel 10 pulls the lateral force balance 6 through the first flexible link 7, deforming the structure of the lateral force balance 6, causing the full-bridge resistance value in the lateral force strain gauge pasted on the surface to change, and outputting a corresponding voltage signal. By synthesizing the voltage signals output by the two lateral force balances 6 and the previous calibration coefficient, the corresponding lateral force value can be obtained.

[0069] Through the drag value, lateral force value and calibration coefficient, the yaw moment value can be obtained.

[0070] The limit cylinder 4 is fixed in the upper panel 1 by screws, and the limit shaft 8 is fixed in the lower panel 10 by screws 17. The limit shaft 8 is inserted into the interior of the limit cylinder 4. In the interference area between the two, the shaft diameter of the limit shaft 8 is slightly smaller than the inner diameter of the limit cylinder 4 of the upper panel (generally, a deviation of 1 mm can be designed). This design can ensure that the displacement distance between the upper panel 1 and the lower panel 10 in the X direction is limited under a large drag acceleration, thus protecting the main structure of the three-component force box balance, the drag balance 11 and the lateral force balance 6.

[0071] The limit pin adopts a two-stage design with different diameters (the difference in the two diameters is small, generally, a deviation of 1 mm can be designed), and is inserted into the two separation blocks of the drag balance 11 and the lateral force balance 6, which can directly protect the balance body when bearing large loads in the X and Z directions.

[0072] The side enclosure 3 protects the internal structure and strain gauges of the three-component force box balance, avoiding physical impact or water splashing.

[0073] Select the Keysight DC power supply (model E36102B) to provide the excitation voltage for the multi-channel resistance strain gauges and lateral force strain gauges, which is generally set to 5V. The strain gauges adopt a full-bridge Wheatstone circuit. The NIPXIe-4302 data acquisition card collects the output voltage of the full-bridge Wheatstone circuit, with a resolution of 24 bits. The range of the data acquisition card can be set. Select the 100mV range gear to match the mV-level voltage signal output by the strain gauges. The data acquisition card has an anti-aliasing filtering function. Among them, the on-board analog filter can filter out high-frequency interference signals under the oversampling mechanism. The cut-off frequency of the on-board digital filter on the data acquisition card can be directly set using software. The data acquisition card sends the collected discrete data to the computer through the bus, reducing the performance requirements for computer-side filtering while ensuring the quality of the sampling signal.

[0074] The main part of the three-component balance box is composed of two panels, a vertical support rod, a resistance element, a lateral force element, a flexible connecting rod and a load limit component. The upper panel 1 is connected to the towing mechanism on the towing pool trailer, and the lower panel 10 is fixed to the ship model. The upper panel 1 and the lower panel 10 bear the vertical load through the vertical flexible support rod 5. During the test, the ship model connected to the lower panel 10 has a position offset relative to the towing device of the upper panel, and the deformation of the resistance element / lateral force element is converted into an electrical signal, enabling the measurement of the resistance, lateral force and yaw moment of the ship model.

[0075] The present invention designs a disturbance elimination device to improve the sensitivity of the balance and also enhance the anti-interference ability of the balance.

[0076] The present invention utilizes the load limit component on the three-component balance box to protect the resistance measurement unit during the acceleration and deceleration phases of the test, preventing large inertial forces from directly acting on the resistance measurement element.

[0077] The present invention connects the excitation voltage signal line of the multi-channel strain balance to the Keysight DC power supply (model E36102B), and the output signal of the strain balance is connected to the NIPXIe-4302 data acquisition card. The anti-aliasing filtering provided by this data acquisition card is used to filter and collect the voltage signal of the strain gauges.

[0078] During the actual working process:

[0079] A test scheme for separating power supply and sampling is implemented for a balance that measures force / moment using a strain gauge with a Wheatstone circuit deployed. By using one or a few high-precision linear power supplies with the characteristic of low ripple noise, a stable excitation voltage can be provided to multiple resistance balances 11 and lateral force balances 6. An analog voltage signal acquisition card with a 24-bit resolution, supporting differential signals and having an anti-aliasing filtering function built in the acquisition board is used to collect the mV-level voltage signals output by the Wheatstone circuit in the strain gauge on the balance. The acquisition card performs oversampling according to the set sampling frequency. The analog filter built in the anti-aliasing module will filter out most of the high-frequency analog (interference property) signals. A small part of the escaped noise signals will not cause aliasing interference to the concerned low-frequency signals under the oversampling mechanism. Then the analog signal is digitized and transmitted to the measurement and control software running on the computer. Finally, under the action of the digital filter, a small part of the noise interference signals that are not filtered by the analog filter can be eliminated, that is, high-quality sampling of the analog voltage signal can be achieved through differential signal sampling, anti-aliasing filtering function and oversampling mechanism.

[0080] Compared with the scheme of integrating excitation and signal acquisition, the present invention can ensure a more stable excitation voltage, make the output voltage generated by the strain gauge more stable and accurate, and improve the data quality. Compared with the scheme of conditioning signals with an external amplifier, the present invention can significantly reduce intermediate devices, reduce costs, and reduce the usage site. More importantly, it can avoid misoperation of the hardware setting buttons and greatly reduce the error probability caused by human intervention.

[0081] 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. Within the protection scope of the present invention, any form of modification can be made.

Claims

1. A towing tank two-ship replenishment working condition stress test device, characterized by: The invention comprises an upper panel (1) and a lower panel (10) which are spaced apart from each other. The upper panel (1) and the lower panel (10) have the same structure and are installed relative to each other. A symmetrical end plate (2) and a side panel (3) are installed between the upper panel (1) and the lower panel (10), thereby forming a hollow cubic structure. A limiting cylinder (4) is fixed inside the upper panel (1), and a limiting shaft (8) is fixed on the upper surface of the lower panel (10). The limiting cylinder (4) and the limiting shaft (8) are mutually engaged and clamped. The lower panel (10) located at a single side panel (3) is fixed by a fastener. A lateral force balance (6) is provided, and two lateral force balances (6) are diagonally distributed. A flexible connecting rod (7) is installed on each lateral force balance (6), and the flexible connecting rod (7) is locked with the upper panel (1) through a fastener. A resistance balance (11) is fixed on the lower panel (10) located at the end plate (2) through a fastener, and a flexible connecting rod (9) is installed on the resistance balance (11), and the flexible connecting rod (9) is locked with the upper panel (1) through a fastener. A plurality of vertical flexible support rods (5) are also installed between the upper panel (1) and the lower panel (10).

2. A towing tank two-ship replenishment working condition stress test device as claimed in claim 1, characterized in that: A plurality of threaded holes are arranged on the upper panel (1) and the lower panel (10).

3. A towing tank two-ship replenishment working condition stress test device as claimed in claim 1, characterized in that: The upper panel (1) is connected to a mechanical interface connected to a model towing device.

4. A towing tank two-ship replenishment working condition stress test device as claimed in claim 1, characterized in that: The lower panel (10) is connected to a mechanical interface connected to the ship model.

5. A towing tank two-ship replenishment working condition stress test device as claimed in claim 1, characterized in that: Four vertical flexible support rods (5) are fixed at four corners between the upper panel (1) and the lower panel (10) by fasteners to support the upper panel (1).

6. A towing tank two-ship replenishment working condition stress test device as claimed in claim 1, characterized in that: The cross section of the side panel (3) is an arc structure.

7. A towing tank two-ship replenishment working condition stress test device as claimed in claim 1, characterized in that: The lower panel (10) is provided with an axis hole (1001) for installing the limiting axis (8).

8. A towing tank two-ship replenishment working condition stress test device as claimed in claim 1, characterized in that: The structure of the first flexible link (7) and the second flexible link (9) is the same. The structure of the first flexible link (7) is as follows: it includes a rectangular block (701), the rectangular block (701) is provided with an oblong hole (702), one end of the rectangular block (701) extends outwardly to form a long strip structure, the long strip structure includes a cylindrical section (704), the cylindrical section (704) is symmetrically provided with a first groove (703) and a second groove (705) on both sides, and a connecting section (706) is provided at the end.

9. A towing tank two-ship replenishment working condition stress test device as claimed in claim 1, characterized in that: The structure of the vertical flexible support rod (5) is: an upper positioning portion (501) and a lower positioning portion (504); an upper positioning hole (502) is formed on the upper positioning portion (501); a lower positioning hole (505) is formed on the lower positioning portion (504); and a plurality of pits (503) are provided between the upper positioning portion (501) and the lower positioning portion (504).

10. A signal measurement method for a towing tank two-ship replenishment working condition stress test device, characterized in that: The following operation procedures are included: A single or a few high-precision linear power supplies with low ripple noise characteristics can provide a stable output excitation voltage for multi-channel resistance balances and lateral force balances; an analog voltage signal acquisition card with 24-bit resolution, support for differential signals and built-in anti-aliasing filtering function on the acquisition board is used to acquire the MV-level voltage signal output by the Wheatstone circuit in the strain gauge on the balance. The acquisition card implements oversampling according to the set sampling frequency. The analog filter of the anti-aliasing module will filter out most of the high-frequency analog signals. A small amount of escaped noise signals will not form aliasing interference to the low-frequency signals of interest under the oversampling mechanism. The analog signal is then digitized and passed to the measurement and control software running on the computer. Finally, the small amount of noise interference signals that are not filtered out by the analog filter can be eliminated under the action of the digital filter. That is, high-quality sampling of analog voltage signals can be achieved through differential signal sampling, anti-aliasing filtering function and oversampling mechanism.

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