5 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.

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.