8 results about "Radial gradient" patented technology

The invention relates to the technical field of acoustic functional devices, and discloses an acoustic black hole lens based on a three-dimensional radial gradient refractive index phonon crystal structure and a design method, a three-dimensional radial gradient refractive index distribution function n (r) with a center convergence characteristic is constructed, and incident sound waves are continuously guided and efficiently focused to the center of the lens in the propagation process; combining the feasibility constraint of an additive manufacturing process, designing a few-negative micro-lattice structure unit for realizing the gradient refractive index distribution, and determining key geometric parameters of the few-negative micro-lattice structure unit; according to the refractive index distribution function n (r), radially arranging the micro-lattice units in a three-dimensional space, and constructing an initial lens model; the sound field distribution, focusing performance and energy convergence efficiency of the model are verified and iteratively optimized in a mode of combining analytical modeling and finite element method simulation, and a three-dimensional radial gradient refractive index photonic crystal acoustic black hole lens design model with wide-angle incidence compatibility and broadband response capability is obtained.

The application relates to the technical field of robots and discloses a health-care service robot interaction method based on sound recognition, which comprises the following steps: fixing a double-ring vector cuff composed of an outer ring and an inner ring at the elbow of a target patient; preprocessing an acoustic and electric signal of the double-ring vector cuff, deducting a baseline acoustic and electric signal, and obtaining an analytic acoustic and electric signal; constructing a sampling value of a boundary complex value function based on the analytic acoustic and electric signal; substituting the boundary complex value function into a boundary integral model of a complex potential acoustic potential to obtain a complex potential acoustic potential of a rotation center of an elbow joint of the target patient; extracting a stress amplitude, a main direction angle and a radial gradient from the complex potential acoustic potential, and respectively determining virtual stiffness, damping and a fractional order based on the stress amplitude, the main direction angle and the radial gradient; generating an output torque by applying a fractional order impedance law based on the virtual stiffness, the damping and the fractional order, and driving a target health-care robot to perform an elbow auxiliary stretching operation based on the output torque.

This invention relates to the field of bearing steel ball defect detection technology, and discloses a method and system for bearing steel ball defect detection combining eddy current and ultrasonic testing. The method includes: first, acquiring the eddy current impedance plane trajectory and ultrasonic A-scan waveform during the continuous rolling process of the bearing steel ball, obtaining preliminary estimates of the eddy current and ultrasonic defect depths respectively, and using these estimates to invert the hardness gradient parameter set of the current bearing steel ball; then, reconstructing the conductivity distribution function and sound velocity distribution function based on the hardness gradient parameter set, performing gradient correction on the preliminary estimates of the eddy current and ultrasonic defect depths to obtain the true defect depth value, and combining this with the designed hardened layer depth to perform a three-level defect classification judgment. This invention can eliminate the dual-modal depth positioning deviation caused by the material radial gradient, achieving high-precision detection and classification judgment of bearing steel ball defect depth.

The application belongs to the technical field of image processing, and particularly relates to a jaw crusher eccentric shaft abnormality detection method and system, which comprises the following steps: S1, an original gray-scale image of a jaw crusher eccentric shaft end face is acquired, the center coordinates of the eccentric shaft end face are determined through circular contour positioning, and the original gray-scale image is converted into a polar coordinate system image with the center coordinates as the origin; S2, the radial gradient and the tangential gradient of each pixel point in the analysis window on the polar coordinate system image are evaluated and analyzed, and the edge response stability index is determined according to the distribution relationship between the radial gradient and the tangential gradient; and S3, the global motion vector of the computer rack background feature points and the local motion vector of the eccentric shaft end face feature region are calculated. The application effectively offsets strong background vibration interference, can identify the trace slip in the budding stage, and significantly improves the safety and monitoring accuracy of equipment operation.

The invention belongs to the technical field of image processing, and particularly relates to a jaw crusher eccentric shaft anomaly detection method and system.The jaw crusher eccentric shaft anomaly detection method comprises the following steps that S1, an original grayscale image of the end face of an eccentric shaft of a jaw crusher is obtained, and the center coordinate of the end face of the eccentric shaft is determined through circular contour positioning; converting the original grayscale image into a polar coordinate system image by taking the central coordinate as an original point; s2, evaluating a radial gradient and a tangential gradient of each pixel point in the analysis window on the polar coordinate system image, and determining an edge response stability index according to a distribution relationship between the radial gradient and the tangential gradient; and S3, calculating a global motion vector of the rack background feature point and a local motion vector of the eccentric shaft end face feature region. According to the invention, strong background vibration interference is effectively counteracted, trace slippage in the germination stage can be identified, and the safety and monitoring precision of equipment operation are significantly improved.

The invention discloses a multifunctional magnetic soft robot based on programmable magnetization and a control method of the multifunctional magnetic soft robot, and relates to the crossing field of intelligent materials and robots. The three-dimensional self-forming structure comprises a structure for realizing rectangular and cylindrical deformation through magnetic moment tangential distribution and a structure for realizing flower-to-lantern deformation through magnetic moment radial gradient; according to the multifunctional magnetic soft robot based on programmable magnetization and the control method thereof, a single robot can achieve switching of multiple forms, and through the magnetic moment tangential distribution design, the robot can be driven by a magnetic field to be curled into a cylinder from a plane rectangle or unfolded into a plane in the reverse direction; by means of radial gradient distribution of magnetic moments, the robot can contract from a petal shape to a lantern shape or reversely expand to restore the initial state, and the robot can adapt to blood vessels or pipelines of different sizes; a single robot realizes multiple functions through magnetic moment programming, the equipment complexity is reduced, and the medical or engineering application cost is reduced.

The invention belongs to the technical field of vortex eliminating structures, and particularly relates to a T-shaped groove tip vortex structure, a pump-jet propeller comprising the T-shaped groove tip vortex structure and a design method of the T-shaped groove tip vortex structure. The T-shaped groove tip vortex structure is composed of an annular groove 1b and rectangular grooves 1a which are evenly formed in the front side of the annular groove 1b in an annular array mode. The bottoms of the rectangular groove 1a and the annular groove 1b are flush, the front and rear side wall surfaces are perpendicular to the rotor shaft, and the left and right side wall surfaces are perpendicular to the bottom surface. The grooves are formed in the inner wall of the guide pipe, so that the tip clearance of the rotor is increased, the radial gradient of the speed is reduced, the radial free vortex becomes dispersed, the speed of discharge flow and the pressure difference between the tip pressure surface and the suction surface are reduced, the strength of tip clearance separation vortex and discharge flow are weakened, fusion of the separation vortex and the discharge flow is weakened, and the strength of the tip vortex is reduced; damage and dissipation effects of the inner wall of the groove on vortexes and discharge flow are achieved; the annular structure at the tail end of the groove prolongs the action interval of the groove on the tip discharge vortex, and finally a good cavitation inhibition effect is achieved.

The invention relates to the technical field of material arranging equipment, and provides a flexible material arranging disc surface treatment and material guiding method which comprises a material arranging rotary disc, a radial gradient composite coating is arranged on the surface of the material arranging rotary disc, and the friction coefficient and the texture density of the radial gradient composite coating are gradually reduced from the center to the edge; according to the method, materials are automatically supplemented through a material supplementing bin when a material arranging rotary disc lacks materials, and the material arranging rotary disc rotates to push the materials to the edge; materials with the height exceeding a set value or overlapped materials are removed through the first screening mechanism, the materials with the minimum radial size posture are reserved through the second screening mechanism, gaps are formed in the circumferential direction through the materials through oblique check blocks, the postures of the materials are judged through the third screening mechanism, qualified materials enter the discharging conveying mechanism through discharging check blocks, and unqualified materials are conveyed back to the material arranging rotary disc through an air blowing electromagnetic valve. And finally, discharging is completed by the discharging conveying mechanism. According to the method, through a multi-stage screening and guiding mechanism, orderly sorting and precise conveying of the materials are achieved, the sorting efficiency and precision are improved, the material collision damage risk is reduced, and material adhesion is reduced.