A method of launching a ship

Abstract

This application relates to a method for launching a ship, belonging to the field of shipbuilding and launching technology. The method includes: S1, dividing the inclined ship frame unit into multiple staggered first and second support areas; S2, arranging a connecting beam platform on at least one second support area, and arranging support beams on the remaining first support areas; the connecting beam platform extends outward from the central longitudinal pontoon on both sides, and each end overlaps with one of the two inclined ship frame units; the connecting beam platform, support beams, and support surfaces of the first support areas are coplanar; S3, aligning the longitudinal centerline of the central longitudinal pontoon with the line connecting the center point of the connecting beam platform and the center point of the support beam; S4, launching the aquaculture vessel. The solution provided by this application optimizes the matching between the inclined ship frame unit and the bottom frame structure of the aquaculture vessel, and by increasing the support contact area, reduces local stress concentration, ensuring the integrity of the hull structure during launching.

Description

Technical Field

[0001] This application relates to the field of shipbuilding and launching technology, and in particular to a method for launching a ship. Background Technology

[0002] As a new type of marine equipment, its 155-meter-class hull faces significant technical challenges during its launch. The hull adopts a sea-through frame structure with a lattice layout, which presents a structural mismatch problem with conventional inclined frame equipment. This results in the stress surface of the hull being concentrated in the midship area. This structural misalignment is prone to causing local stress concentration, which threatens both the structural integrity of the hull and the safety of the ship's launch. Summary of the Invention

[0003] To overcome the problems existing in related technologies, this application provides a method for launching ships that can optimize the matching between the inclined ship frame unit and the bottom frame structure of the aquaculture vessel. By increasing the support contact area and reducing local stress concentration, the integrity of the hull structure is ensured during the launching process.

[0004] This application provides a method for launching a vessel, applicable to an aquaculture vessel with a column-stabilized box structure, comprising the following steps: S1. Divide the inclined ship frame unit into multiple staggered first support areas and second support areas. S2. A connecting beam platform is arranged on at least one second support area, and support beams are arranged on the remaining first support areas; the second support area where the connecting beam platform is located includes two inclined ship frame units, the two sides of the connecting beam platform extend outward from the central longitudinal pontoon, and the two inclined ship frame units are respectively connected at both ends; the connecting beam platform, the support beams and the support surface of the first support area are coplanar. S3. Move the aquaculture vessel laterally in two steps to the top of the inclined ship frame unit, so that the longitudinal centerline of the central longitudinal pontoon coincides with the line connecting the center point of the connecting beam platform and the center point of the supporting crossbeam. S4. The aquaculture boat is launched into the water by a winch.

[0005] In some embodiments, in S2, the connecting beam platform includes a platform beam, a first raised beam, and a second raised beam; there are two platform beams, which are arranged in parallel at intervals along the length of the inclined ship frame unit; there are two first raised beams and two second raised beams, wherein the first raised beam is placed on one platform beam, and the second raised beam is placed on the inclined ship frame unit and located between the two platform beams; the first raised beam is used to support the transverse buoy, and the second raised beam is used to support the longitudinal buoy. The difference between the support surface height of the connecting beam platform and the support surface height of the supporting beam is compensated by the tilt angle of the inclined frame unit so that the longitudinal centerline of the longitudinal pontoon coincides with the line connecting the center point of the connecting beam platform and the center point of the supporting beam.

[0006] In some embodiments, in S2, the height of the connecting beam platform is 0.7 meters and the height of the supporting crossbeam is 0.8 meters.

[0007] In some embodiments, step S3, which involves moving the aquaculture vessel laterally above the inclined frame in two stages, specifically includes: S31. Mark the side of the central longitudinal pontoon facing the slipway. Evenly load several hydraulic trolleys on the left longitudinal pontoon, the central longitudinal pontoon, and the right longitudinal pontoon. Use the hydraulic trolleys to move the aquaculture vessel laterally until the mark is far away from the edge of the slipway to a preset distance. S32. Unload the hydraulic trolley located in the extended trestle area. The remaining hydraulic trolley continues to move laterally until the longitudinal centerline of the central longitudinal pontoon coincides with the line connecting the center point of the connecting beam platform and the center point of the supporting crossbeam.

[0008] In some embodiments, step S4, which involves using a winch to launch the aquaculture vessel, specifically includes: S41. The aquaculture boat is pulled by a winch at a first speed of 0.3 m / min for 30 minutes, and then increased to a second speed of 0.6 m / min for uniform operation. During the operation, the current value of the winch is monitored and the force on each inclined boat frame unit is adjusted until the launching operation is completed.

[0009] In some embodiments, S41, monitoring the winch current value and adjusting the force on each inclined frame unit during operation specifically includes: S411. Record the no-load current value of each winch, and add a tension sensor to the drive end of each winch to collect the actual tension of each winch in real time. S412. Monitor the current value of each winch in real time and calculate the current difference, which is the difference between the current value and the no-load current value. S413. By presetting a target tension in the control room, compare the difference between the actual tension and the target tension; S414. Based on the linear relationship K between the current difference and the tension difference, adjust the output current of each winch until the deviation between the actual tension and the target tension of all winches is less than 2%.

[0010] In some embodiments, the method further includes: S5. Set the maximum launching acceleration of the aquaculture vessel to 0.05 m / s², the gust coefficient to 1.5, and the safety factor to 2. The center of gravity height, windward area, and centroid height of the windward area of ​​the aquaculture vessel were collected. The historical maximum wind pressure was collected in the area where the aquaculture vessel was launched. Based on the maximum launching acceleration, center of gravity height, windward area, centroid height of windward area, and historical maximum wind pressure, calculate the capsizing moment of the aquaculture vessel; Calculate the overturning moment of the aquaculture vessel based on the maximum contact width between the supporting beam and the transverse pontoon; Calculate the ratio of the anti-overturning moment to the overturning moment; If the ratio is greater than or equal to the safety factor, the design loads of the longitudinal and transverse pontoons are collected, and the actual loads of the longitudinal and transverse pontoons are verified after the connecting beam platform and supporting crossbeams are arranged. If the actual load is greater than the design load, then the number of connecting beam platforms shall be increased. If the actual load is less than the design load, the aquaculture vessel will be launched. If the ratio is less than the safety factor, then extend the support beam and connecting beam platform so that the support beam and connecting beam platform overlap the left longitudinal pontoon and the right longitudinal pontoon.

[0011] The technical solution provided in this application may include the following beneficial effects: The ship launching method provided in this application divides the inclined ship frame unit into a staggered first support area and a second support area. The first support area is the original conventional inclined ship frame structure layout, while the second support area is equipped with a connecting beam platform and support beams to optimize the matching between the inclined ship frame unit and the bottom frame structure of the aquaculture vessel. This increases the support contact area, reduces local stress concentration, and ensures the integrity of the hull structure during launching. Attached Figure Description

[0012] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0013] Figure 1 This is a schematic diagram of the bottom frame structure of the aquaculture vessel shown in the embodiments of this application; Figure 2 This is a schematic diagram of the inclined ship frame unit shown in the embodiments of this application; Figure 3 This is a schematic diagram showing the arrangement of the first support region and the second support region in an embodiment of this application; Figure 4 This is a schematic diagram showing the state of the inclined ship frame unit after the arrangement of the connecting beam platform and supporting crossbeams in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of the connecting beam platform shown in the embodiments of this application; Figure 6 This is another structural schematic diagram of the connecting beam platform shown in the embodiments of this application; Figure 7 This is a diagram showing the launching state of the aquaculture vessel as illustrated in the embodiments of this application; Figure 8 This is another launching state diagram of the aquaculture vessel shown in the embodiments of this application.

[0014] Figure label: 1. First support area; 2. Second support area; 3. Connecting beam platform; 31. Platform beam; 32. First raised beam; 33. Second raised beam; 4. Support beams; 100. Aquaculture vessel; 101. Longitudinal pontoon; 102. Lateral pontoon; 200. Inclined boat frame unit; 201. Inclined boat frame module. Detailed Implementation

[0015] Preferred embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0016] As an emerging industrial equipment, the aquaculture vessel 100 has various structural types, including column-stabilized / semi-submersible, frame-type, modular, boat-type, barge-type, hull-mounted, self-elevating, and jacket-type. The column-stabilized type of the aquaculture vessel 100 uses a sea-through frame structure at the bottom, with a grid-like layout consisting of a central longitudinal buoy 101, port / starboard longitudinal buoys, and transverse buoys 102. While this structure offers better advantages for aquaculture, it presents structural compatibility issues with traditional inclined frame equipment. The main problem is that the stress-bearing surface of the hull is concentrated within the midship area, easily leading to localized stress concentration, which threatens both the structural integrity of the hull and the safety of launching.

[0017] To address the aforementioned issues, this application provides a method for launching a ship that optimizes the compatibility between the inclined frame assembly 200 and the bottom frame of the aquaculture vessel 100, increases the support contact area, reduces local stress concentration, and ensures structural safety during the launching process.

[0018] Figure 1 This is a schematic diagram of the bottom frame structure of the aquaculture vessel 100 shown in the embodiments of this application. Figure 2 This is a schematic diagram of the structure of the inclined ship frame unit 200 shown in the embodiment of this application.

[0019] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0020] Please see Figure 1 The bottom frame structure of the aquaculture vessel 100 consists of a longitudinally extending and parallel left longitudinal pontoon, a middle longitudinal pontoon 101 and a right longitudinal pontoon, as well as several sets of transverse pontoons 102 connecting the left longitudinal pontoon, the middle longitudinal pontoon 101 and the right longitudinal pontoon.

[0021] Please see Figure 2 The inclined ship frame unit 200 is a special device used in shipbuilding to support the longitudinal and lateral movement of ships to be dismantled or newly built between land-based slipways and waterways. The inclined ship frame unit 200 consists of several parallel inclined ship frame units 201, spaced 7 to 9 meters apart. Each inclined ship frame unit 201 slides along rails to achieve safe displacement of the ship.

[0022] Please see Figures 3 to 8 This application proposes a method for launching a ship, which specifically includes the following steps: S1. Divide the inclined ship frame unit 200 into multiple staggered first support areas 1 and second support areas 2.

[0023] S2. A connecting beam platform 3 is arranged on at least one second support area 2, and support beams 4 are arranged on the remaining first support areas 1. The second support area 2 where the connecting beam platform 3 is located includes two inclined ship frame units 201. The two sides of the connecting beam platform 3 extend outward from the central longitudinal pontoon 101, and the two inclined ship frame units 201 are respectively connected at both ends. The connecting beam platform 3, the support beams 4 and the support surface of the first support area 1 are coplanar.

[0024] S3. Move the aquaculture vessel 100 laterally in two steps above the inclined ship frame unit 200, so that the longitudinal centerline of the central longitudinal pontoon 101 coincides with the line connecting the center point of the connecting beam platform 3 and the center point of the supporting crossbeam 4.

[0025] S4. The aquaculture boat is launched into the water by a winch.

[0026] The aquaculture vessel 100 is mounted on the inclined frame unit 200 along the direction of the inclined frame units 201. Because the length of the inclined frame units 201 is not compatible with the width of the aquaculture vessel 100, the left and right longitudinal pontoons cannot effectively contact the inclined frame units 201. This results in the aquaculture vessel 100 potentially capsizing or deforming when launched, a risk not commonly encountered by conventional vessels. This application divides the inclined frame unit 200 into a first support area and a second support area. The inclined frame units 201 in the first support area 1 support the central longitudinal pontoon 101, while the second support area 2 supports both the central longitudinal pontoon 101 and the transverse pontoons 102. Furthermore, the number of second support areas 2 is related to the number of transverse pontoons 102. Each second support area 2 may include one or two inclined frame units 201, and adjacent second support areas 2 constitute the first support area 1. In specific implementation, the number of second support areas 2 and the corresponding number of inclined frame units 201 are initially determined based on the number of transverse pontoons of the aquaculture vessel 100. After determining the positional layout of the first support area 1 and the second support area 2, the actual contact area between the inclined frame units 201 and the transverse pontoons 102 of the second support area 2 can be determined by fitting and overlapping drawings. Since the inclined frame unit 200 and the bottom structure of the aquaculture vessel 100 are not perfectly matched, in addition to determining that one transverse pontoon 102 can be completely ballasted on the inclined frame unit 201, the remaining transverse pontoons 102 may have the following three situations: the first is that they are completely ballasted on the corresponding inclined frame unit 201; the second is that the transverse pontoons 102 partially ballast on the inclined frame unit 201; and the third is that the transverse pontoons 102 do not contact the inclined frame unit 201 at all. In a preferred embodiment, in order to balance the forces on the bow and stern, the transverse pontoon 102 in the middle of the aquaculture vessel 100 is arranged to ballast the inclined frame unit 201 for connecting beam platform 3 and supporting crossbeam 4, thereby determining the force distribution of the transverse pontoon 102 and the mid-longitudinal pontoon 101.

[0027] Specifically, the design loads of the longitudinal pontoon 101 and the transverse pontoon 102 are first collected, and the actual loads are calculated based on the contact areas between the transverse pontoon 102 and the longitudinal pontoon 102 and the inclined frame unit 201. The actual loads are compared with the design loads. If the actual loads are greater than the design loads, a connecting beam platform 3 is set up in the second support area 2 to distribute the load evenly. That is, when the actual load on the transverse pontoon 102 exceeds the design load, a connecting beam platform 3 is arranged in the second support area 2 where it is located.

[0028] The connecting beam platform 3 can be welded from steel, with its length adjusted according to the spacing of the inclined frame units 201 and its width determined by the actual load on the transverse pontoons 102. The supporting beam 4 can be made of I-beams or box girder structures. When the aquaculture vessel 100 is located on the slipway, it is ballasted by a hydraulic trolley, and the inclined frame unit 200 is moved via a track system. During movement, a laser rangefinder can be used to monitor positional deviations in real time, and a tension sensor can be used to monitor changes in traction force in real time to ensure the force balance of each inclined frame unit 201. The connecting beam platform 3 and supporting beam 4 are arranged in the second support area 2 to optimize the matching between the inclined frame unit 200 and the bottom frame structure of the aquaculture vessel 100. This increases the support contact area and reduces local stress concentration, ensuring the integrity of the hull structure during launching. This method effectively improves the stress distribution of the hull, avoids local stress concentration, and ensures the structural safety during launching. This method is optimized for the special structure of the aquaculture vessel 100 and has better adaptability and reliability.

[0029] Furthermore, the connecting beam platform 3 includes a platform beam 31, a first raised beam 32, and a second raised beam 33; there are two platform beams 31, which are arranged in parallel at intervals along the length of the inclined ship frame unit 200; there are two first raised beams 32 and two raised beams 33, wherein the first raised beam 32 is placed on one platform beam 31, and the second raised beam 33 is placed on the inclined ship frame unit 201 and located between the two platform beams 31. The first raised beam 32 is used to support the transverse pontoon 102, and the second raised beam 33 is used to support the longitudinal pontoon 101. The difference between the support surface height of the connecting beam platform 3 and the support surface height of the supporting beam 4 is compensated by the tilt angle of the inclined frame unit 201 so that the longitudinal centerline of the longitudinal pontoon 101 coincides with the line connecting the center point of the connecting beam platform 3 and the center point of the supporting beam 4.

[0030] Specifically, the platform beam 31 can be an I-beam or box girder structure, with its length matching the spacing of the inclined frame units 201, and both ends fixed to the inclined frame units 201 by high-strength bolts. The first elevation beam 32 and the second elevation beam 33 are rectangular cross-section steel beams. The first elevation beam 32 is used to distribute the concentrated load of the transverse pontoon 102, while the second elevation beam 33 is used for positioning and contact with the longitudinal pontoon 101. The independent movement control of the inclined frame units 201 is realized through a PLC system. Each inclined frame unit 201 is equipped with a displacement sensor and a winch, which automatically adjusts the tilt angle and horizontal position according to the centerline position of the longitudinal pontoon 101. In some implementations, a Hall sensor is embedded at the center point of the connecting beam platform 3 and the center point of the supporting beam 4. A neodymium iron boron magnet is welded every 5m along the longitudinal centerline of the longitudinal pontoon 101. The sensor sampling frequency is 10Hz. The magnetic field induction determines whether the longitudinal centerline of the longitudinal pontoon 101 coincides with the line connecting the center point of the connecting beam platform 3 and the center point of the supporting beam 4. When the magnetic field signal deviation exceeds ±0.1mT, an alarm is triggered. The hull position is readjusted using a hydraulic trolley until the longitudinal centerline of the longitudinal pontoon 101 coincides with the line connecting the center point of the connecting beam platform 3 and the center point of the supporting beam 4.

[0031] In this embodiment, the concentrated load of the bottom frame is distributed to multiple inclined frame units 201. The first raised beam 32 directly bears the vertical force of the transverse pontoon 102, the second raised beam 33 maintains the linear support of the longitudinal pontoon 101, and the platform beam 31, as a force transmission component, transfers the load to the inclined frame foundation. This solves the stress concentration problem caused by the misalignment between the sea-crossing frame structure and the inclined frame, and ensures that the hull is subjected to uniform force during launching.

[0032] Furthermore, the height of the connecting beam platform 3 is 0.7 meters, and the height of the supporting crossbeam 4 is 0.8 meters. The height of the connecting beam platform 3 is achieved through a combination of platform beam 31, first raised beam 32, and second raised beam 33. For example, the bottom structure of the 155-meter aquaculture vessel 100 has two transverse pontoons 102 and a bow pontoon. The bow pontoon can be used as a single transverse pontoon 102, with a spacing of 40 meters between them. When there are three transverse pontoons 102, the connecting beam platform 3 is installed on the inclined frame unit 201J17 and J18. The length and height dimensions of the platform beam 31 are 11m × 3.6m × 0.3m. The first raised beam 32 is laid on the platform beam 31. The first raised beam 32 is a composite I-beam with a length, width, and height dimension of 3.6m × 2m × 0.4m. The second elevation beam 33 has a height of 0.4m, ensuring that the platform beam 31, the first elevation beam 32, and the second elevation beam 33 reach the same plane height. Support beams 4 are installed on the inclined frame J22 and J28, with dimensions of 20m × 2m × 0.8m. The height difference between the connecting beam platform 3 and the support beam 4 is 0.1m, compensated by the tilt angle of the inclined frame unit 201, ensuring that the longitudinal centerline of the mid-longitudinal pontoon 101 coincides with the line connecting the center point of the connecting beam platform 3 and the center point of the support beam 4. This arrangement solves the problem of excessively concentrated contact surfaces between the hull bottom frame structure and the inclined frame unit 201, ensuring the stability of the hull during launching.

[0033] Furthermore, the process of moving the aquaculture vessel 100 horizontally above the inclined ship frame unit 200 in two stages specifically includes: S31. Mark the side of the central longitudinal pontoon 101 facing the slipway. Evenly load several hydraulic trolleys on the left longitudinal pontoon, the central longitudinal pontoon 101 and the right longitudinal pontoon. Use the hydraulic trolleys to move the aquaculture vessel 100 laterally until the mark is far away from the edge of the slipway to a preset distance. S32. Unload the hydraulic trolley located in the extended trestle area. The remaining hydraulic trolley continues to move laterally until the longitudinal centerline of the central longitudinal pontoon 101 coincides with the line connecting the center point of the connecting beam platform 3 and the center point of the supporting crossbeam 4.

[0034] Specifically, the markings can be reflective stickers or laser markings, with the preset distance determined based on the width of the slipway and the length of the extended pier area, for example, 1.5~2m. The hydraulic trolleys employ a synchronous control system, with each set of hydraulic trolleys equipped with pressure sensors to monitor the load-bearing status of each point in real time. The extended pier area refers to the transition support area extending from the inclined frame unit 201 towards the slipway, with a length not less than the width of the transverse pontoon 102. By unloading the hydraulic trolleys in stages and controlling their movement trajectory, localized stress concentration can be avoided when the hull frame contacts the inclined frame unit 200. The initial transverse movement ensures the entire hull is moved into the effective support range of the inclined frame unit 200, while the secondary movement achieves precise positioning by reducing the number of support points. This solution solves the problem of difficult alignment between the sea-crossing frame structure and the inclined frame unit 200, ensuring that the hull load is evenly transferred to the inclined frame unit 201 by adjusting the distribution of support points in stages. Compared to continuous movement, staged operation allows for more precise control of the hull attitude and prevents frame structure deformation caused by asynchronous support at multiple points.

[0035] Furthermore, the specific steps of launching the 200-ton inclined boat engine unit to pull the 100-ton aquaculture boat into the water include: S41. The aquaculture vessel 100 is pulled by a winch to run at a first speed of 0.3 m / min for 30 minutes, and then increased to a second speed of 0.6 m / min for uniform operation. During the operation, the current value of the winch is monitored and the force on each inclined frame unit 201 is adjusted until the launching operation is completed.

[0036] The initial speed is set at 0.3 m / min for stable startup in the initial stage, avoiding structural impact due to sudden loading. If the real-time wind speed exceeds 1.2 times the historical maximum wind pressure during launching, the speed is immediately reduced to 0.1 m / min, and temporary hull fixing devices are activated, such as hydraulic locking blocks at the end of the inclined frame unit 201. Operation is resumed after the wind speed decreases. By adopting a speed control strategy from slow to fast, the ship's status can be observed at a lower speed in the early stages of launching, allowing for timely detection and handling of potential problems. Subsequently, the speed is gradually increased after confirming safety, ensuring both safety and launching efficiency. The current monitoring of the winch uses Hall sensors to collect the current of each phase of the three-phase motor, with a sampling frequency set to 10 Hz. The force adjustment of the inclined frame unit 201 is achieved through a PID controller. Through staged speed control and real-time force balance adjustment, the problem of local overload caused by the concentrated contact surface between the open-sea frame structure hull and the inclined frame unit 200 is solved.

[0037] Compared to existing technologies that use constant-speed launching, dynamic speed regulation distributes the hull load more evenly across each inclined frame unit 201, reducing the maximum contact pressure by 37% according to actual measurements. The current monitoring and force feedback system controls the force deviation of the inclined frame unit 201 to within 2%, effectively preventing structural deformation. This solution is particularly suitable for the aquaculture vessel 100 with a lattice-shaped bottom structure, and its operability has been verified in a 155-meter hull.

[0038] Furthermore, monitoring the winch current value and adjusting the force on each inclined frame unit 201 during operation specifically includes: S411. Record the no-load current value of each winch, and add a tension sensor to the drive end of each winch to collect the actual tension of each winch in real time. S412. Monitor the current value of each winch in real time and calculate the current difference, which is the difference between the current value and the no-load current value. S413. By presetting a target tension in the control room, compare the difference between the actual tension and the target tension; S414. Based on the linear relationship K between the current difference and the tension difference, adjust the output current of each winch until the deviation between the actual tension and the target tension of all winches is less than 2%.

[0039] Specifically, the no-load current value is the current value measured when the winch is not carrying the load of the aquaculture vessel 100, and serves as a benchmark reference. A tension sensor is installed at the drive end of the winch to measure the actual tension of the winch in real time. Simultaneously, since the inclined frame unit 201 of the second support area 2 needs to additionally support the connecting beam platform 3 or the support beam 4, the corresponding tension output is relative to the first support area 1. The specific data can be determined based on the total weight of the connecting beam platform 3 and the support beam 4. The current value is the current value monitored in real time during winch operation. By calculating the difference between this and the no-load current value, the load change of the winch can be reflected. The target tension preset in the control room is an ideal tension value set according to the launching requirements and safety requirements of the aquaculture vessel 100.

[0040] Understandably, the linear relationship K is a proportionality coefficient between the current difference and the tension difference determined by experiment or experience. It is used to guide current adjustment and to ensure that the forces on each inclined frame unit 201 are balanced, avoiding local overload or uneven force.

[0041] In this embodiment, by real-time monitoring and adjustment of the winch's current and tension, the inclined frame unit 201 is ensured to be subjected to uniform and stable force during the launching of the aquaculture vessel 100. The introduction of a tension sensor enables precise measurement of the tension, the calculation of the current difference provides a direct reflection of load changes, and the application of the linear relationship K makes current adjustment more scientific and accurate. Compared with existing technologies, this solution effectively avoids hull structure damage or instability during launching caused by uneven force distribution, improving the safety and reliability of the launching operation. As a preferred implementation, the tension sensor can be a resistance strain gauge or piezoelectric sensor, characterized by high precision and fast response. Furthermore, the control room can be equipped with an automated control system that automatically adjusts the winch's output current based on real-time data, reducing manual intervention and improving operational efficiency.

[0042] Furthermore, the aforementioned methods for launching ships also include: S5. Set the maximum launching acceleration of the aquaculture vessel 100 to 0.05 m / s², the gust coefficient to 1.5, and the safety factor to 2. The center of gravity height, windward area, and centroid height of the windward area of ​​the aquaculture vessel 100 were collected. The historical maximum wind pressure was collected in the area where the aquaculture vessel 100 was launched. Based on the maximum launching acceleration, center of gravity height, windward area, centroid height of windward area, and historical maximum wind pressure, calculate the overturning moment of the aquaculture vessel 100. Calculate the overturning moment of the aquaculture vessel 100 based on the maximum contact width between the supporting beam 4 and the transverse pontoon 102; Calculate the ratio of the anti-overturning moment to the overturning moment; If the ratio is greater than or equal to the safety factor, the design loads of the longitudinal pontoon 101 and the transverse pontoon 102 are collected, and the actual loads of the longitudinal pontoon 101 and the transverse pontoon 102 are verified after the connection beam platform 3 and the supporting crossbeam 4 are arranged. If the actual load is greater than the design load, the number of connecting beam platforms 3 shall be increased. If the actual load is less than the design load, the aquaculture vessel will be launched at 100 meters. If the ratio is less than the safety factor, then extend the support beam 4 and the connecting beam platform 3 so that the support beam 4 and the connecting beam platform 3 overlap the left longitudinal pontoon and the right longitudinal pontoon.

[0043] The maximum launching acceleration is used to limit the rate of change of the hull's velocity to avoid instability caused by inertial forces. The gust coefficient is used to amplify static wind pressure to simulate instantaneous wind load impact, while the safety factor serves as a redundancy design benchmark for anti-overturning capability. In the overturning moment calculation, the difference between the height of the centroid of the wind-receiving area and the height of the center of gravity directly affects the moment arm length; the historical maximum wind pressure is obtained through meteorological data. The calculation of the anti-overturning moment depends on the contact width between the supporting beam 4 and the transverse pontoon 102, which is determined through structural drawings or on-site measurements. Actual load verification is performed using strain gauges or pressure sensors for real-time monitoring. The increase in the number of connecting beam platforms 3 is achieved by adding raised beams, while the extension of the supporting beam 4 and connecting beam platform 3 is accomplished by segmented splicing or replacing the entire structure with longer components.

[0044] Specifically, the maximum launching acceleration is used to limit the inertial force of the hull motion to avoid structural overload, and the gust coefficient is used to amplify static wind loads to simulate extreme conditions. A safety factor of 2 is set based on the conventional safety margin requirements for marine engineering structures. In the overturning moment calculation, the difference between the height of the centroid of the wind-exposed area and the height of the center of gravity directly affects the moment arm length; the historical maximum wind pressure uses local 50-year return period extreme data. The calculation of the anti-overturning moment depends on the contact width between the supporting beam 4 and the transverse pontoon 102, which is determined through finite element analysis or physical measurement. When verifying actual loads, if it is necessary to add a connecting beam platform 3, it should be added symmetrically in the bow and stern areas to maintain hull balance. When extending the supporting beam 4 and the connecting beam platform 3, the extension length must cover more than 60% of the width of the port / starboard longitudinal pontoons to ensure effective force transmission.

[0045] To address complex operating conditions, the method also includes the following details: The launch time is chosen during the slack tide period, when the current velocity is ≤0.5m / s. To avoid the hull shifting due to the impact of the water flow, the winch tension is adjusted to compensate for the change. For example, the tension is increased by 5% for every 0.1m / s increase in the current velocity.

[0046] When launching the ship in winter, apply low-temperature grease to the track of the 200-meter inclined ship frame unit to reduce the coefficient of friction to 0.15.

[0047] During the summer when the water is hot, spray water on the track for 30 seconds every 10 minutes to prevent thermal expansion and deformation.

[0048] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A method for launching a vessel, the method being applied to an aquaculture vessel (100) with a column-stabilized box structure, comprising the following steps: S1. Divide the inclined ship frame unit (200) into multiple staggered first support areas (1) and second support areas (2); S2. A connecting beam platform (3) is arranged on at least one of the second support areas (2), and support beams (4) are arranged on the remaining first support areas (1); the second support area (2) where the connecting beam platform (3) is located includes two inclined ship frame units (201), the two sides of the connecting beam platform (3) extend outward from the central longitudinal pontoon (101), and the two ends are respectively connected to the two inclined ship frame units (201), the connecting beam platform (3), the support beams (4) are coplanar with the support surfaces of the first support areas (1); The connecting beam platform (3) includes a platform beam (31), a first raised beam (32), and a second raised beam (33); there are two platform beams (31), which are arranged in parallel at intervals along the length of the inclined ship frame unit (200); there are two first raised beams (32) and two raised beams (33), wherein the first raised beam (32) is placed on one platform beam (31), and the second raised beam (33) is placed on the inclined ship frame unit (201) and located between the two platform beams (31). The first raised beam (32) is used to support the transverse pontoon (102), and the second raised beam (33) is used to support the longitudinal pontoon (101); S3. Move the aquaculture vessel (100) laterally to the top of the inclined frame unit (200) in two steps. The difference between the support surface height of the connecting beam platform (3) and the support surface height of the supporting beam (4) is compensated by the tilt angle of the inclined frame unit (201) so that the longitudinal center line of the longitudinal pontoon (101) coincides with the line connecting the center point of the connecting beam platform (3) and the center point of the supporting beam (4). S4. The aquaculture boat (100) is launched into the water by a winch.

2. The ship launching method according to claim 1, characterized in that, In S2, the height of the connecting beam platform (3) is 0.7 meters, and the height of the supporting beam (4) is 0.8 meters.

3. The ship launching method according to claim 1, characterized in that, In step S3, the process of moving the aquaculture vessel (100) laterally to the top of the inclined ship frame unit (200) in two stages specifically includes: S31. Mark the side of the central longitudinal pontoon (101) facing the slipway. Evenly load several hydraulic trolleys on the left longitudinal pontoon, the central longitudinal pontoon (101) and the right longitudinal pontoon. Use the hydraulic trolleys to move the aquaculture vessel (100) laterally until the mark is far away from the edge of the slipway to a preset distance. S32. Unload the hydraulic trolley located in the extended trestle area. The remaining hydraulic trolley continues to move laterally until the longitudinal centerline of the central longitudinal pontoon (101) coincides with the line connecting the center point of the connecting beam platform (3) and the center point of the supporting crossbeam (4).

4. The ship launching method according to claim 1, characterized in that, In step S4, launching the aquaculture vessel (100) into the water via a winch specifically includes: S41. The aquaculture boat (100) is pulled by a winch to run at a first speed of 0.3 m / min for 30 minutes, and then increased to a second speed of 0.6 m / min to run at a constant speed. During the operation, the current value of the winch is monitored and the force on each inclined boat frame unit (201) is adjusted until the launching operation is completed.

5. The ship launching method according to claim 4, characterized in that, In S41, monitoring the winch current value and adjusting the force on each inclined frame unit (201) during operation specifically includes: S411. Record the no-load current value of each winch, and add a tension sensor to the drive end of each winch to collect the actual tension of each winch in real time. S412. Monitor the current value of each winch in real time and calculate the current difference, which is the difference between the current value and the no-load current value. S413. By presetting a target tension in the control room, compare the difference between the actual tension and the target tension; S414. Based on the linear relationship K between the current difference and the tension difference, adjust the output current of each winch until the deviation between the actual tension and the target tension of all winches is less than 2%.

6. The ship launching method according to claim 1, characterized in that, The method further includes: S5. Set the maximum launching acceleration of the aquaculture vessel (100) to 0.05 m / s², the gust coefficient to 1.5, and the safety factor to 2. The center of gravity height, windward area, and centroid height of the windward area of ​​the aquaculture vessel (100) were collected. The historical maximum wind pressure was collected in the area where the aquaculture vessel (100) was launched. Based on the maximum launching acceleration, center of gravity height, windward area, centroid height of windward area, and historical maximum wind pressure, calculate the overturning moment of the aquaculture vessel (100); The overturning moment of the aquaculture vessel (100) is calculated based on the maximum contact width between the supporting beam (4) and the transverse pontoon (102). Calculate the ratio of the anti-overturning moment to the overturning moment; If the ratio is greater than or equal to the safety factor, the design loads of the longitudinal pontoon (101) and the transverse pontoon (102) are collected, and the actual loads of the longitudinal pontoon (101) and the transverse pontoon (102) are verified after the connection beam platform (3) and the supporting crossbeam (4) are arranged. If the actual load is greater than the design load, the number of connecting beam platforms (3) shall be increased. If the actual load is less than the design load, the aquaculture vessel (100) will be launched. If the ratio is less than the safety factor, then the support beam (4) and the connecting beam platform (3) are extended so that the support beam (4) and the connecting beam platform (3) overlap the left longitudinal pontoon and the right longitudinal pontoon.

Images