6 results about "Shape gradient" patented technology

This invention relates to the field of manufacturing large-scale hydraulic engineering irregular-shaped gradient steel pipes, and discloses a method and system for automatically generating the unfolded blanking contour curve of large-scale hydraulic engineering irregular-shaped gradient steel pipes. The method includes: acquiring and discretizing an initial design model; extracting shape operator tensors and binding them to a topological feature set; performing curvature-wall-thickness coupling analytical calculation of the neutral layer offset; translating to generate a feature compensation mesh and extracting the unfolding constraint set; constructing a two-dimensional coordinate system and performing dimensionality reduction and tiling iteration based on the initial coordinate set of the generatrix; determining the two-dimensional coordinates by minimizing the global energy penalty function; and generating the blanking contour curve through smooth curve fitting. This invention solves the problems of geometric interference and accuracy distortion in thick plate forming, achieves accurate restoration of the physical neutral layer and eliminates the need for secondary fitting, and improves the manufacturing accuracy and efficiency of large-scale hydraulic engineering components.

The application provides a visual detection method, system and edge computing box. The surface image of a target product is subjected to multi-scale edge detection to generate edge feature maps of different scales. A defect area candidate frame of the surface of the target product is determined according to all the edge feature maps, and the gradient variance of pixels in each edge feature map is determined. The positioning loss of the surface defects of the target product is determined according to the defect area candidate frame and all the gradient variances, and the contour shape gradient of each type of defect on the surface of the target product is determined based on the positioning loss and the fluctuation characteristics of the light intensity around the production line. The influence level of the surface defects of the target product on the target product is determined through the contour shape gradient of each type of defect, and a graded alarm signal of the surface defects of the target product is output based on the influence level. The application can realize dynamic grading alarm of products based on the geometric topological characteristics of product defects.

The invention relates to the technical field of robot control, in particular to a humanoid robot shuttlecock return control system based on a multi-stage training model, which comprises the steps of collecting a shuttlecock flying image, extracting a skirt windward area change rate as a morphological gradient, entering an overturning stage when a bell-shaped curve characteristic is presented, dynamically expanding a noise covariance matrix, and performing training. Smoothly adjusting the resistance coefficient, and outputting the ball hitting point coordinate and the arrival time; obtaining the motor temperature of each joint in combination with the ball hitting point coordinate and calculating a thermal urgency degree index; constructing a null space projection matrix based on the Jacobian matrix, generating a thermal rejection velocity vector, projecting the thermal rejection velocity vector to a null space, reconstructing a joint angle, and outputting a joint instruction sequence; the arrival time is used as a trigger source, the joint position ring stiffness is adjusted in a time window before ball hitting, and the speed ring damping coefficient is adjusted according to the critical damping condition; and estimating a ball hitting reaction force vector, controlling and guiding the backward movement generated by the reaction force by using anisotropic admittance, and linking a return action.

The application discloses a liquid crystal screen defect detection method and system, and relates to the technical field of defect detection. The method collects optical field data, physical data and imaging data of a liquid crystal screen, constructs a double-grid system, generates a spatial variation viscosity coefficient field by using a texture entropy field, identifies a physical pixel grid structure of a fine grid, constructs and solves a discrete variation boundary correction equation, generates a gradient compensation field, constructs and solves a discrete variation boundary correction equation based on a physical sub-pixel topological structure, generates a gradient compensation field to eliminate inherent gradient interference caused by a physical grid, constructs a target energy functional containing a viscosity control item and a gradient compensation boundary, calculates a shape gradient tensor and a sensitivity field, and performs joint detection of coarse grid global positioning mapping to fine grid local screening. The application effectively solves the signal interference problem in a high-frequency physical texture background, and significantly improves the detection precision, edge segmentation quality and robustness of micron-level defects in a complex background.

The invention relates to an FSDT-based pyramid type gradient dot matrix sandwich panel vibration characteristic forecasting method. The method comprises the following steps: S1, calculating equivalent material attributes of a gradient dot matrix core material according to stress characteristics of pyramid type gradient dot matrix unit cells; s2, establishing a first-order shear deformation displacement field, and obtaining strain energy, elastic potential energy and kinetic energy of the pyramid-shaped gradient lattice sandwich panel in combination with a geometric equation and a constitutive relation; and S3, an allowable displacement variable meeting any boundary condition is established, the characteristic value equation is solved in combination with the Lagrange equation and the Ritz method, and the vibration frequency and mode of the pyramid type gradient dot matrix sandwich panel are determined. According to the method, a gradient dot matrix equivalent material attribute calculation method and a first-order shear deformation theory are applied to prediction analysis of the vibration characteristics of the pyramid type gradient dot matrix sandwich panel, and a more accurate and efficient vibration characteristic analysis result can be provided for the pyramid type gradient dot matrix sandwich panel.

The application provides a high-light rendering method and device of a model and electronic equipment, and the initial high-light parameter of a target model is calculated through a preset light model; a shape gradient parameter of the target model is acquired; the shape gradient parameter represents the relative positions between each vertex of the target model; the initial high-light parameter is adjusted based on the shape gradient parameter to obtain the high-light parameter of the target model; and the target model is rendered based on the high-light parameter. The rendering effect of the high light is ensured to be roughly consistent with the anisotropic rule, the rendering effect has a certain painting style, the effect requirement of the non-real rendering scene is met, and the rendering efficiency of the high light is improved.