9 results about "Transfer equation" patented technology

The invention discloses a radar target tracking method based on transport mapping, which adopts a pulse-by-pulse estimation strategy and comprises the steps of initial construction, initial particle generation and pulse-by-pulse updating. A target transfer equation and a radar measurement equation are initially constructed, and an equal-weight particle set is generated to represent initial probability distribution. And at each pulse moment, predicting a target state by using a transfer equation, calculating a measurement predicted value, carrying out downsampling on a high-dimensional measurement signal and the predicted value, constructing transport mapping and updating particles based on state prediction and downsampling data to obtain a posterior state set, and finally solving an average output target state estimated value. The method solves the problem of calculation complexity of particle degradation and high-dimensional measurement data processing in an existing method, improves the target state estimation precision and tracking efficiency, and is especially suitable for a complex nonlinear and high-noise environment. According to the method, high-dimensional measurement data and multi-modal distribution can be processed, particle degradation is avoided, real-time performance and robustness are enhanced, and the method has important application value.

The invention belongs to the technical field of grid-connected inverter harmonic analysis, and particularly discloses a grid-connected inverter harmonic closed-loop transmission analysis method and system considering broadband coupling. The method comprises the following steps: respectively establishing a harmonic component transfer function of each module; based on the harmonic component transfer function of the sampling module, calculating to obtain harmonic active power and harmonic reactive power input to the power outer loop control module; based on a harmonic component transfer function of the power outer loop control module, calculating to obtain a harmonic current component in a reference current signal output by a power outer loop; based on a harmonic component transfer function of a current inner loop control module, obtaining a three-phase modulation voltage harmonic component and an inverter port voltage harmonic component through coordinate inverse transformation; on the basis of the inverter port voltage harmonic component, a main circuit harmonic transfer equation is combined, and a grid-connected point harmonic current component is obtained through calculation; the method overcomes the defects that a traditional analysis method cannot consider the control of a whole loop by a closed loop, and the broadband coupling is insufficiently considered.

The present invention discloses a radar target tracking method based on transport mapping, which adopts a pulse-by-pulse estimation strategy, including initial construction, initial particle generation and pulse-by-pulse update steps. The target transfer equation and radar measurement equation are initially constructed to generate an equal-weighted particle set to represent the initial probability distribution. At each pulse moment, the transfer equation is first used to predict the target state and calculate the measurement prediction value, the high-dimensional measurement signal and the prediction value are downsampled, and then the transport mapping is constructed based on the state prediction and downsampled data, the particles are updated to obtain the posterior state set, and finally the average output target state estimate is calculated. This method solves the problems of particle degradation and computational complexity of high-dimensional measurement data processing in existing methods, improves the target state estimation accuracy and tracking efficiency, and is particularly suitable for complex nonlinear and high-noise environments. This method can process high-dimensional measurement data and multimodal distributions, avoid particle degradation, enhance real-time and robustness, and has important application value.

The application discloses a MEMS damage mode rapid analysis method and system, and aims to solve the problems that a traditional MEMS mode analysis method is difficult to truly reflect the influence of service damage, or the calculation cost of full model damage analysis is too high. The method comprises the following steps: performing high-fidelity damage evolution simulation on a MEMS structure; performing CB mode reduction of a damage beam and constructing a transfer matrix; performing multi-body system discretization and constructing a MEMS system transfer equation; and solving the vibration characteristics of the MEMS system. Through a series of mutually supporting technical steps, the application systematically solves the core contradiction existing in the MEMS damage mode analysis in the prior art, and brings substantial progress and beneficial effects in the aspects of physical reality, calculation efficiency, method universality and engineering practicability.

The present invention discloses a method for identifying dynamic loads on nonlinear structures based on an improved particle filter. The method comprises the following steps: Step 1: establishing a state (displacement and velocity) transfer equation and an observation equation for a nonlinear structural system; Step 2: establishing a time-discretized state transfer equation and observation equation for the nonlinear system containing process noise; Step 3: given an initial value and variance value of a state vector, establishing an improved particle filter based on a particle filter and a weighted least squares method, wherein the weighted least squares method is used for load identification and the particle filter is used for state identification; Step 4: continuously identifying the load and system state using the improved particle filter based on the real-time measured dynamic acceleration response of the structure. This method is particularly suitable for dynamic load identification of nonlinear structures in the presence of non-Gaussian noise.

The present application belongs to the technical field of grid-connected inverter harmonic analysis, and specifically discloses a grid-connected inverter harmonic closed-loop transfer analysis method and system considering wideband coupling; the method comprises the following steps: respectively establishing harmonic component transfer functions of each module; based on the harmonic component transfer functions of the sampling module, the harmonic active power and the harmonic reactive power input to the power outer loop control module are calculated; based on the harmonic component transfer functions of the power outer loop control module, the harmonic current component in the reference current signal output by the power outer loop is calculated; based on the harmonic component transfer functions of the current inner loop control module, the three-phase modulation voltage harmonic component and the inverter port voltage harmonic component are obtained through coordinate inverse transformation; based on the inverter port voltage harmonic component, combined with the main circuit harmonic transfer equation, the grid-connected point harmonic current component is calculated; the present application overcomes the defects of the traditional analysis method, such as the inability to consider the full loop of closed-loop control and the insufficient consideration of wideband coupling.

The present invention relates to the field of robotic cutting technology, resolving the technical issues faced by conventional methods for calculating frequency response functions, such as high cost, cumbersome operation, and limited adaptability to dynamic changes. The invention particularly relates to a method for calculating the frequency response function of a robotic cutting system, comprising the following steps: establishing a dynamic model of the robotic cutting system and its topological diagram based on a multi-body system transfer matrix method; deriving the complex-expanded transfer equations and complex-expanded transfer matrices for each element in the dynamic model; and deriving the complex-expanded total transfer equation and complex-expanded total transfer matrix of the robotic cutting system based on the dynamic model, its complex-expanded transfer equations and complex-expanded transfer matrix, and its topological diagram. The present invention can rapidly obtain the desired frequency response function without sacrificing accuracy, enabling real-time monitoring and immediate optimization of robotic cutting, and making dynamic characteristic analysis of robotic cutting more economical and efficient.

The invention discloses an acoustic black hole structure sound radiation calculation method based on a hybrid method of a reduced multi-body system transfer matrix method and a surface element method. Based on a reduced multi-body system transfer matrix method, establishing a total transfer equation of a combined system formed after the main structure is additionally provided with the acoustic black hole dynamic vibration absorbers, and solving the total transfer equation to obtain a steady-state response of the total transfer equation; and solving the radiation sound power of the main structure in the semi-infinite space by combining a surface element method and utilizing the speed distribution of the main structure. The method has the advantages of being high in calculation speed, flexible in modeling and wide in applicability when the acoustic radiation of the acoustic black hole dynamic vibration absorber and main structure combined system is calculated.

The invention provides a transmission system dynamics analysis method based on a finite element transfer matrix method, relates to the technical field of finite element analysis, and solves the technical problem that in the prior art, an energy method, a finite element method and the like are difficult to model for transmission assemblies with various types and complex structures. According to the scheme, the method comprises the steps of modeling based on transmission system component multi-physics field coupling, modeling of a component dynamic model based on a finite element-transfer matrix method, modeling of a transmission system dynamic model, quoting boundary conditions to a transmission system total dynamic transfer equation to obtain a characteristic frequency equation of a transmission system, and solving to obtain an analysis result. On the premise that the precision equivalent to that of a traditional FEM is kept, the calculation efficiency is improved by nearly 8000 times, and the method is more suitable for real-time simulation and system-level optimization of transmission system engineering.