12 results about "Bi-isotropic material" patented technology

This application provides a data processing method, system, device, and storage medium to improve the accuracy of VTI (Volatile Inductively Coupled Tilt) medium detection. It analyzes data collected from a physical model, selects anisotropic VTI materials, prepares a physical model, and detects the differences between anisotropic and isotropic materials. This invention utilizes the convenience of physical models to obtain seismic wavelets at different layers during physical model acquisition, as wavelets change with propagation distance. Finally, the data is layered to eliminate wavelet influence, thereby improving data resolution. After data processing, the phase axis becomes finer, and the resolution is stronger. In particular, the phase axis of the target layer shown in the black dashed rectangle perfectly represents the top and bottom information, greatly advancing the subsequent determination and detection of anisotropic parameters. The differences between anisotropic and isotropic materials are more obvious and prominent.

The invention provides an electro-optical modulator and an optical module, the electro-optical modulator can comprise a waveguide, an electrode and an anisotropic structure, and the anisotropic structure is arranged between the electrode and the waveguide; the anisotropic structure has a first refractive index in a direction perpendicular to a connection interface of the waveguide and the anisotropic structure, the waveguide has a second refractive index, and the first refractive index is smaller than the second refractive index. Generally, the waveguide is made of an isotropic material, the connection interface of the waveguide and the anisotropic structure is the connection interface of the isotropic structure and the anisotropic structure, and the first refractive index is smaller than the second refractive index, so that a carrier optical signal in the waveguide can be totally reflected when incident to the connection interface, and the optical signal can be transmitted to the isotropic structure. Therefore, lateral diffusion of an optical field in the waveguide can be improved, and the carrier optical signal is prevented from being incident to the surface of the electrode, so that loss of the carrier optical signal is avoided, the transmission power and transmission quality of the carrier optical signal in the waveguide are improved, and the data transmission effect is improved.

The application provides a method for reducing and controlling the sound wave impedance of isotropic material, belongs to the technical field of material sound wave impedance, and solves the problem of difficulty in detecting gas characteristics.The technical scheme comprises the following steps: step one, selecting isotropic material;step two, obtaining the motion equation of the isotropic material;step three, using a plane wave to solve a differential equation, and obtaining the sound wave impedance Z of the material according to a sound wave impedance definition formula;step four, rotating a vector Omega = {0, eta omega, 0} to represent rotating the material along an x2 axis, and rotating a vector Omega = {0, 0, eta omega} to represent rotating the material along an x3 axis;step five, changing the sound wave impedance of the material under the condition of rotating the axis.The beneficial effects of the application are as follows: the application can introduce the Coriolis force caused by rotation into the motion equation of the isotropic material, find the relationship between the sound wave impedance and rotation, and use rotation to reduce and control the sound wave impedance.

A head-up display system including a polarizing optical engine and a first rotatable diffuser is provided. The polarizing optical engine is configured to provide a polarized image beam. The first rotatable diffuser is disposed on a path of the polarized image beam and configured to rotate when the polarized image beam passes through the first rotatable diffuser. The first rotatable diffuser is made of isotropic material, and the polarized image beam from the first rotatable diffuser obliquely strikes a windshield and is then reflected by the windshield to an eye of a user.

The invention discloses a transition radiation polarized wave regulation and control method and system based on an isotropic material. The regulation and control method comprises the following steps: calculating an equivalent current according to an oblique incidence electronic pulse velocity vector and converting the current into a frequency and wave number space; calculating an electron radiation field equation and an interface radiation field equation according to the Maxwell equation set; solving the electron radiation field equation and the interface radiation field equation to obtain an electron radiation field and an interface radiation field; adopting a phase matching algorithm to calculate a total field on two sides of the regulation and control material interface; calculating a transverse magnetic wave far-field radiation angular spectrum and a transverse electric wave far-field radiation angular spectrum excited during electron incidence by adopting boundary phase matching; and regulating and controlling the separation of the transition radiation polarized waves in space according to the relationship between the calculated energy angular spectrum spatial distribution of the transition radiation field and the incident angle of the electronic pulse and / or the electromagnetic parameters of the regulation and control material. According to the invention, the problem that excitation of different modes of transition radiation waves and separation of different modes of radiation fields in space are difficult to autonomously regulate and control in the prior art is solved.

The invention discloses a method and a device for simulating II-type crack propagation of conventional state near-field dynamics by introducing a key rotation angle, and belongs to the technical field of material structural mechanics and computational mechanics. In order to solve the problem that the II-type crack propagation process of an isotropic material under shear deformation is difficult to accurately simulate in the prior art, key rotation angle parameters are introduced into a conventional state near-field dynamic model, and a failure judgment criterion based on a critical deflection angle is established; therefore, dynamic simulation of mass point interaction and fracture behaviors under shear deformation is realized. Determining crack initiation and expansion paths by calculating key rotation angles and key deflection characteristics among mass points; and solving the improved near-field dynamic motion equation in combination with a self-adaptive dynamic relaxation method to obtain the crack propagation process of the material at different time steps. The method and the device are suitable for material fracture mechanical analysis and structure safety evaluation, and can provide theoretical support for structure failure prediction and optimization design of material crack resistance in the engineering field.

An electro-optic modulator (22) and an optical module (m1). The electro-optic modulator (22) comprises a waveguide, electrodes and anisotropic structures (1), wherein the anisotropic structures (1) are arranged between the electrodes and the waveguide; and in a direction perpendicular to a connection interface between the waveguide and each anisotropic structure (1), each anisotropic structure (1) has a first refractive index, and the waveguide has a second refractive index, the first refractive index being less than the second refractive index. In general, the waveguide is made of an isotropic material, so the connection interface between the waveguide and each anisotropic structure (1) is a connection interface between an isotropic structure and said anisotropic structure (1). Since the first refractive index is less than the second refractive index, a carrier optical signal in the waveguide undergoes total reflection when being incident onto the connection interface, thereby improving the lateral diffusion of an optical field in the waveguide, preventing the carrier optical signal from being incident onto the surface of the electrode, which would cause the loss of the carrier optical signal, improving the transmission power and transmission quality of the carrier optical signal in the waveguide, and improving the effect of data transmission.

An example embodiment includes: obtaining a first relation between a global stiffness matrix, a global displacement vector, and external forces applied to a physical structure comprising one or more types of materials; determining a second relation between structural geometry of the physical structure, anisotropic and isotropic material phases in the physical structure, a stiffness of the physical structure, and a plurality of densities and volumes for each of the material phases; providing, to an optimization solver application, the first relation, the second relation, and instructions to determine values of the structural geometry and the anisotropic and isotropic material phases that simultaneously maximize the stiffness and minimize the volumes while maintaining the levels of stress tolerance in presence of the external forces; and receiving, from the optimization solver application, the values of the structural geometry and the anisotropic and isotropic material phases.

The invention provides a material microscopic mechanical property characterization method and system based on inclined section geometric mapping, and relates to the technical field of material microscopic property characterization. Comprising the following steps: acquiring a to-be-detected sample of a to-be-detected isotropic material, and preparing an oblique section with an inclination angle theta; presetting a first judgment condition and a second judgment condition; carrying out Vickers hardness test on the oblique section to obtain a test indentation, judging whether the test indentation meets a first judgment condition or not, and if not, reducing the inclination angle theta of the oblique section; respectively carrying out hardness test on the vertical section and the oblique section of the to-be-tested sample at the same depth position to obtain a hardness test difference value, judging whether the test difference value meets a second judgment condition or not, and if not, reducing the inclination angle theta of the oblique section; and acquiring performance gradient data of the isotropic material to be tested by using the oblique section meeting the requirement, so as to realize microscopic performance gradient characterization of the isotropic material to be tested. According to the invention, accurate capture of submicron gradient features is realized.

The present application belongs to the technical field of structural topology optimization, and discloses a self-adaptive isometric topology optimization design method and device for shell structures, which comprises the following steps: S11, constructing a parameterized model based on the material parameters of the shell structure to be optimized and the truncated hierarchical B-spline basis function, and then discretizing the displacement field of the shell structure based on the parameterized model to obtain the displacement of each point of the shell structure; S12, constructing a topology optimization model of the shell structure to be optimized based on the isotropic material penalty method of the complete self-adaptive strategy, and performing topology optimization design on the shell structure to obtain the density design variable and active element distribution of the iteration step; S13, using the complete self-adaptive strategy to locally refine and coarsen the hierarchical grid of the shell structure to be optimized according to the maximum change of the density design variable of the continuous two iteration steps and the density difference of the adjacent active elements, and then completing the self-adaptive isometric topology optimization design of the shell structure. The present application improves the precision and efficiency.

A multi-material structure includes: a structural member that includes an isotropic material and at least one open-cell void formed in the isotropic material; and a skin that includes a polymetric material and is disposed on a surface of the structural member and within the at least one open-cell void.

Apparatus and methods for adjusting the magnetic field distribution in magnets, particularly magnets with fields transverse to the access geometry into the magnet. The passive shim apparatus magnetically soft and isotropic materials in a generally tubular shape, positioned in the magnetic field so that the axis of the tube is perpendicular to the field direction. The method for designing the passive shim utilizes an association between basis patterns of shim material and the fields the patterns create.