37 results about "Transient response analysis" patented technology

A method for predicting seismic safety for extremely large engineering project includes using finite element (FE) preprocessing software to set up FE module, inputting parameters required by active time histories of seism for obtaining mathematical module, transmitting the model and time step length to supercomputer to carry out transient response analysis and model analysis for parallel calculation, sending data back to FE analysis software for following calculation and carry out visual processing by using FE post processing software to read in calculation result .

The invention discloses a main shaft-knife handle joint surface nonlinear dynamic characteristic parameter identification method. A main shaft-knife handle joint surface nonlinear dynamic characteristic parameter is identified based on a non-parametric method which is combined with finite element analysis technology. Particularly, a finite element analysis model of a main shaft-knife handle system is firstly set up, nonlinear transient response analysis is performed on the model, and transient response of displacement, speed and accelerated speed at a joint surface is obtained. Time history data of nonlinear contact force at the joint surface are deduced and obtained based on the Newton second law of motion, regression analysis is performed on the sampled data based on a non-parametric method by utilizing a least square method and a Chebyshev polynomial, and an analysis and expression model of radial and tangential non-linear contact force of the main shaft-knife handle joint surface is finally obtained. The non-linear contact force model can be directly applied to dynamics modeling of a main shaft-HSK knife handle system, and necessary conditions for further studying whole dynamic characteristics of the main shaft-HSK knife handle system are provided.

The dynamic measurement time domain compensation method includes approximating the measured parameter curve into sectional broken lines and recursion calculation to obtain measured parameter based onthe kick point and slope of the broken lines. In determining the kick point and slope of a broken line, the discreet value of sensor output is calculated through analysis and recursion based on the instantaneous response of inertial link, the broken line model is then determined dynamically based the difference between the discreet value and the practical value, and the broken line signal value is finally calculated through recursion calculation based on the broken line model. The said method can raise the dynamic measurement response speed and precision, and the simple time domain recursion algorithm is simple, timely, suitable for realizing with microcomputer assemble language, low in cost, flexible and intelligent, and is suitable for measurement of various physical quantities with sensor being inertial link.

The invention relates to a rotor unbalancedness identification method based on calculation of a reverse seeking technology. The method includes the steps that the amount of unbalanced force to be identified is determined according to a rotor structure which dynamic balance is to be conducted on; unbalanced force is added to a transient response analysis model, a response displacement and response measuring points relevant to a force application point are found out, and a corresponding dynamic response is obtained through experimental measurement; a kernel function response from a load action point to the response measuring point is calculated through a simulation method by means of the rotor system structure and assumed unit impulsive force, and a kernel function matrix is established and corrected; based on the obtained dynamic response and the corrected kernel function matrix, unbalanced force is obtained by solving the module of regularized functional minimum residual error, the amplitude and phase of the amount of unbalance are obtained, and dynamic balance processing is carried out on the rotor system structure accordingly. The unbalancedness of a rotor can be quickly obtained only through an experiment and several measuring points, dynamic loads difficult to determine through some traditional methods can be obtained accurately and effectively, and the number of times of physical experiments and cost are greatly reduced.

The invention provides a thin-wall structure thermodynamic elastic dynamic response analysis method, which comprises the following steps: according to a thin-wall structure and boundary conditions, dispersing the thin-wall structure into seven-degree-of-freedom shell units, dispersing ribs into seven-degree-of-freedom beam units, and establishing a thin-wall finite element model to obtain a structure finite element grid; applying a thin-wall structure temperature field to the structure finite element grid, performing linear flutter analysis on the finite element model to obtain an unsteady aerodynamic matrix Qk corresponding to each reduction frequency k, and fitting a time domain expression of the unsteady aerodynamic matrix; and carrying out iterative calculation on the obtained time domain expression of the unsteady aerodynamic matrix, and carrying out nonlinear transient response analysis on the thin wall to obtain the nonlinear thermodynamic elastic dynamic response of the thin wall structure. The method provided by the invention can solve the calculation problem of the nonlinear thermodynamic elastic dynamic response of a complex thin-wall structure.

The invention belongs to the technical field of structural dynamics and finite element simulation and particularly relates to a dynamic load nonlinear analysis method for a flexible solar cell wing. The invention discloses the following technologies: 1, a finite element modeling method of tensioning mechanisms, a guide mechanism and hanging steel wire ropes of the flexible cell wing; 2, a method for applying a pre-tightening force of the tensioning mechanisms and the guide mechanism in the nonlinear transient response analysis process; 3, simulation of a mechanical property that the hanging steel wire ropes only can bear a pulling force and cannot be pressed in the NASTRAN solving process; 4, a method for improving nonlinear iteration convergence by compensating difference in lengths of the hanging steel wire ropes, which is caused by deformation of storage boxes; and 5, a nonlinear transient response analysis technology under the combined action of a static pre-tightening force and a dynamic inertial force. The dynamic load nonlinear analysis method for the flexible solar cell wing has the beneficial effects of simple method and ingenious design.

A multi-response surface method for calculating vibration reliability of a mistuned bladed disk comprises the following specific steps: simulating mistuning of the bladed disk by changing elasticity modulus of various blades, and determining the factor which affect vibration reliability of the bladed disk; analyzing structural load in the influence factor; carrying out vibration mode analysis andtransient response analysis on the bladed disk under the influence of structural load, and acquiring basic parameters for analysis of the vibration reliability of the bladed disk; constructing a multi-response surface method mathematical model for analysis of the vibration reliability of the mistuned bladed disk; analyzing the vibration reliability of the bladed disk by using the multi-response surface method; and verifying effectiveness of the multi-response surface method. The method is high in calculating speed and high in precision, can visually show change relation of output response, andprovides a new way for analysis of reliability engineering.

A rotary machine diagnostic system includes: a current measurement unit for measuring a leakage current of a rotary machine; a voltage measurement unit for measuring a voltage of the rotary machine corresponding to the flowing leakage current; and a data processing unit. The data processing unit has a function of performing transient response analysis on a predetermined equivalent circuit model, which is equivalent to a leakage current path of the rotary machine, using current data and voltage data having a predetermined time width which are respectively measured at predetermined time intervals by the current measurement unit and the voltage measurement unit, and a function of extracting parameters of the equivalent circuit of the leakage current path.

The present invention discloses a carrier transient response indication method based on a star satellite load couple analysis result. The method comprises the following steps of taking carrier or satellite interface time domain acceleration data obtained in the star satellite load couple analysis process as an agreed boundary between the carrier and the satellite in a certain research stage and loading the data to a carrier or satellite docking point in a combined body physical model of the carrier and effective load in a forced acceleration manner, and performing transient response analysis and calculation on the combined body physical model so as to obtain desired carrier or an effective load interface and response data of internal nodes of the carrier. According to the carrier transient response indication method based on the star satellite load couple analysis result, the large difference between boundary impedance and actual flying condition of the frequency response analysis method in response indication is prevented, and calculation number of times are not limited by whole satellite load couple analysis number of times, so that the local improvement effect of the carrier structure can be indicated and evaluated.

Wellbore wireless thermal conductivity quartz transducer comprising a thermal conductivity quartz transducer and a wireless communication system comprising an external device and an internal device, a cable, and a surface device. The thermal conductivity quartz transducer comprises a first quartz resonator, a heat dissipation element, a second quartz resonator, an electronics circuit and heat guiding means arranged for transferring a heat generated by said electronics circuit to said heat dissipation element, so that said dissipation temperature is higher than said ambient temperature. The invention is also a method for wirelessly performing transient response analysis of a formation in a wellbore with such transducer.

The invention relates to the technical field of dynamic tests and provides a virtual test-based strain sensor optimized layout method. The method comprises steps that a Delta function is employed to represent the existence of a strain sensor; an applied impact load work point can move in random and a transient response analysis is conducted; sensor total minimization and impact response strain total 2-norm maximization are designated to be an optimization target; and a genetic optimization algorithm is applied and a strain sensor optimal layout scheme can be achieved. The beneficial effects are that the Delta function is used for representing the existence of the strain sensor, which is practical; based on the genetic algorithm, the impact load work point can move in random between skin nodes, so the strain sensor optimized layout result has universality; the optimization target is simple and easy to define and describe; and at least one half of sensors can be saved compared with traditional sensor layout numbers.

The invention relates to the field of transient response analysis of porous elastic media, in particular to a thermal fluid-solid coupling transient response calculation method and device for a porouselastic medium. The method comprises the following steps: acquiring relevant parameters of the porous elastic medium; establishing a thermal fluid-solid coupling form of the porous elastic medium according to the relevant parameters of the porous elastic medium; constructing a form of a single-layer porous elastic medium solution on a Laplace domain or a form of a solution on any layer of a multi-layer porous elastic medium based on an eigenvalue theory and a Stroh-like method; obtaining a general solution of each physical quantity Laplace domain of the porous elastic medium based on a propagation matrix method, and determining a special solution of each physical quantity Laplace domain according to boundary conditions; and obtaining the thermal fluid-solid coupling transient response ofthe porous elastic medium based on a Laplace numerical inverse transformation method. The thermal-fluid-solid coupling transient response of the elastic medium is solved by adopting an analytical method, so that the calculation amount can be reduced, and the calculation speed can be increased.

The embodiment of the invention discloses a STATCOM transient response analysis system and method based on a fault recording file, and the system comprises a basic data module which comprises a STATCOM process database, a recording database, and a report database; a data interface module which is used for importing a fault recording file of an STATCOM transient response state formed when the STATCOM responds to the power grid requirement and reactive compensation action occurs, extracting effective current and voltage data in the fault recording file and storing the effective current and voltage data in a recording database in the basic data module; a business model module which is used for integrating a mathematical algorithm library, a dynamic rule library and an expert rule library dataprocessing module. According to a rule base of the business model module and data provided by the basic data module, comprehensive evaluation analysis is carried out on a corresponding result of theSTATCOM transient response, automatic analysis and analysis algorithm discretization are carried out based on a power system fault recording file, automatic calculation is carried out through a PC, the analysis speed is high, the precision is high, and the analysis precision reaches the millisecond level.

The invention discloses an oil tank fluid-solid coupling transient analysis method and system considering liquid additional mass, and relates to the field of automobiles. The method comprises the following steps: mapping the node displacement of a previous moment point to an established fluid model, and with the node displacement of the previous moment point as an input boundary, performing fluidcalculation on the fluid model at the current moment to obtain the dynamic pressure and the total pressure of the fluid on the wall of the oil tank at the current moment; mapping the total pressure and the liquid additional mass at the current moment point to the established structural finite element model; performing transient response analysis on the structural finite element model to obtain node displacement, acceleration and stress of grid nodes of the structural finite element model at the current moment; and performing fatigue calculation based on the stresses of the grid nodes at all the time points. The structural fatigue of the oil tank, caused by liquid shaking, can be accurately simulated.

Wellbore wireless thermal conductivity quartz transducer comprising a thermal conductivity quartz transducer and a wireless communication system comprising an external device and an internal device, a cable, and a surface device. The thermal conductivity quartz transducer comprises a first quartz resonator, a heat dissipation element, a second quartz resonator, an electronics circuit and heat guiding means arranged for transferring a heat generated by said electronics circuit to said heat dissipation element, so that said dissipation temperature is higher than said ambient temperature. The invention is also a method for wirelessly performing transient response analysis of a formation in a wellbore with such transducer.

A computer-executed method for determining the earthquake safety prediction of a super-large project in the field of computer technology, using finite element pre-processing software to establish a finite element model, and inputting the parameters required for the time history of earthquake motion; the parameters are transferred to a supercomputer, and artificial earthquake motion is used to The time-history parallel simulation hybrid task assignment method is used to obtain the seismic excitation dynamic time history; the seismic excitation dynamic time history is returned to the finite element pre-processing software for constraint loading, and the task file of the finite element analysis software is obtained and submitted to the finite element analysis software to obtain The mathematical model, the mathematical model and the time step are transferred to the supercomputer, and the parallel processing method of transient response analysis and modal analysis or the parallel processing method of modal analysis is used for parallel calculation; the data is returned to the finite element analysis software for subsequent calculation; limited The meta-post-processing software reads in the calculation results and performs visual processing. The present invention is realized by means of software, which greatly saves manpower, material resources and financial resources for system implementation.

The invention provides an evaluation method of an auxiliary information delay effect in a GNSS / INS deep combination. The method comprises the following steps: (1) establishing the INS auxiliary tracking loop mathematical model of a Laplace domain according to the principle structure of an INS auxiliary tracking loop, (2) according to the INS auxiliary tracking loop mathematical model, establishing the error transmission model between INS auxiliary delay and a loop tracking error, (3) transmitting the error transmission model into a time domain, using a transient response analysis method to simulate the change of the loop tracking error brought by the INS auxiliary delay of the INS auxiliary tracking loop under a dynamic excitation signal. The method can be used for evaluating the effect of the auxiliary information delay to the INS auxiliary GNSS tracking loop performance, and thus the real-time performance design and tracking loop optimization in GNSS / INS deep combination system development are guided.

The invention relates to a passenger car lower swing arm transient fatigue analysis method and device, and relates to the technical field of fatigue calculation. The passenger car lower swing arm transient fatigue analysis method comprises the steps of firstly decomposing a lower swing arm load, calculating and obtaining a lower swing arm connection point load spectrum in combination with wheel center six-component data, then calculating and obtaining modal coordinates of the lower swing arm by using the lower swing arm connection point load spectrum, establishing a finite element mesh model of the lower swing arm according to a three-dimensional model of the lower swing arm, calculating the modal stress of the lower swing arm; utilizing the modal stress and the modal coordinates to calculate the transient stress of the lower swing arm, and finally calculating the fatigue life of the lower swing arm based on the transient stress. According to the passenger car lower swing arm transient fatigue analysis method and device, the modal coordinates of the lower swing arm are obtained through transient response analysis, then the transient stress is obtained by combining the modal stress, then the fatigue life of the lower swing arm is obtained through calculation, the calculation defect of a traditional unit load method is avoided, and the calculation result is more accurate.

This disclosure discloses a fast prediction method for the instability limit of a steam turbine rotor system based on shroud zero damping. By establishing a three-dimensional geometric model of the steam turbine rotor system, the modal analysis module and the transient response analysis module of the finite element software are used to obtain the maximum vibration of the system. The adjacent peak value of the transient displacement response of the blade is read from the displacement response curve (A 1 、A 2 ), calculate the logarithmic damping δ and damping ratio ξ of the rotor system considering the shroud friction under the rotational speed and harmonic excitation loads of each order, and quantitatively calculate the shroud damping C at different speeds s . The present invention uses the FFT multi-harmonic balance method to extend the existing modeling of the surrounding band damping considering the influence of the simple harmonic excitation and the quantitative solution method based on the envelope of the transient response to the multi-frequency excitation. The operation process is clear and the calculation is simple. It has high efficiency, provides theoretical basis and methods for the design and manufacture of steam turbine rotor system, and has important theoretical significance and engineering application value for ensuring the safe operation of steam turbines.

The invention belongs to the technical field of structural dynamics and finite element simulation and particularly relates to a dynamic load nonlinear analysis method for a flexible solar cell wing. The invention discloses the following technologies: 1, a finite element modeling method of tensioning mechanisms, a guide mechanism and hanging steel wire ropes of the flexible cell wing; 2, a method for applying a pre-tightening force of the tensioning mechanisms and the guide mechanism in the nonlinear transient response analysis process; 3, simulation of a mechanical property that the hanging steel wire ropes only can bear a pulling force and cannot be pressed in the NASTRAN solving process; 4, a method for improving nonlinear iteration convergence by compensating difference in lengths of the hanging steel wire ropes, which is caused by deformation of storage boxes; and 5, a nonlinear transient response analysis technology under the combined action of a static pre-tightening force and a dynamic inertial force. The dynamic load nonlinear analysis method for the flexible solar cell wing has the beneficial effects of simple method and ingenious design.

The present invention relates to the technical field of dynamic tests, and provides a method for optimizing the layout of strain sensors for virtual tests, including the steps of using a Delta function to represent the presence or absence of strain sensors; the point of action of the applied impact load moves randomly, and the method of performing transient response analysis Steps; and taking the minimization of the total number of sensors and the maximization of the strain sum 2-norm of the impact response as optimization goals, using a genetic optimization algorithm to obtain a better arrangement of the strain sensors. The beneficial effects of the present invention are: the Delta function is used to represent the presence or absence of the strain sensor, and the method is practical; based on the genetic algorithm, the impact load action point can be randomly moved among the skin nodes, so that the optimal arrangement result of the strain sensor is universal ; The optimization target is simple, easy to define and describe; compared with the traditional sensor arrangement, the number of sensors can be saved by at least half.

The invention discloses a simulation analysis system for the abnormal sound of automotive upholstery. The simulation analysis system comprises a modeling module, a loading module and a simulated analysis module; the modeling module is used for establishing an interior vehicle body finite element model and endowing an abnormal sound analysis object with a rigidity value; the loading module is used for respectively loading a static limit torsion working condition and a dynamic road spectrum working condition by adopting a gravity field method; and the simulated analysis module is used for performing simulation analysis to respectively obtain a limit relative displacement value and a time domain relative displacement curve of the abnormal sound analysis object under the two working conditions, and when the relative displacement at any moment under the two working conditions is smaller than the set displacement, determining that no abnormal sound risk exists. The invention further discloses an analysis method of the simulation analysis system for the abnormal sound of automotive upholstery. The analysis method comprises the steps that a finished automobile finite element model is established, the static limit torsion working condition and the dynamic road spectrum working condition are loaded respectively, time domain transient response analysis is carried out to obtain time domain relative displacement curves respectively, and whether the abnormal sound risk exists or not is judged according to the relative displacement. According to the invention, the accuracy of abnormal sound prediction is improved.

The invention discloses a visualized analysis method for energy distribution under a disk structure collision impact. The method comprises the following steps that: a: determining the model parameterof a collided disk structure; b: determining the collision parameter of the disk structure; c: establishing a finite element model, and carrying out transient state response to obtain the modal information of the collided disk structure; d: extracting the node information file and the unit information file of the collided disk structure, generating a power flow model, and calculating vibration power; and e: obtaining a power flow power flow and an energy wave cloud picture, comparing with a stress wave cloud picture to obtain an energy transfer path and an energy distribution change situationof the disk structure under collision. By use of the method, a finite element power flow method is used for carrying out visualized analysis on the energy distribution and transmission path of the disk structure under collision, all information of vibration characteristics can be provided, a calculated amount is small, calculation accuracy is high, and the size and the direction of the energy transferring of the disk structure at any moment can be quickly and accurately obtained.

The invention provides a whole vehicle abnormal sound simulation analysis method and system and a computer readable storage medium, and the method faces real road working conditions, and comprises the steps: S1, obtaining a whole vehicle body side abnormal sound road spectrum; s2, building an abnormal sound simulation model; s3, creating a node pairing unit group; s4, loading an abnormal sound road spectrum; s5, operating modal transient response analysis; s6, extracting relative displacement; s7, generating impact and friction abnormal sound evaluation indexes; and S8, carrying out impact and friction abnormal sound risk evaluation. The method can be used for in-vehicle impact and friction abnormal sound risk prediction in the whole vehicle design stage, and problem rectification in the real vehicle stage is reduced, so that the whole vehicle abnormal sound performance development process is accelerated, after-sales TGW abnormal sound complaints are reduced, and the user experience feeling is improved.

A transient response analysis program of a capacitor is used for making a computer execute a transient response analysis of the capacitor having impedance in a positive frequency region. This program includes at least nine steps, especially estimates impedances at zero frequency from respective impedances in positive and negative frequency regions, and reflects the result on the transient response analysis.

The invention relates to the technical field of electromagnetic compatibility, and in particular relates to a transient response analysis method for a transmission line system terminated with a frequency-variable load. The method comprises the following steps: firstly, measuring or calculating the admittance of a frequency-variable load port at a sampling frequency point to obtain corresponding sampling admittance, and carrying out equivalence on the admittance of the port by adopting a rational function approximation mode; secondly, solving a pole and a residue required by a rational approximation function by adopting a matrix pencil method, and substituting the pole and the residue into a piecewise linear recursive convolution technology to realize piecewise linear recursive convolution expression of voltage at a connection point of the transmission line and the frequency-variable load; and finally, realizing transient response analysis of the transmission line system with the frequency-variable load in combination with a transmission line equation. According to the method, the matrix pencil method (MPM) and the piecewise linear recursive convolution (PLRC) technology are combined, transient response analysis of the transmission line system of the terminating frequency-variable load is achieved, meanwhile, the method has the advantages of being rapid in calculation and high in applicability, and the method can be applied to analysis of the electromagnetic compatibility problem in the fields of electric power, control, communication and the like.

The dynamic measurement time domain compensation method includes approximating the measured parameter curve into sectional broken lines and recursion calculation to obtain measured parameter based on the kick point and slope of the broken lines. In determining the kick point and slope of a broken line, the discreet value of sensor output is calculated through analysis and recursion based on the instantaneous response of inertial link, the broken line model is then determined dynamically based the difference between the discreet value and the practical value, and the broken line signal value is finally calculated through recursion calculation based on the broken line model. The said method can raise the dynamic measurement response speed and precision, and the simple time domain recursion algorithm is simple, timely, suitable for realizing with microcomputer assemble language, low in cost, flexible and intelligent, and is suitable for measurement of various physical quantities with sensor being inertial link.

The present invention proposes a thin-walled structure thermal aeroelasticity dynamic response analysis method, according to the thin-walled structure and boundary conditions, the thin-walled structure is discretized into shell elements with seven degrees of freedom, and the ribs are discretized into beam elements with seven degrees of freedom. The thin-walled finite element model is used to obtain the structural finite element grid; the temperature field of the thin-walled structure is applied to the structural finite element grid, and the linear flutter analysis is performed on the finite element model to obtain the unsteady gas corresponding to each reduction frequency k Power matrix Q k , to fit the time-domain expression of the unsteady aerodynamic matrix; iteratively calculate the time-domain expression of the unsteady aerodynamic matrix, analyze the nonlinear transient response of the thin-walled structure, and obtain the nonlinear thermal Aeroelastic dynamic response. The method of the invention can solve the calculation problem of the nonlinear thermal aeroelastic dynamic response of the complex thin-walled structure.

The present invention discloses a carrier transient response indication method based on a star satellite load couple analysis result. The method comprises the following steps of taking carrier or satellite interface time domain acceleration data obtained in the star satellite load couple analysis process as an agreed boundary between the carrier and the satellite in a certain research stage and loading the data to a carrier or satellite docking point in a combined body physical model of the carrier and effective load in a forced acceleration manner, and performing transient response analysis and calculation on the combined body physical model so as to obtain desired carrier or an effective load interface and response data of internal nodes of the carrier. According to the carrier transient response indication method based on the star satellite load couple analysis result, the large difference between boundary impedance and actual flying condition of the frequency response analysis method in response indication is prevented, and calculation number of times are not limited by whole satellite load couple analysis number of times, so that the local improvement effect of the carrier structure can be indicated and evaluated.