Sealing pressure-bearing gravity type water tunnel comprehensive testing device and testing method thereof

Abstract

The application provides a sealed pressure-bearing gravity type water tunnel comprehensive testing device and a testing method thereof, and belongs to the technical field of ship and ocean engineering testing. The device solves the problems of size limitation of a model, difficulty in disassembly and assembly, and difficulty in simultaneously carrying out comprehensive physical quantity measurement such as vibration acceleration, fluctuating pressure and radiation noise of a conventional gravity type water tunnel. The device comprises a water tunnel working section, a sealed pressure-bearing water tank, a test piece structure and a flow regulation structure. The top end of the water tunnel working section is provided with a water tunnel cover plate. The sealed pressure-bearing water tank is arranged on the top of the water tunnel cover plate and connected with the water tunnel working section through the water tunnel cover plate. A rectangular hollow part is arranged in the center of the water tunnel cover plate. The test piece structure is arranged on the rectangular hollow part of the water tunnel cover plate in an inclined mode. The rear end of the test piece structure is connected with the flow regulation structure. The top end surface of the flow regulation structure is connected with the bottom end surface of the water tunnel cover plate. The device is mainly used for comprehensive testing of a gravity type water tunnel.

Description

Technical Field

[0001] This invention belongs to the field of ship and marine engineering testing technology, and in particular relates to a sealed pressure-bearing gravity water tunnel integrated testing device and its testing method. Background Technology

[0002] Plate and shell structures are widely used in underwater vehicles and surface vessels, and generally form an angle with the incoming flow direction. However, testing existing vibration and noise levels during actual navigation and comparing the effects with those of plate and shell structures of different thicknesses, materials, and layerings throughout the entire process of ship design, construction, and maintenance is time-consuming, requires significant manpower and resources, and has a long research cycle, resulting in low efficiency. Due to the large size of the hull, flow-induced noise tests on partial ship specimen models in a laboratory environment, providing a similar reverberation environment, can measure the surface pulsating pressure, vibration acceleration response, and radiated noise. This allows for the analysis of the magnitude and transmission patterns of ship flow-induced vibration and noise, providing guidance for reducing ship flow-induced noise, improving sonar detection range, enhancing stealth, and improving navigation safety.

[0003] Gravity water tunnels are devices primarily used for testing and researching hydrodynamic structures such as propellers, thrusters, and irregularly shaped structures. They consist of an upper water tank, a lower water pool, a piping system, a working section, a reverberation chamber, and various valves to control flow velocity. During water tunnel testing, water is pumped into the upper water tank beforehand, and the gravity flow velocity is controlled by a combination of valve opening and closing.

[0004] In traditional gravity-type water tunnel flow-torsion testing, a dedicated frame must be designed for each specimen model without disassembling the working section, resulting in poor reusability. Furthermore, due to the size limitations of the traditional cover openings in the water tunnel working section, the model size is generally small, making it difficult to simultaneously measure vibration acceleration, pulsating pressure, and radiated noise. There is an urgent need to develop a flow-torsion testing device with greater space utilization and flexible specimen model replacement, while also meeting the extreme working environment of high head and high impact force in gravity water tunnels and fulfilling the comprehensive vibration and noise testing requirements. Summary of the Invention

[0005] In view of this, the present invention aims to propose a comprehensive testing device and testing method for a sealed pressure-bearing gravity water tunnel, in order to solve the problems of existing traditional gravity water tunnels having size limitations on the model, difficulty in disassembly and assembly, and difficulty in simultaneously measuring comprehensive physical quantities such as vibration acceleration, pulsating pressure, and radiated noise.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a sealed pressure-bearing gravity-type water tunnel comprehensive testing device, comprising a water tunnel working section, a sealed pressure-bearing water tank, a specimen structure, and a rectification structure. The top of the water tunnel working section is provided with a water tunnel cover plate, the sealed pressure-bearing water tank is located on top of the water tunnel cover plate and connected to the water tunnel working section through the water tunnel cover plate, a rectangular hollow is provided in the center of the water tunnel cover plate, the specimen structure is inclinedly arranged in the rectangular hollow of the water tunnel cover plate, the rear end of the specimen structure is connected to the rectification structure, and the top surface of the rectification structure is connected to the bottom surface of the water tunnel cover plate.

[0007] Furthermore, the top of the sealed pressure tank is provided with a tank end cap.

[0008] Furthermore, the water tank end cap is provided with a cable collection hole, and the cable collection hole is provided with a cable cover.

[0009] Furthermore, four fixed angle steels are provided on the inner wall of the sealed pressurized water tank, and the four corners of the top surface of the specimen structure are respectively connected to the four fixed angle steels by screws.

[0010] Furthermore, the bottom front end of the specimen structure is flush with the bottom surface of the water tunnel cover, and the bottom rear end of the specimen structure is flush with the bottom of the rectifying structure.

[0011] Furthermore, the lower surface cross-section of the rectifying structure is a streamlined structure.

[0012] Furthermore, multiple accelerometer bases are evenly spaced in a rectangular arrangement on the upper surface of the specimen structure, and accelerometer sensors are connected to the accelerometer bases.

[0013] Furthermore, the specimen structure is provided with a plurality of mounting holes at uniform intervals, and a pulsating pressure sensor is installed in each mounting hole.

[0014] Furthermore, the sealed pressurized water tank is equipped with several hydrophones, which are suspended inside the sealed pressurized water tank by auxiliary supports.

[0015] This invention also provides a testing method for a sealed, pressure-bearing gravity-type integrated testing device for water tunnels, which includes the following steps:

[0016] Step 1: Sensor placement: Suspend the hydrophone in the sealed pressurized water tank at the designated position, and use brackets, knots, etc. to help position and fix it. The accelerometer is screwed and fixed to the accelerometer base that is pre-attached to the inner surface of the model. The pulsating pressure sensor is fixed in the mounting hole with glue. Bundle the cables into a bundle, pass them through the cable collection hole in advance, and fix them through the cable cover.

[0017] Step 2: Assemble the test device: Adjust the bottom front end of the specimen structure to be flush with the bottom surface of the water tunnel cover plate, and the bottom rear end of the specimen structure to be flush with the bottom of the rectifying structure. Fill the specimen with rubber pads and watertight adhesive around its perimeter, dry it, and then fill it with water to check its watertight performance. Move the sealed pressure tank and the specimen structure as a whole to the upper side of the working section using a crane in the laboratory. Place the watertight rubber gasket, slowly lower the model, and accurately place it in the designated position in the working section. Remove the temporarily connected nuts, and connect the sealed pressure tank, the water tunnel working section, and the water tunnel cover plate simultaneously with bolts through the threaded holes. After confirming that everything is correct, fix the water tank end cap to the lower end cap, connect the water tunnel cover plate and the sealed pressure tank with bolts, and tighten the cable cover. Fill the gaps with rubber blocks and glass glue.

[0018] Step 3: Assemble and debug the testing system: Connect the sensors and measuring instruments, data acquisition instruments and computer, etc., according to their numbers and channels. Recheck the instrument connections and verify the normality of each signal. If a line signal is abnormal, check the line connectors and grounding until all faults are eliminated and the line signal is normal. The test data is transmitted to the computer through the sampling system. The accelerometer sensor processes the collected vibration signal through the accelerometer signal conditioner and transmits it to the signal acquisition unit. The hydrophone collects the noise signal, processes it through the signal conditioner, and then through the transducer power amplifier before transmitting it to the signal acquisition unit. All test results are processed and analyzed on the computer terminal.

[0019] Step 4: Start the test: Adjust the flow rate in the working section of the water tunnel using the gravity-type water tunnel valve control console. After the flow rate monitored by the gravity-type water tunnel control console stabilizes, observe whether the readings of each channel show a periodic pattern. Use data acquisition instruments and supporting testing software to continuously collect pulsating pressure, vibration acceleration, and noise data for at least 30 seconds. To ensure the accuracy and reliability of the test results and eliminate test errors caused by system errors and human operation, repeat the test three times.

[0020] Step 5: Adjust the flow rate: Replenish the water in the upper water tank, and use the control console to adjust the valve opening and closing combination to control the gravity flow speed of the water. After the flow rate monitored by the gravity water tunnel control console stabilizes, observe whether the readings of each channel show a periodic pattern. Use data acquisition instruments and supporting testing software to continuously collect pulsating pressure, vibration acceleration and noise data for at least 30 seconds.

[0021] Step 6: Replace the test specimen: Turn off the control console and temporarily close the valve. Directly remove the cable cover, sealed pressurized water tank, hydrophone, accelerometer, and pulsating pressure sensor in sequence on the working section of the water tunnel. Temporarily place them in an open area to dry. Use a crane to temporarily remove the water tunnel cover plate and the connected rectifier structure and test specimen structure. After drying, replace the test specimen structure, reassemble and seal it, and carry out the test.

[0022] Step 7: End of test: Adjust the flow velocity in the working section of the water tunnel to 0. After the water flow in the working section of the water tunnel stops, turn off the flow velocity control system and slowly empty the water tank.

[0023] Step 8: Disassemble the test device: Loosen the connection between the sealed pressurized water tank and the working section of the water tunnel, use a crane to move the entire structure to a temporary support, and disassemble and install the cable cover, water tank end cover and sealed pressurized water tank in sequence.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. This invention provides a sealed, pressure-bearing gravity-type water tunnel integrated testing device. By cutting a local, full-scale specimen of a ship's hull with a fixed width and length, a gravity-type water tunnel is used to simulate the impact of stable, high-speed water flow. Vibration acceleration sensors, hydrophones, and pulsating pressure sensors are used to collect flow-induced response data. While maintaining a consistent width and length, different materials, thicknesses, coatings, or paint layers can be easily replaced with different specimen structures. Furthermore, the flow-facing angle of the specimen can be customized according to actual needs, providing a convenient and effective experimental method for studying the flow-induced vibration and internal field radiated noise characteristics of shell plates under different flow velocities and property parameters.

[0026] 2. The device of the present invention has strong reusability and stable material properties. Compared with the original working section cover structure, the space utilization rate in the width direction is increased from less than 40% to 99%, and the opening in the length direction is increased by 300%, which meets the requirements for comprehensive physical quantity testing of vibration and noise.

[0027] 3. The components of the device of this invention are all relatively thick and have a large number of connecting bolts. It has been verified that it can meet the requirements of 20m static head and 10m / s flow velocity impact ballast, providing a reliable and effective test method for gravity water tunnel testing. Attached Figure Description

[0028] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0029] Figure 1 This is a schematic diagram of the overall structure of a sealed pressure-bearing gravity-type integrated testing device for water tunnels according to the present invention;

[0030] Figure 2 This is a cross-sectional schematic diagram of the structure of a sealed pressure-bearing gravity-type integrated testing device for water tunnels according to the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the water tunnel cover plate in the sealed pressure-bearing gravity water tunnel integrated testing device of the present invention;

[0032] Figure 4 This is a schematic diagram of the sealed pressurized water tank in a sealed pressurized gravity-type water tunnel integrated testing device according to the present invention;

[0033] Figure 5 This is a schematic diagram of the water tank end cap in a sealed, pressure-bearing gravity-type integrated testing device for water tunnels according to the present invention.

[0034] Figure 6 This is a schematic diagram of the cable cover in a sealed, pressure-bearing gravity-type integrated testing device for water tunnels according to the present invention;

[0035] Figure 7 This is a schematic diagram of the specimen structure in the sealed pressure-bearing gravity-type water tunnel integrated testing device of the present invention;

[0036] Figure 8 This is a schematic diagram of the rectifying structure in a sealed, pressure-bearing gravity-type integrated testing device for water tunnels according to the present invention.

[0037] Figure 9 This is a schematic diagram of the fixed angle steel structure in a sealed, pressure-bearing gravity-type integrated testing device for water tunnels according to the present invention;

[0038] Figure 10 This is a schematic diagram of the water flow direction in the working section of a sealed pressure-bearing gravity-type water tunnel integrated testing device according to the present invention.

[0039] 1-Water tunnel working section, 2-Sealed pressure tank, 3-Specimen structure, 4-Rectifying structure, 5-Water tunnel cover plate, 6-Water tank end cover, 7-Gathering hole, 8-Cable cover, 9-Fixing angle steel, 10-Screw, 11-Acceleration sensor, 12-Mounting hole, 13-Pulsating pressure sensor, 14-Hydrophone. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0041] See Figure 1-10This embodiment describes a sealed, pressure-bearing gravity-type water tunnel comprehensive testing device, which includes a water tunnel working section 1, a sealed pressure-bearing water tank 2, a specimen structure 3, and a rectification structure 4. The top of the water tunnel working section 1 is provided with a water tunnel cover plate 5. The sealed pressure-bearing water tank 2 is located on top of the water tunnel cover plate 5 and is connected to the water tunnel working section 1 through the water tunnel cover plate 5. A rectangular hollow is provided in the center of the water tunnel cover plate 5. The specimen structure 3 is inclinedly arranged in the rectangular hollow of the water tunnel cover plate 5. The rear end of the specimen structure 3 is connected to the rectification structure 4, and the top surface of the rectification structure 4 is connected to the bottom surface of the water tunnel cover plate 5.

[0042] This embodiment provides a sealed, pressure-bearing gravity-type water tunnel integrated testing device. By cutting a local, full-scale specimen of a ship's hull with a fixed width and length, a stable, high-speed water flow impact is simulated through a gravity-type water tunnel. Vibration acceleration sensor 11, hydrophone 14, and pulsating pressure sensor 13 are used to collect flow-induced response data. While maintaining a consistent fixed width and length, different materials and thicknesses of specimen structures can be easily replaced, and the flow-facing angle of the specimen can be customized according to actual needs.

[0043] In this embodiment, the water flow direction is forward, such as... Figure 10 As shown, Figure 10 The direction of the middle arrow indicates the direction of water flow.

[0044] The sealant used in this embodiment is a watertight sealant.

[0045] In this embodiment, the working section 1 of the water tunnel is part of a gravity water tunnel, consisting of an upper water tank, a lower water pool, a piping system, a working section, a reverberation chamber, and various valves for controlling flow velocity. During the water tunnel test, water needs to be pumped to the upper water tank for storage beforehand, and the gravity flow velocity of the water is controlled by a combination of valve opening and closing. Structural vibration and noise testing can be performed at a certain flow velocity in the working section 1 of the water tunnel. The left and right sides of the working section 1 of the water tunnel are glass baffles, and water flows in the front and back directions.

[0046] In this embodiment, the sealed pressurized water tank 2 is filled with static water to simulate the actual working state of a typical ship structure. That is, both the upper and lower surfaces of the test specimen structure 3 are in contact with water. The upper surface is in contact with still water, and the lower surface is in contact with flowing water. Furthermore, a hydrophone 14 can be installed inside the test specimen structure 3 as needed to measure the underwater noise induced by structural vibration inside the test specimen structure 3.

[0047] In this embodiment, the gravity-type water tunnel working section needs to withstand a maximum static pressure of 20m water head and high-speed impact force. Since water is an incompressible fluid, the pressure of the water tunnel working section 1 will be transmitted to the upper sealed pressure tank 2 through the specimen structure 3. Therefore, the sealed pressure tank 2 is required to have good pressure bearing characteristics.

[0048] In this embodiment, the top of the sealed pressure water tank 2 is provided with a water tank end cap 6.

[0049] In this embodiment, the water tank end cover 6 is provided with a cable collection hole 7, and the cable collection hole 7 is provided with a cable cover 8. After the cables of the acceleration sensor 11 and the pulsating pressure sensor 13 are bundled together, they are passed through the cable collection hole 7 in the center of the water tank end cover 6 and fixed by the cable cover 8.

[0050] In this embodiment, four fixed angle steels 9 are provided on the inner wall of the sealed pressure water tank 2. The four corners of the top surface of the specimen structure 3 are connected to the four fixed angle steels 9 by screws 10 respectively. The specimen structure 3 is connected to the fixed angle steels 9 on the inner wall of the sealed pressure water tank 2 by screws 10, thereby realizing the fixation between the specimen structure 3 and the sealed pressure water tank 2.

[0051] In this embodiment, the bottom front end of the specimen structure 3 is flush with the bottom surface of the water tunnel cover plate 5, and the bottom rear end of the specimen structure 3 is flush with the bottom of the rectifying structure 4.

[0052] In this embodiment, the lower surface cross-section of the rectifying structure 4 is a streamlined structure. The rectifying structure 4 guides the water flow away from the rear of the specimen structure 3 with a smooth streamline shape, avoiding the adverse effects of turbulent vortices such as flow separation and backflow caused by structural transitions on the measurement.

[0053] In this embodiment, a groove is provided at the front end face of the rectifier structure 4, which is used to facilitate the test personnel to put their hands into the groove to install screws when installing the rectifier structure 4.

[0054] In this embodiment, multiple accelerometer bases are evenly spaced on the upper surface of the specimen structure 3. An accelerometer 11 is connected to the accelerometer base and is used to collect the vibration acceleration of the surface of the specimen structure 3.

[0055] In this embodiment, a plurality of mounting holes 12 are evenly spaced on the specimen structure 3. A pulsating pressure sensor 13 is installed in the mounting hole 12. The pulsating pressure sensor 13 is used to collect the pulsating pressure load of the flow field of the specimen structure 3.

[0056] In this embodiment, a plurality of hydrophones 14 are installed inside the sealed pressure water tank 2. The hydrophones 14 are suspended inside the sealed pressure water tank 2 by auxiliary supports. The hydrophones 14 are used to measure and collect the noise induced by structural vibration of the test specimen structure 3.

[0057] In this embodiment, the components of the sealed pressure-bearing gravity water tunnel integrated testing device need to be installed in a certain order. During the sensor installation stage, the water tunnel cover plate 5 and the sealed pressure-bearing water tank 2 are first temporarily fixed with bolts and nuts. Temporary supports are installed around the device in a suspended state under laboratory conditions to ensure its stability and reliability. After installation, the rectifying structure 4 is fixed below the water tunnel cover plate 5. Lines are drawn on the upper surface of the specimen structure 3 according to the design spacing. The plexiglass accelerometer base is then attached. The specimen structure 3 is connected to the fixing angle steel 9 on the inner wall of the sealed pressure-bearing water tank 2 with screws 10, and the nuts on both sides are tightened. The bottom front end of the specimen structure 3 is adjusted to be flush with the bottom surface of the water tunnel cover plate 5, and the bottom rear end of the specimen structure 3 is flush with the bottom end of the rectifying structure 4. The specimen is then secured with rubber. After the rubber gaskets and watertight sealant are dried, water is poured in to check their watertightness. The sealed pressurized water tank 2 and the test specimen structure 3 are hoisted and moved to the upper side of the working section by a crane in the laboratory. Watertight rubber gaskets are placed, and the model is slowly lowered so that it is accurately placed in the designated position in the working section. The temporary connecting nuts are removed, and the threaded holes are connected to the sealed pressurized water tank 2, the water tunnel working section 1 and the water tunnel cover plate 5 through bolts. After the watertight sealant dries, static water is injected into the working section and left to stand for a certain period of time to check for leakage. Further waterproofing work is carried out. The cables of the accelerometer 11 and the pulsating pressure sensor 13 are bundled together and passed through the center of the cable hub 7 and the cable cover 8 in advance. The hydrophone 14 is fixed on the auxiliary support and passed through the center of the cable cover 8 for later use. After ensuring the structural connections and waterproofing are correct, hoist the water tank end cap 6 onto the fixture. Pass the pre-prepared cable cover 8 and sensor cable bundle through the cable management hole 7 of the water tank end cap 6. Suspend the hydrophone 14 in the sealed pressurized water tank 2 at the designated position, using brackets, knots, etc. for auxiliary positioning and fixation. Tighten the accelerometer 11 to the accelerometer base pre-attached to the inner surface of the model. Glue the pulsating pressure sensor 13 through and fix it in the mounting hole 12. After confirming everything is correct, fix the water tank end cap 6 to the sealed pressurized water tank 2. Connect the water hole cover 5 to the sealed pressurized water tank 2 with bolts, and tighten the cable cover 8. Fill any gaps with rubber blocks and silicone sealant. The model fixture is now fully installed.

[0058] The sealed pressure-bearing gravity water tunnel integrated testing device described in this embodiment is simple and effective. It can flexibly adjust the parameters such as the structural material and thickness of the specimen according to research needs, providing a convenient and effective test method for studying the flow-induced vibration and internal field radiated noise characteristics of ship composite shell plates.

[0059] This embodiment also provides a testing method for a sealed, pressure-bearing gravity-type integrated testing device for water tunnels, which includes the following steps:

[0060] Step 1: Sensor placement: Suspend the hydrophone 14 in the sealed pressurized water tank 2 at the designated position, and use brackets, knots, etc. to help position and fix it. The accelerometer 11 is screwed and fixed to the accelerometer base that is pre-attached to the inner surface of the model. The pulsating pressure sensor 13 is fixed to the mounting hole 12 with glue. The cables are bundled together and pre-passed through the cable collection hole 7 and fixed through the cable cover 8.

[0061] Step 2: Assemble the test device: Adjust the bottom front end of the specimen structure 3 to be flush with the bottom surface of the water tunnel cover plate 5, and the bottom rear end of the specimen structure 3 to be flush with the bottom of the rectifying structure 4. Fill the specimen with rubber pads and watertight glue around it, dry it, and then fill it with water to check its watertight performance. Move the sealed pressure water tank 2 and the specimen structure 3 as a whole to the upper side of the working section by lifting it with a crane in the laboratory. Place the watertight rubber gasket, slowly lower the model, and make it fall accurately in the designated position in the working section. Remove the temporarily connected nuts, and connect the sealed pressure water tank 2, the water tunnel working section 1 and the water tunnel cover plate 5 through bolts. After confirming that there are no errors, fix the water tank end cover 6 on the lower end cover, connect the water tunnel cover plate 5 and the sealed pressure water tank 2 with bolts, and tighten the cable cover 8. Fill the gaps with rubber blocks and glass glue.

[0062] Step 3: Assemble and debug the testing system: Connect the sensors and measuring instruments, data acquisition instruments and computer, etc., according to their numbers and channels. Recheck the instrument connections and verify the normality of each signal. If the line signal is abnormal, check the line connectors and grounding until all faults are eliminated and the line signal is normal. The test data is transmitted to the computer through the sampling system. The accelerometer 11 processes the collected vibration signal through the accelerometer signal conditioner and transmits it to the signal acquisition unit. The hydrophone 14 processes the collected noise signal through the signal conditioner, then through the transducer power amplifier and transmits it to the signal acquisition unit. All test results are processed and analyzed on the computer terminal.

[0063] Step 4: Start the test: Adjust the flow rate in the working section 1 of the water tunnel using the gravity-type water tunnel valve control console. After the flow rate monitored by the gravity-type water tunnel control console stabilizes, observe whether the readings of each channel show a periodic pattern. Use data acquisition instruments and supporting testing software to continuously collect pulsating pressure, vibration acceleration, and noise data for at least 30 seconds. To ensure the accuracy and reliability of the test results and eliminate test errors caused by system errors and human operation, the test generally needs to be repeated three times.

[0064] Step 5: Adjust the flow rate: Replenish the water in the upper water tank, and use the control console to adjust the valve opening and closing combination to control the gravity flow speed of the water. After the flow rate monitored by the gravity water tunnel control console stabilizes, observe whether the readings of each channel show a periodic pattern. Use data acquisition instruments and supporting testing software to continuously collect pulsating pressure, vibration acceleration and noise data for at least 30 seconds.

[0065] Step 6: Replace the test specimen: Turn off the control console and temporarily close the valve. Directly remove the cable cover, sealed pressure tank 2, hydrophone 14, acceleration sensor 11, and pulsating pressure sensor 13 in sequence on the working section 1 of the water tunnel. Temporarily place them in an open area to dry. Use a crane to temporarily remove the water tunnel cover plate 5 and the connected rectifier structure 4 and test specimen structure 3. After drying, replace the test specimen structure 3, reassemble and seal it, and carry out the test.

[0066] Step 7: End of test: Adjust the flow velocity in working section 1 of the water tunnel to 0. After the water flow in working section 1 of the water tunnel stops, turn off the flow velocity control system and slowly empty the water tank.

[0067] Step 8: Disassemble the test device: Loosen the connection between the sealed pressure water tank 2 and the working section 1 of the water tunnel, use a crane to move the entire structure to the temporary support, and disassemble the cable cover 8, the water tank end cover 6 and the sealed pressure water tank 2 in sequence.

[0068] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A sealed, pressure-bearing gravity-type integrated testing device for water tunnels, characterized in that: It includes a water tunnel working section (1), a sealed pressurized water tank (2), a specimen structure (3), and a rectification structure (4). A water tunnel cover plate (5) is installed at the top of the water tunnel working section (1). The sealed pressurized water tank (2) is located on top of the water tunnel cover plate (5) and connected to the water tunnel working section (1) via the water tunnel cover plate (5). A rectangular cutout is provided in the center of the water tunnel cover plate (5). The specimen structure (3) is inclinedly positioned at the rectangular cutout on the water tunnel cover plate (5). The rear end of the specimen structure (3) is connected to the rectification structure (4). The top surface of the rectification structure (4) is connected to the bottom surface of the water tunnel cover plate (5). Four fixed angle steels (9) are installed on the inner wall of the sealed pressurized water tank (2). The top surface of the specimen structure (3)... At each of the four corners, screws (10) are connected to four fixed angle steels (9). The bottom front end of the specimen structure (3) is flush with the bottom surface of the water tunnel cover plate (5). The bottom rear end of the specimen structure (3) is flush with the bottom of the rectifying structure (4). Multiple acceleration sensor bases are evenly spaced in a rectangular arrangement on the upper surface of the specimen structure (3). An acceleration sensor (11) is connected to the acceleration sensor base. Multiple mounting holes (12) are evenly spaced on the specimen structure (3). A pulsating pressure sensor (13) is installed in the mounting hole (12). Several hydrophones (14) are installed in the sealed pressurized water tank (2). The hydrophones (14) are suspended in the sealed pressurized water tank (2) by auxiliary brackets.

2. The sealed pressure-bearing gravity-type comprehensive testing device for water tunnels according to claim 1, characterized in that: The top of the sealed pressure water tank (2) is provided with a water tank end cap (6).

3. The sealed, pressure-bearing gravity-type comprehensive testing device for water tunnels according to claim 2, characterized in that: The water tank end cap (6) is provided with a cable collection hole (7), and the cable collection hole (7) is provided with a cable cover (8).

4. The sealed, pressure-bearing gravity-type comprehensive testing device for water tunnels according to claim 1, characterized in that: The lower surface cross-section of the rectifier structure (4) is a streamlined structure.

5. A testing method for a comprehensive testing device for a sealed, pressure-bearing gravity-type water tunnel according to claim 3, characterized in that: It includes the following steps: Step 1: Sensor setup: Suspend the hydrophone (14) in the sealed pressurized water tank (2) at the designated position, and fix it with the help of brackets or rope knots. The accelerometer (11) is screwed and fixed to the accelerometer base. The pulsating pressure sensor (13) is fixed in the mounting hole (12) with glue. Bundle the cables into a bundle, pass them through the cable collection hole (7) in advance and fix them through the cable cover (8). Step 2: Assemble the test device: Adjust the bottom front end of the specimen structure (3) to be flush with the bottom surface of the water tunnel cover plate (5), and the bottom rear end of the specimen structure (3) to be flush with the bottom of the rectifying structure (4). Fill the specimen with rubber pads and watertight adhesive around it, dry it, and then fill it with water to check its watertight performance. Move the sealed pressurized water tank (2) and the specimen structure (3) together to the upper side of the water tunnel working section (1) using a crane in the laboratory. Place the watertight rubber gasket and slowly lower the sealed pressurized water tank. (2) and the whole of the specimen structure (3) are placed accurately in the designated position in the working section (1) of the water tunnel. Remove the temporarily connected nut, and connect the sealed pressure water tank (2), the working section (1) of the water tunnel and the water tunnel cover plate (5) through the threaded hole with bolts. After confirming that there is no error, fix the end cover (6) of the water tank to the upper end of the sealed pressure water tank (2), connect the water tunnel cover plate (5) and the sealed pressure water tank (2) with bolts, and tighten the cable cover (8). Fill the gap with rubber blocks and glass glue. Step 3: Assemble and debug the test device: Connect the sensor and measuring instrument, the acquisition instrument and the computer according to the number and channel, check the instrument connection again, check whether the signal of each channel is normal, if the line signal is not normal, check the line connector and the line grounding until all faults are eliminated and the line signal is normal. The test data is transmitted to the computer through the sampling system. The accelerometer (11) processes the collected vibration signal through the accelerometer signal conditioner and transmits it to the signal acquisition device. The hydrophone (14) processes the collected noise signal through the signal conditioner, and transmits it to the signal acquisition device through the transducer and power amplifier. All test results are processed and analyzed in the computer terminal. Step 4: Start the test: Use the gravity-type water tunnel valve control console to adjust the flow rate in the working section (1) of the water tunnel. After the flow rate monitored by the gravity-type water tunnel valve control console stabilizes, observe whether the readings of each channel show a periodic pattern. Use the data acquisition instrument and supporting test software to continuously collect pulsating pressure, vibration acceleration and noise data for at least 30 seconds. To ensure the accuracy and reliability of the test results and eliminate test errors caused by system errors and human operation, repeat the test three times. Step 5: Adjust the flow rate: Replenish the water in the sealed pressurized water tank (2), and use the gravity water tunnel valve control console to adjust the valve opening and closing combination to control the gravity flow speed of the water. After the flow rate monitored by the gravity water tunnel valve control console is stable, observe whether the readings of each channel show a periodic pattern. Use data acquisition instruments and supporting testing software to continuously collect pulsating pressure, vibration acceleration and noise data for at least 30 seconds. Step 6: Replace the test specimen: Close the gravity-type water tunnel valve control console, temporarily close the valve, and directly remove the cable cover, sealed pressure tank (2), hydrophone (14), acceleration sensor (11), and pulsating pressure sensor (13) in sequence on the working section (1) of the water tunnel. Place them temporarily in an open area to dry. Use a crane to temporarily remove the water tunnel cover plate (5) and the connected rectifier structure (4) and test specimen structure (3). After drying, replace the test specimen structure (3), reassemble and seal it, and carry out the test. Step 7: End of test: Adjust the flow velocity in the working section (1) of the water tunnel to 0. After the water flow in the working section (1) of the water tunnel stops, close the gravity water tunnel valve control console and slowly drain the water in the sealed pressure tank (2). Step 8: Disassemble the test device: Loosen the connection between the sealed pressure water tank (2) and the working section of the water tunnel (1), use a crane to move the entire structure to the temporary support, and disassemble the cable cover (8), the water tank end cover (6) and the sealed pressure water tank (2) in sequence.

Images