5results about How to "Simplify the solution process" patented technology

The distributed active fault-tolerant control method of four-wheel steer-by-wire system relates to the field of four-wheel steer-by-wire system control of automobile, which determines the ideal automobile yaw angular velocity and mass center side slip angle of four wheels through a reference model; determines the real-time yaw angular velocity and mass center side slip angle of four wheels through a four-wheel yaw angular velocity and mass center side slip angle calculation module; determines the weighted adjacent matrix, degree matrix and Laplace matrix of four wheels through a four-wheel intelligent agent information exchange topological structure module; solves out the four-wheel steering angle of automobile under the condition of known / unknown actuator fault through a distributed active fault-tolerant control module of four-wheel steer-by-wire system; realizes the yaw stability control of automobile through a CarSim automobile model, and outputs the real-time motion state information of automobile. The application effectively balances the calculation efficiency and vehicle stability performance, and improves the safety and stability of four-wheel steer-by-wire system under the condition of actuator gain variation fault, constant deviation fault and stuck fault.

The application discloses a kind of configuration optimization method, device and system of integrated hydrogen production system, belong to hydrogen production technical field, the integrated hydrogen production system configuration optimization method provided by the present application, the two-stage configuration model of integrated hydrogen production system considering the uncertainty of photovoltaic output and biomass water content is established, the objective function is set as the minimization of investment cost and the operating cost of the worst scenario corresponding to the uncertainty set;Solve the above two-stage configuration model to obtain the optimized configuration scheme, thereby improving the robustness of configuration to ensure smooth hydrogen production.The scheme can ensure smooth hydrogen supply while meeting the system carbon emission requirements under photovoltaic, biomass access, reduce system component investment.In addition, the technical parameters involved therein relate to hydrogen production components and energy storage components, and the key parameters affecting the configuration results of system hydrogen production and energy storage can be subjected to sensitivity analysis.

The application belongs to the technical field of spectral image, and discloses a convolution sparse coding compressive sensing spectral reconstruction method and system, which comprises the following steps: step S1, constructing a reconstruction equation based on convolution sparse representation by using an observation image output by a spectral acquisition system and an observation matrix of the spectral acquisition system; step S2, performing low-frequency solving on the image based on the reconstruction equation to obtain preliminary three-dimensional spectral data; step S3, performing constraint solving on a high-frequency part of the image based on the preliminary three-dimensional spectral data to obtain sparse coefficients of a convolution kernel at an Lth waveband; step S4, performing convolution summation on the sparse coefficients and the convolution kernel to obtain three-dimensional spectral data; and step S5, outputting the three-dimensional spectral data meeting a condition to obtain reconstructed spectra. The generalization, accuracy and timeliness of the reconstructed image are all good.

The application relates to a traffic flow basic map drawing method and device based on ship displacement and a medium. After initial data is acquired and preprocessed, ship feature data is extracted, the ship displacement is calculated, and the driving distance and time of different ships are corrected; based on the driving distance of different ships and the corresponding ship displacement in a selected period, the ship traffic flow rate in a full space-time region is calculated; based on the driving time of different ships and the corresponding ship displacement in a selected voyage section, the ship traffic flow density in the full space-time region is calculated; based on the ship traffic flow rate and the ship traffic flow density, the ship traffic flow speed is calculated; based on the ship traffic flow rate, the density and the speed, the ship traffic flow basic map is drawn; and the full space-time region is determined by the selected period and the selected voyage section. Compared with the prior art, the application has the advantages of improving the accuracy of key parameters of ship traffic flow, the authenticity of the traffic flow basic map and the like.

This invention belongs to the field of hypersonic aerodynamics and discloses a method for predicting hypersonic boundary layer transition based on the numerical solution of the frequency domain Navier-Stokes equations. This method, through the assumption of small perturbations, linearly decomposes the hypersonic flow field into a steady flow field and a perturbed flow field. It eliminates the time differential terms in the time-domain Navier-Stokes equations using complex decomposition, transforming the time-domain Navier-Stokes equations into linear algebraic equations in complex space, thereby simplifying the solution and analysis of the time-domain Navier-Stokes equations. Specifically, it includes three stages: preprocessing, solver, and post-processing. The iterative solution of the frequency-domain Navier-Stokes equations in the solver is the core, including spatial discretization of the frequency-domain Navier-Stokes equations, iterative progression, implementation of boundary conditions, parallel data exchange, convergence judgment, and result output. The hypersonic boundary layer transition prediction method based on the numerical solution of the frequency-domain Navier-Stokes equations of this invention can balance computational efficiency and accuracy, and has practical engineering value.