8 results about "Mathematical software" patented technology

This invention provides a simulation method for a DC output characteristic model of a van der Waals bipolar junction transistor (VJT), relating to the field of semiconductor device technology. The method includes: acquiring a target VJT and experimentally measuring its output characteristic curve; constructing a DC output characteristic model of the target VJT based on the output characteristic curve and obtaining initial parameters for the DC output characteristic model; iteratively optimizing the initial parameters using existing mathematical software to obtain optimized parameters; constructing a simulation module based on the DC output characteristic model and setting simulation parameters based on the optimized parameters; and performing simulation calculations using the simulation module to obtain simulation data and simulation curves for the target VJT, thus completing the simulation. This invention enables rapid judgment of the characteristics of a target VJT by constructing a simulation module for the target VJT and performing simulation calculations using the simulation module to obtain simulation data and simulation curves.

The application discloses a SPICE macro model establishment method of balancing drain-source capacitance of a super-junction MOSFET, which is applied to the field of electronic component modeling and solves the problems of high fitting difficulty and poor precision in the modeling scheme of the existing super-junction MOSFET parasitic capacitance. The application firstly tests and obtains data of the super-junction MOSFET parasitic capacitance changing with the drain-source voltage; then establishes an equivalent circuit topology of the drain-source capacitance based on the device depletion mechanism; further extracts cell process parameters reversely from the capacitance test data, builds a mathematical description of the drain-source capacitance, and completes coefficient fitting based on mathematical software to determine macro model circuit parameters; finally, the SPICE model is written and packaged, and finally the drain-source capacitance macro model module which can be called in the super-junction MOSFET SPICE model is obtained. The establishment method is based on the physical mechanism of the super-junction MOSFET, can realize high-precision fitting of the drain-source capacitance in the full-voltage range in the semi-logarithmic coordinate, and can be widely applied to the conventional super-junction MOSFET products of charge balance.

The application relates to a virtual-real combined multi-machine cooperative semi-physical simulation system and method; the system at least comprises a multi-model parallel simulation machine, an interface device, a real physical guidance prototype and a real-time network; the multi-model parallel simulation machine is used for real-time solution of mathematical software of aircraft dynamics, kinematics equations and control systems; data interaction between the real physical guidance prototype and the multi-model parallel simulation machine is realized through the real-time network and the interface device. The simulation method provided by the application has strong expansibility and high universality; by using the simulation method and system provided by the application, only adaptive development of model quantity in the multi-model parallel simulation machine and different model requirements is needed, so that different model verification requirements can be matched.

The application provides a surrounding rock plastic zone solving and imaging method considering the shear stress direction: by analyzing the process that the three-direction principal stresses of any point around a roadway are deflected around three main shafts of a space rectangular coordinate system, stress expressions of three pairs of corresponding shear stresses of the roadway in the vertical, horizontal and axial directions are obtained under the deflection conditions around the respective main shafts, and then the distribution characteristics of the plastic zone of the roadway surrounding rock considering the shear stress direction are calculated, the distribution characteristics of the plastic zone are imaged in the range of 0-360 degrees by using mathematical software, and a plastic zone shape diagram is obtained. The method can further clarify the mechanism of the "asymmetric" deformation and damage of the roadway surrounding rock, so as to provide more accurate data for a supporting scheme.

The present invention provides a method and device for decentralized control of shell vibration of an MFC piezoelectric actuator. The method comprises: S1, embedding the MFC piezoelectric actuator in a shell to obtain data parameters; S2, obtaining a differential equation based on the data parameters, and converting the differential equation into a state-space equation; S3, performing a linear transformation on the state-space equation and state vector to obtain a transformed equation and vector; S4, performing expansion-decoupling-contraction based on the inclusion principle to obtain an expanded system; S5, extracting two overlapping substructures of the substructure from the expanded system, performing decentralized control design of shell vibration on the overlapping substructures, and obtaining performance indicators; S6, using mathematical software to calculate the state feedback gain matrix of the overlapping substructures, and performing decentralized vibration control on the shell. By adopting a decentralized control method, the present invention improves the vibration characteristics of the shell and enhances the stability of control.

The application aims to provide a smart door opening angle control method, system and smart door, wherein the door leaf is rotated to drive the follow-up control module to rotate, the door leaf is rotated according to the preset rotation angle gradient of the follow-up control module, until the maximum opening angle of the door leaf, and the corresponding position after each rotation of the door leaf is marked; the follow-up control module rotation signal is fed back by the acquisition module, the follow-up control module rotation signal fed back by the acquisition module is converted into the actual follow-up angle by the data conversion module, and the rotation angle of the follow-up control module is recorded each time; the rotation angle of the door leaf is measured and recorded each time; the rotation angle of the door leaf is measured and recorded each time, the rotation angle of the door leaf each time is compared with the corresponding rotation angle of the follow-up control module, the door leaf angle and the follow-up control module angle are segmented according to the preset value by using a mathematical software tool, and a mathematical model of the corresponding relationship equation Y=KX+B between the door leaf angle and the follow-up control module angle is fitted; the corresponding relationship between the door opening angle and the reducer rotation angle can be accurately obtained, and the control of the door opening angle is convenient and accurate.

The invention provides a transient loading waveform optimization method and device based on an impact response spectrum and a medium, and belongs to the field of device verification simulation, and the method comprises the steps: constructing an initial mathematical representation model of a transient loading waveform according to preset initial parameters, generating a mathematical framework according to engineering requirements, and constructing a mathematical representation model of the transient loading waveform; calculating the mathematical framework in the search space, obtaining a candidate parameter set in decision variables, processing the candidate parameter set through an initial mathematical representation model to obtain an initial acceleration signal, and optimizing the initial acceleration signal through a preset genetic algorithm to obtain a transient loading waveform. According to the scheme provided by the invention, a'design-simulation-verification 'full-process intelligent closed-loop system is constructed, a recursive digital filter core algorithm and a dynamic step size control strategy are deeply integrated by relying on third-party mathematical software, a three-level grading strategy is implemented by frequency domain calculation, and a double-threshold error monitoring mechanism is combined, so that large-scale population efficient evolution is realized.

The invention belongs to the technical field of vibration absorber analysis, and particularly relates to a vibration absorber characteristic identification method based on simulation modeling analysis. Comprising the steps of establishing a magnetic circuit equation and an electromagnetic force mathematical model; establishing a finite element simulation model, and obtaining an electromagnetic analysis equation set based on a finite element differential equation; establishing a totally-enclosed magnetic circuit model, determining corresponding parameters, and performing section current on an electromagnetic loop; determining an electromagnetic force differential expression according to the electromagnetic force mathematical model; analyzing by utilizing finite element simulation or mathematical software, determining motion parameters, and solving a dynamic characteristic relationship under the finite element simulation model of the permanent magnet vibration absorber; according to vibration characteristic parameter analysis of the electromagnetic vibration absorber based on a finite element simulation model, characteristic analysis and processing of the permanent magnet vibration absorber are achieved under the condition that complex operation processing does not need to be carried out, so that corresponding characteristic change data can be rapidly obtained in the design and optimization process, the design flexibility is improved, and the design cost is reduced. The problems of large operation processing workload and high application cost of a traditional scheme are avoided.