87 results about "Finite element solution" patented technology

The invention discloses a method for analyzing the fatigue life of a steering knuckle, comprising the following steps: 1) obtaining the fatigue load of the steering knuckle; 2) carrying out uniaxial tensile material test on the use material; 3) if the fatigue load is under the static load condition, the elastic-plastic finite element analysis method is adopted to solve the problem; or, if it is the actual pavement load spectrum, the elastic-plastic finite element analysis is carried out on the points exceeding the yield strength by elastic finite element method and linear superposition method,and the modified stress-strain results are obtained. 4) analyzing the biaxiality of the obtained stress response in time domain to determine the load state of the steering knuckle; 5) calculating thedamage accumulation and life of steering knuckle. The present invention solves the problem of time-consuming finite element solution under the input of actual pavement load spectrum, at the same time, the stress and strain of the material entering the plastic phase are considered, so that the result is more accurate, and fatigue analysis is carried out by combining the static load condition or the single channel static load condition, and more references are provided in the design phase.

The invention discloses a generation method of planar spiral and annular milling tracks. The generation method comprises the following steps: acquiring a plane machining region of a multi-shaft cutter, performing triangle grid division on the plane machining region to construct an energy field; establishing a constraint equation of the energy field, performing finite element solution on the constraint equation to obtain a field function; establishing a divide curve family according to the finite element solution to acquire a cutting line of a length maximum value; calculating equal scalar value curves according to the cutting line of the length maximum value, and cutting the plane machining region into m sub-regions, wherein m is an positive integer; and respectively performing interpolation on each pair of equal scalar value curves in the m sub-regions to obtain spiral lines. According to the generation method of the planar spiral and annular milling tracks, the vibration generated in the machining process of a numerical control machine tool can be reduced, at the same time, the processing efficiency is improved, and the loss of the cutter is reduced.

The invention discloses a rapid design, analysis and optimization system of a large-scale structure based on modularization. The rapid designing, analyzing and optimizing system comprises a structural overall rapid layout design module, a structural preliminary rapid design and optimization module, a structural rapid modeling module, a structural rapid analysis module and a base database module. According to the whole design process of demand parameter input, structural design and strength analysis of products, rapid automatic optimization, rapid automatic modeling, automatic finite element model establishment, an automatic rapid finite element solution, automatic drawing of typical parts and process data management of the design process are realized by using a parameterized design idea, a modular system constructing technology, a database technology, a digitalized modeling technology, a finite element analysis technology, full-digitalization design and an analysis module customizing technology and fusing an automatic optimizing design method, a knowledge-driven design method and a top-down design method; the whole-process design acceleration is realized, the design efficiency is increased and the development cycle of products is shortened.

The invention provides a multi-physics field CAE system based on a cloud computing platform. The multi-physics field CAE system based on the cloud computing platform comprises a cloud client terminal, the cloud computing platform and a cloud database. The cloud client terminal, the cloud computing platform and the cloud database are in data communication through networks. The cloud client terminal comprises a user interaction platform. The cloud computing platform comprises a CAD modeling module used for establishing a CAD model, a meshing module used for dividing the CAD model into a grid data model after CAD dispersing, a multi-physics field setting module used for setting a multi-physics field parameter model, a finite element solution module used for conducting finite element solution calculation, and a result optimizing and evaluating module used for evaluating and optimizing the calculated results of the finite element solution module. The cloud database comprises a user database and a case base. According to the multi-physics field CAE system based on the cloud computing platform, the multi-physics field CAE technology is realized on the cloud computing platform, cost is saved for extensive enterprise users, computing resources are effectively utilized, and the introducing threshold of the multi-physics field CAE technology is greatly lowered.

The invention discloses a method for accelerating the finite element solution of the elastic deformation of an object mesh model. For a nonlinear elastic object model, given discrete is a coarse meshand a fine mesh formed by units and vertices, the displacement field of the coarse mesh is solved by a finite element method using a piecewise linear matrix function as a displacement interpolation function, and the displacement field of the fine mesh is solved by the finite element method using linear interpolation function as displacement interpolation function. The shape function of the finiteelement method corresponding to the coarse mesh is a specially designed piecewise linear matrix function, and the piecewise linear matrix function is a discontinuous function. The method is used for simulating the deformation of non-uniform and heterogeneous non-linear elastic objects, and the non-linear constitutive relation is also used for predictive simulation of heterogeneous elastic bodies on a coarse mesh to obtain acceleration of two to three orders of magnitude and make good approximation to the overall stiffness of the system.

The invention relates to an electric conductivity rebuilding method for magnetocaloric acoustical imaging. The electric conductivity rebuilding method is based on a magnetocaloric acoustical imaging principle. An exciting coil is used for exerting MHz current excitation on a conducting object, joule heat is generated in the conducting object, and further, ultrasonic signals are generated. An ultrasonic transducer is used for receiving the ultrasonic signals, the received ultrasonic signals are processed and collected, and then, an electric conductivity image of the conducting object is obtained by adopting an electric conductivity image rebuilding algorithm. The electric conductivity rebuilding method comprises the concrete steps that 1, firstly, high-signal-to-noise-ratio magnetocaloric acoustical signals are obtained; 2, the obtained magnetocaloric acoustical signals are used for rebuilding to obtain thermal sound source distribution of the conducting object; 3, the thermal sound source distribution and a one-order magnetic vector space component are used, and a non-linear finite element solution method is adopted for rebuilding a scalar potential space component; 4, the rebuilt scalar potential space component is used for rebuilding the electric conductivity.

The invention belongs to the technical field of mechanical dynamics, and particularly relates to a meshing characteristic analysis method of stripping bevel gear pair which is corrected by considering substrate rigidity. According to the method, firstly the gear tooth of a bevel gear pair is divided into N independent and uniform thin-sheet straight gears in the tooth width direction, and based on the known stripping size and position parameters, the stripping condition of each straight gear is determined; through a potential energy method, a finite element substrate rigidity correction coefficient is introduced to calculate the time-varying meshing rigidity of each single stripping straight bevel gear; based on ANSYS software parameterized programming, a three-dimensional finite element stripping bevel gear contact model is established, the time-varying meshing rigidity is solved and obtained, and analysis and comparison with an analysis method result are conveniently achieved. Based on an analysis and finite element solution method, the influence of the stripping width ws, the stripping length as, the stripping axial position and the stripping tooth-direction position on the bevel gear time-varying meshing rigidity is analyzed, and the influence of axial multi-stripping and tooth-direction multi-stripping on the bevel gear meshing rigidity is considered at the same time.

The invention discloses a finite element prediction method, under the action of force-electricity-heat multi-field coupling, of electrode-containing ferroelectric single crystal based on phase-field method analysis. The method comprises the following steps of establishing a new phase-field model with the multi-field coupling based on a Landau theory and an expansion interface model; obtaining the model establishment and the grid division of the electrode-containing ferroelectric single crystal by using ANSYS finite element software, and extracting node information and unit information; importing the obtained node information, the obtained unit information and considered different boundary condition information, and realizing a solution to the force-electricity-heat nonlinear coupling problem of the electrode-containing ferroelectric single crystal by using an FEAP fast solver; importing field variables which are obtained through FEAP finite element solution into a postprocessing program which is written by Fortran, and obtaining visual field variable results by using TECPLOT software. According to the method provided by the invention, not only is the process simple, but also the adaptability and the stability are good; a commercial finite element program can be developed to flexibly adapt to problem changes.

The invention discloses a blade element-momentum theory-based method for computing the uneven stressed load of an actuating disc. In order to overcome the defects that the conventional blade element-momentum theory method cannot effectively solve the related load calculation of the actuating disc when a fluid unevenly flows through the plane of the actuating disc and blade specifications and pitch angles in the actuating disc are different at the same time, the invention provides a quick analytic solution method expanded based on the traditional blade element-momentum theory, and provides a specific analytic solution formula, and specific iteration solution methods and steps for key variables, namely an axial inducing factor and a radial inducing factor. Compared with the common finite element solution method at present, the blade element-momentum theory-based method can greatly reduce the data solving requirement and the calculated amount, and is particularly suitable for the related calculation of the airload of a wind wheel of a megawatt variable speed variable propeller fan.

The invention provides a cracked gear-tooth meshing stiffness calculation method. According to the method, firstly, a precise gear model is established by means of the Solid Works. After that, the stress distribution of cracked gear teeth is solved out based on the finite element solution. Then a curve is drawn along a region of the gear teeth wherein the stress is widely distributed. With the above curve as a boundary, an effective thickness of the gear teeth with the occurrence of cracks is defined. According to the above novel method, the effective thickness is introduced into the calculation on the meshing stiffness of the cracked gear teeth. Meanwhile, with the integration of the rigidness of faulted gear teeth and the rigidness of faultless gear teeth, the stiffness variation diagram over the entire meshing period can be figured out. The effective thickness of the gear teeth is defined by the curve instead of a widely applied straight line. Compared with the conventional straight line-based meshing stiffness calculation method, the above method is higher in accuracy. The meshing stiffness calculation accuracy of the above method is also proved.

The invention provides a method for acquiring stress states of metallic frameworks of a power assembly suspension system. The power assembly suspension system comprises at least one suspension unit used for supporting a power assembly. Each suspension unit comprises a metallic framework and rubber. The method comprises the steps that the power assembly is simplified to be a centroid point, the mass of the power assembly is assigned to the centroid point, and the centroid point and all the suspension units are made into an overall model; a load is set for the power assembly suspension system, a contact relation is set for the driving end and the driven end of each suspension unit, and an installation constraint condition is set for each suspension unit according to a designed installation state to obtain a constraint overall model; and the constraint overall model is subjected to finite element solution to obtain the stress state of each metallic framework. Through the method for acquiring the stress states of the metallic frameworks of the power assembly suspension system, the actual work state of the power assembly suspension system can be truly simulated, and therefore the reliability of the acquired stress states of the metallic frameworks is high.

The invention discloses a simulation method for dynamic behavior dynamic grid unbalanced force elimination of high speed railway pantograph-catenary. The method comprises the following steps that step1: a pantograph-catenary nonlinear simulation model is constructed according to finite elements and a multi-body dynamics method; step 2: in each simulation step time (i)t(/i), the grids around contact points on a contact line are encrypted by using a dynamic grid method; step 3: an unbalanced force in the dynamic grids is eliminated by an iterative algorithm; step 4: the response of the simulation step time (i)t(/i) is solved by a Newmark-(i) Beta (i) algorithm; step 5: the steps from 2 to 4 are repeated, until the whole contact line is traversed by a pantograph, the dynamic simulation of pantograph-catenary is completed; the simulation method for dynamic behavior dynamic grid unbalanced force elimination of the high speed railway pantograph-catenary can eliminate the unbalanced force produced by using the dynamic grid technology, is used in nonlinear finite element solution, and the solution efficiency and the solution precision are improved.

The invention relates to a method for designing a receiving transducer of an electromagnetic ultrasonic surface wave, and aims to solve the problems that the conventional design of the receiving transducer of the electromagnetic ultrasonic surface wave is strong in noise receiving and complicated in processing. The method comprises the steps as follows: establishing the geometrical model of each element; setting material attributes; partitioning physical field solving areas; setting structural field parameters; setting electromagnetic field parameters; performing finite element subnetting and finite element solution; calculating induced voltage signals in receiver coils with different parameters; and completing the design of the receiving transducer of the electromagnetic ultrasonic surface wave eventually. According to the method for receiving the receiving transducer of the electromagnetic ultrasonic surface wave provided by the utility model, the modeling and solving for a receiving process of the transducer of the electromagnetic ultrasonic surface wave are achieved by the design method, the complete and accurate description of the receiving process of the electromagnetic ultrasonic surface wave is realized, and the influence on the received signal strength by parameters of different electromagnetic ultrasonic transducer is analyzed, so that the optimal transducer parameter combination is obtained.

A residual strength analysis method of an aircraft composite structure with large damage based on a Mar-Lin model belongs to the field of damage tolerance design and conformity certification of an aircraft composite main structure. The fracture toughness and singularity exponent n of the composites are determined by a data fitting method based on the low-order fracture test data of the composites,and a composite residual strength Mar-Lin model is built, an extrapolation method is utilized to expand the Mar-Lin model, and thus the residual strength of large-scale cracks is determined. A special finite element simulation method is used to simulate the structure and crack type of composite material and the finite element solution is carried out, then the energy release rate of crack tip is obtained by solving the finite element analysis results with the energy method, and finally, the geometrical influence factors of the structure are obtained by using the energy release rate of different configurations. The geometrical influence factors and Mar-Lin model determines the residual strength of the structure to be analyzed, and then judges whether the residual strength meets the requirements, and completes the analysis of large damage tolerance. The design risk and reliability of composite structures can be evaluated.

The invention belongs to the field of numerical simulation of particle-in-cell (PIC) and particularly relates to an electric potential finite element solution algorithm applied to a PIC electrostaticmodel. According to the algorithm, a complete unstructured grid is used and can better fit the shape of a model boundary, and accordingly an electric potential solution of the PIC electrostatic modelunder the complex boundary condition has higher calculation precision and solution speed; an FEM electric potential solution method which is used for solving non-particle-source problems such as passive electromagnetic field distribution, thermal analysis and mechanical analysis is combined with a typical PIC method, the good characteristics of simple and quick calculation of the typical PIC method are kept, and meanwhile the higher finite element calculation precision is obtained by using an FEM; since the FEM can be well matched with the complex boundary, an uneven grid can also be used according to the simulation demand, and the FEM is not limited by a numerical stability condition, under the condition that the calculation precision is guaranteed, the spatial grid and the time step canbe optimized, and accordingly the simulation efficiency is greatly improved.

The invention discloses an optimization algorithm-based shock absorber rigidity simulation method. The method comprises the following steps of: 1, establishing a corresponding physical model accordingto a geometric shape of a practical shock absorber; 2, partitioning finite element grids for the established model; 3, endowing the established shock absorber model with an orthotropic material attribute; 4, applying a fixed constraint to one end of the shock absorber and applying a unit load to the other end of the shock absorber, and carrying out finite element solution to obtain anisotropic rigidity of the shock absorber; and 5, carrying out optimization by taking an anisotropic elastic modulus of an orthotropic material as a design variable and aiming at enabling the anisotropic rigidity,obtained through finite element simulation, of the shock absorber is closest to anisotropic rigidity of a practical shock absorber, so as to accurately simulate rigidity of the practical shock absorber. According to the method, optimized material attributes are endowed with shock absorber finite elements, and finite element calculation is carried out on the whole engineering structures, so that more accurate solutions can be obtained.

The invention provides an unmanned vehicle structure damage tracking and fatigue estimating method. The unmanned vehicle structure damage tracking and fatigue estimating method comprises the steps that 1, collecting the load-time history at the joint of the structure part of the unmanned vehicle ; 2, according to the the load-time history at the joint of the structure part, carrying out, using damage mechanics-definite element solution to calculate damage degrees of all units of the structural part, and further comprising the following steps: step 21, calculating the damage degree of each unitof the structural member according to the load-time journey; According to the time history, solving a strain field of the structure under the initial damage degree D0 through a finite element method,and solving damage mechanics and other effect variations; Step 22: obtaining a damage degree increment dD under a given step length dN according to a damage evolution equation in a strain form, and accumulating the damage degree D = D0 + dD; wherein The cumulative load cycle number is N = N0 + dN; And 23, breaking the elastic model of the material, ED = E (1-D), repeating the steps 21 and 22 until the damage degree D of a certain unit reaches 1 wherein the number of output load cycles is the crack initiation life. According to the invention, the damage evolution process of each part of the unmanned vehicle structure can be monitored in real time, and the fatigue life of each part is estimated.

Embodiments of the present invention disclose a human body modeling method and apparatus. The method according to the embodiment of the present invention comprises the steps of: extracting key points in a human body model; connecting the key points into smooth curves, and deriving a curved surface and a body from the smooth curves, to obtain a geometric human body model; meshing the geometric human body model, to obtain a human body mesh model; applying a voltage to the human body mesh model, and performing finite element solution, to obtain an electric shock simulation result. The present invention can better simulate real human electric shock cases.

The invention discloses a tin-based binary eutectic alloy microstructure simulation and finite element solution analysis method, and relates to the field of computational material science. According to the method, the simulated eutectic structure is extremely similar to the eutectic structure acquired by an experimental instrument in shape, and the loading, solving and analysis of the eutectic structure can be realized on mainstream finite element CAE software and platforms (such as ANSYS, MARC, ABAQUS, MSC/PATRAN, COMSOL and the like); According to the method, the defects of the existing tin-based binary eutectic alloy microstructure detection technology can be overcome, and representation of the physical and mechanical behaviors of the microstructure of the tin-based binary eutectic alloy is achieved. According to the method, a Monte Carlo method and a finite element method are combined, the modeling efficiency of the eutectic structure is improved, loading solving and analysis of the eutectic structure are achieved, a new method is provided for feature analysis and reliability analysis of the eutectic structure, and the problems of microstructure modeling and performance characterization of the eutectic structure are well solved.

The invention provides a method for measuring internal residual stress of a thick plate welding part. The method is based on an inherent strain method, the welding inherent strain is decomposed, and an original welding sample is cut into simple samples in different forms; measuring residual stress values of the simple samples by adopting an X-ray diffraction method, and then inversely calculating inherent strain distribution conditions of the simple samples by adopting a finite element method; finite element solution is carried out on the internal residual stress by applying the inherent strain. Comprising the following steps: decomposing inherent strain distribution according to distribution characteristics of inherent strain, cutting a welding part, and separating out a plurality of different samples; the cut surface is treated, and the residual stress of the cut surface is measured through an X-ray diffraction method; establishing a sample two-dimensional inherent strain calculation model according to a measurement result, and inversely calculating the inherent strain; finally, an original thick plate welding part internal residual stress calculation model is established, the inherent strain acts on the model, thick plate welding part internal residual stress distribution is obtained, the measurement result is reliable, and efficiency is high.