5 results about "Vector potential" patented technology

The application provides a kind of electromagnetic field fast prediction method and system of maglev train suspension electromagnet, for the coil strong source of suspension electromagnet under typical working condition, nonlinear constitutive of iron core and local high gradient multiscale coupling problem, based on electromagnetic field sample data extraction coil area and construct distance field, according to the structure characteristics of suspension electromagnet and the distance field, the solving area of electromagnet is divided into coil conductor subdomain and multiple iron core subdomains of different distance levels, and subnetwork is respectively constructed.In the training process, the residual error of Maxwell quasi-static equation and the consistency constraint of material constitutive are introduced in the subdomain, the magnetic vector potential continuity and the normal continuity constraint of magnetic induction intensity are applied on the interface of subdomain;Further introduce the time-varying mixed scheduling mechanism of the right end source term of iron core subdomain, to improve the prediction stability and precision of strong source area and high gradient area.In the reasoning stage, the electromagnetic field distribution can be quickly output, and support is provided for fast calculation of electromagnetic force, eddy current loss, etc.

The application discloses a transformer core winding vibration model construction method considering spatial effect. By comprehensively considering the uneven distribution of spatial magnetic field and the structure factors of the transformer, a vibration model capable of accurately reflecting the vibration coupling relationship between the transformer core and the winding is provided. By adopting the magnetic vector potential method, the leakage magnetic field distribution and the electromagnetic force in the three-dimensional region of the winding wire cake are calculated, and the distribution influence of the leakage magnetic field on the electromagnetic force of the winding is simulated and accurately reflected in combination with the core window effect. By applying the vibration coupling between the windings at all levels and the pre-tightening force to the unified mass-spring-damping model, the winding space dynamics model is constructed in combination with the number of interlayer spacers of the winding, and the constraint condition that the vibration phases of the interlayer windings are synchronous can be embodied in the simulation process. The method can guarantee the calculation precision and reduce the calculation cost.

This application proposes a design method for a vehicle-mounted adaptive antenna. This method uses the metal of the vehicle body as the main radiating element of the antenna. Based on the method of moments (MoM), it starts with the magnetic vector potential, calculates the magnetic field, and then uses the magnetic field to calculate the electric field. Finally, it uses Ampere's law from Maxwell's equations to obtain a wave equation based on the magnetic vector potential. The integral relationship between the electric field and the surface current is solved using the wave equation. By observing the surface current distribution and radiation pattern on the vehicle body structure, modes that meet the coverage and feeding requirements are identified, and these modes are excited by feeding. Alternatively, in cases requiring broadband design, excitation can be added to multiple regions with similar surface current distributions to achieve simultaneous excitation of multiple modes, thus realizing a broadband mode antenna design. Since the main radiating element of this antenna is the metal structure of the vehicle body, it has advantages such as ease of implementation, low cost, simple structure, and no space occupation within the vehicle.

This invention provides a numerical simulation method for magnetotellurics under the Lorentz specification. The Maxwell equations are transformed into a set of governing equations consisting only of vector potentials using the Lorentz specification. A two-dimensional Fourier transform is performed on the quadratic vector potential governing equations in the horizontal direction, converting the three-dimensional governing equations into one-dimensional governing equations, reducing computational load and storage requirements, and improving computational efficiency. The Fourier transform can employ the standard Fourier transform algorithm, the offset sampling Fourier transform algorithm, or the non-uniform sampling Fourier transform algorithm. Then, the one-dimensional equations are solved using the one-dimensional finite element method with quadratic interpolation shape functions, resulting in three pentagonal equation sets, which are then solved using the pursuit method. This invention offers fast computation speed and small memory footprint, providing a new method for efficient and high-precision numerical simulation of large-scale magnetotellurics.