Method and device for optimizing hydraulic runner structure of dock folding mechanism and computer equipment

Abstract

The invention discloses a dock folding mechanism hydraulic flow channel structure optimization method and device and computer equipment. The dock folding mechanism hydraulic flow channel structure optimization method comprises the steps that optimization design is conducted on the shape of a hydraulic flow channel structure; performing three-dimensional flow field simulation analysis by adopting a fluid simulation module, and calculating a total pressure loss coefficient and wall surface pressure intensity; the curve transition design is further optimized; importing the further optimized hydraulic runner structure into a structure analysis module, performing response simulation analysis, and extracting the acceleration of a response point; obtaining an acceleration frequency response curve of the hydraulic flow channel structure according to the response point acceleration and the frequency response function extracted in the response simulation analysis; a buffer structure is designed at an impact generation position according to vibration load characteristics. On the basis of fluid simulation analysis, structural harmonic response analysis, finite element simulation, CFD topological optimization and the like, in combination with simulation analysis and based on an additive manufacturing technology, hydraulic impact is reduced by optimizing the shape of a flow channel in a shell and filling a specially-designed lattice structure, and buffering and vibration absorbing design is achieved.

Description

Technical Field

[0001] The invention relates to the field of computer-aided and simulation design, and in particular to a method, a device and a computer device for optimizing the hydraulic pipeline structure of a dock folding device. Background Art

[0002] With the development of shipbuilding and marine engineering technology, shipbuilding equipment has also been well developed. The dock folding mechanism has become an important facility for the manufacture, maintenance and repair of marine engineering equipment such as ships in the dock. However, as a key subsystem of the dock folding mechanism, the hydraulic system's hydraulic flow channel is subjected to high pressure and various load vibrations, which affects its life. In particular, locations where the fluid flow is not smooth, such as sudden changes in aperture and bends, will cause strong hydraulic excitation. These impacts not only cause forced vibrations in the flow channel housing, but also in the supporting structure. It seriously affects the performance and life of various key components in the actuator and hydraulic system, increases the failure rate of the system, and reduces the reliability and stability of the hydraulic system. Summary of the invention

[0003] In view of the above defects or improvement needs of the prior art, the present invention provides a method, device and computer equipment for optimizing the hydraulic flow channel structure of a dock folding mechanism. Based on fluid simulation analysis and structural harmonic response analysis, "AI substitution model" and "voxel method" are used for finite element simulation, CFD topology optimization, etc., combined with theoretical simulation, simulation analysis and experiments, based on additive manufacturing technology, the internal flow channel shape of the shell is optimized and a specially designed lattice structure is filled to reduce hydraulic shock, thereby realizing a buffering and vibration absorption design.

[0004] To achieve the above purpose, the present invention adopts the following technical solution.

[0005] In some embodiments, a method for optimizing the hydraulic channel structure of a dock folding mechanism is provided, wherein the hydraulic channel structure is based on additive manufacturing technology, and the method comprises:

[0006] Optimizing the shape of the hydraulic flow channel structure, wherein the optimization design includes replacing the flow channel of the drilling process with a curve transition design;

[0007] Use the 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 curve transition design according to the total pressure loss coefficient and the wall pressure;

[0009] The further optimized hydraulic channel structure is imported into the structural analysis module to perform response simulation analysis and extract the acceleration of the response point;

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

[0011] A buffer structure is designed at the impact location according to the vibration load characteristics, wherein the vibration load characteristics include an acceleration frequency response curve.

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

[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 by the type, geometric parameters and distribution density of the lattice unit cells, and combining the natural frequency of the lattice with the natural frequency of the hydraulic channel structure so that the natural frequency of the overall structure of the hydraulic channel differs from the vibration frequency generated by the liquid flow by more than a preset threshold.

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

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

[0016] According to the results of finite element simulation, the shell and lattice design of the hydraulic flow channel structure are reversely optimized and iteratively designed to ensure that the cushioning and vibration reduction performance meet the design requirements.

[0017] In some embodiments, the finite element simulation of the overall structural model of the hydraulic flow channel includes: using an AI replacement model and a voxel method to implement finite element simulation;

[0018] The AI ​​substitution model is to perform equivalent substitution of attribute parameters of the lattice structure through an artificial intelligence algorithm, to make the lattice structure equivalent to a continuum, and to perform finite element simulation on the basis of the continuum;

[0019] The voxel method is a voxel-based three-dimensional modeling method, which divides the hydraulic channel structure into a plurality of 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 vibration absorption and thermal conductivity to design a lattice structure, wherein the lattice structure design includes:

[0021] Analyze the heat source, boundary heat conditions, material thermal conductivity and heat transfer coefficient of the hydraulic flow channel structure, and establish a simplified cell finite element model that takes into account vibration absorption and heat conduction conditions;

[0022] Topological optimization of lattice cells;

[0023] According to the friction force distribution law of the flow channel surface of the hydraulic flow channel structure, a vibration absorbing and hot spot array is selectively arranged between the inner wall and the outer wall.

[0024] In some embodiments, the selective arrangement of a vibration absorbing and hot spot guiding array between the inner wall and the outer wall according to the friction distribution law of the flow channel surface of the hydraulic flow channel structure includes:

[0025] The structure is thickened in the area with greater friction on the inner wall, and more vibration-absorbing and heat-guiding arrays are designed;

[0026] In areas where the friction force on the inner wall is uniform or small, vibration absorption or stiffness optimum arrays are used.

[0027] In some embodiments, the method further includes, according to the temperature field distribution result of CFD, adding a heat dissipation structure, wherein the heat dissipation structure is one or more of an external heat sink, an external heat dissipation matrix, and an internal circulation cooling system.

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

[0029] A shape design module for a hydraulic flow channel structure, used for optimizing the shape of the hydraulic flow channel structure, wherein the optimization design includes replacing the flow channel of the drilling process with a curve transition design;

[0030] Fluid simulation module, used to perform three-dimensional flow field simulation analysis and calculate the total pressure loss coefficient and wall pressure;

[0031] An optimization design module for the hydraulic channel structure, used to further optimize the curve transition design according to the total pressure loss coefficient and the wall pressure;

[0032] The structural analysis module is used to import the further optimized hydraulic flow channel structure into the structural analysis module, perform response simulation analysis, and extract the acceleration of the response point;

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

[0034] The buffer structure design module is used to design the buffer structure at the impact location according to the vibration load characteristics.

[0035] Some embodiments of the present application further provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any of the above-described methods when executing the program.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows: in the embodiments 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, structural harmonic response analysis, and adopts "AI substitution model" and "voxel method" for finite element simulation, CFD topology optimization, etc., to optimize the internal flow channel shape of the shell and fill the specially designed lattice structure to reduce hydraulic shock, realize the buffering and 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 THE DRAWINGS

[0037] Figure 1 The present invention is a schematic diagram of the overall process of a method for optimizing the hydraulic channel structure of a dock folding mechanism according to an embodiment of the present invention.

[0038] Figure 2 It is a schematic diagram comparing a part of the optimized hydraulic channel structure of one embodiment of the present invention with a traditional solution.

[0039] Figure 3 A schematic diagram of a three-dimensional flow field simulation analysis comparing an optimized pipeline according to an embodiment of the present invention with a traditional pipeline.

[0040] Figure 4 This is a diagram showing the internal flow field distribution of a hydraulic flow channel structure housing using an optimized pipeline in comparison with a traditional pipeline according to an embodiment of the present invention.

[0041] Figure 5 This is a diagram showing the internal streamline distribution of a hydraulic flow channel structure housing using an optimized pipeline in comparison with a traditional pipeline according to an embodiment of the present invention.

[0042] Figure 6 FIG. 1 is a force curve diagram comparing a hydraulic flow channel structure according to an embodiment of the present invention with a traditional pipeline.

[0043] Figure 7 A vibration acceleration spectrum diagram comparing a hydraulic flow channel structure according to an embodiment of the present invention with a traditional pipeline.

[0044] Figure 8 The vibration frequency response curve of the hydraulic channel structure according to one embodiment of the present invention compared with the traditional pipeline.

[0045] Fig. 9 It is a schematic diagram of shell extraction and filling of dot matrix at the impact part of the hydraulic flow channel structure according to one embodiment of the present invention.

[0046] Fig.10 It is a schematic diagram of converting a dot matrix into a continuum using an AI substitution model according to an embodiment of the present invention.

[0047] Fig.11 Schematic diagram of CFD topology optimization of flow channel according to an embodiment of the present invention.

[0048] Fig.12 It is a schematic diagram of a hydraulic flow channel structure optimization device of a dock folding mechanism according to an embodiment of the present invention.

[0049] Fig.13 A schematic diagram of an electronic device according to an embodiment of the present invention.

[0050] Fig.14 The figure is a schematic structural diagram of the hydraulic system of the dock folding mechanism according to one embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0053] In some embodiments of the present application, the hydraulic system of the dock folding mechanism is composed as follows: Fig.14As shown in the figure, its structural vibration is mainly caused by pressure pulsation (during normal operation) and pressure mutation (start, stop and reversing). The pulsating flow acts on the flow channel inside the hydraulic flow channel structure shell to generate pressure pulsation. The pressure pulsation not only causes the flow channel to have periodic forced vibration, but also causes the shell support structure to have periodic forced vibration, causing micro-wear on the support structure surface, and the support stiffness gradually decreases, thereby reducing the structural natural frequency until it is close to or coincides with the pressure pulsation frequency, which will cause fluid-solid coupling vibration, affecting the performance and service life of the entire hydraulic system. When the hydraulic system is instantaneously started, shut down, changed speed or reversed, that is, when the control valve port is closed or the actuator stops suddenly, due to the inertia of the flowing liquid and moving parts, the mechanical energy of the flowing liquid and moving parts is instantly converted into the pressure energy of the system, which will form a very high instantaneous peak pressure in the system, generating hydraulic shock, especially the locations where the aperture mutation, bends and other locations where the flow is not smooth will cause strong hydraulic excitation. These shocks not only cause forced vibration of the shell, but also cause forced vibration of the shell support structure. It seriously affects the performance and life of various key components in the actuator and hydraulic system, increases the failure rate of the system, and reduces the reliability and stability of the system. The consequences are more serious especially in the high-pressure, high-speed and large-flow systems.

[0054] In an embodiment of the present application, the hydraulic flow channel structure of the dock folding mechanism is based on additive manufacturing technology. It optimizes the internal flow channel shape of the shell and fills a specially designed lattice structure to reduce hydraulic shock, thereby realizing a buffering and vibration absorption design of the hydraulic flow channel structure of the dock folding mechanism and reducing vibration noise caused by pressure pulsation and pressure mutation.

[0055] Figure 1 The overall flow diagram of the method for optimizing the hydraulic flow channel structure of the dock folding mechanism according to one embodiment of the present invention is shown in FIG. Figure 1 As shown, in some embodiments, a method for optimizing the hydraulic flow channel structure of a dock folding mechanism is provided, wherein the hydraulic flow channel structure is based on additive manufacturing technology, and the method comprises:

[0056] Optimizing the shape of the hydraulic flow channel structure, wherein the optimization design includes replacing the flow channel of the drilling process with a curve transition design;

[0057] Use the fluid simulation module to perform three-dimensional flow field simulation analysis and calculate the total pressure loss coefficient and wall pressure;

[0058] Further optimizing the curve transition design according to the total pressure loss coefficient and the wall pressure;

[0059] The further optimized hydraulic channel structure is imported into the structural analysis module to perform response simulation analysis and extract the acceleration of the response point;

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

[0061] A buffer structure is designed at the impact location according to the vibration load characteristics, wherein the vibration load characteristics include an acceleration frequency response curve.

[0062] Figure 2 This is a schematic diagram of a partial comparison of the optimized hydraulic flow channel structure of an embodiment of the present invention (with the traditional solution). Figure 2 The traditional hydraulic flow channel structure shell is mainly formed by drilling holes on the blank to form the flow channel structure. For the processing of complex flow channels, it is often necessary to drill additional process holes. It is difficult to remove burrs at the intersection of the channels. Due to the existence of chamfered holes and eccentricity of the inlet and outlet flow channels, the hydraulic oil remains in the tool tip cavity and corners (such as Figure 2 In the embodiment of the present application, the flow channel is optimized to form a vortex through the flow channel after the curve is fully transitioned (as shown in FIG. Figure 2 (b) can effectively reduce the oil vortex and impact caused by the process cavity, and reduce the pressure loss and vibration when the oil flows through. In the embodiment of the present application, the hydraulic flow channel structure is based on additive manufacturing technology, which overcomes the problem that it is difficult to achieve processing by traditional machining or casting, making it possible to use a curved transition design to replace the flow channel of the drilling process.

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

[0064] Figure 3 For traditional pipelines (such as Figure 3 (a)) and the optimized pipeline (as shown in Figure 3 Schematic diagram of three-dimensional flow field simulation analysis (shown in (b)). The calculation results show that the optimized flow channel has a 27% lower pressure loss and a 30% lower impact force than the traditional machined flow channel.

[0065] Figure 4 The flow field distribution diagram inside the shell of the hydraulic flow channel structure using traditional pipelines (such as Figure 4(a)) and the flow field distribution diagram inside the hydraulic flow channel structure shell with optimized pipeline (as shown in Figure 4 (as shown in (b)). Figure 5 The internal streamline distribution diagram of the hydraulic flow channel structure shell using traditional pipelines (such as Figure 5 (a)) and the internal streamline distribution diagram of the hydraulic flow channel structure shell with optimized pipeline (as shown in Figure 5 As shown in (b)). The calculation results show that the total pressure loss of the optimized hydraulic flow channel structure shell is reduced by 35.4% compared with the traditional structure.

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

[0067] The optimized hydraulic channel structure is imported into the structural analysis module for response simulation analysis and extraction of response point acceleration. Specifically, the above fluid calculation results are imported into the structural analysis module for harmonic response analysis, including first-order modal analysis and harmonic response analysis at 100 Hz, and the vibration acceleration spectrum is obtained (such as Figure 7 shown).

[0068] According to the definition of frequency response function, for any test point, its acceleration frequency response can be expressed as: the logarithm of the ratio of vibration acceleration to reference acceleration with base 10 multiplied by 20, recorded as VAL, in decibels (dB). According to the definition, it can be expressed as:

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

[0070] The acceleration and excitation force of the response point extracted from the simulation can be substituted into the calculation through the above formula to obtain the acceleration frequency response curve of the structure, such as Figure 8 As shown in the figure, after the pipeline is optimized, the vibration sound pressure level is reduced from 92dB to 85dB, a reduction of about 7%.

[0071] like Fig. 9 As shown, in some embodiments, a buffer structure is designed at the impact location according to the vibration load characteristics, the vibration load characteristics include an acceleration frequency response curve, and the buffer structure includes a shell extraction and a filling lattice. According to the acceleration frequency response curve, if the acceleration frequency response exceeds a threshold, a buffer structure can be designed at the impact location in combination with the wall pressure. In the embodiments of the present application, a personalized buffer structure is designed at the impact location according to the characteristics of the vibration load, and the local stiffness is reduced and the impact is reduced by shell extraction and filling lattices. Fig. 9 As shown, (a) is a schematic diagram of a solid cross-section, (b) is a partial enlarged diagram, and (c) is a schematic diagram of a partial shell extraction and filling dot matrix processing. Specifically, a buffer structure can be designed for the place where the flow channel direction changes or the place where the flow channel cross-sectional area changes. In some embodiments, the buffering performance data of the dot matrix can be determined by experiments. The dot matrix specimen is printed using a selected metal material on an impact testing machine. The dot matrix is ​​placed on the experimental platform, the height of the drop hammer is set, and the dot matrix is ​​impacted by free fall. The deformation of the dot matrix is ​​detected by DIC (digital image correlation technology) speckle strain measurement. The elastic deformation energy of the dot matrix is ​​calculated based on the detection results, thereby evaluating the buffering performance of the dot matrix.

[0072] 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 by the type, geometric parameters and distribution density of the lattice unit cells, and combining the natural frequency of the lattice with the natural frequency of the hydraulic channel structure so that the natural frequency of the overall structure of the hydraulic channel differs from the vibration frequency generated by the liquid flow by more than a preset threshold.

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

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

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

[0076] (3) Using a vibrating hammer to hit the hydraulic flow channel structure test piece, and using a vibration-pickup accelerometer to detect the vibration signal;

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

[0078] The natural 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. The resonance formula can be used to describe its vibration state:

[0079]

[0080] Among them, 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 measured by a uniaxial tensile test of the lattice tensile specimen. The tensile test detects the deformation amount and the increment of the tensile force in the elastic deformation stage, and the elastic modulus, that is, the stiffness of the lattice, is obtained by dividing the two.

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

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

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

[0084] According to the results of finite element simulation, the shell and lattice design of the hydraulic flow channel structure are reversely optimized and iteratively designed to ensure that the cushioning and vibration reduction performance meet the design requirements.

[0085] In some embodiments, the finite element simulation of the overall structural model of the hydraulic flow channel includes: using an AI replacement model and a voxel method to implement finite element simulation;

[0086] The AI ​​substitution model is to perform equivalent substitution of attribute parameters of the lattice structure through an artificial intelligence algorithm, to make the lattice structure equivalent to a continuum, and to perform finite element simulation on the basis of the continuum;

[0087] The voxel method is a voxel-based three-dimensional modeling method, which divides the hydraulic 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 and lattice model of the hydraulic channel structure are determined, the shell and lattice model are combined into the overall structure of the hydraulic channel, and the model is subjected to finite element simulation. The finite element simulation with the lattice model has the problems of large finite element quantity and long calculation time. In the embodiment of the present application, the "AI replacement model" and "voxel method" schemes are used to implement the simulation.

[0089] The “AI substitution model” is to use artificial intelligence algorithms to replace the attribute parameters of the lattice structure, making it equivalent to a continuum (such as Fig.10 As shown), and finite element simulation is performed on the continuum basis, thereby greatly reducing the amount of calculation; the "voxel method" is a three-dimensional modeling method based on voxels. The voxel method divides the hydraulic flow channel structure into small cubes, and then constructs a three-dimensional model based on the position and color information of these cubes. This method is faster than the finite element method.

[0090] According to the simulation results, the shell and lattice design of the hydraulic flow channel structure are reversely optimized and iterated to ensure that its buffering and vibration reduction performance meet the design requirements. After the numerical simulation results meet the requirements, special experiments are carried out to verify the buffering and vibration absorption performance.

[0091] In the special verification experiment, the printed hydraulic flow channel structure entity parts are configured with water environment and connected with pipeline interfaces according to the actual environmental water pressure and internal hydraulic working conditions. The valves are opened and closed according to the frequency of use, and the impact and vibration amplitude of the hydraulic flow channel structure entity parts under actual working conditions are detected by accelerometers and other equipment, and the local deformation of the entity parts is detected by DIC speckle strain gauges. Data is collected and compared with the expected design values.

[0092] In the embodiments of the present application, additive manufacturing is used as a processing method for the hydraulic flow channel structure, which allows more novel structures to be applied. Since the high-speed flowing hydraulic oil will rub against the inner surface of the wall, the hydraulic flow channel structure also needs to consider the heat dissipation problem. By designing the hydraulic flow channel structure to contain a lattice structure inside, it can have more excellent performance in noise reduction and sound absorption. However, the hollow lattice 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 includes one or more of the flow channel design, the tube wall lattice structure design, and the heat dissipation structure design.

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

[0095] Specifically, in some embodiments, the heat source is firstly considered. The main reason for the heating of the hydraulic channel structure is the friction between the fluid and the inner wall. In some embodiments of the present application, the channel is optimized during the design process. According to the control requirements of the hydraulic system, the inlet and outlet of the channel are designed, and then the minimum flow loss is taken as the optimization goal within the design domain, such as Fig.11 As shown, the CFD (Computational Fluid Dynamics) topology optimization method is used to optimize the flow channel design, remove backflow and reduce flow losses. The CFD topology optimization method first creates a design space, in which the software algorithm automatically optimizes, gradually removes excess space volume, and finds the best flow channel shape. Specifically, computer software can be used to perform topological optimization on the flow channel. The optimization targets are fluid-related variables (such as flow resistance, efficiency, heat transfer coefficient, etc.), based on the optimization of parameters such as free shape, dimensional parameters, physical properties, and boundary conditions. Finally, a flow channel layout scheme with uniform fluid velocity, minimum total friction work of the pipe wall or minimum maximum friction is designed to reduce frictional heating of high-pressure oil.

[0096] In some embodiments, optimizing the hydraulic channel structure includes designing a tube wall lattice structure.

[0097] Specifically, in some embodiments, the method further includes: comprehensively considering vibration absorption and thermal conductivity to design a lattice structure, wherein the lattice structure design includes:

[0098] Analyze the heat source, boundary heat conditions, material thermal conductivity and heat transfer coefficient of the hydraulic flow channel structure, and establish a simplified cell finite element model that takes into account vibration absorption and heat conduction conditions;

[0099] Topological optimization of lattice cells;

[0100] According to the friction force distribution law on the flow channel surface of the hydraulic flow channel structure, a vibration absorbing and hot spot guiding array is selectively arranged between the inner wall and the outer wall.

[0101] When considering vibration absorption and noise reduction, the hydraulic channel structure is designed to have inner and outer walls of a certain thickness, and the inner and outer walls are connected in a lattice structure. Although the existence of the lattice gap can greatly improve the vibration absorption effect, the bubbles in the gap will hinder the heat conduction process. In the embodiment of the present application, the lattice structure is designed by comprehensively considering the vibration absorption and heat conduction performance.

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

[0103] Afterwards, the lattice cell is topologically optimized. With a constant porosity as a constraint and maximizing thermal conductivity as the optimization goal, a finite element model of load, vibration absorption and heat transfer of a single cell is established using periodic symmetric boundary conditions. The single cell is topologically optimized to find the cell with the best vibration absorption and heat conduction effects. After the model is determined, the lattice test block is printed with the selected material, and a special verification of the vibration absorption and heat dissipation performance is carried out. By comparing the numerical simulation and experimental results, the vibration and thermal models input by the numerical simulation are corrected according to the experimental results, and a relationship equation that truly reflects the vibration reduction and heat dissipation performance of the structure is established. Based on the measured results, a model design and processing method for optimizing the vibration absorption and heat dissipation functions of the lattice are proposed, the configuration of the structural parts with an ideal lattice configuration is determined, and a parametric model of the cell is established.

[0104] In some embodiments, the selective arrangement of a vibration absorbing and hot spot guiding array between the inner wall and the outer wall according to the friction distribution law of the flow channel surface of the hydraulic flow channel structure includes:

[0105] The structure is thickened in the area with greater friction on the inner wall, and more vibration-absorbing and heat-guiding arrays are designed;

[0106] In areas where the friction force on the inner wall is uniform or small, vibration absorption or stiffness optimum arrays are used.

[0107] In the embodiments of the present application, after establishing a rough overall structure of the hydraulic flow channel according to the flow channel structure, a vibration absorbing hot spot array is selectively arranged between the inner wall and the outer wall according to the distribution law of friction on the flow channel surface. The structure is thickened in the area where the inner wall friction is large, and more vibration absorbing hot spot arrays are designed. In the area where the inner wall friction is uniform or small, a vibration absorbing or stiffness optimum point array is used. Through the field-driven design method, the lattice structure is realized in which different lattices are used in different areas, and the gradient transition effect between the areas is achieved.

[0108] In some embodiments, optimizing the hydraulic 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, wherein the heat dissipation structure is one or more of an external heat sink, an external heat dissipation matrix, and an internal circulation cooling system.

[0110] In some embodiments, heat sinks can be added to the outside of the high-temperature area according to the temperature field distribution results of CFD. Specifically, based on the temperature gradient, the optimal heat sink shape on the plane and cylindrical surface is designed by using the topology optimization method, so that the heat from the high-temperature area can be guided to the low-temperature area, and the contact area with the seawater can be increased by using the heat sink to further improve the heat dissipation effect.

[0111] In some embodiments, in addition to improving the heat dissipation performance through heat sinks, a lattice structure can be used on the outer wall to improve heat dissipation. According to the temperature field obtained by CFD, the TPMS (Triply Periodic Minimal Surface) heat dissipation lattice on the outer surface is designed. It has a novel architecture, interconnected and wind-inter-porous topological structure and a high surface area to volume ratio. The cell structure based on TPMS can enhance the heat exchange mechanism and maximize the heat dissipation area.

[0112] In some embodiments, additive manufacturing can design highly complex product structures. In the hydraulic flow channel structure, a cooling circuit can be designed along the flow channel surface to further improve the heat dissipation effect. The cooling circuit is designed according to the temperature field of the flow channel CFD, the heat from the local heating position is transported 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 added, and seawater can be introduced into the cooling circuit and discharged after the heating area of ​​the hydraulic flow channel structure is heated.

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

[0114] A shape design module for a hydraulic flow channel structure, used for optimizing the shape of the hydraulic flow channel structure, wherein the optimization design includes replacing the flow channel of the drilling process with a curve transition design;

[0115] Fluid simulation module, used to perform three-dimensional flow field simulation analysis and calculate the total pressure loss coefficient and wall pressure;

[0116] An optimization design module for the hydraulic channel structure, used to further optimize the curve transition design according to the total pressure loss coefficient and the wall pressure;

[0117] The structural analysis module is used to import the further optimized hydraulic flow channel structure into the structural analysis module, perform response simulation analysis, and extract the acceleration of the response point;

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

[0119] The buffer structure design module is used to design the buffer structure at the impact location according to the vibration load characteristics.

[0120] Some embodiments of the present application further provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any of the above-described methods when executing the program.

[0121] refer to Fig.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 when the processor executes the program, the numerical simulation, analysis, or control step in any of the above-described methods is implemented.

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

[0123] The above method can be implemented by a controller in any appropriate manner. For example, the controller can take the form of a microprocessor or processor and a computer-readable medium storing a computer-readable program code (such as software or firmware) that can be executed by the (micro)processor, a logic gate, a switch, an application-specific integrated circuit (ASIC), a programmable logic controller, and an embedded microcontroller. Examples of controllers include but are not limited to microcontrollers. The memory controller can also be implemented as part of the control logic of the memory. It is understandable that in addition to implementing the controller in a purely computer-readable program code manner, the controller can be implemented in the form of a logic gate, a switch, an application-specific integrated circuit, a programmable logic controller, and an embedded microcontroller by logically programming the method steps. Therefore, this controller can be considered as a hardware component, and the devices included therein for implementing various functions can also be regarded as structures within the hardware component. Or even, the devices for implementing various functions can be regarded as both software modules for implementing the method and structures within the hardware component.

[0124] The systems, devices, modules or units in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may 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 by dividing it into various modules according to its functions. Of course, when implementing this specification, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0126] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, this specification may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0127] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present specification. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0128] In some embodiments, a computer-readable storage medium is further provided, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, any of the above-described methods is implemented.

[0129] In some embodiments, these computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0130] In some embodiments, these computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

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

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

[0133] In some embodiments, computer-readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, modules of programs 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, read-only compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device.

[0134] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for optimizing the hydraulic flow channel structure of a dock folding mechanism, characterized in that: The hydraulic channel structure is based on additive manufacturing technology, and the method includes: Optimizing the shape of the hydraulic flow channel structure, wherein the optimization design includes replacing the flow channel of the drilling process with a curve transition design; Use the fluid simulation module to perform three-dimensional flow field simulation analysis and calculate the total pressure loss coefficient and wall pressure; Further optimizing the curve transition design according to the total pressure loss coefficient and the wall pressure; The further optimized hydraulic channel structure is imported into the structural analysis module to perform response simulation analysis and extract the acceleration of the response point; According to the acceleration and frequency response function of the response point extracted from the response simulation analysis, the acceleration frequency response curve of the hydraulic flow channel structure is obtained; A buffer structure is designed at the impact location according to the vibration load characteristics, wherein the vibration load characteristics include an acceleration frequency response curve.

2. The method for optimizing the hydraulic channel structure according to claim 1, characterized in that: The buffer structure includes a shell and a filling matrix.

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

4. The method for optimizing the hydraulic channel structure according to claim 3, characterized in that: The method further comprises: After the shell thickness and lattice model of the hydraulic flow channel structure are determined, the shell and the lattice model are combined into the overall structure of the hydraulic flow channel, and the finite element simulation is performed on the overall structure model of the hydraulic flow channel; According to the results of finite element simulation, the shell and lattice design of the hydraulic flow channel structure are reversely optimized and iteratively designed to ensure that the cushioning and vibration reduction performance meet the design requirements.

5. The method for optimizing the hydraulic channel structure according to claim 4, characterized in that: The finite element simulation of the overall structural model of the hydraulic flow channel includes: using an AI replacement model and a voxel method to implement finite element simulation; The AI ​​substitution model is to perform equivalent substitution of attribute parameters of the lattice structure through an artificial intelligence algorithm, to make the lattice structure equivalent to a continuum, and to perform finite element simulation on the basis of the continuum; The voxel method is a voxel-based three-dimensional modeling method, which divides the hydraulic channel structure into a plurality of cubes, and then constructs a three-dimensional model according to the position and color information of the cubes.

6. The method for optimizing the hydraulic channel structure according to claim 5, characterized in that: The method further includes: comprehensively considering vibration absorption and thermal conductivity to design a lattice structure, wherein the lattice structure design includes: Analyze the heat source, boundary heat conditions, material thermal conductivity and heat transfer coefficient of the hydraulic flow channel structure, and establish a simplified cell finite element model that takes into account vibration absorption and heat conduction conditions; Topological optimization of lattice cells; According to the friction force distribution law of the flow channel surface of the hydraulic flow channel structure, a vibration absorbing and hot spot array is selectively arranged between the inner wall and the outer wall.

7. The method for optimizing the hydraulic channel structure according to claim 6, characterized in that: The method of selectively arranging a vibration absorbing and hot spot guiding array between the inner wall and the outer wall according to the friction force distribution law of the flow channel surface of the hydraulic flow channel structure includes: The structure is thickened in the area with greater friction on the inner wall, and more vibration-absorbing and heat-guiding arrays are designed; In areas where the friction force on the inner wall is uniform or small, vibration absorption or stiffness optimum arrays are used.

8. The method for optimizing the hydraulic channel structure according to claim 7, characterized in that: The method further includes, according to the temperature field distribution result of CFD, adding a heat dissipation structure, wherein the heat dissipation structure is one or more of an external heat sink, an external heat dissipation matrix, and an internal circulation cooling system.

9. A device for optimizing the hydraulic flow channel structure of a dock folding mechanism, characterized in that: The hydraulic channel structure is based on additive manufacturing technology, and the device includes: A shape design module for a hydraulic flow channel structure, used for optimizing the shape of the hydraulic flow channel structure, wherein the optimization design includes replacing the flow channel of the drilling process with a curve transition design; Fluid simulation module, used to perform three-dimensional flow field simulation analysis and calculate the total pressure loss coefficient and wall pressure; An optimization design module for the hydraulic channel structure, used to further optimize the curve transition design according to the total pressure loss coefficient and the wall pressure; The structural analysis module is used to import the further optimized hydraulic flow channel structure into the structural analysis module, perform response simulation analysis, and extract the acceleration of the response point; A frequency response curve acquisition module is used to obtain the acceleration frequency response curve of the hydraulic flow channel structure according to the response point acceleration and frequency response function extracted in the response simulation analysis; The buffer structure design module is used to design the buffer structure at the impact location according to the vibration load characteristics.

10. 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, the steps of the method according to any one of claims 1 to 8 are implemented.

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