64results about How to "Improve simulation speed" patented technology

A mirror surface defect detection system imaging simulation method based on a structured light field comprises the steps that S1, system parameters are calibrated and serve as simulation model input; and S2, deducing a light propagation model of the light field camera, performing light tracing from a sensor, performing parallel calculation on the light field sub-graph array, and solving an incident light vector of the light field camera. And S3, designing a three-dimensional surface shape of a function fitting deformation defect, solving an incident light vector at the defect, and tracing light to obtain a light source point coordinate and illumination intensity. And S4, based on a Lambert diffuse reflection model, introducing a coefficient representing scratch roughness / stain opacity, and establishing a diffuse reflection non-deformation defect gray model. And S5, generating a simulation image and a label thereof. And comparing the simulation image with the real shot image, and evaluating the reliability of the simulation model. And evaluating the operation efficiency of the simulation model. According to the method, the precision and speed of mirror surface defect light field detection imaging simulation are effectively improved, and the method can be applied to parameter optimization, simulation image data set generation and the like before construction of a detection system.

The invention belongs to the technical field of power distribution network operation, and particularly relates to a power distribution network small-step simulator synchronous simulation method and device, and the method comprises the steps: dividing a power distribution network into a plurality of line sub-partitions based on a distributed capacitance equivalent calculation method, each line sub-partition is provided with at least one simulator, and the simulation step lengths of the simulators are not uniform; each line sub-partition performs collaborative parallel simulation according to a preset simulation time period and a simulation step length based on the respective simulation machine; in the collaborative parallel simulation process, interpolation processing is executed on data needing to be interacted between simulation machines with different simulation rates; and / or, performing partition time delay compensation on the line sub-partitions with partition time delay in a voltage signal compensation mode; and after the simulation is completed, combining the simulation results of the circuit sub-partitions. According to the technical scheme provided by the invention, the operation state of the power distribution network is accurately simulated, the simulation speed is improved, and the accuracy and reliability of a simulation result are improved.

The invention discloses an accelerated simulation method of a gradient period polarization holographic grating and a related device, and the method comprises the steps: carrying out the D (kin) calculation of the direction of predicted incident light after passing through a grating layer, multiplying a calculation result with the amplitude of the corresponding incident light, calculating the diffraction efficiency, and carrying out the acceleration simulation of the gradient period polarization holographic grating. Compared with a traditional simulation method using complete strict coupling wave calculation, the method has the advantages that the process operation of multiple integration, matrix multiplication and matrix inversion is reduced, and the simulation speed can be greatly accelerated.

The invention discloses a 10kV power system overvoltage protection and optimization method based on an EMTP simulation technology, and the method comprises the steps: constructing a multi-layer simulation model, and carrying out the simulation analysis; modeling and predicting the overvoltage trend of the power system by collecting simulation data and utilizing a machine learning algorithm; in the simulation process, cable modeling parameters including resistance, capacitance and inductance are dynamically updated in real time, and the actual operation state of the cable is simulated; based on a high-frequency transient electromagnetic interference signal detected in real time, an interference elimination scheme is automatically generated and adjusted; performing parallel operation on the simulation scene by adopting quantum calculation, and synchronously performing overvoltage protection optimization; and summarizing and optimizing the simulation data to generate an improved protection scheme. According to the invention, the anti-interference capability and the operation reliability of the power system are obviously improved, the safe operation of the system in various complex operation scenes is ensured, the service life of power equipment is effectively prolonged, and the operation fault risk is reduced.

The invention discloses a signal integrity analysis and optimization method considering electrothermal coupling and parasitic effect in an artificial intelligence chip. According to the method, aiming at a random resistive memory cross array in an artificial intelligence chip, an RRAM compact model is combined to research the influence of device electrothermal coupling and parasitic effect on signal integrity in the cross array, evaluation analysis is carried out, and an optimization scheme is provided. Comprising the following steps: (1) based on a compact model of an RRAM device, establishing an equivalent thermal circuit network to represent an electrothermal coupling effect of a device in a cross array; (2) establishing an interconnection line equivalent circuit model containing parasitic resistance, capacitance and inductance, and extracting parasitic parameters in the model by adopting a partial element equivalent circuit (PEEC) method; (3) analyzing a simulation result, and realizing signal integrity evaluation considering electrothermal coupling, parasitic effect and the like; and (4) proposing an optimization scheme for the problems of parasitic voltage drop and leakage path. The method has important application value in random resistive memories and neuromorphic brain-like chips.

The invention discloses a rotary kiln multi-physical phenomenon numerical simulation method based on artificial intelligence reasoning, and relates to the technical field of rotary kiln multi-physical phenomenon simulation. On the basis of an Euler multiphase flow equation, a heat transfer model, a chemical kinetic reaction model, a particle growth model, a chemical reaction model and the like are added; establishing a three-dimensional numerical model capable of accurately simulating multiple physical and chemical phenomena such as gas-solid two-phase flow movement, combustion, NOx generation, clinker calcination and particle growth in the rotary kiln; a long-short-term memory neural network is introduced to build an AI model, the AI model is used for predicting the working condition of the second half section of the model, the simulation speed is increased, and long-time simulation of the rotary kiln is achieved.

The present invention relates to the technical field of hydroelectric units, and is an ADPSS-based turbine isolated grid control parameter verification device and a method of use, including an ADPSS simulation platform simulating and outputting a grid frequency signal, and receiving a power signal output by a hydroelectric unit speed governor simulation platform for iterative calculation; the hydroelectric unit speed governor simulation platform combines the grid frequency signal simulation to determine the guide vane opening signal, and converts the guide vane opening signal into a power signal; a transmission device builds a communication link between the ADPSS simulation platform and the hydroelectric unit speed governor simulation platform. The present invention improves the simulation speed and authenticity of the hydroelectric unit speed governor in an isolated grid mode through the heterogeneous parallelization of an FPGA module, a physical interface box, and a turbine speed governor simulation platform, and solves the problem that when the current turbine isolated grid control parameter setting uses a frequency step disturbance, only a step amount of a given step length can be used, and there is no effective interaction between the turbine and the grid.

The present invention provides a method and device for dividing the carcass mesh of the bead area for tire finite element analysis, firstly identifying the bead area on the left and right sides of the tire material distribution diagram, then adding auxiliary dividing lines at the bead area to divide the lower part of the bead area into a carcass turn-up outer section and a carcass turn-up inner section, adding vertical dashed lines at the bead area to divide the carcass turn-up outer section and the carcass turn-up inner section of the bead area equally, and finally stretching and transforming the vertical dashed lines of the carcass turn-up outer section and the carcass turn-up inner section of the bead area. The scheme of the present invention can reduce or eliminate the situation that the carcass mesh of the bead area is excessively distorted in the current tire finite element simulation analysis, resulting in the simulation result not converging and the inability to obtain the result, thereby improving the efficiency of tire finite element simulation analysis, saving simulation calculation resources, and shortening the tire product development cycle.

The application provides a multi-platform cooperative control system and method based on adaptive cruise, comprising a state monitoring platform, an intelligent ticketing platform, a digital twin platform, a dispatching platform and a response review platform; the state monitoring platform obtains real-time operation data of a target power grid through a distributed sensor network and outputs a state diagnosis result; the intelligent ticketing platform automatically generates an operation ticket based on a power grid knowledge graph; the digital twin platform constructs an adaptive dynamic simulation model using the real-time operation data and the state diagnosis result, and simulates and verifies the operation ticket; the dispatching platform dispatches network orders to power grid equipment according to the operation ticket and the simulation verification result; and the response review platform reviews and verifies the state after the dispatching. Through the construction of a multi-platform cooperative control mechanism and the establishment of an adaptive dynamic simulation model, the simulation accuracy and speed are improved, and the safety of the power grid and the efficiency of power grid dispatching are further improved.

The invention discloses an electromagnetic transient simulation method, system, equipment and medium based on an error compensation variational algorithm, and belongs to the technical field of electromagnetic transient simulation, and the method comprises the steps: obtaining discrete node electrical parameters of a power system, building an electromagnetic transient equivalent model based on the parameters, and building a loss function; preparing a quantum state representing node voltage through the parameter-containing quantum circuit, calculating a function value of a loss function by using a measurement result of the prepared quantum state, and iteratively updating a variational parameter of the parameter-containing quantum circuit by using the function value; obtaining a measurement result of the quantum state enabling the loss function to converge, and obtaining a solved voltage; and calculating a residual error for error compensation by using the target equivalent admittance matrix, the injection current of the node and the solved voltage, correcting the solved voltage by using the residual error, and obtaining the corrected voltage as an electromagnetic transient simulation result at the current moment. According to the method, calculation errors caused by a current noise-containing quantum computer are relieved, and high-precision solving of the linear equation set is achieved.

The invention discloses a transmission line decoupling simulation acceleration method and system, and the method comprises the steps: carrying out the decoupling of transmission lines between internal combustion engines and between the internal combustion engines and energy storage through the natural decoupling characteristics of the transmission lines, and obtaining a transmission line decoupling characteristic equation; constructing a transmission line decoupling circuit model through the transmission line decoupling characteristic equation; and based on a transmission line decoupling circuit model, independent simulation solution is carried out through voltage and current information interaction. According to the method, the calculation complexity of reconstruction and inversion calculation of a high-order matrix is avoided, the calculation amount during system calculation is reduced, and the electromagnetic transient simulation speed is increased.

The invention provides a sparse LU decomposition acceleration method for adaptive matrix multiplication based on density perception. The method comprises the steps that multiple sets of sub-matrix blocks corresponding to a target sparse matrix are input into a target random forest model, an optimal matrix multiplication corresponding to each set of sub-matrix blocks is obtained, and the multiple sets of sub-matrix blocks are obtained by grouping a plurality of sub-matrix blocks formed after the target sparse matrix is partitioned; performing LU decomposition on the target sparse matrix based on the optimal matrix multiplication corresponding to each group of sub-matrix blocks to obtain an L matrix and a U matrix corresponding to the target sparse matrix; and performing electronic circuit simulation based on the L matrix and the U matrix corresponding to the target sparse matrix. According to the sparse LU decomposition acceleration method for adaptive matrix multiplication based on density perception, adaptive selection of matrix multiplication can be realized, target sparse matrix LU decomposition can be accelerated, such as a matrix formed by circuit simulation and an electronic circuit simulation speed, and the sparse LU decomposition acceleration method is also suitable for other matrixes with similar structures in other fields.

This invention provides a non-uniform discrete equivalent circuit modeling method and system for electromigration reliability. It employs an equivalent circuit-based approach to analyze the electromigration stress evolution of general complex interconnect structures, fully considering thermal field effects in the model. This achieves equivalent circuit modeling for stress analysis under multi-physics coupling. Furthermore, by using an adaptive mesh method with non-uniform spatial discretization and a steady-state / quasi-steady-state filtering mechanism, it solves the problem of wasted computational resources in traditional uniform discretization methods when dealing with large-span interconnect structures, and avoids unnecessary transient simulations of immortal interconnect trees, reducing the computational load of full-chip-level analysis. This enables efficient and high-precision transient analysis of the electromigration reliability of large-scale interconnect networks under multi-physics coupling effects.

The application discloses a near-field equivalent method, a mask 3D near-field correction method and a storage medium. The optical near-field equivalent method comprises the following steps: setting a three-axis coordinate system, so that the initial propagation direction of a light source with a preset angle is propagated along a first axis, and an initial wave vector and a polarization direction are obtained; performing a rotation operation on the initial wave vector and the polarization direction according to the preset angle of the light source; analyzing the polarization direction and the polarization vector of the light source after the rotation operation; rotating the polygon and the light source according to the preset angle of the polygon, so that a new wave vector and a corresponding rotation angle are obtained; analyzing the polarization direction, the polarization vector and the component of the light source after the second rotation operation; generating an edge near-field under equivalent conditions by using a 2D strict electromagnetism algorithm; and performing linear superposition according to the respective components based on the polarization direction of the light source after the second rotation operation, so that an equivalent near-field result is obtained. The application reduces the calculation burden of near-field generation.

The application provides a hardware perception-based model quantization method, system, medium, product and terminal, a hybrid execution mechanism is constructed between a high-level software framework and a bottom layer hardware behavior model, only core calculation operators in a quantization calculation graph of an initial quantization model which need to be executed on target hardware are handed over to a hardware behavior model for bit precision simulation, real calculation characteristics of the target hardware are simulated in a quantization process, and other auxiliary, non-computation-intensive operators are reserved in the high-level software framework for execution, so that the simulation verification efficiency is improved, the simulation precision and the execution efficiency are considered, and the goal that the quantized model runs more efficiently and has lower precision loss on the target hardware is achieved.

The invention discloses a universal method for accelerating EDA (Electronic Design Automation) simulation speed, which comprises the following steps: S1, preparing information required by chip simulation or verification, the information comprising a design file, a process file and last-round simulation or verification data; s2, after the information preparation is completed, according to a simulation or verification type needing to be performed, determining a proper EDA tool, starting the tool, and reading information including a design file, a process file and previous simulation or verification data so as to perform chip simulation and verification; and S3, exporting a simulation or verification result, and exporting simulation or verification data of the round. The invention discloses a universal method for accelerating EDA (Electronic Design Automation) simulation speed, which is a new method for accelerating calculation or reducing calculation amount by introducing previous-round simulation or verification data in a current-round simulation or verification process, and exporting a database for accelerating next-round simulation or verification in the current-round simulation or verification process. And the simulation or verification time is greatly reduced.

The invention relates to a fast simulation system and method based on target online reconstruction, the system comprises a task computer, a local area network system and a ground station system, the ground station system issues task information to the task computer, and the task computer feeds back a flight state and a task execution state and result to the ground station system. Meanwhile, the ground station system is used for displaying a flight route, a state and a task effect; a task machine in the task computer issues a real-time task point and a task instruction to the simulation machine, and the simulation machine feeds back real-time state information to the task machine; and the task computer and the ground station system communicate through the local area network system to complete data link transmission. A digital map in a task computer is preprocessed, waypoints of the digital map are subjected to small-scale conversion, the simulation speed is further increased, meanwhile, an aircraft model in a task computer simulation module and a task planning module in a ground station system can be rapidly modified and replaced at any time, the efficiency of the simulation system is improved, and the simulation cost is reduced. And the actual adjustment requirement of target online reconstruction can be met to the greatest extent.

The present application relates to a sintered grinding wheel grinding surface morphology simulation control method, device, equipment and medium, the method comprising: according to the external vertices of random abrasive particles located in the circumference of the first retained abrasive particles, the volume of the convex polyhedron of the random abrasive particles is calculated and determined, and the random abrasive particles are determined as interference abrasive particles and removed according to the volume of the convex polyhedron to determine the second retained abrasive particles in the binder unit; according to the multiple first vertices of the random abrasive particles in the circumference of the second retained abrasive particles, the multiple second vertices of the second retained abrasive particles in the circumference of the random abrasive particles, and the characteristic surfaces constructed by the multiple characteristic vertices and the second vertices, the random abrasive particles are determined as interference abrasive particles and removed to determine the third retained abrasive particles in the binder unit, to determine multiple sintered grinding wheel unit cells of different grinding wheel concentrations, and to construct a sintered grinding wheel of target grinding wheel concentration using multiple sintered grinding wheel unit cells of different grinding wheel concentrations for simulation. The present application greatly improves the accuracy of the sintered grinding wheel.

The invention provides a chip verification method and device based on a test case. The method comprises the following steps: running a folder generation script based on a to-be-verified chip; based on the folder generation script and a test case keyword input condition, obtaining at least one target folder by utilizing a pre-constructed test case folder; wherein the test case folder comprises script files of a plurality of test cases, and the target folder is a function point test case folder related to a keyword of the test case or a default function point test case folder; and running a simulation command based on the target folder to obtain a test result. According to the method and the device, a plurality of function point test case folders related to the test can be generated once through the script, so that the folders correspond to the function point test cases one by one to run the simulation command, the creation process of the multi-test case simulation folder is simplified, the cost is low, and the simulation efficiency is conveniently improved.

The present invention relates to a method and system for establishing an equivalent model of a doubly-fed wind turbine group. Based on the low voltage ride-through characteristics of the doubly-fed wind turbine group, the active power and reactive power of the doubly-fed wind turbine group during the low voltage ride-through period are adjusted, which can not only suppress the doubly-fed wind turbine group from being disconnected from the grid at overspeed during the LVRT period, but also ensure that the doubly-fed wind turbine group provides reactive power support to the power grid during the LVRT period in accordance with the requirements of the National Standard of the People's Republic of China GB / T36995‑2018 "Test Procedure for Fault Voltage Ride-through Capability of Wind Generator Groups". On this basis, a doubly-fed wind turbine group equivalent method is proposed. The method reduces the order of the doubly-fed wind turbine group model, and can improve the simulation speed while ensuring the simulation accuracy.

The invention discloses a multi-physical field simulation method based on time domain discontinuous Galerkin and finite element mixing, and mainly solves the problems of low calculation speed and high memory consumption of electromagnetic-thermal-mechanical multi-physical simulation. Comprising the following steps: 1) setting the total time step number of simulation and initializing; 2) performing electromagnetic simulation by using a time domain discontinuous Galerkin method to obtain electromagnetic field distribution; 3) performing thermal simulation by using a finite element method based on an electromagnetic simulation result to obtain temperature distribution; 4) correcting the relationship between stress and strain according to the temperature variation of thermal simulation, and performing force simulation by using a finite element method to obtain displacement to obtain a deformation grid; and 5) electromagnetic simulation of the next time step is carried out based on the deformation grid until the total time step number is completely completed, and the multi-physics field simulation task is ended. According to the invention, the speed of multi-physics field simulation can be effectively improved, and the memory consumption is reduced, so that the capability of multi-physics field simulation is improved.

The invention discloses an electromechanical transient simulation method and system for a doubly-fed wind turbine generator, and belongs to the technical field of electromechanical transient simulation of a power system. The method comprises the following steps: determining a necessary simulation link according to a simulation time scale and an action frequency band of electromechanical transient simulation of the doubly-fed wind turbine generator, and establishing a simulation module based on the necessary link; establishing a mathematical model of the simulation modules, and establishing an interaction relationship between electrical data and control signals among the simulation modules based on the coupling relationship among the necessary links; and establishing an electromechanical transient simulation model of the doubly-fed wind turbine generator based on the mathematical model and the interaction relationship, and performing electromechanical transient simulation on the doubly-fed wind turbine generator based on the electromechanical transient simulation model. According to the method, a large number of model parameters do not need to be modified, different types of simulation models can be flexibly switched only through selection of the grid-connected interface, and the simulation speed is increased under the condition that it is guaranteed that the simulation precision meets the requirement.

The present invention discloses a broadband electromagnetic simulation method using efficient adaptive frequency scanning. The present invention proposes to use an error formula to judge the convergence of frequency response, thereby being able to obtain appropriate frequency sampling points, which reduces the required sampling points and speeds up the simulation compared to other methods. The present invention proposes to convert a nonlinear problem into two linear problems, iteratively calculate the precise pole and residue values, solve the linear equation, obtain an accurate frequency response fitting value, speed up the calculation rate, and improve the accuracy.

The present invention discloses a CAD model simulation method for maintaining design features based on extended voxels. The method uses voxels as information containers for design intent and simulation intent. On the basis of a fixed grid method, the method combines features with grids, takes voxels as basic units, records the editing operations of model features, and embeds features into voxels. Various data related to units in the simulation (such as volume and stiffness matrix) are also stored via voxels. The recorded feature attributes are queried to determine the voxels that need to retain data and the voxels that need to be recalculated before and after the model is edited. The method of the present invention can significantly reduce the calculation time by reusing the calculation results of the previous step without affecting the calculation accuracy at all; it also meets the decoupling of the simulation method and can be adapted to any fixed grid method. The method of the present invention has been tested with a large number of numerical examples (including design optimization examples with millions of degrees of freedom), which shows that the performance of the method is better than that of the classical method.

The invention relates to a radio frequency electrode simulation method and device, computer equipment and a storage medium, the method is applied to a periodic electrode, and the method comprises the steps that a three-dimensional electrode model is established according to the type of a radio frequency electrode needing to be simulated; establishing a simulation model according to the three-dimensional electrode model; performing simulation according to the simulation model and a first formula to obtain a plurality of design parameter groups; acquiring a simulation result of the radio frequency electrode needing to be simulated according to the plurality of design parameter groups, the first formula and a screening condition; wherein the three-dimensional electrode model comprises electrodes with boundary conditions and a preset number of periods, and the preset number of periods are one period or a half period. According to the invention, the simulation speed can be improved.

The invention provides a sequential circuit hybrid fault simulation method, which is used for simulating a sequential circuit fault coverage rate by injecting a fault point into a sequential circuit, and comprises the following steps: S1, obtaining a to-be-simulated circuit netlist, identifying a strong connection component in the to-be-simulated circuit netlist, and marking the strong connection component meeting a preset small-scale strong connection loop constraint condition; s2, performing simulation of multiple periods on the marked circuit netlist to be simulated, and executing in each simulation period: S21, performing code compilation on the marked strong communication components so as to fuse each marked strong communication component into a compilation node, performing compilation type simulation on each compilation node until the state converges, and performing simulation on the compilation node until the state converges; the topology is updated, and the output of each compiling node is used as an event to be transmitted to other areas in the circuit netlist; and S22, taking other areas except the compiling node as event driving nodes, simulating residual circuits in an event scheduling mode, and updating the state of the circuits.

This invention discloses a five-level active midpoint clamping circuit structure and design method based on an average model. Ignoring redundancy, the five-level active midpoint clamping circuit structure based on the average model includes two controlled voltage sources, two controlled current sources, two DC bus capacitors, and a floating capacitor. The series and parallel connection of the controlled voltage and current sources is shown in the attached figure of the abstract. The current of the controlled current source is determined by the output current of the five-level circuit, and the voltage of the controlled voltage source is determined by the positive and negative voltages of the two DC bus capacitors. This invention can simulate the voltage fluctuation of a five-level active midpoint clamping circuit switching model. It considers the impact of voltage fluctuations on the AC side and can control the voltage fluctuation of the five-level active midpoint clamping circuit within a reasonable range. It has strong versatility and greatly improves simulation speed.

The present invention discloses an accelerated iterative simulation method for HVAC airflow organization based on a multi-grid method, and relates to the technical field of HVAC airflow organization simulation. The method comprises: obtaining system information and a first three-dimensional model of a target HVAC system; performing hierarchical half-edge conversion based on the first three-dimensional model to generate half-edge structure data; generating a non-fitting grid based on the first three-dimensional model and the half-edge structure data, and simultaneously or afterwards, generating a fitting grid based on the first three-dimensional model and the half-edge structure data; establishing a nonlinear partial differential equation of the target HVAC system based on the system information, the non-fitting grid, and the fitting grid, solving the equation using a multi-grid method, and generating a simulation result of the target HVAC system. The present invention effectively improves the efficiency and accuracy of HVAC airflow organization simulation by using technical means such as a multi-grid method, hierarchical half-edge conversion, and dynamic threshold adjustment.

The invention relates to a high-efficiency electromagnetic transient modeling method for a hybrid high-voltage direct-current power transmission system containing an IGCT (integrated gate commutation current transformer), and belongs to the field of electric digital data processing. The IGCT high-voltage direct-current power transmission system comprises a power grid commutation current transformer at a sending end, an IGCT current transformer at a receiving end and a direct-current power transmission line between the power grid commutation current transformer and the IGCT current transformer; the efficient electromagnetic transient modeling method comprises the following steps: at a power grid commutation current converter at a sending end, simplifying the switching operation of a thyristor into a port voltage and current average value model by adopting an averaging modeling method, thereby improving the simulation efficiency of the current converter at the sending end; a Thevenin equivalent method is adopted at the IGCT current converter of the receiving end, and an IGCT switch is dynamically simplified into a Norton equivalent circuit model of a current source and impedance, so that the simulation efficiency of the current converter of the receiving end is improved; for a direct current transmission line between transmitting and receiving end converter stations, a Bergeron model is adopted to decouple the two ends of the whole line, so that the electrical response of the two ends can be processed independently, the complexity of mutual coupling of the two ends of the line is reduced, and the calculation process is simplified.

The invention provides a spacecraft system-level electromechanical heat signal coupling distributed simulation method based on single-machine granularity, and the method comprises the steps: building a spacecraft system-level simulation model distributed simulation architecture, and decoupling a whole spacecraft system-level simulation model into one system-level terminal model, four electromechanical heat signal overall models, and N subsystem terminal models, four overall model frameworks and N subsystem server side communication modules are built in the system-level terminal model; establishing a subsystem model and subsystem client communication module in each subsystem terminal model; wherein the subsystem model establishes a single-machine model by taking a single machine as the minimum granularity, and is established by taking the single-machine model as a basic unit according to the equipment architecture of the subsystem; establishing an overall model of spacecraft machinery, dynamics, energy, heat and information; and carrying out whole-process system-level multidisciplinary linkage simulation on the spacecraft by utilizing the system-level terminal model, all the overall models and all the subsystem terminal models.