A LNG carrier containment system structure slamming pressure measurement system

Abstract

This invention belongs to the field of engineering testing technology and discloses a slamming pressure measurement system for an LNG ship containment system. It includes a test model with several detection components and a protective component at the top. Each detection component includes a protective cylinder inside the test model, containing a pressure sensor connected to the outside environment. The protective cylinder includes a base and a top cover within the test model's interior, with an axial positioning sleeve between the base and top cover. The pressure sensor is located within the axial positioning sleeve and fixed to the base, with its connecting wire passing through the top cover and extending out of the axial positioning sleeve. This invention features a simple structure, ease of use, and comprehensive assessment of the fluid slamming load on the containment system. It offers convenient installation, good watertightness, reduced risk of malfunction and damage, and facilitates direct observation and assessment of the internal conditions of the test model, simplifying preparation and maintenance during testing.

Description

Technical Field

[0001] This invention belongs to the field of engineering testing technology, and in particular relates to a slamming pressure measurement system for the containment system of an LNG ship. Background Technology

[0002] LNG carriers, as one of the main methods of daily natural gas transportation, are the only remaining optimal option for many countries and regions. The cryogenic liquefaction tanks of LNG carriers are crucial for ensuring transportation efficiency and safety. To ensure that the cryogenic liquefaction tanks have good seismic resistance and thermal insulation while not occupying too much liquid tank volume, LNG carriers currently mostly use membrane-type cargo containment systems. The construction process of LNG carrier containment systems is complex and costly, and the failure of the containment system can have serious consequences. Therefore, it is often necessary to determine the performance of the containment system through testing before construction.

[0003] As a typical internal structure of a liquid tank, the containment system is inevitably subjected to impact loads from sloshing liquids. These impact loads often have high peak values ​​and short durations, posing a risk of failure to the containment system. Due to the high cost and risk of full-scale ship testing, and the complexity of the containment system's internal structure, model testing is often used to address these issues. However, there are currently few patented technologies specifically for assessing the impact resistance and measuring the impact pressure of containment systems.

[0004] Therefore, in order to solve the above-mentioned technical problems, this application designs an LNG ship containment system structure impact pressure measurement system to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a slamming pressure measurement system for the containment system of an LNG ship.

[0006] To achieve the above objectives, the present invention provides a slamming pressure measurement system for the containment system of an LNG ship, comprising a test model, wherein a plurality of detection components are provided on the test model, and a protective component is provided at the top of the test model;

[0007] The detection component includes a protective cylinder disposed between the upper and lower ends of the inner cavity of the test model, and a pressure sensor is disposed inside the protective cylinder, with the top end of the pressure sensor extending out of the top end of the protective cylinder;

[0008] The protective cylinder includes a base disposed at the bottom end of the inner cavity of the test model and a top cover disposed at the top end of the inner cavity of the test model, and an axial positioning sleeve is disposed between the base and the top cover;

[0009] The pressure sensor is located inside the axial positioning sleeve and is fixedly connected to the base. The connecting wire of the pressure sensor passes through the top cover and extends out of the axial positioning sleeve.

[0010] Preferably, the base includes an internally threaded flange disposed at the bottom of the inner cavity of the test model, the bottom end of the axial positioning sleeve is fixedly connected to the internally threaded flange, and the bottom end of the pressure sensor is threadedly connected to the top end of the internally threaded flange.

[0011] Preferably, the bottom of the test model is provided with a lower end cover, which is limitedly connected to the internal threaded flange.

[0012] Preferably, the top cover includes a positioning weld block fixed to the top of the test model, an adjustment plate fixed to the top of the positioning weld block, an upper end cover fixed to the top of the adjustment plate, the top of the axial positioning sleeve passing through the positioning weld block and the adjustment plate in sequence and abutting against the bottom of the upper end cover, and the connecting wire of the pressure sensor passing through the upper end cover and sealed.

[0013] Preferably, the top end of the positioning welding block is fixedly connected to two assembled pin plates, and the two pin plates are arranged around the axial positioning sleeve; one end of the pin plate facing the axial positioning sleeve is fixedly connected to a protruding locking pin, and the locking pin is engaged and fixed in the pin hole on the axial positioning sleeve.

[0014] Preferably, the test model includes a rectangular cavity enclosed by composite plates, a back plate is sealed and fixed between the top ends of the composite plates, and a corrugated plate is fixed between the bottom ends of the composite plates; the top cover is fixed to the top cover, and the base is fixed to the corrugated plate.

[0015] Preferably, the protective component includes a side guard plate that is attached and fixed to the composite plate, and a protective edge is provided between the edge of the side guard plate and the edge of the test model.

[0016] Preferably, the edge protection includes a corrugated plate edge protection, a back plate edge protection, a composite layer edge protection, and corner protection surrounding the edge of the side guard plate; the corrugated plate edge protection is disposed between the side guard plate and the corrugated plate, the back plate edge protection is disposed between the back plate and the side guard plate, and the composite layer edge protection is disposed between the side guard plate and the side edge of the composite layer.

[0017] Preferably, a sealing strip is provided between several side guards fixed to the same side of the composite plate.

[0018] Compared with existing technologies, this invention has the following advantages and technical effects: This invention discloses a slamming pressure measurement system for an LNG ship containment system. It uses a test model to simulate the LNG ship maintenance system, and the internal detection components measure the slamming pressure on the structure. The pressure sensor arrangement method of the detection components can effectively collect slamming pressure data from the test model under different test conditions. Based on the results collected by the pressure sensors, a comprehensive assessment of the fluid slamming load on the containment system can be performed. During the installation of the detection components, the pressure sensors and the protective cylinder are first assembled into a module, and then the entire module is fixed in the designed position on the test model. The installation process is convenient and the connection is secure. The system is reliable and has good waterproof capabilities, reducing the risk of water ingress damage during testing. The entire module also has good rigidity, and the backplate of the test model can limit the large displacement of the pressure sensor when subjected to fluid impact, thus ensuring the accuracy of pressure measurements. The protective components prevent water ingress into the test model during testing, which could affect the normal operation of the sensor and the mass of the test model itself. In test conditions involving tilted immersion in water, it can also effectively prevent additional damage to the sides of the test model. It allows direct observation and assessment of the internal condition of the test model, facilitating preparation and maintenance during testing, and also avoids excessive impact on the mass distribution and rigidity of the test model.

[0019] This invention has a simple structure and is easy to use. It can comprehensively evaluate the fluid impact load on the enclosure system. It is easy to install, has good water tightness, reduces the risk of failure and damage, facilitates direct observation and judgment of the internal conditions of the test model, and facilitates preparation and maintenance work during the test process. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is an exploded view of the slamming pressure measurement of the LNG ship containment system structure according to the present invention;

[0022] Figure 2 This is an exploded view of the detection component of the present invention;

[0023] Figure 3 This is a schematic diagram of the detection component structure of the present invention;

[0024] Figure 4 This is a diagram showing the arrangement of the pressure sensor of the present invention;

[0025] In the diagram: 1. Test model; 2. Pressure sensor; 3. Internal threaded flange; 4. Axial positioning sleeve; 5. Positioning weld block; 6. Pin plate; 7. Adjusting plate; 8. Upper end cover; 9. Bolt; 10. Lower end cover; 11. Side guard plate; 12. Corrugated plate edge protector; 13. Back plate edge protector; 14. Sealing strip; 15. Composite layer edge protector; 16. Corner protector. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figures 1-4 As shown, this embodiment provides a slamming pressure measurement system for the containment system of an LNG ship, including a test model 1, on which several detection components are provided, and a protective component is provided at the top of the test model 1;

[0029] The detection assembly includes a protective cylinder disposed between the upper and lower ends of the inner cavity of the test model 1, and a pressure sensor 2 disposed inside the protective cylinder, with the top end of the pressure sensor 2 extending out of the top end of the protective cylinder;

[0030] The protective sleeve includes a base at the bottom of the inner cavity of the test model 1 and a top cover at the top of the inner cavity of the test model 1, and an axial positioning sleeve 4 is provided between the base and the top cover;

[0031] The pressure sensor 2 is located inside the axial positioning sleeve 4 and is fixed to the base. The connecting wire of the pressure sensor 2 passes through the top cover and extends out of the axial positioning sleeve 4.

[0032] This invention discloses a slamming pressure measurement system for an LNG carrier containment system. A test model 1 simulates the LNG carrier's containment system, and an internal detection component measures the slamming pressure on the structure. The arrangement of the pressure sensors 2 within the detection component effectively collects slamming pressure data from the test model 1 under different test conditions. Based on the results collected by the pressure sensors 2, a comprehensive assessment of the fluid slamming load on the containment system can be performed. During installation, the pressure sensors 2 and the protective cylinder are first assembled into a module, and then the entire module is fixed in the designed position on the test model 1. The installation process is convenient, the connection and fixation are reliable, and it has good waterproof performance. The force reduces the risk of water ingress damage during the test. At the same time, the entire module has good rigidity and the back plate of the test model 1 can limit the large displacement of the pressure sensor 2 when it is hit by fluid, thereby ensuring the accuracy of the pressure measurement results. The protective components can prevent water from entering the test model 1 during the test, which would affect the normal operation of the sensor and the mass of the test model 1 itself. In the test condition of tilting into the water, it can also effectively prevent additional damage to the side of the test model 1. It can directly observe and judge the internal condition of the test model 1, which is convenient for the preparation and maintenance work during the test. It can also avoid excessive impact on the mass distribution and rigidity of the test model 1.

[0033] Furthermore, in this embodiment, the impact pressure of the enclosure system structure is measured and the impact resistance of the enclosure system structure is evaluated through a water drop test. During the test, the bottom of the test model 1 comes into contact with the fluid first, so the pressure sensor 2 is installed at the bottom of the test model 1. The test considers water drop at different angles, and the test model 1 will be submerged in water during the test. Therefore, the protection and waterproofing of the test model 1 need to be considered to ensure the safety of the internal detection components.

[0034] Furthermore, the axial positioning sleeve 4 is made of high-hardness impact-resistant PC plastic, and the lower end cap 10 is made of impact-resistant ABS plastic. This ensures both strength and hardness while avoiding excessive self-mass from affecting the mass distribution and structural response of the test model 1.

[0035] Furthermore, the experiment considers fluid impact loads under different action angles, so detection components need to be arranged in the length, width and diagonal directions of the test model 1.

[0036] The design is further optimized. The base includes an internally threaded flange 3 located at the bottom of the inner cavity of the test model 1. The bottom end of the axial positioning sleeve 4 is fixed to the internally threaded flange 3. The bottom end of the pressure sensor 2 is threadedly connected to the top end of the internally threaded flange 3. A lower end cover 10 is provided at the bottom of the test model 1, and the lower end cover 10 is connected to the internally threaded flange 3 for limiting. The internally threaded flange 3 is fixed to the bottom of the inner cavity of the test model 1, and the bottom end of the pressure sensor 2 is threadedly connected to the internally threaded flange 3 to position and fix the pressure sensor 2. At the same time, the axial positioning sleeve 4 is sealed and bonded to the internally threaded flange 3. Waterproof adhesive is applied to the connection to ensure airtightness, so as to ensure that the pressure sensor 2 will not undergo large displacement when subjected to fluid impact, thus affecting the measurement results.

[0037] Furthermore, the lower end cap 10 is fixed to the bottom end face of the test model 1 by bonding, and the connection needs to be sealed with waterproof glue.

[0038] The design is further optimized. The top cover includes a positioning welded block 5 fixed to the top of the test model 1. An adjustment plate 7 is fixed to the top of the positioning welded block 5, and an upper end cover 8 is fixed to the top of the adjustment plate 7. The top of the axial positioning sleeve 4 passes through the positioning welded block 5 and the adjustment plate 7 in sequence and abuts against the bottom of the upper end cover 8 for fixation. The connection wire of the pressure sensor 2 passes through the upper end cover 8 and is sealed. The positioning welded block 5 is welded to the top surface of the test model 1. The adjustment plate 7 and the upper end cover 8 are fixed in sequence by bolts 9. The axial positioning sleeve 4 is positioned by passing through the through hole in the middle of the positioning welded block 5 and the adjustment plate 7, and then is fixed by pressing down from the bottom of the upper end cover 8 to fix the axial positioning sleeve 4.

[0039] Furthermore, the connecting wire of the pressure sensor 2 passes through the guide hole of the upper end cover 8, and then glue is applied between the connecting wire and the guide hole to seal it, so as to prevent water from entering the axial positioning sleeve 4 when the test model 1 falls into the water.

[0040] In a further optimized design, two interlocking pin plates 6 are fixed to the top of the positioning welding block 5, and the two pin plates 6 are arranged around the axial positioning sleeve 4. A protruding locking pin is fixed to one end of the pin plate 6 facing the axial positioning sleeve 4, and the locking pin engages and is fixed in a pin hole on the axial positioning sleeve 4. In this embodiment, the pin plate 6 is a ring-shaped block divided into two halves, positioned between the positioning welding block 5 and the adjusting plate 7. The bolt 9 passes through the pin plate 6 and is screwed into the positioning welding block 5 to achieve positioning. A protruding locking pin is provided on the side of the ring-shaped block facing the axial positioning sleeve 4, and a pin hole adapted to the locking pin is provided on the axial positioning sleeve 4, thereby pinning and fixing the axial positioning sleeve 4, achieving axial fixation of the axial positioning sleeve 4, thus improving the stability of the axial positioning sleeve 4, preventing shaking under impact, and improving the protection of the pressure sensor 2.

[0041] Further optimizing the design, test model 1 includes a rectangular cavity enclosed by composite panels. A back plate is sealed and fixed between the top ends of several composite panels, and a corrugated plate is fixed between the bottom ends of several composite panels. A top cover is fixed to the top cover, and a base is fixed to the corrugated plate. Test model 1 is a box-shaped structure, with its perimeter enclosed by composite panels forming a rectangular structure. The top ends are sealed by a back plate, and the bottom ends are sealed by a corrugated plate. Adhesive is applied to each joint to ensure the airtightness and structural strength of test model 1.

[0042] Furthermore, test model 1 is a local segment of the actual enclosure system. In order to ensure that the test can accurately reflect the impact of the fluid on the structure and measure the accurate impact pressure, the size of test model 1 must not be less than three corrugation intervals in the length and width directions.

[0043] Furthermore, since the corrugated plate is not conducive to fixing the pressure sensor 2, corresponding mounting holes are opened on the back plate and the corrugated plate at the positions where the detection components are installed. The diameter of the holes should not be greater than 1.5 times the diameter of the pressure sensor 2 to avoid excessive impact on the structural response of the enclosure system.

[0044] Furthermore, the installation steps of the detection components are as follows: First, the pressure sensor 2 is threadedly connected to the internal thread flange 3, and the positioning welding block 5 is welded to the corresponding position on the back plate of the test model 1; second, the axial positioning sleeve 4 is bonded to the internal thread flange 3 and inserted into the through hole of the test model 1; then, the pin plate 6 is used to axially fix the axial positioning sleeve 4, and the lower end cover 10 is used to assist in the axial fixing of the axial positioning sleeve 4 and to achieve the sealing of the corrugated plate surface of the test model 1; finally, the adjusting plate 7 and the upper end cover 8 are installed and fixed with bolts 9 to achieve the sealing of the back plate surface of the test model 1.

[0045] The scheme is further optimized. The protective components include a side guard plate 11 that is attached and fixed to the composite plate. A protective edge is provided between the edge of the side guard plate 11 and the edge of the test model 1. The protective edge includes a corrugated plate protective edge 12, a back plate protective edge 13, a composite layer protective edge 15, and corner guards 16 that surround the edge of the side guard plate 11. The corrugated plate protective edge 12 is located between the side guard plate 11 and the corrugated plate, the back plate protective edge 13 is located between the back plate and the side guard plate 11, and the composite layer protective edge 15 is located between the side guard plate 11 and the side of the composite layer. A sealing strip 14 is provided between several side guard plates 11 fixed to the composite plate on the same side. During the test, water will seep in through the edges of the composite layer of test model 1. This will change the physical properties of test model 1 and may also damage pressure sensor 2. Therefore, protective components are set up to waterproof and protect test model 1. During installation, the side guard plate 11 is first pasted onto the composite plate on the side of test model 1. Then, the corrugated plate edge protector 12, the back plate edge protector 13, the composite layer edge protector 15, and the corner protector 16 are successively bonded to the corresponding corner positions. At the same time, sealing strips 14 are also set between adjacent side guard plates 11. Waterproof glue is applied to the joints for sealing, and filler is applied to the edges of the corrugated plate for sealing. This strengthens the connection strength of the side guard plates 11 and also enhances the waterproof protection of the corners of test model 1.

[0046] Furthermore, in this embodiment, all components of the protective assembly are made of transparent PMMA material with a thickness of 3-5mm. On the one hand, this facilitates the observation and inspection of the deformation and damage of the test model 1 and whether there is water leakage, allowing direct observation and judgment of the internal condition of the test model 1, which is convenient for preparation and maintenance during the test. On the other hand, it will not have an excessive impact on the strength and rigidity of the test model 1, and also prevents water from entering the test model 1 during the test, which would affect the normal operation of the sensor and the quality of the test model 1 itself, thus reducing the impact on the test results.

[0047] Furthermore, in the test condition where the test model 1 is tilted into the water, this method can also effectively prevent additional damage to the side of the test model 1, and can also avoid having an excessive impact on the mass distribution and stiffness of the test model 1.

[0048] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0049] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A slamming pressure measurement system for an LNG carrier containment system, characterized in that: It includes a test model (1), on which several detection components are provided, and a protective component is provided at the top of the test model (1); The detection component includes a protective cylinder disposed between the upper and lower ends of the inner cavity of the test model (1), and a pressure sensor (2) is disposed inside the protective cylinder, with the top end of the pressure sensor (2) extending out of the top end of the protective cylinder; The protective sleeve includes a base at the bottom of the inner cavity of the test model (1) and a top cover at the top of the inner cavity of the test model (1), and an axial positioning sleeve (4) is provided between the base and the top cover. The pressure sensor (2) is located inside the axial positioning sleeve (4) and fixed to the base. The connecting wire of the pressure sensor (2) passes through the top cover and extends out of the axial positioning sleeve (4). The base includes an internally threaded flange (3) disposed at the bottom of the inner cavity of the test model (1), and the bottom end of the axial positioning sleeve (4) is fixed to the internally threaded flange (3); the bottom end of the pressure sensor (2) is threadedly connected to the top end of the internally threaded flange (3). The top cover includes a positioning welding block (5) fixed to the top of the test model (1), an adjustment plate (7) fixed to the top of the positioning welding block (5), an upper end cover (8) fixed to the top of the adjustment plate (7), the top of the axial positioning sleeve (4) passes through the positioning welding block (5) and the adjustment plate (7) in sequence and abuts against the bottom end of the upper end cover (8) and is fixed. The connecting wire of the pressure sensor (2) passes through the upper end cover (8) and is sealed. The top of the positioning welding block (5) is fixed with two assembled pin plates (6), and the two pin plates (6) are arranged around the axial positioning sleeve (4); one end of the pin plate (6) facing the axial positioning sleeve (4) is fixed with a protruding locking pin, and the locking pin is engaged and fixed in the pin hole on the axial positioning sleeve (4).

2. The slamming pressure measurement system for the LNG ship containment system according to claim 1, characterized in that: The test model (1) is provided with a lower end cover (10) at the bottom, and the lower end cover (10) is limitedly connected to the internal threaded flange (3).

3. The slamming pressure measurement system for the LNG ship containment system according to claim 1, characterized in that: The test model (1) includes a rectangular cavity surrounded by composite plates, a back plate is sealed and fixed between the top ends of several composite plates, and a corrugated plate is fixed between the bottom ends of several composite plates; the top cover is fixed to the back plate, and the base is fixed to the corrugated plate.

4. The slamming pressure measurement system for the LNG ship containment system according to claim 3, characterized in that: The protective assembly includes a side guard plate (11) that is attached and fixed to the composite plate, and a protective edge is provided between the edge of the side guard plate (11) and the edge of the test model (1).

5. The slamming pressure measurement system for the LNG ship containment system according to claim 4, characterized in that: The edge protection includes a corrugated plate edge protection (12), a back plate edge protection (13), a composite layer edge protection (15), and corner protectors (16) surrounding the edge of the side guard plate (11); the corrugated plate edge protection (12) is disposed between the side guard plate (11) and the corrugated plate, the back plate edge protection (13) is disposed between the back plate and the side guard plate (11), and the composite layer edge protection (15) is disposed between the side guard plate (11) and the side edge of the composite plate.

6. The slamming pressure measurement system for the LNG ship containment system according to claim 4, characterized in that: A sealing strip (14) is provided between several side guards (11) fixed to the same side of the composite plate.

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