8results about How to "Simulation results are reliable" patented technology

This invention discloses a finite element analysis method for seat body pressure distribution based on gravity, comprising the following steps: First, combining the shape data of the seat cover, the engineering data of the foam and suspension lines are determined; during modeling, in addition to the seat frame, plastic parts, and foam, the cover and suspension lines are also included, and the initial penetration of the foam and cover is preserved; a prestress file for the foam and cover is generated; the suspension lines are simulated using 1D spring elements; the generated prestress file is imported into the established finite element model of the entire seat, and the final seat model includes the prestress of the foam wrapped by the cover with suspension lines; a dummy model is imported; the dummy is positioned; an acceleration at an angle of 40-50° to the z-direction is applied; a total of ten steps. The simulation process is simple, the simulation results are more realistic and reliable, reducing seat development costs and shortening the development cycle, and is an effective means of early comfort verification in the seat R&D process.

The invention discloses a method and a system for identifying key biological class groups influencing a lake ecosystem based on a sectional structure equation model, relates to the technical field of environmental ecology, and comprehensively investigates the biocenosis diversity and ecological function characteristics of a lake. A nutrition structure of a lake ecosystem is constructed by analyzing the predation relationship among biological groups; the multifunctionality of the lake is evaluated by integrating clustering analysis and a functional threshold method; the method comprises the following steps: constructing a sectional structure equation model based on a nutrition structure relationship of a food web, fitting each path in the model through a mixed effect model, analyzing a path coefficient between nutrition level richness and multifunctionality, and calculating direct and indirect effects of the path coefficient; and finally, identifying the key biological class group which has the greatest influence on the ecological function of the lake. According to the method, the key biological class groups with decisive influence on the ecological function of the lake can be accurately identified, a clear target is provided for ecological protection and restoration, and the method has practical reference significance in making practical restoration management measures.

The present application relates to the technical field of atomization numerical simulation, and relates to an atomizer atomization numerical simulation method and system based on temperature variation characteristics, which comprises the following steps: confirming a test atomizer set and an ambient temperature set, obtaining a plurality of normal liquid viscosity sets and a plurality of normal liquid droplet surface tension sets, obtaining an optimized temperature interval, constructing a viscosity surface tension momentum equation, setting a solver parameter, sequentially extracting an optimized temperature value from the optimized temperature interval, simulating a pre-constructed simulation atomizer according to the solver parameter, the optimized temperature value and the viscosity surface tension momentum equation, obtaining a simulation atomization parameter, otherwise, taking the simulation atomization parameter as an optimized atomization parameter, summarizing the optimized atomization parameters, obtaining an optimized atomization parameter set, obtaining an optimal atomization parameter, and completing the atomizer atomization numerical simulation based on the temperature variation characteristics based on the optimal atomization parameter. The present application can improve the performance and atomization effect of the atomizer.

The application discloses a kind of double box girder flow field dynamics modal and flow stability analysis method and system, belong to bridge engineering field.This method first establishes double box girder flow field model by computational fluid dynamics, solves the momentum equation and continuity equation of two-dimensional incompressible flow;Dynamic modal decomposition is carried out again, and eigenvalue, characteristic mode and other information are obtained;Finally, based on linear stability theory, the flow field component is expressed as the sum of steady-state solution and disturbance term, and the global linear flow stability equation is obtained by substituting into the equation, and the flow stability is analyzed by discrete.This method can accurately extract the modal characteristics of each order, providing a scientific basis for wind-induced vibration analysis of double box girder, and has important application value.The method of the application occupies less computing resources, has high numerical accuracy, and can be further expanded to higher precision calculation model according to computing resources, and is suitable for application in actual bridge engineering.

The invention relates to a real-time interactive hybrid ocean simulation method and simulation system based on unified spectrum control, and the method comprises the following steps: obtaining environment wind field parameters, and generating a unified ocean wave spectrum; based on the unified sea wave spectrum, generating a JONSWAP spectrum model by adopting fast Fourier transform, and simulating a global wave field by using the JONSWAP spectrum model; and determining the position of an interactive object, dynamically injecting wave particles at the boundary of a local area corresponding to the position based on the unified sea wave spectrum, generating near-field fluctuation, and superposing the near-field fluctuation to a global wave field to form a continuous mixed sea surface. Compared with the prior art, the method has the advantages of uniform spectrum control, efficient parallel computing, high physical consistency, high expandability and the like, and uniform simulation of the large-scale continuous sea surface and the local interaction area is realized.

The application relates to a method for determining an asymmetric three-dimensional potential sliding surface by using maximum shear strain increment. The method comprises the following steps: establishing a geomechanics model and arranging equidistant vertical lines and measuring points, calculating the position of the measuring point with the maximum shear strain increment on each vertical line; determining the circular in-group to which all the measuring points in the measuring point set with the maximum shear strain increment belong through iteration; forming a preliminary slope surface exposed sliding surface boundary line according to the shape presented by the measuring points in the circular in-group, supplementing the missing boundary measuring points, and obtaining the supplemented slope surface exposed sliding surface boundary line; searching for all the measuring points with the maximum shear strain increment located within the supplemented slope surface exposed sliding surface boundary line, grouping the measuring points with the maximum shear strain increment and the measuring points of the supplemented slope surface exposed sliding surface boundary line, and then sequentially connecting the measuring points to obtain a three-dimensional potential sliding surface; and calculating the stability safety factor of the potential sliding surface. The search result accuracy of the slope sliding surface is improved.

The invention relates to the technical field of tunnel water gushing grouting experiments, in particular to an experimental device and method for simulating tunnel water gushing grouting filling. The experimental device comprises a test box, the interior of the test box is provided with a cavity, the cavity is used for being filled with a material simulating a tunnel rock stratum material, the test box is provided with a water inlet and a water outlet, the water outlet is provided with a gushing water collecting part, and the gushing water collecting part is used for collecting gushing water overflowing from the water outlet; the grouting angle adjusting device comprises a movable nozzle, the movable nozzle is installed at the water outlet, the movable nozzle is used for grouting towards the water outlet, and the movable nozzle can swing back and forth in at least one direction. By adopting the device, the grouting angle can be adjusted under the condition that the position of the test box is fixed, the grouting and filling effects at different grouting angles are simulated, the effect influence test research of grouting and filling at different grouting angles is realized by collecting and recording the water inflow, and the test result is more real and reliable.

The invention discloses a CAE analysis method for seat body pressure distribution based on a forced displacement method, which includes the following steps: firstly, combining the modeling data of the seat cover, determining the engineering data of the foam and the tension line; when modeling, in addition to the seat frame, plastic parts and foam, the cover and the tension line are also included, and the initial penetration between the foam and the cover is retained; forming a prestress file of the foam and the cover; simulating the tension line with a 1D spring unit; importing the formed prestress file into the established seat whole chair finite element model, and the final seat model includes the prestress of the cover with the tension line wrapping the foam; importing the dummy model; positioning the dummy; according to the initial position of the dummy, loading the forced displacement reaching the theoretical R point of the dummy to simulate the process of a person sitting on the seat, and setting the pressure output on the card.intfor; a total of ten steps. The simulation process is simple, the simulation result is more real and reliable, the seat development cost is reduced, the development cycle is shortened, and it is an effective means of early comfort verification in the seat development process.