28 results about "Theoretical models" patented technology

This invention discloses a method, device, and medium for simulating biomagnetic field measurement results. The method includes: determining a corresponding theoretical model based on the properties of the biomagnetic field to be simulated; simulating the biomagnetic field using the theoretical model to obtain a simulated biomagnetic field; acquiring the index parameters of a measuring instrument; and simulating the biomagnetic field based on the index parameters of the measuring instrument to obtain simulated measurement results. This invention solves the problem that traditional biomagnetic field simulations do not consider the influence of the performance and technical specifications of the measuring instrument itself on the biomagnetic field measurement results. It can more realistically and directly simulate the results of measuring biomagnetic fields using different measuring instruments, considering the influence of the technical specifications of the measuring instrument on the biomagnetic field measurement results from multiple dimensions.

This invention relates to a high-precision, cost-effective method for manufacturing open, curved integral thin-shell shells, belonging to the field of advanced manufacturing. It solves the problem that existing methods struggle to simultaneously achieve low cost, high efficiency, and high precision when manufacturing open, curved integral thin-shell shells. The method includes the following steps: S1, establishing a theoretical model of the thin-shell; S2, performing finite element simulation of subsequent assembly processes on the thin-shell; S3, performing finite element simulation of the mold during heating; S4, digitally unfolding the reconstructed thin-shell model to obtain an accurate planar unfolded model of the thin-shell. This invention, through multiple key steps such as thin-shell reconstruction, mold reconstruction and / or differential temperature design, and conversion of the three-dimensional thin-shell model into a planar unfolded model, can effectively improve the manufacturing efficiency of thin-shell shells, shortening the processing cycle by more than 75%; reducing costs by more than 80%; and improving the precision of thin-shell manufacturing, with product surface accuracy reaching the order of 0.3mm / 1000mm.

This invention relates to the fields of atmospheric physics and remote sensing, and particularly to a method and system for obtaining upward atmospheric transmittance in the infrared absorption band. The method includes: directly measuring solar spectral data from the ground; simultaneously measuring atmospheric composition profiles in the directions of the sun and satellite; calculating the downlink measured transmittance based on the measured data; calculating the downlink and uplink theoretical transmittance based on the profiles using a radiative transfer model; comparing the downlink measured and theoretical transmittance to verify errors; calculating a correction coefficient based on the uplink and downlink theoretical transmittance; and using this correction coefficient to correct the downlink measured transmittance to obtain the final uplink atmospheric transmittance. The system includes spectral measurement, profile measurement, and data processing units for implementing the above method. This invention combines the high precision of direct measurement with the physical extrapolation capability of theoretical models, solving the problem of obtaining high-precision uplink atmospheric transmittance and providing a reliable technical solution for satellite remote sensing calibration.

The application discloses a kind of theoretical model for evaluating pipeline steel macro-battery corrosion under elastic-plastic deformation, the theoretical model includes following physical field and coupling mechanism thereof: physical field: (1) stress-strain field: the elastic-plastic mechanics constitutive model based on von Mises yield criterion and isotropic hardening criterion is used to characterize the mechanical behavior of pipeline steel;(2) electrochemical field: the electrode kinetics model based on Tafel equation is used to characterize the corrosion reaction kinetics process on the surface of pipeline steel;Coupling mechanism: the mechanical-electrochemical double-path coupling mechanism for characterizing macro-battery corrosion.The model realizes the quantitative description of the macro-battery corrosion behavior induced by elastic-plastic deformation by coupling the mechanical deformation and electrochemical corrosion process of the material.The application realizes the two-way interaction of stress-strain field and electrochemical field under the background of macro-battery corrosion, and can quantitatively reveal the regulation of deformation on the intensity and evolution process of macro-battery corrosion.

The application discloses a kind of ferrite gyromagnetic nonlinear loss transient response theoretical model and parameter simulation method under vertical pumping configuration, belong to microwave technical field, including the following steps: obtaining ferrite material parameters and target excitation microwave signal parameters, signal parameter at least includes microwave signal frequency, pulse width tau;Pulse width dependent function for representing consistent precession magnetic moment and the coupling strength of non-consistent precession magnetic moment (spin wave) is constructed.In view of this, the application first establishes the quantitative relationship model between the excitation microwave pulse width tau and the nonlinear loss excitation threshold (tau) in the theoretical framework of vertical pumping configuration, establishes the quantitative relationship model between the excitation microwave pulse width tau and the nonlinear loss excitation threshold (tau).The model can accurately describe the nonlinear effect of ferrite under nanosecond transient pulse excitation, and the dynamic law of the excitation condition and the change of pulse width.For the design of ferrite limiter device facing high-power microwave electromagnetic environment, important theory and design basis are provided.

This application relates to an adaptive correction method and system for flow measurement parameters in approximate standard open channels. The method constructs a basic flow model based on the target channel design parameters, and calculates the theoretical basic flow based on water depth and water level difference. Under different operating conditions, water depth, water level difference, and corresponding high-precision reference flow are collected to obtain the theoretical basic flow. The channel is then divided into several water depth intervals according to the water depth range, and a dynamic correction function for each interval is fitted based on the calibration data of each interval. During operation, real-time water depth and water level difference are collected, and the real-time theoretical basic flow is obtained using the basic flow model. Then, the target interval is selected according to the current water depth, and the corresponding dynamic correction function is called for correction to obtain the actual flow, which is then output. This application effectively reduces the system deviation between the theoretical model and actual operating conditions without increasing the complexity of hardware, achieving high-precision flow measurement under different water depths and water level differences, and improving the accuracy and applicability of flow measurement.

This invention discloses a method for modeling non-ideal surfaces of complex curved parts based on quasi-conformal mapping, belonging to the technical field of complex curved part modeling. The method includes: constructing an initial manufacturing deviation field by calculating the normal distance between each node of the theoretical model surface and the corresponding measured point cloud data; unfolding the developable surface region of the part surface to a two-dimensional plane, and mapping the non-developable surface region to a two-dimensional rectangular domain based on quasi-conformal mapping; obtaining the mapped manufacturing deviation field; performing discrete cosine transform mode decomposition to identify and retain key deviation modes that meet preset energy compaction requirements, and reconstructing them through inverse discrete cosine transform to obtain the reconstructed mapped deviation field; and mapping the reconstructed mapped deviation field back to the original three-dimensional surface of the part through quasi-conformal inverse mapping to construct the non-ideal surface model of the part. This invention achieves high-fidelity modeling of the surface of composite parts containing complex curved surfaces, improving the reliability of assembly accuracy prediction.

This invention discloses a method for establishing a phase-field model of a polycrystalline phase relaxor ferroelectric, the method comprising the following steps: 1. Determining the free energy of the polycrystalline phase relaxor ferroelectric; 2. Determining the order parameter of the polycrystalline phase relaxor ferroelectric as spontaneous polarization. P i 3. Represent free energy as spontaneous polarization P i The invention employs several methods: 1) introducing ferroelectric-ferroelectric phase boundaries and random local electric fields; 2) solving the Ginzburg-Landau partial differential equations to obtain the spatial evolution of spontaneous polarization, thereby determining the domain structure of polycrystalline relaxed ferroelectrics and ultimately establishing a phase-field model for polycrystalline relaxed ferroelectrics. Based on a model ferroelectric system, this invention, by considering ferroelectric-ferroelectric phase boundaries and random local electric fields, reproduces the unique domain structure characteristics of polycrystalline relaxed ferroelectrics with the coexistence of multiple nanometer-sized ferroelectric phases, establishes a phase-field model for polycrystalline relaxed ferroelectrics, and improves the theoretical model of polycrystalline relaxed ferroelectrics, which is beneficial for guiding the design of novel high-performance ferroelectric materials.

This invention discloses a segmented, pre-assembled, closed-loop compensation method for large steel structures, comprising: establishing a unified spatial reference on an assembly platform; deploying multiple supporting fixtures adapted to the main body segments; hoisting multiple main body segments onto the supporting fixtures; performing preliminary positioning and splicing based on the spatial reference to form a preliminary frame of the large steel structure; acquiring actual three-dimensional coordinate data of the docking interfaces of adjacent main body segments on the preliminary frame based on a unified measurement reference; calculating the measured distance between adjacent interfaces based on the actual three-dimensional coordinate data and comparing it with the theoretical distance in the theoretical model; determining the compensation dimension of the transition section based on the difference between the two; processing the transition section in the factory according to the compensation dimension; and assembling the processed transition section with the corresponding main body segment to form the final overall frame. This invention transforms static prevention into dynamic closed-loop compensation, effectively mitigating assembly risks by moving them forward to the factory, thus ensuring the long-term safety of the structure.

The application discloses a kind of nuclear fusion star simulator magnet coil curvature deformation precision scanning measurement device and method, belong to nuclear fusion device precision measurement technical field.Device includes pedestal, support column, outer ring frame, rotary motor sliding seat, radial adjusting rod, main measurement scanning ring probe, center shaft and auxiliary measurement arm;The star simulator magnet coil to be measured is installed in the inside of outer ring frame, rotary motor sliding seat is slid along the circumference of outer ring frame 360 °, radial adjusting rod drives measurement probe to realize radial precision feed, and the supplementary measurement of complex area of coil is completed.Method is realized by establishing unified measurement coordinate system, and three-dimensional point cloud data are collected by full circumferential continuous scanning, and curvature deformation deviation report is generated by curve reconstruction, curvature calculation and comparison with theoretical model.The application solves the problems of low efficiency, insufficient accuracy and inability to continuously scan in full circumferential direction of traditional measurement methods, and the measurement accuracy reaches sub-micron level, providing data support for coil manufacturing, assembly and operation and maintenance.

This invention discloses a method for predicting the impact of sonar baffles on sonar array elements based on the virtual source method. The method includes: establishing an equivalent theoretical model; simplifying the scattering problem of the equivalent theoretical model into a multiple scattering problem between two infinitely long rigid cylinders; deriving an analytical expression for the scattered sound pressure on the surface of the infinitely long rigid cylinders; calculating the theoretical analytical solution for the scattered sound pressure on the cylinder surface; establishing a finite element model of the two infinitely long rigid cylinders and using the model to solve for the scattered sound pressure on the cylinder surface; comparing the model solution with the theoretical analytical solution to verify the correctness and effectiveness of the analytical expression; changing the cylinder size and the distance between the cylinder and the baffle, comparing the calculation results with the case without a baffle, and analyzing the effect of the baffle on the scattered sound pressure on the cylinder surface. This invention ensures computational accuracy while possessing a clear physical mechanism and high computational efficiency, thus providing a reliable research basis and theoretical support for evaluating the impact of sonar baffles on sonar array elements in practical engineering.

The present application relates to the field of three-dimensional optical precision measurement, and discloses a three-dimensional profile measurement method for the inner cavity surface of a purple sand pot based on optical measurement. The method constructs a multi-band spectral light source system, projects a light beam to the inner cavity surface according to a preset sequence of incident angles, and synchronously collects multi-spectral interference fringe images and ambient light noise data. According to the correlation between image distortion and light noise, a surface phase shift atlas is generated, and the measurement area and the occluded area are divided based on phase continuity. Phase unwrapping and geometric calculation are performed on the complete area to generate an initial three-dimensional point cloud, the boundary information of the occluded area is fused to complete hole speculation and surface extension, and a preliminary three-dimensional profile model is constructed. The model is registered with a standard theoretical model to generate a surface profile deviation field and output a process analysis report. The present application realizes accurate identification of the occluded area of a complex inner cavity through phase topology analysis, and uses spatial analysis of the deviation field to enable the measurement result to directly guide production process improvement.

The invention discloses a point cloud processing method of a line structured light measurement system facing an electric drive gear, and belongs to the technical field of gear detection and optical measurement. The method comprises the steps that a system is initialized, and a multi-coordinate system conversion relation is established; acquiring original point clouds of the tooth surface and unifying coordinates; analyzing and mapping the three-dimensional point cloud according to the gear geometric model and reducing the dimension to a two-dimensional tooth profile plane; noise points are removed in the two-dimensional plane based on involute fitting and self-adaptive threshold value recognition; and solving an optimal transformation parameter by adopting an iterative optimization algorithm by taking a minimum point to a theoretical tooth surface normal distance as a target so as to realize high-precision registration of the de-noising point cloud and the theoretical model. According to the method, the specific noise in the gear tooth surface point cloud can be removed in a targeted manner, the real tooth shape is effectively protected, the method has the advantages of being accurate in denoising, stable in registration, high in engineering practicability and the like, and the precision and reliability of electric drive gear line structure light detection are remarkably improved.

The present application relates to the technical field of dominant percolation channel identification, in particular to a four-dimensional identification method for dominant percolation channel in thick oil layer. The method mainly solves the problems of large workload, difficult judgment, high cost and low efficiency of the existing methods for identifying dominant percolation channel. The four-dimensional identification method for dominant percolation channel in thick oil layer comprises the following steps: establishing a theoretical model, simulating tracer flow through the theoretical model; injecting different tracer liquids into each injection well around the target well; determining the dominant percolation channel according to the tracer fluid detection results of the target well, and determining the evolution state of the dominant percolation channel according to the identification results of the dominant percolation channel. The four-dimensional identification method for dominant percolation channel in thick oil layer can realize directional and quantitative identification of dominant percolation channel and tracking simulation of dominant percolation channel, reduce cost, improve work efficiency, provide basis for in-layer accurate dynamic analysis and adjustment, and greatly improve recovery efficiency.

This invention discloses an experimental apparatus and method for improving the bearing capacity of suction piles based on expansive materials. The apparatus includes: a loading and hoisting system for vertical / lateral loading and attitude adjustment of the suction pile model; a suction pile and formation simulation system for constructing an ultra-deepwater formation environment and suction pile lowering conditions, and simulating seepage and soil response; and a sensing and monitoring system for acquiring mechanical and hydrological response data in real time, ensuring that the data throughout the experiment is traceable and analyzable. This application obtains a large amount of data through an independently operable experimental apparatus, enabling bearing capacity experiments with different mud layers and different expansive materials. This will promote the continuous improvement of theoretical models, thereby improving the safety, efficiency, and economy of drilling operations.

This invention relates to a manufacturing method for a lightweight, high-load-bearing, complex integral thin-shell, belonging to the field of advanced manufacturing. It solves the problem that existing methods struggle to efficiently, cost-effectively, and precisely manufacture such shells. The manufacturing method includes the following steps: S1, establishing a theoretical model of the thin-shell; S2, performing finite element simulation of subsequent assembly processes to obtain a reconstructed model; S3, designing a manufacturing process scheme based on the reconstructed and theoretical models, including a thin-shell forming scheme and a preform manufacturing process scheme; and S4, manufacturing the thin-shell according to the manufacturing process scheme. This invention, through multiple key steps such as thin-shell reconstruction, thin-shell forming scheme design, and preform manufacturing process scheme design, effectively improves the precision and efficiency of thin-shell manufacturing, achieves precise weight control, enhances the load-bearing capacity of the thin-shell, shortens the processing cycle, and reduces costs.

This invention proposes a GIS disconnector switch status diagnosis and early warning system and method based on dual-position correlation monitoring of the transmission link. The system includes: a first position monitoring unit for acquiring the rotational position information of the crank arm output by the operating mechanism; a second position monitoring unit for acquiring the linear position information of the transmission link connected to the moving contact; and an intelligent analysis terminal. This invention constructs a theoretical transmission correlation model between the crank arm position and the link position, and calculates the correlation deviation between the actual position and the theoretical model in real time, thereby directly diagnosing the internal state of the transmission link. This correlation deviation can reflect latent faults that traditional single-point monitoring cannot detect, such as link loosening, plastic deformation, and pin wear. Simultaneously, based on the trend analysis of historical correlation deviations, early warning of progressive faults is achieved. This invention avoids the simple superposition of existing sensor technologies and provides a novel method for transmission link health diagnosis.

This invention discloses a theoretical model for spiral self-feeding straightening of pipes, including, under the assumption that the rotation axis of the pipe coincides with the bending plane and axial roll of the pipe is ignored, establishing the total kinetic energy of the pipe based on the thin-wall assumption. T The theoretical formula is derived; neglecting the plastic dissipation of the pipe, a simplified potential energy model for the pipe is established based on the unified curvature theorem of reciprocating bending and the bidirectional effect. V The theoretical formula is used to model the motion trajectory of the pipe based on the Lagrange equation, thereby obtaining a set of motion trajectory equations. These equations include the circumferential bending angle of the pipe, the helical azimuth angle of the pipe, and the axial self-feed displacement. s The coupling relationship between them; where the Lagrange equation is, Q q For the generalized forces acting on the pipe, L For Lagrange units, q For a generalized coordinate system, , for q The first derivative.

This invention discloses a method for determining the bearing slippage failure threshold based on state information fusion analysis. First, a bearing twin simulation model is constructed, and the bearing cage slippage rate and stress-strain of each component are measured simultaneously. An improved L-P theory is used to construct a bearing life theoretical model and calculate the corresponding PV value. Second, the bearing cage center-of-mass motion trajectory is measured, and its maximum, minimum, average, and standard deviation are calculated to construct a center-of-mass trajectory fusion index to measure the cage motion stability. Bearing vibration acceleration data is measured, and a bearing life prediction state model is constructed based on the ARMA-transfer learning algorithm. Finally, based on the obtained bearing life theoretical model, PV value, center-of-mass motion trajectory fusion index, and bearing life prediction state model, and combined with fuzzy clustering evidence theory, a bearing state information decision-making layer fusion is performed to determine the bearing slippage failure threshold. This invention enables accurate calculation of the bearing slippage threshold under varying operating conditions.

This invention relates to the field of optical technology, providing an automated design method and apparatus for anti-diffraction pupil filters based on process constraints. The aforementioned automated design method for anti-diffraction pupil filters based on process constraints includes: constructing a mixed spectral parameter space based on the microstructure of the pupil edge, mapping the mixed spectral parameters to a spatial domain edge radial offset sequence; constructing a closed vector graphic based on smooth edge contours, mapping the distance field to a two-dimensional pupil transmittance distribution function; constructing a full-link optical simulation model based on the two-dimensional pupil transmittance distribution function and Fourier scalar diffraction theory; calculating the gradient of the composite loss function with respect to the mixed spectral parameters based on an automatic differential framework, and iteratively updating the parameters using a numerical optimization algorithm. This automated design method for anti-diffraction pupil filters based on process constraints successfully solves the common problem in computational optical design of the disconnect between theoretical models and physical fabrication.

A computer-implemented method for synthesizing spectral data includes the following steps: acquiring a set of spectral data each associating a spectrum with a sample having a given chemical composition, using a spectroscopy method, determining a theoretical model of the distribution of the intensities of the spectrum for each wavelength channel of the spectrum, generating a set of synthetic spectral data by generating, for each wavelength channel of the spectrum, a randomly drawn intensity according to the probability distribution of the theoretical model.

The application discloses a bending robot bending coordinate positioning method. The method comprises the following steps: obtaining three-dimensional coordinates of a deformed workpiece, obtaining denoising point cloud data after denoising, interpolation encryption and filtering processing, and obtaining uniform sampling data set through downsampling; extracting geometric features in the uniform sampling data set, fitting a geometric model and collecting feature parameters, and obtaining effective geometric constraint groups after spatial constraint consistency verification; performing point cloud registration on the effective geometric constraint groups and corresponding features of a theoretical model, and iteratively solving initial pose transformation parameters; constructing a least square target function through matching residuals according to the initial pose transformation parameters, and optimizing to obtain final pose transformation parameters; and performing coordinate transformation on the to-be-positioned point cloud to obtain a final coordinate positioning result. Through coordinate positioning, the application realizes accurate establishment of constraints reflecting the real geometric relationship of the workpiece from the plate point cloud, and realizes high-precision positioning of the deformed workpiece.

A computer-implemented method for synthesizing spectral data, comprising the steps of: Acquiring (110) a set of spectral data, each associating a spectrum with a sample having a given chemical composition, by a spectroscopic method; Determining (130) a theoretical model of the intensity distribution of the spectrum for each wavelength channel of the spectrum; Generating (140) a set of synthetic spectral data (150) by generating, for each wavelength channel of the spectrum, an intensity randomly drawn according to the probability distribution of the theoretical model. Figure 1

A design method for vibration isolation metamaterials with long quasi-zero stiffness plateaus is disclosed. This method first constructs composite beams with long quasi-zero stiffness plateaus using a beam structure. Then, vibration isolation unit cells with long quasi-zero stiffness plateaus are formed by circularly arraying these composite beams. The underlying mechanism is the combination of Euler buckling of the inclined beams and deflection deformation of the crossbeams within the microscopic vibration isolation unit cells. Second, a theoretical model of the effective load of the vibration isolation unit cells is established, quantifying the relationship between the effective load and the geometric design parameters of the unit cells, and performing finite element simulation. Finally, by adjusting the parameters of the inclined beams within the vibration isolation unit cells to prevent mutual interference between the quasi-zero stiffness plateaus, the unit cells are arranged to achieve flexible multi-level vibration isolation performance. The vibration isolation unit cells designed in this invention exhibit quasi-zero stiffness characteristics and low-frequency vibration isolation capabilities over a long displacement range. Stacking these unit cells to construct metamaterials can also achieve flexible multi-level vibration isolation.

This invention discloses a method and system for constructing a specific multibody dynamics model for mechanical systems. The method includes establishing a parameterized model considering multi-source spatiotemporal uncertainties, the model containing variable modeling parameters; performing simulations by changing the parameters, acquiring simulation signals and extracting time-frequency domain features to form sample data; screening parameters to be corrected and key features through saliency analysis, constructing a surrogate model with key features as input and parameters to be corrected as output; collecting measured signals from the actual mechanical system, extracting key features in the same way and inputting them into the surrogate model to obtain the values ​​of the parameters to be corrected, correcting the theoretical model, and repeating the above steps at predetermined time intervals to achieve dynamic updates; through a two-stage mechanism of offline construction of feature-parameter mapping surrogate model and online back-calculation of parameters, complex online solutions are avoided, computational burden is reduced, and model accuracy and real-time performance are improved, making it suitable for dynamic analysis and predictive maintenance of complex mechanical equipment.

The present application belongs to the technical field of shale mechanics analysis, and particularly relates to a hard and brittle shale micro-mechanics performance analysis method and system based on nano-indentation. The analysis method provided by the present application is performed by combining micro-multiple scale experimental characterization and atomic scale molecular dynamics simulation. Experimental data is obtained through nano-indentation array experiments and multi-source micro-characterization, a heterogeneous molecular dynamics model is constructed, room temperature nano-indentation simulation is performed, gradient temperature is set for high temperature nano-indentation simulation and temperature effect is analyzed, and a corresponding prediction model is constructed, thereby providing micro-basis and a theoretical model for mechanical performance evaluation and prediction of deep shale under a thermal coupling environment.