83 results about "Modal superposition" patented technology

The invention discloses a rotor blade dynamic field rapid reconstruction method based on a deep neural network model, and the method comprises the steps: firstly collecting a BTT signal containing blade vibration information, then designing a deep neural network model, and training the deep neural network model through a training data set; processing the actually measured BTT signal by using the trained deep neural network model, and reconstructing a blade vibration displacement signal; performing spectral analysis on the reconstructed blade vibration displacement signal, and identifying vibration frequency, amplitude and phase parameters; then establishing a finite element model of the blade, and determining the inherent frequency and modal shape of the blade through modal analysis; and finally, quickly calculating a displacement field, a strain field and a stress field of the blade in a vibration state based on a modal superposition theory by utilizing the identified vibration parameters and modal analysis results. According to the invention, the vibration displacement and stress condition of the blade can be known in real time, so that real-time decision is supported, and the safety, reliability and durability of a rotating machine are improved.

The invention discloses a vehicle paint surface scratch detection device fused with multi-modal imaging, and relates to the technical field of vehicle scratch detection, and the device is characterized in that multiple paths of annular light sources are configured, time-sharing exposure and continuous acquisition are carried out, and a multi-modal image is determined; setting a detection constraint condition; constructing a scratch detection module; identifying a multi-modal image, executing morphological processing and self-adaptive binarization processing of a grayscale image, performing multi-modal superposition fusion and scratch feature identification, and integrating and outputting a scratch detection list; and carrying out homologous induction marking, and carrying out visualization on a terminal display interface. The technical problems that existing vehicle paint surface scratch detection is limited to single-mode image acquisition and processing, tiny scratches and deep scratches on a vehicle paint surface are difficult to comprehensively capture, the detection efficiency is low, and the accuracy of a detection result is poor are solved, and the technical effect of improving the vehicle paint surface scratch detection efficiency and accuracy is achieved.

The invention provides a ship weld joint stress deduction and fatigue damage evaluation method and system, and the method comprises the steps: firstly building a finite element model of a container ship, calculating the inherent frequency of the finite element model and a corresponding vibration mode through employing a Lanczos algorithm, and forming a plurality of free vibration modes of the finite element model; the inherent frequency of each free vibration mode is compared with a preset frequency range, and the free vibration mode in the preset frequency range is reserved and serves as a basic mode; calculating a theoretical stress distribution field of the whole ship structure in each basic mode based on the vibration mode through a strain-displacement relation equation and a material constitutive equation, arranging a plurality of stress monitoring points and weld joint evaluation points, and performing inversion by adopting a mode superposition method to obtain stress values of the weld joint evaluation points; and finally, calculating a total fatigue damage value by adopting a rain flow counting method and combining a fatigue evaluation method, and evaluating whether the total fatigue damage value is reliable or not, thereby facilitating the realization of long-term fatigue life management of the welding seam area.

The invention relates to the field of mechanical engineering, in particular to a hydraulic-structure collaborative optimization design method for a shield pump, and aims to solve the problems of load distortion and structure matching imbalance caused by traditional staged optimization. The method comprises the following steps: constructing a fluid-solid bidirectional coupling simulation model, and extracting transient hydraulic loads under multiple working conditions; establishing a structure dynamic response agent model based on modal superposition and Gaussian process regression; key coupling parameters such as the impeller outlet width and the volute base circle diameter are recognized through a Sobol method; and the efficiency, the lift fluctuation rate, the stress and the vibration are taken as multiple targets, and a Pareto optimal solution is searched through an improved genetic algorithm. Manufacturing constraints are embedded in the optimization process, the single period is shorter than 48 hours, and fatigue life evaluation and knowledge base intelligent recommendation are supported. According to the method, closed-loop cooperation of hydraulic excitation and structural response is achieved, the vibration prediction error is lower than 10%, the optimization dimension is compressed to be within 5 dimensions, the efficiency is improved by 20 times or above, and the performance reliability and the design intelligence level of the shield pump are remarkably improved.

The invention discloses a liquid-filled rotor stability analysis and transient calculation method based on multi-frequency vortex decomposition, and the method comprises the implementation steps: 1) building a dual-rotor finite element model, obtaining an uncoupled fluid cross stiffness state space, and calculating a characteristic value corresponding to each order mode of a system; 2) on the basis of a multi-frequency vortex hypothesis, calculating the fluid cross stiffness under the characteristic value corresponding to each order modal of the system step by step, coupling the fluid cross stiffness into a system state space equation, and carrying out iterative calculation to obtain the characteristic value of each order convergence of the system under the influence of the liquid-solid coupling effect; 3) calculating the liquid exciting force of each order mode based on the convergent system characteristic value, and decomposing the total displacement response of the system into each order mode of the system based on a mode superposition principle; and 4) carrying out transient dynamic solution analysis on the rotor dynamic model after liquid-solid coupling in combination with an explicit-implicit separation solution frame order-by-order mode. The method solves the problem that in a traditional liquid-solid coupling rotor stability analysis method, a traditional concentrated mass model can only process single vortex motion frequency.

The invention discloses a transfer case vibration simulation analysis optimization method and device, and the method comprises the steps: building a transfer case finite element model, simulating each bearing of a transfer case shaft gear, and obtaining a bearing dynamic load; acquiring the inherent frequency and the inherent vibration mode of the first ten orders of the transfer case shell, inputting variable parameters into the finite element model of the shell, and performing simulation solution analysis on the frequency response of the box body through a modal superposition method; establishing parameter sample data points and level numbers on the basis of variable parameters, generating an orthogonal test table, and respectively performing an independent simulation test on each parameter group to obtain an average torque and a vibration acceleration level corresponding to each parameter group; the variable parameters serve as target parameters, a neural network prediction model is established to optimize the multi-target parameters, and an optimal solution set with the maximum average torque and the minimum vibration acceleration level is obtained through iterative operation; optimization is carried out through simulation analysis so as to reduce or avoid vibration, data support is provided for rack construction of a transfer case high-speed verification test, test problems are reduced, and test working efficiency is improved.

A bridge response reconstruction method based on main contribution mode superposition comprises the following steps: firstly, testing a bridge influence line, firstly obtaining a deflection influence line of a bridge, calculating a rigidity distribution function of the bridge through the deflection influence line, and then obtaining a vibration mode matrix of the bridge through a characteristic value method by combining a quality function obtained by a bridge design drawing. And analyzing the order of the main contribution mode by using the responded singular value spectrum, obtaining the vibration mode of the main contribution mode in combination with the vibration mode matrix, and substituting the measurement point vibration mode of the main contribution mode into a measurement point bridge response calculation formula based on mode superposition to obtain modal response. And substituting the vibration mode of the unmeasured area of the main contribution mode and the modal response into a bridge response calculation formula based on modal superposition, and reconstructing the response of the unmeasured area of the bridge. In the bridge unmeasured area response reconstruction theory, the error between the modal shape obtained by the finite element model and the actual modal shape is solved, and the precision of the modal response and the reconstruction response of the unmeasured area is improved.

The invention provides a temperature field reconstruction method and system based on digital twinning and application thereof, and the method comprises the steps: obtaining multi-moment temperature field data of target equipment, and carrying out the spatial dimension reduction processing, and obtaining K dominant modes; based on the multi-moment temperature field data and the K dominant modes, calculating modal coefficients of the temperature field at each moment in each dominant mode, and forming modal coefficient time sequences in one-to-one correspondence with the dominant modes; training a time sequence prediction model based on the modal coefficient time sequence and the operation condition physical parameters of the target equipment in time alignment with the modal coefficient time sequence, and predicting an initial modal coefficient at a future moment by using the time sequence prediction model; performing feedback correction on the initial modal coefficient based on a correction mechanism to obtain a corrected modal coefficient; and reconstructing the temperature field of the target equipment by using the corrected modal coefficient and the K dominant modals. According to the method, through a technical chain of space dimension reduction, working condition fusion, feedback correction and modal superposition, high calculation efficiency and high full-field reconstruction precision are both considered.

The invention discloses a multi-split conductor icing characteristic test device and a torsional rigidity design method thereof. The device comprises two supporting frames and a plurality of multi-split conductor segments arranged between the two supporting frames. The conduction direction of the tension of the horizontal spring is changed through the string, so that the torsional rigidity of the multi-split conductor icing characteristic test device is kept constant during large-angle torsion, and the device can be used for the large-angle torsion icing characteristic test of the multi-split conductor; according to the torsional rigidity design method, on the basis of a modal superposition method and a dynamic similarity criterion, all physical parameters of the multi-bundle conductor icing characteristic test device are obtained, and accurate design of the torsional rigidity of the multi-bundle conductor icing characteristic test device is achieved by adopting different horizontal spring rigidity and torque loading disc radius combinations; and the icing characteristic of any position of any real multi-split conductor can be accurately simulated.

The invention discloses a bidirectional fluid-solid coupling CFD and modal superposition ship water elasticity acquisition method and device, computer equipment and a storage medium, and relates to the technical field of ship water elasticity, in particular to the technical field of bidirectional fluid-solid coupling CFD and modal superposition ship water elasticity. The ship water elasticity acquisition method comprises the following steps: S1, establishing a rigid ship body drainage basin model of a target ship in a CFD solver, and performing grid discretization and physical condition setting; s2, establishing an elastic hull structure model in an FEM solver, and performing grid discretization and boundary constraint setting; s3, constructing a bidirectional coupling matching method, and associating grid information of the drainage basin model with grid information of the structure model; s4, performing numerical simulation on a coupling result to obtain a hull surface pressure field; and S5, transmitting the pressure field to the structure model, calculating a motion equation, and obtaining real-time response data reflecting water elasticity. The method is suitable for the fields of ship design, ocean engineering, water surface transportation and the like.

The invention provides a large truss vibration control controlled mode selection method based on optical performance indexes, which comprises the following steps of: 1, establishing a finite element model of a large truss structure, and performing mode analysis on the large truss structure to obtain mode information of vibration of the large truss structure; 2, a linear system of the large truss structure is built through a modal superposition method; 3, calculating the dynamic response of the large truss structure under the required working condition, and obtaining the size of each order of modality under the required working condition; step 4, according to the position of the optical measurement point, establishing a calculation expression of the optical performance index under the physical coordinate, and performing quadratic form fitting; and 5, calculating the modal value of each order of modal to each optical index under the required working condition, and carrying out sorting and screening according to the modal value. According to the invention, the problem of effective mode loss caused by a traditional mode truncation method is solved.

The invention provides an assembly deviation prediction method considering surface macro and micro characteristics and assembly deformation. Comprising the steps of part surface macro-micro feature representation based on primary function modal superposition, non-ideal surface model construction considering an actual machining surface, and non-ideal surface contact state calculation based on a difference plane and point cloud registration method. And solving non-ideal surface contact deformation based on a conjugate gradient-fast Fourier algorithm and establishing an assembly deviation transfer model considering surface macro and micro characteristics and assembly deformation. According to the method, surface form and position errors generated by part machining errors and assembly deformation errors caused by loads in the assembly process are fully considered, the deviation domain model and the Minkowski summation method are combined to simulate transmission of the assembly deviation, the prediction precision of the product assembly deviation is effectively improved, and meanwhile the operation speed is remarkably increased; and real-time monitoring and timely deviation adjustment in the assembling process are achieved.

This invention belongs to the field of simulation correction technology and discloses a finite element simulation correction method and system for the vibration response of a structure excited by turbulent boundary layer. The method includes: obtaining a turbulent cross-spectral expression as input based on CFD calculations or a classical turbulent cross-spectral model; obtaining analytical results of the vibration displacement, velocity, or acceleration response based on the theoretical model of the vibration response of an elastic plate under turbulent boundary layer excitation using the modal superposition method; obtaining numerical results of the vibration displacement, velocity, or acceleration response based on the spatial discretization of the elastic plate and the numerical model of the plate vibration response under turbulent boundary layer excitation; subtracting the analytical results from the numerical results at the corresponding frequencies to obtain a correction amount for the finite element simulation results of the vibration response of the structure excited by turbulent boundary layer; and subtracting the correction amount from the finite element simulation results of the displacement, velocity, or acceleration response of the turbulent-excited structure to obtain the final correct structural response result.

The application discloses a kind of multi-point excited time domain load identification method, using modal superposition method to carry out the transient dynamics response analysis of engineering equipment structure, respectively on each excitation load degree of freedom, obtain the time history response of all expected response degrees of freedom;In frequency domain, construct the transmission relationship between the external excitation load degree of freedom and the expected response degree of freedom, respectively Fourier transform is carried out to all the applied external excitation load and the obtained dynamics response, then construct transfer function at each frequency point;According to the expected dynamics response, construct appropriate external excitation load, Fourier transform is carried out to all the expected dynamics response, according to the constructed transfer function, calculate the external excitation load at each frequency point in frequency domain;Finally, using inverse Fourier transform converts the external excitation load in frequency domain to time domain;The application can solve the ill-posed problem of time domain load identification, and also can provide important support for dynamics control under different dynamic load environment.

The embodiment of the invention provides a hydrogen fuel flow simulation CFD post-processing method, device, equipment and medium, and relates to the technical field of numerical simulation, and the method is realized through the following steps: executing hydrogen fuel flow CFD simulation based on an aero-engine, and generating unstructured grid data; converting the unstructured grid data into a plurality of simulation result files, sorting grid geometric information and numerical value distribution data in the simulation result files, generating a time snapshot matrix, calculating an adjoint matrix S through the time snapshot matrix, and then obtaining a mode corresponding to each feature vector of the hydrogen fuel flow field; and through a mode corresponding to each feature vector of the hydrogen fuel flow field, calculating to obtain a magnification gi and a mode coefficient amplitude ba, and carrying out dynamic reconstruction and prediction on the hydrogen fuel flow field through a mode superposition method. According to the scheme, the flow field state at any moment can be reconstructed and predicted through a modal superposition method, and the post-processing efficiency is improved.

The present invention provides a dense modal response reconstruction method based on a state transfer matrix, belonging to the field of structural response reconstruction, and comprising the following steps: S1, decomposing each order modal response, separating the initial phase from the initial amplitude in the response, and expressing each order modal response in matrix form; S2, constructing the state matrices of the measured point and the point to be reconstructed, respectively, and obtaining the modal mode ratio matrix of the measured point and the point to be reconstructed; S3, constructing the state transfer matrix between the point to be reconstructed and the measured point; S4, reconstructing the response of the point to be reconstructed according to the state transfer matrix. The dense modal response reconstruction method based on a state transfer matrix proposed by the present invention, based on the modal superposition method of linear systems, separates the initial phase from the initial matrix in the modal response, and reconstructs the response according to the state transfer matrix between the point to be reconstructed and the measured point. This method can handle the response reconstruction of structures with dense modal characteristics and ensure the accuracy of the response reconstruction.

The invention provides an underwater ribbed cylindrical shell sound radiation prediction method and system based on parametric modeling, and the method comprises the following steps: (1) constructing a parametric shell model, and determining geometric parameters, material parameters, rib parameters and fluid parameters; (2) establishing a vibration control equation on the basis of a Donnell-Mushtari shell theory; (3) solving a frequency domain vibration response by adopting a modal superposition method, and calculating a modal amplitude; (4) calculating a sound radiation field based on a Helmholtz integral equation, acquiring near-field sound pressure through numerical integration, and acquiring far-field sound pressure by adopting a modal expansion method; and (5) changing the shell thickness and the excitation amplitude ratio F2 / F1 by optimizing structural parameters and excitation configuration, and observing and analyzing the distribution condition of near-distance radiation noise and the amplitude change condition of a main peak of a long-distance radiation noise level frequency response curve. The calculation method is simple, the real-time analysis effect is good, and technical support can be provided for vibration radiation noise analysis and low-noise structure design of an underwater operation platform and a pipeline structure.

The invention provides a method for analyzing the damage of a hidden part of a track structure after train derailment caused by an earthquake, and relates to the field of dynamic response analysis of track structures. The method comprises the following steps: establishing a track substructure model, sequentially establishing track substructures such as a steel rail, a fastener system, a track plate, a filling layer and a base plate from top to bottom, and introducing cohesion unit simulation between structural layers, according to the earthquake load simulation, earthquake waves are transmitted to the structural non-supporting point freedom degree through the structural supporting point freedom degree, and then the whole vehicle system is influenced. According to the method, the accuracy and the calculation efficiency of dynamic response analysis of a track structure under the earthquake action are remarkably improved by introducing an improved nonlinear elastic theory and a multi-point non-Hertz contact model and combining a modal superposition method and a multi-scale analysis method in consideration of a vehicle-track complex collision contact behavior after derailment.

The application discloses a structural seismic response calculation method based on a dynamic guidance support vector machine, which comprises the following steps: a finite element model is established to extract structural dynamic characteristics; in combination with the structural dynamic characteristics, a single degree of freedom system motion equation is used as a constraint condition to optimize an objective function, and parameter optimization of a prediction model is realized; an LS-SVM algorithm is adopted to input structural characteristics and ground motion, and to output response quantities such as displacement and velocity, so as to construct a PDLS-SVM model; a modal decomposition method is used to decouple a multi-degree of freedom system, and a dynamic equation and a modal superposition principle are used to construct a seismic response prediction model; and based on a linear interpolation recursive formula, the performance of the seismic response prediction model of the structure is verified, and performance evaluation indexes are obtained; the application uses structural dynamic equations and physical laws as a basis, and considers structural dynamic characteristics to construct a data-independent seismic prediction model, so that the shortcomings of traditional methods and machine learning methods are overcome, and the calculation efficiency and accuracy are improved.

The invention discloses a composite vibration response analysis method under the combined action of basic excitation and nodal force excitation, and the method comprises the steps: applying a basic vibration load spectrum to a basic load action position, and carrying out the dynamics calculation of an equipment structure under the basic vibration load spectrum based on a modal superposition method, obtaining a basic excitation response under the basic vibration load spectrum; applying the node force load spectrum to the node force load action node, and carrying out dynamics calculation under the node force load spectrum on the equipment structure based on a modal superposition method to obtain a node force excitation response of the equipment structure under the node force load spectrum; performing superposition calculation on the basic excitation response and the node force excitation response by using a composite response superposition method to obtain a composite vibration response of the equipment structure; reliable composite vibration response of the equipment is obtained through numerical analysis, the reliability of environmental adaptability analysis and evaluation of the airborne precision equipment is improved, and the research and development risk of the precision equipment is effectively reduced.

A rocket system level structure vibration simulation and verification method, comprising: constructing a rocket system level structure finite element model based on modal superposition method, carrying out harmonic response analysis, constructing excitation-response transfer function in frequency domain, and determining dynamic load transfer path and amplification effect; combining the power spectral density of the rocket vibration environment, implementing random vibration analysis, quantifying the system level structure strength safety margin by calculating the fatigue life; selecting weak components or typical components to carry out targeted vibration test, and verifying the reliability of the system level vibration simulation method in the above steps through test data. The method can effectively improve the vibration environment prediction accuracy and structure design reliability.

This invention relates to a data processing method and storage medium for ice-elastic plate compression tests in the field of ship structural mechanics. The method includes the following steps: performing a compression test by compressing an ice sample with an elastic plate; after the compression test, obtaining the test pressure value and strain gauge test values ​​of the ice sample under compression; selecting a preset order mode shape using the modal superposition method to obtain a fitted deflection function; determining the fitted strain value corresponding to each test point of the elastic plate based on the fitted deflection function; calculating the time coefficient by combining the strain gauge test values ​​and the fitted strain values ​​using the least squares method to obtain the fitted deflection distribution function of the elastic plate; and calculating the compression energy of the elastic plate and the ice sample based on the fitted deflection distribution function and the test pressure value. This method focuses on the deformation of the elastic plate to explore the interaction between ice and the structure from an energy perspective, considering the feedback influence of structural deformation on the action process, thus forming a universal method for predicting ice loads.

The invention discloses an FE-VFIFE hybrid calculation method for nonlinear dynamic analysis of a complex structure, which is suitable for the fields of seismic engineering, ocean engineering and the like which require real-time simulation and analysis of the complex structure, the FE and the VFIFE are combined, dimension reduction of each linear substructure is realized through a modal superposition method in a conventional finite element, and the nonlinear dynamic analysis of the complex structure is realized. The whole system is decoupled into a series of modal equations, and the calculation amount is reduced; vector type finite elements are used for calculating the internal force of the nonlinear part, the situation that a global stiffness matrix is repeatedly updated in the calculation process is avoided, meanwhile, a Chang method is adopted for unconditional stable integration, and mass and damping correction factors are introduced to improve the calculation precision, increase the integration step length and improve the calculation efficiency. The method can be efficiently applied to real-time hybrid simulation of the local nonlinear problem of a complex structure system, and powerful support is provided for performance evaluation and design optimization of the complex structure under the action of complex dynamic loads such as earthquakes and marine environments.

The present invention provides a method for calculating the nonlinear dynamic characteristics of a pressurized water reactor fuel assembly, which belongs to the field of nuclear power technology, and includes: obtaining the boundary conditions of a grid when it is not slipping and when it is slipping; modeling to obtain the control equation of the grid; solving the control equation of the grid to obtain the bending moment of one end of the grid to the guide tube; constructing the dynamic equation of the guide tube; using the modal superposition method to obtain the first discrete linear equation group; calculating the quasi-static loading response of the pressurized water reactor fuel assembly; discretizing the dynamic equation of the pressurized water reactor fuel assembly to obtain the second discrete linear equation group; solving the second discrete linear equation group to obtain the dynamic response of the pressurized water reactor fuel assembly. The present invention solves the problem of high-precision nonlinear dynamic modeling of fuel assemblies.

The invention discloses a gear transmission system local nonlinearity rapid analysis method, and relates to the field of gear transmission system dynamics calculation, and the method comprises the following steps: taking a bearing of a gear transmission system as a linear elastic support, and constructing a dynamics equation of the gear transmission system; a linear part and a non-linear part in a gear transmission system are separated by utilizing a non-linear interface separation technology; performing model polycondensation dimension reduction on a linear part in the gear transmission system, and calculating a nonlinear load and a comprehensive equivalent load on a nonlinear part; and for the kinetic equation after polycondensation and dimension reduction, performing numerical iteration solution by using a Newmark-beta method to obtain the kinetic response of the gear transmission system. The method has the remarkable static deformation characteristic, is very suitable for dynamic solution of the gear transmission system, meets the precision requirement by utilizing a lower truncation order, is higher in calculation efficiency compared with a traditional modal superposition method, and can serve service performance evaluation of the gear transmission system in major equipment.

The invention discloses a structure nonlinear dynamic response incremental modal overlay analysis method and system, and belongs to the field of aerospace structure dynamics calculation. The method comprises the steps of constructing a finite element model and obtaining an initial matrix; dispersing the time-varying temperature field into a plurality of time increment intervals, updating material parameters in each interval, and calculating an instantaneous matrix; carrying out eigenvalue analysis and converting the kinetic equation into a modal coordinate system; solving a modal response increment by adopting a numerical integration method and converting the modal response increment to a physical coordinate system for superposition; and circularly executing until a full-time-history response is output. According to the method, the problem of rigidity nonlinearity caused by the temperature is solved through incremental linearization and modal order reduction, high calculation precision and high efficiency are achieved, and the method is suitable for dynamic design and analysis of aerospace structures in the high-temperature variable-temperature environment.

The invention relates to the technical field of material parameter identification, and provides a material parameter identification method and system for a 3D printing structure, and the method comprises the following steps: S1, obtaining a three-dimensional model of a to-be-detected structure; s2, giving initial material parameters to the three-dimensional model, and performing finite element modal analysis on the three-dimensional model to obtain a multi-order modal shape; s3, obtaining a structural vibration sensitive area on the three-dimensional model according to the multi-order modal shape; s4, enabling the structure vibration sensitive area to correspond to the to-be-detected structure, and forming a detection area. According to the material parameter identification method and system of the 3D printing structure, the vibration test result of the structure is combined with the finite element analysis result of the structure according to the modal superposition attribute of the structure vibration, the material parameters of the 3D printing structure are identified by adopting an optimization method, and the method and system are not influenced by the change of the material parameters of the 3D printing structure; and material parameter identification can be directly carried out on the structure after 3D printing forming.

The present application relates to a kind of wave environment under suspended tunnel dynamic response frequency domain calculation method, belong to the field of tunnel structure.Based on classical dynamics theory, the elastic foundation beam simplification of pipe body with discrete anchor is carried out, the motion control equation of suspended tunnel is established using Hamilton principle, the wave force on suspended tunnel pipe body is calculated by potential flow theory and combined with boundary element numerical calculation method, finally the dynamic response of suspended tunnel is obtained by solving wave-solid coupling equation using modal superposition method.Based on potential flow theory, the accuracy and efficiency of the solution can be focused on simultaneously, it is suitable for large-scale structure, and the combination of elastic foundation beam model makes the calculation of wave-solid coupling not consume too much computing resources, comprehensive multi-parameter multi-condition analysis is carried out on the structure, the coupling effect of pipe body horizontal displacement and torsional displacement is considered, compared with the previous method, the calculation of the situation that pipe body appears larger horizontal displacement or torsional displacement will be more accurate.

The invention provides a reduced-order galloping analysis method based on intelligent mode selection, and belongs to the technical field of electric power operation and maintenance, and the method comprises the steps: building a digital model of a power transmission conductor, and representing the geometric configuration of the conductor; performing finite element modal analysis on the digital model to obtain a multi-order vibration modal vector of the conductor; implementing intelligent modal screening; quantifying key point displacement characteristics for each order of modal; constructing a modal feature vector, inputting the modal feature vector into the trained convolutional neural network for modal classification and dominant evaluation, and screening out a dominant modal set; performing mode superposition by using modes in the dominant mode set, and describing vertical vibration displacement and out-of-plane vibration displacement of the wire; and constructing a reduced-order kinetic energy and potential energy expression based on the dominant mode set, and obtaining a dimensionality-reduced kinetic model for solving. The method has the advantages that only key modals are reserved through the intelligent screening technology, the dimensionality of a kinetic equation is reduced, simulation analysis is converted into rapid completion from traditional long-time calculation, and the analysis period is shortened.

The invention discloses an electrically-driven sound transfer function calculation method based on space order force, a noise standard exceeding analysis method, equipment and a storage medium, unit exciting force is applied to a motor stator tooth part to simulate an electromagnetic force space force type, and the method is used for analyzing the influence of space order force such as 0 and 8 on noise. Response curves, namely sound transfer function curves, of different electric drives under unit excitation are obtained through calculation with a modal superposition method; the same unit excitation is applied to different electric drives, the main reason for noise exceeding can be analyzed by comparing the acoustic transfer function curves of the electric drives, and support is provided for subsequent optimization of electromagnetic force or electric drive structures.