Ship sheet deformation hot work correction method based on digital twinning

Abstract

The invention discloses a ship thin plate deformation hot work correction method based on digital twinning, which comprises the following steps: S1, acquiring data of ship thin plate segments through a data acquisition system, mapping a field physical model into a virtual world, and constructing a digital twinning model of the ship thin plate segments; s2, extracting a deformed cloud picture of each segment, and analyzing whether each thin plate segment needs to be corrected or not through the deformed cloud picture; s3, if so, packaging a thin plate hot work correction temperature determination method based on the combination of laser measurement and finite element simulation into a module, embedding the module into the digital twin model, and calling the module to determine the hot work correction temperature; s4, the actual surface temperature of the thin plate is calculated through a matching relation model between the flame and the front water cooling flow; and S5, the front water cooling flow is adjusted in real time according to the firer correction temperature obtained through simulation, and firer correction is simulated in the digital twinborn model based on the data. The purposes of scientifically correcting the deformation of the thin plate and improving the production efficiency are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and specifically provides a thermal straightening method for ship thin plate deformation based on digital twin. Background Technique

[0002] In the shipbuilding industry, ship types such as PCTC (pure car and truck carrier) and luxury cruise ships mostly use thin plates with a thickness of less than 10 mm. At present, CO2 shielded metal arc welding + submerged arc welding process is mostly used for welding thin plates, with a relatively large heat input. In addition, the thin plates have relatively poor anti-deformation ability, and uneven thermal stress during welding is likely to cause large deformation. In addition, during the subsequent overall assembly and hoisting process, operations such as hoisting and welding of sections will also cause secondary deformation of the thin plates. Therefore, shipyards often need to use thermal straightening and other methods to correct the deformation of thin plates. However, the current thermal straightening is highly dependent on manual labor, and the experience of workers largely determines the quality of deformation correction, and the situation of rework often exists on site.

[0003] The invention patent with the publication number of CN 112170546A discloses a thermal straightening method for a duplex stainless steel T-joint. This method uses a semi-automatic thermal straightening device to perform thermal straightening on a straight path, and maintains the thermal straightening temperature by means of temperature measurement and front-side cold water cooling. This invention can correct the flatness deformation of the back side of the duplex stainless steel T-joint within a certain range, but this method is mainly applicable to the duplex stainless steel T-joint and has certain limitations.

[0004] The invention patent with the publication number of CN103042075A discloses a thermal straightening method for the out-of-tolerance diameter of a cylindrical structure. This method uses a thermal process to cause deformation in the heated area, corrects the roundness of the cylindrical structure, and controls its correction amount to reduce the number of heating times, thereby achieving the purpose of shortening the cycle of the entire straightening work. However, this method is still mainly aimed at cylindrical structures and has certain reference significance in the shipbuilding industry. In actual engineering applications, there is still a lack of a general thermal straightening method for ship thin plate deformation.

[0005] In view of the above problems, a thermal straightening method for ship thin plate deformation based on digital twin is provided. Summary of the Invention

[0006] The purpose of the present invention is to provide a thermal straightening method for ship thin plate deformation based on digital twin to overcome the existing defects, achieving the purpose of scientifically correcting the deformation of thin plates and improving production efficiency.

[0007] The technical solution to achieve the above purpose is as follows:

[0008] A thermal straightening method for ship thin plate deformation based on digital twin, including:

[0009] Step S1: Obtain the data of the hull thin-plate segment through the data acquisition system, map the physical model on-site into the virtual world, and construct a digital twin model of the hull thin-plate segment;

[0010] Step S2: Extract the deformation nephogram of each segment, and analyze whether each thin-plate segment needs to be corrected through the deformation nephogram;

[0011] Step S3: If necessary, encapsulate the method for determining the temperature of thin-plate thermal straightening combining laser measurement and finite element simulation into a module and embed it into the digital twin model, and call this module to determine the temperature of thermal straightening;

[0012] Step S4: Calculate the actual temperature on the surface of the thin plate through the matching relationship model between the flame and the frontal water cooling flow rate;

[0013] Step S5: Adjust the frontal water cooling flow rate in real time according to the temperature of thermal straightening obtained by simulation, simulate the thermal straightening on the digital twin model based on the above data, and plan the overall process plan;

[0014] Step S6: Finally, perform thermal straightening on the thin-plate segment according to the formulated process plan during the actual production process to complete the thermal straightening task.

[0015] Preferably, in step S2, if correction is not required, the thermal straightening task is ended.

[0016] Preferably, in step S3, encapsulating the method for determining the temperature of thin-plate thermal straightening combining laser measurement and finite element simulation into a module and embedding it into the digital twin model, and calling this module to determine the temperature of thermal straightening includes:

[0017] Step S31: For the thin-plate segment, use a laser measurement device to scan the segment to be thermally straightened;

[0018] Step S32: Import the scanned data into the 3D measurement system to obtain the three-dimensional nephogram of the thin-plate segment, and analyze the deformation amount through software to generate the corresponding deformation nephogram;

[0019] Step S33: On this basis, establish a finite element model of the thin-plate segment, input the basic material property parameters, force boundary conditions, etc., and divide the model mesh;

[0020] Step S34: Use a subroutine to simulate the thermal straightening process and set the initial temperature function;

[0021] Step S35: Simulate the thermal straightening process through finite element simulation, obtain the plate shape after thermal straightening, and judge whether the accuracy requirement is met;

[0022] Step S36: If the requirements are met, obtain the optimal thermal straightening temperature function through multiple iterative calculations and save the result to the empirical database.

[0023] Preferably, in step S36, if the requirements are not met, adjust the temperature function, update the finite element simulation model, and repeat step S35 until the requirements are met.

[0024] The beneficial effects of the present invention are as follows: The present invention encapsulates the method for determining the thermal straightening temperature of thin plates based on laser measurement and finite element simulation into a module and embeds it into the digital twin model. By calling this module to determine the thermal straightening temperature and combining it with finite element simulation, the thermal straightening temperature can be reasonably predicted before thermal straightening, providing a scientific basis for thermal straightening and reducing the phenomenon of secondary rework caused by insufficient experience. By planning the thermal straightening process plan through the digital twin system, the purpose of precise leveling of thin plates in segments is achieved, improving the quality and efficiency of thermal leveling. Description of the Drawings

[0025] Figure 1 is a flowchart of a method for thermal straightening of deformed thin plates of ships based on digital twin according to the present invention;

[0026] Figure 2 is a specific flowchart of the method for determining the thermal straightening temperature of thin plates based on laser measurement and finite element simulation according to the present invention, which is encapsulated into a module and embedded into the digital twin model, and this module is called to determine the thermal straightening temperature. Detailed Embodiments

[0027] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings. In the description of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] The main technical problems to be solved currently are mainly due to the relatively poor bending strength of thin plates. During the processes of welding, hoisting, and overall assembly of thin plate segments, certain deformations will occur, which will reduce the geometric accuracy and structural strength of the ship's structure and lead to a decline in the structural fatigue performance. Therefore, it is crucial to adopt appropriate methods to correct the deformation of thin plates. However, the current mainstream thermal straightening mainly relies on the experience of operators, there is no scientific basis for the straightening amount, it is difficult to determine the straightening temperature, and the phenomenon of secondary rework often occurs, and the straightening efficiency is low. Therefore, it is necessary to upgrade and improve the existing thermal straightening methods. Therefore, a thermal straightening method for ship thin plate deformation based on digital twin is provided.

[0030] As Figure 1 shown, a thermal straightening method for ship thin plate deformation based on digital twin includes:

[0031] Step S1, obtain the data of the hull thin plate segment through the data acquisition system, map the physical model on site to the virtual world, and construct a digital twin model of the hull thin plate segment.

[0032] Step S2, extract the deformation nephogram of each segment, and analyze whether each thin plate segment needs to be straightened through the deformation nephogram.

[0033] In the embodiment, if no straightening is required, the thermal straightening task is ended.

[0034] Step S3, if necessary, encapsulate the thin plate thermal straightening temperature determination method combining laser measurement and finite element simulation into a module and embed it into the digital twin model, and call this module to determine the thermal straightening temperature.

[0035] As Figure 2 shown, encapsulate the thin plate thermal straightening temperature determination method combining laser measurement and finite element simulation into a module and embed it into the digital twin model, and call this module to determine the thermal straightening temperature, including:

[0036] Step S31, for the thin plate segment, use a laser measurement device to scan the segment to be thermally straightened.

[0037] Step S32, import the scanned data into the 3D measurement system to obtain the three-dimensional nephogram of the thin plate segment, and analyze the deformation amount through software to generate the corresponding deformation nephogram.

[0038] Step S33, on this basis, establish a finite element model of the thin plate segment, input the basic material property parameters, force boundary conditions, etc., and divide the model mesh.

[0039] Step S34, use a subroutine to simulate the thermal straightening process and set the initial temperature function.

[0040] Step S35: Simulate the thermal straightening process through finite element simulation to obtain the plate shape after thermal straightening, and determine whether the accuracy requirement is met.

[0041] Step S36: If the requirement is met, obtain the optimal thermal straightening temperature function through multiple iterative calculations, and save the result to the experience database.

[0042] In the embodiment, if the requirement is not met, adjust the temperature function, update the finite element simulation model, and repeat Step S35 until the requirement is met.

[0043] Step S4: Calculate the actual temperature on the surface of the thin plate through the matching relationship model between the flame and the front water cooling flow rate.

[0044] Step S5: Adjust the front water cooling flow rate in real time according to the thermal straightening temperature obtained from the simulation, simulate the thermal straightening in the digital twin model based on the above data, and plan the overall process plan.

[0045] Step S6: Finally, perform thermal straightening on the thin plate in segments according to the formulated process plan during the actual production process to complete the thermal straightening task.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for pyrotechnic correction of ship thin plate deformation based on digital twin, characterized in that: include: Step S1, acquiring data of the hull thin plate segment through a data acquisition system, mapping the on-site physical model into the virtual world, and constructing a digital twin model of the hull thin plate segment; Step S2, extracting the deformation cloud map of each segment, and analyzing whether each thin plate segment needs correction through the deformation cloud map; Step S3: if necessary, the method for determining the pyrotechnic correction temperature of a thin plate based on the combination of laser measurement and finite element simulation is packaged into a module and embedded into the digital twin model, and the module is called to determine the pyrotechnic correction temperature; Step S4, calculating the actual surface temperature of the thin plate through a matching relationship model between the flame and the front water cooling flow rate; Step S5, adjusting the front water cooling flow rate in real time according to the pyrotechnic correction temperature obtained by simulation, simulating the pyrotechnic correction in the digital twin model based on the above data, and planning the overall process plan; Step S6, finally in the actual production process, the thin plate segments are pyrotechnically corrected according to the formulated process plan to complete the pyrotechnical correction task.

2. The method for pyrotechnic correction of ship thin plate deformation based on digital twin according to claim 1 is characterized in that: In the step S2, if correction is not required, the pyrotechnic correction task is terminated.

3. The method for pyrotechnic correction of ship thin plate deformation based on digital twin according to claim 1 is characterized in that: In the step S3, the method for determining the pyrotechnic correction temperature of a thin plate based on the combination of laser measurement and finite element simulation is encapsulated into a module and embedded into the digital twin model, and the module is called to determine the pyrotechnic correction temperature, including: Step S31, for the thin plate segment, use a laser measuring device to scan the segment to be blasted; Step S32, importing the scanned data into a 3D measurement system to obtain a three-dimensional cloud map of the thin plate segment, and analyzing the deformation through software to generate a corresponding deformation cloud map; Step S33, on this basis, establish a finite element model of the thin plate segment, input basic material property parameters, force boundary conditions, etc., and divide the model grid; Step S34, using a subroutine to simulate the pyrotechnic correction process and set an initial temperature function; Step S35, simulating the pyrotechnic correction process by finite element simulation, obtaining the plate shape after pyrotechnic correction, and judging whether the accuracy requirement is met; Step S36: If the requirements are met, the optimal pyrotechnic correction temperature function is obtained through multiple iterative calculations, and the results are saved in the experience database.

4. The method for pyrotechnic correction of ship thin plate deformation based on digital twin according to claim 3 is characterized in that In, In step S36, if the requirement is not met, the temperature function is adjusted and the finite element simulation model is updated. Repeat step S35 until the requirement is met.

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