31results about How to "Accurate boundary conditions" patented technology

The invention provides a refuse incinerator which comprises a fume spiral channel device, an incinerator body, a hot air gathering slot, a fume exhaust tube and a chimney, wherein the hot air gathering slot is arranged at the bottom of the incinerator body and is fixedly connected with the bottom surface of the incinerator body; the incinerator body comprises an insulating layer and an inner core layer; a space is reserved between the insulating layer and the inner core layer, thus forming a cold air preheating duct; the side wall at the top of the inner core layer is provided with an air hole; the side wall of the upper part of the incinerator body is provided with a feed port; fire bars are arranged on a bottom plate of the incinerator body; the fume spiral channel device is arranged at the top of the incinerator body; a fume spiral channel outer plate and the incinerator body define a fume spiral channel; the chimney is communicated with the fume spiral channel; and the fume exhaust tube is arranged on the side wall of a bottom end. The refuse incinerator has the advantages that the failure rate is low; the service life is long; the problem of influence of coking on fume flow path and oxygen supply in a hearth can be avoided; the refuse incinerating capacity is increased; and the incineration effect is good.

The invention discloses a method for determining tie line power feasible region based on multi-parameter programming theory, which mainly comprises the following steps: 1) acquiring power network basic parameters under AC tie line and power network basic parameters under DC tie line. 2) According to the basic parameters of power network under AC tie line, the optimal power flow model of external network under AC tie line is established. 3) According to the basic parameters of the power network under the DC tie line, the optimal power flow model of the external network under the DC tie line isestablished. 4) solving the feasible region of the power of the AC tie line; 5) solving that feasible region of the power of the DC tie line. The invention can accurately depict the feasible region ofthe power of the DC tie line and the AC tie line, provides accurate tie line boundary conditions for the optimization of the regional power network, and ensure the safety and economy of the optimization result of the regional power network.

The invention discloses a test determination method for a friction coefficient of a contact surface of a bearing cap and a bearing pedestal. First a test device comprising connection bolts, the bearing cap and the bearing pedestal is mounted; the connection bolts are loaded for a test; loaded bolt pump pressure and related data of the opening amount of two sides of the bearing cap corresponding to the bolt pump pressure are measured and recorded; corresponding relationships between the bolt pump pressure and the expanding volume in a test result are obtained; analogue simulation calculation under different friction coefficient preset values is carried out on the loading processes of the connection bolts by employing a finite element method, and the corresponding relationships between the bolt pump pressure and the corresponding the opening amount of two sides of the bearing pedestal under the friction coefficient preset values in a simulation result are obtained; a scatter diagram for the relationships of the opening amount of two sides of the bearing cap and the bolt pump pressure is made according to the test result and the simulation result; and the simulation result and the test result are compared, and the friction coefficient of the contact surface of the bearing cap and the bearing pedestal is determined according to the closest data. According to the method, the friction coefficient of the contact surface of the bearing cap and the bearing pedestal that better satisfying a practical structure can be obtained; a more precise boundary condition is provided for strength check of the complete machine, and the research and development cycle is shortened.

The invention relates to a rock inhomogeneous mechanical parameter inversion method based on DSCM-FEMU. The method comprises the steps of observing the deformation of the test piece in the rock loading experiment process based on a digital speckle correlation method, and calculating a strain field; based on a finite element model correction method, establishing a numerical calculation model for experimental loading in the ABAQUS, giving initial elastic parameters of each unit, assigning the elastic parameters of each unit by using a Python program based on weibull distribution, performing finite element calculation, and automatically outputting a stress field of the numerical model through the Python program; based on the finite element theory, deducing a rock inhomogeneous mechanical parameter inversion objective function, representing the difference between an experimental measurement strain field and a numerical calculation strain field, using an optimization algorithm to minimize the objective function, outputting most matched elastic parameters of each unit, and if the objective function does not meet an iteration convergence condition, automatically modifying the elastic parameters of each unit through a Python program, substituting the elastic parameters into a new round of finite element calculation until the objective function converges, and outputting the elastic parameters of each unit.

A coronary flow reserve score calculating method based on ultrasonic and CT imaging technology relates to the field of biomedical engineering and biomechanics. The method mainly settles a technical problem of obtaining a coronary blood flow according to coronary ultrasonic technology and distributing the blood flow volume of each branch of the coronary vein, thereby supplying an accurate-number individualized boundary condition for noninvasive FFRCT calculation, and ensuring high accuracy in FFRCT number simulated calculation. The method of the invention can obtain the individualized blood flow volume information of each branched blood vessel of a patient coronary vein through the coronary ultrasonic blood flow data of the patient, and supplies an accurate boundary condition for FFRCT calculation, thereby improving FFRCT calculation accuracy.

The invention provides an urban multi-scale wind environment numerical simulation method, which comprises the following steps of: generating a circular urban terrain model taking a city as a center, embedding an urban building group model into the urban terrain model through model inlaying, and establishing a wide-area urban overall model; extracting a wide-area city overall model by adopting Boolean subtraction operation, segmenting the wide-area city model in a form of a round outside and a square inside, and performing simulation; extracting an embedded local block model, performing interpolation on the boundary, and providing an accurate wind environment boundary condition for the local block model and performing simulation. According to the method, a nested model method is adopted, unreasonable inflow boundary assumption can be avoided in large-scale urban overall simulation, and a reasonable flow velocity boundary is provided for a local block model directly after urban macroscopic wind field simulation; meanwhile, the urban overall model adopts a circular boundary form, and the same set of grids can be adopted for different wind speed directions, so that the workload of modeling and grid multi-time division is greatly reduced.

The invention relates to a finite element numerical simulation analysis method based on a space grid, and the method is characterized in that the method comprises the following steps: performing grid segmentation on a space for physical field analysis and calculation to obtain the space grid; discretizing an object to be analyzed into particles; if the object to be analyzed deforms, enabling the particles to change, but enabling the space grids not to change; when next analysis and calculation are carried out on the object to be analyzed after deformation, giving new physical quantity fields to the particles contained in the space grids again, performing finite element analysis and calculation on the new physical quantity fields, obtaining the physical values of all nodes, and then obtaining the physical values of the particles through interpolation calculation according to the physical values of all the nodes. According to physical field analysis and calculation, finite element analysis is carried out by using a space grid; and the calculation of a physical value of the analyzed object is performed: the physical value of the analyzed object is obtained by discretizing each particle and performing interpolation calculation on the nodes of the space grid where the particles are located, and the analyzed object changes according to the obtained physical value.

The invention discloses a method for determining object surface temperature under a fog-comprising condition. The method comprises the steps that: a fog-drop size distribution model and a fog-drop motion model are established; a heat transfer model of object surface under the fog-comprising condition is decomposed into a plurality of sub-models; a collision adsorption model of the fog-drops and the surface is established according to the fog-drop size distribution model and the motion model; an evaporation model of liquid film formed on the surface, a surface dew condensation model, a surface convection heat transfer model, a radiative heat transfer model between the surface and the atmosphere background, and a solar radiation model are established; object surface total heat flow is determined according to the object surface sub-models under the fog-comprising condition; and object surface temperature distribution is obtained according to an energy equation. According to the invention, the heat transfer model suitable for the object surface under a fog-comprising condition is established. Under a situation that external flow field is not calculated, the influences of external environments are converted into a plurality of reasonable and accurate boundary conditions. Therefore, object temperature field can be highly efficiently and rapidly calculated.

The invention provides a device and a method for measuring excitation force of a cam shaft on a cam bearing cover. The device takes an existing cam bearing cover as a prototype, is divided into an inner component and an outer component, and is provided with pressure sensing sheets in the horizontal direction and the vertical direction between the inner component and the outer component; the two sides of the horizontal pressure sensing piece make plane contact with the inner component and the outer component respectively, the vertical pressure sensing piece is pre-tightened to the top part of the inner component through using an adjusting bolt at the top part of the outer component, thereby guaranteeing that the excitation force of the cam shaft is accurately transmitted to the pressure sensing piece by adjusting the position relation among the outer component, the inner component, the adjusting bolt and the pressure sensing piece. According to the method, the measuring device is adopted to collect the excitation force generated by the cam shaft in the horizontal direction and the vertical direction respectively, signals output by the pressure sensing piece are converted according to the calibrated relation, and stress data can be obtained. The device and the method can be used for measuring the stress of the cam bearing cover in the horizontal direction and the vertical direction accurately , so as to accurately reflect the excitation force of the cam shaft on the cam bearing cover.

The invention discloses a metal additive forming part surface heat transfer coefficient simulation method based on heat flow coupling. The method comprises the following steps: (1) compiling a geometric model of a printed part and a flow field around the printed part by utilizing three-dimensional drawing software, and carrying out finite element analysis; (2) endowing the geometric model with corresponding material attributes; (3) performing tetrahedral mesh division on the geometric model; (4) establishing a temperature field heat transfer analysis module for solving the metal additive printing process; (5) establishing a volume heat source module for simulating a laser heating process in metal additive printing; (6) establishing a fluid analysis module for solving a flow field model in the metal additive printing process; and (7) setting solving time and solving the temperature field and the flow field at the same time to obtain a surface heat transfer coefficient. The printed piece surface heat transfer coefficient obtained by the method provides accurate boundary conditions for numerical simulation (such as heat flow simulation and thermal simulation) of additive manufacturing, so that the numerical simulation result is accurate.

The invention is suitable for the technical field of steelmaking and continuous casting and provides an analysis system for thermal state performance test data of a continuous-casting secondary cooling nozzle. The analysis system comprises a calculation condition setting module, a data input and output module and a data calculation module, wherein a steel grade physical-parameter database module in the calculation condition setting module is used for storing the physical parameters of various test steel grades, and a cooling medium temperature parameter setting module in the calculation condition setting module is used for setting the parameters of temperature and environment temperature of cooling water for testing; the data input and output module is used for inputting time-temperature data of the thermal state performance test for a tested sample into the data calculation module; the data calculation module utilizes the inverse heat transfer problem to calculate the surface temperature of the tested sample and corresponding heat transfer coefficients, so that interference factors brought by an artificial calculation process are greatly eliminated, and an accurate boundary condition is provided for slab temperature field calculation of related key technologies in the continuous casting process.

The invention discloses a method and device for identifying the relation between the opening degree of a guide vane of a water turbine and the stroke of a servomotor, and the method comprises the steps: obtaining the active power of a water-turbine generator set under different servomotor strokes through a real machine test, and carrying out the conversion processing of a constructed servomotor stroke and active power curve, obtaining a relation between servomotor stroke and water turbine unit torque; according to the comprehensive characteristic curve of the water turbine model, water turbine torque characteristic curves under different guide vane opening degrees are obtained, interpolation processing is conducted on the water turbine torque characteristic curves, and the relation between the guide vane opening degrees and the water turbine unit torque is obtained; and according to the relation between the servomotor stroke and the water turbine unit torque and the relation between the guide vane opening and the water turbine unit torque, the relation between the guide vane opening and the servomotor stroke is obtained. According to the method, real machine testing and model comprehensive characteristic curve calculation are adopted, the accurate relation between the guide vane opening degree and the servomotor stroke can be rapidly, simply and conveniently obtained, and accurate boundary conditions are provided for modeling simulation of an adjusting system.

The name of the invention is PALM-based method for realizing WRF simulation wind field downscaling processing. The invention belongs to the field of urban meteorological environment, and discloses a PALM-based method for realizing WRF simulation wind field downscaling processing, and the method comprises the following steps: 1) building a complex terrain CFD model based on GIS data; 2) using a mesoscale WRF model to simulate and provide meteorological variables required by the PALM model; 3) realizing data coupling of the WRF model and the complex terrain CFD model; 4) extracting an initial value of the complex terrain CFD model at the initial calculation time and refined three-dimensional grid meteorological data changing along with time on the boundary; 5, the PALM is operated, and a high-resolution wind field simulation result is obtained.By means of the method, a computer-supported programming language can be used, a CFD model of a complex terrain and a building can be established in a parameterized mode, data coupling of the WRF model and the CFD model is achieved, and improvement of precision of wind field numerical simulation and air pollution distribution in an urban boundary layer is facilitated.

The invention is suitable for the technical field of steelmaking and continuous casting and provides an analysis system for thermal state performance test data of a continuous-casting secondary cooling nozzle. The analysis system comprises a calculation condition setting module, a data input and output module and a data calculation module, wherein a steel grade physical-parameter database module in the calculation condition setting module is used for storing the physical parameters of various test steel grades, and a cooling medium temperature parameter setting module in the calculation condition setting module is used for setting the parameters of temperature and environment temperature of cooling water for testing; the data input and output module is used for inputting time-temperature data of the thermal state performance test for a tested sample into the data calculation module; the data calculation module utilizes the inverse heat transfer problem to calculate the surface temperature of the tested sample and corresponding heat transfer coefficients, so that interference factors brought by an artificial calculation process are greatly eliminated, and an accurate boundary condition is provided for slab temperature field calculation of related key technologies in the continuous casting process.

The invention discloses a test determination method for a friction coefficient of a contact surface of a bearing cap and a bearing pedestal. First a test device comprising connection bolts, the bearing cap and the bearing pedestal is mounted; the connection bolts are loaded for a test; loaded bolt pump pressure and related data of the opening amount of two sides of the bearing cap corresponding to the bolt pump pressure are measured and recorded; corresponding relationships between the bolt pump pressure and the expanding volume in a test result are obtained; analogue simulation calculation under different friction coefficient preset values is carried out on the loading processes of the connection bolts by employing a finite element method, and the corresponding relationships between the bolt pump pressure and the corresponding the opening amount of two sides of the bearing pedestal under the friction coefficient preset values in a simulation result are obtained; a scatter diagram for the relationships of the opening amount of two sides of the bearing cap and the bolt pump pressure is made according to the test result and the simulation result; and the simulation result and the test result are compared, and the friction coefficient of the contact surface of the bearing cap and the bearing pedestal is determined according to the closest data. According to the method, the friction coefficient of the contact surface of the bearing cap and the bearing pedestal that better satisfying a practical structure can be obtained; a more precise boundary condition is provided for strength check of the complete machine, and the research and development cycle is shortened.

The invention discloses a calculation method for the concentration distribution of radioactive gas diffused in underground rock mass, comprising the steps of: 1) modeling the underground cavern mountain body, and obtaining the water level distribution through two-dimensional saturated-unsaturated seepage analysis; 2) solving the unstable 3) Calculate the diffusion coefficient, adsorption coefficient and absorption coefficient of radioactive gas in the cracked air of underground rock mass, and analyze the half-life of radioactive gas; 4) Establish the two-dimensional unsteady diffusion equation of the radioactive gas in the underground rock mass; 5) Solve the two-dimensional diffusion equation of the radioactive gas in the underground rock mass above the groundwater level to obtain its concentration distribution. The diffusion model of radioactive gas in underground rock mass is established, which can systematically, scientifically and accurately calculate the concentration distribution of radioactive gas in underground rock mass, and provide theoretical support for the prevention and control of radioactive pollution in underground nuclear facilities.

The invention relates to a method for inversion of non-uniform mechanical parameters of rock based on DSCM-FEMU. Based on the digital speckle correlation method, the deformation of the specimen during the rock loading experiment was observed, and the strain field was calculated; based on the finite element model correction method, the numerical calculation model of the experimental loading was established in ABAQUS, and the initial elastic parameters of each element were given, using Python The program assigns the elastic parameters of each element based on the Weibull distribution, performs finite element calculation, and automatically outputs the stress field of the numerical model through the Python program; based on the finite element theory, the inversion objective function of the non-uniform mechanical parameters of the rock is deduced, representing the strain field measured by the experiment. Using the optimization algorithm to minimize the objective function and output the most matching elastic parameters of each element, if the objective function does not meet the iterative convergence conditions, the elastic parameters of each element are automatically modified through the Python program, and the new elements are substituted. In one round of finite element calculation, until the objective function converges, the elastic parameters of each element are output.

The invention discloses a method for simulating the surface heat transfer coefficient of a metal additive formed part based on heat flow coupling, which includes the following steps: (1) using a three-dimensional drawing software to prepare a geometric model of the printed part and the flow field around the printed part and perform finite element analysis; (2) ) Assign corresponding material properties to the geometric model; (3) Use tetrahedral mesh division for the geometric model; (4) Establish a heat transfer analysis module for solving the temperature field in the process of metal additive printing; (5) Establish a module for Volume heat source module for simulating the laser heating process in metal additive printing; (6) Establish a fluid analysis module for solving the flow field model in the metal additive printing process; (7) Set the solution time and solve the temperature field and flow field at the same time Get the surface heat transfer coefficient. The surface heat transfer coefficient of the printed part obtained by the present invention provides accurate boundary conditions for numerical simulations (such as heat flow simulations and thermal simulations) related to additive manufacturing, so that the numerical simulation results are accurate.

The invention discloses a coupling calculation method of one and two circuits of a nuclear power system. The steps are as follows: 1. Establish a three-dimensional geometric model of a reactor steam generator and divide the grid, and establish a one-dimensional simplified model of a nuclear reactor one and two circuits; 2. Use a calculation fluid The dynamics software sets the initial boundary conditions of the geometric model of the steam generator and the initial state of the calculation domain; 3. The computational fluid dynamics software calculates the steam generator model, obtains the calculation results, and transfers the calculation results to the system analysis program as a system analysis The boundary conditions of this time step of the program; 4. The system analysis program calculates the first and second loop models, obtains the calculation results, and transmits the calculation results to the computational fluid dynamics software as the calculation time of the next time step of the computational fluid dynamics software 5. Repeat steps 3 and 4 until the reactor system model completes the full-time calculation. Complete the multi-dimensional and high-fidelity coupling analysis of the reactor system.

The invention discloses a method for determining object surface temperature under a fog-comprising condition. The method comprises the steps that: a fog-drop size distribution model and a fog-drop motion model are established; a heat transfer model of object surface under the fog-comprising condition is decomposed into a plurality of sub-models; a collision adsorption model of the fog-drops and the surface is established according to the fog-drop size distribution model and the motion model; an evaporation model of liquid film formed on the surface, a surface dew condensation model, a surface convection heat transfer model, a radiative heat transfer model between the surface and the atmosphere background, and a solar radiation model are established; object surface total heat flow is determined according to the object surface sub-models under the fog-comprising condition; and object surface temperature distribution is obtained according to an energy equation. According to the invention, the heat transfer model suitable for the object surface under a fog-comprising condition is established. Under a situation that external flow field is not calculated, the influences of external environments are converted into a plurality of reasonable and accurate boundary conditions. Therefore, object temperature field can be highly efficiently and rapidly calculated.

The invention discloses a calculation method for traction characteristics of straight-line running of a transport vehicle, relates to a calculation method for straight-line traction characteristics of vehicles, and belongs to the field of vehicle power calculation. The invention includes the following steps: Step 1: comprehensively consider various working conditions, and establish the relationship between the unit traction force and the straight-line speed of the engine under stable working conditions from the perspective of statistical probability of working conditions. Step 2: Use the relationship established in step 1 to establish the relationship between the unit traction force and the straight-line speed of the engine under steady working conditions, and calculate the traction force of the engine in each gear and the corresponding vehicle speed under different working conditions, and then evaluate the vehicle in a given working condition. The possibility of straight-line driving at a constant speed can be used to predict the steady-state performance of transport vehicles. The invention can be used for predicting the straight-line driving traction characteristics of mechanical or hydromechanical transmission piston engine wheeled or crawler vehicles.

The invention relates to a finite element numerical simulation analysis method based on spatial grid, which is characterized in that it comprises the following steps: dividing the space calculated by physical field analysis into grids to obtain spatial grids; discretizing the objects to be analyzed Particles; if the object to be analyzed is deformed, the particles will change, but the space grid will not change; when the object to be analyzed after the deformation is subjected to the next analysis and calculation, the particles contained in the space grid will be re-assigned new values. physical quantity field, and then perform finite element analysis and calculation on the new physical quantity field to obtain the physical value of each node, and then calculate and obtain the physical value of the particle according to the physical value of each node. The physical field analysis and calculation of the present invention uses spatial grids to perform finite element analysis; the calculation of the physical value of the analyzed object is obtained by discretizing each particle by interpolating the nodes of the spatial grid where the particle is located, and the analyzed object is calculated according to the Get the physical value to change.

The invention relates to a containment local component strength test device, which comprises a rigid counterforce base, a radial actuator group, a hydraulic oil loading mechanism and a pair of circumferential sliding support mechanisms; wherein the rigid counterforce base is provided with an actuator group placing groove, the radial actuator group is arranged in the actuator group placing groove and is communicated with the hydraulic oil loading mechanism, and the annular sliding supporting mechanisms are arranged on the two opposite side walls of the actuator set containing groove respectively. Compared with the prior art, the device has the advantages of being simple, convenient to disassemble and assemble, low in cost, suitable for tests of containment vessels of different sizes and the like, the load condition and boundary conditions of the containment vessel under accidents can be accurately reflected, the purpose of researching the strength performance of local components of the containment vessel can be achieved, and the requirements for economy and sustainable development are met.

The invention relates to a device for measuring the frictional force between an oil nozzle and a needle valve, and the device is characterized in that the device comprises a force sensor, a support, a vibration test bench, and a needle valve clamping tool; the top surface of the vibration test bench is provided with the needle valve clamping tool; the needle valve clamping tool is used for clamping the needle valve; the upper end of the needle valve is in cup joint with the oil nozzle; the upper end of the oil nozzle is rigidly connected with the force sensor; the force sensor is disposed at the bottom of the support; the height of the support can be adjusted so as to enable the reading, caused by gravity, of the force sensor to be zero; the vibration test bench drives the needle valve to move up and down, so as to simulate the movement state of the needle valve of an oil injector in an actual work process; the force sensor measures the frictional force between the needle valve and the oil nozzle. The device is simple in structure, and employs the vibration test bench to simulate the movement state of the needle valve, so as to measure the frictional force between the needle valve and the oil nozzle, and provide more accurate boundary conditions for the subsequent design and development of the oil injector, simulation and calculation, and characteristic research of fuel oil.