5 results about "Transfer matrix" patented technology

This invention discloses a dynamic load identification method and apparatus based on a physically guided convolutional long short-term memory network, relating to the field of data processing. The method includes: constructing and training a dynamic load identification model based on a convolutional long short-term memory network to obtain a trained dynamic load identification model; the loss functions used in the training process of the dynamic load identification model include a data-driven loss function and a physically guided loss function. The physically guided loss function is constructed based on the dynamic equations transformed from the motion equations of a linear system under dynamic action, and uses an overall transfer matrix; acquiring the time-domain signals of acceleration and / or strain responses of each test point collected within each time window when the dynamic load to be identified is applied to one or more points on the structure, and inputting these signals into the trained dynamic load identification model to obtain the predicted dynamic load corresponding to one or more points. This invention solves the problem of the current load identification method's strong dependence on data.

This application discloses a method and related device for identifying the stiffness and resistance parameters of pipeline hangers, relating to the field of pipeline system dynamics analysis technology. The method includes acquiring the geometric and material parameters of the pipeline system and establishing a transfer matrix dynamic model; constructing a frequency response function based on vibration response and extracting experimental frequency response data; constructing a forward calculation model of the frequency response function, calculating theoretical frequency response data, and extracting characteristic parameters; comparing experimental and theoretical frequency response characteristic parameters to obtain frequency response error data; searching for Pareto optimal solutions within the feasible search range of stiffness and damping based on the frequency response error data and the NSGA-II algorithm, and selecting optimal stiffness and damping parameters from the Pareto optimal solution set based on the normalized weighted Euclidean distance criterion. This application eliminates the need for direct contact measurement of the hangers; parameter identification can be achieved simply by collecting the vibration response on the pipeline, solving the technical problem of accurately measuring the dynamic parameters of hangers under complex working conditions.

The application discloses a kind of based on finite difference reduction multibody system transfer matrix method of rotating beam system dynamic characteristic analysis method and system.Method includes: the physical parameter model of rotating beam system is established, and the structural parameter of rotating beam is acquired;Rotating beam system dynamics control differential equation is established;Rotating beam system is discretized using finite difference method;The transfer matrix of the discretized multibody system model is constructed, and the transfer matrix is processed using reduction equation, and the reduced difference point reduction transfer matrix recursive relationship is obtained;The reduced state vector recursive equation is established, and the dynamic characteristic parameter of rotating beam system is calculated and output.The application is combined with finite difference method by multibody system transfer matrix method, and rotating beam element is discretized difference, and the differential term of rotating beam differential equation is differentially approximated to deduce transfer matrix, retains the characteristics of low matrix order involved in transfer matrix method, reduces the calculation scale, improves the success rate of numerical calculation result, and can effectively solve rotating beam and other dynamics problems.

The application discloses a kind of shipboard aircraft dynamics fast calculation method.Method includes following process: establishing shipboard aircraft catapult take-off multi-flexible body system dynamics model, establishes shipboard aircraft catapult take-off multi-flexible body system topology, utilize finite element method to establish main tire refinement finite element model, then tire flexible body dynamics characteristic parameter is exported and deduces the dynamics equation of tire flexible element, based on multi-body system transfer matrix method (MSTMM) and finite element modal synthesis method deduce shipboard aircraft catapult take-off multi-flexible body system total transfer equation and total transfer matrix, solve the inherent frequency of shipboard aircraft multi-flexible body system considering inflatable flexible tire and the dynamic response of catapult take-off;The method proposed in the application overcomes the defects of high matrix order and large amount of calculation of traditional methods when dealing with complex coupling system of shipboard aircraft containing inflatable flexible tire, has the advantages of fast calculation speed, high degree of programming and strong universality, provides an efficient calculation method for the dynamic analysis of complex shipboard aircraft multi-flexible body system.

The application relates to a high-order rotationally symmetric target heterogeneous parallel electromagnetic simulation method and system based on a moment method and an equivalent principle method, high-order line basis functions are introduced into a rotationally symmetric body algorithm based on the equivalent principle method, adaptive high-order matrix filling, loop reduction and boundary division are completed based on a deep calculation unit architecture, and an LU matrix inversion operator under the architecture is proposed; first, a rotationally symmetric target is geometrically modeled and equivalent surface modeled, an EPA-BoR equation set is constructed, a high-order U matrix and a transfer matrix are derived; then, each matrix of the high-order EPA-BoR equation set is generated based on a heterogeneous parallel calculation strategy; after each MPI process generates corresponding scattering operators and translation operators, electromagnetic scattering solving is completed through inter-process transmission calculation; and finally, the radar scattering cross section of the rotationally symmetric target is calculated according to current solving results. The application has high calculation precision, low memory occupation and greatly improved solving efficiency.