18results about How to "Avoid calculation errors" patented technology

The invention discloses a driving all-in-one machine and an output shaft multi-turn absolute position detection method thereof, and realizes accurate quantization of a multi-stage coding system state by obtaining a detection value of each stage of coding shaft and decomposing the detection value into a turn value and an in-turn remainder value based on a transmission ratio. A mapping relation from an upper first-level coding axis to a lower first-level coding axis is established according to the transmission ratio, and a mapping value is obtained after dimensions are unified, so that a comparable basis of upper-level coding data and lower-level coding data is established. By obtaining the difference value between the mapping value and the corresponding inner remainder value of the lower first-level coding shaft ring and comparing the difference value with the half-ring threshold value, the phenomenon of zero crossing point asynchronization caused by the gear clearance can be accurately identified. Dynamic compensation is carried out on the number of turns of the next first-level coding shaft based on a difference value comparison result, and reading deviation caused by the mechanical back clearance is effectively corrected. Finally, the multi-turn absolute position of the output shaft is synthesized based on the compensated number of turns of the coding shafts, so that the continuity and accuracy of position calculation are ensured, and position calculation errors caused by gear gaps are avoided.

The application discloses a Brillouin sensing device based on optical parallel differential pulse pairs and a working method, and belongs to the technical field of optical fiber sensing. In view of the problem that the prior art is difficult to consider high resolution, high precision and fast measurement, the device used by the application comprises: an optical source module, which is used to generate an optical carrier; a first optical path module, which is connected with the optical source module and is used to receive the optical carrier and generate optical parallel differential pulse pairs containing anti-Stokes and Stokes components and having different pulse lengths as pump light through double-frequency double-sideband pulse modulation; a second optical path module, which is connected with the optical source module and is used to generate double-sideband probe light; and a sensing optical fiber, which is connected with the first and second optical path modules respectively and is used to receive the pump light and the probe light and directly complete signal differentiation in the optical domain through stimulated Brillouin scattering. Thus, high resolution, high precision and fast measurement are synergistically optimized, the gain / loss mechanism can be flexibly switched, and the scene adaptability is enhanced.

This invention relates to the field of data processing technology and discloses a method, apparatus, and equipment for monitoring surface deformation based on parameter search interval optimization. The method, based on the location information of multiple buildings in a geographic coordinate system and multiple SAR images, determines at least one building-related region and at least one non-building region within a target area. It then determines a first residual elevation search interval for the building-related region based on the roof elevation value of at least one target building within the building-related region; determines a second residual elevation search interval for the non-building region; and performs temporal InSAR phase calculation based on the first residual elevation search interval, the second residual elevation search interval, a preset deformation rate search interval, and multiple SAR images to obtain the surface deformation rate field and residual elevation field of the target area. This significantly improves data processing efficiency while ensuring the accuracy of the temporal InSAR phase calculation and obtaining accurate surface deformation rate and elevation fields.

The invention discloses a method for obtaining the thickness and refractive index of a film, a test system, a storage medium and application. The method for obtaining the thickness and the refractive index of the thin film comprises the following steps: obtaining an intermediate frequency signal carrying transmission phase information by using two groups of nonlinear transmission line terahertz frequency comb generators and a broadband mixer, and obtaining an actually measured phase curve based on the intermediate frequency signal; constructing an equivalent multi-optical-path interference model of the thin film, performing coherent superposition on multiple reflection components of a measured wave signal in the thin film in a complex field to obtain a complex phase of a total transmission field, and obtaining a phase-frequency change spectrum based on the complex phase as a model phase curve; and an error function of the model phase curve and the actually measured phase curve is constructed, and a parameter combination enabling the error function to take the minimum value is solved by scanning the parameter combination of the refractive index n and the thickness d of the thin film. According to the method, thermal drift or time drift of the phase is avoided, and then calculation errors caused by phase jump are avoided.

This invention provides a method and system for evaluating the consistency of multiple / subsequent vessel segmentation results. It involves reading the original data of a vessel dataset and multiple / subsequent vessel segmentation result matrices, then randomly selecting two vessel segmentation result matrices to calculate their union, intersection, and symmetric difference. Any point in the symmetric difference is selected, and iterative growth is performed using a convolution kernel to simulate a path diffusion process. Under the constraints of the union range and a given geodesic distance, a spherical set is obtained. The intersection of this spherical set with the union of the vessel segmentation result matrices and the intersection of this intersection with the two / subsequent vessel segmentation result matrices are calculated. The above calculations and statistical analysis are performed on each point to obtain statistical results, which are then mapped back to the original data and the two / subsequent vessel segmentation result matrices. This yields the statistical results for any two / subsequent vessel segmentation result matrices, and the visualized results are output. This invention can be used to measure the performance of vessel segmentation algorithms or compare their differences, accelerating the development and verification process of vessel segmentation algorithms.

This invention belongs to the field of tire damage resistance testing technology and discloses a method for processing tire compression and cutting force fitting data. The steps are as follows: the tire to be tested is fixed on the loading device and calibrated; a vertical compression force is applied at a constant speed, and force and displacement data from the loading start point to the cord breakage are collected. The fracture node is determined by the sudden change in the force sensor signal; after preprocessing the data, a force-displacement curve is plotted, and linear and rapid growth regions are divided; the breaking energy is obtained by piecewise fitting and integration, thereby evaluating the tire's compression and cutting resistance. This invention adopts a piecewise fitting method for the tire compression and cutting force-displacement curve, and selects an appropriate function model for different stress deformation stages such as elastic deformation and plastic failure, avoiding the calculation error of a single fitting model. It can accurately calculate the tire breaking energy, realize the quantitative evaluation of compression and cutting resistance, and fill the industry gap of no dedicated quantitative evaluation method in the existing technology.

The application provides a pixel information determination method and device, AR glasses and a storage medium, and relates to the technical field of computer vision. The method comprises the following steps: collecting a real-time scanning image in a current visual field range; determining a pixel range of a target object in the real-time scanning image and an included angle between a line of sight direction of the AR glasses and a vertical direction; converting the real-time scanning image into a target image based on the included angle, and determining a target region in the target image; the target image is a top view corresponding to the real-time scanning image; the target region comprises the target object; determining the number of each pixel in the target region within the pixel range and the number of each pixel in the target region. The application can improve the real-time performance and accuracy of pixel information determination.

The application discloses a kind of solid rotor induction motor rotor parameter correction calculation methods, suitable for various capacity smooth solid rotor induction motor.First, according to the characteristics of solid rotor induction motor, the correction coefficient of axial end effect, skin effect, saturation effect and hysteresis effect is given.Then, based on the two-dimensional electromagnetic field theory, the analytical relationship of excitation branch parameters is obtained.Finally, according to the electromagnetic characteristics of solid rotor ferromagnetic material, the analytical relationship of rotor parameters is given respectively, and the method provides a new theoretical method for the design of solid rotor induction motor.

The invention discloses an anti-seepage wall defect evaluation method based on near-field dynamics, and relates to the technical field of anti-seepage engineering safety evaluation. The method comprises the following steps: firstly, establishing a defect-containing diaphragm wall structure model, and defining a mechanical equation, defect boundary conditions and load constraints; dispersing the structure into material points, constructing a key connection relation and deducing a micro-modulus coefficient; then deducing a near-field dynamic power control equation, and setting a key fracture criterion and a damage evolution model; introducing a proportional boundary shape function, converting the power control equation into a matrix form balance equation, and solving a dynamic response; and calculating a damage value, and evaluating the safety performance and the remaining service life of the diaphragm wall in combination with the safety index. The advantages of the near-field dynamics and the proportional boundary finite element method are fused, the evaluation precision and efficiency are considered, and reliable technical support is provided for safety guarantee of the diaphragm wall.

The application discloses a power system dynamic observability calculation method based on a data-driven Koopman operator, belongs to the technical field of power system dynamics and observability analysis, and comprises the following steps: establishing a power system dynamic observability analysis model based on system state variables and measured variables; converting the established dynamic state observability model into an augmented Koopman canonical coordinate system; constructing an observation matrix of the system in the augmented Koopman canonical coordinate system; and calculating the dynamic observability degree of the power system by using a matrix index in the Koopman space. The method of the application uses the data-driven Koopman operator, overcomes the inaccuracy of the model while considering the nonlinear characteristics of the power system dynamic model, effectively solves the low-precision problem of the traditional linear method and the problem of excessive calculation amount of the nonlinear method, and can realize efficient and rapid analysis and calculation of the dynamic observability of the power system.

The invention provides an array antenna pattern optimization method and system based on multi-constraint convex optimization, and relates to the technical field of antenna array optimization, and the method comprises the steps: constructing an array topological structure containing a plurality of candidate array element positions based on initial geometric parameters, and setting a existence variable and an initial phase design variable for each candidate array element position; mapping the existence variable into continuous impedance distribution based on a continuous interpolation function to obtain a pseudo-impedance value; substituting the pseudo-impedance value and the initial phase design variable into a moment method electromagnetic field integral equation, calculating surface current distribution, further calculating main lobe direction radiation energy, side lobe area peak radiation energy and the total number of current array elements, determining a radiation efficiency index based on the radiation energy, and updating the design variable based on a gradient optimization algorithm by taking minimization of a negative value of the radiation efficiency index as a target; judging whether a convergence condition is met or not, if yes, converting into an array element sparse layout scheme and a phase excitation scheme, and generating an optimized array antenna directional diagram; otherwise, continuing iterative optimization.

The utility model discloses a kind of automobile four-wheel alignment gauges, including the mounting bracket of T-shaped structure, four positioning mechanisms, two optical mechanisms and industrial computer, two optical mechanisms are respectively arranged in the one end of mounting bracket horizontal arm and symmetrically arranged in the two sides of mounting bracket longitudinal arm and with industrial computer electric connection, four positioning mechanisms are symmetrically arranged in the two sides of the longitudinal arm, and four positioning mechanisms are all arranged in the inboard of two optical mechanisms.The utility model can ensure that the center of the positioning of four wheels in the automobile repair process always falls in the design center of automobile, optical mechanism and reflecting plate always keep stable and correct relative position, ensure the accuracy of reflected light path and give accurate wheel adjustment suggestion, and can reduce or shield ambient light to the stray light interference of receiving component, avoid light path calculation error, ensure the accuracy of measurement result.

The present application relates to the technical field of three-dimensional modeling, and particularly relates to a lightweight BIM model construction method for urban civil engineering quantity calculation, which solves the technical problem of large engineering quantity calculation error caused by loss of complex region details and data redundancy of simple region due to fixed size downsampling in the prior art. The method comprises the following steps: obtaining a point cloud data set of a urban civil engineering region; determining the neighborhood complexity of each point cloud according to the point cloud data set, and performing region segmentation on the point cloud data according to the neighborhood complexity to obtain a plurality of sub-regions; the neighborhood complexity is used to represent the geometric feature complexity of the surrounding of the point cloud; performing dimension reduction processing on the point cloud data of the sub-region according to the neighborhood complexity of the plurality of point clouds in the sub-region to obtain lightweight point cloud data; and constructing a lightweight building information model of the urban civil engineering region according to the lightweight point cloud data.

This invention discloses an electronic steering system, control method, and grader in the field of electronic steering control technology, aiming to solve the technical problems of poor redundancy and poor safety. It includes: a solenoid valve steering unit and an electronic steering unit (one hydraulic, one electric), which improves the control redundancy of the steering cylinder's steering stroke for the steering signal controller; a hydraulic steering pump and an electric steering pump (one hydraulic, one electric); and an intermediate valve connected to one of them to improve the power redundancy of the electronic steering system. The steering signal controller improves safety by judging the pressure of the intermediate valve and selecting the steering pump. When calculating the target steering angle, the interconnection, signal connection, and control relationship of the solenoid valve steering unit, electronic steering unit, steering signal controller, hydraulic steering pump, electric steering pump, and intermediate valve are interconnected, improving the safety and redundancy of controlling the steering stroke using the steering control device.

This invention discloses a method for calculating cosine effect loss and optimizing output thermal power in solar energy conversion. First, geographical and temporal parameters are obtained to establish a geometric model of the heliostat field. Based on the solar altitude angle, a cosine loss algorithm model is constructed, deriving a formula for calculating cosine efficiency with local latitude, solar declination angle, and solar hour angle as variables, thus achieving dynamic and accurate calculation of cosine loss. On this basis, an objective function is established to maximize the annual average output thermal power per unit mirror area. Considering constraints such as the heliostat's operating status, absorber tower location, installation height and dimensions, center distance, annular radius, and staggered layout, the optimal mirror field layout parameters and operating strategy are solved through year-round time-domain simulation. This invention accurately quantifies cosine loss through analytical algorithms and combines multi-constraint optimization to improve the annual output thermal power of the heliostat field, reduce shading and cosine loss, and provide support for the efficient operation of tower-type solar thermal power generation systems.

This invention discloses a method, apparatus, device, and storage medium for processing driving images. The method includes the following steps: in response to the startup of the vehicle's infotainment system, if it is determined that the current white balance coefficient of the acquired camera is an abnormal value, a white balance anomaly processing strategy is implemented to obtain a target white balance coefficient; based on the target white balance coefficient, the texture value of the current frame image is calculated; based on the verification result of the texture value, it is determined whether the texture value needs to be corrected; if it is determined that the texture value needs to be corrected, image rendering is performed based on the corrected texture value, and the rendered image is output to the vehicle display device. This application significantly improves the color accuracy and stability of the camera output image, effectively avoids the problem of subsequent texture value calculation errors caused by initial white balance coefficient anomalies, and allows for rapid fault location and troubleshooting when problems occur, reducing maintenance costs and improving system maintainability.

The invention discloses a multimode data fusion and dynamic visual target adjustment eye movement detection system and method, and belongs to the technical field of vestibular testing. The method comprises the following steps: collecting multi-modal head sensing data of a user, wherein the multi-modal head sensing data comprises data from at least two types of sensors; inputting the multi-modal head sensing data into an artificial intelligence model for fusion processing, and obtaining head posture data of the user based on a processing result; dynamically updating the position of a visual target on the display equipment according to the head posture data, so that the position of the visual target is synchronously adjusted along with the head movement; synchronously acquiring eye image data of the user; on the basis of the eye image data, iris features are recognized, and an eyeball torsion angle is calculated; and obtaining a detection result for evaluating the vestibular function based on the head posture data and the eyeball torsion angle. According to the invention, full-link anti-interference from physical intervention to algorithm compensation is realized, and the accuracy, stability and repeatability of eye movement parameter measurement in a complex clinical environment are remarkably improved.