A test method for simulating wind field overlap of wave compensation trestle on maintenance vessels

Abstract

This invention relates to a method for simulating wind field connection tests of wave compensation trestle on maintenance vessels. The connection test method includes the following steps: using a boarding ladder instead of a wind field platform for wave compensation trestle connection; conducting safety checks and pre-testing before the test; moving the maintenance vessel to the test area and positioning it 10-25 meters from the simulated wind pile; raising and rotating the trestle, swinging it to a 90° angle with the vessel hull, ready for connection; extending the trestle until its end contacts the boarding ladder, automatically switching to the connection state upon complete connection; checking the connection; moving the mother ship towards the bow, stern, port hull, and starboard hull, maintaining the connection between the trestle and the boarding ladder. The advantages of this invention are: by conducting the trestle connection test at the company's dock, using the boarding ladder fixture instead of a wind field platform, the test time and cost of the maintenance vessel trestle connection are shortened, and the connection test cost is reduced; furthermore, by optimizing the trestle connection test process, subsequent projects can be delivered smoothly.

Description

Technical Field

[0001] This invention relates to the field of wave compensation trestle connection test, specifically to a method for simulating wind field connection test of wave compensation trestle on maintenance vessels. Background Technology

[0002] Wave-compensated trestle bridges are crucial equipment in offshore wind power operation and maintenance (O&M). Typically installed on dedicated O&M vessels, their technical level and configuration are significant for improving the safety, efficiency, and comfort of offshore wind power O&M. The hovering and docking working modes of wave-compensated trestle bridges can adapt to the needs of offshore wind power O&M in different sea states, ensuring the safe boarding and disembarking of personnel. Furthermore, the configuration of wave-compensated trestle bridges also provides O&M vessels with higher comfort and environmental performance, offering better protection for offshore wind power O&M.

[0003] In existing technologies, wave compensation trestle connection tests for maintenance vessels need to be conducted in wind farms, using two tugboats to stabilize the vessel for 72 hours over three consecutive days. If problems arise during the test, the time spent in the wind farm will be extended. This lengthy wind farm testing time leads to high costs for maintenance vessel trestle connection tests, and the existing trestle connection test process needs optimization. Therefore, a method for simulating wind farm connection tests for wave compensation trestle on maintenance vessels is needed. This method should utilize a trestle connection test at the company's dock, optimizing the test process to reduce costs and ensure smooth delivery of subsequent projects. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for simulating wind field connection test of wave compensation trestle on maintenance vessel, which can solve the problems in the prior art where the wind field test time of maintenance vessel is too long, resulting in high cost of trestle connection test and the need to optimize the trestle connection test process.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a method for simulating wind field overlap test of wave compensation trestle on maintenance vessels, comprising the following steps:

[0006] S1. Use a boarding ladder instead of a wind farm platform for wave compensation trestle construction. The boarding ladder should be at least 14 meters high. Place the boarding ladder in the middle of the dock passage and take anti-tipping measures. When fixing the boarding ladder, lay steel plates at the bottom of the boarding ladder and weld them to the ladder with a support plate. At the same time, place two 10T counterweights on the steel plates on both sides of the boarding ladder and weld them to the boarding ladder with the support plate.

[0007] The original angle steel and railings at the top of the boarding ladder were removed, and a 5m×4m steel platform was laid at the top of the boarding ladder for docking of the pier. Railing sleeves were welded onto the steel platform and railings were installed.

[0008] S2. Before the overlap test, conduct a safety inspection to ensure that all the air valves of the anti-roll tank are open. After adjusting the anti-roll system on the control panel to AUTO mode in the engine room control room, check whether the system is operating normally. Perform a pre-inspection of the trestle system, including trestle communication inspection and trestle MRU positioning unit inspection, as well as DP system pre-inspection.

[0009] S3. Before the overlap test, pre-test the wave compensation trestle system to confirm that the wave compensation function and related alarm points are working properly.

[0010] S4. Unmoor the mooring lines of the maintenance vessel and use a tugboat to pull the maintenance vessel to the test area waters. The maintenance vessel uses the DP system to position the vessel at a position of 10-25 meters from the simulated wind pile. The pier operator observes in the wheelhouse whether the pier is in a suitable overlapping position and communicates with the DP control console personnel located at the rear of the wheelhouse in a timely manner to ensure that the vessel is in a suitable overlapping position.

[0011] S5. After the ship's position is adjusted, start raising the pier from the driver's seat in the wheelhouse. After the pier leaves the support frame, slowly rotate the pier. Swing the pier to a 90° angle with the ship. Adjust the height of the pier according to the tide level. The top of the pier is located in front of and in the center of the boarding ladder connection point, ready for connection.

[0012] S6. Extend the trestle. During this period, the operator observes the screen displayed on the monitor at the end of the trestle and interacts closely with the monitoring personnel of the transfer platform until the end of the trestle makes safe contact with the boarding ladder. After contact, check whether the pressure value of the top-mounted sensor reaches the safe top-mounted force. The safe working top-mounted force is 0.6~0.8T. The overlap is completed. When fully overlapped, it automatically switches to the overlapped state.

[0013] S7. Within ten minutes, check the overall structure of the trestle connection. If the trestle remains connected and no alarm occurs, check whether the wave compensation mode function is working properly.

[0014] S8. Using the DP system, move the mother ship 2m in each of the four directions: bow, stern, port hull, and starboard hull, while keeping the pier connected to the boarding ladder.

[0015] S9. After the connection is completed, slowly move the vessel away from the boarding ladder and execute the automatic disconnection of the connection.

[0016] S10. Reassemble the trestle and perform an emergency disconnection test, and repeat the test on the control position;

[0017] S11. Reverse operation: safely retract the pier to the rack. After the pier is retracted, activate DP control mode to adjust the bow and depart from the dock.

[0018] Furthermore, in step S1, the two sides of the boarding ladder are fixed to the dock bollards by windproof cables and steel wire ropes.

[0019] Furthermore, in step S2, the trestle communication check includes confirming device port connection, checking power supply, checking signal transmission, checking network connection, checking device configuration, checking device status, and communication testing; the trestle MRU positioning unit check includes checking device status, functional testing, and data analysis; and the DP system pre-check includes checking sensors, checking control modes, and functional testing of the ship's DP system.

[0020] Furthermore, during the bridge communication check, the following steps are performed: Equipment connection is confirmed: The connection cable between the bridge driver's seat and the CCTV equipment at the bridge is checked for a secure connection, ensuring the connection port is not loose or damaged; Power supply is checked: Both the bridge driver's seat and the CCTV equipment at the bridge are connected to a normal power supply, and the power switch is confirmed to be in the "on" position; Signal transmission is checked: Using testing instruments, the signal transmission between the bridge driver's seat and the CCTV equipment at the bridge is checked for normal operation, using an oscilloscope or multimeter to test the signal strength and stability; Network connection is checked: The connection between the bridge driver's seat and the CCTV equipment at the bridge is checked... Network connectivity between devices is normal; Check device configuration: Review the configuration files of the driver's seat on the trestle and the CCTV device on the trestle to confirm that the communication parameters IP address, subnet mask, and gateway settings between the devices are correct; Check device status: Observe the working status indicator lights of the driver's seat on the trestle and the CCTV device on the trestle to confirm whether the devices are operating normally. If there are any abnormalities, record them promptly and report them to the relevant technical personnel; Communication test: Conduct a communication test between the driver's seat on the trestle and the CCTV device on the trestle to confirm that both parties can send and receive signals normally. Test the smoothness of communication by sending test signals or performing actual operations.

[0021] Furthermore, during the inspection of the MRU positioning unit on the trestle, the following steps are taken: Checking the device status: checking the working status indicator lights of the MRU device to confirm whether the device is operating normally; Functional testing: checking the sensitivity, detection speed, and data acquisition of the sensors; Data analysis: analyzing the data collected by the MRU device to confirm the accuracy and completeness of the data.

[0022] The DP system pre-check includes: checking sensors: inspecting the ship's DP system sensors, including GPS, gyroscopes, and accelerometers, to ensure the sensors are working properly; checking control modes: inspecting the ship's DP system control mode settings, including manual and automatic modes, to ensure the system can switch as needed and can work normally after switching; and functional testing of the ship's DP system, including position holding, position correction, and ship movement, observing the system's response speed, accuracy, and whether it can stably control the ship's position during the test.

[0023] Furthermore, in step S5, to safely avoid collisions, the lifting speed of the trestle is controlled to not exceed 0.3 m / s, and the rotation speed of the trestle is controlled to be 0.2 r / min.

[0024] Furthermore, in step S6, the extension speed of the trestle is controlled to be 1.5 min / m.

[0025] The advantages of this invention are: by conducting trestle connection tests at the company's dock and using boarding ladder equipment to replace the wind farm platform, the time and cost required for trestle connection tests on maintenance vessels are shortened, greatly reducing the cost of trestle connection tests on maintenance vessels. Furthermore, by optimizing the trestle connection test process, the smooth delivery of subsequent projects is ensured. Attached Figure Description

[0026] Figure 1 This is a side view of the boarding ladder arrangement of the present invention;

[0027] Figure 2 This is a top view of the boarding ladder arrangement of the present invention;

[0028] Figure 3 for Figure 1 Enlarged structural diagram of region I in the middle;

[0029] Figure 4 This is a diagram showing the state of the maintenance vessel's mooring cable docked at the pier according to the present invention.

[0030] Figure 5 This is a diagram showing the pier of the maintenance vessel of the present invention at a 90° angle to the hull.

[0031] Figures 6-9 This is a diagram showing the test positions of the pier after the maintenance vessel of the present invention has moved in four directions: bow, stern, port hull, and starboard hull. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments will enable those skilled in the art to more fully understand this invention, but do not limit the invention to the scope of the described embodiments.

[0033] This specific implementation adopts the following technical solution: a method for simulating wind field overlap test of wave compensation trestle on maintenance vessels, including the following steps:

[0034] S1. Use the company’s existing resources for supporting reforms, and use the boarding ladder 10 to replace the wind farm platform for wave compensation trestle connection. The boarding ladder 10 is at least 14 meters high.

[0035] like Figure 1-3As shown, the boarding ladder 10 is placed in the middle of the dock passage and anti-tipping measures are taken. When fixing the boarding ladder 10, a steel plate 11 is laid at the bottom of the boarding ladder 10 and welded to it with a support plate 12. At the same time, two 1 meter wide and 10-ton counterweight blocks 13 are placed on the steel plates 11 on both sides of the boarding ladder 10 and welded to the boarding ladder 10 with the support plate 12 to prevent the boarding ladder 10 from tipping over. At the same time, the boarding ladder 10 is fixed to the dock bollards on both sides by windproof cable ropes 14 and steel wire rope cables 15.

[0036] The original angle steel and railings at the top of the boarding ladder 10 were removed, and a 5m×4m steel platform was laid at the top of the boarding ladder 10 for docking of the pier. Railing sleeves were welded onto the steel platform and railings were installed.

[0037] S2. A safety inspection shall be conducted before the splicing test. During the safety inspection, the mooring lines of the maintenance vessel shall be held at the dock. Figure 4 As shown.

[0038] After confirming that all the vent valves of the anti-roll tank are open, adjust the anti-roll system on the control panel to AUTO mode in the engine room control room and check whether the system is operating normally. Perform a pre-check on the trestle system, including trestle communication check, trestle MRU positioning unit check, and DP system pre-check.

[0039] The pier communication check includes confirming equipment port connections, checking power supply, checking signal transmission, checking network connections, checking equipment configuration, checking equipment status, and communication testing; the pier MRU positioning unit check includes checking equipment status, functional testing, and data analysis; and the DP system pre-check includes checking sensors, checking control modes, and functional testing of the ship's DP system.

[0040] During the communication check of the trestle bridge, the following steps were performed: Confirm equipment connection: Check that the connection cable between the driver's seat and the CCTV equipment on the trestle bridge is secure, ensuring the connection port is not loose or damaged; Check power supply: Ensure that both the driver's seat and the CCTV equipment on the trestle bridge are connected to a normal power supply and confirm that the power switch is on; Check signal transmission: Use testing instruments to check whether the signal transmission between the driver's seat and the CCTV equipment on the trestle bridge is normal, using an oscilloscope or multimeter to test the signal strength and stability; Check network connection: Ensure that both the driver's seat and the CCTV equipment on the trestle bridge... The network connection between the two devices is normal. Check the equipment configuration: review the configuration files of the driver's seat on the trestle and the CCTV equipment at the trestle to confirm that the communication parameters (IP address, subnet mask, gateway) are set correctly. Check the equipment status: observe the status indicator lights of the driver's seat on the trestle and the CCTV equipment at the trestle to confirm whether the equipment is operating normally. If any abnormalities are found, record them immediately and report them to the relevant technical personnel. Communication test: conduct a communication test between the driver's seat on the trestle and the CCTV equipment at the trestle to confirm that both sides can send and receive signals normally. Test the smoothness of communication by sending test signals or performing actual operations.

[0041] During the inspection of the MRU positioning unit on the trestle, the following steps are performed: Check the equipment status: Check the working status indicator lights of the MRU equipment to confirm whether the equipment is operating normally; Functional testing: Check the sensitivity, detection speed, and data acquisition of the sensors; Data analysis: Analyze the data collected by the MRU equipment to confirm the accuracy and completeness of the data.

[0042] During the pre-inspection of the DP system, the following steps are taken: Sensor checks: Inspect the sensors of the ship's DP system, including GPS, gyroscopes, and accelerometers, to ensure they are functioning correctly; Control mode checks: Check the control mode settings of the ship's DP system, including manual and automatic modes, to ensure the system can switch as needed and function normally after switching; Functional testing of the ship's DP system, including position holding, position correction, and ship movement, observing the system's response speed, accuracy, and ability to stably control the ship's position during the testing.

[0043] S3. Before the overlap test, pre-test the wave compensation trestle system to confirm that the wave compensation function and related alarm points are working properly.

[0044] S4. Unmoor the mooring lines of the maintenance vessel and use a tugboat to pull the maintenance vessel to the test area waters. The maintenance vessel uses the DP system to position the vessel at a position of 10-25 meters from the simulated wind pile. The pier operator observes from the wheelhouse whether the pier is in a suitable overlapping position and communicates with the DP control console personnel located at the rear of the wheelhouse in a timely manner to ensure that the vessel is in a suitable overlapping position.

[0045] S5. After the vessel's position is adjusted, begin raising the pier from the wheelhouse seat. To ensure safety and avoid collisions, control the pier's lifting speed to no more than 0.3 m / s. Once the pier is off the support frame, slowly rotate it, maintaining a rotation speed of 0.2 r / min. Figure 5 As shown, the pier should be swung to a 90° angle with the ship. It is recommended to test this at low tide. If there are high or low tides, adjust the height of the pier according to the tide level. The top of the pier should be located in front of and in the center of the boarding ladder 10 connection point, ready for connection.

[0046] S6. Extend the trestle at a speed of 1.5 min / m. During this time, the operator observes the monitor at the end of the trestle and interacts closely with the monitoring personnel on the transfer platform until the end of the trestle makes safe contact with the boarding ladder. After contact, check whether the pressure value of the top contact sensor reaches the safe top contact force. The safe working top contact force is 0.6~0.8T. The overlap is completed. When fully overlapped, the system automatically switches to the overlap state.

[0047] S7. Within ten minutes, check the overall structure of the trestle connection. If the trestle remains connected and no alarm occurs, check if the wave compensation mode function is working properly.

[0048] S8. Using the DP system, move the mother ship 2 meters in each of the four directions: bow, stern, port hull, and starboard hull, while maintaining the connection between the pier and the boarding stairs. Figure 6-9 The figures shown are the test positions of the pier after the maintenance vessel moved in four directions: bow, stern, port hull, and starboard hull.

[0049] S9. After the connection is completed, slowly move the vessel away from the boarding ladder and execute the automatic disconnection of the connection.

[0050] S10. Reassemble the trestle and perform an emergency disconnection test, and repeat the test on the control position.

[0051] S11. Reverse operation: safely retract the pier to the rack. After the pier is retracted, activate DP control mode to adjust the bow and depart from the dock.

[0052] By conducting trestle connection tests at the company's wharf, utilizing boarding ladders instead of wind farm platforms, and optimizing the trestle connection test process, the specific economic benefits are as follows: Two days of the original three-day wind farm test can be conducted at the company's wharf, saving RMB 1.067 million in wind farm rental and escort costs; conducting trestle tests at the company's wharf saves approximately RMB 392,200 in tugboat rental costs; and two days of the original three-day wind farm test can be conducted at the company's wharf, saving RMB 15,000 in labor costs; the total cost savings are approximately RMB 1.448 million, significantly reducing the risks and costs of wind farm tests on maintenance vessels and providing valuable experience for similar projects in the future.

[0053] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for simulating a wind field overlap test for a wave-compensated gangway of an operations vessel, characterized in that: The method comprises the following steps: S1, a boarding ladder is selected to replace the wind field platform to connect the wave compensation gangway, the boarding ladder is at least 14 meters high, the boarding ladder is placed in the middle of the wharf channel, and anti-tilting measures are taken; when the boarding ladder is fixed, a steel plate is laid at the bottom of the boarding ladder and welded and fixed with a horse plate, and two 10T counterweights are placed on the steel plates on both sides of the boarding ladder and welded with the boarding ladder through the horse plate; The original angle steel and rail at the top of the boarding ladder are cut off, a 5m*4m steel platform is laid at the top end of the boarding ladder for the gangway to stop, and rail sleeves are welded on the steel platform to install the rail; S2, safety inspection is performed before the connection test, it is determined that the air vents of the anti-rolling tank are all opened, the anti-rolling system on the control panel in the engine room is adjusted to AUTO mode, and it is checked whether the system is normally operated, and the gangway system is pre-inspected, including gangway communication inspection and gangway MRU positioning unit inspection, and DP system pre-inspection; S3, the wave compensation gangway system is pre-commissioned before the connection test, and it is confirmed whether the wave compensation function and the related alarm points are normally operated; S4, the mooring ropes of the operation and maintenance ship are untied, the operation and maintenance ship is pulled to the test area water area by a tug, the operation and maintenance ship is positioned at a position 10-25 meters away from the simulated wind pile by using the DP system, the gangway operator observes whether the gangway is in the appropriate connection position in the driver's room, communicates with the DP console personnel located at the tail of the driver's room in time, and ensures that the ship position is in the appropriate connection position; S5, after the ship position adjustment is completed, the gangway is lifted on the driver control chair in the driver's room, the gangway is slowly rotated after the gangway leaves the rack, the gangway is swung to a direction of 90° with the ship body, the height of the gangway is adjusted according to the tidal level, the top end of the gangway is located in front of and at the center of the boarding ladder connection point, and the connection is prepared; S6, the gangway is extended, during which the operator observes the picture displayed on the gangway end part monitor display, and closely interacts with the transfer platform monitoring personnel until the gangway end part is in safe contact with the boarding ladder, after the contact, it is checked whether the pressure value of the top contact sensor reaches the safe top contact force, the safe working top contact force is 0.6-0.8T, the connection is completed, and the connection state is automatically switched when the connection is completely connected; S7, the overall structure of the gangway connection is checked within ten minutes, the gangway remains connected, no alarm occurs, and it is checked whether the wave compensation mode function is normally operated; S8, the mother ship is moved 2m in the bow, stern, left chord and right chord directions respectively through the DP system, and the gangway remains connected with the boarding ladder; S9, after the connection is completed, the ship is slowly moved away from the boarding ladder, and the automatic disconnection connection is performed; S10, the gangway is connected again and the emergency disconnection test is performed, and the control position is repeatedly tested; S11, reverse operation is performed, the gangway is safely recovered to the rack, after the gangway recovery is completed, the DP control mode is started to complete the ship bow adjustment, and the ship is driven away from the wharf.

2. The method according to claim 1, wherein the method is characterized in that: In the step S1, the boarding ladder is fixed through the wind cable, steel wire rope and the cable pile of the wharf.

3. The method of claim 1, wherein the method further comprises: The step S2, the stack bridge communication inspection includes confirming device port connection, checking power supply, checking signal transmission, checking network connection, checking device configuration, checking device state, communication test; the stack bridge MRU positioning unit inspection includes checking device state, function test, data analysis; and the DP system pre-inspection includes checking sensor, checking control mode, ship DP system function test.

4. The method according to claim 3, wherein the method is characterized in that: In the stack bridge communication inspection, the device connection is confirmed: whether the connection line between the stack bridge driver's seat and the stack bridge CCTV device is firmly connected, ensuring that the connection port is not loose or damaged; the power supply is checked: ensuring that the stack bridge driver's seat and the stack bridge CCTV device are connected to normal power supply, and confirming that the power switch is in the open state; the signal transmission is checked: using test instruments, checking whether the signal transmission between the stack bridge driver's seat and the stack bridge CCTV device is normal, using an oscilloscope or a multipurpose ammeter to detect the strength and stability of the signal; the network connection is checked: ensuring that the network connection between the stack bridge driver's seat and the stack bridge CCTV device is normal; the device configuration is checked: checking the configuration file of the stack bridge driver's seat and the stack bridge CCTV device, confirming that the communication parameters IP address, subnet mask, gateway between the devices are set correctly; the device state is checked: observing the working state indicator light of the stack bridge driver's seat and the stack bridge CCTV device, confirming whether the device is running normally, if there is any abnormality, timely record and report relevant technical personnel; the communication test is performed: communication test between the stack bridge driver's seat and the stack bridge CCTV device, confirming that both parties can normally receive and send signals, testing whether the communication is smooth by sending test signals or actual operation.

5. The method according to claim 3, wherein the method is characterized in that: In the stack bridge MRU positioning unit inspection, the device state is checked: checking the working state indicator light of the MRU device, confirming whether the device is running normally; the function test is performed: checking the sensitivity, detection speed, data acquisition of the sensor; the data analysis is performed: analyzing the data collected by the MRU device, confirming the accuracy and integrity of the data; In the DP system pre-inspection, the sensor is checked: checking the sensor of the ship DP system, including GPS, gyroscope, accelerometer, ensuring that the sensor works normally; the control mode is checked: checking the control mode setting of the ship DP system, including manual and automatic mode, ensuring that the system can be switched as needed and can work normally after switching; the ship DP system function test, including position keeping, position correction, ship movement, observing the response speed, accuracy and whether the system can stably control the position of the ship during the test process.

6. The method of claim 1, wherein the method further comprises: In the step S5, in order to avoid collision safely, the stack bridge lifting speed is controlled not to exceed 0.3 m / s, and the stack bridge rotating speed is controlled at 0.2 r / min.

7. The method of claim 1, wherein the method further comprises: In the step S6, the stack bridge extension speed is controlled at 1.5 min / m.

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