CN115688510B - Pump hydraulic power and structure collaborative optimization design system and method based on digital twinning - Google Patents
Pump hydraulic power and structure collaborative optimization design system and method based on digital twinning Download PDFInfo
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- CN115688510B CN115688510B CN202211227420.4A CN202211227420A CN115688510B CN 115688510 B CN115688510 B CN 115688510B CN 202211227420 A CN202211227420 A CN 202211227420A CN 115688510 B CN115688510 B CN 115688510B
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Abstract
The invention relates to a system and a method for designing a hydraulic and structural collaborative optimization based on a digital twin pump. The system comprises: the system comprises a fluid calculation model establishing module, a structure calculation model establishing module, a rotor system calculation model establishing module, a test establishing module, a machine algorithm establishing module and a correlation analysis establishing module; the invention comprises the following steps: and establishing an accurate digital twin model which comprises a fluid calculation model, a structure calculation model, a rotor system calculation model and a test platform, realizing the bidirectional interaction of the entity pump and the virtual model, and driving the update and optimization of the digital twin model. On one hand, the change of the pump performance parameters can be dynamically displayed in the digital twin body in real time, and on the other hand, the digital twin body can perform intelligent analysis on the basis of the operation parameters, load and wear data, historical data, experience and knowledge data and the like transmitted by the entity pump, so that accurate intelligent decisions are provided for design optimization, operation optimization, fault diagnosis and prediction.
Description
Technical Field
The invention belongs to the technical field of pumps, and particularly relates to a system and a method for collaborative optimization design of hydraulic power and structure of a pump based on digital twinning.
Background
The water pump is one of the most main power consumption devices in the industrial field of China, has large consumption and wide related range, is widely applied to the fields of farmland irrigation and drainage, petrochemical industry, power industry, urban water supply and drainage and the like, and has the power consumption accounting for about 20 percent of the total generated energy. At present, the performance of pumps in China has a considerable gap compared with the performance of pumps in the world, and the research and the study on energy-saving ways and measures of water pumps improve the efficiency of the water pumps and the operating efficiency of pump systems thereof, prolong the operating life of the pumps, reduce energy consumption and have important significance for the energy-saving and emission-reducing work in China. Therefore, a large amount of research is carried out on the optimization design of the pump by scholars at home and abroad, but the research on the performance design optimization and the structural stability of the pump is often independent, the hydraulic design only aims at the operation efficiency of the water pump, the structural design focuses on the operation stability of the water pump, and the incomplete optimization design is caused by neglecting the internal association between the hydraulic design and the structural design; in addition, because the water pump has a complex structure, the numerical simulation of the pump power and the structural design emphasizes the use of a simplified model, and various loss leakage and real-time running states of the water pump are not considered. Therefore, pump designs should be developed in a more comprehensive and realistic direction.
Disclosure of Invention
In order to solve the problem that various loss leakage and real-time running states of a water pump are not considered in the existing model, the invention provides a system and a method for collaborative optimization design of hydraulic power and structure of the pump based on digital twinning.
In order to achieve the purpose, the invention provides the following scheme: pump water conservancy and structure collaborative optimization design system based on digit twin includes:
the calculation model establishing module is used for establishing a pump digital twin calculation model;
the test platform establishing module is used for establishing a pump digital twin test platform;
the digital twins model establishing module is used for establishing a digital twins model through the pump digital twins calculation model and the pump digital twins test platform;
the machine algorithm building module is used for building a machine algorithm model according to the digital twin model, and the machine algorithm model is used for calculating a multi-objective optimization result;
and the collaborative design model establishing module is used for establishing a collaborative design model according to the digital twin model and the multi-objective optimization result, and the collaborative design model is used for carrying out collaborative optimization on the pump hydraulic power and the structure.
Preferably, the calculation model building module comprises,
the fluid calculation model establishing module is used for establishing a pump digital twin fluid calculation model;
the structure calculation model establishing module is used for establishing a pump digital twinning structure calculation model according to the pump digital twinning fluid calculation model;
and the rotor system calculation model establishing module is used for establishing a pump digital twin rotor system calculation model according to the pump digital twin fluid calculation model and the pump digital twin structure calculation model.
Preferably, the fluid calculation model building module comprises:
the first geometric model building unit is used for building a first geometric model of the pump according to the geometric parameters of the physical entity of the pump;
the first grid division establishing unit is used for establishing a first grid division module, and the first grid division module is used for partitioning, determining the type of a grid unit and carrying out grid division on a computational domain;
the fluid numerical simulation obtaining unit is used for carrying out numerical simulation on the flow field in the pump according to the pump grid division result to obtain a fluid numerical simulation result;
and the fluid calculation model establishing module is used for establishing a pump digital twin fluid calculation model according to the fluid numerical simulation result.
Preferably, the structural calculation model building module includes:
the second geometric model establishing unit is used for importing the first geometric model according to the fluid calculation model and establishing a second geometric model of the pump;
the second grid division establishing unit is used for importing the grid division of the component to be analyzed according to the first grid division module;
the structure numerical simulation obtaining unit is used for carrying out structure simulation calculation according to grid division to obtain structure data;
and the structure calculation model establishing unit is used for establishing a pump digital twin structure calculation model according to the structure data.
Preferably, the rotor system calculation model establishing module specifically includes:
the rotor system establishing unit is used for establishing a three-dimensional model of the rotor system according to the geometric parameters of the pump rotor system;
the material attribute establishing unit is used for adding materials according to the size of the model and setting the unit of the material attribute to establish the material attribute;
the grid division establishing unit is used for selecting a unit of the rotor system model and dividing grids according to the grid division software;
the natural frequency calculation establishing unit is used for calculating the natural frequency of the rotor system according to the structure of fluid-solid coupling calculation;
the static analysis establishing unit is used for carrying out static analysis on the rotor component through finite element software;
a critical rotation speed establishing unit for calculating a critical rotation speed by a discrete method of the rotor part;
and the rotor system calculation model establishing unit is used for establishing a pump digital twin rotor system calculation model according to the pump digital twin fluid calculation model and the pump digital twin structure calculation model by combining the rotor system three-dimensional model, grid division, natural frequency, static force analysis and critical rotating speed.
Preferably, the test platform establishing module includes:
the test platform building unit is used for building a pump-open type test platform;
the data acquisition platform building unit is used for compiling a graphical language program based on software and building a data acquisition platform;
and the test platform establishing unit is used for establishing a pump digital twin test platform according to the test platform and the data acquisition platform.
The application also provides a hydraulic and structural collaborative optimization design method based on the digital twin, which comprises the following steps:
constructing a pump digital twin fluid calculation model;
constructing a pump digital twin structure calculation model according to the pump digital twin fluid calculation model;
constructing a pump digital twin rotor system calculation model according to the pump digital twin fluid calculation model and the pump digital twin structure calculation model;
establishing a pump digital twinborn test platform;
constructing a digital twinborn model through the pump digital twinborn calculation model and the pump digital twinborn test platform;
constructing a machine algorithm model according to the digital twin model, wherein the machine algorithm model is used for calculating a multi-objective optimization result;
and constructing a collaborative design model according to the digital twin model and the multi-objective optimization result, wherein the collaborative design model is used for collaborative optimization of the hydraulic power and the structure of the pump.
Preferably, the method of establishing a pump digital twin fluid calculation model comprises:
establishing a first geometric model of the pump according to the geometric parameters of the physical entity of the pump;
establishing a first grid division module, wherein the first grid division module is used for partition processing, determining the type of a grid unit and carrying out grid division on a calculation domain;
according to the pump mesh division result, carrying out numerical simulation on a flow field in the pump to obtain a fluid numerical simulation result;
and establishing a pump digital twin fluid calculation model according to the fluid numerical simulation result.
Preferably, the method of establishing the pump digital twin structure calculation model comprises:
importing the first geometric model according to the fluid calculation model, and establishing a second geometric model of the pump;
importing the mesh division of the component to be analyzed according to a first mesh division module;
carrying out structural simulation calculation according to grid division to obtain structural data;
and establishing a pump digital twin structure calculation model according to the structure data.
Preferably, the method of establishing a pump digital twin rotor system calculation model comprises:
establishing a three-dimensional model of the rotor system according to the geometric parameters of the pump rotor system;
adding materials according to the size of the model and setting units of material attributes to establish the material attributes;
selecting a unit of a rotor system model and dividing grids according to grid division software;
calculating the natural frequency of the rotor system according to the structure of fluid-solid coupling calculation;
performing static analysis on the rotor component through finite element software;
calculating the critical rotating speed by a discrete method of the rotor part;
and establishing a pump digital twin rotor system calculation model according to the pump digital twin fluid calculation model and the pump digital twin structure calculation model by combining the rotor system three-dimensional model, grid division, natural frequency, static force analysis and critical rotation speed.
Preferably, establishing a pump digital twin test calculation model comprises:
building a pump open type test platform;
compiling a graphical language program for pump measurement based on software, and building a data acquisition platform;
and establishing a pump digital twin test acquisition platform according to the test platform and the data acquisition platform.
The invention discloses the following technical effects:
according to the method, a high-precision pump digital twin model is constructed through a digital twin technology, the internal relation between hydraulic power and a structural calculation model is fused, the behavior of the pump is simulated in real time, the performance parameters of the pump are accurately predicted, accurate data support is provided for analyzing the relation between the design variables of the pump and an optimization target, the optimization of a pump hydraulic model is realized, and the aims of high efficiency and high stability are achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a digital twinning-based hydraulic and structural collaborative optimization design system according to an embodiment of the invention;
FIG. 2 is a flow chart of a pump digital twin model construction according to an embodiment of the present invention;
FIG. 3 is a flow chart of a pump digital twin fluid calculation model construction according to an embodiment of the present invention;
FIG. 4 is a flow chart of a pump digital twin structure calculation model construction according to an embodiment of the present invention;
FIG. 5 is a flow chart of a pump digital twin rotor system calculation model construction according to an embodiment of the present invention;
FIG. 6 is a flow chart of a method for multi-objective pump optimization according to an embodiment of the present invention;
FIG. 7 is a flow chart of a method for pump power and structural co-design in accordance with an embodiment of the present invention;
FIG. 8 is a flow chart of a design method for hydraulic and structural co-optimization of a pump based on digital twinning according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
As shown in fig. 1, the present embodiment provides a digital twin-based pump hydraulic power and structure collaborative optimization design system, which includes:
the fluid calculation model establishing module is used for establishing a pump digital twin fluid calculation model;
the structure calculation model establishing module is used for establishing a pump digital twin structure calculation model according to the pump digital twin fluid calculation model;
the rotor system calculation model establishing module is used for establishing a pump digital twin rotor system calculation model according to the pump digital twin fluid calculation model and the pump digital twin structure calculation model;
the test establishing module is used for establishing a pump digital twin test platform;
the digital twinning model establishing module is used for determining a digital twinning model according to the pump digital twinning fluid calculation model, the pump digital twinning structure calculation model, the pump digital twinning rotor system calculation model and the pump digital twinning test testing platform;
the machine algorithm module is used for providing a high-precision mathematical model and a multi-objective optimization method according to the digital twin model and calculating a multi-objective optimization result;
and the correlation analysis module is used for revealing the influence rule of the multivariate correlation on the dynamic characteristics according to the digital twin model and the machine algorithm module and establishing a hydraulic and structural collaborative design method.
Further optimizing the scheme, the fluid calculation model building module specifically comprises:
the geometric model establishing unit is used for carrying out 3D modeling according to the geometric parameters of the physical entity of the pump and establishing a geometric model of the pump;
the mesh division establishing unit is used for carrying out partition processing according to a geometric model of the pump and a full flow channel complex structure of the pump, determining the type of mesh units to be adopted and carrying out mesh division on a calculation domain;
the fluid numerical simulation obtaining unit is used for carrying out numerical simulation on a flow field in the pump according to the options of pump grid division, boundary conditions, turbulence models, coupling modes of pressure and speed, discrete formats and the like, and obtaining a fluid numerical simulation result;
and the fluid calculation model establishing module is used for establishing a pump digital twin fluid calculation model according to the geometric model, the mesh division and the fluid numerical simulation.
Further optimizing the scheme, the pump digital twin structure calculation model specifically comprises:
the geometric model establishing unit is used for importing a geometric model according to the fluid calculation model and establishing a geometric model of the pump;
the mesh division establishing unit is used for leading in mesh division of a component to be analyzed according to a mesh division module in the fluid calculation model;
the structure numerical simulation obtaining unit is used for defining a fluid-solid action surface according to the selection of the fluid-solid coupling technology and carrying out structure simulation calculation by applying constraint and load;
and the structure calculation model establishing unit is used for establishing a pump digital twin structure calculation model through a geometric model, the grid division and the structure numerical simulation according to the pump digital twin fluid calculation model.
Further, the optimization scheme and the rotor system calculation model establishing module specifically comprise:
the rotor system establishing unit is used for establishing a three-dimensional model of the rotor system according to the geometric parameters of the pump rotor system;
the material attribute establishing unit is used for adding materials according to the size of the model and setting the unit of the material attribute to establish the material attribute;
the grid division establishing unit is used for selecting a unit of the rotor system model and dividing the grid of the rotor system according to the grid division software;
the inherent frequency calculation establishing unit is used for selecting an analysis type, setting an analysis option and calculating the inherent frequency analysis of the rotor system according to the structure of fluid-solid coupling calculation;
the static analysis establishing unit is used for carrying out static analysis on the rotor component under the conditions of simultaneously bearing the dead weight and the fluid-solid coupling acting force according to the finite element software;
and the critical rotating speed establishing unit is used for calculating the critical rotating speed by adopting a structural mechanics analysis module according to the discrete method of the rotor component and by considering the fluid-solid coupling effect and the influence generated by the clearance at the impeller mouth ring.
And the rotor system calculation model establishing unit is used for establishing a pump digital twin rotor system calculation model according to the pump digital twin fluid calculation model and the pump digital twin structure calculation model and through a rotor system three-dimensional model, the grid division, the natural frequency, the static force analysis and the critical rotating speed.
Further optimizing the scheme, the experimental test platform establishes the module, specifically includes:
the test platform building unit is used for building a pump open type test platform;
the data acquisition platform building unit is used for compiling a graphical language program based on software and building a data acquisition platform;
and the test platform establishing unit is used for establishing a pump digital twin test platform according to the test platform and the data acquisition platform.
As shown in fig. 2, this embodiment further provides a design method for hydraulic and structural collaborative optimization of a pump based on digital twinning, which includes the following steps:
step 1: establishing a pump digital twin fluid calculation model, as shown in fig. 3, specifically including:
and in the data collection stage, physical parameters such as the inlet and outlet angles of the impeller, the number of blades, the pipe diameters of an inlet and an outlet and the like are analyzed for the researched pump, and the hydraulic parameters such as flow, lift, efficiency and the like are recorded by combining production information of a manufacturer.
(2) And in the geometric modeling stage, editing according to a two-dimensional hydraulic diagram of the water pump according to actual conditions, importing 3D software to model the pump, and performing three-dimensional modeling on the whole flow passage fluid domain of the pump by using CREO, UG, spaceClaim and the like by using the modeling software in consideration of the gaps and leakage losses of the front cavity and the rear cavity of the pump.
(3) And in the fluid mesh division stage, interfaces of the pump, such as an inlet, an outlet, a wall surface, blades and the like, are defined, mesh drawing software is used for accurately dividing a computational domain into meshes, boundary layer meshes are reasonably divided, if the accuracy is higher, unstructured meshes are adopted, and ICEM CFD, fluent, spaceClaim and the like can be used as the software.
(4) And in the fluid numerical simulation stage, the inlet and outlet boundary conditions of the calculation domain are provided by test measurement results, and pressure sensors are adopted to measure inlet and outlet dynamic pressure related data respectively.
And 2, step: establishing a pump digital twin structure calculation model, as shown in fig. 4, specifically including:
in the data collection stage, physical parameters such as the inlet and outlet angles of the impeller, the number of blades, the pipe diameters of an inlet and an outlet and mechanical performance parameters are analyzed for the researched pump, and the structural parameters are recorded by combining the production information of a manufacturer;
in the geometric modeling stage, editing is carried out according to a two-dimensional engineering drawing of the water pump according to actual conditions, 3D software is introduced to carry out modeling on the pump, and the modeling software can carry out three-dimensional modeling on a solid structure area of the pump by using CREO, UG, spaceClaim and the like;
in the stage of solid mesh division, mesh types are selected and divided according to a complex solid structure of the pump, and ANSYS Workbench can be used as mesh division software;
in the structure numerical simulation stage, according to the selection of a fluid-solid coupling method, based on the calculation of a full-flow-channel flow field in Fluent, a solid structure area is subjected to static structure analysis in Workbench, flow extraction and solid analysis data are mutually transmitted through a fluid-solid coupling technology, and deformation response and stress distribution of a solid structure are analyzed through structure dynamics;
and step 3: establishing a pump digital twin rotor system calculation model, as shown in fig. 5, specifically including:
a data collecting stage, wherein data is collected according to a pump digital twin solid calculation model;
in the geometric modeling stage, a rotor system entity model is established according to geometric parameters of a pump rotor system, a rotor component mainly comprises an impeller, a coupler, a bearing, a supporting structure and the like, and CREO, UG, spaceClaim and the like can be used as modeling software;
in the material attribute stage, because software has no default unit setting, unit problems need to be paid special attention when the material attributes are input, the units need to be used uniformly, otherwise, errors occur in the final calculation result, materials are added according to the size of the model, the units of the material attributes are set, and the material attributes are established;
and a grid division stage, wherein a rotor system model unit is selected and the grid of the rotor part is divided according to grid division software, and the units suitable for analyzing the model in ANSYS comprise: SOLID45, SOLID95, SOLID186;
and in the natural frequency stage, selecting the analysis type as modal analysis, and setting analysis options. 7 mode extraction methods such as Block Lanczos, power dynamics, subspace, reduced and the like are provided in ANSYS, and the natural frequency of a rotor system is calculated;
in the critical rotating speed stage, according to a discrete method for selecting a rotor component and a fluid-solid coupling effect, the fluid-solid coupling not only considers the acting force of fluid force on the rotor component, but also takes the reacting force of the deformation of the rotor component to the fluid into consideration, and also considers the influences of the support rigidity, the rotating speed, the gyro moment and the clearance at the impeller opening ring, and a structural mechanics analysis module is adopted to calculate the critical rotating speed;
and 4, step 4: the method for establishing the pump digital twin test platform specifically comprises the following steps:
and at the test platform establishing stage, a pump open type test bed is established, and comprises equipment such as a pump, a motor, a pressure sensor, a valve, a flowmeter, a torquemeter and the like, wherein the pressure sensor is used for measuring the pressure of an inlet and an outlet of the pump, the motor is used for driving the operation of the pump, the valve is used for controlling the opening degree, the flowmeter is used for measuring the liquid flow, and the torquemeter is used for measuring the torque of the pump.
And a data acquisition platform establishing stage, compiling a graphical language program for synchronously measuring the hydraulic characteristic and the structural characteristic of the pump based on LabVIEW software, and acquiring the electric signal values output by sensing equipment such as a flow sensor, a pressure sensor and a torque meter by adopting a DAQmx program. A dynamic signal test analysis system, an acceleration sensor and a force hammer excitation system are adopted to carry out a pump modal experiment to obtain inherent dynamic characteristics of the pump, and the inherent dynamic characteristics can be compared with inherent frequencies in a rotor system digital twin calculation model to correct the pump digital twin rotor system calculation model and further accurately obtain the digital twin model.
And 5: according to the digital twin model shown in fig. 6, a high-precision mathematical model and a multi-objective optimization method shown in fig. 7 are provided, and a multi-objective optimization result is calculated, wherein the method specifically comprises the following steps:
and in the machine algorithm library establishing stage, the machine algorithm library is formed by machine learning and a multi-objective optimization algorithm. The machine learning learns the data generated when the system works, so that the characteristics related to the system state are obtained, and the mapping from the data to the system state is realized. Because the working environment of the pump changes complexly, the running process of the pump is a degradation process with nonlinear and non-Gaussian characteristics, and the performance target of the pump is closely related to the design variable, the construction of the nonlinear relation of the performance target and the design variable of the pump is particularly important. Meanwhile, on the basis of constructing a nonlinear relation, a multi-objective optimization algorithm is utilized to optimize the nonlinear relation, so that the working performance is optimized, and the aims of high efficiency and high stability are fulfilled.
In the stage of selecting the target and the design variable, hydraulic and structural parameters influencing the performance state of the pump are listed firstly, and then target variables representing the performance of the water pump are listed. Therefore, hydraulic and structural geometric parameters are selected as design variables, including a mouth ring gap width, a mouth ring length, an impeller outlet width, an impeller blade outlet installation angle, a guide vane inlet diameter, a guide vane blade inlet installation angle, a guide vane axial length, an interstage gap width, a balance drum gap width and the like, pump efficiency, pressure pulsation, critical rotation speed and the like are optimized, a Latin method test design is adopted to extract sample points of the hydraulic and structural parameters in a design space, construction of a nonlinear relation is carried out through machine learning, a multi-objective optimization algorithm is applied to optimize the relation, and the pareto front of pump dynamics is obtained. According to the pareto frontier, a series of combinations can be obtained, each design scheme is processed, and the feasibility of the scheme is verified on a pump test bench.
And in the programming calling stage, labVIEW software is used for building a user interface, a Python language is used for compiling a pump optimization program, a Python program is called through a Python node built in the LabVIEW, and an interface program of a BladeGen model, creo software and Workbench simulation software is compiled and called through the Python, so that a Latin-square test design multi-scheme real-time calling fluid, structure and rotor system dynamics solver is realized, and the automatic operation of three-dimensional pump design and digital twin numerical simulation is realized.
Step 6: according to the digital twin model and the machine algorithm module, the influence rule of multivariate correlation on the dynamic characteristics is revealed, and the hydraulic and structural collaborative design method shown in the figure 8 is established, which specifically comprises the following steps:
in the data collection stage, a series of combinations of design variables and optimization targets can be obtained according to the pareto frontier obtained by the machine learning module and through experimental verification;
and a regression equation setting stage, namely selecting a proper mathematical model according to the relation between the independent variable and the dependent variable to establish a regression equation.
A regression coefficient determining stage, namely substituting the known data into a set regression equation, calculating a regression coefficient by using a least square method principle, and determining the regression equation;
and in the correlation test stage, according to the determination of the regression equation, obtaining the change of the optimization target under the condition that the single design variable is changed and the other design variables are not changed, analyzing the influence degree of the optimization target, measuring the linear correlation degree among the multivariants by adopting a Pearson correlation coefficient, and being beneficial to testing the influence of the change trend of the design variables on the optimization target in the hydraulic and structural cooperative optimization.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (8)
1. Pump water conservancy and structure collaborative optimization design system based on digit twin, its characterized in that includes:
the calculation model establishing module is used for establishing a pump digital twin calculation model;
the calculation model building module comprises:
the fluid calculation model establishing module is used for establishing a pump digital twin fluid calculation model;
the structure calculation model establishing module is used for establishing a pump digital twin structure calculation model according to the pump digital twin fluid calculation model;
the rotor system calculation model establishing module is used for establishing a pump digital twin rotor system calculation model according to the pump digital twin fluid calculation model and the pump digital twin structure calculation model;
the test platform establishing module is used for establishing a pump digital twin test platform;
the digital twins model establishing module is used for establishing a digital twins model through the pump digital twins calculation model and the pump digital twins test platform;
the machine algorithm building module is used for building a machine algorithm model according to the digital twin model, and the machine algorithm model is used for calculating a multi-objective optimization result;
the collaborative design model building module is used for building a collaborative design model according to the digital twin model and the multi-objective optimization result, and the collaborative design model is used for carrying out collaborative optimization on the hydraulic power and the structure of the pump;
the process of hydraulic and structural co-optimization comprises the following steps:
performing test verification according to the pareto frontier to obtain the combination of the design variable and the optimization target;
selecting a mathematical model according to the relation between the independent variable and the dependent variable, and establishing a regression equation;
substituting the combination into a set regression equation, calculating a regression coefficient by using a least square principle, and determining the regression equation;
based on a regression equation, under the condition that a single design variable changes and other design variables are not changed, the change of an optimization target is obtained, the linear relevance degree among multiple variables is measured by adopting a Pearson correlation coefficient through analyzing the influence degree of the optimization target, and collaborative optimization is carried out based on the relevance degree.
2. The system of claim 1, wherein the fluid calculation model building module comprises:
the first geometric model building unit is used for building a first geometric model of the pump according to the geometric parameters of the physical entity of the pump;
the first grid division establishing unit is used for establishing a first grid division module, and the first grid division module is used for partitioning, determining the type of a grid unit and carrying out grid division on a calculation domain;
the fluid numerical simulation obtaining unit is used for carrying out numerical simulation on the flow field in the pump according to the pump grid division result to obtain a fluid numerical simulation result;
and the fluid calculation model establishing module is used for establishing a pump digital twin fluid calculation model according to the fluid numerical simulation result.
3. The system of claim 1, wherein the structural calculation model building module comprises:
the second geometric model establishing unit is used for importing the first geometric model according to the fluid calculation model and establishing a second geometric model of the pump;
the second grid division establishing unit is used for importing the grid division of the component to be analyzed according to the first grid division module;
the structure numerical simulation obtaining unit is used for carrying out structure simulation calculation according to grid division to obtain structure data;
and the structure calculation model establishing unit is used for establishing a pump digital twin structure calculation model according to the structure data.
4. The system for designing and optimizing a hydraulic and structural cooperation based on a digital twin pump according to claim 1, wherein the rotor system calculation model establishing module specifically comprises:
the rotor system establishing unit is used for establishing a three-dimensional model of the rotor system according to the geometric parameters of the pump rotor system;
the material attribute establishing unit is used for adding materials according to the size of the model and setting the unit of the material attribute to establish the material attribute;
the grid division establishing unit is used for selecting a unit of the rotor system model and dividing grids according to the grid division software;
the natural frequency calculation establishing unit is used for calculating the natural frequency of the rotor system according to the structure of fluid-solid coupling calculation;
the static analysis establishing unit is used for carrying out static analysis on the rotor component through finite element software;
a critical rotation speed establishing unit for calculating a critical rotation speed by a discrete method of the rotor part;
and the rotor system calculation model establishing unit is used for establishing a pump digital twin rotor system calculation model according to the pump digital twin fluid calculation model and the pump digital twin structure calculation model by combining the rotor system three-dimensional model, grid division, natural frequency, static force analysis and critical rotating speed.
5. A design method for hydraulic and structural cooperation optimization based on digital twin is characterized in that,
constructing a pump digital twin fluid calculation model;
constructing a pump digital twinning structure calculation model according to the pump digital twinning fluid calculation model;
constructing a pump digital twin rotor system calculation model according to the pump digital twin fluid calculation model and the pump digital twin structure calculation model;
establishing a pump digital twinborn test platform;
constructing a digital twinning model through the pump digital twinning fluid calculation model and the pump digital twinning test platform;
constructing a machine algorithm model according to the digital twin model, wherein the machine algorithm model is used for calculating a multi-objective optimization result;
constructing a collaborative design model according to the digital twin model and the multi-objective optimization result, wherein the collaborative design model is used for collaborative optimization of pump hydraulic power and structure;
the hydraulic and structural collaborative optimization method specifically comprises the following steps:
in the data collection stage, test verification is carried out according to the pareto frontier to obtain the combination of design variables and an optimization target;
a regression equation setting stage, namely selecting a mathematical model according to the relation between independent variables and dependent variables to establish a regression equation;
a regression coefficient determining stage, wherein the combination is substituted into a set regression equation, the regression coefficient is calculated by using a least square principle, and the regression equation is determined;
and in the correlation test stage, based on a regression equation, under the condition that a single design variable changes and other design variables are not changed, the change of an optimization target is obtained, the influence degree of the optimization target is analyzed, the linear correlation degree among multiple variables is measured by adopting a Pearson correlation coefficient, and the collaborative optimization is carried out based on the correlation degree.
6. The design method for the hydraulic and structural collaborative optimization of the digital twin-based pump according to claim 5, wherein the method for establishing the pump digital twin fluid calculation model comprises the following steps:
establishing a first geometric model of the pump according to the geometric parameters of the physical entity of the pump;
establishing a first grid division module, wherein the first grid division module is used for partitioning, determining the type of a grid unit and carrying out grid division on a calculation domain;
according to the pump grid division result, performing numerical simulation on a flow field in the pump to obtain a fluid numerical simulation result;
and establishing a pump digital twin fluid calculation model according to the fluid numerical simulation result.
7. The digital twin-based pump hydraulic power and structure collaborative optimization design method according to claim 5, wherein the method for establishing the pump digital twin structure calculation model comprises the following steps:
importing the first geometric model according to the fluid calculation model, and establishing a second geometric model of the pump;
importing the mesh division of the component to be analyzed according to a first mesh division module;
carrying out structural simulation calculation according to grid division to obtain structural data;
and establishing a pump digital twin structure calculation model according to the structure data.
8. The digital twinning-based pump hydraulic and structural collaborative optimization design method according to claim 5, wherein the method for establishing a pump digital twinning rotor system calculation model comprises the following steps:
establishing a three-dimensional model of the rotor system according to the geometric parameters of the pump rotor system;
adding materials according to the size of the model and setting units of material attributes to establish the material attributes;
selecting a unit of a rotor system model and dividing grids according to grid division software;
calculating the natural frequency of the rotor system according to the structure of fluid-solid coupling calculation;
performing static analysis on the rotor component through finite element software;
calculating the critical rotation speed by a discrete method of the rotor components;
and establishing a pump digital twin rotor system calculation model according to the pump digital twin fluid calculation model and the pump digital twin structure calculation model by combining the rotor system three-dimensional model, grid division, natural frequency, static force analysis and critical rotation speed.
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