Hydraulic flow channel structure optimization method and device for dock folding mechanism and computer equipment

Abstract

The application discloses a kind of hydraulic flow channel structure optimization method, device and computer equipment of dock folding mechanism, comprising: the shape of hydraulic flow channel structure is optimized design;Adopt fluid simulation module to carry out three-dimensional flow field simulation analysis, calculate total pressure loss coefficient and wall surface pressure;Further optimize to the curve transition design;Further optimized hydraulic flow channel structure is introduced into structure analysis module, and response simulation analysis is carried out, and response point acceleration is extracted;According to the response point acceleration and frequency response function extracted in response simulation analysis, the acceleration frequency response curve of the hydraulic flow channel structure is obtained;According to the vibration load characteristics, a buffer structure is designed at the impact occurrence place.Based on fluid simulation analysis, structure harmonic response analysis, finite element simulation is carried out, CFD topological optimization is carried out, etc., combined with simulation analysis, based on additive manufacturing technology, the shape of shell internal flow channel and filling special designed dot matrix structure are optimized to reduce hydraulic impact, and buffer vibration absorption design is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of computer-aided and simulation design, in particular to a ship dock folding device hydraulic pipeline structure optimization method and device and computer equipment. BACKGROUND

[0002] With the development of ship and ocean engineering technology, shipbuilding equipment has also been well developed. The ship dock folding mechanism is an important facility for the manufacture and maintenance of marine engineering equipment such as ships in the ship dock. However, as the key subsystem of the ship dock folding mechanism, the hydraulic system's hydraulic flow passage bears high pressure and various load vibrations, which affects its service life. In particular, the positions where the flow is not smooth, such as sudden changes in hole diameter and bends, will cause strong hydraulic excitation. These impacts not only cause forced vibration of the flow passage shell, but also cause forced vibration of the supporting structure. This seriously affects the performance and service life of various key components in the hydraulic system and the performance of the actuator, increases the system failure rate, and reduces the reliability and stability of the hydraulic system. SUMMARY

[0003] In view of the above defects or improvement needs of the prior art, the present application provides a ship dock folding mechanism hydraulic flow passage structure optimization method and device and computer equipment, based on fluid simulation analysis and structural harmonic response analysis, using "AI surrogate model" and "voxel method" for finite element simulation, CFD topology optimization, etc., combining theoretical simulation, simulation analysis and experiments, based on additive manufacturing technology, optimizing the shape of the flow passage inside the shell and filling the specially designed lattice structure to reduce hydraulic impact and achieve buffer vibration absorption design.

[0004] To achieve the above purpose, the present application adopts the following technical solutions.

[0005] In some embodiments, a ship dock folding mechanism hydraulic flow passage structure optimization method is provided, the hydraulic flow passage structure is based on additive manufacturing technology, and the method comprises:

[0006] Optimizing the shape of the hydraulic flow passage structure, the optimization design comprising using a curved transition design to replace the flow passage of the drilling process;

[0007] Using a fluid simulation module to perform three-dimensional flow field simulation analysis and calculate the total pressure loss coefficient and wall pressure;

[0008] Further optimizing the curved transition design according to the total pressure loss coefficient and wall pressure;

[0009] Importing the further optimized hydraulic flow passage structure into a structure analysis module to perform response simulation analysis and extract the response point acceleration;

[0010] According to the response point acceleration and the frequency response function extracted in the response simulation analysis, an acceleration frequency response curve of the hydraulic flow channel structure is obtained.

[0011] According to the vibration load characteristics at the impact occurrence place, a buffer structure is designed, and the vibration load characteristics include an acceleration frequency response curve.

[0012] In some embodiments, the buffer structure includes a shell and a filling lattice.

[0013] In some embodiments, the method includes: calculating the natural frequency of the lattice according to a resonance formula, adjusting the natural frequency of the lattice through the type, geometric parameters and distribution density of the lattice unit cell, and combining the natural frequency of the lattice with the natural frequency of the hydraulic flow channel structure, so that the natural frequency of the overall structure of the hydraulic flow channel is greater than a preset threshold from the vibration frequency generated by the liquid flow.

[0014] In some embodiments, the method further includes:

[0015] After the shell thickness of the hydraulic flow channel structure and the lattice model are determined, the shell and the lattice model are combined into an overall structure of the hydraulic flow channel, and finite element simulation is performed on the overall structure model of the hydraulic flow channel.

[0016] According to the results of the finite element simulation, the shell and the lattice design of the hydraulic flow channel structure are reversely optimized and iterated, so that the buffer and vibration reduction performance meets the design requirements.

[0017] In some embodiments, the finite element simulation on the overall structure model of the hydraulic flow channel includes: using an AI surrogate model and a voxel method to perform the finite element simulation.

[0018] The AI surrogate model is an equivalent substitution of attribute parameters of the lattice structure through an artificial intelligence algorithm, which equivalently substitutes the lattice structure into a continuum, and performs finite element simulation based on the continuum.

[0019] The voxel method is a voxel-based three-dimensional modeling method, which divides the hydraulic flow channel structure into multiple cubes, and then constructs a three-dimensional model according to the position and color information of the cubes.

[0020] In some embodiments, the method further includes: comprehensively considering the vibration absorption and heat conduction performance to design the lattice structure, and the lattice structure design includes:

[0021] Analyzing the heat source, boundary heat condition, material thermal conductivity and heat exchange coefficient of the hydraulic flow channel structure, and establishing a simplified cell finite element model considering the vibration absorption and heat conduction working conditions;

[0022] Topologically optimizing the lattice cell.

[0023] According to the flow channel surface friction force distribution law of the hydraulic flow channel structure, selectively arrange the vibration-absorbing heat point array between the inner wall and the outer wall.

[0024] In some embodiments, the method according to the flow channel surface friction force distribution law of the hydraulic flow channel structure, selectively arranging the vibration-absorbing heat point array between the inner wall and the outer wall, comprises:

[0025] In the area where the inner wall friction is large, the structure is thickened, and more vibration-absorbing heat point arrays are designed;

[0026] In the area where the inner wall friction is uniform or small, the vibration-absorbing or stiffness optimal point array is used.

[0027] In some embodiments, the method further comprises, according to the temperature field distribution result of CFD, adding a heat dissipation structure, the heat dissipation structure being one or more of an external cooling fin, an external cooling point array, and an internal circulating cooling system.

[0028] Some embodiments of the present application also provide a ship dock folding mechanism hydraulic flow channel structure optimization device, the hydraulic flow channel structure is based on additive manufacturing technology, and the device comprises:

[0029] A hydraulic flow channel structure shape design module is used for optimizing the shape of the hydraulic flow channel structure, and the optimization design comprises using a curve transition design to replace a flow channel drilled by a drilling process;

[0030] A fluid simulation module is used for three-dimensional flow field simulation analysis, calculation of total pressure loss coefficient and wall pressure;

[0031] A hydraulic flow channel structure optimization design module is used for further optimization of the curve transition design according to the total pressure loss coefficient and the wall pressure;

[0032] A structure analysis module is used for importing the further optimized hydraulic flow channel structure into the structure analysis module, performing response simulation analysis, and extracting response point acceleration;

[0033] A frequency response curve acquisition module is used for obtaining the acceleration frequency response curve of the hydraulic flow channel structure according to the response point acceleration extracted in the response simulation analysis and the frequency response function;

[0034] A buffer structure design module is used for designing a buffer structure at the impact occurrence according to the vibration load characteristics.

[0035] Some embodiments of the present application also provide a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to realize the steps of the method of any one of the above.

[0036] Compared with the prior art, the beneficial effects of the present application are: in the embodiment of the present application, the hydraulic flow channel structure of the dock folding mechanism is based on additive manufacturing technology, based on fluid simulation analysis and structural harmonic response analysis, finite element simulation is carried out by using "AI surrogate model" and "voxel method", CFD topology optimization is carried out, and the shape of the internal flow channel of the shell is optimized and the special designed lattice structure is filled to reduce hydraulic impact, so as to realize the buffer vibration absorption design of the hydraulic flow channel structure of the dock folding mechanism and reduce the vibration noise caused by pressure pulsation and pressure mutation. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 The overall flowchart of the dock folding mechanism hydraulic flow channel structure optimization method of an embodiment of the present application is shown.

[0038] Figure 2 The local and traditional scheme comparison diagram of the optimized hydraulic flow channel structure of an embodiment of the present application is shown.

[0039] Figure 3 The three-dimensional flow field simulation analysis diagram of the optimized pipeline compared with the traditional pipeline of an embodiment of the present application is shown.

[0040] Figure 4 The internal flow field distribution diagram of the hydraulic flow channel structure shell using the optimized pipeline compared with the traditional pipeline of an embodiment of the present application is shown.

[0041] Figure 5 The internal flow line distribution diagram of the hydraulic flow channel structure shell using the optimized pipeline compared with the traditional pipeline of an embodiment of the present application is shown.

[0042] Figure 6 The stress curve diagram of the hydraulic flow channel structure compared with the traditional pipeline of an embodiment of the present application is shown.

[0043] Figure 7 The vibration acceleration spectrum diagram of the hydraulic flow channel structure compared with the traditional pipeline of an embodiment of the present application is shown.

[0044] Figure 8 The vibration frequency response curve of the hydraulic flow channel structure compared with the traditional pipeline of an embodiment of the present application is shown.

[0045] Figure 9 The schematic diagram of the impact site of the hydraulic flow channel structure of an embodiment of the present application is shown.

[0046] Figure 10 The schematic diagram of the AI surrogate model converting the lattice into a continuum of an embodiment of the present application is shown.

[0047] Figure 11 The flow channel CFD topology optimization diagram of an embodiment of the present application is shown.

[0048] Figure 12 A schematic view of a hydraulic passage structure optimization device of a dock folding mechanism according to an embodiment of the present application.

[0049] Figure 13 A schematic view of an electronic device according to an embodiment of the present application.

[0050] Figure 14 A schematic view of a hydraulic system structure of a dock folding mechanism according to an embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0052] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the features of different embodiments or examples and the features of different embodiments or examples described in the present application without contradiction.

[0053] In some embodiments of the present application, the hydraulic system of the dock folding mechanism is composed of Figure 14As shown, the structural vibration is mainly caused by pressure pulsation (when working normally) and pressure mutation (start-stop and reversal). The pulsating flow acts on the internal flow passage of the hydraulic flow passage structure shell to generate pressure pulsation, which not only causes periodic forced vibration of the flow passage, but also causes periodic forced vibration of the supporting structure of the shell, causing micro-motion wear on the surface of the supporting structure, gradually reducing the supporting stiffness, thereby reducing the natural frequency of the structure, until the pressure pulsation frequency is close to or coincides with the pressure pulsation frequency, then the fluid-structure coupling vibration is generated, which affects the performance and service life of the entire hydraulic system. When the hydraulic system is started, stopped, or reversed, that is, when the control valve port is closed or the actuator suddenly stops, due to the inertia of the flowing liquid and the moving parts, the mechanical energy of the flowing liquid and the moving parts is temporarily converted into the pressure energy of the system, and a very high instantaneous peak pressure is formed in the system, causing hydraulic impact, especially at positions where the flow is not smooth, such as sudden changes in hole diameter and bends, which will cause strong hydraulic excitation. These impacts not only cause forced vibration of the shell, but also cause forced vibration of the shell supporting structure. It seriously affects the performance and service life of the actuator and various key components in the hydraulic system, increases the failure rate of the system, and reduces the reliability and stability of the system. Especially in high-pressure, high-speed and large-flow systems, the consequences are more serious.

[0054] In an embodiment of the present application, the hydraulic flow passage structure of the dock folding mechanism is based on additive manufacturing technology, and a special designed dot matrix structure is filled in the internal flow passage of the shell to reduce hydraulic impact and achieve the shock absorption design of the hydraulic flow passage structure of the dock folding mechanism, thereby reducing the vibration noise caused by pressure pulsation and pressure mutation.

[0055] Figure 1 The overall flowchart of the dock folding mechanism hydraulic flow passage structure optimization method of an embodiment of the present application is shown in FIG. 1. Figure 1 As shown in some embodiments, a dock folding mechanism hydraulic flow passage structure optimization method is provided, the hydraulic flow passage structure is based on additive manufacturing technology, and the method comprises:

[0056] The shape of the hydraulic flow passage structure is optimized, and the optimization design comprises using a curved transition design to replace the flow passage of the drilling process;

[0057] A three-dimensional flow field simulation analysis is performed using a fluid simulation module to calculate the total pressure loss coefficient and the wall surface pressure;

[0058] The curved transition design is further optimized according to the total pressure loss coefficient and the wall surface pressure;

[0059] The further optimized hydraulic flow passage structure is introduced into a structure analysis module for response simulation analysis, and the response point acceleration is extracted;

[0060] According to the response point acceleration and frequency response function extracted in the response simulation analysis, the acceleration frequency response curve of the hydraulic flow channel structure is obtained.

[0061] According to the vibration load characteristics, a buffer structure is designed at the impact occurrence position, and the vibration load characteristics include the acceleration frequency response curve.

[0062] Figure 2 The local comparison (compared with the traditional scheme) schematic diagram of the optimized hydraulic flow channel structure of an embodiment of the present application is shown in FIG. Figure 2 The traditional hydraulic flow channel structure shell mainly drills holes on the blank to form the flow channel structure. For the machining of complex flow channels, a process hole is often needed. It is difficult to remove burrs at the intersection of the hole. Due to the existence of the chamfer hole and the eccentricity of the inlet and outlet flow channels, vortexes are formed in the hydraulic oil through the tool tip cavity and the corner (as shown in (a) of FIG. Figure 2 In the embodiment of the present application, the optimized design of the flow channel makes the flow channel (as shown in (b) of FIG. Figure 2 ) with sufficient curve transition can effectively reduce the oil vortex and impact caused by the process hole cavity and reduce the pressure loss and vibration of the oil flow. In the embodiment of the present application, the hydraulic flow channel structure is based on the additive manufacturing technology, which overcomes the problem that it is difficult to realize machining by using traditional machining or casting means, so that the flow channel with curve transition design instead of drilling process becomes possible.

[0063] In some embodiments, Ansys Fluent software can be used as a tool for three-dimensional flow field simulation, and the modified K-e turbulence model is selected for the turbulence model. The calculation is solved by using the uncoupled implicit scheme, the space is discretized by using the finite volume method, the second-order central difference format is applied to the source term and the diffusion term in the control equation, and the second-order upwind format is applied to the flow term. The commonly used anti-wear oil hydraulic oil (mining type hydraulic oil L-HM) is used as the medium in the calculation, the medium density is 870 kg / m, and the dynamic viscosity is 0.04002 PaS. The boundary condition is set as the velocity inlet and the pressure outlet. The inlet velocity V=IF(t<0.02, 0, 10 m / s), the current model flow channel is extracted, and the total pressure loss coefficient and the wall pressure are calculated by direct comparison.

[0064] Figure 3 The three-dimensional flow field simulation analysis schematic diagram of the traditional pipeline (as shown in (a) of FIG. Figure 3 ) and the optimized pipeline (as shown in (b) of FIG. Figure 3 ) is shown in FIG. According to the calculation results, the pressure loss of the optimized flow channel is reduced by 27% compared with the traditional machining flow channel, and the impact force is reduced by 30%.

[0065] Figure 4 The internal flow field distribution diagram of the hydraulic flow channel structure shell using the traditional pipeline (as shown in FIG. Figure 4(as shown in Figure (a)) and the internal flow field distribution diagram of the hydraulic flow channel structure shell with optimized piping (as shown in Figure (a)). Figure 4 (as shown in (b)). Figure 5 This is a diagram showing the internal streamline distribution of a hydraulic flow channel structure using traditional piping (e.g., Figure 5 (as shown in Figure (a)) and the internal streamline distribution diagram of the hydraulic flow channel structure shell with optimized piping (as shown in Figure (a)). Figure 5 (As shown in (b)). The calculation results show that the optimized hydraulic flow channel structure shell reduces the total pressure loss by 35.4% compared to the traditional structure.

[0066] Figure 6 The diagram shows the stress curve of the hydraulic flow channel structure. The calculation results show that the overall stress of the optimized hydraulic flow channel structure is reduced by 26.7% compared to the traditional structure, and the maximum stress on the wall surface is reduced by 22.5%.

[0067] The further optimized hydraulic flow channel structure is imported into the structural analysis module for response simulation analysis, extracting the acceleration at response points. Specifically, the results of the fluid calculations are imported into the structural analysis module for harmonic response analysis, including first-order modal analysis and harmonic response analysis at 100Hz, and the vibration acceleration spectrum is obtained (e.g., Figure 7 (As shown).

[0068] According to the definition of the frequency response function, for any test point, its acceleration frequency response can be expressed as: the logarithm (base 10) of the ratio of vibration acceleration to reference acceleration multiplied by 20, denoted as VAL, with the unit being decibels (dB). This can be expressed as a formula according to the definition:

[0069] In the formula: a is the effective value of vibration acceleration, in m / s². 2 a0 is the reference acceleration, a0 = 10. -6 m / s 2 .

[0070] The above formula allows us to substitute the acceleration and excitation force extracted from the simulation into the calculation, yielding the acceleration frequency response curve of the structure, as shown below. Figure 8 As shown in the figure, the vibration sound pressure level decreased from 92dB to 85dB after pipeline optimization, a reduction of approximately 7%.

[0071] like Figure 9 As shown, in some embodiments, a buffer structure is designed at the impact site based on vibration load characteristics, including an acceleration frequency response curve. The buffer structure includes a shell and a filled lattice. Based on the acceleration frequency response curve, if the acceleration frequency response exceeds a threshold, a buffer structure can be designed at the impact site in conjunction with wall pressure. In the embodiments of this application, a personalized buffer structure is designed at the impact site based on the characteristics of the vibration load, using a shell and a filled lattice to reduce local stiffness and decrease impact.Figure 9 As shown in the figure, (a) is a schematic diagram of a solid section, (b) is a local enlarged view, and (c) is a schematic diagram of a local shell extraction and filling lattice processing. Specifically, a buffer structure can be designed at the flow direction change or the flow cross-sectional area change. In some embodiments, the buffer performance data of the lattice can be determined by experiment. A lattice sample is printed using a selected metal material, and the lattice is placed on the experimental platform. The height of the drop hammer is set, the lattice is impacted by free fall, the deformation of the lattice is detected by DIC (digital image correlation technology) speckle strain measurement, and the elastic deformation energy of the lattice is calculated according to the detection result, so as to evaluate the buffer performance of the lattice.

[0072] In some embodiments, the method comprises: calculating the natural frequency of the lattice according to the resonance formula, adjusting the natural frequency of the lattice by the type, geometric parameters and distribution density of the lattice unit cell, and combining the natural frequency of the lattice with the natural frequency of the hydraulic flow channel structure, so that the natural frequency of the overall structure of the hydraulic flow channel is greater than a preset threshold from the vibration frequency generated by the liquid flow.

[0073] Specifically, the natural frequency of the overall structure of the hydraulic flow channel can be obtained by the following way:

[0074] (1) Preliminary design of the shell and lattice model of the hydraulic flow channel structure, and printing of the solid test sample according to the model;

[0075] (2) Determine the boundary conditions of the hydraulic flow channel structure test piece. The assembly surface of the hydraulic flow channel structure is connected and fixed by the way of general assembly design;

[0076] (3) The hydraulic flow channel structure test piece is hit by a force hammer, and an acceleration sensor is used to detect the vibration signal;

[0077] (4) The natural frequency is read by fast Fourier transform (FFT) processing of the acceleration signal.

[0078] For the natural frequency of the lattice, the frequency of the lattice is adjusted by the type, geometric parameters and distribution density of the lattice unit cell. The natural frequency of the lattice is related to its stiffness, and the vibration state thereof can be described by the resonance formula as follows:

[0079]

[0080] Where f represents the frequency of vibration, k represents the stiffness of the system, and m represents the mass of the system. The stiffness of the lattice is determined by the uniaxial tensile test of the lattice tensile sample. The deformation in the elastic deformation stage and the increment of tensile force are detected by the tensile test, and the elastic modulus, i.e. the stiffness of the lattice, is obtained by dividing the two.

[0081] After the common lattice inherent frequency is known, the inherent frequency of the lattice and the inherent frequency of the structure are combined, so that the inherent frequency of the overall structure of the hydraulic flow channel is far away from the vibration frequency generated by the liquid flow, thereby achieving the purpose of avoiding resonance and reducing amplitude.

[0082] In some embodiments, the method further comprises:

[0083] After the shell thickness of the hydraulic flow channel structure and the lattice model are determined, the shell and the lattice model are combined into an overall structure of the hydraulic flow channel, and finite element simulation is performed on the overall structure model of the hydraulic flow channel.

[0084] According to the results of the finite element simulation, the shell and the lattice design of the hydraulic flow channel structure are iteratively optimized in reverse, so that the cushioning and vibration reduction performance meets the design requirements.

[0085] In some embodiments, the finite element simulation on the overall structure model of the hydraulic flow channel comprises: using an AI substitute model and a voxel method to perform the finite element simulation.

[0086] The AI substitute model is an equivalent substitution of attribute parameters of the lattice structure by an artificial intelligence algorithm, which equivalently substitutes the lattice structure into a continuum, and performs finite element simulation based on the continuum.

[0087] The voxel method is a voxel-based three-dimensional modeling method, which divides the hydraulic flow channel structure into a plurality of cubes, and then constructs a three-dimensional model according to the position and color information of the cubes.

[0088] After the shell thickness of the hydraulic flow channel structure and the lattice model are determined, the shell and the lattice model are combined into an overall structure of the hydraulic flow channel, and finite element simulation is performed on the model. The finite element simulation with the lattice model has the problems of large amount of finite elements and long calculation time. In the embodiments of the present application, the "AI substitute model" and "voxel method" schemes are used to perform simulation.

[0089] The "AI substitute model" is an equivalent substitution of attribute parameters of the lattice structure by an artificial intelligence algorithm, which equivalently substitutes the lattice structure into a continuum (such as Figure 10 ), and performs finite element simulation based on the continuum, thereby greatly reducing the amount of calculation; the "voxel method" is a voxel-based three-dimensional modeling method, which divides the hydraulic flow channel structure into a plurality of small cubes, and then constructs a three-dimensional model according to the position and color information of the cubes. This method has a faster calculation speed than the finite element method.

[0090] According to the results of the simulation, the shell and the lattice design of the hydraulic flow channel structure are iteratively optimized in reverse, so that the cushioning and vibration reduction performance meets the design requirements. After the numerical simulation results meet the requirements, special experiments are performed to verify the cushioning and vibration absorption performance.

[0091] In the special verification experiment, the printed hydraulic flow channel structure entity is connected according to the actual environmental water pressure and internal hydraulic working condition. The valve is opened and closed according to the frequency, and the acceleration sensor and other equipment are used to detect the impact and vibration amplitude of the hydraulic flow channel structure entity under the actual working condition. The DIC speckle strain measuring instrument is used to detect the local deformation of the entity. The data is collected and compared with the expected value of the design for analysis.

[0092] In the embodiments of the present application, additive manufacturing is used as the processing method of the hydraulic flow channel structure, which can make more novel structures applicable. Since the high-speed flowing hydraulic oil will rub against the inner wall surface, the heat dissipation problem of the hydraulic flow channel structure also needs to be considered. By designing the hydraulic flow channel structure to contain a dot matrix structure inside, it can have more excellent performance in noise reduction and sound absorption. However, the hollow dot matrix hinders heat dissipation.

[0093] In some embodiments of the present application, the method further comprises optimizing the hydraulic flow channel structure to improve the heat dissipation performance under the premise of ensuring the vibration absorption and noise reduction performance. In some embodiments, optimizing the hydraulic flow channel structure to improve the heat dissipation performance comprises one or more of flow channel design, pipe wall dot matrix structure design, and heat dissipation structure design.

[0094] In some embodiments, optimizing the hydraulic flow channel structure comprises flow channel design.

[0095] Specifically, in some embodiments, first, from the source of heat generation, the main reason for the heating of the hydraulic flow channel structure is the friction between the fluid and the inner wall. Some embodiments of the present application optimize the design of the flow channel during the design process. According to the control requirements of the hydraulic system, the inlet and outlet of the flow channel are designed, and then the minimum flow loss is used as the optimization target in the design domain, such as Figure 11 As shown in FIG. 1, the CFD (Computational Fluid Dynamics) topology optimization method is used to optimize the design of the flow channel to remove backflow and reduce flow loss. The CFD topology optimization method first creates a design space, and the software algorithm automatically optimizes in this space, gradually removes the redundant space volume, and finds the best flow channel shape. Specifically, the computer software can be used to topologically optimize the flow channel. The fluid-related variables (such as flow resistance, efficiency, heat transfer coefficient, etc.) are used as the optimization target, and the optimization is based on free shape, size parameter, physical property parameter, boundary condition, etc. Finally, the flow channel layout scheme with uniform fluid velocity, minimum total friction force of pipe wall, or minimum friction force is designed to reduce the friction heating of high-pressure oil.

[0096] In some embodiments, optimizing the hydraulic flow channel structure comprises pipe wall dot matrix structure design.

[0097] Specifically, in some embodiments, the method further comprises: considering the vibration absorption and heat conduction performance to design the dot matrix structure, and the dot matrix structure design comprises:

[0098] analyzing the heat source, boundary heat condition, material thermal conductivity and heat exchange coefficient of the hydraulic flow channel structure, and establishing a simplified cell finite element model considering the vibration absorption and heat conduction working conditions;

[0099] topology optimizing the dot matrix cell;

[0100] selectively arranging the vibration absorption and heat conduction dot matrix between the inner wall and the outer wall according to the flow channel surface friction force distribution law of the hydraulic flow channel structure.

[0101] When the hydraulic flow channel structure considers vibration absorption and noise reduction, the structure is designed to have a certain thickness of the inner and outer walls, and the dot matrix structure is used to link between the inner and outer walls. Although the existence of the dot matrix gap can greatly improve the vibration absorption effect, the bubbles in the gap will hinder the heat conduction to a certain extent. In the embodiments of the present application, the vibration absorption and heat conduction performance are considered to design the dot matrix structure.

[0102] Specifically, in some embodiments, first, the heat source, boundary heat condition, material thermal conductivity, heat exchange coefficient and other parameters of the structure are analyzed, and a simplified cell finite element model considering the vibration absorption, heat conduction and other working conditions is established.

[0103] Then, the dot matrix cell is topology optimized. The fixed porosity is taken as the constraint condition, the maximum thermal conductivity is taken as the optimization target, the periodic symmetric boundary condition is used to establish the load, vibration absorption and heat transfer finite element model of a single cell, the single cell is topology optimized, and the cell with the best vibration absorption and heat conduction effect is found out. After the model is determined, the selected material is used to print the dot matrix test block, and the vibration absorption and heat dissipation performance special verification is carried out. By comparing the numerical simulation and experimental results, the vibration and thermal model of the numerical simulation is corrected according to the experimental results, and the relationship equation truly reflecting the structure vibration reduction and heat dissipation performance is established. According to the measured results, the model design and processing method for optimizing the dot matrix vibration absorption and heat dissipation function are proposed, the structure of the ideal dot matrix configuration is determined, and the parameterized model of the cell is established.

[0104] In some embodiments, the vibration absorption and heat conduction dot matrix is selectively arranged between the inner wall and the outer wall according to the flow channel surface friction force distribution law of the hydraulic flow channel structure, which comprises:

[0105] thickening the structure in the area with large inner wall friction force, and designing more vibration absorption and heat conduction dot matrices;

[0106] vibration absorption or stiffness optimal dot matrix is used in the area with uniform or small inner wall friction force.

[0107] In the embodiments of the present application, after the overall structure of the hydraulic flow channel is established according to the flow channel structure, according to the distribution law of the surface friction of the flow channel, the vibration-absorbing and heat-conducting point arrays are selectively arranged between the inner wall and the outer wall. The structure is thickened in the area where the inner wall friction is large, and more vibration-absorbing and heat-conducting point arrays are designed. In the area where the inner wall friction is uniform or small, the vibration-absorbing or stiffness-optimal point array is used. Through the field-driven design method, the point array structure presents different point arrays in different areas, and the gradient transition effect between the areas.

[0108] In some embodiments, optimizing the hydraulic flow channel structure includes heat dissipation structure design.

[0109] Specifically, in some embodiments, the method further includes, according to the temperature field distribution result of CFD, adding a heat dissipation structure, the heat dissipation structure being one or more of an external fin, an external heat dissipation point array, and an internal circulating cooling system.

[0110] In some embodiments, according to the temperature field distribution result of CFD, an external fin can be added in the high-temperature area. Specifically, according to the temperature gradient as the basis, the optimal fin shape on the plane and the cylindrical surface is designed by means of topology optimization method, which can guide the heat of the high-temperature area to the low-temperature area, and increase the contact area with seawater by means of the fin, further improving the heat dissipation effect.

[0111] In some embodiments, in addition to improving the heat dissipation performance by the fin, a point array structure can be used on the outer wall to improve the heat dissipation. According to the temperature field obtained by CFD, a TPMS (Triply Periodic Minimal Surface, three-periodic minimal surface) heat dissipation point array is designed on the outer surface. It has a novel architecture, a mutual connection and a porous topology structure and a high surface-to-volume ratio, and the cell structure based on TPMS can enhance the heat exchange mechanism and can maximize the heat dissipation area.

[0112] In some embodiments, additive manufacturing can design a high-complexity product structure, and in the hydraulic flow channel structure, a cooling circuit can be designed along the flow channel surface to further improve the heat dissipation effect. According to the temperature field of the flow channel CFD, the cooling circuit is designed to transport the heat of the local heating position to the low-temperature area, and the corresponding pump-driven cooling water is appropriately increased. Combined with the working environment of the hydraulic system, an internal circulating cooling water circuit can be used, and seawater is introduced into the cooling circuit, which is heated after passing through the heating area of the hydraulic flow channel structure and then discharged.

[0113] Figure 12 The figure is a schematic diagram of a dock folding mechanism hydraulic flow channel structure optimization device according to an embodiment of the present application. Figure 12Some embodiments of the present application also provide a device for optimizing hydraulic flow channel structure of a dock folding mechanism, the hydraulic flow channel structure is based on additive manufacturing technology, the device comprises:

[0114] a shape design module of the hydraulic flow channel structure, configured to optimize the shape of the hydraulic flow channel structure, the optimization including replacing the flow channel drilling process with a curve transition design;

[0115] a fluid simulation module, configured to perform three-dimensional flow field simulation analysis and calculate total pressure loss coefficient and wall pressure;

[0116] an optimization design module of the hydraulic flow channel structure, configured to further optimize the curve transition design according to the total pressure loss coefficient and the wall pressure;

[0117] a structure analysis module, configured to import the further optimized hydraulic flow channel structure into the structure analysis module, perform response simulation analysis, and extract response point acceleration;

[0118] a frequency response curve acquisition module, configured to obtain the acceleration frequency response curve of the hydraulic flow channel structure according to the response point acceleration extracted in the response simulation analysis and a frequency response function;

[0119] a buffer structure design module, configured to design a buffer structure at the impact occurrence according to vibration load characteristics.

[0120] Some embodiments of the present application also provide a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of the above embodiments when executing the program.

[0121] Reference Figure 13 In some embodiments, an electronic device is also provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the numerical simulation, analysis or control steps in the method according to any one of the above embodiments when executing the program.

[0122] At the hardware level, the electronic device comprises a processor, an internal bus, a network interface, a memory, and a non-volatile memory, and of course can also include other hardware required by the business. The processor reads the corresponding computer program from the non-volatile memory into the memory and then runs to implement the above Figure 1The method described above. Of course, in addition to the software implementation, the present specification does not exclude other implementations, such as logic devices or a combination of software and hardware, and so on, that is, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic device. It can be understood that only the method flow is logically programmed in a hardware description language and programmed into an integrated circuit to obtain a hardware circuit that implements the logic method flow.

[0123] The above method can be implemented in any appropriate manner by a controller, for example, the controller can take the form of a microprocessor or processor and a computer readable medium storing computer readable program code (e.g. software or firmware) executable by the (micro)processor, logic gates, switches, application specific integrated circuits (ASICs), programmable logic controllers and embedded microcontrollers, examples of the controller include but are not limited to microcontrollers, the memory controller can also be implemented as part of the control logic of the memory. It can be understood that in addition to implementing the controller in pure computer readable program code, the controller can also be implemented in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers and embedded microcontrollers to achieve the same function by logically programming the method steps. Therefore, such a controller can be considered as a hardware component, and the means included therein for implementing various functions can also be considered as structures within the hardware component. Alternatively, the means for implementing various functions can be considered as both software modules implementing the method and structures within the hardware component.

[0124] The system, device, module or unit in the above embodiments can be implemented by a computer chip or entity, or by a product with certain functions. A typical implementation device is a computer. Specifically, the computer can be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0125] For the convenience of description, the above device is described as various modules respectively described in terms of functions. Of course, in the implementation of the present specification, the functions of each module can be implemented in the same or more software and / or hardware.

[0126] Those skilled in the art will appreciate that embodiments of the application can be provided as methods, systems, or computer program products. Accordingly, the present specification can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) having computer usable program code embodied in the medium.

[0127] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0128] In some embodiments, a computer readable storage medium storing computer program is also provided, and the computer program is executed by a processor to implement the method described in any one of the above.

[0129] In some embodiments, the computer program instructions can also be stored in a computer readable storage medium capable of guiding a computer or other programmable data processing apparatus to work in a specific way, so that the instructions stored in the computer readable storage medium produce a product including instruction means, which implements the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0130] In some embodiments, the computer program instructions can also be loaded into a computer or other programmable data processing apparatus, so that a series of operational steps are performed on the computer or other programmable apparatus to produce a computer implemented process, so that the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0131] In some embodiments, the computing device includes one or more processors (CPU), input / output interface, network interface and memory.

[0132] In some embodiments, the memory can include non-permanent memory in the computer readable medium, random access memory (RAM) and / or non-volatile memory, such as read only memory (ROM) or flash memory (flash RAM). The memory is an example of the computer readable medium.

[0133] In some embodiments, computer-readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile discs (DVDs) or other optical storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device.

[0134] Those skilled in the art will readily understand that the above description is only the preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for optimizing the hydraulic flow channel structure of a dock folding mechanism, characterized in that, The hydraulic flow channel structure is based on additive manufacturing technology, and the method includes: The shape of the hydraulic flow channel structure is optimized, and the optimization design includes using a curved transition design to replace the drilling process for the flow channel. AnsysFluent software was used to perform three-dimensional flow field simulation analysis and calculate the total pressure loss coefficient and wall pressure. Based on the total pressure loss coefficient and wall pressure, the curve transition design is further optimized; The optimized hydraulic flow channel structure was subjected to harmonic response analysis to extract the acceleration at the response point. Based on the acceleration and frequency response function extracted from the harmonic response analysis, the acceleration frequency response curve of the hydraulic flow channel structure is obtained; A buffer structure is designed at the impact point based on the vibration load characteristics, including the acceleration frequency response curve. The buffer structure includes a shell and a filled dot matrix; The method further includes: designing a lattice structure considering both vibration absorption and thermal conductivity; the lattice structure design includes: The heat source, boundary thermal conditions, material thermal conductivity, and heat transfer coefficient of the hydraulic flow channel structure are analyzed, and a simplified cell finite element model considering vibration absorption and heat conduction conditions is established. Topology optimization of lattice cells; Based on the frictional force distribution law of the hydraulic flow channel structure, a vibration-absorbing and heat-conducting array is selectively arranged between the inner and outer walls, including: The structure is thickened in areas with high friction on the inner wall, and more vibration-absorbing and heat-conducting arrays are designed. In areas where the friction on the inner wall is uniform or low, vibration absorption or stiffness-optimal matrix methods are used. The method further includes: After determining the shell thickness and lattice model of the hydraulic flow channel structure, the combined shell and lattice model constitute the overall structure of the hydraulic flow channel, and finite element simulation is performed on the overall structure model of the hydraulic flow channel. Based on the results of finite element simulation, the shell and lattice structure design of the hydraulic flow channel structure were optimized and iterated to ensure that the buffering and vibration absorption performance met the design requirements. The finite element simulation of the overall structure model of the hydraulic flow channel includes: performing finite element simulation using AI replacement model and voxel method; The AI ​​substitution model is to use artificial intelligence algorithms to make equivalent substitutions of the attribute parameters of the lattice structure, making the lattice structure equivalent to a continuum, and then performing finite element simulation based on the continuum. The voxel method is a voxel-based 3D modeling method that divides the hydraulic flow channel structure into multiple cubes and constructs a 3D model based on the position and color information of the cubes.

2. The hydraulic flow channel structure optimization method according to claim 1, characterized in that, The method further includes: calculating the natural frequency of the lattice according to the resonance formula, adjusting the natural frequency of the lattice by the type, geometric parameters and distribution density of the lattice cells, and combining the natural frequency of the lattice with the natural frequency of the hydraulic flow channel structure so that the natural frequency of the overall hydraulic flow channel structure differs from the vibration frequency generated by the fluid flow by more than a preset threshold.

3. The hydraulic flow channel structure optimization method according to claim 2, characterized in that, The method further includes: designing the inlet and outlet of the hydraulic flow channel according to the control requirements of the hydraulic system, and then optimizing the hydraulic flow channel using computational fluid dynamics (CFD) topology optimization method within the design domain with the minimum flow loss as the optimization objective.

4. The hydraulic flow channel structure optimization method according to claim 3, characterized in that, The method further includes adding a heat dissipation structure based on the temperature field distribution results of CFD, wherein the heat dissipation structure is one or more of the following: external heat sink, external heat dissipation array, and internal circulating cooling system.

5. A device for optimizing the hydraulic flow channel structure of a dock tilting mechanism, characterized in that, The hydraulic flow channel structure is based on additive manufacturing technology, and the device includes: A shape design module for hydraulic flow channel structure is used to optimize the shape design of hydraulic flow channel structure. The optimization design includes using a curved transition design to replace the drilling process for the flow channel. The fluid simulation module is used to perform three-dimensional flow field simulation analysis using AnsysFluent software, and to calculate the total pressure loss coefficient and wall pressure. The hydraulic flow channel structure optimization design module is used to further optimize the curve transition design based on the total pressure loss coefficient and wall pressure. The structural analysis module is used to perform harmonic response analysis on the further optimized hydraulic flow channel structure and extract the acceleration at the response point. The frequency response curve acquisition module is used to obtain the acceleration frequency response curve of the hydraulic flow channel structure based on the acceleration and frequency response function of the response point extracted from the harmonic response analysis. A buffer structure design module is used to design a buffer structure at the impact point based on the characteristics of the vibration load. The buffer structure includes a shell and a filling lattice. The buffer structure design module is also used to comprehensively consider vibration absorption and thermal conductivity in the design of lattice structures, wherein the lattice structure design includes: The heat source, boundary thermal conditions, material thermal conductivity, and heat transfer coefficient of the hydraulic flow channel structure are analyzed, and a simplified cell finite element model considering vibration absorption and heat conduction conditions is established. Topology optimization of lattice cells; Based on the friction distribution law of the flow channel surface of the hydraulic flow channel structure, a vibration-absorbing and heat-conducting array is selectively arranged between the inner and outer walls; The structure is thickened in areas with high friction on the inner wall, and more vibration-absorbing and heat-conducting arrays are designed. In areas where the friction on the inner wall is uniform or low, vibration absorption or stiffness-optimal matrix methods are used. The buffer structure design module is also used to combine the shell and the lattice model into the overall hydraulic flow channel structure after the shell thickness and lattice model of the hydraulic flow channel structure are determined, and to perform finite element simulation on the overall hydraulic flow channel structure model. Based on the results of finite element simulation, the shell and lattice structure design of the hydraulic flow channel structure were optimized and iterated to ensure that the buffering and vibration absorption performance met the design requirements. The finite element simulation of the overall structure model of the hydraulic flow channel includes: performing finite element simulation using AI replacement model and voxel method; The AI ​​substitution model is to use artificial intelligence algorithms to make equivalent substitutions of the attribute parameters of the lattice structure, making the lattice structure equivalent to a continuum, and then performing finite element simulation based on the continuum. The voxel method is a voxel-based 3D modeling method that divides the hydraulic flow channel structure into multiple cubes and constructs a 3D model based on the position and color information of the cubes.

6. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method described in any one of claims 1-4.

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